14 results about "Bischofite" patented technology

This invention discloses a method for preparing high-quality low-sodium salt. The preparation method includes: providing a first raw material, a second raw material, and a base liquid, wherein the first raw material comprises a sodium-potassium saturated solution, the second raw material comprises magnesium chloride ore, and the base liquid comprises the following components: Na... + K + Mg 2+ C1 ‑ The process involves placing the base liquid in a DTB crystallization apparatus and simultaneously introducing the first and second raw materials at a first and a second feed rate, respectively, under a stirring speed of 500–700 rpm. After at least 80 minutes, intermittent discharge is performed, followed by solid-liquid separation to obtain high-quality low-sodium salt. The high-quality low-sodium salt prepared by this invention has a particle size greater than 150 μm in 96% of the product. Furthermore, the preparation method is simple and controllable, achieving precise particle size control in the low-sodium salt production process.

The invention discloses a method for preparing a humic acid anchored hydrotalcite coated Fe3O4 magnetic material based on salt lake bischofite and application, and belongs to the technical field of heavy metal adsorbents. The method comprises the following steps: preparing high-purity magnesium chloride hexahydrate by taking salt lake bischofite as a raw material, mixing with an aluminum source, hydrolyzing to generate a hydrotalcite precursor, and decomposing the nitrogen source to provide an alkaline environment to promote formation of a layered structure; humic acid is chelated with heavy metals through functional groups and is stably anchored on the surface of hydrotalcite, Fe3O4 is used as a magnetic substrate, the material is endowed with magnetism, and a hydrothermal one-step in-situ growth composite structure is realized. The composite material combines the advantages of humic acid, hydrotalcite and Fe3O4, the adsorption capacity is remarkably improved, chemical adsorption is enhanced, efficient solid-liquid separation is achieved, and the defects of traditional materials are overcome. When the bischofite is used as a heavy metal adsorbent, lead ions can be efficiently removed and rapidly recovered, the steps are simple, the cost is low, the effect is remarkable, a new way is developed for utilization of the bischofite in the salt lake, and the bischofite has subject and application values.

The invention provides a method for preparing hydrophobic magnesium hydroxide through a bischofite modified in-situ ammonium method, and relates to the technical field of salt lake secondary magnesium resource utilization. The method comprises the following steps: dissolving primary bischofite, filtering and removing impurities to obtain a pure bischofite solution; preparing an active modifier from octyltriethoxysilane, ethanol, deionized water and acetic acid; adding the bischofite solution and ammonia water into the active modifier at a constant speed, and magnetically stirring to obtain a white precipitate; and finally, washing and drying the white precipitate to obtain the hydrophobic magnesium hydroxide powder. Octyltriethoxysilane is added in the process of preparing magnesium hydroxide through an ammonium method, modification and precipitation are carried out synchronously, a secondary process is not needed, hydrophilic magnesium hydroxide is converted into hydrophobic magnesium hydroxide, the affinity of powder to water is greatly reduced, and the performance of the composite material is improved; the magnesium hydroxide powder material with high performance and high application value can be prepared, and the method has the advantages that a secondary process is not needed, and the performance of the composite material is improved.

The application relates to the technical field of refractory material preparation, and particularly discloses a preparation method of high-purity high-bulk-density sintered magnesia from salt lake. The method uses magnesium hydroxide produced by salt lake bischofite as raw material, obtains high-purity magnesium oxide powder through suspension furnace light burning, and then sequentially goes through fine grinding, ball pressing, maintenance, high-temperature calcination under oxygen-rich conditions and cooling to obtain sintered magnesia with high purity and high bulk density. By controlling the particle size and burning vector in the fine grinding process, introducing pre-pressing and exhaust devices in the ball pressing link, using shaft kiln waste heat in the maintenance link, combining the shaft kiln staged preheating-calcining-cooling process and oxygen-rich combustion conditions, the compressive strength and forming stability of the ball material can be significantly improved, and the densification and uniformity of the calcining process can be ensured. The method can fully utilize the salt lake magnesium resources, reduce the dependence on magnesite, and the prepared sintered magnesia has excellent performance of MgO content being greater than or equal to 99.0%, bulk density being greater than or equal to 3.40 g / cm 3 , and can meet the application requirements of high-end refractory materials.

The utility model discloses a device for preventing secondary crystallization of subcholafite in the conveying process of old brine in a salt pan, which comprises a brine pipe, a brine pump connected with the brine pipe, an adsorption tower connected with the brine pump and a liquid storage tank connected with the adsorption tower, and is characterized in that an inlet of the brine pipe is connected with a subcholafite diluting device; the subchlorite diluting device comprises a diluting water tank, the diluting water tank is connected with a diluting water pipe, the diluting water pipe is connected with a diluting water pump, one end of the diluting water pipe is provided with a diluting distributor, and the diluting water pipe is fixedly connected with the brine pipe through the diluting water distributor; according to the dilution water dilution equipment provided by the device, brine crystal minerals at the inlet of the upstream brine pipeline pump are dissolved technologically, pipeline crystallization can be avoided, blockage of a subsequent system is reduced, stable operation of the equipment is ensured, and the brine conveying efficiency is improved.

The invention relates to magnesium formate and a preparation method thereof, and the preparation method of the magnesium formate comprises the following steps: by taking bischofite and ammonium formate as raw materials, carrying out liquid phase reaction in a water phase medium to generate a mixture containing the magnesium formate and ammonium chloride; and solid magnesium formate is separated from the mixture. According to the invention, bischofite (MgCl2. 6H2O) is innovatively selected as a magnesium source, and the substance is a cheap by-product in industrial processes of extracting lithium from a salt lake, preparing salt from seawater and the like and is wide in source, so that the cost of raw materials is greatly reduced. Meanwhile, ammonium formate (NH4HCOO) is adopted to replace traditional formic acid or organic amine and is stable in property, safe and easy to decompose, use of strong corrosive acid or toxic solvent is avoided from the source, and the development trend of green chemistry is met.

The invention relates to the technical field of hydrometallurgy, and particularly discloses a method for improving the flowability of magnesium oxide for cobalt precipitation and application. The method comprises the following steps: preparing industrial-grade magnesium hydroxide by taking a salt lake magnesium resource bischofite as a raw material through a brine-ammonia-lime combined method, calcining and finely grinding to obtain magnesium oxide with the particle size of less than 10 microns for cobalt precipitation, and mixing the magnesium oxide with a flow promoter according to the proportion of 0.5-3% to prepare the high-fluidity magnesium oxide cobalt precipitation agent. The flowability of the treated powder is improved by 20%-40%, and agglomeration and unsmooth discharging are effectively avoided. The high-fluidity magnesium oxide shows excellent fluidity and high efficiency in the cobalt precipitation process, the cobalt precipitation rate is not lower than 97%, and the cobalt precipitation rate is increased by 6.5% under the optimal condition. The method is simple and convenient in process, low in modifier cost, suitable for industrial popularization and application of an existing wet-process cobalt extraction production line, capable of being expanded to a wet-process nickel precipitation process and remarkable in economic and environmental benefits.

The application discloses a preparation method of a composite phase change material for solving the supercooling problem of sodium acetate trihydrate, and relates to the technical field of phase change material production, and comprises the following steps: S1, 30 g of natural crystalline bischofite is weighed, dried at 120 DEG C for 12 h, and then dissolved in 90 g of anhydrous ethanol to form a magnesium chloride solution; S2, the magnesium chloride solution is filtered by using a vacuum filtration bottle, and insoluble substances are separated; the ethanol component in the obtained solution after filtration is evaporated by using a rotary evaporator, and a precipitate, magnesium chloride hexahydrate MgCl2.6H2O, is obtained; S3, the magnesium chloride hexahydrate MgCl2.6H2O is combined with sodium acetate trihydrate SAT at an optimized mass ratio of 3:17; and S4, after complete melting and uniformity, 1% sodium polyacrylate PAAS is added as a thickening agent, and the mixture is packaged in expanded graphite EG. The method can realize effective utilization of the by-product bischofite of a salt lake, and simultaneously solve the supercooling problem of SAT.

This invention discloses a method for low-temperature roasting of magnesia from hydromagnesia, the resulting magnesium oxide, and its applications. The method includes: mixing a solution containing magnesia-chlorite with magnesia, drying and crushing the magnesia, followed by a one-step calcination to obtain magnesium oxide. The method provided by this invention ensures complete decomposition of magnesia while lowering the decomposition temperature, resulting in the production of magnesium oxide with higher activity and purity. It also effectively reduces energy consumption and CO2 emissions during the production process. Furthermore, the magnesium oxychloride cementitious material prepared using the aforementioned magnesium oxide exhibits superior mechanical properties.

The invention provides a method for improving magnesium ion conversion rate and enhancing magnesium hydroxide production efficiency, and relates to the technical field of magnesium hydroxide preparation. The method comprises the following steps: preparing the waste bischofite into a solution, adding solid sodium chloride or potassium chloride, carrying out a dissolution reaction, adding ammonia water after the pH and the conductivity of a reaction system are completely stable, ending the reaction when the pH and the conductivity of the reaction system are not increased any more, filtering to obtain magnesium hydroxide, collecting a mixed solution containing sodium and potassium, and concentrating for recycling. According to the method, the primary conversion rate of magnesium ions can be increased by 10% or above, and the production efficiency of magnesium hydroxide under the same condition can be increased by 15% or above. The method can solve the problem of low magnesium ion conversion rate in the production process of preparing magnesium hydroxide by a chemical method, reduces the energy consumption in the reaction process, improves the production efficiency of magnesium hydroxide, and has great economic value.

The invention discloses a magnesium-aluminum hydrotalcite-based radiation cooling cotton fabric based on salt lake bischofite and a preparation method thereof, and the preparation method specifically comprises the following steps: drying natural crystal bischofite, dissolving in absolute ethyl alcohol, filtering, and evaporating to obtain bischofite; soaking the cotton fabric in a sodium hydroxide solution, heating, washing and drying; the preparation method comprises the following steps: respectively dissolving bischofite, aluminum chloride hexahydrate and urea in deionized water, mixing the obtained bischofite solution, aluminum chloride hexahydrate solution and urea solution, placing the mixture in a reaction kettle, soaking the cotton fabric in the reaction kettle for reaction, washing and drying. The magnesium-aluminum hydrotalcite-based radiation cooling cotton fabric prepared by the invention has high sunlight reflectivity, intermediate infrared emissivity and radiation cooling performance. The sunlight reflectivity of the radiation cooling cotton fabric exceeds 90%, the mid-infrared emissivity exceeds 75%, the radiation cooling temperature exceeds 5 DEG C, and thermal comfort can be provided for a human body in a hot environment under the condition that no power resource is consumed.

The invention discloses a magnesium-lithium alloy preparation method based on ammonia dehydration and molten salt electrolysis coupling, which comprises the following steps: putting bischofite and lithium chloride into a dehydration tank of an integrated reactor, and carrying out ammonia dehydration at 180-300 DEG C for 0.5-4 hours to obtain a solid material; and the solid material is conveyed to a fused salt electrolytic bath of the integrated reactor, direct current is introduced at the temperature of 450-550 DEG C for electrolytic treatment, and the magnesium-lithium alloy is prepared at a cathode through co-electro-deposition. The high-performance and high-purity magnesium-lithium alloy is directly obtained by forming a stable ammoniated ion cluster, optimizing the physical and chemical properties of the electrolyte, inhibiting side reaction, improving the current efficiency and accurately controlling the alloy phase composition and the microstructure. The problems that in the prior art, dependence on an inert gas protection system is caused, the technological process is fragmented, dehydration is difficult, and the alloy purity is low are solved.

The invention discloses a method for preparing micron-sized magnesium hydroxide by utilizing low-grade bischofite and application of the micron-sized magnesium hydroxide. In the process of preparing a refined magnesium chloride solution by dissolving high-grade bischofite, low-grade bischofite (salty mud) generated by filter pressing is used as a raw material, water is added to dissolve the settled filtrate, an anionic surfactant and a chelating agent are added, the mixture and diluted ammonia water are synchronously dropwise added for co-precipitation crystallization, and the micron-sized magnesium hydroxide is obtained through suction filtration, washing and drying. Wherein the co-precipitation method is combined with SDBS and EDTA-2Na dual additives and alkali metal ions K < + > and Na < + > for cooperative regulation and control, nucleation and crystal growth are synchronously controlled, seed crystals do not need to be added, and the problems that in a traditional process, the product particle size distribution is wide, and the crystal shape is irregular are solved. Magnesium hydroxide has uniform particle size distribution (D50 = 1.60-1.80 [mu] m, D97lt, 5 [mu] m), the purity is greater than or equal to 99.3%, and the whiteness is gt; 97%. Meanwhile, solid waste magnesium resources are used as raw materials, solid waste resource utilization is achieved, and the method can be used in the high-end fields of medicine, food, flame-retardant materials and the like.

The invention discloses a process for preparing magnesium carbonate trihydrate whiskers from sea brine. The process comprises the following steps: carrying out nanofiltration on seawater subjected to decalcification and carbon sequestration, introducing carbon dioxide, carrying out bipolar membrane electrodialysis, carrying out a mineralization crystallization process, filtering a product and recycling mother liquor, fresh seawater obtained after the nanofiltration step is a raw material solution of a bipolar membrane electrodialysis salt chamber, alkali liquor obtained after bipolar membrane electrodialysis reacts with concentrated seawater obtained after the nanofiltration step and bischofite for crystallization, and mother liquor obtained after filtration in the crystallization process is mixed with seawater obtained after decalcification and carbon sequestration for nanofiltration again. According to the process for preparing the magnesium carbonate trihydrate whiskers from the sea brine, provided by the invention, fine magnesium chemical products with high added values are prepared while mineralization and fixation of carbon dioxide are realized, and cyclic utilization of system resources is facilitated.