161results about "Magnesium chlorides" patented technology

The invention discloses a preparation method of basic magnesium chloride, which comprises the following steps: dissolving magnesium chloride in water, heating to 50-95 DEG C, and stirring for 1-2 hours to obtain a colorless and transparent first solution; magnesium oxide is added into the first solution, alkali is added to adjust the pH to be 8-10, heat preservation is conducted, stirring continues for 1-4 h, and a second solution is obtained; pulping the second solution into a crystallization kettle, crystallizing, centrifuging, washing, drying a filter cake at 80-105 DEG C to obtain a white product basic magnesium chloride, and circulating mother liquor water for the synthesis reaction. The synthesis process provided by the invention is simple, high in product yield and yield and suitable for mass production, a common chemical synthesis kettle can meet production requirements, high-temperature and high-pressure procedures are avoided, and the production cost is reduced. The method is low in energy consumption, high in safety, free of wastewater and sewage discharge, green and environment-friendly.

The invention provides anhydrous magnesium chloride and a preparation method thereof, and the preparation method comprises the following steps: mixing MgCl2. NH2O and ammonium chloride, carrying out ball milling, tabletting and granulating the mixed material, and heating and sintering the obtained flaky particles to obtain the anhydrous magnesium chloride, wherein n is an integer, and 0 < n < = 6. The water-containing magnesium chloride and the ammonium chloride can form an alternately coated sandwich structure through the pretreatment modes of ball milling and tabletting granulation, so that hydrogen chloride gas and ammonia gas generated during heating decomposition are diffused from the inside of the flaky particles to the outside, and meanwhile, the water-containing magnesium chloride in the particles can be fully exposed in a hydrogen chloride atmosphere; mgO generated in the sintering process is reduced; according to the tabletting and granulating method, large pores can exist among the flaky particles, generated water molecules can be taken away from a heating system from the pores existing among the flaky particles along with gas circulation in the heating and sintering process, and dehydration is better achieved. Meanwhile, the method is more beneficial to model selection of dehydration equipment.

The invention discloses a method for preventing ammonium chloride from sublimating and escaping in the roasting process, and belongs to the field of chemical metallurgy. The method comprises the following steps: uniformly mixing the alkaline chemical metallurgical material and ammonium chloride, grinding, and carrying out compression molding to obtain compact ore balls or ore grains, and roasting the compact ore balls or ore grains. In the heating and roasting process of the dense ore balls or the ore grains, HCl generated by thermal decomposition of ammonium chloride cannot escape, so that the HCl reacts with alkaline substances in the alkaline chemical metallurgical materials to be converted into chloride, the chloride absorbs ammonia and is converted into ammonochloride, and the ammonochloride on the surface layer of the dense ore balls or the ore grains is thermally decomposed to release NH3; the method has the advantages of being economical, efficient, clean, environmentally friendly and the like, and is suitable for large-scale industrial production of roasting of the alkaline chemical metallurgical material ammonium chloride.

The present invention relates to a high-salt wastewater resource utilization technology, particularly to the resource utilization of potassium nitrate mother liquor, and specifically to a method for recycling potassium resources in the potassium nitrate mother liquor. The method comprises brine adjustment, first-stage cooling, second-stage cooling, solid-liquid separation, decomposition and washing, and evaporation and concentration. A decomposition liquid produced by the decomposition and washing is mixed with a concentrated liquid produced by evaporation and concentration to adjust the MgCl2 content in the system. The brine-adjusted system is cooled in two stages, followed by solid-liquid separation to obtain a crystalline solid and a crystalline mother liquor. The crystalline solid is added to the potassium nitrate mother liquor and stirred thoroughly, followed by solid-liquid separation to obtain potassium chloride solid and a decomposition liquid. The potassium chloride solid is reused as a production raw material. The crystalline mother liquor is evaporated and concentrated, and a portion of the concentrated liquid and the decomposition liquid are recycled by mixing brine. The remaining concentrated liquid is cooled to room temperature to obtain MgCl2·6H2O solid. The present invention recycles potassium chloride in the by-product mother liquor without adding additional steam and water.

The invention discloses a fused salt purification method and a fused salt purification device.The fused salt purification method comprises the following steps that S1, in an oxygen-free and water-free operation environment, fused salt is put into a reaction container, firstly, the fused salt is heated to a first preset temperature and kept for a first preset duration, and then the fused salt is heated to a second preset temperature and kept for a second preset duration; s2, mixed gas of HCl and H2 is introduced into the reaction container heated to the second preset temperature, HCl is cut off after a period of time, then H2 is used for bubbling for a period of time, inert gas is introduced for bubbling, residual HCl and H2 in the molten salt are removed, and purified molten salt is obtained. The molten salt purification device comprises a gas supply system, a reaction container and a storage container, the device can treat kilogram-level chlorine salt in batches, and the molten salt purification efficiency is high.

The utility model relates to a device for recovering magnesium salt tablets from industrial magnesium salt-containing wastewater, which is characterized in that magnesium salt in industrial waste acid is recovered by adopting an evaporation mode, after the magnesium salt-containing wastewater is filtered and precipitated, a supernatant solution enters an evaporation system to be evaporated and concentrated, a concentrated solution is recovered, cooling and flaking are carried out, and flaked magnesium salt is collected. The evaporation system comprises an evaporator and a condenser. The evaporation system increases the evaporation speed by enhancing evaporation; through the characteristic of normal-pressure evaporation, the problems that the boiling point is increased due to the fact that the solubility of the solution is increased, and energy consumption is increased due to the fact that the requirement for the quality of a heat source is improved in a traditional boiling evaporation process link and the evaporation system works unstably are solved. Compared with the prior art, the energy utilization efficiency is improved, the energy consumption is reduced, the operation stability of the system is improved, and the risk that the evaporator is scaled and blocked is avoided.

The invention discloses a comprehensive utilization method of refining slag, which comprises the following steps: dissolving the refining slag in hydrochloric acid to obtain a refining slag pickle liquor; filtering the refining slag pickle liquor to obtain first filtrate and filter residues, and washing the filter residues to obtain first solid and first washing liquor; combining the first washing liquid and the first filtrate to obtain a second mixed solution; and adding an oxidizing agent into the second mixed solution to obtain a first precipitate. According to the method, the refining slag is subjected to acid leaching with hydrochloric acid, the PH value of the solution is adjusted, silicon dioxide, aluminum hydroxide, ferric hydroxide, calcium chloride or calcium oxide and recycled hydrochloric acid are obtained, the accumulated refining slag is decomposed into various new substances in the process reaction, the method is simple, the substance purity is high, the refining slag is recycled, and large economic value can be created; and meanwhile, mining of various resources is reduced. And a new direction is found for comprehensive utilization of the refining slag.

The invention relates to the technical field of extraction of lithium, potassium and boron in salt lakes, and discloses a method for co-producing lithium, potassium and boron by gradient utilization of original brine in salt lakes. The method comprises the following steps: S1, extracting lithium from original salt lake brine to obtain qualified lithium liquid and lithium extraction tail liquid; s2, preparing a battery-grade lithium product by using the qualified lithium liquid; s3, the lithium extraction tail liquid is subjected to beach drying through a salt pan, and potassium-containing solid salt (potassium mixed salt and carnallite), liquid old brine and bischofite are obtained; s4, preparing a potassium chloride product from the potassium-containing solid salt and bischofite; and S5, preparing a boric acid product by using the old brine. According to the method, a lithium extraction pre-treatment and salt lake brine potassium, boron and lithium process technical route is converted into a lithium, potassium and boron process route, the production cycle of a lithium salt product is shortened to 2 months from original 2-3 years, the lithium yield is increased by about one time, and meanwhile, the lithium-potassium-boron process is adopted, so that the problem that lithium extraction films and equipment are corroded and influenced by boron extraction acidification is solved, and the method is suitable for industrial production. Comprehensive development and utilization of salt lake resources are realized.

The invention relates to the technical field of tailing preparation, and provides a device and method for preparing magnesium chloride from serpentine tailings, the device for preparing magnesium chloride from serpentine tailings comprises a fixed support, the top of the fixed support is fixedly connected with a semi-cylindrical support, and a magnetic separation barrel is rotationally arranged in the semi-cylindrical support through a rotating seat; the device further comprises a circulation frame, the circulation frame is fixedly connected to one side of the top of the semi-cylindrical support, two treatment cavities are formed in the circulation frame, a mineral powder input assembly and a residue output assembly are arranged in the two treatment cavities correspondingly, and a powder liquid discharging assembly is arranged on the other side of the top of the semi-cylindrical support. And the powder liquid discharge assembly is communicated with the mineral powder input assembly. According to the technical scheme, the problem that in the magnetic separation process of the serpentine tailing powder in the prior art, it is difficult to sample, test and detect part of the serpentine tailings in the magnetic separation process of the serpentine tailings continuously is solved.

Embodiments of the present disclosure are directed to systems and methods of removing carbon dioxide from a gaseous stream using magnesium hydroxide and then regenerating the magnesium hydroxide. In some embodiments, the systems and methods can further comprise using the waste heat from one or more gas streams to provide some or all of the heat needed to drive the reactions. In some embodiments, magnesium chloride is primarily in the form of magnesium chloride dihydrate and is fed to a decomposition reactor to generate magnesium hydroxychloride, which is in turn fed to a second decomposition reactor to generate magnesium hydroxide.

The utility model belongs to the technical field of chemical equipment, and discloses an iron and boron removal device in magnesium chloride production, which comprises a dissolving kettle, an impurity removal kettle, a heat preservation sedimentation kettle, a first filtering device, an acid adjusting kettle, an iron and boron removal kettle, a second filtering device, a concentration kettle, a crystallization kettle, a centrifugal machine, a drying machine and a packaging machine which are sequentially communicated through pipelines, adjusting valves and pumps, the dissolving kettle is provided with a magnesium chloride crude product feeding hole and a water feeding hole; a liquid material outlet of the first filtering device is communicated to a feeding hole of the acid adjusting kettle, the iron and boron removing kettle is provided with a hydrogen peroxide feeding hole and a ferric hydroxide feeding hole, and a liquid material outlet of the second filtering device is communicated to a feeding hole of the concentration kettle; and a liquid material outlet of the centrifugal machine is communicated with a water feeding hole of the dissolving kettle through a pipeline. According to the device, iron and boron elements in the magnesium chloride crude product are removed, the treatment effect is good, the purity of the obtained product is high, and the application range is wide.

The invention belongs to the technical field of anhydrous magnesium chloride production, and particularly relates to a preparation process of anhydrous magnesium chloride, which comprises the following steps: firstly, dissolving magnesium chloride hexahydrate in absolute ethyl alcohol to form a magnesium chloride ethanol aqueous solution, and then dehydrating the magnesium chloride ethanol aqueous solution by using a molecular sieve to obtain the magnesium chloride ethanol solution; carrying out secondary cooling, stirring crystallization, secondary solid-liquid separation and vacuum drying on the magnesium chloride ethanol solution to obtain high-purity anhydrous magnesium chloride; and recycling ethanol liquid obtained by solid-liquid separation and ethanol gas obtained by vacuum drying. The technical scheme provided by the invention is simple in process flow, low in energy consumption, low in equipment requirement, high in product yield and high in purity, and can be directly applied to the fields of electrolytic preparation of magnesium, catalyst carriers and the like.

It is provided a process for extracting nickel sulfate from mining ores, such as serpentine, comprising the steps of conducting a magnetic separation of the mining ores producing a magnetic fraction and a non magnetic fraction; leaching the non magnetic fraction with HCI producing a slurry comprising metals chloride; filtrating the slurry producing a metals chloride liquor; purifying the metals chloride liquor producing a magnesium chloride solution; separating an iron-nickel cake from the magnesium chloride solution; leaching the cake together with the magnetic fraction producing a metallic sulfate solution; extracting nickel and cobalt from the metallic sulfate solution by a ion exchange resin extraction and stripping producing an inorganic stripped phase; submitting the inorganic stripped phase to a liquid-liquid extraction producing a nickel concentrated phase; and evaporating and drying the nickel concentrated phase to recuperate nickel sulfate.

A process for removing lactic acid from an aqueous lactic acid-containing magnesium chloride solution, the weight ratio of magnesium chloride to lactic acid in the aqueous lactic acid-containing magnesium chloride solution being at least 1:1, the process including the steps of subjecting the aqueous lactic acid-containing magnesium chloride solution to an evaporation step, resulting in the formation of a slurry of MgCl2·MgL2·4H2O in an aqueous magnesium chloride solution, then subjecting the slurry to a solid-liquid separation step, to separate the solid MgCl2·MgL2·4H2O from the aqueous magnesium chloride solution, resulting in the removal of lactic acid from the aqueous lactic acid-containing magnesium chloride solution in the form of MgCl2·MgL2·4H2O. The process makes it possible to efficiently remove lactic acid from aqueous lactic acid-containing magnesium chloride solutions, resulting in magnesium chloride solutions with a low lactic acid content which can be further processed as desired.

A method of treating a brine composition includes hydrolyzing a metal halide salt in the brine composition to form a hydrolysis product including a hydrohalic acid. The metal includes an alkaline earth metal or an alkali metal.

The invention discloses a low-temperature dehydration method of hydrous magnesium chloride and anhydrous magnesium chloride, comprising the following steps: contacting hydrous magnesium chloride with ammonium chloride to obtain a mixed dehydrated raw material; and heating the mixed dehydrated raw material, and keeping the temperature for a certain time after the mixed dehydrated raw material reaches a set temperature until water in the water-containing magnesium chloride is removed. The invention also provides the anhydrous magnesium chloride prepared by the method. According to the method, synthesis of carnallite is not needed, hydrogen chloride protective gas is not needed, dehydration can be achieved through independent ammonium chloride, equipment is hardly corroded, the operation environment is good, and anhydrous magnesium chloride is prepared under the mild condition.

This invention provides a production process for manufacturing metallic magnesium and industrial silicon by decomposing serpentine using the hydrochloric acid method. [Solution] The present invention provides a method for processing serpentine ore as a raw material using a two-stage countercurrent hydrochloric acid leaching process. The wet process steps include storage and filtration of the slurry after ore dressing, two-stage hydrochloric acid leaching under atmospheric pressure, washing and filtration of the silicon slag after leaching, removal of iron and nickel precipitation from the leaching solution, separation, washing and filtration of the obtained iron hydroxide and nickel hydroxide, crystallization and evaporation of the magnesium chloride solution, and production of hydrochloric acid using the gas generated after the thermal decomposition of magnesium chloride. The present invention has developed a serpentine decomposition technology using hydrochloric acid, a metallic magnesium production process using a drying-electrolytic method, and a process for producing industrial silicon by smelting silicon slag in an electric furnace.

The utility model discloses a crystallization device for magnesium chloride production, and relates to the technical field of magnesium chloride production devices, an outlet of a magnesium chloride solution tank is communicated with a first evaporation tank, an outlet of the first evaporation tank is communicated with a settling tank, and a solid phase outlet of the settling tank is communicated with a first crude product tank; a liquid phase outlet of the settling tank is communicated with a clear liquid tank, an outlet of the clear liquid tank is communicated with a second evaporation tank, and an outlet of the second evaporation tank is communicated with a second crude product tank; outlets of the first crude product tank and the second crude product tank are respectively communicated with a crystallizing tank, and an outlet of the crystallizing tank is communicated with a magnesium chloride finished product tank. The magnesium chloride solution is concentrated twice and then recrystallized, so that the obtained magnesium chloride product is higher in purity and lower in water content, and the quality of the product is improved. In addition, through multiple purification, the yield of the magnesium chloride product is improved, the waste of raw materials is reduced, and the whole process is less in hazardous waste and environment-friendly.

Methods for immobilizing carbon dioxide and producing stabilized amorphous alkaline earth metal carbonates are provided.

The invention belongs to the technical field of inorganic salt preparation, and discloses a method for preparing anhydrous magnesium chloride by dehydrating magnesium chloride hexahydrate, which comprises the following steps: by taking magnesium chloride hexahydrate as a raw material, carrying out preliminary dehydration to obtain low-water magnesium chloride, mixing the low-water magnesium chloride with fluid ammonia to carry out solid-liquid reaction, then carrying out solid-liquid separation and reduced pressure treatment to obtain a solid phase, and further performing high-temperature deamination to obtain anhydrous magnesium chloride. According to the method disclosed by the invention, solid-liquid reaction is directly carried out on the fluid ammonia and the low-water magnesium chloride, so that the use of a large amount of organic solvents and complicated operation steps in a traditional ammonia-gas-based alcohol ammonia method are avoided. Compared with a gas-solid reaction, the solid-liquid reaction has the advantages of being high in reaction speed, high in yield and the like, separation of ammonia and water can be achieved only through decompression treatment, and therefore recycling of ammonia is easy to achieve. Meanwhile, the method avoids corrosion of acid gas to equipment in a gas protection heating method taking hydrogen chloride as protective gas, and large-scale and rapid dehydration of magnesium chloride hexahydrate can be realized.

Processes and devices for reducing impurities in halogen salts, where the halogen salt is brought into contact with an active metal. The halogen salts purified in this way are suitable for use as high-temperature storage materials in thermal power plants and for industrial process heat, or as electrolytes in batteries.

The invention relates to the technical field of chemical engineering, and provides a calcium chloride and magnesium chloride production device and a production method for preparing calcium chloride and magnesium chloride from dolomite, and the production device comprises a pretreatment assembly, a first-stage reaction kettle and a second-stage reaction kettle which are connected in sequence. The second-stage reaction kettle comprises a tank body, a first outlet formed in the upper part of the tank body and a second outlet formed in the bottom of the tank body. The first outlet is sequentially connected with a water washing tower, a drying device and an evaporation condenser. The second outlet is sequentially connected with a reduced-pressure evaporator, a low-temperature crystallizer, a horizontal centrifuge, a purification tank and a normal-pressure evaporator. The pretreatment assembly, the first-stage reaction kettle and the second-stage reaction kettle are sequentially arranged, so that gradient control over the reaction process is achieved, it is ensured that the acidolysis reaction is more thorough, the chemical purity of calcium chloride and magnesium chloride is improved, precise separation of gaseous impurities and liquid impurities is ensured, and the purification rate of a final product is further increased.

The invention discloses a method for purifying carnallite, purified carnallite and application of the purified carnallite. The method comprises the following steps: uniformly mixing sodium-containing carnallite, old brine and water to form a mixed system, wherein the mass ratio of the sodium-containing carnallite to the old brine to the water in the mixed system is 1: (3.56-6.15): (0-0.28); heating the mixed system to completely dissolve potassium in the sodium-containing carnallite in a liquid phase to obtain a mixed solution; carrying out solid-liquid separation on the mixed solution to obtain a carnallite saturated solution; and adding water into the carnallite saturated solution to separate out crystals, thereby obtaining the purified carnallite. According to the method provided by the invention, the carnallite is dissolved by using the old brine under a high-temperature condition to obtain a carnallite saturated liquid phase, and the carnallite can be separated out by cooling and crystallizing, so that the content of sodium chloride in the carnallite can be effectively reduced.

The present invention discloses a magnesium chloride granulation and drying integrated system and method, including a granulation and drying integrated machine and a magnesium chloride spray device, the granulation and drying integrated machine includes a granulation zone and a fluidized section connected, the granulation zone is located above the fluidized section, a discharge port is arranged at one end of the fluidized section, the granulation zone is connected to the magnesium chloride spray device, the discharge port and the magnesium chloride spray device are located on the same side of the granulation and drying integrated machine, a cooling air chamber and a drying air chamber are arranged below the granulation and drying integrated machine, the cooling air chamber outlet is connected to the granulation zone, and the drying air chamber outlet is connected to the fluidized section, wherein the cooling air chamber outlet is located at one end away from the magnesium chloride spray device, and the drying air chamber outlet is located at one end close to the discharge port. The spray granulation of magnesium chloride brine and the drying process of magnesium chloride particles are integrated in one device, the device has a high degree of integration, reduces the number of equipment, material transfer links and equipment failure points, and improves production efficiency.

The application discloses a method for preventing ammonium chloride from sublimating and escaping in a roasting process, and belongs to the field of chemical metallurgy. Alkaline chemical metallurgical materials and ammonium chloride are sequentially subjected to mixing, grinding and compression molding to obtain dense ore agglomerates or ore grains, and the dense ore agglomerates or ore grains are subjected to roasting. In the heating and roasting process, the HCl generated by the thermal decomposition of the ammonium chloride cannot escape, which promotes the reaction of the HCl with alkaline substances in the alkaline chemical metallurgical materials to convert into chlorides, the chlorides are converted into ammine chlorides by absorbing ammonia, and the ammine chlorides on the surface layer of the dense ore agglomerates or ore grains are decomposed by heat to release NH3, so that the probability of the ammonium chloride from sublimating and escaping in the roasting process is greatly reduced. The method has the advantages of high economic efficiency, clean and environmental protection and the like, and is suitable for large-scale industrial production of the roasting of the ammonium chloride in the alkaline chemical metallurgical materials.

The invention discloses an anhydrous magnesium chloride preparation system and process. The system comprises a first fluidized bed dryer, a second fluidized bed dryer and a cooling bin, a material outlet of the first fluidized bed dryer is connected with a material inlet of the second fluidized bed dryer; a material outlet of the second fluidized bed dryer is connected with a material inlet of the cooling bin; waste gas outlets of the first fluidized bed dryer and the second fluidized bed dryer are respectively connected with a first tail gas treatment device and a second tail gas treatment device; a purified gas outlet of the second tail gas treatment device is connected with a gas inlet of the second fluidized bed dryer; the device solves the problem of equipment shutdown caused by material melting, air distribution plate blocking and bed blocking, is good in stability, can operate for a long period, and is suitable for large-scale production; meanwhile, the fluidized bed dryers are good in matching performance and large in adjustable range, and the problems that technological parameters of the fluidized bed dryers are large in fluctuation, and long-period operation cannot be achieved are solved.

The present disclosure provides a method for extracting potassium bicarbonate from a mineral mixture. The method includes combining potassium chloride, sodium bicarbonate, and magnesium carbonate trihydrate in an aqueous solution. The aqueous solution is cooled to form Engel's salt comprising potassium bicarbonate magnesium carbonate tetrahydrate. Engel's salt is separated from the aqueous solution and leached with water to produce an aqueous potassium bicarbonate solution and magnesium carbonate trihydrate. The method may further include recycling at least a portion of the magnesium carbonate trihydrate produced from leaching Engel's salt back into the aqueous solution. The aqueous potassium bicarbonate solution can be processed to produce various potassium bicarbonate products.

To provide a method for producing an anhydrous metal chloride that minimizes the emission of carbon dioxide gas into the atmosphere.SOLUTION: A method for producing an anhydrous metal chloride includes a chlorination step for heating metal oxide in a mixed gas of carbon monoxide gas and chlorine gas at a temperature of 300°C or higher and 1200°C or lower, to produce anhydrous metal chloride; and a gas reduction step for reducing the emission of carbon dioxide gas in the chlorination step, to produce carbon monoxide gas. The carbon monoxide gas produced in the gas reduction step is used in the chlorination step.SELECTED DRAWING: Figure 1

The present disclosure relates to a process of extracting magnesium or magnesium compounds from a ferronickel slag feed comprising magnesium and silica compounds, the process comprising: a comminution step to reduce a particle size distribution of the ferronickel slag feed; and an acid leaching step after the comminution step, comprising: leaching the ferronickel slag feed from the comminution step in a vessel with hydrochloric acid at a concentration of 5-15 wt.% HCl to form a leached slurry, controlling the hydrochloric acid concentration during leaching by adding further hydrochloric acid to the vessel to maintain the hydrochloric acid concentration at 5-15 wt.% HCl, and obtaining a leached slurry from the vessel, wherein the leached slurry comprises a liquid portion and a solids residue, and wherein the liquid portion comprises magnesium chloride.

The present disclosure relates to a method of carbon dioxide mineralisation, the method comprising: treating a material, such as a mineral, with carbon dioxide and a base, wherein the treatment occurs in solution phase, the material comprising: a first cation that is Ca or Mg; a second cation which is not Ca and or Mg; and one or more anions which are not carbonate; such that a product solution comprising an acid or a salt of the base and one of the one or more anions and a salt of the second cation and one of the one or more anions is formed, and a carbonate salt of the first cation is caused to precipitate.