LOWER HEAT PROCESSED CALCIUM SULPHATES FOR EARLY STRENGTH CEMENTS AND GENERAL USE

The Invention is related to increasing of early strength and final strengths of cements classified under EN and ASTM as Portland or CEM cements and also related to all clinker employing cements and to any kinds which employ calcium sulphates for set optimization and is for composing of new cements by only assessing new methods for production and is for composing of new cements by only assessing new methods to formation and inclusion of calcium sulphate resources which are used for set optimization. A new calcium sulphate resource is obtained by employing lower heats and this input is arranged to different dehydration levels at which they can be most efficient for the selected use. These different dehydration levels are called intermediate phases of dehydrate or hemihydrates or called as monohydrate. 1. As the prevailing method of inclusion of gypsum stones to the clinker at its grinding phase while it is cooling also , gypsum enters into a complex dehydration sequence where a preassumed ratio of it converts to hemihydrates and soluble anhydrites , it is cements that shall yield higher early and final strengths by inclusion of calcium sulphate resources which have a specific dehydration level and method and it consists of a new method of calcium sulphate inclusion to other cement components by inclusion of gypsum stones whom are dehydrated at planned rates by employing a specific heat level in range of 90-145° c. and inclusion at an optimum rate to clinker and other components as the sole or main calcium sulphate resource.2. As per claim 1 , it is dehydration of gypsum stones at lower heats compared to known gypsum calcinations (Dehydration) at 90° c.-120° c. and more efficiently at 105° c.-120° c. and to 135° c.-145° c. for more rapid processes and use these products which gain different characteristics than the known calcium sulphate resources as the main calcium sulphate resource in cements production.3. For obtaining the gypsums as per and claim 1 , instead of ...

METHOD FOR DRYING SLAB-SHAPED MATERIALS AND DRYING DEVICE

A method for drying building material slabs, in particular slabs containing gypsum, which are guided in floors () through an device divided into a drying pre-zone () and drying chambers and in which the slabs are brought into contact with drying air, characterized in that drying air is applied from the drying pre-zone () to the slabs in an area () arranged upstream of the pre-zone () and enclosed at least, with respect to the conveying direction of the boards, on both longitudinal sides and on the upper side. 115.-. (canceled)16. A method for drying building material slabs , wherein the method comprises guiding the slabs in floors through a device divided into a preliminary drying zone and drying chambers and in which the slabs are brought into contact with drying air , the drying air being applied from the preliminary drying zone to the slabs in an enclosed area which is arranged upstream of the preliminary drying zone and is enclosed , with respect to a conveying direction of the slabs , at least on both longitudinal sides and on an upper side thereof.17. The method of claim 16 , wherein the slabs comprise gypsum.18. The method of claim 16 , wherein exhaust air from the preliminary drying zone flows as drying air along the slabs in the enclosed area counter to a conveying direction of the slabs.19. The method of claim 16 , wherein the drying air from the enclosed area is fed to a chimney via a pipe.20. The method of claim 19 , wherein the drying air is withdrawn from the enclosed area by a fan inserted in the pipe.21. The method of claim 16 , wherein a supply of drying air into the enclosed area is controlled or regulated by temperature and/or humidity sensors.22. The method of claim 16 , wherein a slight negative pressure of 50 Pa or less claim 16 , is generated in the enclosed area.23. The method of claim 22 , wherein the negative pressure is 25 Pa or less.24. The method of claim 16 , wherein a moisture content of air in the enclosed area is controlled to a ...

MICROWAVE HEATING FOR GYPSUM MANUFACTURING PROCESSES

Methods of making calcium sulfate whiskers are provided. In one aspect, a method includes autoclaving a slurry of calcium sulfate hemihydrate and water to form calcium sulfate hemihydrate whiskers in water and microwaving the whiskers to dewater them, wherein the microwaving is effective to prevent a majority of the whiskers from reverting to a dihydrate form. In one aspect, a method includes microwaving calcium sulfate hemihydrate whiskers to form anhydrite calcium sulfate whiskers, wherein the microwaving is effective to remove a substantial amount of chemically bound water from the whiskers. 1. A method of making calcium sulfate whiskers , comprising:autoclaving a slurry of calcium sulfate hemihydrate and water to form calcium sulfate hemihydrate whiskers in water; andmicrowaving the calcium sulfate hemihydrate whiskers to dewater the calcium sulfate hemihydrate whiskers,wherein the microwaving is effective to prevent a majority of the calcium sulfate hemihydrate whiskers from reverting to a dihydrate form.2. The method of claim 1 , wherein the microwaving is effective to remove a substantial amount of physically free water from the calcium sulfate hemihydrate whiskers.3. The method of claim 1 , wherein the microwaving effective to reduce a moisture content of the calcium sulfate hemihydrate whiskers to 20% or less claim 1 , by weight.4. The method of claim 1 , wherein the microwaving is effective to reduce a moisture content of the calcium sulfate hemihydrate whiskers by at least 40% claim 1 , by weight.5. The method of claim 1 , wherein the microwaving is performed at a power level of at least 1000 watts.6. The method of claim 1 , wherein the microwaving maintains the calcium sulfate hemihydrate whiskers at a temperature of 100° C. or above claim 1 , such that the calcium sulfate hemihydrate whiskers cannot revert into a dihydrate form.7. The method of claim 1 , wherein the calcium sulfate hemihydrate comprises alpha calcium sulfate hemihydrate or beta calcium ...

A NEW METHOD FOR PRODUCING CALCIUM SULPHATE HEMIHYDRATE WITH UNIQUE PROPERTIES

The present invention relates to a new method for producing a calcium sulphate hemihydrate with unique properties for use for therapeutic applications in the cosmetic or pharmaceutical industry. Calcium sulphate hemihydrate is a biocompatible and biodegradable inorganic substance and thus suitable as a carrier in pharmaceutical compositions, e.g. a controlled release composition, containing at least one pharmaceutically active ingredient. 1. A method for producing calcium sulphate hemihydrate powder comprising the steps ofa. treating calcium sulphate dihydrate in a closed cabinet with controlled temperature, air circulation in the cabinet and an adjustable air outflow from the cabinet;b. adjusting the temperature to from above 100 to 220° C.;c. allowing for a process time of 1-12 hours; andd. adjusting the moist air outflow from the cabinet to 0.2-1.5 L/s.2. The method according to claim 1 , wherein the temperature in step b is 150-220° C.3. The method according to claim 1 , wherein the temperature in step b is 180-210° C.4. The method according to claim 1 , wherein the temperature in step b is 185-205° C.5. The method according to claim 1 , wherein the temperature in step b is 190-203° C.6. The method according to claim 1 , wherein the temperature in step b is 200° C.7. The method according to claim 1 , wherein the time in step c is 2-8 hours.8. The method according to claim 1 , wherein the time in step c is 3-5 hours.9. The method according to claim 1 , wherein the time in step c is 3.5-4.5 hours.1011-. (canceled)12. The method according to claim 1 , wherein the outlet in step d is 0.25-1 L/s.13. The method according to claim 1 , wherein the outlet in step d is 0.25-0.8 L/s.14. The method according to claim 1 , wherein the outlet in step d is 0.3-0.7 L/s.15. The method according to claim 1 , wherein the outlet in step d is 0.4-0.6 L/s.1617-. (canceled) The present invention relates to a new method for producing a calcium sulphate hemihydrate for use in the ...

Recycling method of dihydrate gypsum from waste gypsum boards

Gypsum derived from waste gypsum boards is calcined and converted into gypsum granules including hemihydrate and/or anhydrous type III gypsum. The calcined gypsum granules are dropped into water to prepare a gypsum slurry. Then, dihydrate gypsum particles are crystalized in the slurry. The temperature of the gypsum granules just before being dropped into the water is 90° C. or higher.

BIOACTIVE MATERIAL

A process and apparatus for manufacture of biocide products are described. The biocide properties arise from the caustic calcined powder, from carbonates such as such as magnesite and dolomite, and from hydroxides such as brucite. The method of manufacture is based on the production of high surface area oxide particles using an indirectly heated counterflow reactors for specifically calcining the carbonates and the hydroxides without significant sintering. The biocide products may be a powder or a hydrated slurry. A hydrated slurry is preferred for agricultural applications as a spray. For aquaculture applications, the products have a preferred particle size distribution to impact the aquatic and benthic ecosystems, and a Ca/Mg ratio that promotes the growth of the cultivates species when applied as a powder or a slurry. For applications such as a marine paint, the powder product or the slurry product is mixed with various agents to form a setting coating, and is applied to the infrastructure that is otherwise subject to biofilm growth. 1. A process for producing a biocide powder , comprising the steps of:a. selecting one or more carbonate compounds with a predetermined calcium/magnesium ratio;b. grinding the carbonate compounds to produce a carbonate powder with a first predetermined particle size distribution;c. selecting a magnesium hydroxide compound;d. grinding the hydroxide compound to produce a hydroxide powder with a second sufficient particle size distribution;{'sup': '2', 'e. calcining the carbonate powder in an externally heated counterflow flash calciner at a first temperature to produce a calcined mixture having a surface area of at least 200 m/gm;'}{'sup': '2', 'f. calcining the hydroxide powder in an externally heated counterflow flash calciner at a second temperature to produce a calcined oxide with a surface area of more than 120 m/gm; and'}g. blending the calcined mixture and the calcined oxide in a predetermined proportions to obtain a biocide ...

PROCESS FOR PREPARING CHEMICALLY MODIFIED BICARBONATE SALT PARTICLES

The present disclosure relates to a method for chemically modifying particles of a bicarbonate salt in a co-rotating twin-screw extruder and chemically modified bicarbonate particles prepared therefrom. The present disclosure also relates to a method for controlling an amount of carbonate salt formed during chemical modification of bicarbonate salt particles. 1. A chemically modified bicarbonate salt particle compound comprising:{'sub': 'w', 'a bicarbonate salt and a carbonate salt, wherein a 5% aqueous solution of the chemically modified bicarbonate salt particles has pH in the range of 9.25 to 9.6, and water activity (a) in the range of 0.05 to 0.3.'}2. The chemically modified bicarbonate salt particle compound of claim 1 , wherein the pH of 5% aqueous solution of the particles has standard deviation of not more than 0.1 claim 1 , wherein the standard deviation is calculated by measuring the pH of at least 10 equal aliquots of the chemically modified bicarbonate salt particles.3. The chemically modified bicarbonate salt particle compound of claim 1 , wherein the bicarbonate salt is selected from the group consisting of sodium bicarbonate claim 1 , potassium bicarbonate claim 1 , calcium bicarbonate and combinations thereof.4. The chemically modified bicarbonate salt particle compound of claim 1 , wherein the particle comprise about 3% to 40% (w/w) of the carbonate salt.5. The chemically modified bicarbonate salt particle compound of claim 1 , wherein the compound comprises about 11% to 14% (w/w) of the carbonate salt.6. The chemically modified bicarbonate salt particle compound of claim 1 , wherein the compound comprises about 15% to 19% (w/w) of the carbonate salt.7. The chemically modified bicarbonate salt particle compound of claim 1 , wherein the compound comprises about 26% to 29% (w/w) of the carbonate salt.8. The chemically modified bicarbonate salt particle compound of claim 1 , wherein the compound comprises about 35% to 39% (w/w) of the carbonate salt.9. ...

TWO-STAGE CALCINATION METHOD, AND PLANT FOR SAME

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 and the hot plaster is post-calcinated in a reaction vessel. Post-calcination is carried out in the reaction vessel by adding humid gas, said reaction vessel not being heated. The postcalcination 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. Calcination takes 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. The method can ensure consistency in the product quality and also increase product quality. The temperature in the upstream calcinator can be lowered thus saving more energy. The method can also be used to accelerate the ageing of calcinated plaster. 1. A method for calcining gypsum , comprising:calcining the gypsum in a first stage with flash calcination,guiding the gypsum from the first stage to a second stage via a transfer line, andcalcining the gypsum to completion in a reaction vessel in a second stage using indirect heating, wherein, in the second stage, water vapor is recirculated without external vapor or water being supplied.2. The method of claim 1 , comprising setting an excessively high content of water of crystallization in the transfer line that is greater than a target content of water of crystallization of the second stage.3. The method of claim 1 , wherein recirculation of water vapor comprises variable recirculation with differing degrees of recirculation.4. The method of claim 1 , wherein recirculated water vapor is returned via a fluidization device into the reaction vessel for the second stage.5. The method of claim 1 , wherein the second stage comprises a regulable blower for recirculation of the water vapor.6. The method of claim 1 , wherein ...

Method for preparing a-calcium sulfate hemihydrate with calcium sulfate dihydrate

A method for preparing α-calcium sulfate hemihydrate with calcium sulfate dihydrate includes steps of: uniformly mixing the calcium sulfate dihydrate with an additive solution, and obtaining a mixture, wherein weight percentages of the calcium sulfate dihydrate and the additive solution in the mixture are respectively 90.00-95.00% and 5.00-10.00%, and the additive solution contains water, inorganic salt, organic salt, organic acid, surfactant, and seed crystal; rising a temperature of the mixture to 130-150° C., keeping for 20-120 minutes, and the calcium sulfate dihydrate in the mixture transforming to the α-calcium sulfate hemihydrate; drying the mixture after reaction at 105-160° C., and thereafter obtaining α-calcium sulfate hemihydrate product. The used calcium sulfate dihydrate can be natural raw materials and industrial by-products. The industrial by-products can be directly applied. Through utilizing characteristics of the industrial by-products, a dehydration reaction time and a drying time are shortened, and a product quality is obviously increased. 1. A method for preparing α-calcium sulfate hemihydrate with calcium sulfate dihydrate , comprising steps of: (1) uniformly mixing the calcium sulfate dihydrate with an additive solution , and obtaining a first mixture , wherein weight percentages of the calcium sulfate dihydrate and the additive solution in the first mixture are respectively 90.00-95.00% and 5.00-10.00%; (2) rising a temperature of the first mixture to 120-160° C. , keeping the temperature for 15-130 minutes , and obtaining a second mixture; and (3) drying the second mixture at 100-170° C. , and thereafter obtaining α-calcium sulfate hemihydrate product.2. The method for preparing the α-calcium sulfate hemihydrate with the calcium sulfate dihydrate claim 1 , as recited in claim 1 , wherein the additive solution contains water claim 1 , inorganic salt claim 1 , organic salt claim 1 , organic acid claim 1 , surfactant claim 1 , and seed crystal. ...

PROCESSING QUARANTINED MATERIALS

A method and an apparatus for destroying biosecurity hazards in quarantined feed materials and producing valuable products that are safe and have economic value is disclosed. The apparatus includes a continuous converter () that has a reaction chamber () for producing a solid carbon-containing product, a gas product, and optionally an oil product and a separate water-based condensate product in the chamber, via pyrolysis or other reaction mechanisms. 1. An apparatus for destroying biosecurity hazards in quarantined feed materials and producing valuable products that are safe and have economic value , the apparatus including a continuous converter for a feed material including quarantined materials and additional biomass , with the continuous converter including a reaction chamber for producing a solid carbon-containing product , a gas product , and optionally an oil product and a separate water-based condensate product in the chamber , via pyrolysis or other reaction mechanisms , an inlet for supplying the feed material to the reaction chamber , an assembly for moving the feed material through the reaction chamber from the upstream end towards the downstream end of the chamber counter-current to the flow of gas generated in the chamber as a consequence of drying or other reactions in the chamber , and separate outlets for the solid carbon-containing product , the gas product , and optionally the oil product and the water-based condensate product from the reaction chamber.2. The apparatus defined in wherein the continuous converter includes an assembly for establishing a temperature profile in the reaction chamber that includes the following zones extending successively along the length of the reaction chamber from the upstream end to the downstream end of the reaction chamber:(a) a drying zone (Zone 1) for drying the feed material—typically 60-80° C. is the inlet end temperature and 100-150° C. is the upper temperature limit of Zone 1,(b) a pre-heating zone (Zone 2) ...

METHOD OF PRODUCING GYPSUM BINDER

A method of producing a gypsum binder, the method including dehydrating of gypsum raw material lumps by heating in a gaseous medium with further drying, cooling, and milling stages, wherein the heating gypsum raw material lumps is performed either by: (i) placing the lumps in a heating medium set to a temperature exceeding the temperature under which dehydration and formation of gypsum α-hemihydrate occurs; and/or (ii) placing the lumps in a heating medium having a high rate of temperature increase such that a temperature higher than the temperature under which dehydration and formation of gypsum α-hemihydrate occurs is reached; wherein a heating time is selected sufficient for completion of the process of gypsum α-modification formation within the gypsum lumps, and wherein the heating is performed under atmospheric pressure through lump surface. 1. A method of producing a gypsum binder , the method comprising:dehydrating of gypsum raw material lumps by heating in a gaseous medium with further drying, cooling, and milling stages,wherein the heating gypsum raw material lumps is performed either by:(i) placing the lumps in a heating medium set to a temperature exceeding the temperature under which dehydration and formation of gypsum α-hemihydrate occurs; or(ii) placing the lumps in a heating medium having a high rate of temperature increase such that a temperature higher than the temperature under which dehydration and formation of gypsum α-hemihydrate occurs is reached;wherein a heating time is selected sufficient for completion of gypsum α-modification formation within the gypsum lumps, andwherein the heating is performed under atmospheric pressure through lump surface.2. The method of claim 1 , wherein natural gypsum stone and/or synthetic gypsum claim 1 , and/or recycled gypsum are used as gypsum raw materials.3. The method of claim 2 , wherein the lumps of gypsum raw material are formed by crushing and/or agglomerating.4. The method of claim 1 , wherein the ...

Method of Forming a Gypsum Based Product

A method of forming a gypsum based product is disclosed. The method comprises the steps of: calcining a mixture of water and gypsum under conditions of raised temperature and pressure within a vessel to produce an alpha-hemihydrate slurry therein; passing the alpha-hemihydrate slurry from the vessel to a mixer for mixing with additional water to produce a settable slurry, which is arranged to set to form the gypsum based product. 1. A method of forming a gypsum based product , the method comprising the steps of:calcining a mixture of water and gypsum under conditions of raised temperature and pressure within a vessel to produce an alpha-hemihydrate slurry therein;passing the alpha-hemihydrate slurry from the vessel to a mixer for mixing with additional water to produce a settable slurry, which is arranged to set to form the gypsum based product.2. A method according to further comprising the step of reducing the water content of the alpha-hemihydrate slurry to provide a separate water stream from the alpha-hemihydrate slurry.3. A method according to claim 1 , wherein the calcination step comprises substantially filling the vessel with water and gypsum so that the vessel is substantially devoid of free space claim 1 , such that the water produced during the calcination of gypsum is prevented from evaporating.4. A method according to claim 1 , wherein the raised temperature comprises a temperature within the range 110° C. to 170° C.5. A method according to claim 1 , wherein the raised pressure comprises a pressure within the range 2 to 8 Bars.6. A method according to claim 1 , further comprising the step of cooling the alpha-hemihydrate slurry after the step of calcining the mixture of water and gypsum.7. A method according to claim 6 , wherein the alpha-hemihydrate slurry is cooled to a temperature less than 100° C.8. A method according to claim 6 , comprising the further step claim 6 , after the step of cooling the alpha-hemihydrate slurry claim 6 , of de- ...

PROCESS AND APPARATUS FOR MANUFACTURE OF CALCINED COMPOUNDS FOR THE PRODUCTION OF CALCINED PRODUCTS

A process for producing a highly calcined and uniformly calcined product from a feedstock. The process comprising the steps of grinding the feedstock to powder, preheating the powder, and calcining the powder in a reactor plant that comprises a number of reactor segments in which a flash calciner is used in each progressive reactor segment to incrementally react the powder by raising the temperature in each segment. The last segment may be a high-temperature reactor that has a controlled residence time and temperature that may allow controlled finishing of the calcination process to achieve a desired degree of calcination and sintering of the product; and cooling of the product. 1. A process for producing a calcined product from a feedstock , the process comprising:grinding the feedstock to a powder;preheating the powder;calcining the powder in a reactor plant that comprises a plurality of reactor segments each comprising a flash calciner to incrementally react the powder in a calcination process by raising the temperature in each segment;wherein a final segment is a high-temperature reactor having a controlled residence time and temperature to allow controlled finishing of the calcination process to achieve a selected degree of calcination and sintering of the product; andcooling the product.2. The process of claim 1 , wherein the final reactor segment comprises a circulating fluidized bed reactor.3. The process of claim 2 , wherein the circulating fluidized bed reactor is directly heated by a heating gas claim 2 , and an exhaust gas of the circulating fluidized bed is separately treated from exhaust gases of reactors in the earlier reactor segments.4. The process of claim 1 , wherein the plurality of reactor segments comprises at least one intermediate reactor segment externally heated using a gas stream derived from a combustion process.5. The process of claim 1 , wherein the reactor segments are electrically powered.6. The process of claim 1 , wherein the ...

METHOD FOR PRODUCING CALCIUM SULFATE

A method for preparing calcium sulphate comprising a production of DCP by the attack of a source of phosphate by an acid, a digestion of the isolated DCP by the sulphuric acid under conditions giving rise to the formation of a first slurry of gypsum suspended in an acidic aqueous phase having a content of free SOequal to or less than 1.5% and a content of free PO, a conversion of at least part of said first slurry by heating to a temperature greater than 80° C. and potentially by adding sulphuric acid, with solubilisation of the gypsum crystals and recrystallisation of the solubilised calcium sulphate in a second slurry of α-calcium sulphate hemihydrate crystals suspended in an aqueous phase based-on phosphoric acid, wherein the content of free SOis less than 10% by weight, and a separation between said aqueous phase and a filter cake based on particularly pure α-calcium sulphate hemihydrate. 1. A method for preparing calcium sulphate comprising the steps of: attack in an aqueous medium of a source of phosphate by an acid with the formation of a pulp comprising an aqueous phase containing water-soluble calcium phosphate and a solid phase containing impurities,', 'separation of the aqueous phase,', 'neutralisation neutralization of the latter by a neutralizing calcium compound with precipitation of said calcium monohydrogen phosphate in an aqueous solution, and', 'isolation of the precipitated calcium monohydrogen phosphate from said aqueous solution, and, 'producing calcium monohydrogen phosphate by{'sub': 2', '5, 'digesting the isolated calcium monohydrogen phosphate in an aqueous medium by sulphuric acid under conditions giving rise to the formation of a first slurry of calcium sulphate dihydrate crystals suspended in an acidic aqueous phase having a content of free PO,'}{'sub': '3', 'wherein digestion is carried out in order to obtain, in the first slurry, a content of free SOequal to or less than 1.5% by weight of the first slurry, and'} {'sub': '3', 'converting ...

ACCELERATOR COMPRISING STARCH, AND RELATED BOARD, SLURRIES, AND METHODS

An accelerator for accelerating the rate of hydration of calcined gypsum is disclosed. The accelerator comprises calcium sulfate dihydrate particles and a starch. The starch has a cold water solubility of at least about 25% (e.g., at least about 35%) and a viscosity of about 25 Brabender Units (BU) or less when the starch is in a 30% aqueous slurry at 92° C. Also disclosed are a method of preparing an accelerator, method of hydrating stucco to form set gypsum, slurry, and method of making gypsum board. 1. An accelerator comprising particles of calcium sulfate dihydrate , and starch having a cold water solubility of at least about 25% and a viscosity of about 25 Brabender Units (BU) or less when the starch is in a 30% aqueous slurry at 92° C.2. The accelerator of claim 1 , wherein the particles of calcium sulfate dihydrate have an average particle size of from about 20 μm to about 50 μm.3. The accelerator of claim 1 , wherein the starch has a cold water solubility of at least about 35%.4. The accelerator of claim 3 , wherein the accelerator is prepared by co-grinding the calcium sulfate dihydrate in the presence of the starch.5. The accelerator of claim 4 , wherein the starch has an average particle size of from about 20 μm to about 100 μm prior to co-grinding.6. The accelerator of claim 4 , wherein the starch is present in an amount from about 1% to about 10% by weight of the accelerator.7. The accelerator of claim 4 , wherein the co-grinding occurs in a ball mill.8. The accelerator of claim 4 , wherein the co-grinding occurs for a period of from about 10 minutes to about 90 minutes.9. A method of preparing gypsum board comprising:(a) providing a first cover sheet;(b) mixing a slurry comprising stucco, water, and an accelerator comprising calcium sulfate dihydrate particles and starch having a cold water solubility of at least about 25% (e.g., at least about 35%), and a viscosity of about 25 Brabender Units (BU) or less when the starch is in a 30% aqueous starch ...

Air and Water Barrier Building Panels

A method for improving the air and/or water barrier performance of a building panel is disclosed. The building panel may be a gypsum board or cement board. In particular, the board may have improved resistance to bulk water penetration or permeation while maintaining breathability with respect to water vapor. 1. A method for improving the air and water barrier performance of a building panel , the method comprising:providing a first facing material,providing a board slurry on the first facing material,providing a second facing material on the board slurry, andproviding a hydrophobic material to the first facing material, the second facing material, or both.2. The method of claim 1 , wherein the hydrophobic material is applied to the second facing material after being placed on the board slurry wherein the hydrophobic material is applied on a side of the second facing material opposite a side adjacent the board slurry.3. The method of claim 1 , wherein the hydrophobic material is applied to the first facing material prior to providing the first facing material wherein the hydrophobic material is applied on a side of the first facing material opposite a side adjacent the board slurry.4. The method of claim 1 , wherein the hydrophobic material is provided in the board slurry which then migrates to the first facing material claim 1 , the second facing material claim 1 , or both.5. The method of claim 1 , wherein the hydrophobic material includes a polysiloxane.6. The method of claim 1 , wherein the hydrophobic material comprises a polymer coating.7. The method of claim 6 , wherein the polymer includes polytetrafluoroethylene or a polyolefin.8. The method of claim 1 , wherein the first facing material claim 1 , the second facing material claim 1 , or both have hydrophobic properties and further wherein a hydrophilic facing material is positioned between the first facing material claim 1 , the second facing material claim 1 , or both and the board slurry.9. A method for ...

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 ...

Method of producing phosphoric acid and calcium sulfate dihydrate

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.

一种转晶剂以及使用其制备α型高强石膏的用途

提供一种转晶剂，其为具有式(I)结构的化合物、具有式(I)结构的化合物的盐和具有式(II)结构的化合物中的任意1种或至少2种的组合，其中，R 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 和R 8 均各自独立地选自有机基团；R’为甲基；n为0或1。该转晶剂在水中具有像钳子一样的两个羧酸基团，其能够在α‑CaSO 4 ·0.5H 2 O晶体的(114)面上产生强烈的吸附作用。由该转晶剂制备的α型高强石膏的晶体长径比在1:0.5～1:3范围内，其具有5.0MPa以上的2小时抗折强度，43MPa以上的烘干抗压强度。

A method of forming a gypsum based product

본 발명은 석고계 제품을 형성하는 방법에 관한 것이다. 상기 방법은 용기 내에서 상승된 온도 및 압력 조건하에 물과 석고의 혼합물을 하소시켜 그 안에 알파-반수화물 슬러리를 생성시키는 단계; 및 알파-반수화물 슬러리를 용기로부터 혼합기로 통과시켜 추가의 물과 혼합시킴으로써 경화성 슬러리를 생성시키고, 이를 정렬하여 경화시킴으로써 석고계 제품을 형성하는 단계를 포함한다. The present invention relates to a method for forming gypsum-based products. The method includes calcining a mixture of water and gypsum under elevated temperature and pressure conditions in a vessel to produce an alpha-hemihydrate slurry therein; And passing the alpha-hemihydrate slurry from the vessel through a mixer to mix with additional water to produce a curable slurry, which is then aligned and cured to form a gypsum-based product.

二型無水石膏の製造方法及びセメント

(57)【要約】 【課題】 石膏ボード廃材から回収した石膏をセメント 用に有効利用することができ、モルタル・コンクリート 混練時において起泡作用が無く、排煙脱硫石膏を使用し たセメントと同等の強さを有する二型無水石膏の製造方 法及びセメントを提供する。 【解決手段】 石膏ボード廃材より回収した石膏に硫酸 を添加して加温することを特徴とする。

高强石膏装饰水泥及其制作方法

本发明公开了一种高强石膏装饰水泥及其制作 方法，它是选用天然纤维石膏制成的高强石膏(α半 水石膏和无水石膏)，白色硅酸盐水泥熟料，外加剂混 合而成。其重量比为高强石膏50—90％，白色硅酸 盐水泥熟料1—50％，外加剂乙二酸和/或含水硫酸 铝0.1—2.5％。本发明产品既保持了石膏材料的高 装饰性、微膨胀性，抗折强度高及早强的优点，又体现 了白色硅酸盐水泥的耐水、抗冻、抗干湿循环、耐候、 硬度高及凝结时间适宜等优点，其应用非常广泛。

Modifying additive

FIELD: chemistry. SUBSTANCE: invention relates to construction materials, particularly additives to cement, concrete mixture, mortar, used for making concrete and reinforced concrete objects, as well as gypsum based objects. The modifying additive, a product of processing wastes from sulphuric acid mineral raw material from the Dalnegorsk deposit datolite - wollastonite skarn with storage period of over one month has the following composition, wt %: gypsum dihydrate 61 to 76, amorphous silica 16 to 22, non-decomposed mineral 4 to 12, boric acid 1 to 2, preferably after heating to 100 to 120°C before conversion of dihydrate gypsum to hemihydrate gypsum. EFFECT: increased strength of construction materials and objects. 5 ex, 1 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 371 400 (13) C2 (51) МПК C04B 7/00 (2006.01) C04B 28/00 (2006.01) C04B 111/20 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21), (22) Заявка: 2007132636/03, 29.08.2007 (24) Дата начала отсчета срока действия патента: 29.08.2007 (43) Дата публикации заявки: 10.03.2009 Адрес для переписки: 690001, Приморский край, г. Владивосток, ул. Пушкинская, 37, ДВГТУ, Патентный отдел, М.И. Звонареву C 2 C 2 (73) Патентообладатель(и): Общество с ограниченной ответственностью "ПОЛИСТРОЙМАТЕРИАЛЫ" (ООО "ПСМ") (RU) R U 2 3 7 1 4 0 0 (54) МОДИФИЦИРУЮЩАЯ ДОБАВКА (57) Реферат: Изобретение относится к строительным материалам, в частности к добавкам к цементу, бетонной смеси, строительным растворам, используемым для изготовления бетонных и железобетонных изделий, а также изделий на основе гипса. Технический результат повышение прочности строительных материалов и изделий. Модифицирующая добавка - продукт переработки хвостов сернокислотной переработки минерального сырья Дальнегорского месторождения датолит-волластонитовых скарнов со сроком хранения более одного месяца имеет следующий состав, мас.%: двуводный гипс 6176, аморфный кремнезем 16-22, ...

Crack retardant mixture using lime type Expansive admixture

The present invention relates to a crack prevention and shrinkage reduction composition using a lime-based expansion agent. According to an embodiment of the present invention, the crack prevention and shrinkage reduction composition using a lime-based expansion agent comprises: the lime-based expansion agent including 10-60 parts by weight of anhydrite or gypsum dehydrate for 100 parts by weight of limestone. 100 parts by weight of the lime-based expansion agent includes: 1-5 parts by weight of silicon oxide, and 1-5 parts by weight of silicon carbide. The present invention improves a crack control effect and a shrinkage control effect.

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.

PROCESS AND PLANT FOR THE PRODUCTION OF CALCIUM SULFATE HEMI-HYDRATE ALPHA UNDER ORDINARY PRESSURE

It is a kind of to prepare the method for enhancing land plaster, enhancing land plaster and brushing gypsum

本发明公开一种制备增强石膏粉的方法，按以下步骤制备：步骤一、改性：将煅烧石膏破碎改性，得到改性石膏；步骤二、提纯：去除改性石膏粉中大颗粒杂质，得到增强石膏粉。本发明还公开一种粉刷石膏，包括增强石膏粉，以及复合添加剂。采用本发明的有益效果是，开辟了由磷石膏为原料生产高性能石膏粉的工艺方法，有利于磷石膏的高效资源化利用；通过改性增强制得的新型增强石膏粉产品抗折强度高、凝结时间稳定、水标稠稳定，整体性能优于常见建筑石膏，应用范围大于建筑石膏，突破了普通建筑石膏不能用于室内粉刷的限制；制得的粉刷石膏，其单位重量干粉能够粉刷的抹灰面积大于同等重量的建筑石膏以及水泥砂浆，材料成本较低，适于室内粉刷使用。

Method of baking at low content of fiber for making plaster-fiber sheet

FIELD: process engineering. SUBSTANCE: invention relates to construction, namely, to method of fabricating plaster-fiber sheets. Method of making said sheets with cellulose fibers comprises adding first portion of cellulose fibers to gypsum before baking gypsum and fibers in reactor, adding second portion of said fibers to suspension after it gets out from reactor, arranging said suspension into a carpet, and finishing said carpet to produced finished plaster-fiber sheet. EFFECT: higher strength of sheets. 19 cl, 2 ex, 2 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 478 470 (13) C2 (51) МПК B28B 1/52 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ Приоритет(ы): (30) Конвенционный приоритет: 20.12.2007 US 11/962,031 (73) Патентообладатель(и): ЮНАЙТЕД СТЭЙТС ДЖИПСУМ КОМПАНИ (US) (43) Дата публикации заявки: 27.01.2012 Бюл. № 3 2 4 7 8 4 7 0 (45) Опубликовано: 10.04.2013 Бюл. № 10 (56) Список документов, цитированных в отчете о поиске: US 7273579 B2, 25.09.2007. US 4252568 A1, 24.02.1981. US 4544424 A1, 01.10.1985. US 4392896 A1, 12.07.1983. RU 2095328 C1, 10.11.1997. 2 4 7 8 4 7 0 R U (86) Заявка PCT: US 2008/087458 (18.12.2008) C 2 C 2 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 20.07.2010 (87) Публикация заявки РСТ: WO 2010/039160 (08.04.2010) Адрес для переписки: 105215, Москва, а/я 26, Н.А. Рыбиной (54) СПОСОБ ОБЖИГА ПРИ НИЗКОМ СОДЕРЖАНИИ ВОЛОКНА ДЛЯ ИЗГОТОВЛЕНИЯ ГИПСОВОЛОКНИСТОГО ЛИСТА (57) Реферат: Изобретение относится к области строительства, а именно к способам изготовления гипсоволокнистых листов. Изобретение позволит повысить прочность листов. Способ изготовления гипсоволокнистых листов с волокном целлюлозы включает добавление в гипс первой порции волокна целлюлозы перед совместным обжигом гипса и волокна целлюлозы в реакторе; добавление в суспензию после ее выпуска из реактора второй порции волокна целлюлозы с получением второй суспензии; укладывание суспензии для формирования ковра; ...

Process of aging calcined gypsum products and product thereof

Calcined gypsum and a method for its preparation

Patent GB1233436A

1,233,436. Treating calcined gypsum. UNITED STATES GYPSUM CO. 20 May, 1968, No. 23811/68. Heading C1A. Hot calcined gypsum is treated, while agitated, with water to reduce its average temperature to below the b.pt. of water, and then heated to at least 214‹ F. until the combined water content is that of CaSO 4À¢ H 2 O. Preferably sufficient water is added to reduce the temperature to 155-200‹ F. and to give a free water content of up to 3À5%. The mass may be agitated mechanically and by injecting air under pressure. It may be reheated to 215-425‹ F. The initial calcination may be effected in open kettles or rotary calciners, using gypsum rock ground to 90-95% minus 100 mesh, at a temperature of 250-500‹ F., to form CaSO 4.¢ H 2 O. CaOl 2 may be added before calcination.

Process for the preparation of calcined gypsum

Process for manufacturing ultra low consistency alpha- and beta- blend stucco

Process for continuously calcining gypsum to low dispersed consistency stucco

Wet chemical gypsum cake may be directly fed to a continuous kettle calciner to produce a stucco having lowered dispersed consistency. Pre-drying of the chemical gypsum is eliminated and the thus produced stucco may be used in the formulation of building plasters and in gypsum wallboard manufacture that will use less fuel for drying excess gauging water.

Method and apparatus for pressurized calcination of gypsum

A method for calcining gypsum in a pressurized reactor by injecting combustion gases and air into the pressurized reactor to create a fluidized bed of gypsum, and heating the fluidized bed of gypsum in the pressurized reactor sufficiently to form a calcined hemihydrate.

PROCESS FOR THE PREPARATION OF STABILIZED ANHYDRITE III FROM GIPS AND HYDRAULIC BINDER THUS OBTAINED THEREOF

Anhydrous gypsum powder and method for producing the same

Production of suppressively soluble calcium sulfate anhydride-11

(57)【要約】 【課題】 実質的に硬石膏−III が含まれることなく抑 制的に可溶な硫酸カルシウムの硬石膏−IIを得ることが できる方法を提供する。 【解決手段】 微細に粉砕された乾燥二水硫酸カルシウ ムが力焼装置内の蒸気雰囲気中で力焼温度に保持され適 当な熱作用によって脱水されて力焼材料が粉砕されるよ うにした、抑制的に可溶な硫酸カルシウム硬石膏−IIの 製造方法において、前記微細に粉砕された乾燥二水硫酸 カルシウムは、５８０°Ｃから６５０°Ｃに加熱され、 対応滞留時間に蒸気分圧を０．２ｂａｒ又はそれより小 さくした状態に保持することにより、抑制的に可溶な硫 酸カルシウム硬石膏−IIを主材として不溶な硫酸カルシ ウム硬石膏−II及び硫酸カルシウム硬石膏−III の混合 物相を形成してその混合物相の比表面積がブレーン法で ４０００cm 2 ／ｇ より大きくなるまで粉砕することを特 徴とする、抑制的に可溶な硫酸カルシウム硬石膏−IIの 製造方法。

A method of forming a gypsum based product

Treating calcined gypsum with solubilizing agent

A process for producing a healed stucco of low water demand in which calcined gypsum is treated with an aqueous solution of a gypsum solubilizing agent, preferably in an impacting blender while grinding the calcined gypsum to increase its surface area. The product can be dried for storage or sent directly to forming gypsum board.

Pure beta-hemihydrate production

In a beta -hemihydrate production process involving partially dehydrating dry finely divided dihydrate in a calcining assembly and then cooling, the calcined material is treated at 40-70 (preferably 50-60) deg C for 10-120 (preferably 30-60) minutes in a steam atmosphere to obtain practically pure beta -hemihydrate.

Calcium sulphate-based composition and methods of making same

Disclosed is an improved alpha calcium sulfate hemihydrate. Methods of producing an improved powdered calcium sulfate hemihydrate (CaSO 4 ·½H 2 O) [alpha-type] compound are disclosed, at least one method including forming calcium sulfate dihydrate (CaSO 4 ·2H 2 O) into a briquette under high pressure, calcining the briquette to transform the calcium sulfate dihydrate to calcium sulfate hemihydrate [alpha-type], drying the calcium sulfate hemihydrate [alpha-type] briquette, and optionally grinding the briquette. Also disclosed are methods of producing an improved gypsum plaster including producing the disclosed powdered calcium sulfate hemihydrate [alpha-type] and mixing the powdered calcium sulfate hemihydrate [alpha-type] with water.

Method of producing high strength calcined gypsum

Method for producing insoluble calcium sulfate anhydrite

Naturally occurring or man-produced calcium sulfate dihydrate is subjected to a process which involves concomitant flash calcination, utilizing co-current contact of the gypsum with a gaseous heat source, and self-comminutation to produce the insoluble calcium sulfate anhydrite in relatively pure and finely comminuted form without the use of specially-sized feed rock and extensive mechanically motivated grinding of the product required by prior means known in this art.

Process and appliance for calcining gypsum

The invention relates to a process for calcining fluidised, pulverulent or fine-grained material, especially gypsum, in indirect heat exchange with a heat transfer medium and in direct heat exchange with a fluidising gas, the heat being generated while combustion gas is produced. In order to be able to produce specific gypsum qualities in a controlled manner, the fluidising gas used is designed to be a gas separate from the combustion gas, especially air and/or steam, pressurised if appropriate. An appliance for carrying out the process contains, within a treatment chamber, a plurality of chamber sections and means for fluidising the material to different extents.

Stable alpha anhydrite-rich hydraulic binder

A hydraulic binder is thermally produced by subjecting calcium sulfate to complete dehydration and then rapid cooling. Production of a hydraulic binder based on natural or artificial calcium sulfate (gypsum, sulfo-gypsum, phospho-gypsum, titano-gypsum, etc.) is carried out by subjecting calcium sulfate to (a) complete dehydration, preferably at 200-350 deg C to form alpha anhydrite; and (b) rapid cooling, preferably with at least 140-290 deg C temperature reduction in less than 5 minutes by cold dry compressed air injection. An Independent claim is also included for a hydraulic binder obtained by the above process.

Method of producing calcium sulfate alpha-hemihydrate

A method of producing calcium sulfate α-hemihydrate is disclosed, including the steps of exposing a mixture including a calcium sulfate form selected from the group consisting of calcium sulfate dihydrate, calcium sulfate β-hemihydrate, water-soluble calcium sulfate anhydrite, and mixtures thereof, water, and a crystallization catalyst, to microwave radiation to produce calcium sulfate α-hemihydrate; and separating at least a portion of the calcium sulfate α-hemihydrate to provide a solid comprising calcium sulfate α-hemihydrate and a filtrate and/or remainder that can be recycled to provide at least one of a calcium sulfate form, water, a crystallization catalyst, a crystal habit modifier, and a surfactant for use in production of additional α-hemihydrate.

Process for manufacturing ultra low consistency alpha- and beta- blend stucco

A process is disclosed for making a blend of alpha- and beta-stucco including a slurry calcination step to produce alpha calcium sulfate hemihydrate followed by a fluidized bed calcination step to produce beta calcium sulfate hemihydrate. The process starts with 50-75% gypsum-containing solids slurry, and then steam calcines the slurry in a first reactor to form partially calcined gypsum slurry which contains calcium sulfate dihydrate and alpha calcium sulfate hemihydrate. The partially calcined slurry is then dewatered. Then the filter cake is fed into a kettle to complete the calcination process by converting the calcium sulfate dihydrate of the filter cake material into beta calcium sulfate hemihydrate.

Gypsum anhydrite fillers and process for making same

A process is disclosed for making dead burn calcium sulfate anhydrite. The process includes a slurry calcination step to produce calcium sulfate anhydrite followed by removing free water from the anhydrite while avoiding substantial rehydration. Also disclosed are dead burn calcium sulfate anhydrite particles with high aspect ratios, e.g. fibers having an average aspect ratio of at least 4:1, or very fine particle size, e.g., at or below 2 micrometers average, combined with very low water content, e.g., less than 0.5, preferably less than 0.3, wt. % water. These particles are typically useful as fillers.

Calcium sulphate-based compositions and methods of making same

Method of preparing stabilised anhydrite iii from plaster and, hydraulic binder thus obtained

Two-stage calcination method, and plant for same

Verfahren und Anlage zum Kalzinieren von Gips in einem zweistufigen Prozess. Vorgesehen sind eine erste Stufe (3) mit einer Flash-Kalzinierung und eine zweite Stufe zur Fertig-Kalzinierung in einem Reaktionsbehälter (6). Der Gips wird über eine Transferleitung (4) von der ersten zu der zweiten Stufe geführt. Erfindungsgemäß erfolgt ein indirektes Beheizen (65) des Reaktionsbehälters (6) der zweite Stufe, wobei ferner in der zweiten Stufe Wasserdampf rezirkuliert wird ohne Zuführung von externem Dampf und/oder Wasser. Mit ausgetriebenen Kristallwasser aus der zweiten Stufe steht ein autarker Wasserdampflieferant zur Verfügung, der durch eine Rezirkulationsanlage (7) vollständig zur Versorgung der zweiten Stufe mit dem erforderlichen Wasserdampf herangezogen werden kann. Damit kann ein hoher Wasserdampfanteil in der zweiten KalzinierStufe aufrechterhalten werden, ohne dass eine separate Dampferzeugung benötigt würde. Dadurch entsteht nur wenig oder kein Anhydrit. Damit kombiniert die Erfindung geringen Aufwand mit hoher Qualität. Method and plant for calcining gypsum in a two-stage process. Provided are a first stage (3) with a flash calcination and a second stage for final calcination in a reaction vessel (6). The gypsum is passed via a transfer line (4) from the first to the second stage. According to the invention, an indirect heating (65) of the reaction vessel (6) of the second stage, wherein further in the second stage water vapor is recirculated without supply of external steam and / or water. With expelled crystal water from the second stage is a self-sufficient water vapor supplier available, which can be used by a Rezirkulationsanlage (7) completely to supply the second stage with the required water vapor. Thus, a high water vapor content in the second calcination stage can be maintained without requiring separate steam generation. As a result, little or no anhydrite is formed. Thus, the invention combines little effort with high quality.

Efficient physical modification method for titanium gypsum

本发明公开了一种钛石膏高效物理改性的方法，包括以下步骤：钛石膏烘干；将钛石膏放在干燥箱内进行烘干，脱除钛石膏内部的自由水，烘干箱的温度为50℃‑60℃，本发明一种钛石膏高效物理改性的方法通过在钛石膏物理改性的制备步骤中新增了钛石膏均化步骤，通过将钛石膏粉料放置在窑炉内，保持160℃～180℃，对钛石膏粉料进行均化2h‑3h，对钛石膏进行均化处理，其化学成分趋于均一并扩散均化，钛石膏煅烧的产物β半水石膏、III型无水石膏和未脱水的二水石膏分布均匀，从而使得钛石膏粉料质地更加的均匀，显著增强了钛石膏碎屑的热稳定性，同时提高钛石膏的硬化后的强度。

Process for producing dry calcium-sulphate dihydrates from flue-gas gypsum

A process for producing dry calcium-sulphate hydrates by dewatering flue-gas desulphurisation plant gypsum is described. The treatment of the gypsum products is carried out in a fluidised-bed dryer with hot fluidisation gas, the dry gypsum being removed from the gas stream in a downstream dust separator, such as a cyclone separator. The gypsum products are in this case introduced into the fluidised-bed dryer, above the distribution base for the fluidisation gas flowing in from below, into a sand fluidised bed or a layer of another granular material with high heat capacity, such as metal beads, mineral grains or the like, and are specifically distributed directly above the distributor base, homogeneously over the entire cross-section thereof. The heat uptake takes place from the sand fluidised bed and the fluidisation gas, with a defined bed height, with horizontal penetration with simultaneous formation of steam.

Two-stage calcination process and plant therefor

Process and plant for the calcination of gypsum in a two-stage process. Provided are a first stage (3) comprising a flash calcination and a second stage for final calcination in a reaction vessel (6). The gypsum is passed from the first stage to the second stage via a transfer conduit (4). According to the invention, the reaction vessel (6) of the second stage is indirectly heated (65), and water vapor is also recirculated in the second stage without supplying external vapor and/or water. The expelled water of crystallization from the second stage provides an autonomous supply of water vapor which, via a circulation system (7), may be fully utilized for supplying the second stage with the required water vapor. Thus, a high water vapor proportion may be maintained in the second calcination stage with no need for a separate vapor generation. Accordingly, little, if any, anhydrite is formed. The invention accordingly combines low cost and complexity with high quality. Also encompassed is a retrofit reactor for the direct recirculation of the water vapor.

Two-stage calcination process and plant therefor

Described herein are a two-stage gypsum calcination process and a plant therefor. Provided are a first stage (3) comprising a flash calcination and a second stage for final calcination in a reaction vessel (6). The gypsum is passed from the first stage to the second stage via a transfer conduit (4). According to the invention, the reaction vessel (6) of the second stage is indirectly heated (65), and water vapor is also recirculated in the second stage without supplying external vapor and/or water. The expelled water of crystallization from the second stage provides an autonomous supply of water vapor which, via a circulation system (7), may be fully utilized for supplying the second stage with the required water vapor. Thus, a high water vapor proportion may be maintained in the second calcination stage with no need for a separate vapor generation. Accordingly, little, if any, anhydrite is formed. The invention accordingly combines low cost and complexity with high quality. Also encompassed is a retrofit reactor for the direct recirculation of the water vapor.

Two-stage calcination method, and plant for same

Process for the preparation of practically phase-pure calcium sulfate beta hemihydrate

Quick-hardening cement composition and method for producing the same

A method of building gypsum is prepared using power plant's solid waste desulfurized gypsum

本发明属于固废处理技术领域，特别涉及一种利用电厂固废脱硫石膏制备建筑石膏的方法。首先电厂固废脱硫石膏通过烘干、煅烧的方法制备建筑石膏，然后通过向石膏里面添加吸水性的生石灰，减弱吸湿对建筑石膏的影响，提高储存期及性能；具体包括以下步骤：烘干、煅烧、粉磨、混料；根据粒径差异，使生石灰包覆在石膏粉上，环境中的水分优先被石灰吸收，最后变成碳酸钙作为保护壳提高建筑石膏的耐水性；同时磷酸三钙作为抗结剂，阻止石膏粉的团聚；制备的建筑石膏具有储存时间长、耐水性高、强度大、抗冻性高的性质。

Gypsum processing device and method

FIELD: technological processes.SUBSTANCE: group of inventions relates to treatment of gypsum, and more specifically to activation of sediment of accumulated particles or gypsum powder. Gypsum processing device contains a reactor, a gypsum supply unit and a gas flow supply assembly. Reactor has inner wall surface with round or circular horizontal cross-section or configuration. Gypsum supply unit enables the gypsum powder supply to the reaction zone in the reactor. Gas flow supply unit is located in the lower part of the reaction zone. It provides ascending gas flow in reaction zone. As a result, the gypsum powder accumulated in the lower part of the reaction zone is capable of mixing. Device has multiple fixed blades passing to the inner wall surface from the holder located in the central part of the reaction zone. Blades are arranged to be spaced from each other by some angular interval in circumferential direction of said reaction zone. Adjacent blades form flow trajectory for gypsum powder and flow introduced into reaction zone. Flow path is inclined to deflect said flow radially outward and circumferentially in said reaction zone.EFFECT: technical result is higher efficiency of processing gypsum due to possibility of its processing using a fluidised bed, which enables to activate residue of gypsum powder accumulating in lower part of reaction zone.20 cl, 9 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 725 472 C1 (51) МПК C04B 11/036 (2006.01) C01F 11/46 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК C04B 11/036 (2020.02); C01F 11/46 (2020.02) (21)(22) Заявка: 2019106300, 14.07.2017 (24) Дата начала отсчета срока действия патента: Дата регистрации: (73) Патентообладатель(и): ЙОСИНО ДЖИПСУМ КО., ЛТД. (JP) 02.07.2020 (56) Список документов, цитированных в отчете о поиске: JP 2005/528310 A, 22.09.2005. RU 2355570 C2, 20.05.2009. RU 2157350 C2, 10.10.2000. US 5013237 A, 07.05.1991. US 4915623 A, 10.04.1990. ...

Gypsum calcining system and gypsum calcining method

本申请提供了一种石膏煅烧系统和石膏煅烧方法，石膏煅烧系统包括：送料系统；煅烧装置，包括一级煅烧装置和二级煅烧装置；改性机；中间输送装置；热源系统，提供热源介质，一级煅烧装置和二级煅烧装置至少之一的出风口与热源系统通过回流烟气管路连接，热源介质与来自回流烟气管路的回流烟气混合，为一级煅烧装置和二级煅烧装置提供所需的热量；和脱硝反应器。石膏煅烧方法采用前述的石膏煅烧系统，包括：将脱硫石膏送入一级煅烧装置中进行烘干；将一级煅烧装置烘干后的脱硫石膏送入二级煅烧装置中进行煅烧；将二级煅烧装置煅烧后的熟石膏粉送入改性机中粉磨；利用热源系统提供的热源介质与回流烟气混合，进行脱硝反应并提供热量。

FIRING METHOD AT LOW FIBER CONTENT FOR MANUFACTURE OF GYPSUM FIBER SHEET

1. Способ изготовления гипсоволокнистого листа, включающий следующие стадии: ! стадию, на которой водную суспензию, содержащую гипс и первую порцию волокон целлюлозы, подают в реактор, проводят реакцию гипса и первой порции волокна целлюлозы в реакторе для получения суспензии обожженного кристаллического гипса и волокна целлюлозы, ! стадию, на которой суспензию обожженного гипса и волокна целлюлозы равномерно армируют второй порцией волокна целлюлозы после стадии реактора для получения второй суспензии, ! стадию, на которой вторую суспензию укладывают для формирования ковра, ! стадию, на которой ковер обезвоживают, ! стадию, на которой сформированный ковер регидратируют в гипсоволокнистый ковер с волокном целлюлозы, и ! стадию, на которой сформированный ковер затем сушат, обрезают и отделывают в окончательный гипсоволокнистый лист. ! 2. Способ по п.1, отличающийся тем, что количество негидратированного полугидрата уменьшают более чем на 50% по сравнению с уровнем негидратированного полугидрата в окончательных листах, которые изготавливают путем обжига с гипсом всего волокна целлюлозы. ! 3. Способ по п.1, отличающийся тем, что окончательный лист получают с содержанием негидратированного полугидрата 0,0-3,0 мас.%. ! 4. Способ по п.1, отличающийся тем, что гипс подают в реактор в виде водной суспензии, и первую порцию волокна целлюлозы, которую добавляют в реактор, тоже добавляют в виде водной суспензии, и перед подачей в реактор эти две суспензии смешивают. ! 5. Способ по п.4, отличающийся тем, что в суспензию обожженного гипса и волокна целлюлозы добавляют вторую порцию волокна целлюлозы также в виде водной суспензии. ! РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2010 127 050 (13) A (51) МПК E04F 15/022 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (71) Заявитель(и): ЮНАЙТЕД СТЭЙТС ДЖИПСУМ КОМПАНИ (US) (21)(22) Заявка: 2010127050/03, 18.12.2008 Приоритет(ы): (30) Конвенционный приоритет: 20.12.2007 US 11/962,031 (85) Дата начала ...

Production process of alpha high-strength gypsum

本发明属于固体废弃物综合利用领域，具体涉及工业副产石膏的回收利用领域，更具体涉及一种α高强石膏的生产工艺，包括以下步骤：向工业副产石膏中加水搅拌，至工业副产石膏呈半干塑状，再经均化陈化、打散处理后，加入石膏晶种、媒晶剂，并加水搅拌至混合物料呈半干塑状，随后进行装盘布料入反应釜，通入蒸汽，在120～140℃下，进行湿热脱水反应2～3h后制得α高强石膏。由本发明制得的α高强石膏均能达到JC/T2038‑2010标准中对α高强石膏的最低强度要求，并且，本发明制备α高强石膏的方法具有成本低、绿色节能的优点。

A method of forming a gypsum based product

本发明公开了形成基于石膏的产品的方法。所述方法包括如下步骤：将水和石膏的混合物在容器内在升高的温度和压力的条件下煅烧以在其中产生α-半水合物浆料；将所述α-半水合物浆料从所述容器传到混合器用于与另外的水混合以产生能凝结的浆料，所述能凝结的浆料被安排凝结以形成所述基于石膏的产品。

Method of producing binder from phosphogypsum

Изобретение относитс  к способу получени  в жущего из фосфогипса и может найти применение в промышленности строительных материалов. Цель изобретени  - повышение прочности. Способ получени  в жущего из фосфогипса включает перемешивание его с добавкой - продуктом взаимодействи  эквимол рных количества дипиновой кислоты и гексаметилендиамина-солью АГ в количестве 0,5-1% от массы фосфогипса, последующие брикетировани  под давлением 20-100 МПа и термообработку насыщенным паром при избыточном давлении 0,15-0,25 МПа в течение 4-10 ч. Прочность в жущего при сжатии 36,2 МПа, при изгибе 14,1 МПа. 2 табл. This invention relates to a method for producing a phosphogypsum stubble and can be used in the building materials industry. The purpose of the invention is to increase the strength. The method of obtaining a phosphogypsum carrier includes mixing it with an additive — a product of interaction between equimolar amounts of dipic acid and hexamethylenediamine-AH salt in an amount of 0.5-1% by weight of phosphogypsum, subsequent briquetting under pressure of 20-100 MPa and heat treatment with saturated steam with excess pressure of 0.15-0.25 MPa for 4-10 hours. The strength of the compressive strength is 36.2 MPa, and the bending is 14.1 MPa. 2 tab.

Treating calcined gypsum with solubilizing agent

Polyphase gypsum binder and method for preparing it

ÐÎÑÑÈÉÑÊÀß ÔÅÄÅÐÀÖÈß RU (19) (11) 2007 131 242 (13) A (51) ÌÏÊ C04B 11/024 (2006.01) ÔÅÄÅÐÀËÜÍÀß ÑËÓÆÁÀ ÏÎ ÈÍÒÅËËÅÊÒÓÀËÜÍÎÉ ÑÎÁÑÒÂÅÍÍÎÑÒÈ, ÏÀÒÅÍÒÀÌ È ÒÎÂÀÐÍÛÌ ÇÍÀÊÀÌ (12) ÇÀßÂÊÀ ÍÀ ÈÇÎÁÐÅÒÅÍÈÅ (21), (22) Çà âêà: 2007131242/03, 16.08.2007 (43) Äàòà ïóáëèêàöèè çà âêè: 27.02.2009 Áþë. ¹ 6 (71) Çà âèòåëü(è): Çàêðûòîå Àêöèîíåðíîå îáùåñòâî "Òåõíî-ÒÌ" (RU) Àäðåñ äë ïåðåïèñêè: 123007, Ìîñêâà, à/ 79, Â.Þ. Ìàëþøêèíîé A àíãèäðèòîâîå â æóùåå èçâåñòü ãàøåíà 3,0-29,0 R U 20,0-50,0 óêàçàííîå âûñîêîïðî÷íîå ãèïñîâîå â æóùåå 0-10,0 óêàçàííà èçìåëü÷åííà ðåãóëèðóþùà 0,5-2,0 àêòèâèðóþùà äîáàâêà â âèäå ñìåñè, ñîäåðæàùåé ñóëüôàò êàëè ñóëüôàò àëþìèíè 2,0-5,0 5,0-30,0 òðèïîëèôîñôàò íàòðè óêàçàííûé îðãàíè÷åñêèé êîìïîíåíò 8,0-15,0 50,0-85,0 2. Ïîëèôàçíîå ãèïñîâîå â æóùåå ïî ï.1, îòëè÷àþùååñ òåì, ÷òî äîïîëíèòåëüíî ñîäåðæèò äðóãèå õèìè÷åñêèå ìîäèôèêàöèè íà îñíîâå åñòåñòâåííîãî ãèïñà, èëè ãèïñà, ïîëó÷åííîãî õèìè÷åñêèì ïóòåì, èëè ãèïñà, ïîëó÷åííîãî ïðè îáåññåðèâàíèè äûìîâûõ ãàçîâ. 3. Ñïîñîá ïîëó÷åíè ïîëèôàçíîãî ãèïñîâîãî â æóùåãî ïî ï.1, âêëþ÷àþùèé ïîñëåäîâàòåëüíîå ñìåøåíèå àíãèäðèòîâîãî â æóùåãî ñ èçâåñòüþ ãàøåíîé è ïðåäâàðèòåëüíî ïðèãîòîâëåííîé è èçìåëü÷åííîé ðåãóëèðóþùåé äîáàâêîé ïðè ïåðåìåøèâàíèè, è ïîñëåäóþùåå ââåäåíèå â ïîëó÷åííóþ ñìåñü ñòðîèòåëüíîãî ãèïñîâîãî â æóùåãî è ïðè íåîáõîäèìîñòè âûñîêîïðî÷íîãî ãèïñîâîãî â æóùåãî ïðè ïåðåìåøèâàíèè. Ñòðàíèöà: 1 A 2 0 0 7 1 3 1 2 4 2 óêàçàííîå ñòðîèòåëüíîå ãèïñîâîå â æóùåå RU 40,0-60,0 2 0 0 7 1 3 1 2 4 2 (57) Ôîðìóëà èçîáðåòåíè 1. Ïîëèôàçíîå ãèïñîâîå â æóùåå, âêëþ÷àþùåå àíãèäðèòîâîå â æóùåå, èçâåñòü ãàøåíóþ, ñòðîèòåëüíîå ãèïñîâîå â æóùåå íà îñíîâå áåòà-ïîëóãèäðàòà ñóëüôàòà êàëüöè , ïðè íåîáõîäèìîñòè âûñîêîïðî÷íîå ãèïñîâîå â æóùåå íà îñíîâå àëüôà-ïîëóãèäðàòà ñóëüôàòà êàëüöè , à òàêæå èçìåëü÷åííóþ ðåãóëèðóþùóþ àêòèâèðóþùóþ äîáàâêó, ïðåäñòàâë þùóþ ñîáîé ñìåñü ñóëüôàòà êàëè , ñóëüôàòà àëþìèíè , òðèïîëèôîñôàòà íàòðè è îðãàíè÷åñêîãî êîìïîíåíòà, âûáðàííîãî èç ãðóïïû, âêëþ÷àþùåé ïîëèêàðáîêñèëàò íàòðè , íàòðèåâóþ ñîëü ñóëüôèðîâàííîé íàôòàëèí-ôîðìàëüäåãèäíîé ...

Method and installation for the dehydroxylation treatment of aluminium silicate

Plastering devices and methods of plastering

[과제] 유동층 방식의 석고 처리 장치 및 석고 처리 방법에 있어서, 석고분체의 유동성을 활성화시키거나 향상시키고, 석고분체의 개질 또는 균질화 등의 석고 처리의 작용을 촉진한다. [해결 수단] 석고 처리 장치(1)는, 반응기(2)와, 조정공기 공급구멍(6)과, 조정공기류(Af)를 반응역(α)으로 위쪽 방향으로 유입되게 하는 수평 격벽(5)과, 반응역의 둘레 방향으로 각도 간격을 사이에 두고 배열된 복수의 고정 날개(10)를 가지고 있다. 소석고(Gb)의 유동층(M)이 반응기 내에 형성된다. 고정 날개는, 반응역으로 위쪽 방향으로 유입된 조정공기류(Ag)를 반응역의 직경 방향 외측으로 또한 둘레 방향으로 편향시킨다. 소석고(Gb)는, 조정공기류에 의해 반응기 내에서 도약 유동 또는 도약 이동한다. [Problem] In a fluid bed type gypsum treatment apparatus and a gypsum treatment method, the fluidity of the gypsum powder is activated or improved, and the action of the gypsum treatment such as modification or homogenization of the gypsum powder is promoted. [Solution Means] The gypsum treatment apparatus 1 includes a reactor 2, a conditioning air supply hole 6, and a horizontal bulkhead 5 for allowing the conditioning air flow Af to flow upwardly into the reaction zone α. ) and a plurality of stator blades 10 arranged with angular intervals therebetween in the circumferential direction of the reaction region. A fluidized bed (M) of calcined gypsum (Gb) is formed in the reactor. The stator blade deflects the regulating air flow Ag introduced in the upward direction into the reaction zone outward in the radial direction and in the circumferential direction of the reaction zone. The calcined gypsum (Gb) jumps or jumps in the reactor by the control air flow.

Automatic control method and system for gypsum powder calcination feeding

本发明公开了一种石膏粉煅烧供料自动控制方法及系统。所述方法包括：设定煅烧装置出料口的目标温度及基于所述目标温度的第一温度范围；获取煅烧装置出料口的实时温度，当所述实时温度大于所述第一温度范围的上限值或小于所述第一温度范围的下限值时，将所述实时温度与所述目标温度之差进行比例积分微分PID运算后输出控制信号；将所述控制信号发送至供料装置。本发明提供的石膏粉煅烧供料自动控制方法及系统，能够设定煅烧装置出料口的目标温度，根据目标温度和采集的煅烧装置出料口的实时温度的差值，对供料装置向煅烧装置输送的物料量进行调整，达到自动控制输入煅烧装置的物料量并使煅烧装置出料口的温度处于设定的范围内。

Method and device for treatment of powdery material based on calcium sulfate, new hydraulic binder

FIELD: methods and device for treatment of powdery material based on calcium sulfate for production of hydraulic binder. SUBSTANCE: method consists in combination of two successive stages of treatment: (a) heating of powdery material in roasting tunnel 1 up to temperature of 220-360 C under conditions for formation, mainly, of alpha-modification of calcium sulfate; (b) thermal strengthening of material heated in said manner in cooling device 2 with help of cold and dry gas to stabilize alpha-anhydrite and blocking of its conversion into some other crystallographic modification. EFFECT: provided production of new hydraulic binder with content of alpha-anhydrite in excess of 35 wt.% and improved strength characteristics of binder and its higher fire resistance. 17 cl, 8 dwg О95$Д9Сс ПЧ сэ (19) РОССИЙСКОЕ АГЕНТСТВО ПО ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ ВИ "” 2157 350‘ С 04 В 11/02, 11/032, 11/05, (51) МПК? 13) С2 11/06 12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ (21), (22) Заявка: 97119184/03, 24.04.1996 (24) Дата начала действия патента: 24.04.1996 (30) Приоритет: 25.04.1995 ЕК 9505189 (46) Дата публикации: 10.10.2000 (56) Ссылки: ЕК 2572721 А, 09.05.1986. ЗИ 94896 А, 22.01.1957. ЗЧ 1183415 А, 07.10.1985. МО 88/065 73 А, 02.03.1988. СВ 1111711 А, 01.05.1968. СВ 1399533 А, 02.07.1975. СВ 2084130, 07.04.1982. \!О 900811 А, 26.07.1990. \М!О 9415161 А, 07.07.1994. (85) Дата перевода заявки РСТ на национальную фазу: 25.11.1997 (86) Заявка РСТ: ЕК 96/00622 (24.04.1996) (87) Публикация РСТ: \М/О 96/33957 (31.10.1996) (98) Адрес для переписки: 129010, Москва, ул. Большая Спасская 25, стр.3, ООО "Городисский и Партнеры", Томской Е.В. (71) Заявитель: Кристиан ДЮССЕЛЬ (ЕК) (72) Изобретатель: Кристиан ДЮССЕЛЬ (ЕК) (73) Патентообладатель: Кристиан ДЮССЕЛЬ (ЕК) (54) СПОСОБ И УСТРОЙСТВО ДЛЯ ОБРАБОТКИ ПОРОШКООБРАЗНОГО МАТЕРИАЛА НА ОСНОВЕ СУЛЬФАТА КАЛЬЦИЯ, НОВОЕ ГИДРАВЛИЧЕСКОЕ ВЯЖУЩЕЕ (57) Изобретение касается способа обработки порошкообразного материала на основе сульфата кальция ...

METHOD OF MANUFACTURE OF PLASTER BRAIN

A kind of crystal modifier and the purposes that alpha type high-strength gypsum is prepared using it

提供一种转晶剂，其为具有式(I)结构的化合物、具有式(I)结构的化合物的盐和具有式(II)结构的化合物中的任意1种或至少2种的组合，其中，R 1 、R 2 、R 3 、R 4 、R 5 、R 6 、R 7 和R 8 均各自独立地选自有机基团；R’为甲基；n为0或1。该转晶剂在水中具有像钳子一样的两个羧酸基团，其能够在α‑CaSO 4 ·0.5H 2 O晶体的(114)面上产生强烈的吸附作用。由该转晶剂制备的α型高强石膏的晶体长径比在1:0.5～1:3范围内，其具有5.0MPa以上的2小时抗折强度，43MPa以上的烘干抗压强度。

Method for preparation of anhydrite binder

FIELD: chemistry. SUBSTANCE: invention refers to the technology of preparation and application of anhydrite binders based on the anhydrous calcium sulphate. The method includes the disintegration of the gypsum stone, its loading to the conveying lattice and layer burning by the updraft of hot gases from fuel burning with following fine grinding of the calcinated product. The gypsum stone is beforehand diluted with 5-10 wt % of limestone and ground up to the powdery condition. The obtained mixture is moistened with obtaining of the pellets having size 6-8 mm and undergoes the level burning on the conveying lattice with beforehand laying on the lattice of the "bedding" (the layer of calcinated product pellets with thickness 40-60 mm). The 5-8% of oil coke are additionally fed into the mixture of gypsum stone and limestone. Then the pellets layer made of cement raw mixture and oil coke is laid over "bedding" on the conveying lattice and atop of it the layer of pellets made of gypsum stone, limestone and oil coke is laid with ratio of the cement and gypsum layers being 1:1-1.2 respectively. The calcination products of these mixtures are ground up together with 10-12 wt % of the complex additive consisting of 1 part of plastifier and 9 parts of silica component - microsilica or acid CHP-plant ash. EFFECT: more full raw materials use, simplification of the binder preparation technology, acceleration and cheapening of calcinations process, enhancing of the water stability and resistibility of anhydrite binder. 4 cl, 1 tbl, 4 ex РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 362 748 (13) C1 (51) МПК C04B 11/05 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21), (22) Заявка: 2007141972/03, 12.11.2007 (24) Дата начала отсчета срока действия патента: 12.11.2007 (45) Опубликовано: 27.07.2009 Бюл. № 21 (73) Патентообладатель(и): Государственное образовательное учреждение высшего ...

Method of obtaining fibrous calcium sulfate

Method for plaster-based product manufacture

FIELD: chemistry. SUBSTANCE: method comprises the following steps: plaster and water mixture calcining at elevated temperature and pressure in a vessel to obtain an alpha-hemihydrate suspension; alpha-hemihydrate suspension transmission from the tank to the mixer for mixing with additional water to provide a curable suspension, which forms a plaster-based product upon solidification; alpha-hemihydrate suspension transmission from the tank to the mixer comprises the step of alpha-hemihydrate suspension temperature maintaining at a level above 70°C. EFFECT: possibility of application of the allocated hot water power for plaster pre-heating prior to introduction into the container for firing, and the suspension is quickly cooled to a temperature favourable for particles hydration. 13 cl, 1 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 621 238 C2 (51) МПК C04B 11/032 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ФОРМУЛА (21)(22) Заявка: ИЗОБРЕТЕНИЯ К ПАТЕНТУ РОССИЙСКОЙ ФЕДЕРАЦИИ 2014128767, 13.12.2012 (24) Дата начала отсчета срока действия патента: 13.12.2012 (72) Автор(ы): МОНГРОЛЬ Жан-Луи (FR), ЖЕРМЕН Жан-Люк (FR) (73) Патентообладатель(и): СЕН-ГОБЕН ПЛАКО САС (FR) Дата регистрации: (56) Список документов, цитированных в отчете о поиске: US 4965031 A, 23.10.1990. GB Приоритет(ы): (30) Конвенционный приоритет: 15.12.2011 GB 1121589.4 (45) Опубликовано: 01.06.2017 Бюл. № 16 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 15.07.2014 (86) Заявка PCT: EP 2012/075353 (13.12.2012) (87) Публикация заявки PCT: 2 6 2 1 2 3 8 (43) Дата публикации заявки: 10.02.2016 Бюл. № 4 2213810 A, 23.08.1989. US 3576599 A, 27.04.1971. DE3927927 A1, 28.02.1991. ВОЛЖЕНСКИЙ А.В. Гипсовые вяжущие и изделия. - М.: Стройиздат, 1974 - с.53-59. R U 01.06.2017 2 6 2 1 2 3 8 R U Адрес для переписки: 191002, Санкт-Петербург, а/я 5, ООО "Ляпунов и партнеры" (54) Способ получения продукта на основе гипса (57) Формула изобретения 1. Способ получения продукта на основе ...

A kind of industry by-product gypsum calcinatory

本发明公开了一种工业副产石膏煅烧器，包括煅烧室；所述的煅烧室一侧上端安装入料口，另一侧下端安装出料口；所述的煅烧室内设有多个溢流调节板；所述的多个溢流调节板均匀安装在煅烧室内；所述的溢流调节板将煅烧室分隔呈多个煅烧腔；所述的煅烧腔内安装有换热系统；所述的换热系统包括蒸汽管道、安装在蒸汽管道外侧的翅片；所述的蒸汽管道呈至上而下的弯曲结构；所述的蒸汽管道上端为蒸汽接入口，下端为冷凝水出口。本发明提供一种受热均匀、温度恒定、停留时间短、传热效率高、能耗低的工业副产石膏煅烧器。

PROCESS FOR THE PRODUCTION OF SETTING CAPABLE CALCIUM SULPHATES FROM FINE PARTICULATE CALCIUM SULPHATES

Process for the preparation of practically phase-pure calcium sulfate beta hemihydrate

Process for the preparation of calcium sulfate beta hemihydrate

A kind of flue gas of sintering machine dust collecting process and device

本发明公开了一种烧结机烟气脱硫除尘工艺及装置，烟气脱硫除尘工艺包括以下步骤：（1）将烧结机烟气分为低硫段烟气和高硫段烟气；（2）对低硫段烟气进行半干法脱硫，脱硫后的气体再经除尘，得到烟气A；对高硫段烟气经除尘后，再对烟气进行湿法脱硫，得到烟气B；（3）将烟气A和烟气B混合后排放。采用半干法脱硫和湿法脱硫相结合，将半干法脱硫灰用于湿法脱硫，有效地解决了半干法脱硫灰难以处置和湿法脱硫烟气夹带水雾问题。

Patent JPS4927753B1

Method of obtaining gypsum

Process for producing .ALPHA.-calcium sulfate hemihydrate from calcium sulfate dihydrate.

Method and device for calcination of gypsum under pressure

FIELD: chemistry. SUBSTANCE: invention can be used in chemical industry. Method of gypsum calcination includes stages at which: gypsum is introduced into reactor under pressure 27, fuel and air are burnt in burner 41 with formation of gaseous products of combustion. After that, part of gaseous products of combustion and air are supplied to reactor under pressure 27 with creation of fluidised bed of gypsum in reactor. After that, remaining part of gaseous products of combustion is directed into heat exchanger 52, which is applied for heating of fluidised bed and fluidised bed of gypsum is heated in reactor under pressure 27 for sufficient calcination of gypsum with formation of calcinated semihydrate. EFFECT: invention makes it possible to obtain alpha-semihydrate of calcium sulfate with reduced fuel consumption. 8 dwg, 1 tbl РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 506 227 (13) C2 (51) МПК C01F C04B C04B B01J B01J 11/46 (2006.01) 11/02 (2006.01) 11/028 (2006.01) 8/24 (2006.01) 3/00 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2010136669/05, 17.02.2009 (72) Автор(ы): ЛЮАН Уэнги (US), ЛИУ Ксингксиа (US) (24) Дата начала отсчета срока действия патента: 17.02.2009 R U (73) Патентообладатель(и): ЮНАЙТЕД СТЭЙТС ДЖИПСУМ КОМПАНИ (US) Приоритет(ы): (30) Конвенционный приоритет: 19.02.2008 US 61/029,725 23.10.2008 US 61/107,901 (43) Дата публикации заявки: 27.03.2012 Бюл. № 9 2 5 0 6 2 2 7 (45) Опубликовано: 10.02.2014 Бюл. № 4 2 5 0 6 2 2 7 R U (85) Дата начала рассмотрения заявки PCT на национальной фазе: 20.09.2010 C 2 C 2 (56) Список документов, цитированных в отчете о поиске: US 6896858 B2, 24.05.2005. US 4919613 A, 24.04.1990. US 6964704 B2, 15.11.2005. US 6491501 B1, 10.12.2002. US 4569831 A, 11.02.1986. US 5139749 A, 18.08.1992. RU 98117509 A, 20.06.2000. SU 361556 A3, 07.12.1972. (86) Заявка PCT: US 2009/034282 (17.02.2009) (87) Публикация заявки РСТ: WO 2009/105424 (27.08.2009) Адрес для переписки: ...

Method of producing alpha-hemihydrate of calcium sulphate from dehydrate of calcium sulphate

FIELD: chemistry. SUBSTANCE: invention relates to methods of producing alpha-hemihydrate of calcium sulphate. The method involves loading dehydrate of calcium sulphate into an autoclave with a mixer, indirect heating of the autoclave, controlled addition and admixing water, prevention of adherence of material to the surface of the reaction space via movable chains fitted on blades and/or driven shaft of the autoclave with a mixer, periodic or continuous control of pressure in the reaction space by releasing vapour when pressure inside reaches a certain level, where vapour is moves through a cyclone separator and a servovalve, feeding cold air for post-drying and removing spent material. The method is realised using apparatus which has an autoclave with a mixer, having double walls and heated indirectly, spray nozzles distributed on the jacket of the autoclave, freely hanging chains attached in the region of the mixer, a cyclone separator, as well as a Venturi scrubber fitted outside the autoclave with a mixer. EFFECT: high reliability of the apparatus, low power consumption. 13 cl, 2 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) 2 415 818 (13) C1 (51) МПК C04B 11/028 (2006.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ, ПАТЕНТАМ И ТОВАРНЫМ ЗНАКАМ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (21)(22) Заявка: 2009148040/03, 20.05.2008 (24) Дата начала отсчета срока действия патента: 20.05.2008 (72) Автор(ы): ЕГЕР Райнхард (DE), БРОЗИГ Альфред (DE) R U (73) Патентообладатель(и): ГРЕНЦЕБАХ-БСХ ГМБХ (DE) Приоритет(ы): (30) Конвенционный приоритет: 24.05.2007 DE 102007024188.9 (45) Опубликовано: 10.04.2011 Бюл. № 10 2 4 1 5 8 1 8 (56) Список документов, цитированных в отчете о поиске: ЕР 0572781 А1, 08.12.1993. SU 885179 A1, 30.11.1981. SU 296725 А1, 02.03.1971. RU 2212384 C1, 20.09.2003. DE 9529670, 22.11.1956. ЕР 0672634 A2, 20.09.1995. 2 4 1 5 8 1 8 R U (86) Заявка PCT: DE 2008/000854 (20.05.2008) C 1 C 1 (85) Дата начала рассмотрения заявки PCT на национальной фазе: 24.12. ...

Production equipment for calcining building gypsum by phosphogypsum

一种磷石膏煅烧建筑石膏的生产设备，属于磷石膏煅烧领域，包括阳光棚，前中和装置，第一输送装置，综合炉，第二输送装置，匀化装置，包覆装置，成品仓，第三输送装置，煅烧炉，第四输送装置，余热自煅烧仓体，第五输送装置，第六输送装置，喷火炉，除尘器，第七输送装置；具有结构紧凑合理，能够保证磷石膏煅烧质量的一致性的特点。

Production method of alpha-type semi-hydrated gypsum

本发明涉及一种α型半水石膏的生产方法，将干燥的二水石膏和溶解有α型半水石膏催化剂的水均匀混合成为湿润的待反应物料，上述待反应物料与二甲基硅油混合形成浆料，注入高压反应釜中，在搅拌条件下反应完全；反应完全后的浆料排出至具有保温结构的容器，持续搅拌，释放浆料中的水汽并使油、汽分离；排完水汽的浆料通过真空干燥，将α型半水石膏和二甲基硅油分离。分离后的α型半水石膏经过粉磨成为成品，分离后的二甲基硅油用于循环生产。本发明用甲基硅油代替原来的工艺用水，可以提高α型半水石膏“液相法”生产中固体原料和成品的比例，以及提高生产设备的有效容积和生产效率，降低生产能耗和生产线的投资。

Method of producing phosphoric acid calcium sulphate dehydrate

Guide device for measurement of semiconductive device

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

Drying and recycling device for desulfurized gypsum

本发明公开了一种脱硫石膏的烘干回收装置，包括热风机、电机一、打散筒、烘干筒和电机二，所述打散筒内安装有与其同轴的打散轴，打散轴由电机一驱动转动，打散轴的表面固定有多段螺旋状的送料叶片，相邻段送料叶片之间设有多个齿牙，齿牙分别固定在打散轴和打散筒的内壁上，打散筒通过多个安装座安装在烘干筒上，打散筒的一端通过下料管与烘干筒连接，本发明的有益效果是：其能对脱硫石膏进行先一步的打散，之后再进行烘干，热风机能对打散筒内的脱硫石膏进行除水作业，而且其还能对脱硫石膏的运动起到正向促进作用，抄料板的设置能带动粉碎后的脱硫石膏进行扬起和下落，使得脱硫石膏粉末与热风的接触面积增加，便于提升烘干效果。

Method for preparing phosphorus building gypsum through screening and calcining

本发明公开了一种筛分煅烧制备磷建筑石膏的方法。本发明为废弃磷石膏的工业化规模处理和综合利用开辟新途径，操作工艺简单、操作成本低、除杂效果好、对环境污染少、节省水资源。具体的：通过特定的目数，将磷石膏按照不同的粒径进行筛分；该目数下筛分的不同粒径磷石膏，配合不同温度下快速高温煅烧的方法可以选择性地将有机质，游离磷及共晶磷这些主要杂质高温分解或转变为惰性物质，从而消除了这些杂质对磷建筑石膏性能的危害，同时保证了二水硫酸钙的正常脱水反应，并最终制备出杂质较少、性能较优的磷建筑石膏。

PROCESS AND PLANT FOR THE TREATMENT OF ALUMINUM SILICATE DEHYDROXYLATION

SPHERICAL GYPSUM AND ITS PREPARATION PROCESS

L'invention a pour objet du gypse sphérique obtenu à partir de gypse fibreux dont les fibres s'entrelacent, préparé par un procédé consistant à soumettre, en poids, de 0,5 à 80 % de gypse semi-hydraté de type beta , ou de 5 à 80 % de gypse dihydraté, ou de 5 à 80 % d'un mélange de ces gypses à une réaction hydrothermique dans un milieu acide, ces proportions étant exprimées par rapport au poids du milieu acide. The invention relates to spherical gypsum obtained from fibrous gypsum whose fibers intertwine, prepared by a process consisting in subjecting, by weight, from 0.5 to 80% of beta-type hemi-hydrated gypsum, or from 5 to 80% of gypsum dihydrate, or from 5 to 80% of a mixture of these gypsum in a hydrothermal reaction in an acidic medium, these proportions being expressed relative to the weight of the acidic medium.

Plaster manufacturing process

PROCESS FOR THE AQUEOUS PREPARATION OF PURIFIED CALCIUM SULFATE

Process and installation for producing plaster from gypsum by calcination by direct contact with hot carrier gases.

Procédé de production de plâtre semi-hydrate par calcination du gypse naturel ou synthétique dans au moins une zone cyclonique, selon lequel le gypse et les gaz chauds sont introduits dans la partie supérieure de la première zone cyclonique, et la calcination est conduite dans un courant parallèle des gaz chauds des particules des matières à déshydrater par circulation selon le sens descendant suivant un mouvement cyclonique dans chaque zone cyclonique et ensuite par circulation dans la zone centrale de chaque zone cyclonique selon le sens ascendant. L'invention a également pour objet une installation pour la mise en œuvre de ce procédé. A method of producing hemihydrate plaster by calcining natural or synthetic gypsum in at least one cyclonic zone, wherein the gypsum and hot gases are introduced into the upper part of the first cyclonic zone, and the calcination is carried out in a stream parallel of the hot gases of the particles of the materials to be dehydrated by circulation in the descending direction following a cyclonic movement in each cyclonic zone and then by circulation in the central zone of each cyclonic zone in the ascending direction. The subject of the invention is also an installation for implementing this method.