СТАБИЛИЗИРОВАННЫЕ ЧАСТИЦЫ ГИПСА

Изобретение относится к способам получения строительных химических композиций для получения гипсовых изделий, содержащих мелкодисперсный сульфат кальция. Предложен способ получения строительной химической композиции, содержащей мелкодисперсный сульфат кальция с размером частиц менее 10,0 мкм, и диспергирующее вещество, представляющее собой простой полиариловый эфир, включающий стадии обеспечения суспензии, содержащей указанные частицы сульфата кальция с размером, равным или выше 10,0 мкм, воду и указанное диспергирующее вещество, и мокрое измельчение полученной пастообразной смеси, причем соотношение массы мелкодисперсных частиц и массы диспергирующего вещества находится в диапазоне 0,1:99,9 – 99,9:0,1. Предложено также применение простого полиарилового эфира в качестве диспергирующего вещества в процессе мокрого измельчения для получения мелкодисперсных частиц сульфата кальция. Предложенный способ позволяет получить строительную химическую композицию, стабильную при хранении, которая может ...

УСКОРИТЕЛЬ СХВАТЫВАНИЯ ДЛЯ ГИДРАТАЦИИ ГИПСА

... 1. Суспензия гипса, содержащая:полугидрат сульфата кальция;и суспензию измельченного брушита и воды.2. Суспензия гипса по п.1, отличающаяся тем, что указанная суспензия брушита выдержана более 24 часов.3. Суспензия гипса по п.1, отличающаяся тем, что указанная суспензия гипса содержит по меньшей мере один дополнительный ускоритель или замедлитель скорости гидратации.4. Суспензия гипса по п.1, отличающаяся тем, что указанный измельченный брушит не имеет покрытия.5. Суспензия гипса по п.1, отличающаяся тем, что указанная измельченная суспензия брушита присутствует в количествах от примерно 0,015% до примерно 2% по массе сухого брушита в пересчете на массу полугидрата сульфата кальция.6. Гипсовый продукт, содержащий:матрицу кристаллов дигидрата сульфата кальция с измельченными кристаллами брушита, распределенными в указанной матрице.7. Продукт по п.6, отличающийся тем, что указанная измельченная суспензия брушита присутствует в количествах от примерно 0,015% до примерно 2% по массе сухого ...

Continuous mfr. of fibre-reinforced plasterboard - using waste paper fibres by=prod. gypsum of controlled particle size and density

Continuous mfr. of fibre-reinforced plasterboard from plaster of Paris and reinforcement fibres by a single-stage filtration process. A dilute slurry of gypsum and lignocellulose-contg. fibres is distributed, opt. with additives, on a water-permeable conveyor belt. The excess water is removed by reduced suction to form a filter cake, which is further dewatered by mechanical pressure, stored until it sets and finally dried by heating. Gypsum with an apparent density greater than 950 g/l is used if the gypsum is the alpha-hemihydrate, or greater than 700 g/l in the case of the beta-hemihydrate. The gypsum particle size distribution in aq. suspension has a gradient of more than 40 deg. in the RS particle distribution diagram. USE/ADVANTAGE - Used for mfg. sandwich-type plasterboard or structural board, and is a unique combination of various process stages which overcome the disadvantages of the conventional wet and dry-screen processes, producing good quality plasterboard at high outputet ...

TREATING CALCIUM SULPHATE

... 1385757 Treating calcium sulphate GIULINI GmbH Gebr 13 Sept 1972 [15 Sept 1971] 42570/72 Heading C1A -Calcium sulphate hemihydrate is obtained from a suspension of the same by continuously filtering the suspension through a pressure filter at a pressure of 0À5 to 2 atm. gauge and a temperature above the hemihydrate-dihydrate transition point and washing the filtered material with water at a temperature above 50‹ C. and a pressure greater than atmospheric. The wash water temperature is suitably from 85‹ to 105‹ C. and used in an amount 0À1 to 51. per kg. The washed hemihydrate may be mixed with water, ground and the pH is then adjusted to 4À5 to 4À8 by the addition of sulphuric acid.

Gypsum plasterboard comprising s-triazine-crosslinked starch

Gypsum plasterboard comprising cross-linked starch

A formulation for making plasterboard with paper cover sheets comprises finely divided gypsum, a minor amount by weight of starch and, as crosslinking agent for the starch, a tri-functional reactive s-triazine having substituents at positions 2, 4 and 6 of the triazine ring which are reactive with the starch. A preferred crosslinking agent is 2,4,6-trichloros-triazine, which is preferably partially reacted with the starch before further reaction with the paper cover sheets for the plaster board. The cross linking of the starch increases strength and improves adhesion to the paper cover sheets.

Process and plant for the heat treatment of fine-grained mineral solids

In the heat treatment of fine-grained mineral solids, in particular for calcining clay or gypsum, the solids are passed through a flash reactor (5), in which they are contacted with hot gases at a temperature of 450 to 1500°C, and subsequently they are passed through a residence time reactor (7) at a temperature of 550 to 800°C, from which they are withdrawn after a residence time of 1 to 600 minutes and possibly supplied to a further treatment stage.

DRIED GYPSUM ARTICLES HAVING STRENGTH TO DENSITY RATIO

... 1328066 Gypsum articles UNITED STATES GYPSUM CO 25 Jan 1972 3425/72 Heading B5A Gypsum articles are cast from gypsum having a particle size of under 32 Á. Particles of this size may be collected by an air classifier or sieve acting on ground gypsum before or after calcining. The particle size is preferably within the range 6-16 Á. Additives that may be incorporated into the slurry include an accelerator, e.g. freshly ground cast gypsum block or potassium sulphate, a cereal binding grain agent, e.g. starch, a filler, e.g. paper or cellulose fibre, a dispersing agent, e.g. ammonium lignosulphonate containing wood sugars, and a foam. The gypsum hemihydrate may be calcined in kettles, rotary calciners, indirectly heated conveyers, air swept directly heated mills, and, fluid bed calciners. Articles which may be formed include paper-covered plasterboard, bath partition tile, roof plank, floor tile and roof decks poured from job-mixed concretes.

Improvements in or relating to cementitious material

A cementitious material comprises cellular granules of soluble anhydrite and/or calcium sulphate hemi-hydrate. An aggregate e.g. expanded perlite, exfoliated vermiculite, pumice, fly ash or their mixtures may be present, together with retarders and accelerators. The material is made by, in any order, comminuting, drying and calcining a foamed gypsum plaster, the calcining making the product cementitious. The foam may contain up to 3% of slaked or quick lime or up to 5% of Portland cement; up to 3% of alum, borax, calcium chloride, ammonium or aluminium sulphate, gum arabic, graphite, mica or sulphite lye or combinations thereof.

CONSTRUCTION PANEL HAVING IMRPOVED FIXING STRENGTHAND METHOD FOR THE MANUFACTURE THEREOF

CONSTRUCTION PANEL HAVING IMRPOVED FIXING STRENGTHAND METHOD FOR THE MANUFACTURE THEREOF

Gypsum for preparation of anhydrite binders.

CONSTRUCTION PANEL HAVING IMRPOVED FIXING STRENGTHAND METHOD FOR THE MANUFACTURE THEREOF

VERFAHREN ZUM BEHANDELN VON GIPS, INSBESONDERE FUER DIE HERSTELLUNBG VON ANHYDRITBINDERN

VERFAHREN ZUM BEHANDELN VON GIPS BEI DER HERSTELLUNG VON GIPSPLATTEN

PROCEDURE FOR THE PRODUCTION OF FASERHALTIGEN SOLIDIUMS

PROCEDURE FOR SEPARATION OF ALPHA CALCIUM SULFATE HEMIHYDRATE FROM A SUSPENSION AND A SUBSEQUENT TREATMENT OF THE HEMIHYDRATE TOO GIPSKORPERN OR POWDER GYPSUM

PROCEDURE FOR TREATING GYPSUM WITH THE PRODUCTION OF GIPSPLATTEN

PROCEDURE FOR THE PRODUCTION OF STABILIZED TIE-ABLE CALCIUM SULFATE BY CONVERSION OF RAW PHOSPHATE WITH SULFURIC ACID

EQUIPMENT FOR DRYING AIR AFTER THE KONDEN SATIONSVERFAHREN

GERAET ZUM TROCKNEN VON LUFT NACHDEM KONDEN- SATIONSVERFAHREN

CALCINATION OF GYPSUM

Improved gypsum-containing products containing alpha-hemihydrate

Chemical additive for gypsum products

Unitalen Ref: OP1312-08-0767 Client Ref.: P2012/63-AU PCT_Original The present invention provides a gypsum composition, a gypsum board and their preparation method and the use of DHA as an anti-sagging additive in a gypsum product. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises gypsum, and an anti-deformation additive, wherein the anti-deformation additive comprises at least one selected from a group consisting of dehydroascorbic acid, dehydroascorbate and semidehydroascorbic acid. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum product of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum product to meet the demands of the customer. -11- ...

PREPARING CALCINED GYPSUM AND GYPSUM BOARD

GYPSUM FORMULATIONS

A gypsum formulation, typically for producing a gypsum building board, is produced by adding to an aqueous gypsum slurry containing a water swellable clay, acomb- based copolymer fluidiser and a basic water-soluble polymer having pref-erential affinity for clay, and allowing a layer of theaqueous gypsum slurry to set.

GYPSUM COMPOSITIONS WITH ENHANCED RESISTANCE TO PERMANENT DEFORMATION

A set of gypsum-containing composition is disclosed. In one aspect, the set gypsum-containing composition includes an interlocking matrix of the set gypsum formed from at least calcined gypsum, water, and an enhancing material. The enhancing material can be selected from (i) an organic polyphosphonic compound, or a mixture thereof; (ii) a borate selected from ulexite colemanite, or a mixxture thereof; of a mixture of (i) and (ii). In another aspect, the set gypsum-containing composition is treated with an enhancing material which can be selected from (i) an organic phosphonic compound or a mixture thereof; (ii) a borate selected from ulexite, colemanite, or a mixture thereof; (iii) a carboxylic compound or a mixture thereof; or a mixture of (i), (ii) and/or (iii).

CALCINING CALCIUM SULPHATE DIHYDRATE

Method and apparatus for the continuous calcination of calcium sulphate dihydrate (gypsum) to hemihydrate plaster by heating A bed of gypsum in a kettle to the required calcination temperature at least in part by means of hot gas continuously introduced into the bed, moisture (e.g. in the form of water droplets or steam) being sprayed into the gaseous phase (e.g. into the hot gas before contact with the bed and/or into exhaust gas above the bed) to reduce the degree of production of insoluble anhydrite.

METHOD OF PRODUCING FIBRE-CONTAINING BUILDING MEMBERS

This invention relates to the production of building members and, in particular to the production of plates. The member is produced by forming a mixture of a fibrous substance with a sulfatic binding agent and an amount of water which is a multiple of the amount of water necessary to set the binding agent. The main amount of excess water is removed from the fleece mechanically before the setting process begins, the mould is shaped and subsequently dried. The process is characterized in that the sulfatic binding agent is a calcium sulfate hemihydrate in which the specific surface area of the particles, in the aqueous suspension, does not alter or alters only to an unsubstantial amount until the main amount of excess water is removed mechanically from the fleece.

ALKALI-O2 OXIDIZED LIGNIN AS DISPERSANT

According to an example aspect of the present invention, there is provided a dispersant comprising alkaline-O2 oxidized lignin. Such dispersant may be used for example in inorganic pigments to reduce interactions between pigment particles and lower the viscosity of pigment mixtures, and thereby positively affect for example to the loading of fillers and pigments in paints and coatings,paper and board, constructions materials, printing inks and plastics. Dispersants may also be used in aiding the inorganic pigment grinding in the pigment mine. Another suitable use is as a plasticizer or as a retardant agent for construction materials, such as gypsum.

HIGH STARCH LIGHT WEIGHT GYPSUM WALLBOARD

... ²²²The invention generally provides gypsum-containing slurries including stucco, ²naphthalenesulfonate dispersant, and pregelatinized starch. The ²naphthalenesulfonate dispersant is present in an amount of about 0.1% - 3.0% ²by weight based on the weight of dry stucco. The pregelatinized starch is ²present in an amount of at least about 0.5% by weight up to about 10% by ²weight of pregelatinized starch by weight based on the weight of dry stucco in ²the formulation. Other slurry additives can include trimetaphosphate salts, ²accelerators, binders, paper fiber, glass fiber, and other known ingredients. ²The invention also comprises the gypsum-containing products made with such ²slurries, for example, gypsum wallboard, and a method of making gypsum ²wallboard.² ...

COMPOSITIONS WITH SYNTHETIC GYPSUM AND METHODS

DTPA-coated synthetic calcined gypsum is provided with alpha-like properties and obtained by spray-coating the synthetic caclined gypsum with DTPA. Cementitious compositions comprising DTPA-coated synthetic calcined gypsum and low water demand are provided as well. Methods for controlling an open time of a cementitious slurry by increasing or decreasing the amount of DTPA-coated synthetic calcined gypsum in the slurry are provided as well.

AQUEOUS ASPHALT/WAX EMULSIONS FOR USE IN GYPSUM COMPOSITIONS AND BUILDING PRODUCTS

Aqueous asphalt/wax emulsions are disclosed herein for use in gypsum formulations and other building products. The emulsions may include water; a wax component; an asphalt component; and at least one emulsifier. Optional additives may also be included in the emulsion or in a slurry formed from such emulsion for preparing a settable gypsum composition herein. Methods of making such emulsions are also provided.

Procédé pour fabriquer un ciment.

Procédé de traitement du plâtre en vue d'obtenir un produit stable et ne collant pas après gâchage.

Verfahren zur Herstellung eines erhärtbaren Baumaterials.

Verfahren zur Herstellung poröser Gipsmassen und Bauelemente.

Wasserlöslichen Anhydrit und/oder Calciumsulfat-hemihydrat enthaltendes, hydraulisch abbindendes Produkt und Verfahren zu dessen Herstellung

Process for producing fibre-containing building components

Fibre-containing building components are produced by forming a mat from mixtures of fibrous substances with sulphate-type binders and water. The quantity of water is here many times greater than that required for setting of the sulphate-type binders. The major quantity of the excess water is mechanically removed from the mat before the start of the setting process, and the mat is formed to give a moulding which is dried after setting. The essential point is that a calcium sulphate hemihydrate is used as the sulphate-type binder. Its specific particle surface area changes only insignificantly in the aqueous suspension, or not at all, until the major quantity of the excess water has been removed mechanically from the mat. The novel process makes it possible to improve the output capacity of the winding-roll machines used in the manufacture of plasterboard, and to work with Fourdrinier machines, using sulphate-type binders.

Cement-containing building material

BUILDING MATERIAL MIXTURE WITH CALCIUM SULFATE HEMIHYDRATE AND SAND AS WELL AS FURTHER ADDITIVES.

GYPSUM COMPOSITION, GYPSUM SLURRY, GYPSUM HARDENED BODY, GYPSUM-BASED CONSTRUCTION MATERIAL, GYPSUM BOARD, AND METHOD FOR PRODUCING GYPSUM-BASED CONSTRUCTION MATERIAL

Placa de gesso leve e método de fabricação

Gypsum-based building products and method for the manufacture thereof

A building product comprises calcium sulphate dihydrate particles bound by an organic binder. The calcium sulphate dihydrate particles each have a longest dimension and a lateral dimension, wherein the lateral dimension corresponds to the maximum breadth of the particle about the axis defined by the longest dimension. The calcium sulphate dihydrate particles have a low aspect ratio such that for at least 75% of the calcium sulphate dihydrate particles, the value of the lateral dimension is at least 20% of the value of the longest dimension.

Emulsion de ceras acuosa que comprende un hidrocarburo parafinico y un componente de cera olefinica sintetica; composicion de yeso fraguable que comprende a dicha emulsion; tablero de yeso; metodo para fabricar un tablero de yeso resistente al agua; y sustituto de cera montana.

Emulsión de ceras acuosa que comprende agua, hidrocarburo parafínico y componente de cera seleccionada de I) Cera alfa-olefínica normal sintética, II) Cera olefínica sintética c20 o más modificada por oxidación y/o refinamiento y/o destilación o agotamiento; composición de yeso fraguable, método para fabricar tablero de yeso; y sustituto de cera.

WET-GRINDING GYPSUM WITH POLYCARBOXYLATES

The process of the present invention includes obtaining a feed material having an initial median particle size A solution of a polycarboxylate dispersant in water is formed, then the feed material is added to the solution to form a slurry The slurry is wet-ground to reduce the median particle size of the feed material Optionally, the total amount of polycarboxylate dispersant is divided into a plurality of doses that are added periodically over the total grinding time ...

SYSTEMS AND METHODS FOR AFFECTING A WALL REPAIR

A repair plaster powder for repairing drywall. The repair plaster powder includes gypsum plaster and crystalline silica. The repair plaster powder also includes calcium carbonate and calcium hydroxide. 1. A repair plaster powder for repairing drywall , the repair plaster powder comprising:gypsum plaster;crystalline silica;calcium carbonate; andcalcium hydroxide.2. The repair plaster powder of claim 1 , wherein the gypsum plaster is approximately 75 percent of the repair plaster powder by weight.3. The repair plaster powder of claim 1 , wherein the crystalline silica is approximately 10 percent of the repair plaster powder by weight.4. The repair plaster powder of claim 1 , wherein the calcium carbonate is approximately 10 percent of the repair plaster powder by weight.5. The repair plaster powder of claim 1 , wherein the calcium hydroxide is approximately 5 percent of the repair plaster powder by weight.6. The system of claim 1 , wherein the repair plaster powder further includes:kaolin.7. The repair plaster powder of claim 6 , wherein the kaolin is approximately 0.5 percent of the repair plaster powder by weight.8. The system of claim 1 , wherein the repair plaster powder further includes:hydroxypropyl methyl cellulose.9. The repair plaster powder of claim 6 , wherein the hydroxypropyl methyl cellulose is approximately 0.02 percent of the repair plaster powder by weight.10. The system of claim 1 , wherein the repair plaster powder further includes:ethylene vinyl acetate.11. The repair plaster powder of claim 6 , wherein the ethylene vinyl acetate is approximately 0.04 percent of the repair plaster powder by weight.12. The system of claim 1 , wherein the repair plaster powder further includes:carboxymethylcellulose.13. The repair plaster powder of claim 6 , wherein the carboxymethylcellulose is approximately 0.5 percent of the repair plaster powder by weight.14. The system of claim 1 , wherein the repair plaster powder further includes:stabilizing agents.15. A kit ...

Construction Panel Having Improved Fixing Strength and Method for the Manufacture Thereof

A plasterboard comprises a gypsum matrix having fibres embedded therein. The plasterboard optionally has a backing lamina attached to one of the faces thereof. The gypsum matrix of the plasterboard optionally comprises a polymeric additive.

Gypsum panels, systems, and methods

Gypsum panels, sheathing systems, and methods of making and using the same are provided. A gypsum panel includes a gypsum core associated with a first fiberglass mat having a continuous barrier coating, the coating penetrating a portion of the first fiberglass mat opposite the gypsum core, wherein gypsum penetrates a remaining fibrous portion of the first fiberglass mat such that voids in the first fiberglass mat are substantially eliminated. A building sheathing system includes at least two gypsum panels and a seaming component to provide a seam at an interface between the gypsum panels.

Dental gypsum powder

An embodiment according to the present invention provides a dental gypsum powder including a hemihydrate gypsum and a water-reducing agent, wherein the mass ratio of the water-reducing agent to the hemihydrate gypsum is 0.1 to 1%, the content of particles having a particle diameter of 10 μm or less is 15 to 35 volume %, the content of particles having a particle diameter of 20 μm or less is 40 to 55 volume %, and the content of particles having a particle diameter of 30 μm or less is 55 to 75 volume %.

セメントクリンカーの製造方法

ЛЕГКАЯ ГИПСОВАЯ ОБЛИЦОВОЧНАЯ ПЛИТА С ВЫСОКИМ СОДЕРЖАНИЕМ КРАХМАЛА

FIELD: chemistry. SUBSTANCE: invention relates to a method of preparing gypsum suspensions, as well as to making articles from said suspensions. The invention discloses gypsum-containing suspensions which contain gypsum plaster, naphthalene sulphonate dispersing agent and pre-gelled starch. The naphthalene sulphonate dispersing agent is present in amount of at least approximately 0.58% of the mass of the gypsum plaster. The pre-gelled starch is present in amount of at least approximately 0.5-10% of the mass of the dry gypsum plaster in the mixture. The suspension can contain other additives, including trimethaphosphate salts, catalysts, binding materials, lint, glass fibre and other known ingredients. The invention also discloses gypsum-containing products made from such suspensions, e.g. gypsum facing slabs, and a method of making gypsum facing slabs. The invention is developed in subclaims. EFFECT: high strength of strength of the gypsum plate. 22 cl, 6 tbl, 6 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 414 440 (13) C2 (51) МПК C04B 11/00 (2006.01) E04F 13/02 (2006.01) B32B 13/08 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2007145428/03, 08.06.2006 (24) Дата начала отсчета срока действия патента: 08.06.2006 (73) Патентообладатель(и): ЮНАЙТЕД СТЭЙТС ДЖИПСУМ КОМПАНИ (US) 2 4 1 4 4 4 0 (43) Дата публикации заявки: 20.07.2009 Бюл. № 20 2 4 1 4 4 4 0 R U (56) Список документов, цитированных в отчете о поиске: US 6342284 B1, 29.01.2002. SU 885178 A, 30.11.1981. SU 887506 A, 07.12.1981. RU 97106835 A, 20.05.1999. SU 1100264 A, 30.06.1984. К.В.МИХАЙЛОВ. Справочник по производству сборных железобетонных изделий. - М.: Стройиздат, 1982, с.42, 44. C 2 C 2 (45) Опубликовано: 20.03.2011 Бюл. № 8 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 09.01.2008 (86) Заявка PCT: US 2006/022371 (08.06.2006) (87) Публикация заявки РСТ: WO 2006/135707 (21.12.2006) Адрес для ...

СТРОИТЕЛЬНЫЕ ПРОДУКТЫ НА ОСНОВЕ ГИПСА И СПОСОБ ИХ ПРОИЗВОДСТВА

Изобретение относится к строительному продукту, представляющему собой самонесущую конструкцию, включающему частицы дигидрата сульфата кальция, связанные органическим связующим компонентом. Каждая из частиц дигидрата сульфата кальция имеет наиболее длинный размер и поперечный размер, в которых поперечный размер соответствует максимальной ширине частицы по оси, определяющей наиболее длинный размер. Частицы дигидрата сульфата кальция имеют низкое аспектное отношение, такое что для по меньшей мере 75% частиц дигидрата сульфата кальция величина поперечного размера составляет по меньшей мере 20% величины наибольшего размера и частицы дигидрата сульфата кальция имеют размер Dболее чем 3 мкм и менее чем 2 мм. В варианте строительный продукт содержит частицы дигидрата сульфата кальция, для которых 90 вес.% частиц имеют размер от 1 мкм до 3 мм. Изобретение относится также к способу изготовления строительной конструкции и к строительному продукту. Изобретение развито в зависимых пунктах формулы изобретения ...

ОРГАНОМИНЕРАЛЬНЫЙ МОДИФИКАТОР ДЛЯ ГИПСОВЫХ СМЕСЕЙ И РАДИОЗАЩИТНЫХ ИЗДЕЛИЙ НА ИХ ОСНОВЕ

Изобретение относится к области строительных материалов, а именно к добавкам, используемым при изготовлении гипсовых смесей и изделий на их основе с радиозащитными свойствами. Технический результат - получение органоминерального модификатора для гипсовых смесей на основе низкомарочного полуводного гипса, позволяющего увеличить пределы прочности при сжатии и водостойкость изделий на их основе, а также придать им радиозащитные свойства. Кроме того, разрабатываемый органоминеральный модификатор позволит создавать самоуплотняющиеся смеси и применять полусухой метод производства изделий на основе гипсового вяжущего с литьевым способом их формования. Повышение физико-механических характеристик изделий на основе гипсовых вяжущих, таких как пределы прочности при сжатии и водостойкость, а также придание им радиозащитных свойств позволит значительно расширить область их применения, в том числе для защиты от электромагнитных излучений. Органоминеральный модификатор для гипсовых смесей и радиозащитных ...

УСТРОЙСТВО И СПОСОБ ДЛЯ СМЕШИВАНИЯ И ПЕРЕМЕШИВАНИЯ, И СПОСОБ ИЗГОТОВЛЕНИЯ ЛЕГКОВЕСНОЙ ГИПСОВОЙ ПЛИТЫ

... [ЦЕЛЬ] Вращательное движение гипсового раствора, разливаемого на лист бумаги для покрытия гипсовой плиты, ограничивают для предотвращения возникновения неправильного распределения, отклонения или нерегулярного распределения при распределении плотности раствора на листе бумаги. [РЕШЕНИЕ] Устройство (10) смешивания и перемешивания для гипсового раствора имеет круглый корпус (20), формирующий область смешивания, вращающийся диск (32), расположенный в корпусе, и трубчатый канал (50, 90, 95, 96, 97, 97') для подачи раствора на лист бумаги для покрытия (1) гипсовой плиты. Желоб имеет участок (60, 61, 91, 92) канала текучей среды, и его поперечное сечение выполнено неосесимметричным относительно центральной оси (C, C1) трубчатого канала, или участок(98,99) канала для текучей среды изменяет положение центральной оси трубчатого канала в результате изменения или латерализации поперечного сечения канала для текучей среды. Осесимметричный вихревой поток, генерируемый в трубчатом канале в виде закрученного ...

ГИПСОВАЯ КОМПОЗИЦИЯ, ГИПСОВАЯ СУСПЕНЗИЯ, ГИПСОВОЕ ЗАТВЕРДЕВШЕЕ ТЕЛО, СТРОИТЕЛЬНЫЙ МАТЕРИАЛ НА ГИПСОВОЙ ОСНОВЕ, ГИПСОВАЯ ПЛИТА И СПОСОБ ИЗГОТОВЛЕНИЯ СТРОИТЕЛЬНОГО МАТЕРИАЛА НА ГИПСОВОЙ ОСНОВЕ

Изобретение относится к гипсовой композиции, гипсовой суспензии, гипсовому затвердевшему телу, строительному материалу на гипсовой основе, гипсовой плите и способу изготовления строительного материала на гипсовой основе. Технический результат- получение гипсового затвердевшего тела с высокой прочностью без значительного увеличения количества добавленной воды при получении гипсовой суспензии. Средство решения проблемы: предоставлены гипсовая композиция, гипсовая суспензия, гипсовое затвердевшее тело, строительный материал на гипсовой основе, гипсовая плита и способ изготовления строительного материала на гипсовой основе так, что в них включены обожженный гипс и фосфат крахмала-мочевины. 4 н. и 2 з.п. ф-лы, 6 табл., 4 ил.

Patent RU2018102152A3

7 ВУ’ ” 2018102152” АЗ Дата публикации: 18.11.2019 Форма № 18 ИЗ, ПМ-2011 Федеральная служба по интеллектуальной собственности Федеральное государственное бюджетное учреждение 5 «Федеральный институт промышленной собственности» (ФИПС) ОТЧЕТ О ПОИСКЕ 1. . ИДЕНТИФИКАЦИЯ ЗАЯВКИ Регистрационный номер Дата подачи 2018102152/03(002902) 22.06.2016 РСТ/О$2016/038737 22.06.2016 Приоритет установлен по дате: [ ] подачи заявки [ ] поступления дополнительных материалов от [ ] приоритета к ранее поданной заявке № по первоначальной заявке № из которой данная заявка выделена [ ] подачи первоначальной заявки № из которой данная заявка выделена [ ] подачи ранее поданной заявки № [Х] подачи первой(ых) заявки(ок) в государстве-участнике Парижской конвенции (31) Номер первой(ых) заявки(ок) (32) Дата подачи первой(ых) заявки(ок) (33) Код страны 1. 62/184,060 24.06.2015 05 2. 62/290,361 02.02.2016 05 3. 15/186,176 17.06.2016 05 4. 15/186,212 17.06.2016 05 5. 15/186,232 17.06.2016 05 6. 15/186,257 17.06.2016 05 Название изобретения (полезной модели): [Х] - как заявлено; [ ] - уточненное (см. Примечания) КОМПОЗИТНАЯ ГИПСОВАЯ ПЛИТА И СПОСОБ ЕЁ ИЗГОТОВЛЕНИЯ Заявитель: ЮНАЙТЕД СТЕЙТС ДЖИПСУМ КОМПАНИ, 0$ 2. ЕДИНСТВО ИЗОБРЕТЕНИЯ [Х] соблюдено [ ] не соблюдено. Пояснения: см. Примечания 3. ФОРМУЛА ИЗОБРЕТЕНИЯ: [Х] приняты во внимание все пункты (см. Примечания) [ ] приняты во внимание следующие пункты: [ ] принята во внимание измененная формула изобретения (см. Примечания) 4. КЛАССИФИКАЦИЯ ОБЪЕКТА ИЗОБРЕТЕНИЯ (ПОЛЕЗНОЙ МОДЕЛИ) (Указываются индексы МПК и индикатор текущей версии) ЕО4С 2/04 (2006.01) В32В 7/02 (2006.01) СОЗВ 28/14 (2006.01) СО4В 111/20 (2006.01) 5. ОБЛАСТЬ ПОИСКА 5.1 Проверенный минимум документации РСТ (указывается индексами МПК) Е04С2/04, В3З2В 7/02, С04В28/14, С04В 111/20 5.2 Другая проверенная документация в той мере, в какой она включена в поисковые подборки: 5.3 Электронные базы данных, использованные при поиске (название базы, и если, возможно, поисковые термины): 6. ...

СПОСОБ ИЗГОТОВЛЕНИЯ СТРОИТЕЛЬНЫХ МАТЕРИАЛОВ

Изобретение относится к химической технологии переработки гипсосодержащего сырья и техногенных отходов, в частности к способам получения гипсового вяжущего из борогипса, и может быть использовано в области производства строительных материалов. Технический результат заключается в повышении технологичности изготовления строительных материалов на основе гипсосодержащих отходов производства (борогипса) и улучшении прочностных характеристик получаемого материала. Способ изготовления включает сушку и смешение гипсосодержащего компонента с наполнителем, в качестве гипсосодержащего компонента используется борогипс, измельченный в шаровой мельнице и активированный сушкой с перемешиванием при 210-230°С, затем готовится композиция состава, мас.%: борогипс 85-92,5, натриевая соль карбоксиметилцеллюлозы 7,5-15 и вода 6 (сверх 100 мас.%), после чего заготовку выдерживают под давлением и высушивают. 2 табл.

АКУСТИЧЕСКАЯ ПАНЕЛЬ С ПОНИЖЕННЫМ ПЫЛЕОБРАЗОВАНИЕМ

... 1. Акустическая панель, включающая акустический слой, содержащий взаимосвязанную матрицу из дигидрата сульфата кальция, снижающий пыление агент и по меньшей мере один компонент из группы, состоящей из волокон, легковесного заполнителя и их смесей, где в указанной взаимосвязанной матрице сформированы полости для поглощения звука и где указанный снижающий пыление агент выбран так, чтобы агломерировать пыли при температурах, возникающих вследствие трения при резании панели. ! 2. Панель по п.1, в которой указанный снижающий пыление агент имеет температуру плавления менее 55°С. ! 3. Панель по п.1, в которой указанные волокна включают бумагу. ! 4. Панель по п.1, в которой указанный полугидрат дигидрат сульфата кальция присутствует в концентрации по меньшей мере 85 мас.%. ! 5. Панель по п.1, в которой указанные волокна присутствуют в концентрации менее 3%, исходя из массы акустической панели. ! 6. Панель по п.1, в которой указанный легковесный заполнитель присутствует в концентрации менее 3%, ...

КОМПОЗИЦИЯ ДЛЯ ГИПСОВЫХ ПАНЕЛЕЙ И ПОЛУЧЕННЫЕ ПРОДУКТЫ

ОРГАНОМИНЕРАЛЬНЫЙ МОДИФИКАТОР ДЛЯ ГИПСОВЫХ КОМПОЗИЦИЙ И РАДИОЗАЩИТНЫХ ИЗДЕЛИЙ НА ИХ ОСНОВЕ

УЛУЧШЕННЫЕ ГИПССОДЕРЖАЩИЕ ИЗДЕЛИЯ, СОДЕРЖАЩИЕ АЛЬФА-ПОЛУГИДРАТ

... 1. Гипсовая стеновая плита, включающая: ! затвердевшую гипсовую композицию, сформированную между двумя по существу параллельными покровными листами, причем затвердевшая гипсовая композиция изготовлена с использованием гипссодержащей суспензии, включающей: ! воду и ! измельченный альфа-полугидрат, имеющий распределение частиц по размерам в следующем диапазоне: ! d(0,1) = приблизительно 3 мкм - 5 мкм; ! d(0,5) = приблизительно 14 мкм - 50 мкм; ! d(0,9) = приблизительно 40 мкм - 100 мкм ! и удельную поверхность по Блейну от приблизительно 3100 см2/г до приблизительно 9000 см2/г. ! 2. Гипсовая стеновая плита по п.1, в которой измельченный альфа-полугидрат имеет распределение частиц по размерам в следующем диапазоне: ! d(0,1) = приблизительно 3 мкм - 5 мкм; ! d(0,5) = приблизительно 14 мкм - 20 мкм; ! d(0,9) = приблизительно 40 мкм - 50 мкм ! и удельную поверхность по Блейну от приблизительно 3500 см2/г до приблизительно 6000 см2/г. ! 3. Гипсовая стеновая плита по п.1, в которой измельченный ...

МОКРОЕ ИЗМЕЛЬЧЕНИЕ ГИПСА С ПОЛИКАРБОКСИЛАТАМИ

... 1. Способ получения тонкоизмельченного гипсового продукта, включающий: ! получение загружаемого материала с исходным средним размером частиц; ! получение раствора поликарбоксилатного диспергатора в воде; ! добавление загружаемого материала к раствору с образованием суспензии; ! мокрое измельчение суспензии с целью уменьшения среднего размера частиц загружаемого материала. ! 2. Способ по п.1, в котором указанная стадия получения раствора дополнительно включает диспергирование порошка поликарбоксилата в воде и выдержку этого раствора в течение по меньшей мере 12 ч. ! 3. Способ по п.2, в котором указанную стадию выдержки проводят в течение по меньшей мере 24 ч. ! 4. Способ по п.1, в котором поликарбоксилатный диспергатор включает по меньшей мере три повторяющихся звена, включающих акриловые звенья, повторяющиеся звенья малеиновой кислоты и повторяющиеся звенья простого полиэфира с длинной цепью. ! 5. Способ по п.1, в котором указанное измельчение продолжают до достижения среднего размера частиц ...

ХИМИЧЕСКАЯ ДОБАВКА ДЛЯ ГИПСОВЫХ ИЗДЕЛИЙ

Изобретение относится к гипсовым композициям, гипсовым плитам, к способам их изготовления и к использованию дегидроаскорбиновой кислоты (DHA) в качестве препятствующей изгибу добавки в гипсовом изделии. Технический результат заключается в сопротивлении изгибу в условиях высокой влажности и температуры, повышении устойчивости гипсового изделия. Гипсовая композиция включает гипс и противодеформационную добавку, причем противодеформационная добавка включает, по меньшей мере, одно соединение, выбранное из группы, которую составляют дегидроаскорбиновая кислота, дегидроаскорбат и полудегидроаскорбиновая кислота. 5 н. и 6 з.п. ф-лы, 1 табл.

Verfahren und Anlage zur Wärmebehandlung feinkörniger mineralischer Feststoffe

Bei der Wärmebehandlung feinkörniger mineralischer Feststoffe, insbesondere der Kalzinierung von Ton oder Gips, werden die Feststoffe durch einen Flash-Reaktor (5) hindurchgeführt, in welchem sie bei einer Temperatur von 450 bis 1500°C mit heißen Gasen in Kontakt gebracht werden, und anschließend bei einer Temperatur von 550 bis 800°C durch einen Verweilzeitreaktor (7) geführt, aus welchem sie nach einer Verweilzeit von 1 bis 600 Minuten abgezogen und ggf. einer weiteren Behandlungsstufe zugeführt werden.

Verfahren und Anlage zur Wärmebehandlung feinkörniger mineralischer Feststoffe

Verfahren zur Wärmebehandlung feinkörniger mineralischer Feststoffe, wobei die Feststoffe durch einen Flash-Reaktor hindurchgeführt werden, in welchem sie bei einer Temperatur von 450 bis 1500°C und einer Verweilzeit zwischen 0,5 und 20 Sekunden, mit heißen Gasen in Kontakt gebracht werden, und wobei die Feststoffe anschließend bei einer Temperatur von 500 bis 890°C durch einen Verweilzeitreaktor geführt werden, aus welchem sie nach einer Verweilzeit von 1 bis 600 Minuten abgezogen werden.

Baustoff mit mikroverkapseltem Phasenwechselmaterial, Herstellungsverfahren dafür und Verwendung des Baustoffs

Baustoff in Form- eines Baustoff-Zuschlagstoffs mit an der Außenfläche des Zuschlagstoffes fixierten Mikrokapseln in denen Phasenwechselmaterial verkapselt ist oder- eines Baustoff-Bindemittels, ausgewählt aus Zement und Gips, mit an der Außenfläche der Bindemittelteilchen fixierten Mikrokapseln in denen Phasenwechselmaterial verkapselt ist, wobei die Mikrokapseln mittels eines bei der Herstellung von PCM-Mikrokapseln verwendeten Polymer-Tensids oder mittels eines wasser- oder fettlöslichen Bindemittels an den Bindemittelteilchen fixiert sind.

A system design of an efficient power generation plant

Improvements relating to the production of gypsum plaster

Temporarily fat gypsum plaster, which may be obtained by crushing gypsum rock containing insoluble impurities such as dolomitic limestone, marl and anhydrite and calcining it by indirect heating at atmospheric pressure for 1 to 3 hours to a final temperature of 270 DEG to 350 DEG F., is mixed with water below its boiling-point to form a slurry and the slurry is classified, preferably before any hydration, either in the form of the slurry itself or in the dry form obtained by drying the slurry without particle-aggregate formation, according to particle size into at least two fractions, the finer consisting of a purer CaSO4 product, the coarser preferably containing all the impurities. The calcined gypsum may be classified into a fine pure fraction and a coarse fraction bearing impurities, the latter only being treated to form a slurry. The fine pure fraction from the said initial classification may be mixed with the classified slurry to thicken it. A keratin retarder may be incorporated ...

PROCEDURE FOR TREATING GYPSUM WITH THE PRODUCTION OF GIPSPLATTEN

VERFAHREN ZUR SEPARATION VON ALPHA-CALCIUMSULFAT-HALBHYDRAT AUS EINER SUSPENSION UND WEITERVERARBEITUNG DES HALBHYDRATES ZU GIPSKORPERN ODER PULVERGIPS

VERFAHREN ZUR HERSTELLUNG VON STABILISIERTEM ABBINDEFAEHIGEM CALCIUMSULFAT DURCH UMSETZUNG VON ROHPHOSPHAT MIT SCHWEFELSAEURE

PROCEDURE FOR TREATING GYPSUM, IN PARTICULAR FOR THE HERSTELLUNBG OF ANHYDRITE BINDERS

High strength flooring compositions

Gypsum-based building products and method for the manufacture thereof

A building product comprises calcium sulphate dihydrate particles bound by an organic binder. The calcium sulphate dihydrate particles each have a longest dimension and a lateral dimension, wherein the lateral dimension corresponds to the maximum breadth of the particle about the axis defined by the longest dimension. The calcium sulphate dihydrate particles have a low aspect ratio such that for at least 75% of the calcium sulphate dihydrate particles, the value of the lateral dimension is at least 20% of the value of the longest dimension.

PROCESS FOR THE MANUFACTURE OF STABILISED, HARDENABLE CALCIUM SULPHATE BY REACTING CRUDE PHATE WITH SULPHURIC ACID

This invention is directed to a process for the manufacture of stabilised, hardenable calcium sulphate and in particular calcium sulphate hemi-hydrate. The product is obtained by reacting crude phosphate with sulfuric acid and washing the calcium sulphate with an aqueous medium. The process is characterised in that the calcium sulphate is washed with aqueous solutions of condensed and complex aluminium fluorides of the general formula MeAlF4, Me2AlF5 and Me5Al3F as well as AlF3.nH2O in which Me represents an alkali metal, ammonium or thallium-I ion and n is a number between 1 and 9 ...

MANUFACTURE OF CALCIUM SULPHATE ALPHAHEMIHYDRATE

GYPSUM PANELS, SYSTEMS, AND METHODS

Gypsum panels, sheathing systems, and methods of making and using the same are provided. A gypsum panel includes a gypsum core associated with a first fiberglass mat having a continuous barrier coating, the coating penetrating a portion of the first fiberglass mat opposite the gypsum core, wherein gypsum penetrates a remaining fibrous portion of the first fiberglass mat such that voids in the first fiberglass mat are substantially eliminated. A building sheathing system includes at least two gypsum panels and a seaming component to provide a seam at an interface between the gypsum panels.

GYPSUM BASED FORMULATIONS

Gypsum based formulations The formulation for making plasterboard with paper cover sheets comprises finely divided gypsum, a minor amount by weight of starch and, as crosslinking agent for the starch, a tri-functional reactive s-triazine having substituents at positions 2, 4 and 6 of the triazine ring which are reactive with the starch. A preferred crosslinking agent is 2,4,6-trichloros-triazine, which is preferably partially reacted with the starch before further reaction with the paper cover sheets for the plaster board..

GYPSUM FORMULATIONS

A gypsum formulation, typically for producing a gypsum building board, is produced by adding to an aqueous gypsum slurry containing a water swellable clay, acomb- based copolymer fluidiser and a basic water-soluble polymer having preferential affinity for clay, and allowing a layer of theaqueous gypsum slurry to set.

COMPOSITE PLASTERBOARD

A composite gypsum board comprising a gypsum material and a filler, characterized in that the filler contains paper chips and/or a paper chip assembly as the essential component, the paper chips and/or the chip assembly being arranged substantially parallel to the plane perpendicular to the thicknesswise direction of the board. A process for preparing the board is also provided. The board has markedly improved bending strength and resistance to pulling out of screws and nails. Further, it is valuable also from the viewpoint of effective utilization of wastes, a problem awaiting solution in recent years.

EFFICIENT PRODUCTION OF LANDPLASTER BY COLLECTING AND CLASSIFYING GYPSUM FINES

A landplaster production method includes the steps of providing a supply of particulate gypsum material, drying the gypsum material by passing a stream of heated air thereby as the material is rotated, classifying and separating the dried particles into fines and coarse particles, collecting the suspended fines in a collector, passing the coarse particles to a grinder such as a roller mill for reducing the particles, and mixing the reduced particles with the collected fines for processing into landplaster. The elimination of fines from the feed to the grinder results in significantly greater production by increasing the efficiency of the grinder. Further, the dryer is modified to agitate the dried gypsum material so that it may be more easily introduced into the classifier/separator situated adjacent the drier discharge outlet.

CHEMICAL ADDITIVES FOR GYPSUM PRODUCTS

CONSTRUCTION PANEL HAVING IMPROVED FIXING STRENGTH AND METHOD FOR THE MANUFACTURE THEREOF

BUILDING PANEL, WITH INCREASE STRENGTH OF FIXATION NNUYu, AND METHOD OF MANUFACTURING OF THE PANEL

BUILDING PANEL, HAVING TO INCREASE THE NNUYu STRENGTH OF FIXATION, AND METHOD OF MANUFACTURING THIS PANEL

TREATING CALCIUM SULPHATE

MACHINE A MELANGER ET A FABRIQUER LES BOULETTES

L'INVENTION CONCERNE UNE MACHINE A MELANGER ET A FABRIQUER DES BOULETTES. SELON L'INVENTION, ELLE COMPREND UNE ENCEINTE ALLONGEE AYANT UNE AUGE DISPOSEE HORIZONTALEMENT, ET AYANT DES PAROIS LATERALES ET OPPOSEES ET DES PAROIS EXTREMES 14 ET 16, L'AUGE AYANT DES EXTREMITES OPPOSEES D'ENTREE ET DE SORTIE 31 ET 32, UN ENSEMBLE D'UN ROTOR 26 COMPRENANT UN ARBRE AXIAL 54 AVEC UN CERTAIN NOMBRE DE BRAS 60 S'ETENDANT RADIALEMENT, UN MOTEUR 104 POUR FAIRE TOURNER L'ENSEMBLE DU ROTOR, DES PALES 70 AYANT UNE SECTION TRANSVERSALE UNIFORME SUR L'EXTREMITE EXTERNE DE CHAQUE BRAS, UN MOYEN DE PULVERISATION D'EAU 92, UN MUR D'ELEMENTS PENDANTS DE CHAINE 82, 84; L'AUGE EST FORMEE EN UN MATERIAU FLEXIBLE AVEC UN MOYEN POUR RESISTER A UN MOUVEMENT DE CETTE AUGE DANS LA DIRECTION DE LA ROTATION DE L'ENSEMBLE DU ROTOR POUR LA FORCER AINSI A ETRE FLECHIE CONTINUELLEMENT POUR EMPECHER UNE ACCUMULATION DU MATERIAU DANS L'AUGE. L'INVENTION S'APPLIQUE NOTAMMENT AU CALCAIRE ET AU GYPSE BROYES.

MANUFACTORING PROCESS Of a PLASTER FROM FERROUS SULPHATE AND PRODUCT OBTAINED FOLLOWING THIS PROCESS

CONSTRUCTION PANEL HAVING IMPROVED FIXING STRENGTH AND METHOD FOR THE MANUFACTURE THEREOF

PROCESS FOR THE PREPARATION OF FIBER CONTAINING ELEMENTS WHICH ARE DIRECTED TOWARD CONSTRUCTION

PROCESS AND DEVICE FOR PRODUCING FIBRE-REINFORCED PLASTER PLATES

Fibre-reinforced plaster plates are produced according to a single layer, continuous filtration process. A suspension of hemihydrate plaster and wet processed lignocellulose-containing fibres, preferably from used paper, is dewatered on a travelling screen. The apparent density of the plaster used is higher than 950 g/l, in the case of a alpha-hemihydrate plaster, and than 700 g/l, in the case of beta-hemihydrate plaster. In the RRSB-grid, the grain of the plaster has more than 40° gradient. beta-hemihydrate is aridized during calcination. The fibrous substance is pre-dewatered before being mixed with the plaster-fibre-suspension, then rediluted with water from the filtration process. The dewatering of the suspension is assisted in the last stage of vacuum filtration by vibrations or shearing forces. Devices for distributing the suspension and for generating the shearing forces are also disclosed.

Aqueous asphalt/wax emulsions for use in gypsum compositions and building products

Aqueous asphalt/wax emulsions are disclosed herein for use in gypsum formulations and other building products. The emulsions may include water; a wax component; an asphalt component; and at least one emulsifier. Optional additives may also be included in the emulsion or in a slurry formed from such emulsion for preparing a settable gypsum composition herein. Methods of making such emulsions are also provided.

Gypsum panels, systems, and methods

Gypsum panels, sheathing systems, and methods of making and using the same are provided. A gypsum panel includes a gypsum core associated with a first fiberglass mat having a continuous barrier coating, the coating penetrating a portion of the first fiberglass mat opposite the gypsum core, wherein gypsum penetrates a remaining fibrous portion of the first fiberglass mat such that voids in the first fiberglass mat are substantially eliminated. A building sheathing system includes at least two gypsum panels and a seaming component to provide a seam at an interface between the gypsum panels.

Process for preparing calcined gypsum and gypsum board

A process for preparing calcined gypsum (stucco) which comprises treating a mass of calcined gypsum by adding, with thorough blending, small portions of water (about 1-10% by weight) to the calcined gypsum, allowing it to heal, and grinding the healed stucco to recapture the rate of strength development and the ultimate strength which are adversely affected by the water addition. The principal advantage provided by the addition of small portions of water is a reduction in water demand which is retained despite the grinding and optional drying of the healed stucco. If the treated calcined gypsum is not used shortly after the healing procedure, it should be dried to provide storage stability. The reduced water demand is particularly useful in gypsum board manufacture.

Cement and concrete with reinforced material

Provided are compositions, methods and systems including cementitious compositions and reinforcing materials wherein the cementitious composition comprises a metastable component.

COMPOSITE GYPSUM BOARD AND METHODS RELATED THERETO

Disclosed is a composite gypsum board comprising a board core and a concentrated layer of substantial thickness (e.g., at least about 0.02 inches). The concentrated layer includes a higher weight percentage of an enhancing additive than the board core. The board core has a thickness greater than the thickness of the concentrated layer and forms the bulk of the board volume. The concentrated layer has a higher density (e.g., at least about 1.1 times greater) than the density of the board core. Also disclosed is a method of preparing a composite gypsum board. 1. A method of making composite gypsum board , the method comprising:(a) preparing a first slurry comprising stucco, water and enhancing additive;(b) applying the first slurry in a bonding relation to a first cover sheet to form a concentrated layer, the concentrated layer having a first face and a second face, wherein the first concentrated layer face faces the first cover sheet;(c) mixing at least water, stucco, and optionally the enhancing additive to form a second slurry;(d) applying the second slurry in a bonding relation to the concentrated layer to form a board core having a first face and a second face, the first board core face facing the second concentrated layer face;(e) applying a second cover sheet in bonding relation to the second board core face to form a board precursor, and i. when the second slurry contains the enhancing additive, the enhancing additive is more concentrated in the first slurry than the second slurry, and', 'ii. when dried, the board core has a thickness greater than the thickness of the concentrated layer., '(f) drying the board precursor to form a board; wherein2. The method of claim 1 , wherein claim 1 , when dried claim 1 , the concentrated layer has a density of at least about 1.1 times higher than a density of the board core.3. The method of claim 2 , wherein a density differential between the concentrated layer and the board core is at least about 8 pcf (about 130 kg/m).4. ...

Cementitious Compositions and Related Systems and Methods

Provided are cementitious compositions and related systems and methods. The cementitious compositions, or admixtures, according to the present invention generally comprise gypsum, a first alkaline component and glass. The admixture may further comprise fly ash, which is preferably obtained as a waste by-product from a coal-burning power plant. A method according to the present invention comprises an initial step of analyzing or receiving an analysis of a fly ash sample. Based at least in part on the analysis of the fly ash sample, a mix rate may be selected and an initial admixture can be formulated, which, when added to the fly ash sample, creates an alternative or additive to Portland cement for use in concrete, for example. 1. A method of forming a cementitious composition , said method comprising the steps of:determining an ash weight of a fly ash sample;selecting a mix strength of greater than or equal to 0.15 and less than or equal to 0.50;calculating an ash rate by subtracting said mix rate from 1.00;calculating a first intermediate factor by dividing said mix rate by said ash rate;calculating an admixture total weight by dividing said ash weight by said ash rate;calculating a mix weight by multiplying said total weight by said mix rate;calculating a rate adjustment factor by dividing a first ash factor less than one by the sum of one plus said intermediate factor;calculating a mix factor by subtracting said rate adjustment factor from said mix rate; andbased on said mix factor, selecting a first weight of gypsum, a second weight of a first alkaline component and a third weight of glass, wherein the sum of said first weight, said second weight, and said third weight equals said mix weight.2. A method according to claim 1 , wherein said first ash factor was formed by summing a first number and a second number claim 1 , whereinsaid first number is a measured percent by weight of calcium oxide contained in said sample of fly ash, andsaid second number is a ...

CEMENT AND CONCRETE WITH REINFORCED MATERIAL

Provided are compositions, methods and systems including cementitious compositions and reinforcing materials wherein the cementitious composition comprises a metastable component. 1. A composition comprising:a cementitious composition wherein the cementitious composition comprises a metastable component selected from the group consisting of vaterite, amorphous calcium carbonate, and combination thereof, anda reinforcing material.2. The composition of claim 1 , wherein the cementitious composition has a wet paste pH of less than 12.3. The composition of claim 1 , wherein the cementitious composition has a δC value less than −12.0‰.4. The composition of claim 1 , wherein the cementitious composition comprises at least 50 wt % vaterite.5. The composition of claim 1 , wherein the composition comprises more than 0.15% water-soluble chloride ion by weight of cement in the composition.6. The composition of claim 1 , wherein the reinforcing material does not exhibit changes in mechanical properties selected from the group consisting of elastic modulus claim 1 , tensile strength claim 1 , and yield strength claim 1 , when exposed to water soluble chloride repeatedly or for an extended period of time.7. The composition of claim 1 , wherein the reinforcing material is selected from the group consisting of aluminum claim 1 , glass fiber claim 1 , carbon fiber claim 1 , ceramics claim 1 , polymer claim 1 , grass claim 1 , grass product claim 1 , wood product claim 1 , and combination thereof.8. The composition of claim 1 , wherein the reinforcing material comprises stainless steel cladding treated rebar claim 1 , galvanized rebar claim 1 , stainless steel rebar claim 1 , fiber-reinforced plastic claim 1 , epoxy coated rebar claim 1 , titanium cladding treated rebar claim 1 , chrome plated/coated rebar claim 1 , nickel plated/coated rebar claim 1 , cobalt-chromium coated rebar claim 1 , or any combination thereof.9. The composition of claim 7 , wherein the reinforcing material ...

SLURRIES AND METHODS OF MAKING LIGHT WEIGHT GYPSUM BOARD

The invention generally provides gypsum-containing slurries including stucco, naphthalenesulfonate dispersant, and pregelatinized starch. The naphthalenesulfonate dispersant is present in an amount of about 0.1%-3.0% by weight based on the weight of dry stucco. The pregelatinized starch is present in an amount of at least about 0.5% by weight up to about 10% by weight of pregelatinized starch by weight based on the weight of dry stucco in the formulation. Other slurry additives can include trimetaphosphate salts, accelerators, binders, paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, gypsum wallboard, and a method of making gypsum wallboard. 130-. (canceled)31. A slurry comprising water , stucco , starch , and foaming agent;the starch is in an amount from about 0.5% to about 10% by weight based on the weight of the stucco;the foaming agent comprises a major weight portion of unstable component and a minor weight portion of stable component, the amount of foaming agent and the weight ratio of said unstable component to stable component effective to form a void distribution within a set gypsum composition formed from said slurry;when the slurry is cast and dried as a board comprising said set gypsum composition, the set gypsum composition comprises a continuous crystalline matrix substantially of calcium sulfate dihydrate, the board having a density of about 34 pcf or less and a core hardness of at least about 11 lb, the core hardness determined according to ASTM standard C473.32. The slurry of claim 31 , wherein the foaming agent comprises a blend of the unstable and stable components.33. The slurry of claim 31 , wherein the foaming agent comprises at least about 65% by weight of unstable component.34. The slurry of claim 31 , wherein the foaming agent is in an amount of about 0.1% or less by weight based on the weight of the stucco.35. The slurry of claim 31 , ...

CEMENT CLINKER, METHOD OF MANUFACTURING THE SAME AND CEMENT COMPOSITION

A cement clinker which can be sintered at 1,300 to 1,400° C. which is lower than the conventional sintering temperature and develops excellent strength characteristics such as mortar compression strength. 1. A cement clinker having a total content of tricalcium aluminate (3CaO.AlO:CA) and tetracalcium aluminoferrite (4CaO.AlO.FeO:CAF) calculated by Bogue's formulas of 22 mass % or more , a tricalcium silicate (3CaO.SiO:CS) calculated by Bogue's formula of 60 mass % or more and an iron modulus (I.M.) of 1.3 or less.2. The cement clinker according to which has a CAF content of 15 mass % or more.3. The cement clinker according to which has a total content of CS and dicalcium silicate (2CaO.SiO:CS) of 69 mass % or more.4. A cement composition comprising the cement clinker of and gypsum.5. The cement composition according to which further comprises at least one admixture selected from the group consisting of blast furnace slag claim 4 , siliceous admixture claim 4 , fly ash and limestone.6. A method of manufacturing a cement clinker claim 4 , comprising the steps of:{'sub': 3', '4', '3, "preparing raw materials to achieve a total content of CA and CAF calculated by Bogue's formulas of 22 mass % or more and a CS content calculated by Bogue's formula of 60 mass % or more and an iron modulus (I.M.) of 1.3 or less; and"}sintering the raw materials at 1,300 to 1,400° C.7. The cement clinker according to which has a total content of CS and dicalcium silicate (2CaO.SiO:CS) of 69 mass % or more.8. A cement composition comprising the cement clinker of and gypsum.9. A cement composition comprising the cement clinker of and gypsum.10. The cement composition according to which further comprises at least one admixture selected from the group consisting of blast furnace slag claim 8 , siliceous admixture claim 8 , fly ash and limestone.11. The cement composition according to which further comprises at least one admixture selected from the group consisting of blast furnace slag claim 9 ...

METHOD OF PROCESSING PLASTERBOARDS

A method of processing plasterboards or plasterboard for recover a calcium sulphate source for producing a hydraulic binder, includes comminuting plasterboards or a gypsum fraction thereof so as to obtain plasterboard particles and, thereafter, subjecting the plasterboard particles to a heat treatment at an elevated temperature so as to volatilize and/or decompose organic components present in the plasterboard particles. 1. A method of processing plasterboards for recovering a calcium sulphate source for producing a hydraulic binder , comprising the steps ofa) comminuting plasterboards or a gypsum fraction thereof so as to obtain plasterboard particles,b) subjecting the plasterboard particles to a heat treatment at an elevated temperature so as to volatilize and/or decompose organic components present in the plasterboard particles, wherein the heat treatment is carried out for a time period of less than 10 min.2. The method according to claim 1 , wherein the heat treatment comprises subjecting the plasterboard particles to a temperature in the range of 300° C. 550° C.3. The method according to claim 1 , wherein the heat treatment comprises subjecting the plasterboard particles or the gypsum fraction thereof to a temperature of 300° C.-390° C.4. The method according to claim 1 , wherein the heat treatment is carried out for a time period of 3-5 min.5. (canceled)6. The method according to claim 1 , wherein the heat treatment is carried out for a time period of ≥4 min.7. The method according to claim 1 , wherein claim 1 , before or after step a) claim 1 , a front and a back layer fraction is separated from a gypsum fraction of the plasterboard material.8. The method according to claim 1 , wherein step b) is carried out in an atmosphere that has an O-content of greater than 10 vol. %.9. A method comprising utilizing a calcium sulphate source obtained by a method according to as a component in the production of a hydraulic binder.10. The method according to claim 9 , ...

Chemical additive for gypsum products

The present invention provides a gypsum composition, a gypsum board and their preparation method and the use of DHA as an anti-sagging additive in a gypsum product. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises gypsum, and an anti-deformation additive, wherein the anti-deformation additive comprises at least one selected from a group consisting of dehydroascorbic acid, dehydroascorbate and semidehydroascorbic acid. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum product of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum product to meet the demands of the customer.

CONSTRUCTION MATERIAL CONTAINING MICROENCAPSULATED PHASE CHANGE MATERIAL, AND PREPARATION METHOD THEREOF

Disclosed is a construction & engineering material containing a microencapsulated phase change material, wherein one or more components of construction & engineering materials are selected from a group of construction & engineering materials such as sand, cement, gravel, admixture, gypsum, aggregate, plaster, fiber, and magnesium, and the PCM microcapsules are attached to outer surfaces of the selected one or more components of construction & engineering materials. 1. Construction & engineering material containing microencapsulated phase change material , wherein one or more components of construction & engineering materials are selected from a group of construction & engineering materials such as sand , cement , gravel , admixture , additive , gypsum , aggregate , plaster , fiber , and magnesium , and the PCM microcapsules are attached to outer surfaces of the selected one or more components of construction & engineering materials.2. The construction & engineering material of claim 1 , wherein the PCM microcapsules are provided in a slurry state to be uniformly distributed and mixed with the construction & engineering materials and is put into a drying chamber operating in a temperature range of 30° C. to 500° C. to be dried.3. The construction & engineering material of claim 1 , wherein the PCM microcapsules are provided in a slurry state to be uniformly distributed and mixed with the construction & engineering materials claim 1 , is put into a drying chamber operating in a temperature range of 30° C. to 500° C. claim 1 , and is attached to the outer surfaces of the construction & engineering materials under a circulating condition.4. The construction & engineering material of claim 1 , wherein one or more components of the construction & engineering materials are selected from the group of the construction & engineering materials such as sand claim 1 , cement claim 1 , gravel claim 1 , admixture claim 1 , additive claim 1 , gypsum claim 1 , aggregate claim 1 , ...

CALCINED GYPSUM TREATMENT DEVICE AND CALCINED GYPSUM TREATMENT METHOD

A calcined gypsum treatment apparatus has an agitating type of cooler provided with a cooling region for cooling the calcined gypsum, and a moisture supplying device for incorporating moisture into the calcined gypsum. The moisture supplying device includes a humid gas-feeding port which introduces humid gas including moisture or steam, directly into the cooling region. The calcined gypsum is introduced through a calcined gypsum introduction port into the cooling region, and the moisture is incorporated into the calcined gypsum to modify the calcined gypsum. The humid gas-feeding port is positioned in vicinity to the calcined gypsum introduction port so as to allow the spouted or delivered flow of the humid gas to be brought into contact with the calcined gypsum immediately after introduced into the cooling region. 1. A calcined gypsum treatment apparatus , which has a moisture supplying device for incorporating moisture into calcined gypsum and an agitating type of cooler provided with a cooling region for cooling the calcined gypsum;wherein said moisture supplying device includes a humid gas-feeding port which introduces a spouted flow or delivered flow of the humid gas, including moisture or steam, directly into the cooling region;wherein said cooler is provided with a calcined gypsum introduction port for introducing the calcined gypsum into said cooling region; andwherein said humid gas-feeding port is positioned in vicinity to said calcined gypsum introduction port so as to cause said spouted or delivered flow of the humid gas to be brought into contact with said calcined gypsum immediately after being introduced into said cooling region.2. The apparatus as defined in claim 1 , wherein said humid gas is a high temperature and high humidity gas produced in a calciner for calcination of said calcined gypsum and separated from the calcined gypsum; said cooler has a calcined gypsum supply device including the calcined gypsum introduction port; a calcined gypsum ...

APPARATUS AND METHODS FOR PRODUCING GYPSUM WALLBOARD

An apparatus for production of a gypsum product is provided which comprises a conveyer comprising a conveyer belt and means for rotating the conveyer belt; means for forming a gypsum product; and at least one laser scanner positioned over the conveyer belt at the location where the scanner scans at least one edge of the gypsum product which is at least partially set; and the laser scanner is in communication with a processor. Methods for forming a gypsum product with the apparatus are provided as well. 1. An apparatus for production of a gypsum product , the apparatus comprising:a conveyer comprising a conveyer belt and means for rotating the conveyer belt;means for forming a gypsum product; andat least one laser scanner, wherein the laser scanner is positioned over the conveyer belt at the location where the scanner scans at least one edge of the gypsum product which is at least partially set; andwherein the laser scanner is in communication with a processor.2. The apparatus of claim 1 , wherein the laser scanner is a three-dimensional laser scanner.3. The apparatus of claim 1 , wherein the processor is equipped with a software which calculates an edge angle of the gypsum product and a deviation in the value of the edge angle from a pre-specified value for the edge angle.4. The apparatus of claim 3 , wherein the software produces at least one signal which is triggered by the deviation of higher than 2%.5. The apparatus of claim 4 , wherein the signal is a sound signal claim 4 , a visual signal claim 4 , or a combination of the two signals.6. The apparatus of claim 1 , wherein the means for forming a gypsum product comprise means for feeding a first sheet of paper on the conveyer belt claim 1 , a mixer and means for feeding a second sheet of paper on the conveyer belt.7. The apparatus of claim 1 , wherein the apparatus comprises two laser scanners; a first laser scanner positioned such that the first scanner can scan the left edge of the gypsum product as the gypsum ...

PREGELATINIZED STARCH WITH MID-RANGE VISCOSITY, AND PRODUCT, SLURRY AND METHODS RELATED THERETO

Disclosed are product (e.g., panels), slurry, and methods relating to a pregelatinized starch having a mid-range viscosity (i.e., from about 20 centipoise to about 700 centipoise). 1. A board comprising:a set gypsum core disposed between two cover sheets, the core formed from a slurry comprising stucco, water and at least one pregelatinized starch, wherein the starch has a characteristic of a viscosity from about 35 centipoise to about 425 centipoise when the viscosity is measured while the starch is subjected to the conditions according to the VMA method,wherein the pregelatinized starch is in an amount from about 0.5% to about 5% by weight of the stucco,wherein the pregelatinized starch requires an increase in the amount of excess water needed to be added to the slurry to maintain the slurry fluidity at the same level it would be without the pregelatinized starch, that is less than the increase in the amount of excess water needed by a starch having a viscosity characteristic greater than 425 centipoise according to the VMA method, the board having a core hardness of at least about 11 lb, as determined according to ASTM C473.2. The board according to claim 1 , wherein the viscosity characteristic of the pregelatinized starch is from about 35 centipoise to about 200 centipoise according to the VMA method.3. The board according to claim 1 , wherein the water/stucco ratio is from about 0.55 to about 0.8.4. The board according to claim 1 , wherein the board has a density from about 24 pcf to about 35 pcf.5. The board according to claim 1 , wherein the slurry comprises a second type of starch that is (a) not gelatinized claim 1 , (b) is a pregelatinized starch having the characteristic of a viscosity below 35 centipoise according to the VMA method claim 1 , and/or (c) is a pregelatinized starch having the characteristic of viscosity above 425 centipoise according to the VMA method.6. The board according to wherein the second type of starch comprises alkylated starch.7. ...

SILOXANE POLYMERIZATION IN GYPSUM WALLBOARD

A method of making a gypsum board including: preparing an aqueous slurry including a mixture of: calcium sulfate hemihydrate, water at a weight ratio of water to calcium sulfate hemihydrate of 0.2:1 to 1.2:1, and on a dry basis per 100 parts by weight (pbw) calcium sulfate hemihydrate: 0.2 to 2 pbw siloxane, 0.01 to 2 pbw siloxane polymerization catalyst including magnesium oxide and optionally fly ash, and 0.01 to 0.2 pbw triethanolamine (TEOA); allowing the siloxane to polymerize to polysiloxane; and depositing the slurry on a first cover sheet and covering the slurry with a second cover sheet to shape the slurry, and allowing the shaped slurry to set to form the gypsum board. Also, disclosed is the gypsum board resulting from the method. 1. A method of making a gypsum board comprising: calcium sulfate hemihydrate,', 'water at a weight ratio of water to calcium sulfate hemihydrate of 0.2:1 to 1.2:1, and', 0.2 to 2 pbw siloxane,', '0.01 to 2 pbw siloxane polymerization catalyst comprising magnesium oxide and optionally fly ash, and', '0.01 to 0.2 pbw triethanolamine (TEOA);, 'on a dry basis per 100 parts by weight (pbw) said calcium sulfate hemihydrate], 'preparing an aqueous slurry comprising a mixture ofallowing the siloxane to polymerize to polysiloxane; anddepositing the slurry on a first cover sheet and covering the slurry with a second cover sheet to shape the slurry, andallowing the shaped slurry to set to form the gypsum board.2. The method of claim 1 ,wherein the siloxane polymerization catalyst is mixed with the calcium sulfate hemihydrate,wherein the siloxane is mixed with a first portion of the water to be used to prepare the aqueous slurry to form a siloxane/water emulsion,wherein the siloxane/water emulsion is mixed with a second portion of the water used to prepare the aqueous slurry, andwherein the calcium sulfate hemihydrate/magnesium oxide mixture is mixed with the siloxane emulsion, the triethanolamine and a remainder of the water for the aqueous ...

PREGELATINIZED STARCH WITH MID-RANGE VISCOSITY, AND PRODUCT, SLURRY AND METHODS RELATED THERETO

Disclosed are product (e.g., panels), slurry, and methods relating to a pregelatinized starch having a mid-range viscosity (i.e., from about 20 centipoise to about 700 centipoise). 1. Board comprising:a set gypsum core disposed between two cover sheets, the core formed from a slurry comprising stucco, water and at least one pregelatinized starch, wherein the starch has a characteristic of a viscosity from about 20 centipoise to about 700 centipoise when the viscosity is measured while the starch is subjected to the conditions according to the VMA method.2. Board according to claim 1 , wherein the viscosity characteristic of the starch is from about 30 centipoise to about 200 centipoise according to the VMA method.3. Board according to claim 1 , wherein the starch is effective to increase the core hardness of the set gypsum core relative to the set gypsum core without the starch.4. Board according to claim 1 , wherein the starch requires an increase in the amount of excess water needed to be added to the slurry to maintain the slurry fluidity at the same level it would be without the starch claim 1 , that is less than the increase in the amount of excess water needed by a starch having a viscosity characteristic greater than 700 centipoise (e.g. claim 1 , 773 centipoise) according to the VMA method.5. Board according to claim 1 , wherein the starch is in an amount from about 0.5% to about 3% by weight of the stucco.6. Board according to claim 1 , wherein the starch is acid-modified starch.7. Board according to claim 6 , wherein the acid-modified starch is acid-modified by sulfuric acid.8. Board according to claim 1 , wherein the water/stucco ratio is from about 0.55 to about 0.8.9. Board according to claim 1 , wherein the board has a density from about 24 pcf to about 35 pcf.10. Board according to claim 1 , wherein the slurry comprises a second type of starch that is (a) not gelatinized claim 1 , (b) is a pregelatinized starch having the characteristic of a viscosity ...

The usage of fly ash from flue gas desulfurization to make compositions for building

Composition for building materials comprises of fly ash from flue gas desulfurization. The fly ash (βCaSO 4 anhydrite), obtained from circulating fluidized bed flue gas desulfurization, is mixed with binder reactants at a ratio of 9:1. It's mainly used for non-structural cement mortar, bricks for paving walkways, brick wall decors, fire-resistant walls for interior partitions, plasterboards and so on. The binder reactants compose of 70% CaSO 4 .½H 2 O, 10% Na 2 SO 4 , 10% CaO, 5% NaOH, 0˜5% cement and 0˜5% starch. When the binder reactants are mixed with fly ash and water (30% to 40% of the above total weight), the hydration process of CaSO 4 anhydrite is accelerated.

Calcium Sulphate-Based Products

This invention relates to improved high temperature resistant calcium sulphate-based products e.g. gypsum wallboard products and, in particular, to products having reduced shrinkage at high temperatures. The invention provides calcium sulphate-based product comprising gypsum and a shrinkage resistance additive. The shrinkage resistance additive is melamine polyphosphate or melamine pyrophosphate. 121-. (canceled)22. A gypsum product in the form of a composite wallboard comprising:a first liner and a second liner; anda core sandwiched between the first liner and the second liner, the core comprising a set gypsum composition comprising gypsum and a shrinkage resistance additive, wherein the shrinkage resistance additive is melamine polyphosphate, melamine pyrophosphate or a combination thereof.23. The gypsum product according to claim 22 , wherein the shrinkage resistance additive is melamine polyphosphate.24. The gypsum product according to claim 22 , wherein the shrinkage resistance additive is melamine pyrophosphate.25. The gypsum product according to claim 22 , wherein the shrinkage resistance additive is present in the set gypsum composition in an amount from 0.1-20 wt %.26. The gypsum product according to claim 22 , wherein the shrinkage resistance additive is present in the set gypsum composition an amount from 1-10 wt %.27. The gypsum product according to claim 22 , wherein the shrinkage resistance additive is present in the set gypsum composition an amount from 1-5 wt %.28. The gypsum product according to claim 22 , wherein the shrinkage resistance additive is present in the set gypsum composition an amount from 2-5 wt %.29. The gypsum product according to claim 22 , wherein the core does not include inorganic fibers.30. The gypsum product according to claim 22 , wherein the core does not include glass fibers.31. The gypsum product according to claim 22 , made by a process comprising: forming an aqueous slurry comprising stucco and the shrinkage resistance ...

GYPSUM WALLBOARD AND METHOD OF MAKING SAME

Compositions for gypsum board are disclosed, comprising a mixture of a gypsum slurry and a pre-generated foam and a coalescing agent. The coalescing agent comprises one or more coalescing agents that are added to the composition singly, separately or in combination to change the size and distribution of the air bubbles in the foamed gypsum slurry. The resulting gypsum cores have increased nail pull resistance and an improved facer/gypsum core bond. 1. A foamed gypsum slurry composition , comprising:stucco;gauging water;a foam comprising foaming water, a foaming agent and air;a first coalescing agent having a first cloud point temperature; anda second coalescing agent having a second cloud point temperature that is different from the first cloud point temperature;wherein the foamed gypsum slurry composition has a mix temperature, and the first and second coalescing agents have a blended cloud point temperature that is lower than the mix temperature.2. The foamed gypsum slurry composition of claim 1 , wherein the blended cloud point temperature is lower than the mix temperature by about 5° F. to about 30° F.3. The foamed gypsum slurry composition of claim 1 , wherein the blended cloud point temperature is lower than the mix temperature by about 5° F. to about 10° F.4. The foamed gypsum slurry of claim 1 , wherein the first coalescing agent has a cloud point temperature of about 68° F. claim 1 , and the second coalescing agent has a cloud point temperature of about 110° F.5. The foamed gypsum slurry of claim 1 , wherein the first or second coalescing agent is a polyether block copolymer surfactant.6. The foamed gypsum slurry of claim 5 , wherein the polyether block copolymer surfactant is an ethylene oxide-propylene oxide block copolymer and/or reverse block copolymer.7. The foamed gypsum slurry of claim 1 , wherein the first or second coalescing agent is an alkoxylated alcohol surfactant.8. The foamed gypsum slurry of claim 7 , wherein the alkoxylated alcohol ...

COMPOSITIONS AND METHODS FOR REDUCING LIME BUCKING IN PLASTER PRODUCTS

Methods of treating lime bucking in a plaster slurry are described. The method involves providing a slurry exhibiting lime bucking having a cone penetration of less than 10 mm at a consistency of 60 cc, comprising: water; calcium sulfate hemihydrate; and hydrated lime; and mixing an effective amount of a dispersant comprising a low intensity dispersant into the slurry so that the cone penetration increases and wherein the cone penetration is 10 mm or more at 10 minutes after addition of the dispersant at a consistency of 60 cc; and applying the plaster slurry containing the dispersant to a substrate. Veneer plaster dry component mixtures having reduced lime bucking when made into a slurry containing a low intensity dispersant, or hydrated lime coated with wax or a dibenzoate plasticizer are also described. 1. A method of treating lime bucking in a plaster slurry comprising: water;', 'calcium sulfate hemihydrate; and', 'hydrated lime;, 'providing a slurry exhibiting lime bucking having a cone penetration of less than 10 mm at a consistency of 60 cc, the slurry comprisingmixing an effective amount of a dispersant comprising a low intensity dispersant into the slurry so that the cone penetration increases and wherein the cone penetration is 10 mm or more at 10 minutes after addition of the dispersant at a consistency of 60 cc; andapplying the plaster slurry containing the dispersant to a substrate.2. The method of wherein the effective amount of the dispersant is in a range of about 0.05 wt % to about 0.6 wt % based on total weight of solids in the slurry.3. The method of wherein the dispersant is a polymethacrylate dispersant.4. The method of wherein the polymethacrylate dispersant has an anionic group attached to the polymethacrylate backbone.5. The method of wherein the polymethacrylate dispersant comprises a sodium polymethacrylate dispersant.6. The method of further comprising mixing the dispersant with accelerator before mixing the dispersant into the slurry.7. ...

PROCESS TO MAKE CALCIUM OXIDE OR ORDINARY PORTLAND CEMENT FROM CALCIUM BEARING ROCKS AND MINERALS

Aspects of the invention include a method of producing a cement material comprising step of: first reacting a calcium-bearing starting material with a first acid to produce an aqueous first calcium salt; second reacting the aqueous first calcium salt with a second acid to produce a solid second calcium salt; wherein the second acid is different from the first acid and the second calcium salt is different from the first calcium salt; and thermally treating the second calcium salt to produce a first cement material. Preferably, but not necessarily, during the second reacting step, reaction between the first calcium salt and the second acid regenerates the first acid. 1. A method of producing a cement material , the method comprising steps of:first reacting a calcium-bearing starting material with a first acid to produce an aqueous first calcium salt;second reacting the aqueous first calcium salt with a second acid to produce a solid second calcium salt; wherein the second acid is different from the first acid and the second calcium salt is different from the first calcium salt; andthermally treating one or more calcium salts to produce a first cement material.2. The method of claim 1 , wherein the one or more calcium salts comprises the second calcium salt.3. The method of claim 1 , wherein claim 1 , during the second reacting step claim 1 , reaction between the first calcium salt and the second acid regenerates the first acid.45-. (canceled)6. The method of comprising a first separating step after the first reacting step and before the second reacting step; the first separating step comprising separating a first aqueous fraction from a first solid fraction; wherein the first aqueous fraction comprises the aqueous first calcium salt and the first solid fraction comprises one or more solid byproducts formed during the first reacting step.78-. (canceled)9. The method of comprising a second acid regeneration step; wherein the second acid regeneration step comprises ...

SURFACTANT-COATED HEMIHYDRATE GYPSUM AND PRODUCTION METHOD THEREOF

Surfactant-coated hemihydrate gypsum which is coated with 0.01 to 1 part by weight of a surfactant based on 100 parts by weight of hemihydrate gypsum, wherein 1. Surfactant-coated hemihydrate gypsum which is coated with 0.01 to 1 part by weight of a surfactant based on 100 parts by weight of hemihydrate gypsum , whereinthe residual rate of the surfactant when the surfactant-coated hemihydrate gypsum is heated up to 300° C. is not less than 40 wt % of the amount of the surfactant before heating.2. The surfactant-coated hemihydrate gypsum according to claim 1 , wherein the coating amount of the surfactant is 0.1 to 0.6 part by weight based on 100 parts by weight of hemihydrate gypsum.3. The surfactant-coated hemihydrate gypsum according to claim 1 , wherein the surfactant is at least one selected from the group consisting of sulfates of a polyoxyalkylene claim 1 , alkali metal salts of a higher fatty acid claim 1 , fatty acid esters of glycerin and polyoxyalkylene-based nonionic surfactants.4. The surfactant-coated hemihydrate gypsum according to which has a cumulative pore volume of not more than 0.5 mL/g.5. A method of producing the surfactant-coated hemihydrate gypsum of claim 1 , comprising the step of heating a composition containing at least dihydrate gypsum and a surfactant at 110 to 200° C.6. The method according to claim 5 , wherein the dihydrate gypsum is at least one selected from the group consisting of natural gypsum claim 5 , flue-gas desulfurized gypsum and recovered dihydrate gypsum which has undergone a crystallization step.7. The surfactant-coated hemihydrate gypsum according to claim 2 , wherein the surfactant is at least one selected from the group consisting of sulfates of a polyoxyalkylene claim 2 , alkali metal salts of a higher fatty acid claim 2 , fatty acid esters of glycerin and polyoxyalkylene-based nonionic surfactants.8. The surfactant-coated hemihydrate gypsum according to which has a cumulative pore volume of not more than 0.5 mL/g. The ...

INSULATING MINERAL FOAM

A process for producing a mineral foam includes (i) separately preparing one or more slurries of cement, and an aqueous foam for which a D50 of bubbles is less than or equal to 400 μm; (ii) homogenizing the one or more slurries of cement with the aqueous foam to obtain a slurry of foamed cement; (iii) casting the slurry of foamed cement and leaving the cast slurry of foamed cement to set. 1. A process for production of a mineral foam comprising:(i) separately preparing one or more slurries of cement, and an aqueous foam for which a D50 of bubbles is less than or equal to 400 μm;(ii) homogenizing the one or more slurries of cement with the aqueous foam to obtain a slurry of foamed cement;(iii) casting the slurry of foamed cement and leaving the cast slurry of foamed cement to set.2. The process for production of a mineral foam according to claim 1 , wherein step (i) comprises the preparation of two slurries of cement claim 1 , one of which is a slurry of calcium aluminate cement.3. The process for production of a mineral foam according to claim 1 , wherein step (ii) comprises the introduction of the slurry or slurries of cement and the aqueous foam into a static mixer to obtain a slurry of foamed cement.4. A mineral foam obtainable according to the process of .5. The mineral foam obtainable according to having a density of 100 to 600 kg/m.7. The mineral foam according to claim 6 , wherein the slurry of foamed cement comprises 15 to 50% of mineral particles.8. The mineral foam according to claim 7 , wherein the mineral particles are selected from the group consisting of calcium carbonate claim 7 , silica claim 7 , ground glass claim 7 , solid or hollow glass beads claim 7 , glass granules claim 7 , expanded glass powders claim 7 , silica aerogels claim 7 , silica fume claim 7 , slags claim 7 , ground sedimentary siliceous sands claim 7 , fly ash or pozzolanic materials and mixtures thereof.9. The mineral foam according to claim 6 , wherein the calcium aluminate cement ...

GYPSUM BOARDS WITH POLYMER COATING AND METHODS FOR MAKING SAME

A gypsum board provided with a foamed gypsum core layer, a facing sheet over the foamed gypsum core, and a latex polymer coating layer on an outer surface of the facing sheet. The latex polymer having a glass transition temperature (Tg) of 0 to 35° F. Methods for making the board are also disclosed. 1. A gypsum board comprising:a face paper sheet having an inner bond surface and an outer surface, the face paper sheet inner bond surface opposed to the face paper sheet outer surface, the face paper sheet treated with a polymer coating composition disposed on the entire outer surface of the face paper sheet to have a polymer coating, 0.05 to 0.25 wt. % 2-amino-2-methyl-1-propanol,', '0 to 0.5 wt. % dispersant selected from at least one member of the group consisting of polycarboxylate dispersant, polyphosphate dispersant, and naphthalene dispersant,', 'preferably the polycarboxylate dispersant comprises a polycarboxylic ether dispersant,', 'preferably the naphthalene dispersant is selected from at least one of beta-naphthalene sulfonate, naphthalene sulfonate formaldehyde condensate and sodium naphthalene sulfate formaldehyde condensate,', 'preferably the polyphosphate dispersant is selected from at least one member of the group consisting of sodium trimetaphosphate (STMP), sodium tripolyphosphate (STPP), potassium tripolyphosphate (KTPP), tetrasodium pyrophosphate tetrapotassium pyrophosphate, and tetrapotassium pyrophosphate (TKPP), more preferably the polyphosphate is tetrapotassium pyrophosphate (TKPP),', '0.02 to 0.5 wt. % thickener selected from at least one member of the group consisting of a cellulose thickener and an acrylate thickener,', '0.01 to 0.5 wt. % silicon based defoamer,', '4.5 to 15 wt. %, preferably 4.8 to 6.5 wt. %, more preferably 4.8 to 5.2 wt. %, latex comprising latex polymer having a glass transition temperature (Tg) of 0 to 35° F., preferably 25 to 32° F., the latex polymer having a weight average molecular weight of 40,000 to 500,000, the ...

Construction Panel Having Improved Fixing Strength and Method for the Manufacture Thereof

A plasterboard comprises a gypsum matrix having fibres embedded therein. The plasterboard optionally has a backing lamina attached to one of the faces thereof. The gypsum matrix of the plasterboard optionally comprises a polymeric additive. 1. A panel comprising a plasterboard , the plasterboard having a backing lamina attached to one of the faces thereof , the plasterboard comprising a gypsum matrix having fibres embedded therein in an amount of at least 1 wt % relative to the gypsum.2. A panel according to claim 1 , wherein the gypsum matrix further comprises a starch additive claim 1 , the starch additive being present in an amount of at least 1 wt % relative to the gypsum.3. A panel according to claim 2 , wherein the starch additive is present in the gypsum matrix of the plasterboard in an amount of at least 2 wt % relative to the gypsum.4. A panel according to claim 1 , wherein the fibres are present in the gypsum matrix of the plasterboard in an amount of at least 2 wt % relative to the gypsum.5. A panel according to claim 1 , in which the fibres are selected from a group comprising glass fibres claim 1 , wood fibres claim 1 , fibres derived from wood (such as regenerated cellulose fibres) claim 1 , and mixtures thereof.6. A panel according to claim 5 , wherein the fibres are regenerated cellulose fibres and further wherein the average length of the fibres lies in the range 0.1-0.5 mm and/or the average diameter of the fibres is below 20 micron.7. A panel according to claim 1 , wherein the fibres are present within the board in the form of particles of agglomerated fibres claim 1 , such as paper particles or wood particles.8. A panel according to claim 7 , wherein the maximum dimension of the particles is in the range 0.5-3 mm and/or the average length of the fibres within the particles is in the range 1-15 mm and/or the average diameter of the fibres within the particles is in the range 1-50 micron.9. A panel according to claim 5 , wherein the fibres are ...

BASE-MEDIATED HYDROPHOBING COMPOSITIONS AND PROCESSES

Water-resistant gypsum boards and compositions and methods for their manufacture are provided. The methods include forming a mixture of water, hydroxide, and siliconate, adding siloxane to the mixture, adding calcium sulfate hemi-hydrate to the mixture to form an aqueous slurry, curing the aqueous slurry under heat, drying the aqueous slurry, and forming a water-resistant gypsum board. 1. A method for making a water-resistant gypsum board , comprising:forming a mixture of water and hydroxide;adding siloxane to the mixture;adding calcium sulfate hemi-hydrate to the mixture to form an aqueous slurry;curing the aqueous slurry under heat;drying the aqueous slurry; andforming a water-resistant gypsum board.2. The method of claim 1 , wherein the mixture further comprises siliconate.4. The method of claim 1 , wherein the pH of the aqueous slurry is above 9.5. The method of claim 1 , wherein the hydroxide is selected from the group consisting of sodium hydroxide claim 1 , potassium hydroxide claim 1 , lithium hydroxide claim 1 , rubidium hydroxide claim 1 , caesium hydroxide claim 1 , francium hydroxide claim 1 , calcium dihydroxide claim 1 , magnesium dihydroxide claim 1 , beryllium dihydroxide claim 1 , strontium dihydroxide claim 1 , barium dihydroxide claim 1 , radium dihydroxide claim 1 , and combinations thereof.6. The method of claim 1 , wherein curing the aqueous slurry comprises heating the aqueous slurry at a temperature of about 35° C. to about 300° C.8. The method of claim 1 , further comprising adding an accelerator to the mixture claim 1 , the accelerator comprises calcium sulfate dihydrate claim 1 , potassium sulfate claim 1 , or a combination thereof.9. The method of claim 1 , further comprising adding a dispersant to the mixture claim 1 , the dispersant comprising polynaphthalene sulfonate claim 1 , polycarboxylate claim 1 , or a combination thereof.10. The method of claim 1 , further comprising adding a foaming agent to the mixture claim 1 , the foaming ...

COMPOSITIONS WITH SYNTHETIC GYPSUM AND METHODS

DTPA-coated synthetic calcined gypsum is provided with alpha-like properties and obtained by spray-coating the synthetic caclined gypsum with DTPA. Cementitious compositions comprising DTPA-coated synthetic calcined gypsum and low water demand are provided as well. Methods for controlling an open time of a cementitious slurry by increasing or decreasing the amount of DTPA-coated synthetic calcined gypsum in the slurry are provided as well. 1. Synthetic calcined gypsum coated with diethylene-triamine-pentaacetic acid (DTPA) , wherein the synthetic calcined gypsum is obtained by spray-coating the synthetic calcined gypsum with DTPA in a fluidized bed chamber at a temperature in the range from 190 degrees Fahrenheit to 340 degrees Fahrenheit.2. The synthetic calcined gypsum coated with DTPA of claim 1 , wherein the setting time of the DTPA-coated synthetic calcined gypsum is from 150 to 300 minutes.3. The synthetic calcined gypsum coated with DTPA of claim 1 , wherein the temperature is in the range from 212 degrees Fahrenheit to 300 degrees Fahrenheit.4. The synthetic calcined gypsum coated with DTPA of claim 1 , wherein DTPA is used at 0.1 to 1.0 lbs/min for spray coating of the synthetic calcined gypsum in the fluidized bed chamber.5. The synthetic calcined gypsum coated with DTPA of claim 1 , wherein the DTPA-coated calcined gypsum is obtained without drying the DTPA-coated calcined gypsum after it exits from the fluidized bed chamber.6. The synthetic calcined gypsum coated with DTPA of claim 1 , wherein the dosage rate of spray coating with the DTPA is in the range of 0.1 to 40 lb/min of the DTPA liquid onto the synthetic calcined gypsum with a flow rate of approximately 9-11 tons/hour.7. The synthetic calcined gypsum coated with DTPA of claim 1 , wherein the DTPA-coated synthetic calcined gypsum is obtained by spray-coating the synthetic calcined gypsum with DTPA and additionally by spray-coating with a second compound selected from the group consisting of ...

Gypsum-Based Building Products and Method for the Manufacture Thereof

A building product comprises calcium sulphate dihydrate particles bound by an organic binder. The calcium sulphate dihydrate particles each have a longest dimension and a lateral dimension, wherein the lateral dimension corresponds to the maximum breadth of the particle about the axis defined by the longest dimension. The calcium sulphate dihydrate particles have a low aspect ratio such that for at least 75% of the calcium sulphate dihydrate particles, the value of the lateral dimension is at least 20% of the value of the longest dimension. 1. A building product comprising calcium sulphate dihydrate particles bound by an organic binder ,the calcium sulphate dihydrate particles each having a longest dimension and a lateral dimension, the lateral dimension corresponding to the maximum breadth of the particle about the axis defined by the longest dimension,the calcium sulphate dihydrate particles having a low aspect ratio such that for at least 75% of the calcium sulphate dihydrate particles, the value of the lateral dimension is at least 20% of the value of the longest dimension.2. A building product according to claim 1 , wherein the value of the lateral dimension is at least 40% of the value of the longest dimension.3. A building product comprising calcium sulphate dihydrate particles bound by an organic binder claim 1 , wherein 90 wt % of the calcium sulphate dihydrate particles have a particle size in the range of 1 μm to 3 mm.4. A building product according to claim 1 , wherein the building product is a self-supporting body.5. A building product according to claim 1 , wherein the binder is a vegetable-derived organic binder that is optionally modified through cross-linking.6. A building product according to claim 5 , wherein the binder comprises one or more of the following:soy and/or a derivative of soy;starch and/or a starch derivative.7. A building product according to claim 1 , wherein the binder is present in an amount of 0.5-30 wt % of the product.8. A ...

METHOD FOR REDUCING AGGLOMERATION IN GYPSUM PLASTER OR FILLING COMPOSITIONS COMPRISING CELLULOSE ETHER

The present invention relates to a method for providing modified gypsum plaster or filling compositions having reduced agglomeration in comparison to gypsum plaster or filling compositions comprising cellulose ether in a specific amount from 0.1 to 1.0 weight percent, based on the total dry weight of said composition. Also provided are dry mortars comprising cellulose ether, gelatin and gypsum for use in such methods, and gypsum-free mixtures comprising cellulose ether and gelatin which may be added to gypsum binder for use a for use in such methods. 1. A method for providing a modified gypsum plaster or filling composition having reduced agglomeration in comparison to a gypsum plaster or filling composition comprising a water soluble cellulose ether in a specified amount X , where the specified amount is from 0.1 to 1.0 weight percent based on the total dry weight of said composition components , said method comprising:a) forming a dry mortar comprising gypsum binder; water soluble cellulose ether in an amount of X minus Y; and gelatin in an amount Y, wherein Y is from 0.02X to 0.30X; andb) combining said dry mortar with water to form a modified gypsum plaster or filling composition.2. The method according to claim 1 , wherein said cellulose ether is an alkylhydroxyalkylcellulose claim 1 , a hydroxyalkyl cellulose claim 1 , an alkyl cellulose or a mixture thereof.3. The method according to claim 2 , wherein said alkylhydroxyalkylcellulose is selected from a methylhydroxyethylcellulose (MHEC) claim 2 , an ethylhydroxyethylcellulose (EHEC) claim 2 , a methyl hydroxypropylcellulose (MHPC) claim 2 , a methylethylhydroxyethylcellulose (MEHEC) claim 2 , a methylhydroxy-ethylhydroxypropylcellulose (MHEHPC) and mixtures thereof.4. The method according to claim 2 , wherein claim 2 , when said cellulose ether is an alkylhydroxyalkylcellulose claim 2 , said alkylhydroxyalkylcellulose has a DS(alkyl) of from >1 to 1.99 and an MS (hydroxyalkyl) of from 0.01 to <1 claim 2 , ...

POLYMERIC DISPERSANT

The invention relates to a dispersant comprising a polymer obtainable by copolymerization of monomers including 5 to 80 mol % of a hydroxyalkyl acrylate phosphate and/or hydroxyalkylacrylamide phosphate (monomer 1), 0 to 20 mol % of a di(hydroxyalkyl acrylate) phosphate and/or di(hydroxyalkylacrylamide) phosphate (monomer 2) and 1 to 80 mol % of a polyalkylene glycol-containing macromonomer comprising an alkene group (monomer 3). Further disclosed is a process for preparing the polymers of the invention and the use thereof as dispersants in calcium sulphate-containing compositions. A further aspect of the invention is a process for producing shaped gypsum bodies, and also shaped gypsum bodies, more particularly gypsum plasterboards and self-levelling screeds, comprising the dispersant of the invention. 113.-. (canceled)15. A dispersant according to claim 14 , wherein the polymer consists of monomer 1.16. A dispersant according to claim 14 , wherein the group Rboth in monomer 1 and in monomer 2 is an ethylene group.17. A dispersant according to claim 14 , wherein the group Rin monomer 1 is an ethylene group.18. A dispersant according to claim 14 , wherein the polymer consists of monomer 1 and monomer 2.19. A dispersant according to claim 18 , wherein the group Rboth in monomer 1 and monomer 2 is an ethylene group.20. A dispersant according to claim 14 , wherein the polymer has an average molecular weight of between 15 claim 14 ,000 and 60 claim 14 ,000 g/mol claim 14 , the molecular weight being measured by gel permeation chromatography against a PEG standard.21. A process for preparing a polymer according to claim 14 , comprising:copolymerizing in an aqueous solution at least one monomer 1 of the formula (1), optionally at least one monomer 2 of the formula (2), and at least one monomer 3 of the formula (3).22. A process according to claim 21 , wherein the temperature of the reaction solution is set between 5 and 100° C. and the pH between 0.5 and 8.23. A calcium ...

Method For Reducing Elemental Sulfur In Gypsum Products

Disclosed are various methods for reducing levels of elemental sulfur within gypsum products such as wall board. Gypsum sometimes includes increased levels of elemental sulfur. Such sulfur can be corrosive and otherwise harmful at elevated levels. The disclosure contemplates reacting the elemental sulfur with copper to copper sulfide. This reaction has the benefit of reducing the levels of elemental sulfur present within the final gypsum product. The copper can be added at any of a variety of locations in the manufacturing process. This is a very efficient method for reducing elemental sulfur in the production of gypsum products.

SYSTEM AND METHOD FOR MANUFACTURING CEMENTITIOUS BOARDS WITH ON-LINE BOARD MEASUREMENT

Embodiments of a system and a method for continuously measuring cementitious board during the continuous manufacture thereof can be used in connection with the manufacture of various cementitious products, including gypsum wallboard, for example. Embodiments of a system and a method for continuously measuring cementitious board during its continuous manufacture can be used online in a continuous manufacturing process to effectively determine the degree to which cementitious slurry has set (e.g., expressed as percent hydration) at a predetermined location, such as, near a cutting station, for example. A height measuring system can be used to determine the relative amount the cementitious board sags as it passes over an unsupported span disposed between the forming station and the cutting station and to correlate the measured sag distance with a value of percent hydration of the cementitious slurry of that particular portion of the cementitious board. 1. A system for manufacturing a cementitious board , the cementitious board having a cementitious core interposed between a pair of cover sheets , the cementitious core formed from an aqueous cementitious slurry , the system comprising:a forming station, the forming station configured to form the cementitious board such that the cementitious board is within a predetermined thickness range;a conveyor, the conveyor configured to convey the cementitious board along a machine direction away from the forming station, the conveyor including an upstream support surface and a downstream support surface, the upstream support surface and the downstream support surface both extending along the machine direction and a cross-machine direction, the cross-machine direction being perpendicular to the machine direction, the upstream support surface and the downstream support surface in discontinuous relationship with respect to each other such that an unsupported span is defined therebetween along the machine direction over which the ...

GYPSUM COMPOSITES CONTAINING CEMENTITIOUS MATERIALS AND METHODS

Gypsum composites containing cementitious materials and methods of making the same are provided. Gypsum composites include gypsum and a cementitious material. Methods of making gypsum composites include combining gypsum stucco, water, and a cementitious material to form a slurry, and setting and drying the slurry to form a gypsum composite. 1. A method of making a gypsum composite , comprising:combining gypsum stucco, water, and a cementitious material to form a slurry; andsetting and drying the slurry to form a gypsum composite.2. The method of claim 1 , wherein the gypsum stucco comprises alpha hemihydrate gypsum claim 1 , beta hemihydrate gypsum claim 1 , or a combination thereof3. The method of claim 1 , wherein the cementitious material is selected from the group consisting of: calcium silicate cements claim 1 , calcium aluminate cements claim 1 , calcium sulfoaluminate cements claim 1 , phosphate cements claim 1 , magnesium oxychloride cements claim 1 , magnesium oxysulfate cements claim 1 , magnesium phosphate cements claim 1 , quick set cements claim 1 , and combinations thereof4. The method of claim 1 , wherein the cementitious material comprises Portland cement Type III.5. The method of claim 1 , wherein the cementitious material comprises quick lime or hydrated lime.6. The method of claim 1 , wherein combining gypsum stucco claim 1 , water claim 1 , and cementitious material comprises first combining the cementitious material and the gypsum stucco to form a dry mix and subsequently combining the dry mix with the water.7. The method of claim 6 , wherein the dry mix comprises the cementitious material in an amount from 0.1 percent to 10 percent by weight of the dry mix.8. The method of claim 6 , wherein the dry mix comprises the cementitious material in an amount from about 0.5 percent to about 3 percent by weight of the dry mix.9. The method of claim 1 , wherein the slurry comprises water in an amount from about 50 percent to about 100 percent by weight of ...

STABILIZED GYPSUM PARTICLES

The present invention is directed to a construction chemical composition for the preparation of gypsum articles, said construction chemical composition comprising fine calcium sulfate and a dispersant being a polyarylether. Further the present invention is directed to a process for preparing said construction chemical composition as well as an article comprising said construction chemical composition. 116.-. (canceled)17. A construction chemical composition , comprisingi) fine calcium sulfate particles having a D (0.63) particle size of less than 10.0 μm determined with laser diffraction according to Mie Theory, andii) a dispersant being a polyarylether,wherein the weight ratio between the fine calcium sulfate particles and the dispersant is in the range of 0.1:99.9 to 99.9:0.1.18. A construction chemical composition according to claim 17 , wherein the fine calcium sulfate particles are present in the form of calcium sulfate hemihydrate claim 17 , calcium sulfate dihydrate claim 17 , anhydrous calcium sulfate or mixtures thereof.19. A construction chemical composition according to claim 17 , wherein the polyarylether is a polycondensation product comprisingi) at least one aromatic or heteroaromatic structural unit comprising a polyether side chain, andii) at least one phosphated aromatic or heteroaromatic structural unit.21. A process for the preparation of a construction chemical composition comprising fine calcium sulfate having a D (0.63) particle size of less than 10.0 um determined with laser diffraction according to Mie Theory and a dispersant being a polyarylether claim 17 , said process comprising the steps ofaa) providing a suspension comprising calcium sulfate particles having a D (0.63) particle size equal or above 10.0 um determined with laser diffraction according to Mie Theory, water and a dispersant being a polyarylether, andab) wet-grinding of the slurry obtained in step aa), thereby obtaining the construction chemical composition,wherein the weight ...

Sizing composition for wet use chopped strand glass fibers

A sizing composition including water, a polyvinylpyrrolidone film former, a silane coupling agent, a lubricant, and a surfactant is provided. The polyvinylpyrrolidone film former constitutes from 30 wt. % to 50 wt. % of the dry solids of the sizing composition. Wet use chopped strand glass fibers for use in reinforcing gypsum board are also provided. The wet use chopped strand glass fibers include chopped glass fibers having the sizing composition applied thereto. The sizing composition improves fiber bundle integrity, fiber flow rate, fiber flow rate consistency, and dispersibility of the wet use chopped strand glass fibers in a gypsum matrix or slurry.

GYPSUM BOARD WITH IMPROVED STARCH BINDER

Gypsum board having improved performance is obtained by controlling the distribution of starch in the gypsum core of the board and the gelling temperature of the starch. Starch migration in the board is controlled by the degree of acid-modification, to adjust the starch viscosity profile. The starch gelling temperature is controlled by chemical modification of the starch —OH groups. 1. A gypsum board formed from a gypsum slurry having a composition comprising:stucco; andan acid modified starch having a peak viscosity of between about 200 BU to about 2000 BU.2. The gypsum board of claim 1 , wherein the acid modified starch has a peak viscosity of between about 800 BU to about 2000 BU.3. The gypsum board of claim 1 , wherein the acid modified starch has a peak viscosity of between about 200 BU to about 800 BU.4. The gypsum board of claim 1 , wherein the acid modified starch is chemically modified to reduce the peak gelling temperature.5. The gypsum board of claim 1 , wherein the acid modified starch is chemically modified to reduce hydrogen bonding between starch molecules.6. The gypsum board of claim 1 , wherein acid modified starch has —OH groups that are modified by ethoxylation.7. The gypsum board of claim 6 , wherein the acid modified starch has a peak gelling temperature of about 180° F. or less.8. The gypsum board of claim 6 , wherein the acid modified starch has a peak gelling temperature of about 170° F. or less.9. The gypsum board of claim 6 , wherein the acid modified starch has a peak gelling temperature of about 165° F. or less.10. The gypsum board of claim 6 , wherein the acid modified starch has a peak gelling temperature of between about 150° F. to about 165° F.11. A gypsum board claim 6 , comprising:a gypsum core formed from a gypsum slurry comprising stucco and an acid modified starch, the gypsum core having a front side, a back side, and a center core between the front and back sides; anda facing material disposed at the front and back sides of the ...

Constrictor valve with webbing, cementitious slurry mixing and dispensing assembly, and method for making cementitious product

A constrictor valve can be associated with a conduit in fluid communication with a mixer to control a flow of cementitious slurry discharged from the mixer through the conduit. The constrictor valve can include a constrictor housing, a webbing constriction assembly, and a drive mechanism. The webbing constriction assembly includes a pair of rotatable members rotatably mounted to the constrictor housing and a plurality of webbing straps connected to the rotatable members and wrapped around the conduit. The drive mechanism includes a drive shaft and a gear assembly configured to rotate the rotatable members in opposing winding directions in response to the drive shaft rotating in a tighten direction to wrap the webbing straps tighter around the conduit to compress it and to rotate in opposing unwinding directions in response to the drive shaft rotating in a loosen direction to loosen the grip of the webbing straps on the conduit.

GYPSUM FIBER BOARD AND METHOD FOR PRODUCING GYPSUM FIBER BOARDS

A gypsum fiber board produced in a Siempelkamp dry-process, comprising 75 wt % to 90 wt % (relative to the total dry mix) of calcium sulfate hemi-hydrate and 10 wt % to 25 wt % (relative to the total dry mix) paper fibers, wherein the calcium sulfate hemi-hydrate is a mixture of α-calcium sulfate hemi-hydrate and β-calcium sulfate hemi-hydrate, wherein the content of α-calcium sulfate hemi-hydrate in the mixture is at least 5 wt % (relative to the total calcium sulfate hemi-hydrate) is disclosed. Also disclosed is a method for producing a gypsum fiber board of a thickness of 23 mm in a Siempelkamp dry-process. 1. Gypsum fiber board produced in a Siempelkamp process , comprising 75 wt % to 90 wt % , relative to the total dry mix , of calcium sulfate hemi-hydrate and 10 wt % to 25 wt % , relative to the total dry mix , paper fibers , wherein the calcium sulfate hemi-hydrate is a mixture of α-calcium sulfate hemi-hydrate and β-calcium sulfate hemi-hydrate , wherein the content of α-calcium sulfate hemi-hydrate is at least 5 wt % , relative to the total calcium sulfate hemi-hydrate.2. Gypsum fiber board according to claim 1 , wherein the content of α-calcium sulfate hemi-hydrate is at least 20 wt % claim 1 , relative to the total calcium sulfate hemi-hydrate claim 1 , in particular claim 1 , about 30 wt % claim 1 , relative to the total calcium sulfate hemi-hydrate.3. Gypsum fiber board according to claim 1 , wherein the content of β-calcium sulfate hemi-hydrate is at least 50 wt % claim 1 , relative to the total calcium sulfate hemi-hydrate claim 1 , in particular claim 1 , about 60 wt % claim 1 , relative to the total calcium sulfate hemi-hydrate.4. Gypsum fiber board according to claim 1 , further comprising retardant claim 1 , in particular claim 1 , citric acid.5. Gypsum fiber board according to claim 1 , further comprising an accelerator claim 1 , in particular claim 1 , dihydrate.6. Gypsum fiber board according to claim 1 , wherein the board has a thickness ...

METHOD FOR PRODUCING AGGREGATE AND CALCIUM CARBONATE FROM CONCRETE COMPOSITE MATERIALS, AND A DEVICE FOR CARRYING OUT SAID METHOD

The invention relates to a method for producing aggregate and calcium carbonate from concrete aggregate, and a device for carrying out said method. 1. A method for producing aggregate materials and calcium carbonate from concrete aggregate , said method comprising the following steps:introducing bulk material comprising concrete aggregate into a reaction chamber;feeding a gas comprising carbon dioxide into the reaction chamber;comminuting the bulk material in the reaction chamber;allowing the concrete aggregate and the gas comprising carbon dioxide to react with one another to form reaction products in the reaction chamber;moving the bulk material through a water bath during the comminution and the reaction period; andremoving the reaction products from the reaction chamber.2. The method according to claim 1 , wherein the bulk material and the gas comprising carbon dioxide are conducted through the reaction chamber in opposite directions.3. The method according to claim 1 , wherein the concrete aggregate of the bulk material and the gas comprising carbon dioxide are left to react with one another so as to form reaction products at a temperature in a temperature range from 60 to less than 90° C.4. The method according to claim 1 , wherein a combustion gas comprising carbon dioxide is fed to the reaction chamber.5. The method according to claim 1 , wherein the bulk material is saturated with water during the comminution and the reaction period claim 1 , such that the concrete aggregate is saturated with water to an extent of at least 90% in relation to the mass of water necessary for complete saturation of the concrete aggregate with water.6. The method according to claim 1 , wherein the bulk material comprises concrete aggregate to an extent of at least 90 mass % in relation to the mass of the bulk material.7. The method according to claim 1 , wherein the concrete aggregate is formed from hardened cement paste and aggregate.8. The method according to claim 1 , ...

Gypsum composition, gypsum slurry, gypsum hardened body, gypsum-based building material, gypsum board, and manufacturing method for a gypsum-based building material

A gypsum composition includes a calcined gypsum and a starch urea phosphate.

GYPSUM PANELS, SYSTEMS, AND METHODS

Gypsum panels, sheathing systems, and methods of making and using the same are provided. A gypsum panel includes a gypsum core associated with a first fiberglass mat having a continuous barrier coating, the coating penetrating a portion of the first fiberglass mat opposite the gypsum core, wherein gypsum penetrates a remaining fibrous portion of the first fiberglass mat such that voids in the first fiberglass mat are substantially eliminated. A building sheathing system includes at least two gypsum panels and a seaming component to provide a seam at an interface between the gypsum panels. 1. A building sheathing system , comprising:at least two gypsum panels; anda seaming component configured to provide a seam at an interface between at least two of the gypsum panels, the system passes a hydrostatic head test against water leakage, as measured by AATCC 127-2008,', 'the system displays no water leaks when measured according to ICC Evaluation Service Acceptance Criteria 212,', 'the system passes ICC Evaluation Service Acceptance Criteria 310, and/or', 'the system displays no water leaks when measured according to ASTM E331 wall assembly test., 'wherein2. The building sheathing system of claim 1 , wherein each gypsum panel comprises a gypsum core associated with a first fiberglass mat having a continuous barrier coating claim 1 , the coating penetrating a portion of the first fiberglass mat opposite the gypsum core claim 1 ,wherein gypsum of the gypsum core penetrates a remaining fibrous portion of the first fiberglass mat such that voids in the first fiberglass mat are substantially eliminated.3. The building sheathing system of claim 1 , wherein the seaming component comprises tape or a bonding material.4. The building sheathing system of claim 3 , wherein the seaming component comprises a bonding material selected from the group consisting of synthetic stucco plasters claim 3 , cement plasters claim 3 , synthetic acrylics claim 3 , sand-filled acrylics claim 3 , ...

GYPSUM PANELS, SYSTEMS, AND METHODS

Gypsum panels and methods for their manufacture are provided herein. The gypsum panels include a gypsum core having a first surface and a second opposed surface and a first fiberglass mat associated with the first surface of the gypsum core, such that gypsum from the gypsum core penetrates at least a portion of the first fiberglass mat. 1. A method of making a gypsum panel , comprising:depositing a first gypsum slurry onto a first surface of a first fiberglass mat, such that the first gypsum slurry penetrates at least a portion of the first fiberglass mat; andallowing the first gypsum slurry to set to form at least a portion of a gypsum core,wherein the first gypsum slurry comprises a wetting agent in an amount effective to reduce a surface tension of the first gypsum slurry.2. The method of claim 1 , wherein the first gypsum slurry comprises the wetting agent in an amount effective to bring a slurry surface tension of the first gypsum slurry to from about 30 dyne/cm to about 60 dyne/cm.3. The method of claim 1 , wherein the wetting agent comprises a surfactant having a boiling point of 200° C. or lower.4. The method of claim 3 , wherein the surfactant comprises a multifunctional agent based on acetylenic chemistry or an ethoxylated low-foam agent.5. The method of claim 3 , wherein the surfactant is present in the first gypsum slurry in an amount of about 0.01 percent to about 1 percent claim 3 , by weight.6. The method of claim 1 , wherein the first gypsum slurry is deposited in an amount of from about 5 percent to about 20 percent claim 1 , by weight claim 1 , of the gypsum core.7. The method of claim 1 , further comprising applying a continuous barrier coating to a second surface of the first fiberglass mat opposite the gypsum core claim 1 , the continuous barrier coating penetrating a portion of the first fiberglass mat claim 1 , to define a remaining portion of the first fiberglass mat claim 1 , wherein gypsum from the gypsum core penetrates the remaining ...

Gypsum Based Formulations

The formulation for making plasterboard with paper cover sheets comprises finely divided gypsum, a minor amount by weight of starch and, as crosslinking agent for the starch, a tri-functional reactive s-triazine having substituents at positions 2, 4 and 6 of the triazine ring which are reactive with the starch. A preferred crosslinking agent is 2,4,6-trichloro-s-triazine, which is preferably partially reacted with the starch before further reaction with the paper cover sheets for the plaster board. 1. A gypsum formulation , which comprises finely divided gypsum , a minor amount by weight of starch and , as crosslinking agent for the starch , a trifunctional reactive s-triazine having substituents at positions 2 , 4 and 6 of the triazine ring which are reactive with the starch , wherein the crosslinking agent is partially reacted with the starch prior to mixing with the gypsum.2. A method of producing plaster , which comprises mixing in water a finely divided gypsum , starch in a minor amount relative to the gypsum , and , as crosslinking agent for the starch , a tri-functional reactive s-triazine having substituents at positions 2 , 4 and 6 of the triazine ring which are reactive with the starch , so as to form a slurry , and allowing the slurry to set.3. A method according to claim 2 , wherein the crosslinking agent is 2 claim 2 ,4 claim 2 ,6-trichloro-s-triazine.4. A method according to claim 2 , wherein the slurry is fed between spaced surface reinforcements so as to form a sandwich structure and the slurry is allowed to set between the surface reinforcements.5. A method according to claim 4 , wherein the surface reinforcements are of paper.6. A method according to claim 2 , wherein the slurry is allowed to set at a temperature of at least 50° C.7. A plaster board claim 2 , comprising: a first cover sheet; a second cover sheet; and a core disposed between the first and second cover sheets claim 2 , the core comprising calcium sulphate dihydrate claim 2 , and a ...

FIRE CORE COMPOSITIONS AND METHODS

The present invention describes an improved building material composition, useful for example as a fire door core and the improved methods of making this composition. More particularly, the building material of the present invention is prepared from hollow microspheres and an aqueous mixture of a cementitious composition containing at least one of the following: a hydraulic cement, an accelerant, or a refractory binder, which composition can be molded and shaped into a fire door core. 1. A composition useful for producing a fire door core comprising a mixture of:(a) a hollow microsphere and (i) a hydraulic cement,', '(ii) an accelerant, or', '(iii) a binder;, '(b) a cementitious composition comprising at least one of the followingwherein the composition can be molded or shaped into a fire door core.2. The composition of claim 1 , wherein the hollow microspheres are selected from the group consisting of: glass claim 1 , ceramic claim 1 , metals claim 1 , plastic claim 1 , and composites.3. The composition of claim 1 , wherein the cementitious composition includes the hydraulic cement claim 1 , and the hydraulic cement is selected from the group consisting of: refractory cement claim 1 , calcium aluminate cement claim 1 , CIMENT FONDU cement claim 1 , Portland cement claim 1 , magnesium based cement claim 1 , gypsum cement claim 1 , cements with a mixture of silicates claim 1 , oxides claim 1 , perlite claim 1 , clay claim 1 , bentonite clay claim 1 , or fire clay claim 1 , and combinations thereof.4. The composition of claim 1 , wherein the cementitious composition includes the accelerant claim 1 , and the accelerant is selected from the group consisting of: alkali metal halides claim 1 , alkali metal nitrites claim 1 , alkali metal nitrates claim 1 , alkali metal formates claim 1 , alkali metal thiocyanates claim 1 , calcium chloride claim 1 , non-calcium chloride claim 1 , calcium carbonate claim 1 , calcium hydroxide claim 1 , triethanol amine claim 1 , sodium ...

Method for producing a gypsum plasterboard

A method for producing a gypsum plasterboard comprising the steps of providing bundler dust obtained from gypsum plasterboard leftovers of a plasterboard trimming process by a trimming device, in particular by a bundler saw; and adding at least a part of the bundler dust to a gypsum slurry for producing the gypsum plasterboard.

Processes for the Production of Citric Acid

The present application pertains to methods for making metal oxides and/or citric acid. In one embodiment, the application pertains to a process for producing calcium oxide, magnesium oxide, or both from a material comprising calcium and magnesium. The process may include reacting a material comprising calcium carbonate and magnesium carbonate. Separating, concentrating, and calcining may lead to the production of oxides such as calcium oxide or magnesium oxide. In other embodiments the application pertains to methods for producing an alkaline-earth oxide and a carboxylic acid from an alkaline earth cation—carboxylic acid anion salt. Such processes may include, for example, reacting an alkaline-earth cation—carboxylic acid anion salt with aqueous sulfur dioxide to produce aqueous alkaline-earth—bisulfite and aqueous carboxylic acid solution. Other useful steps may include desorbing, separating, and/or calcining.

Asymmetrical Laminate Panel and Method of Manufacture

The present disclosure relates generally to plaster wall panels, for example, suitable for covering interior wall frames. The present disclosure relates more particularly to a plaster wall panel including a first plaster layer, a second plaster layer, and a damping layer disposed between the first and second plaster layers. The first plaster layer has a first thickness and is composed of a first plaster material that has a first material property. The second plaster layer has a second thickness and is composed of a second plaster material that has a second material property. The first thickness is smaller than the second thickness, and the first and second material properties are different. 1. A plaster wall panel comprising:a first plaster layer having a first thickness and being composed of a first plaster material having a first material property;a second plaster layer having a second thickness and being composed of a second plaster material having a second material property, wherein the first thickness is smaller than the second thickness and wherein the first and second material properties are different; anda damping layer disposed between the first plaster layer and the second plaster layer.2. The plaster wall panel according to claim 1 , wherein at least one of the first plaster material and second plaster material comprises a base material that is a gypsum material.3. The plaster wall panel according to claim 1 , wherein at least one of the first plaster material and second plaster material comprises a base material that is lime or a cement.4. The plaster wall panel according to claim 1 , wherein the first thickness is in a range from 3% to 75% of the second thickness.5. The plaster wall panel according to claim 1 , wherein the elastic modulus of the first plaster material is in a range from 150% to 1000% of the elastic modulus of the second plaster material.6. The plaster wall panel according to claim 1 , wherein the density of the first plaster material is ...

COMPOSITE STRUCTURE FOR APPLYING TILES TO A SURFACE, AND SYSTEMS AND METHODS OF USING SAME

A composite structure for use in tiling surfaces is disclosed. The composite structure can include a fiber matrix impregnated with a water-activated setting material. The composite structure can be wet and then compressed between a tile and an application surface. The composite structure can cure to provide a support surface for the tile. 1. A composite structure having respective upper and lower surfaces , the composite structure comprising:a fiber matrix; anda water-activated setting material, wherein the fiber matrix is impregnated with the water-activated setting material,wherein the composite structure is deformable prior to setting of the water-activated setting material so that the bottom surface of the composite structure conforms to an underlying application surface.2. The composite structure of claim 1 , wherein the composite structure has an uncompressed thickness between two millimeters and twenty millimeters.3. The composite structure of claim 1 , wherein the fiber matrix comprises a nonwoven material.4. The composite structure of claim 3 , wherein the nonwoven material comprises a nonwoven batt comprising fibers having a denier ranging from 4 to 150 claim 3 , wherein the fibers are positioned in an open pattern.5. The composite structure of claim 3 , wherein the fiber matrix comprises fibers in a velour pattern.6. The composite structure of claim 3 , wherein the fiber matrix comprises at least one of a melamine sponge claim 3 , a three-dimensional spunbond claim 3 , a three-dimensional woven fabric claim 3 , or a three-dimensional knitted fabric.7. The composite structure of claim 1 , wherein the water-activated setting material comprises Portland cement or gypsum.8. The composite structure of claim 1 , wherein the water-activated setting material is configured to set within five to ninety minutes of application of water to the water-activated setting material.9. The composite structure of claim 1 , wherein the composite structure has an uncompressed ...

LIGNIN DERIVATIVE COMPOUND AND USE THEREOF

From the viewpoint of a decrease in environmental impact in recent years, an object of the present invention is to effectively utilize lignin as a circulative biomass resource having high effect of reducing environmental impact. Specifically, the object is to provide a lignin derivative that can improve the dispersibility of various substances to be dispersed regardless of uses of cements, dyes, oil field drilling mud, and the like. The present invention provides a lignin derivative compound that is a reaction product of a lignin sulfonic acid-based compound with an aromatic water-soluble compound, and a dispersant containing the same. The lignin derivative compound preferably has an anionic functional group and/or a polyalkylene oxide chain. 1. A lignin derivative compound that is a reaction product of a lignin sulfonic acid-based compound with an aromatic water-soluble compound.2. The lignin derivative compound according to claim 1 , having an anionic functional group.3. The lignin derivative compound according to claim 1 , having a polyalkylene oxide chain with an average addition molar number of an alkylene oxide of 25 or more.4. The lignin derivative compound according to claim 1 , wherein a reaction weight ratio ([L]/[M]) of the lignin sulfonic acid-based compound [L] and the aromatic water-soluble compound [M] is 1 to 99/99 to 1.5. The lignin derivative compound according to claim 1 , wherein the aromatic water-soluble compound comprises at least one selected from the group consisting of an aromatic compound having a polyalkyleneoxide chain claim 1 , an aromatic compound having a carboxyl group claim 1 , and an aromatic compound having a sulfo group.6. The lignin derivative compound according to claim 1 , wherein the aromatic water-soluble compound has a reaction rate of 50% or more.7. A dispersant comprising the lignin derivative compound according to .8. The dispersant according to claim 7 , which is a hydraulic composition dispersant.9. The dispersant ...

Method for the Production of Gypsum-Based Boards and Stucco Slurry Comprising Non-Pregelatinized Migratory Starch for Use Therewith

A method for continuously forming gypsum-based panels of high fixing strength comprises the steps of: •forming a mixture comprising stucco, non-pregelatinized migratory starch, glass fibre, fluidizer and water; •casting the mixture in a continuous band; •maintaining the band under conditions sufficient for the stucco to form an interlocking matrix of set gypsum; •cutting the band to form one or more wet panel precursors; and •drying the wet panel precursor to form one or more gypsum-based panels. •The weight ratio of water to stucco in the mixture is less than 0.7; •the stucco is present in the mixture in an amount of over 60 wt % relative to the total solids content of the mixture; •the starch is present in the mixture in an amount of over 3 wt % relative to the the stucco; •the glass fibre is present in the mixture in an amount of over 1 wt % relative to the stucco; •the fluidizer is is present in the mixture in an amount of at least 0.1 wt % relative to the stucco; and the density of the gypsum-based panel is greater than 700 kg/m. 112-. (canceled)13. A panel having a gypsum-based core that comprises a gypsum matrix having embedded therein a migratory starch in an amount of at least 3 wt % relative to the gypsum and glass fibre in an amount of at least 1 wt % relative to the gypsum , the panel having a maximum dimension greater than 1 m , wherein the density of the gypsum-based core is greater than 700 kg/m , and the amount of gypsum in the gypsum-based core is greater than 60 wt % , and further wherein the total volume of water voids in the gypsum-based core is less than the total volume of the gypsum in the panel core.14. The panel according to claim 13 , formed by a continuous method comprising:forming a mixture comprising stucco, migratory starch, glass fibre and water;casting the mixture in a continuous band;maintaining the band under conditions sufficient for the stucco to form an interlocking matrix of set gypsum;cutting the band to form one or more wet ...

LIGHT WEIGHT GYPSUM WALLBOARD

The invention generally provides gypsum-containing slurries including stucco, naphthalenesulfonate dispersant, and pregelatinized starch. The naphthalenesulfonate dispersant is present in an amount of about 0.1% -3.0% by weight based on the weight of dry stucco. The pregelatinized starch present in an amount of at least about 0.5% by weight up to about 10% by weight of pregelatinized starch by weight based on the weight of dry stucco in the formulation. Other slurry additives can include trimetaphosphate salts, accelerators, binders, paper fiber, glass fiber, and other known ingredients. The invention also comprises the gypsum-containing products made with such slurries, for example, gypsum wallboard, and a method of making gypsum wallboard. 130-. (canceled)31. A light weight gypsum board comprising:a set gypsum composition disposed between two cover sheets, the set gypsum composition formed from at least water, stucco, pregelatinized starch, and foaming agent;the pregelatinized starch is in an amount from about 0.5% to about 10% by weight based on the weight of the stucco;the foaming agent comprises a major weight portion of unstable component and a minor weight portion of stable component, the amount of foaming agent and the weight ratio of said unstable component to stable component effective to form a void distribution within the set gypsum composition; andthe set gypsum composition comprises a continuous crystalline matrix substantially of calcium sulfate dihydrate, the board having a density of about 34 pcf or less, the pregelatinized starch is effective to increase the core hardness of the board relative to the board without the pregelatinized starch, and the board having a core hardness of at least about 11 lb, the core hardness determined according to ASTM standard C473.32. A light weight gypsum board comprising:a set gypsum composition disposed between two cover sheets, the set gypsum composition formed from at least water, stucco, pregelatinized starch, ...

Composition for plasterboards and products obtained

The invention relates to a plaster-based composition comprising nanometric boehmite and/or nanometric aluminium trihydroxide, this composition making it possible to obtain products having better dimensional stability at high and in particular at very high temperature. The invention also relates to the method of obtaining the products, and the products produced.

MIXING AND STIRRING DEVICE, MIXING AND STIRRING METHOD, AND METHOD FOR MANUFACTURING LIGHTWEIGHT GYPSUM BOARD

Turning motion of gypsum slurry spouting onto a sheet of paper for a gypsum board liner is restricted for preventing maldistribution, deviation or irregular dispersion from occurring in the density distribution of the slurry on the sheet of paper. A mixing and stirring device for gypsum slurry has a circular casing forming a mixing area, a rotary disc positioned in the casing, and a tubular passage for feeding the slurry onto the sheet of paper for gypsum board liner. A chute has a fluid passage portion with its cross section being non-axisymmetric with respect to a center axis of the tubular passage, or a fluid passage portion varying a position of the center axis of the tubular passage by means of change or lateralization of the cross section of fluid passage. 123-. (canceled)24. A mixing and stirring device for gypsum slurry , which has a circular casing forming a mixing area for mixing of the gypsum slurry , a rotary disc positioned in the casing and rotated in a predetermined rotational direction , and a tubular passage for delivery of the gypsum slurry , which is provided outside of the casing in order to feed the slurry of the mixing area onto a sheet of paper for gypsum board liner , and which generates an intratubular swirling flow for mixing the gypsum slurry with foam or foaming agent for adjustment of a specific gravity ,wherein said tubular passage includes a chute which receives the gypsum slurry effluent from the casing through a slurry outlet port provided on the casing and which allows the slurry to flow down gravitationally therein, and a discharge pipe portion connected with an outlet part of said chute for spouting the slurry onto said sheet of paper;wherein said chute has an orifice passage which locally constricts a cross section of an intratubular area of the chute for causing the gypsum slurry and the foam or foaming agent to revolve in the intratubular area; andwherein a centroid of a figure of a cross section of the orifice passage is ...

GYPSUM ADDITIVE TO CONTROL MERCURY

Additives including sulfur-containing compounds are used in methods of treating synthetic gypsum. The additives can thermally stabilize heavy metals, such as mercury. This thermal stabilization reduces mercury release from the synthetic gypsum. Illustrative, non-limiting examples of sulfur-containing compounds include inorganic sulfides, organic sulfides, organic compounds containing nitrogen and sulfur, organic compounds containing oxygen and sulfur, and polymers containing sulfur. 1. A method of treating synthetic gypsum , comprising:transporting the synthetic gypsum from a wet flue gas desulfurizer; andcontacting the synthetic gypsum with an additive, the additive comprising a sulfur-containing compound, wherein the sulfur-containing compound is a polymer comprising sulfur that is modified to contain at least one of a sulfide and a dithiocarbamate salt group.2. The method of claim 1 , wherein the polymer comprising sulfur comprises about 5 mole % to about 100 mole % of dithiocarbamate salt groups.4. The method of claim 1 , wherein the polymer comprising sulfur is formulated with a sulfide precipitant.5. The method of claim 1 , wherein the polymer comprising sulfur is formed by reacting glycidyl (meth)acrylate claim 1 , allyl glycidyl ether or [(vinyloxy)methyl]oxirane with ammonia or a primary amine to form a first product claim 1 , reacting the first product with one or more of acrylic acid claim 1 , vinyl alcohol claim 1 , vinyl acetate claim 1 , acrylamide claim 1 , methylacrylic acid claim 1 , and methylacrylamide to form a second product claim 1 , and reacting the second product with a dithiocarbamic acid salt.6. The method of claim 1 , wherein the additive comprises water.7. The method of claim 1 , wherein the synthetic gypsum is contacted by the additive in a conduit leading to a kiln.8. A method of treating synthetic gypsum claim 1 , comprising:transporting the synthetic gypsum from a wet flue gas desulfurizer; andcontacting the synthetic gypsum with an ...

PENETRATION PART FIREPROOF COATING MATERIAL

A penetration part fireproof covering material used when a penetration part covered for fireproof is formed in a fireproof beam that is a fireproof constructional member that constitutes a wooden building, wherein the penetration part fireproof covering material is formed to have a tubular shape by stacking a plurality of gypsum board pieces () formed from gypsum boards in a thickness direction and unitarily connecting the plurality of gypsum board pieces. The penetration part fireproof covering material is formed to have the tubular shape by stacking the plurality of gypsum board pieces that preferably have an annular shape and are cut out from commercially available gypsum boards having thicknesses of 9.5 mm to 25.5 mm while fixing the plurality of gypsum board pieces to each other preferably using metal fasteners such as staples, and unitarily connecting the plurality of gypsum board pieces. 1. A penetration part fireproof covering material used when a penetration part covered for fireproofing is formed in a wooden building , wherein the fireproof covering material is formed to have a tubular shape by stacking a plurality of gypsum board pieces in a thickness direction and unitarily connecting the plurality of gypsum board pieces.2. The penetration part fireproof covering material according to claim 1 , wherein the plurality of gypsum board pieces are annular gypsum board pieces.3. The penetration part fireproof covering material according to claim 2 , wherein the plurality of gypsum board pieces are cut out from gypsum boards of thicknesses of 9.5 mm to 25.5 mm.4. The penetration part fireproof covering material according to claim 3 , wherein the plurality of gypsum board pieces are stacked and unitarily connected in such a manner that sheets of paper are attached to both sides of each gypsum board piece.5. The penetration part fireproof covering material according to claim 4 , wherein the plurality of gypsum board pieces are stacked and unitarily connected to ...

CALCIUM SULPHATE-BASED PRODUCTS

This invention relates to improved high temperature resistant calcium sulphate-based products e.g. gypsum wallboard products and, in particular, to products having reduced shrinkage at high temperatures. The invention provides calcium sulphate-based product comprising gypsum and a shrinkage resistance additive. The shrinkage resistance additive is melamine polyphosphate or melamine pyrophosphate.

Method of Curing A Gypsum Calcination Product

A method of conditioning stucco comprises the steps of supplying a quantity of stucco particles to a reaction vessel, the stucco particles comprising calcium sulphate hemihydrate and/or calcium sulphate anhydrite, as well as calcium sulphate dihydrate; and conditioning the stucco particles at a temperature of at least 100° C. and a humidity of at least 70%. During the step of conditioning the stucco particles, the bulk density of the stucco particles within the reaction vessel is at least 1 g/cm. 1. A method of conditioning stucco comprising the steps of:supplying a quantity of stucco particles to a reaction vessel, the stucco particles comprising calcium sulphate hemihydrate and/or calcium sulphate anhydrite, as well as calcium sulphate dihydrate; and {'sup': '3', 'wherein during the step of conditioning the stucco particles, the bulk density of the stucco particles within the reaction vessel is at least 1 g/cm.'}, 'conditioning the stucco particles at a temperature of at least 100° C. and a humidity of at least 70%,'}2. A method according to claim 1 , wherein the bulk density of the stucco particles within the reaction vessel is at least 1.5 g/cm.3. A method according to claim 1 , wherein the conditioning time of the stucco particles is at least 30 minutes claim 1 , preferably at least one hour.4. A method according to claim 1 , wherein the conditioning temperature is at least 130° C.5. A method according to claim 1 , wherein the pressure inside the reaction vessel during the step of conditioning the stucco particles is less than 2 bar.6. A method according to claim 1 , wherein the stucco particles supplied to the reaction vessel comprise calcium sulphate anhydrite.7. A method according to claim 6 , wherein the stucco particles supplied to the reaction vessel comprise calcium sulphate anhydrite III.8. A method according to claim 7 , wherein the stucco particles supplied to the reaction vessel comprise calcium sulphate anhydrite III in an amount of up to 70 wt %.9. ...

COMPOSITE GYPSUM BOARD AND METHODS RELATED THERETO

Disclosed is a composite gypsum board comprising a board core and a concentrated layer of substantial thickness (e.g., at least about 0.02 inches). The concentrated layer includes a higher weight percentage of an enhancing additive than the board core. The board core has a thickness greater than the thickness of the concentrated layer and forms the bulk of the board volume. The concentrated layer has a higher density (e.g., at least about 1.1 times greater) than the density of the board core. Also disclosed is a method of preparing a composite gypsum board. 1. A composite gypsum board comprising:(a) a board core comprising set gypsum formed from at least water, stucco, and optionally, an enhancing additive, the core having a dry density and dry thickness, the core defining first and second core faces in opposing relation; and (i) when the enhancing additive is present in forming the core, the enhancing additive is included in a higher concentration in forming the concentrated layer than in forming the board core, and', '(ii) the board core dry thickness is greater than a dry thickness of the concentrated layer., '(b) a concentrated layer formed from at least water, stucco, and the enhancing additive, the concentrated layer disposed in bonding relation to the first core face, the concentrated layer having a dry density of at least about 1.1 times higher than the dry density of the board core; wherein2. The composite gypsum board of claim 1 , wherein:the concentrated layer defines first and second concentrated layer faces,the board further comprises a top cover sheet, the first concentrated layer face facing the top cover sheet, andthe second concentrated layer face faces the first core face.3. The composite gypsum board of claim 1 , wherein the board further comprises a bottom cover sheet claim 1 , the second core face facing the bottom cover sheet.4. The composite gypsum board of claim 3 , wherein the top and/or bottom cover sheet has a thickness of at least about 0 ...

COMPOSITE GYPSUM BOARD AND METHODS RELATED THERETO

Disclosed is a composite gypsum board comprising a board core and a concentrated layer of substantial thickness (e.g., at least about 0.02 inches). The concentrated layer includes a higher weight percentage of an enhancing additive than the hoard core. The board core has a thickness greater than the thickness of the concentrated layer and forms the bulk of the board volume. The concentrated layer has a higher density (e.g., at least about 1.1 times greater) than the density of the board core. Also disclosed is a method of preparing a composite gypsum board. 1. A composite gypsum board comprising:(a) a board core comprising set gypsum formed from at least water, stucco, and optionally, an enhancing additive, the core defining a first core face; and (i) when the enhancing additive is included in forming the board core, the enhancing additive is included in a higher concentration in forming the concentrated layer than in forming the board core,', '(ii) the board core has a thickness greater than the thickness of the concentrated layer, and', '(iii) the concentrated layer has an average core hardness that is at least about 1.5 times greater than the average core hardness of the board core., '(b) a concentrated layer thrilled from at least water, stucco, and the enhancing additive, the concentrated layer disposed in bonding relation to the first core face; wherein2. The composite gypsum board of claim 1 , wherein the concentrated layer is formed from at least about 1.2 times the enhancing additive used in forming the board core.3. The composite gypsum board of claim 1 , wherein the board has a density of about 33 pcf (about 530 kg/m) or less claim 1 , and the board has a nail pull resistance according to ASTM C473-10 claim 1 , Method B of at least about 68 lbs of force.4. The composite gypsum board of claim 1 , wherein the enhancing additive comprises starch.5. The composite gypsum board of claim 4 , wherein the starch comprises a pregelatinized starch having a viscosity ...

Gypsum Panels, Systems, and Methods

Gypsum panels, sheathing systems, and methods of making and using the same are provided. A gypsum panel includes a gypsum core associated with a first fiberglass mat having a continuous barrier coating, the coating penetrating a portion of the first fiberglass mat opposite the gypsum core, wherein gypsum penetrates a remaining fibrous portion of the first fiberglass mat such that voids in the first fiberglass mat are substantially eliminated. A building sheathing system includes at least two gypsum panels and a seaming component to provide a seam at an interface between the gypsum panels. 1. A method of making a gypsum panel , comprising:depositing a gypsum slurry onto a surface of a first fiberglass mat opposite a continuous barrier coating that penetrates a portion of the first fiberglass mat; andallowing the gypsum slurry to set to form a gypsum core,wherein the gypsum slurry penetrates a remaining fibrous portion of the first fiberglass mat such that voids in substantially all of an interstitial volume of the first fiberglass mat that is not filled by the coating are substantially eliminated, andwherein the gypsum panel passes a hydrostatic head test against water leakage, as measured by AATCC 127-2008.2. The method of claim 1 , wherein:depositing the gypsum slurry comprises depositing a first gypsum slurry onto the surface of the first fiberglass mat, the first gypsum slurry having a density of from about 88 pcf to about 98 pcf, andallowing the gypsum slurry to set comprises allowing the first gypsum slurry to set to form at least a portion of the gypsum core.3. The method of claim 2 , wherein the first gypsum slurry comprises a wetting agent in an amount effective to reduce a surface tension of the first gypsum slurry to from about 30 dyne/cm to about 55 dyne/cm.4. The method of claim 3 , wherein the wetting agent is selected from a group consisting of surfactants claim 3 , superplasticisers claim 3 , dispersants claim 3 , agents containing surfactants claim 3 ...

IMPROVEMENT OF STUCCO PROPERTIES THROUGH AGING AT ELEVATED TEMPERATURES AND HIGH HUMIDITY LEVEL

The invention pertains to a method for stabilizing stucco wherein 1. Method for stabilizing stucco whereina fresh stucco is provided;water is added to the fresh stucco to obtain moistened stucco, andthe moistened stucco is maintained at a temperature of at least 30° C. for a time interval of at least 30 min to obtain a stabilized stucco.2. Method according to claim 1 , wherein water is added to the fresh stucco in an amount such that the stabilized stucco contains free moisture in an amount of 0.2 to 5 wt. % claim 1 , preferably of 0.5 to 1.5 wt. % based on the weight of the stabilized stucco.3. Method according to claim 1 , wherein the water is provided in vapor form.4. Method according to claim 1 , wherein the fresh stucco is provided at room temperature.5. Method according to claim 1 , wherein the fresh stucco is heated to a temperature of at least 30° C. before addition of water.6. Method according to claim 1 , wherein the moistened stucco is maintained under an atmosphere of at least 50% rel. humidity.7. Method according to claim 1 , wherein the moistened stucco is maintained at a temperature of at least 40° C. for a time period of less than 48 hours.8. Method according to claim 1 , wherein a particle size D98 of the stabilized stucco is adjusted to less than 1 mm.9. Method according to claim 1 , wherein the stabilized stucco is ground.10. Method according to claim 1 , wherein the stabilized stucco is mixed with fresh stucco.11. Method for producing gypsum plasterboards claim 1 , at least comprising the following steps:providing a stabilized stucco;preparing a stucco slurry by addition of water to the stabilized stucco;forming the stucco slurry to obtain a gypsum plasterboard.12. Method according to claim 11 , wherein a foam is added to the stucco slurry.13. Method according to claim 12 , wherein the foam is unstable foam.14. Method according to claim 12 , wherein the foam is stable foam and a defoamer is added to the stucco slurry.15. Use of stabilized stucco ...

Calcination method and system

The invention relates to a method for the calcination of powdery or fine-particled plaster, comprising two steps: the plaster is subjected to a flash-calcination in a calcinator (3) and the hot plaster is post-calcinated in a reaction vessel (6). According to the invention, post-calcination is carried out in the reaction vessel (6) by adding humid gas, said reaction vessel (6) not being heated. Said post-calcination takes place over a long period of time, that is at least 10 times, preferably 50 - 100 times longer than the amount of time taken for flash calcination. Said invention enables complete calcination to take place without expending additional energy, and the remaining dihydrate produced during the flash calcination is also transformed into semi-hydrate and undesired anhydrite fractions are reduced. Said method ensures consistency in the product quality and also increases product quality. The temperature in the upstream calcinator (3) can be lowered thus saving more energy. Said invention can also be used to accelerate the ageing of calcinated plaster.

Method and apparatus for stabilizing plaster

High temperature sag resistant lightweight gypsum board

A high temperature sag resistant lightweight wallboard. The addition of a small amount of urea (about 0.1%) significantly improves the high-temperature sag resistance on Type X gypsum wallboards. These gypsum wallboards may have a board weight of less than 2100 lbs/msf when cast to have an overall 5.8 inch thickness, and may include glass fibers and/or mineral wool. Also, methods of making the gypsum wallboard and a wall system for employing the gypsum wallboard.

PROCESS TO MAKE CALCIUM OXIDE OR ORDINARY PORTLAND CEMENT FROM CALCIUM BEARING ROCKS AND MINERALS

Aspects of the invention include a method of producing a cement material comprising step of: first reacting a calcium-bearing starting material with a first acid to produce an aqueous first calcium salt; second reacting the aqueous first calcium salt with a second acid to produce a solid second calcium salt; wherein the second acid is different from the first acid and the second calcium salt is different from the first calcium salt; and thermally treating the second calcium salt to produce a first cement material. Preferably, but not necessarily, during the second reacting step, reaction between the first calcium salt and the second acid regenerates the first acid. 1. A method comprising: the calcium-bearing starting material has a chemical composition comprising a plurality of metal elements including at least Ca and Si;', 'the one or more solid byproducts comprises a silicon compound;, 'first reacting a calcium-bearing starting material with a first acid to produce a first aqueous fraction comprising an aqueous first calcium salt and a first solid fraction comprising one or more solid byproducts; whereinseparating the first aqueous fraction from the first solid fraction; andtreating the first calcium salt to produce a first cement material.2. The method of claim 1 , wherein the calcium-bearing starting material comprises at least one multinary metal oxide material having a composition comprising Ca and at least one other metal element selected from the group consisting of Al claim 1 , Si claim 1 , Fe claim 1 , Mn claim 1 , and Mg.3. The method of claim 1 , wherein the calcium-bearing starting material comprises at least one natural rock or mineral comprising basalt claim 1 , igneous appetites claim 1 , wollastonite claim 1 , anorthosite claim 1 , montmorillonite claim 1 , bentonite claim 1 , calcium-containing feldspar claim 1 , anorthite claim 1 , diopside claim 1 , pyroxene claim 1 , pyroxenite claim 1 , mafurite claim 1 , kamafurite claim 1 , clinopyroxene ...

Способ изготовления смеси альфа и бета штукатурного гипса очень низкой консистенции

Изобретение может быть использовано в производстве строительных материалов. Способ изготовления продукта, содержащего альфа полугидрат сульфата кальция и бета полугидрат сульфата кальция, включает подачу 50-75 мас.% гипсовой суспензии в первый реактор, причем суспензия содержит дигидрат сульфата кальция и воду, и кальцинацию суспензии в реакторе при условиях, достаточных для образования частично кальцинированной суспензии, содержащей воду, дигидрат сульфата кальция и альфа полугидрат сульфата кальция. Суспензию выдерживают в первом реакторе при условиях кальцинации гипса до преобразования от 50 до 95% гипса в альфа полугидрат сульфата кальция. Затем добавляют по меньшей мере один модификатор роста кристаллов к дигидрату сульфата кальция и воде перед указанной кальцинацией в первом реакторе. Далее обезвоживают частично кальцинированную суспензию с образованием водного потока и обезвоженной твердой фазы, включающей дигидрат сульфата кальция и альфа полугидрат сульфата кальция. Обезвоженную твердую фазу подают во второй реактор и кальцинируют для преобразования по меньшей мере части дигидрата сульфата кальция обезвоженной твердой фазы в бета полугидрат сульфата кальция. Кальцинацию обезвоженной твердой фазы осуществляют в гипсоварочном котле, работающем при атмосферном давлении и температуре от 66 до 538°C. Изобретение позволяет снизить консистенцию штукатурного гипса. 16 з.п. ф-лы, 4 ил., 4 табл., 3 пр. РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 458 014 (13) C2 (51) МПК C04B 11/02 (2006.01) C01F 11/46 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (72) Автор(ы): Ю Кьянг (US), ЛИНН Майкл Р. (US), СОНГ Вейксин Дэвид (US), ЛИУ Кингксья (US), КЛАУД Майкл Ли (US) (21)(22) Заявка: 2009110959/05, 22.08.2007 (24) Дата начала отсчета срока действия патента: 22.08.2007 (43) Дата публикации заявки: 10.11.2010 Бюл. № 31 (73) Патентообладатель(и): Юнайтед Стэйтс Джипсам Компани (US) 2 4 5 8 0 1 4 (45) Опубликовано: 10.08.2012 Бюл. № 22 ...

Organomineral modifier for gypsum compositions and radioprotective articles based thereon

FIELD: construction. SUBSTANCE: invention relates to construction materials, specifically to additives used in making gypsum compositions and radioprotective articles based thereon. Disclosed is an organomineral modifier for gypsum compositions and radioprotective articles based thereon, which includes a hydraulic binder, an active mineral component, a plasticising additive and a setting time regulator, as an active mineral component, it contains metakaolin, as a plasticising additive - an aqueous solution of Glenium Ace 430 polycarboxylate ester, Best-SPl superplasticizer and further contains an aqueous emulsion of Octyltriethoxysilane Penta-818 and ground schungite with the following content of components, wt. %: hydraulic binder 35.81–55.79, metakaolin 7.16–11.16, aqueous solution of polycarboxylate ester "Glenium Ace 430" 2.69–4.18, super-plasticizer "Best-SPL" 0.45–0.7, water emulsion octyltriethoxysilane "Penta-818" 0.18–0.28, ground schungite 27.89–53.71, wherein the degree of shungite grinding is 200–300 m 2 /kg, metakaolin hydraulic activity is not less than 1200 mg/g. EFFECT: technical result obtained by using the invention is to extend the setting time of the gypsum mixture, giving it self-sealing ability, increase the strength and water resistance of products based on gypsum binder while simplifying the technology of their production and giving them radioprotective properties. 1 cl, 1 dwg, 1 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) (19) RU (11) (13) 2 710 643 C2 (51) МПК C04B 11/00 (2006.01) C04B 28/14 (2006.01) C04B 24/26 (2006.01) G21F 1/04 (2006.01) C04B 111/20 (2006.01) C04B 111/27 (2006.01) C04B 111/62 (2006.01) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C04B 11/00 (2019.05); C04B 28/14 (2019.05); C04B 24/26 (2019.05); G21F 1/04 (2019.05); C04B 2111/27 (2019.05); C04B 2111/62 (2019.05); C04B 2111/20 (2019.05) (21)(22) Заявка: 2018117985, 15.05.2018 15.05.2018 Дата регистрации: 30.12.2019 ...

Method for continuous modification of gypsum dihydrate and modified gypsum dihydrate obtained using said method

FIELD: chemistry. SUBSTANCE: invention can be used in the production of building materials. The method of modifying gypsum dihydrate involves a step of forming a semihydrate on which crude gypsum dihydrate is calcined to gypsum semihydrate, and recrystallisation step on which the gypsum semihydrate is hydrated and recrystallised in an aqueous suspension to modified gypsum dihydrate. At the recrystallisation step, the aqueous suspension is held in the reaction vessel at constant temperature while stirring such that the aqueous suspension becomes homogeneous. Feeding of the gypsum semihydrate and outputting the recrystallised and modified gypsum dihydrate is carried out continuously or intermittently. EFFECT: invention enables to obtain modified gypsum dihydrate, having mean particle size of at least 64 mcm and purity of 95% or higher. 16 cl, 5 dwg, 2 tbl, 17 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 472 706 (13) C2 (51) МПК C01F 11/46 (2006.01) C04B 11/02 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2011102297/05, 31.07.2009 (24) Дата начала отсчета срока действия патента: 31.07.2009 (73) Патентообладатель(и): ЙОСИНО ГИПСУМ КО., ЛТД. (JP) (43) Дата публикации заявки: 10.09.2012 Бюл. № 25 2 4 7 2 7 0 6 (45) Опубликовано: 20.01.2013 Бюл. № 2 (56) Список документов, цитированных в отчете о поиске: JP 2008-081329 A, 10.04.2008. JP 2006273599 A, 12.10.2006. JP 2002-029740 A, 29.01.2002. JP 2006-143503 A, 08.06.2006. RU 2101252 C1, 10.01.1998. 2 4 7 2 7 0 6 R U (86) Заявка PCT: JP 2009/063666 (31.07.2009) C 2 C 2 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 28.02.2011 (87) Публикация заявки РСТ: WO 2010/013807 (04.02.2010) Адрес для переписки: 191186, Санкт-Петербург, а/я 230, "АРСПАТЕНТ", пат. пов. В.В.Дощечкиной, рег.№ 869 (54) СПОСОБ НЕПРЕРЫВНОЙ МОДИФИКАЦИИ ДИГИДРАТА ГИПСА И МОДИФИЦИРОВАННЫЙ ДИГИДРАТ ГИПСА, ПОЛУЧЕННЫЙ ЭТИМ СПОСОБОМ (57) Реферат: Изобретение может быть использовано в ...

煅烧方法和煅烧设备

本发明涉及一种用于煅烧粉末状或者微小颗粒状石膏的方法，具有两个步骤：在煅烧研磨机(3)中对石膏快速煅烧和在反应容器(6)中对热石膏再煅烧。根据本发明设计如下，即反应容器(6)中的再煅烧在加入潮湿气体的条件下完成，在此不对反应容器(6)进行加热。再煅烧经过很长的停留时间完成，该停留时间至少10倍于，优选50到100倍于快速煅烧时的停留时间。本发明在没有额外能源消费下实现了煅烧的完成，在此额外地在快速煅烧时进一步将存留的二水合物转化为半水化物而减小了不期望的硬石膏成分。由此既实现了产品质量的标准化也实现了产品质量的提高。可以降低位于前面的煅烧研磨机(3)的温度，这使额外的节约能源成为可能。本发明也可以用于加速煅烧后石膏的老化。

PROCESS FOR MANUFACTURING ULTRA LOW CONSISTENCY α- AND β-BLEND STUCCO

알파 칼슘 설페이트 반수화물을 제조하는 슬러리 하소 단계와 그 이후에 베타 칼슘 설페이트 반수화물을 제조하는 유동층 하소 단계를 포함하는 알파- 및 베타-스터코의 블렌드를 제조하는 방법이 개시된다. 상기 방법은 50~75%의 석고 함유 고형분 슬러리로 개시되며, 그 이후에 증기가 상기 슬러리를 제1 반응기에서 하소하여 칼슘 설페이트 이수화물과 알파 칼슘 설페이트 반수화물을 함유하는 부분적으로 하소된 석고 슬러리를 형성한다. 이후 상기 부분적으로 하소된 슬러리는 탈수된다. 다음으로 여과 케이크는 케틀로 투입되어 상기 여과 케이크 물질의 칼슘 설페이트 이수화물이 베타 칼슘 설페이트 반수화물로 변환됨으로써 상기 하소 공정이 완료된다. Disclosed is a process for preparing a blend of alpha-and beta-starcho comprising a slurry calcination step to produce alpha calcium sulfate hemihydrate and a fluid bed calcination step to produce beta calcium sulfate hemihydrate thereafter. The process starts with a gypsum-containing solid slurry of 50-75%, after which the steam is calcined in a first reactor to form a partially calcined gypsum slurry containing calcium sulfate dihydrate and alpha calcium sulfate hemi-hydrate . The partially calcined slurry is then dehydrated. Next, the filtration cake is put into a kettle, and the calcium sulfate dihydrate of the filtration cake material is converted into beta- calcium sulfate hemi-hydrate, thereby completing the calcination process.

칼슘 설페이트 반수화물 처리 공정

본 발명은 베타 칼슘 설페이트 반수화물(beta calcium sulfate hemihydrate)을 처리하는 공정에 관한 것이다. 상기 공정은 베타 칼슘 설페이트 반수화물을 대기압 이상의 압력에서 스팀에 노출시키는 단계를 포함한다. 석고, 베타 칼슘 설페이트, 반수화물, 물 요구량

Multi-tube rotary heat exchanger

FIELD: heat engineering.SUBSTANCE: invention relates to the field of heat engineering, it can be used in rotary heat exchangers. Multi-tube rotary heat exchanger (1) has stationary protective unit (20). The specified protective unit is located in the close proximity of tube board (8, 9) outside heating or cooling area (D). Fixed plane (30) of the specified protective unit is located opposite and in close proximity to end hole (2a, 2b) of heat exchange tube (2), which moves in upper zone (α) of the specified heating or cooling area, thereby briefly reducing or limiting the specified flow rate of the specified heat carrier fluid passing through the specified heat exchange tube, which moves in the specified upper zone.EFFECT: increased energy or thermal efficiency of the heat exchanger by reducing or limiting the flow rate of the heat carrier fluid passing through the heat exchange tube.20 cl, 15 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 749 019 C1 (51) МПК F28D 11/04 (2006.01) F27B 7/36 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК F28D 11/04 (2021.02); F27B 7/36 (2021.02) (21)(22) Заявка: 2020135053, 15.03.2019 (24) Дата начала отсчета срока действия патента: (73) Патентообладатель(и): ЙОСИНО ДЖИПСУМ КО., ЛТД. (JP) Дата регистрации: 03.06.2021 02.04.2018 JP 2018-070578 (45) Опубликовано: 03.06.2021 Бюл. № 16 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 02.11.2020 (86) Заявка PCT: 2 7 4 9 0 1 9 R U (87) Публикация заявки PCT: WO 2019/193957 (10.10.2019) C 1 C 1 JP 2019/011011 (15.03.2019) 2 7 4 9 0 1 9 (56) Список документов, цитированных в отчете о поиске: WO 2017135250 A1, 10.08.2017. JP 5462549 B2, 02.04.2014. JP 2017058053 A, 23.03.2017. RU 2282795 C1, 27.08.2006. Приоритет(ы): (30) Конвенционный приоритет: R U 15.03.2019 (72) Автор(ы): ЙОСИДА, Томонори (JP), ТАКЕНАКА, Такеси (JP) Адрес для переписки: 129090, Москва, ул. Б. Спасская, 25, стр. 3, ООО "Юридическая фирма Городисский и ...

Organomineral modifier for gypsum binding materials and radioprotective articles based thereon

FIELD: chemistry. SUBSTANCE: invention relates to construction materials, specifically to additives used in making gypsum binder and articles based thereon with radioprotective properties. Organomineral modifier enables to create self-packing mixtures and use a semi-dry method of producing articles based on gypsum binder with molding method of their molding. Organomineral modifier for gypsum binding materials and radioprotective articles based thereon, which includes a hydraulic binder, an active mineral component, a plasticising additive and a setting time regulator, as an active mineral component, it contains metakaolin, as a plasticising additive - Odolit-K polycarboxylate ester, as a regulator of setting time - Best-SPl superplasticizer, and additionally contains Ethyl silicate-40 homogeneous mixture of oligoethoxysiloxanes and ground schungite at the following content of components, wt. %: Hydraulic binder 35.7–55.6, metakaolin 7.2–11.1, Odolit-K polycarboxylate ether 2.7–4.2, Best-SPl superplasticizer 0.6–1 homogeneous mixture of oligoethoxysiloxanes Ethyl silicate-40 0.2–0.3, ground schungite 27.8–53.6, wherein the degree of shungite grinding is 200–300 m 2 /kg, metakaolin hydraulic activity is not less than 1200 mg/g. EFFECT: technical result is obtaining an organomineral modifier for low-quality semi-aqueous gypsum binder and articles based thereon, which increases their compressive strength, water resistance, as well as imparting radioprotective properties to them. 1 cl, 1 dwg, 1 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) (19) RU (11) (13) 2 710 647 C2 (51) МПК C04B 11/00 (2006.01) C04B 28/14 (2006.01) C04B 24/26 (2006.01) G21F 1/04 (2006.01) C04B 111/20 (2006.01) C04B 111/62 (2006.01) C04B 111/27 (2006.01) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C04B 11/00 (2019.05); C04B 28/14 (2019.05); G21F 1/04 (2019.05); C04B 24/26 (2019.05); C04B 2111/20 (2019.05); C04B 2111/27 (2019.05); C04B 2111/62 (2019.05) (21)(22) Заявка ...

Quick-hardening cement concrete composition using modified sulfur nano solution and road repairing method using the same

The present invention relates to a fast-hardening cement concrete composition containing a modified sulfur nano-aqueous solution which comprises a fast-hardening binder, fine aggregate, coarse aggregate, water, a modified sulfur nano-aqueous solution, and a performance improving admixture. The fast-hardening binder comprises early-strength Portland cement, calcium sulfoaluminate, gypsum, silicon nitride nanofibers, calcium nitrite, nepheline syenite, nylon fiber, and vitrified. The modified sulfur nano-aqueous solution is manufactured by a manufacturing method comprising a step of obtaining modified sulfur comprising dicyclopentadiene acrylate monomer represented by chemical formula 1; a step of obtaining a uniform W/O emulsion; and a step of electrolysis. The performance-improving admixture comprises styrene-isoprene-butadiene copolymer, dimethyldichlorosilane, fluoroethylene carbonate, an alkylphosphonic acid compound represented by chemical formula 2, isosorbide, octoxynol, and a cuticle layer extract of camellia leaves. The fast-hardening cement concrete composition containing the modified sulfur nano-aqueous solution of the present invention exhibits excellent self-healing performance and exhibits high durability and high strength in an early stage. In chemical formula 1, R1 is H or a linear or branched C1 to C4 alkyl group, and n is an integer from 0 to 5. In chemical formula 2, R2 is a linear or branched C1-C4 alkyl group, and x is 0 or 1.

Органоминеральный модификатор для гипсовых вяжущих и радиозащитных изделий на их основе

РОССИЙСКАЯ ФЕДЕРАЦИЯ ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) (19) RU (11) (13) 2018 117 984 A (51) МПК C04B 11/00 (2006.01) C04B 28/14 (2006.01) C04B 24/26 (2006.01) G21F 1/04 (2006.01) C04B 111/20 (2006.01) C04B 111/62 (2006.01) C04B 111/27 (2006.01) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2018117984, 15.05.2018 Приоритет(ы): (22) Дата подачи заявки: 15.05.2018 (43) Дата публикации заявки: 15.11.2019 Бюл. № 32 (57) Формула изобретения Органоминеральный модификатор для гипсовых вяжущих и радиозащитных изделий на их основе, включающий гидравлическое вяжущее, активный минеральный компонент, пластифицирующую добавку и регулятор сроков схватывания, отличающийся тем, что в качестве активного минерального компонента он содержит метакаолин, в качестве пластифицирующей добавки - поликарбоксилатный эфир «Одолит-К», в качестве регулятора сроков схватывания - водный раствор солей органических кислот «БестСПл», и дополнительно содержит гомогенную смесь олигоэтоксисилоксанов «Этилсиликат-40» и молотый шунгит при следующем содержании компонентов, мас. %: Гидравлическое вяжущее 35,7-55,6 Метакаолин 7,2-11,1 Поликарбоксилатный эфир «Одолит-К» 2,7-4,2 Водный раствор солей органических кислот «Бест-СПл» 0,6-1 Гомогенная смесь олигоэтоксисилоксанов «Этилсиликат-40» 0,2-0,3 R U Молотый шунгит 27,8-53,6, при этом степень помола шунгита составляет 200-300 м2/кг, гидравлическая активность метакаолина - не менее 1200 мг/г. Стр.: 1 A 2 0 1 8 1 1 7 9 8 4 A (54) ОРГАНОМИНЕРАЛЬНЫЙ МОДИФИКАТОР ДЛЯ ГИПСОВЫХ ВЯЖУЩИХ И РАДИОЗАЩИТНЫХ ИЗДЕЛИЙ НА ИХ ОСНОВЕ 2 0 1 8 1 1 7 9 8 4 (72) Автор(ы): Мухаметрахимов Рустем Ханифович (RU), Галаутдинов Альберт Радикович (RU), Куприянов Валерий Николаевич (RU), Шафигуллин Рамиль Ибрагимович (RU) R U Адрес для переписки: 420043, Респ. Татарстан, г. Казань, ул. Зеленая, 1, КГАСУ, ОПиИР, Хабибулину Марату Максутовичу (71) Заявитель(и): Федеральное государственное бюджетное образовательное учреждение высшего образования "Казанский государственный ...

Wax emulsion for use in building products

Provided herein are an aqueous wax emulsion, comprising water; a paraffinic hydrocarbon; polyvinyl alcohol and a wax component comprising synthetic olefin wax. Such emulsions are also useful for and disclosed herein are settable gypsum compositions and water- resistant wallboard formed therefrom. Also included herein is a montan wax substitute for use in an aqueous montan-based wax emulsion having paraffinic hydrocarbon, a wax component, water and polyvinyl alcohol wherein the wax component includes the montan wax substitute in place of use of a montan wax in the wax component such that the montan wax substitute is about 1 part to about 100 percent of the wax component and includes a synthetic olefin wax.

用于制造硬石膏的方法以及设备

本发明涉及一种用于由燃烧的Beta半水合物石膏制造硬石膏的方法，该方法包括：将石膏材料输送到后反应器(3)，该石膏材料主要由Beta半水合物石膏组成；在后反应器(3)中进行后处理以形成硬石膏，其中，Beta半水合物石膏在95℃的煅烧温度之上的温度下直接转化成Alpha半水合物石膏；从后反应器(3)中引出硬石膏；以及冷却。在将石膏材料输送到后反应器(3)时将温度调整到至少煅烧温度，在从外部输送水蒸汽的情况下以小于30分钟的停留时间在后反应器(3)中进行转化，并且如此调节在后反应器(3)中的温度以及压力，即，温度至少为95℃并且存在超压。

Composite gypsum board (versions)

FIELD: production of composite materials. SUBSTANCE: disclosed is a composite gypsum board comprising a core plate and a concentrated layer of actual thickness (e.g., at least about 0.02 inches (about 0.05 cm)). Concentrated layer contains higher weight fraction of reinforcing additive than plate core. Thickness of plate core is more than thickness of concentrated layer and forms larger part of plate volume. Concentrated layer has higher density (for example, at least approximately 1.1 times more) than that of plate core. Also disclosed is a method of making a composite gypsum board. EFFECT: disclosed is a composite gypsum board. 10 cl, 26 tbl, 6 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 721 675 C2 (51) МПК E04C 2/04 (2006.01) B32B 7/02 (2006.01) C04B 28/14 (2006.01) C04B 111/20 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК E04C 2/04 (2019.08); B32B 7/02 (2019.08); C04B 28/14 (2019.08); C04B 2111/20 (2019.08) (21)(22) Заявка: 2018102152, 22.06.2016 (24) Дата начала отсчета срока действия патента: Дата регистрации: 21.05.2020 24.06.2015 US 62/184,060; 02.02.2016 US 62/290,361; 17.06.2016 US 15/186,176; 17.06.2016 US 15/186,212; 17.06.2016 US 15/186,232; 17.06.2016 US 15/186,257 (73) Патентообладатель(и): ЮНАЙТЕД СТЕЙТС ДЖИПСУМ КОМПАНИ (US) (45) Опубликовано: 21.05.2020 Бюл. № 15 C 2 C 2 (43) Дата публикации заявки: 24.07.2019 Бюл. № 21 (56) Список документов, цитированных в отчете о поиске: US 2004038065 A1, 26.02.2004. RU 135961 U1, 27.12.2013. US 2012207989 А1, 16.08.2012. RU 2011118120 А, 10.12.2012. US 2007059513 A1, 15.03.2007. (85) Дата начала рассмотрения заявки PCT на национальной фазе: 24.01.2018 2 7 2 1 6 7 5 (86) Заявка PCT: R U 2 7 2 1 6 7 5 Приоритет(ы): (30) Конвенционный приоритет: R U 22.06.2016 (72) Автор(ы): ЛИ, Альфред С. (US), СУН, Вэйсинь Д. (US), САН, Ицзюн (US), ДИФЕНБАХЕР, Грегг Г. (US), ВИЛИНСКАЯ, Аннамария (US), КРИСТ, Брайан Дж. (US), ДЖОНС, Фредерик Т. (US), ТОДД, Брэдли В. ( ...

Способ изготовления листов на основе гипса и суспензия штукатурного гипса для применения в них

РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2018 123 358 A (51) МПК C04B 28/14 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2018123358, 14.12.2016 (71) Заявитель(и): СЕН-ГОБЕН ПЛАКО САС (FR) Приоритет(ы): (30) Конвенционный приоритет: 22.12.2015 GB 1522664.0 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 23.07.2018 R U (43) Дата публикации заявки: 23.01.2020 Бюл. № 3 (72) Автор(ы): МОРЛА Ришар (FR), ФЛЕТЧЕР Джеймс (GB), КАМЛЕР Радомир (CZ) (86) Заявка PCT: (87) Публикация заявки PCT: WO 2017/109459 (29.06.2017) R U (54) СПОСОБ ИЗГОТОВЛЕНИЯ ЛИСТОВ НА ОСНОВЕ ГИПСА И СУСПЕНЗИЯ ШТУКАТУРНОГО ГИПСА ДЛЯ ПРИМЕНЕНИЯ В НИХ (57) Формула изобретения 1. Способ непрерывного изготовления панелей на основе гипса, включающий образование смеси, содержащей штукатурный гипс, мигрирующий крахмал, стеклянные волокна и воду; отливку смеси в непрерывную полосу; выдерживание полосы в условиях, достаточных для образования из штукатурного гипса сцепленной матрицы затвердевшего гипса; нарезку полосы с образованием одной или более влажных заготовок панели; и сушку влажной заготовки панели с образованием одной или более панелей на основе гипса; где массовое соотношение между водой и штукатурным гипсом в смеси составляет менее 0,7; количество штукатурного гипса в смеси составляет более 60 мас.% относительно общего содержания твердых веществ в смеси; количество крахмала в смеси составляет более 3 мас.% относительно штукатурного гипса; количество стеклянных волокон в смеси составляет более 1 мас.% относительно штукатурного гипса; и плотность панели на основе гипса составляет более 700 кг/м3. Стр.: 1 A 2 0 1 8 1 2 3 3 5 8 A Адрес для переписки: 191002, Санкт-Петербург, а/я 5, ООО "Ляпунов и партнеры" 2 0 1 8 1 2 3 3 5 8 GB 2016/053930 (14.12.2016) Стр.: 2 A 2 0 1 8 1 2 3 3 5 8 R U A где плотность сердечника на основе гипса составляет более 700 кг/м3, и количество гипса в сердечнике на основе гипса составляет более 60 мас.%, а ...

Method for manufacturing construction materials

FIELD: construction. SUBSTANCE: manufacturing method comprises grinding borogypsum in the ball mill and its activation by drying with stirring at 210-230°C, then the borogypsum is mixed with the fiberglass filler, at the following component ratio, wt %: borogypsum 90-95, fiberglass 5-10, water 6 (above 100%), after which the billet is maintained under pressure and dried. EFFECT: increasing the manufacturability of construction materials based on gypsum-containing production waste and improving the strength characteristics of the resulting material. 2 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 617 480 C2 (51) МПК C04B 11/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ФОРМУЛА (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ 2015136342, 26.08.2015 (24) Дата начала отсчета срока действия патента: 26.08.2015 Дата регистрации: Приоритет(ы): (22) Дата подачи заявки: 26.08.2015 (43) Дата публикации заявки: 28.02.2017 Бюл. № 7 Адрес для переписки: 681013, г. Комсомольск-на-Амуре, пр. Ленина, 27, ФГБОУ ВО "КнАГТУ", отдел защиты интеллектуальной собственности, ОЗИС (56) Список документов, цитированных в отчете о поиске: RU 2324654 C1, 20.05.2008;RU 2210540 C1, 20.08.2003. SU 903334 A1, 07.02.1982. SU 1470699 A1, 07.04.1989. GB1316371 A, 09.05.1973. 2 6 1 7 4 8 0 R U (57) Формула изобретения Способ изготовления строительных материалов с использованием отходов производства, включающий сушку и смешение гипсосодержащего компонента с наполнителем, отличающийся тем, что в качестве гипсосодержащего компонента используется борогипс, который измельчается в шаровой мельнице и активируется сушкой с перемешиванием при 210-230°С, затем готовится композиция состава борогипс 90-95 мас.%; стекловолокно 5-10 мас.% (в качестве армирующего материала) и вода 6 мас.% сверх 100 мас.%, после чего заготовка выдерживается под давлением и высушивается. Стр.: 1 C 2 C 2 (54) СПОСОБ ИЗГОТОВЛЕНИЯ СТРОИТЕЛЬНЫХ МАТЕРИАЛОВ 2 6 1 7 4 8 0 (45) Опубликовано: 25.04.2017 Бюл. № ...

Ecological concrete cementing material and neutral ecological concrete

本发明公开了一种生态混凝土胶凝材料及中性生态混凝土，属于混凝土领域。生态混凝土胶凝材料，其含有以下质量份的成分：石膏20～80份，粉煤灰30～70份，高岭土5～30份，减水剂0.05～0.5份，外加剂0.05‑0.5份；所述外加剂为硫酸钙、硫酸钠、硫酸氢钠、氯化钙中的至少一种。生态混凝土，其含有上述生态混凝土胶凝材料、骨料和水。本发明生态混凝土胶凝材料呈中性，pH在6.9～7.2，28d抗压强度不小于52.3MPa；采用该胶凝材料制备中性生态混凝土，其pH在7.0～7.8，性能优异，植被生长率高达98％，能够改善建筑稳定性，同时又起到美化环境景观的作用。

High starch light weight gypsum wallboard

본 발명은 일반적으로 스터코(stucco), 나프탈렌설포네이트 분산제 및 전젤라틴화 전분(pregelatinized starch)을 포함하는 석고-함유 슬러리들을 제공한다. 상기 나프탈렌설포네이트 분산제는 건조 스터코의 중량을 기준으로 약 0.1~3.0 중량%의 양으로 존재한다. 상기 전젤라틴화 전분(pregelatinized starch)은 배합물 내에서 건조 스터코의 중량을 기준으로 최소 약 0.5중량%에서 약 10중량%의 양으로 존재한다. 또 다른 슬러리 첨가물에는 트리메타포스페이트 염(trimetaphosphate salts), 촉진제(accelerator), 결합제(binder), 종이 섬유(paper fiber), 유리 섬유(glass fiber) 및 다른 알려진 성분들이 포함된다. 본 발명은 또한 이러한 슬러리로 만들어진 석고-함유 제품들, 예를 들면 석고 월보드(gypsum wallboard), 및 석고 월보드의 제조 방법을 포함한다. 석고월보드, gypsum, wallboard

Lightweight gypsum board product and method of manufacture

Lightweight gypsum board product can be produced by modifying the calcined gypsum prior to introduction in a gypsum slurry and introducing a foaming agent by the use of a foam generator and high pressure air. The foaming agent has uniform and stable size and distribution of bubbles. The foam imparts these advantageous void properties and results in a lightweight gypsum product that has adequate strength and nail pull characteristics.

Apparatus and method for treating gypsum

[Problem] With respect to a fluidized bed type apparatus and method for treating gypsum, the purpose of the invention is to enhance or improve fluidity of gypsum powder and promote the effects of treatment of gypsum such as reforming or homogenization of the gypsum powder. [Solution] This gypsum treatment apparatus (1) includes a reactor (2), a conditioned air supply port (6), a horizontal partition wall (5) that causes conditioned air flow (Af) to flow upward into a reaction area (α), and a plurality of fixed blades (10) that are arranged at angular intervals in the peripheral direction of the reaction area. A fluidized bed (M) of calcined gypsum (Gb) is formed inside the reactor. The fixed blades deflect conditioned air flow (Ag) flown upward into the reaction area radially outward and in the peripheral direction of the reaction area. The calcined gypsum (Gb) flows by saltation or moves by saltation inside the reactor due to the conditioned air flow.

Modified reinforced gypsum material and preparation method thereof

本发明属于建筑材料的技术领域，具体涉及一种改性增强石膏材料，所述改性增强石膏材料由包括钙铝系矿物、纳米勃姆石、建筑石膏和缓凝剂的原料制备而成。本发明利用钙铝系矿物和纳米勃姆石对石膏材料进行改性，提高了其力学性能和微观的孔结构，使石膏材料的抗压强度提高20％～117％。本发明还涉及所述改性增强石膏材料的制备方法。

Concrete additive and concrete composition for reinforcing early strength

A concrete additive for improving early strength of concrete composition is provided to be used as a binder for the concrete composition and to give improved initial strength to the concrete composition while not reducing flexibility thereof by comprising inorganic material containing SO3, K, Na and Si ions in specific molar ratios as well as gypsum source. The additive includes: 25-85wt.% of gypsum source; and 15-75wt.% of inorganic material containing SO3, K, Na and Si ions in molar ratios of 5 to 20 : 1 to 10 : 5 to 20 : 2 to 10. The gypsum source comprises 30-98% of gypsum anhydrite, 1-35% of gypsum hemihydrate and 1-35% of gypsum dihydrate. The additive is used to form the early strength concrete composition in a ratio of 0.2 to 5% relative to a binder. The binder further contains 5-70% of industrial byproduct selected from fly ash and furnace slag fine powder relative to total weight of the binder, as well as cement.

Process for stabilizing a burned hemihydrate gypsum

PROCEDURE AND APPARATUS FOR STABILIZING PLASTER.

Un procedimiento para estabilizar un yeso beta-hemihidrato calcinado que comprende las etapas de: a) proveer un yeso HH calentado de preferencia a temperaturas por encima de 100 ºC; b) incorporar el yeso caliente en un dispositivo de humidificación con las paredes calentadas al menos a 100 ºC; c) inyectar agua y/o vapor en el dispositivo de humidificación en condiciones tales que las superficies aún no humedecidas del yeso se expongan al agua y/o vapor inyectado; d) mantener una atmósfera en el dispositivo de humidificación a un nivel del punto de rocío en el intervalo desde 75 hasta 99 ºC; e) incorporar la mezcla humedecida en un dispositivo de curado; f) mantener una atmósfera en el dispositivo de curado por encima de 75 ºC durante al menos 3 minutos; g) incorporar la mezcla humidificada y curada en un dispositivo de secado; y h) secar dicha mezcla humidificada y curada. A method for stabilizing a calcined beta-hemihydrate plaster comprising the steps of: a) providing a heated HH plaster preferably at temperatures above 100 ° C; b) incorporate the hot plaster in a humidification device with the walls heated to at least 100 ° C; c) injecting water and / or steam into the humidification device under conditions such that the surfaces not yet wetted from the plaster are exposed to the water and / or steam injected; d) maintain an atmosphere in the humidification device at a dew point level in the range from 75 to 99 ° C; e) incorporate the moistened mixture into a curing device; f) maintain an atmosphere in the curing device above 75 ° C for at least 3 minutes; g) incorporate the humidified and cured mixture into a drying device; and h) drying said humidified and cured mixture.

Method and apparatus for stabilizing plaster

Method and apparatus for stabilizing plaster

The invention provides a process for stabilizing plaster and an apparatus for implementing the moistening part of the process. The process comprises the following steps: a) providing a heated HH-plaster preferably at temperatures over 100 DEG C; b) feeding the hot plaster in a moistening device having walls heated to at least 100 DEG C; c) injecting water and/or steam into the moistening device in conditions that such not yet moistened surfaces of the plaster are exposed to the injected water and/or steam; d) maintaining an atmosphere in the moistening device at a level of the dew point in the range of 75 to 99 DEG C; e) feeding the moistened blend into a curing device; f) maintaining an atmosphere in the curing device above 75 DEG C for at least 3 minutes; g) feeding the moistened and cured blend into a drying device; and h) drying said moistened and cured blend. <??>The invention also provides an apparatus for moistening beta -hemihydrate plaster comprising a rotating drum with lifting blades inside where all walls in contact with the product are externally heated at a temperature above 100 DEG C. <??>The invention finally provides specific uses for plasters obtainable by the process of the invention. <IMAGE>

Method for stabilizing plaster

본 발명은 플라스터를 안정화하기 위한 방법과 이 방법의 습윤화 부분을 수행하기 위한 장치를 제공한다. 상기 방법은 a) 바람직하게는 100℃ 이상의 온도에서 가열된 HH-플라스터를 제공하는 단계; b) 적어도 100℃로 가열된 벽을 가진 습윤화 장치에서 고온의 플라스터를 공급하는 단계; c) 아직 습윤되지 않은 플라스터의 표면이 주입된 물 및/또는 증기에 노출되지 않게 하는 상태로 물 및/또는 증기를 습윤화 장치에 주입하는 단계; d) 습윤화 장치에서 75 내지 99℃ 범위내의 이슬점의 수준으로 분위기를 유지하는 단계; e)습윤된 혼합물을 경화 장치에 제공하는 단계; f) 75℃이상, 적어도 3분 동안 경화 장치에서 분위기를 유지하는 단계; g) 습윤되고 경화된 혼합물을 건조 장치에 제공하는 단계; 및 h) 상기 습윤되고 경화된 혼합물을 건조하는 단계를 포함한다. The present invention provides a method for stabilizing plaster and an apparatus for carrying out the wetting part of the method. The method comprises the steps of a) providing an HH-plaster heated preferably at a temperature of at least 100 ° C .; b) feeding hot plaster in a wetting device having walls heated to at least 100 ° C .; c) injecting water and / or vapor into the wetting device such that the surface of the plaster, which has not yet been wetted, is not exposed to the injected water and / or steam; d) maintaining the atmosphere at a level of dew point in the range of 75 to 99 ° C. in the wetting device; e) providing the wet mixture to the curing apparatus; f) maintaining the atmosphere in the curing apparatus at least 75 ° C. for at least 3 minutes; g) providing a wet and cured mixture to the drying apparatus; And h) drying the wet and cured mixture. 또한 본 발명은 생성물과 접촉하는 모든 벽들이 100℃ 이상의 온도에서 외부적으로 가열되고 내부에 상승 블레이드(lifting blade)를 가진 회전 드럼을 포함하는 β-반수화물 플라스터에 수분을 공급하는 장치를 제공한다. 마지막으로 본 발명은 본 발명의 방법에 의해 얻어지는 플라스터에 대한 특정한 용도를 제공한다. The present invention also provides an apparatus for supplying water to a β-hemihydrate plaster comprising a rotating drum with all walls in contact with the product externally heated at temperatures above 100 ° C. and having a lifting blade therein. . Finally, the present invention provides specific uses for the plaster obtained by the method of the present invention. 플라스터 Plaster

Method and apparatus for stabilizing plaster

本发明提供了一种稳定熟石膏的方法以及实施所述方法中的加湿部分的设备。所述方法包括以下步骤：a)提供加热的HH－熟石膏，优选其温度高于100℃；b)将热的熟石膏送入器壁被加热至至少100℃的加湿装置中；c)向所述加湿装置中注入水和/或蒸汽，将未加湿的熟石膏表面暴露在射入的水和/或蒸汽中；d)将加湿装置中气氛的露点水平维持在75到99℃的范围内；e)将加湿的混合物送入固化装置；f)将固化装置中气氛保持在高于75℃至少3分钟；g)将经加湿和固化的混合物送入干燥装置；和h)干燥所述经加湿和固化的混合物。本发明还提供了一种用于加湿β－半水合熟石膏的设备，其包括在内部具有掘起叶片的转鼓，其与产品接触的全部器壁被外部加热至高于100℃。本发明最后还提供了通过本发明方法获得的熟石膏的具体用途。

Method and apparatus for stabilizing plaster

The invention provides a process for stabilizing plaster and an apparatus for implementing the moistening part of the process. The process comprises the following steps: a) providing a heated HH-plaster preferably at temperatures over 100° C.; b) feeding the hot plaster in a moistening device having walls heated to at least 100° C.; c) injecting water and/or steam into the moistening device in conditions that such not yet moistened surfaces of the plaster are exposed to the injected water and/or steam; d) maintaining an atmosphere in the moistening device at a level of the dew point in the range of 75 to 99° C.; e) feeding the moistened blend into a curing device; f) maintaining an atmosphere in the curing device above 75° C. for at least 3 minutes; g) feeding the moistened and cured blend into a drying device; and h) drying said moistened and cured blend. The invention also provides an apparatus for moistening β-hemihydrate plaster comprising a rotating drum with lifting blades inside where all walls in contact with the product are externally heated at a temperature above 100° C.

Apparatus for stabilizing plaster

A process for stabilizing plaster includes: a) providing a heated HH-plaster; b) feeding the hot plaster in a moistening device having walls heated to at least 100° C.; c) injecting water and/or steam into the moistening device in conditions that such not yet moistened surfaces of the plaster are exposed to the injected water and/or steam; d) maintaining an atmosphere in the moistening device at a level of the dew point in the range of 75 to 99° C.; e) feeding the moistened blend into a curing device; f) maintaining an atmosphere in the curing device above 75° C. for at least 3 minutes; g) feeding the moistened and cured blend into a drying device; and h) drying the moistened and cured blend. Also an apparatus for moistening β-hemihydrate plaster includes a rotating drum with lifting blades inside where all walls in contact with the product are externally heated at a temperature above 100° C.

Calcium sulfate hemihydrate treatment process

A process for treating beta calcium sulfate hemihydrate is disclosed. The process comprises exposing beta calcium sulfate hemihydrate to steam at a pressure above atmospheric pressure.

Method and device for stabilizing, cooling and dehumidifying stucco

In einem Verfahren zur kontinuierlichen Konditionierung von Stuckgips wird dieser in Form von Partikeln aus einer vorgeschalteten Kalzinieranlage einem Stuckgipskühler zugeführt wird. In dem Stuckgipskühler werden zunächst lösliches Calciumsulfat-Anhydrit zu Calciumsulfat-Halbhydrat und Calciumsulfat-Dihydrat zu Calciumsulfat-Halbhydrat umgewandelt und Kristalldefekte geheilt. Anschließend wird der Stuckgips mit Umgebungsluft in Kontakt gebracht und durch diese entfeuchtet und hierbei gleichzeitig indirekt gekühlt. In a method for the continuous conditioning of plaster of paris, this is fed in the form of particles from an upstream calcining plant to a plaster of paris cooler. In the stucco cooler, soluble calcium sulfate anhydrite is first converted into calcium sulfate hemihydrate and calcium sulfate dihydrate into calcium sulfate hemihydrate and crystal defects are healed. The plaster of paris is then brought into contact with ambient air and dehumidified by it and indirectly cooled at the same time.

Method for stabilizing beta-hemihydrate plaster

The instant invention is concerned with the post-treatment of β-hemihydrate plasters for the purpose of stabilization. The invention relies in the addition of a retardant to the calcined β-hemihydrate. It is also the purpose of the invention to provide stabilized β-hemihydrate plasters which exhibit advantageous properties.

Process and device for stabilising, cooling and dehumidifying gypsum plaster

In a process for the continuous conditioning of gypsum plaster, the gypsum plaster is passed from a calcination facility connected upstream to a gypsum plaster cooler in the form of particles. In the gypsum plaster cooler, soluble calcium sulphate anhydrite is initially converted to calcium sulphate hemi-hydrate and calcium sulphate dihydrate to calcium sulphate hemi-hydrate, and crystal defects are eliminated. Subsequently, the gypsum plaster is brought into contact with ambient air and dehumidified by the latter and thereby simultaneously cooled indirectly.

Method of curing a gypsum calcination product

A method of conditioning stucco comprises the steps of supplying a quantity of stucco particles to a reaction vessel, the stucco particles comprising calcium sulphate hemihydrate and/or calcium sulphate anhydrite, as well as calcium sulphate dihydrate; and conditioning the stucco particles at a temperature of at least 100°C and a humidity of at least 70%. During the step of conditioning the stucco particles, the bulk density of the stucco particles within the reaction vessel is at least 1 g/cm 3 .