Dolomite wet process comprehensive utilization technique

The invention discloses a process of wet comprehensive utilization of dolomite, more specifically relates to a process for wet treatment of the dolomite to produce calcium and magnesium products, namely, the dolomite or incinerated dolomite powder is directly leached with sulfate acid to separate the calcium and the magnesium in the dolomite. The calcium precipitates in the form of calcium sulfate and the magnesium enters a solution in the form of magnesium sulfate; then magnesium hydroxide and calcium sulfate products are prepared from the magnesium solution after metathetical reaction and neutralization reaction. The intermediate product, calcium chloride, of the invention can be recycled, so the process is basically free of three-waste discharge and has notable environmental benefit; the invention, besides, significantly lowers the resource consumption and has obvious economic benefit.

Process for making cupric sulfate by low temp. air oxidation and dissolution

Preparation method of styliform nano calcium carbonate

The invention relates to a preparation method of an acicular nanometer calcium carbonate which does not use a refrigerator, mixes a certain quantity of quick lime with hot water in the proportion of 1:4-10 under the condition of higher temperature and higher concentration of the lime white which are filtered and removed the residue. Before carbonizing, the solution is adjusted to the needed concentration and the temperature, then is added with the crystal-directing agents, then is evenly stirred and then is placed into a carbonation reactor, reacting with the mixed air pumped containing CO2 15-40 percent is pumped. The reaction is stopped when the pH equals to 6.5-7. The reaction solution is prepared to obtain acicular nanometer calcium carbonate by dewatering, cleaning, drying, surface processing, grinding and sieving. The invention has the advantages of realizing an industrial production by adopting the industry bubbling shaped carbonization device as well as utilizing the crystal-directing ...

Method for preparing magnesium hydroxide with coproduction of calcium chloride

The invention relates to a method for preparing magnesium hydroxide with joint production of calcium chloride which is that magnesium chloride and lime milk are adopted as the raw material; solubility difference between reactant and product in the water are utilized; the process flow is reasonably arranged; double decomposition reaction is completed with the method of removing calcium agent; the content of calcium oxide in product magnesium hydroxide is less than 0.5 percent; utilization ratio of the magnesium reaches more than 95 percent. Compared with the magnesium hydroxide method, the invention has low production cost with calcium chloride as byproduct and also has high conversion rate of the magnesium compared with ammonia method, with no discharging of nitrogen wastewater with the ammonia and no air pollution. The invention realizes the zero discharge of the water by regularly recycling lavage fluid and the water with remarkable environmental and economic benefits.

Indoor air cleaning agent filled paired components

The present invention discloses a kind of indoor air smell-cleaning agent, including two portions of component A and component B. The compount A is a solid active agent formed from one or several kinds of oxalic acid, tartaric acid, amino acid, citric acid, aminosulfonic acid, isonicotinic acid and camphoric acid, and the component B is a stable solution formed from one or several kinds of potassium chlorate, sodium chlorate, magnesium chlorate, sodium hypochlorite, calcium hypochlorite, sodium chlorite, sodium perchlorate, potassium perchlorate, sodium dichloroisocyanurate and sodium trichloroisocyanurate. The component A can be added in the component B. The substances of nascent state oxygen, nascent state chlorine or chlorinedioxide can be released so as to eliminate harmful smell pollution due to building, decoration and furniture in the room.

Technology for producing active magnesium oxide

The invention relates to a technology for producing active magnesium oxide, comprising the following steps: adding a pre-pyrolysis device on the basis of the technology for producing active magnesium oxide by the traditional carbonization process; introducing dry tail gas obtained by drying light magnesium carbonate to the pre-pyrolysis device, carrying out direct heat exchange with heavy magnesium water, recovering heat in the tail gas, raising temperature of the heavy magnesium water from 10-30 DEG C to 40-55 DEG C and conveying heated heavy magnesium water to the pre-pyrolysis device for complete pyrolysis.In the invention, heat in the dry tail gas is recovered, temperature of heavy magnesium water is raised, primary energy consumption of unit product is lowered, magnesium carbonate dust carried in the dry tail gas is recovered, so that environmental pollution is reduced and multiple purposes are achieved.In addition, the economic and environmental benefits of the technology are remarkable ...

Method of producing magnesium hydroxide

The invention discloses a preparation method of magnesium hydroxide by using magnesium sulfate and lime milk as raw materials, and the invention has the concrete process that a magnesium sulfate solution with a certain concentration can be used to conduct the metathesis reaction with a calcium chloride solution to produce the magnesium chloride solution and calcium sulfate precipitation; the filter mass is washed and dried after the solid-liquid separation to generate calcium sulfate products; the filter liquid continues to counteract with lime milk with a certain concentration to produce thecalcium chloride solution and the magnesium hydroxide precipitation; and then the filter mass is washed, dried and crashed after the solid-liquid separation to generate magnesium hydroxide products; and then the filter liquid returns to the metathesis reaction for recycling. The invention with low producing cost remarkably improves environmental and economic benefits.

Method of producing magnesium hydroxide

PROCESS FOR MAKING CUPRIC SULFATE BY LOW TEMP. AIR OXIDATION AND DISSOLUTION

The present invention refers to process for preparation of cupric sulfate. It uses novel copper-corrosion promoter for rapid air oxidation of copper, whether red copper or fine copper ore , in dilute sulfuric acid solution into industrial grade cupric sulfate. The said process is characterized by low reaction temp. fast reaction, complete mother liq. recirculation, high utilization ratio of raw materials, short process, less equipment investment, ease of operation, low energy consumption and no environmental pollution.

Method for producing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials

The invention provides a method for preparing calcium carbonate by using calcium carbide slag and low concentration carbon dioxide-containing waste gas as raw materials, which comprises: calcining, digesting and refining calcium carbide slag to obtain calcium hydroxide suspension; and performing the carbonation of the calcium hydroxide suspension and a flue gas or kiln gas, which is purified by desulfuration, dedusting and the like and contains 5 to 15 volume percent of carbon dioxide, under a pressurized condition in a carbonizer to produce light calcium carbonate or nano calcium carbonate. In the invention, a technique for producing calcium carbonate series products by suing calcium carbide slag as raw materials is combined with a technique for recovering carbon dioxide from gas in a coal-burning flue, so the low concentration carbon dioxide in the flue gas is captured, solidified, sealed and stored while the high-added value calcium carbonate products; and thus, the treatment of waste ...

High purity magnesium hydrate preparation method

The invention relates to a method for preparing high-purity magnesium hydroxide. Magnesium chloride and lime milk are taken as raw materials, and the process flow is reasonably arranged according to the difference in solubility of reactants and products in water, thus metathetical reaction is fully carried out. Refining reaction is carried out under the action of an extra physical field to remove a little calcium hydroxide from the magnesium hydroxide and realize the high-efficiency separation of calcium and magnesium, thus the high-purity magnesium hydroxide product is obtained. The content of the magnesium hydroxide in the product is more than 98.5%, the content of calcium oxide is less than 0.2%, and the utilization rate of the magnesium is up to 95%. Compared with sodium hydroxide method, the method has lower cost; compared with ammonia process, the method has higher magnesium conversion rate, no ammoniacal nitrogen wastewater discharge and no air pollution; compared with conventional ...

Process for removing calcium from magnesite

The invention relates to a process for removing calcium from magnesite. The process is characterized by finally reducing the content of calcium oxide below 1.5% through magnesite calcination, slaking, calcium removal, filtration, washing, drying and other treatment procedures. The process has the following beneficial effects: the magnesium hydroxide product which is obtained after removing calcium and has content of calcium oxide being lower than 1.5% can be directly applied to the fields such as flame retardants, oil additives, water treatment neutralizers and the like; other high value-added magnesium-containing materials such as industrial magnesium oxide, electrician magnesium oxide, fused magnesium oxide, light magnesium carbonate and the like can be further processed and produced; and compared with the existing processes for removing calcium from magnesite, the process has the advantages of short flow, low cost, flexible product scheme, thorough calcium removal and the like.

Preparation method of styliform nano calcium carbonate

The invention relates to a preparation method of an acicular nanometer calcium carbonate which does not use a refrigerator, mixes a certain quantity of quick lime with hot water in the proportion of 1:4-10 under the condition of higher temperature and higher concentration of the lime white which are filtered and removed the residue. Before carbonizing, the solution is adjusted to the needed concentration and the temperature, then is added with the crystal-directing agents, then is evenly stirred and then is placed into a carbonation reactor, reacting with the mixed air pumped containing CO2 15-40 percent is pumped. The reaction is stopped when the pH equals to 6.5-7. The reaction solution is prepared to obtain acicular nanometer calcium carbonate by dewatering, cleaning, drying, surface processing, grinding and sieving. The invention has the advantages of realizing an industrial production by adopting the industry bubbling shaped carbonization device as well as utilizing the crystal-directing ...

Dolomite wet process comprehensive utilization technique

The invention discloses a process of wet comprehensive utilization of dolomite, more specifically relates to a process for wet treatment of the dolomite to produce calcium and magnesium products, namely, the dolomite or incinerated dolomite powder is directly leached with sulfate acid to separate the calcium and the magnesium in the dolomite. The calcium precipitates in the form of calcium sulfateand the magnesium enters a solution in the form of magnesium sulfate; then magnesium hydroxide and calcium sulfate products are prepared from the magnesium solution after metathetical reaction and neutralization reaction. The intermediate product, calcium chloride, of the invention can be recycled, so the process is basically free of three-waste discharge and has notable environmental benefit; the invention, besides, significantly lowers the resource consumption and has obvious economic benefit.