495results about "Magnesium chlorides" patented technology

The invention discloses a process for preparing high purity magnesium oxide products, which consists of using brine containing magnesium chloride from sea, lakes or crude magnesium chloride hexahydrate as raw material, purifying the brine through vacuum crystallization method, removing boron, sulfate radicals, calcium ions and soluble impurity substance in the raw material, finally carrying out dynamic calcinations.

A process for the removal of pollutants from a combustion process and, more particularly, a process for removing pollutants such as carbon dioxide, mercury, sulphur dioxide, nitrogen compounds and oxygen compounds from a combustion process. The process includes the removal of pollutants from a combustion process that produces an emission comprising: cooling the emission to a temperature of about 200° C.; removing nitrogen, water and oxygen from the emission to produce a gas containing a concentration of pollutants; contacting the gas with an aqueous magnesium chloride solution, wherein a slurry mixture is formed; and cooling the gas and the slurry mixture, wherein hydrochloric acid vapour and a sludge are formed.

Acidic viscoelastic cleaning compositions are disclosed which use non polymer thickening agents. According to the invention, cleaning compositions have been developed using viscoelastic surfactants in acidic cleaning formulations. These provide the dual benefit of thickening as well as an additional cleaning, thereby improving performance. Applicants have also identified several pseudo linking agents which when, used with viscoelastic surfactants provide enhanced viscoelasticity and cleaning.

The present method describes the absorbing and desorbing of a gaseous reactant on a solid reactant. The solid reactant is an ammonia salt selected from the group consisting of alkali ammonium salts, alkali ammonium earth salts or a combination thereof.

Disclosed herein is a method for economically manufacturing high quality TiC powder, TiCN powder or ultrafine nanophase TiC+Ni (Co, Al) and TiCN+Ni (Co, Al) composite powders by means of metallothermic reduction. The method comprises the steps of preparing a starting solution of titanium tetrachloride (TiCl₄) in a carbon chloride, feeding the starting solution into a closed container containing molten magnesium (Mg) under inert atmosphere, vacuum-separating unreacted liquid-phase Mg and magnesium chloride (MgCl₂) remaining after reduction of magnesium from the closed container, and collecting a TiC compound from the closed container. TiC powder, TiCN powder or ultrafine nanophase TiC+Ni (Co, Al) and TiCN+Ni (Co, Al) composite powders having a particle size of a few tens nm can be manufactured in a simpler manner using economically advantageous starting materials such as titanium tetrachloride and carbon chlorides.

The invention discloses a method for mining and machining a water-soluble potassium salt mine. The method disclosed by the invention comprises the following steps: firstly, exploiting the potassium salt mine by adopting a well drilling water soluble method; evaporating and crystallizing the exploited brine to sequentially precipitate a sodium salt and a potassium salt; refrigerating and crystallizing the residual feed liquid to further precipitate potassium chloride; and respectively filtering and drying the precipitated sodium salt and potassium salt to obtain finished sodium salt and potassium salt, wherein a part of mother liquor after the sodium salt and potassium salt are precipitated is used for preparing magnesium chloride, and the other part is used for preparing magnesium oxide. The method disclosed by the invention is particularly suitable for the exploitation of a potassium mine having the defects of complicated geological and hydrologic conditions, over-shallow or over-deep burial, poor quality and high carnallite content, can reduce ground collapse, improves the exploitation rate, can prepare a potassium fertilizer in a large scale and has the advantages of low energy consumption and little pollution and waste discharge.

The invention pertains to the technical field of inorganic salt chemical industry, and in particular relates to a method for removing boron and iron from a saturated boron-bearing magnesium chloride solution. The method is a coordinate process integrating acidification and extraction which aims at solving the deficiency of the present process for removing boron and iron from the saturated boron-bearing magnesium chloride solution in salt lakes, and the technological process includes an acidification and boron extraction section, a filtration section, an extraction section and a reverse extraction section. The saturated boron-bearing magnesium chloride solution is taken as the raw material in the method, to which hydrochloric acid or sulfuric acid is added to acidify and precipitate boric acid, the remnant boric acid in the acidizing solution is extracted and removed by a mixed alcohol, the contents of B2O3 and Fe2O3 can be reduced to be less than 25mg/l, and the recovery ratio of boric acid reaches more than 99%; owing to the adoption of the mixed alcohol extraction technology, the method not only solves the problem of great extractant loss in the extraction method effectively, but also removes iron from the saturated magnesium chloride solution, and has the advantages of short technological process, simple operation and high yield.

The invention discloses a combination production method for industrially producing a plurality of products by using high-iron alumyte as a material. The combination production method comprises the steps of performing pressure-leaching the high-iron alumyte by using hydrochloric acid as a leaching medium, iron enters the hydrochloric acid in the form of ion to form the chloride of iron, aluminum is left in solid alumyte, thereby separating iron from aluminum; roasting a hydrochloric acid leaching fluid to obtain iron oxide red and a chlorine hydride gas, wherein the chloride hydride gas is absorbed by washing water and becomes hydrochloric acid, which can be recycled; and melting the upper layer of products, conducting directional crystallization to prepare a cocrystallized Al-Si alloy with silica content below 14wt%. Therefore, the high-iron alumyte which cannot be utilized currently, can be comprehensively utilized.

The invention discloses a seawater desalination, resource comprehensive utilization and zero discharge processing system. The system comprises an ultrafiltration (UF) system, a seawater reverse osmosis (SWRO) system, a deionized water processing system, namely an UPW system, a mechanical compression system capable of preventing scaling and a salt manufacturing and salt chemical engineering system, wherein the UF system is used for generating pure seawater; the SWRO system is used for generating desalted water and concentrated seawater; the concentrated seawater can be produced into calcium sulfate, sodium chloride, potassium chloride, magnesium sulfate, bromine, magnesium chloride and steam condensed water by virtue of the mechanical compression system and the salt manufacturing and salt chemical engineering system; and the steam condensed water and a part of desalted water flow into the UPW system to generate deionized water. According to the processing system, the relevant projects of seawater desalination, energy source utilization, industrial salt manufacturing and salt chemical engineering are organically combined, so that reasonable allocation and utilization of resources are realized, and the aims of energy conservation, emission reduction, circular economy and zero discharge are fulfilled.

The method for preparing anhydrous magnesium chloride includes the following steps: 1. preparation of organic hydrated magnesium chloride; 2. reaction, crystallization and coupling reaction to prepare anhydrous magnesium chloride complex; 3. solid-liquid separation and washing; 4. crystallizing mother liquor and circular utilization of precipitant; and 5. heat treatment of complex intermediate product to obtain the anhydrous magnesium chloride. Said invention adopts mixed organic solvent to prepare hydrated magnesium chloride solution, can reduce production of alkoxide in the course of crystallization, and can return the washing liquor containing saturated hexamine magnesium chloride into crystallization reaction procedure, and can raise rate of deposition of magnesium chloride and utilization rate of ammonia, and can reduce the running load of recovery tower. Said invention also adopts the reaction cold-crystallization process, and is favorable for implementing industrial production.

A method for efficiently extracting minerals of high purity from deep ocean water by using low temperature vacuum crystal is disclosed. The method comprises the steps of: obtaining concentrated liquid containing ion components and fresh water without the ion components by freshening the deep ocean water; separating crystals of a calcium salt, a sodium salt, and a sulfate from the concentrated liquid by heat-concentrating and filtering the concentrated liquid; obtaining a mixed salt slurry of a potassium salt and a magnesium salt by concentrating the concentrated liquid from which a calcium salt, a sodium salt, and a sulfate are removed; obtaining a solution in which a magnesium salt is dissolved and a crystal of a potassium salt by washing the mixed salt slurry with water; and obtaining a mixed crystal of a potassium salt and a magnesium salt by concentrating the solution in which a magnesium salt is dissolved, and then separating a magnesium salt solution with improved purity by filtering the concentrated solution in which a magnesium salt is dissolved.

The invention relates to a method for preparing fibrous alkali magnesium chloride Mg2(OH)3Cl.4H2O single crystal. The single crystal is prepared by the following compounds in weight percentage: 80.53 to 85.13 percent of crystal magnesium chloride, 9.3 to 13.87 percent of calcium chloride, and 5.29 to 5.58 percent of calcium hydroxide. The method for preparing the fibrous alkali magnesium chloride Mg2(OH)3Cl.4H2O single crystal by the compounds comprises the following steps: preparing the magnesium chloride and the calcium chloride into aqueous solution; adding calcium hydroxide powder to the aqueous solution; heating the mixed solution to the temperature of between 50 and 90 DEG C under the condition of continuously stirring, and controlling the pH value of the solution to between 8 and 9; stopping heating the solution and keeping the solution stand after the reacting solution is completely changed into white suspension; placing the suspension in an oven for boiling for 2 to 4 days at a temperature of between 50 and 90 DEG , after the suspension is deposited; and washing and filtering the deposition to obtain the fibrous alkaline magnesium chloride which has the diameter of between 0.2 and 3 microns and the length of between 10 and 100 microns, and has the advantages of high purity, good uniformity of crystal shape and stable composition.

The invention relates to a preparation and comprehensive utilization method of a magnesium bicarbonate solution. The method is used to prepare the magnesium bicarbonate solution used for deposition, crystallization and recovery of rare earth ions, and comprehensive recovery of calcium-compound products and magnesium-compound products by taking dolomite as a raw material. The method specifically comprises: roasting dolomite to obtain a powder containing calcium oxide and magnesium oxide, directly mixing with a magnesium chloride solution for digestion and alkali transformation at the same time to prepare a magnesium hydroxide secondary-product and a calcium compound secondary-product, and further to realize effective separation of calcium and magnesium; performing slurry mixing on magnesium hydroxide, introducing carbon dioxide gas for a carbonization reaction to prepare the magnesium bicarbonate solution; applying obtained magnesium bicarbonate to deposition and crystallization of the rare earth ions to produce rare-earth carbonate or rare-earth oxide products; and recycling one part of the filtrate to prepare magnesium bicarbonate, and evaporating one part of the filtrate for crystallization to produce the magnesium compound product.

Anhydrous magnesium chloride production by microwave energy is disclosed. It is carried out by dehydrating hexhydrated magnesium chloride to obtain magnesium chloride with 1.5-2.0 water content in the first microwave heater, dehydrating hexhydrated magnesium chloride to obtain tetrahydrated magnesium chloride at temperature 100-120deg.C, dehydrating tetrahydrated magnesium chloride to obtain magnesium chloride with 1.5-2.0 water content at temperature 100-150deg.C, and realizing magnesium chloride with 1.5-2.0 water content to obtain anhydrous magnesium chloride at temperature 150-350deg.C. It achieves low dehydrating temperature and short time.

There are provided processes for preparing alumina. These processes can comprise leaching an aluminum-containing material with HCl so as to obtain a leachate comprising aluminum ions and a solid, and separating said solid from said leachate; reacting said leachate with HCl so as to obtain a liquid and a precipitate comprising said aluminum ions in the form of AlCl₃, and separating said precipitate from said liquid; and heating said precipitate under conditions effective for converting AlCl₃ into Al₂O₃ and optionally recovering gaseous HCl so-produced. These processes can also be used for preparing various other products such as hematite, MgO, silica and oxides of various metals, sulphates and chlorides of various metals, as well as rare earth elements, rare metals and aluminum.

The invention provides a method for preparing gypsum whiskers, magnesium chloride, ammonium magnesium phosphate and ammonium chloride from phosphate tailings. The method comprises the following steps:adding an acidizing fluid into phosphate tailings in batches, dropwise adding hydrochloric acid to react, separating silicon slag and an acidolysis solution, and cooling and crystallizing the acidolysis solution to obtain calcium chlorophosphate and acidolysis solution; adding concentrated sulfuric acid into the acidizing fluid, dropwise adding the acidolysis fluid for reaction, and performing centrifugal separation after reaction to obtain gypsum whiskers and the acidizing fluid; heating and concentrating the acidizing fluid, crystallizing to obtain a magnesium chloride solution, and centrifugally separating the magnesium chloride solution to obtain magnesium chloride hexahydrate and a magnesium chloride mother liquor; adding ammonium sulfate and calcium chlorophosphate into the magnesium chloride mother liquor for reaction, filtering to obtain gypsum and a filtrate after the reaction is finished, dropwise adding ammonia water into the filtrate, cooling and filtering to obtain ammonium magnesium phosphate and an ammonium chloride solution; heating, concentrating, and cooling the ammonium chloride solution to obtain ammonium chloride crystals and a crystallization mother liquor, and after centrifugal separation, preparing a 5 to 20% ammonia water solution from the crystallization mother liquor and ammonia water. According to the technical scheme, the recovery rate of phosphorus reaches 99%, and the recovery rate of calcium reaches 95%.

The invention relates to a method for preparing calcium sulfate whiskers and magnesium hydroxide by decomposing phosphate tailings through hydrochloric acid. The method comprises the following steps: adding phosphate tailings and hydrochloric acid into a decomposing tank to adequately react in the decomposing tank, and carrying out solid-liquid separation I on reacted slurry, so as to separate first mother solution and solid waste residues, wherein the solid waste residues are acid-insoluble substances; adding sulfuric acid into the first mother solution to react for crystallization, so as to generate the calcium sulfate whiskers; carrying out solid-liquid separation on crystallized slurry, so as to separate calcium sulfate dihydrate whiskers, wherein the mother solution is a mixed mother solution containing magnesium chloride and hydrochloric acid; after magnesium chloride in the mixed mother solution reaches a certain concentration, starting to take out a part of mixed mother solution, carrying out flash evaporation to evaporate HCl in the mother solution so as to obtain the mother solution mainly containing magnesium chloride, and returning the rest part of the mixed mother solution to the decomposing tank; introducing ammonia gas into the magnesium chloride mother solution, and carrying out solid-liquid separation, so as to obtain a relatively pure magnesium chloride mother solution and magnesium ammonium chloride solids containing a small amount of impurities; and absorbing HCl gas in the front stage by a magnesium ammonium chloride solution to enable the pH value of the magnesium ammonium chloride solution to be close to neutrality, and carrying out concentration and crystallization, so as to obtain magnesium ammonium chloride crystals. The method has the advantage that magnesium hydroxide and the calcium sulfate whiskers which have relatively high quality can be produced from industrial waste and the cheap raw materials.

The invention provides a reprocessing method of phosphate ore flotation tailings and a phosphate ore flotation method. The reprocessing method comprises the following steps that firstly, acidolysis onthe phosphate ore flotation tailings is conducted, then floating coupling, precipitation and filtering are conducted for several times to separate silicon, phosphorus, Ca<2+> and Mg<2+> in the phosphate ore flotation tailings in the form of silicon slag, calcium chloride calcium phosphate, gypsum whisker and MgCl2.6H2O from each other. According to the reprocessing method, separated outcomes canbe used for producing industrial products, no waste residue is generated in the whole process, reutilization of the phosphate ore flotation tailings is realized, the resource utilization rate of the phosphate ore flotation tailings is improved, therefore the problems that the phosphorus tailings occupy land resources and pollute environment are solved, and the method has good economic benefits andimportant environmental protection significance.

The invention provides a method for removing trace impurities in magnesium chloride by using waste brine discharged in potassium chloride production as a raw material by an improved two-stage recrystallization technique. Each stage of the crystallization technique comprises the following steps: 1) free settling, 2) natural evaporation and crystallization, 3) size-grading selective recycling, 4) filtration, (5) saturated magnesium chloride solution washing and the like. By using the method, trace impurities, such as boron, sulfur, ferrum and the like, in magnesium chloride can be reduced to less than 5 ppm, and the purity of the product magnesium chloride hexahydrate is higher than 99.5%. The invention has the characteristics of low energy consumption and low cost, is simple to operate, and is applicable to refining magnesium metal, flame retardant, magnesium hydroxide or any other raw material by an electrolytic process.

The invention discloses a pyrite cinder separation, recovery and recycling method and belongs to the technical field of an inorganic chemistry industry. The method comprises carrying out suspended separation on calcium hydroxide and alumina through water, dissolving and separating alumina through an ammonium salt, dissolving iron sesquioxide/ferrous oxide in the pyrite cinder through strong phosphoric acid, filtering to separate the mixture of sulfur, phosphorus and silica insoluble with strong phosphoric acid from iron sesquioxide/ferrous oxide, and separating and recovering resource materials such as iron sesquioxide/ferrous oxide and alumina or aluminum hydroxide. The separated product can be used for an industrial raw material and agricultural fertilizer.

A process for formulating high purity potassium chloride from a carnallite source. The process takes advantage of solubility differences and saturation levels in a multiple salt system generated upon dissolution of carnallite. In the system, the sodium chloride is kept in solution and the magnesium chloride present in the system is controlled to be in a concentration range of between 12% and 25% by weight. This avoids co-precipitation of sodium chloride with the potassium chloride during crystallization and therefore prevents the sodium chloride from contaminating the potassium chloride. The result is high grade potassium chloride.

The preparation process of low-sodium carnallite features that the subtype magnesium sulfate bittern as material is prepared into low-sodium carnallite through natural evaporation in saltern to separate out solid salt and to obtain bittern with Mg ion content not less than 7.0 %, subsequent blending with mixed potassium salt in the weight ratio of 1-3 to produce crystallization reaction, and filtering. The present invention has simple process and convenient operation, and the low-sodium carnallite product produced directly from bittern has sodium chloride content of 1.35 %, purity up to 98 % and no floatation chemical contained. The blending process has single time potassium ion recovering rate up to 66.50 %. The said technological process has no environmental pollution.