21results about "Magnesium nitrates" patented technology

A method of manufacturing a nanocomposite may include combining a magnesium salt, an aluminum salt, and a ferric salt in stoichiometric proportions within 5 mol. % in an aqueous solvent including menthol or dextrose, to obtain a first mixture, heating the first mixture to remove at least 99.5 wt. % of the aqueous solvent to obtain a first solid, grinding the first solid into a first powder, calcining the first powder at a temperature of about 600° C. to 800° C. for a time of about 2 to 4 hours to obtain a second solid, grinding the second solid and urea, in an amount sufficient to form the nanocomposite, into a second powder, heating the second powder at a temperature of about 550° C. to 650° C. for a time of about 15 minutes to 1.5 hours to obtain the nanocomposite.

The invention relates to the technical field of resourceful treatment of aluminum etching liquid, and particularly discloses a display panel aluminum etching liquid waste acid resourceful treatment process which comprises the following steps: adsorbing display panel aluminum etching liquid waste acid through mesoporous silica, and filtering to obtain three mixed acid liquid; distilling the third mixed acid solution to obtain a dilute phosphoric acid solution and a second mixed acid solution, and concentrating and purifying the dilute phosphoric acid solution to obtain industrial phosphoric acid with the concentration of 85%; and carrying out neutralization reaction on the secondary mixed acid liquor, calcium hydroxide and magnesium oxide to obtain the CMA snow-melting agent. Metal ions in the waste acid can be effectively removed through mesoporous silica adsorption, and the purity of the product is improved.

The invention discloses a method for preparing calcium sulfate and magnesium oxide and recovering nitric acid from a calcium and magnesium containing leaching solution of a chemical mineral separation byproduct. The method comprises the following steps: carrying out decalcification treatment on the calcium and magnesium containing leaching solution to obtain calcium sulfate and a decalcification solution containing dilute magnesium nitrate; evaporating the decalcified filtrate to obtain a solid-liquid mixture containing 72-76% of magnesium nitrate crystals; mixing dilute nitric acid with the solid-liquid mixture for reaction to obtain high-concentration nitric acid steam and a solid-liquid mixture of 52-56% magnesium nitrate crystals; separating the solid-liquid mixture to obtain magnesium nitrate crystals; dehydrating the magnesium nitrate crystal, and performing thermal decomposition to obtain magnesium oxide and a gas mixture; treating the nitric acid steam through a stripping section and a rectifying section of the concentration tower to obtain nitric acid steam with the concentration of 98% or above; nitric acid steam enters the bleaching tower to react to obtain finished nitric acid and concentrated nitric acid, and part of concentrated nitric acid flows back to the bleaching tower and the rectifying section of the concentration tower. According to the method, efficient utilization of chemical mineral separation byproducts is achieved, high-purity calcium sulfate and magnesium oxide products are prepared, and efficient recycling of nitric acid is achieved.

The application discloses a high-efficiency magnesium nitrate denitration device, which is characterized by being provided with a magnesium nitrate solution buffer tank and an M-shaped baffle distribution plate, the M-shaped baffle distribution plate comprises a center plate, two wing return plates and end baffle plates, the center plate and the baffle plates are horizontally arranged and are each provided with a protruding cofferdam at an outer edge, the two wing return plates are provided with fluid holes and are arranged at an angle with the center plate and the baffle plates, the outer edges of the two wing return plates in the axial direction are also provided with cofferdams, and the axial ends of the two wing return plates are open; the buffer tank can effectively buffer the scouring impact force of heavy component magnesium nitrate due to height difference, meanwhile, the sawtooth structure at the upper end of the tank body can make the magnesium nitrate solution uniformly overflow to the M-shaped baffle distribution plate, so that the corrosion and scouring damage of the magnesium nitrate heater tube can be reduced from the source, and the service life of the heat exchange equipment is prolonged; and the M-shaped baffle distribution plate can prolong the flow and residence time of the solution on the M-shaped baffle distribution plate, so that the denitration effect is improved.

This application discloses an air-suspension granulation technology for preparing spherical magnesium nitrate hexahydrate, belonging to the field of magnesium nitrate hexahydrate granulation technology. It includes magnesium nitrate hexahydrate purification and granulation. This application incorporates a hydrophobic agent to form a robust microscopic protective layer, which effectively blocks water molecule intrusion and has a low moisture absorption rate. Furthermore, the air-suspension granulation tower technology is redesigned to better handle surface free water, resulting in higher magnesium nitrate purity, better crystal form, and better applicability to various magnesium nitrate applications. The particle size of the magnesium nitrate hexahydrate particles prepared by this application can be adjusted according to the air velocity, ranging from 0.5 to 12 mm. This technology has a wide range of applications, low cost, high sphericity, and eliminates the need for subsequent separate processing of broken particles, reducing labor costs and improving production efficiency. The magnesium nitrate hexahydrate also exhibits high purity, few impurities, and high product quality.

The invention provides a method for improving the filtering performance of an aluminum precipitation material under a laterite-nickel ore nitric acid system, and relates to the technical field of chemical metallurgy. S2, carrying out homogeneous aluminum precipitation reaction on the iron precipitation mother liquor, a precipitator and an additive at a certain temperature to obtain aluminum hydroxide and aluminum precipitation mother liquor; s3, adding magnesium oxide into the aluminum precipitation mother liquor, and carrying out homogeneous precipitation reaction at a certain temperature to generate MHP and nickel and cobalt precipitation mother liquor; and S4, the nickel and cobalt precipitation mother liquor is applied to a homogeneous aluminum precipitation section through membrane treatment and sulfate circulation. The addition of the additive does not introduce new impurities, and the additive is recycled after sulfate is separated from a nitric acid system through a nanofiltration membrane treatment technology. The whole process realizes cyclic utilization of resources, and has a remarkable effect and a huge economic value.

The invention provides a method for extracting valuable elements from coal-series solid waste water through thermal cycle leaching, and belongs to the technical field of coal-series solid waste resource utilization. According to the method, the pretreated coal-series solid waste powder and the acid liquor are mixed and then subjected to the leaching reaction, and valuable elements can be dissolved into the acid leaching liquor; boehmite can be produced by subjecting the pickle liquor to a pressurized hydrothermal decomposition reaction. According to the method, the hydrolysate and the pretreated coal-series solid waste powder are mixed and then subjected to the pressure leaching reaction, and valuable elements in the pretreated coal-series solid waste powder can be released into the leachate through hydrogen ions in the hydrolysate. According to the method, the leachate is completely circulated, part of acid leaching liquid is supplemented, then the pressurized hydrothermal decomposition reaction is performed to obtain hydrolysate and boehmite, calcium and magnesium are enriched in the repeated circulation process, and calcium salt and magnesium salt products are obtained through crystallization treatment. According to the method provided by the invention, the coal-series solid waste is efficiently recovered and treated to produce boehmite, byproducts can be produced, and meanwhile, the method also has good environment-friendly and energy-saving properties.

The invention provides a method for comprehensively recycling a fluorine-fixing cathode carbon block, which realizes the effective recovery of carbon resources and fluorine resources in the waste cathode carbon block through the working procedures of low-temperature fused salt conversion, wet grinding leaching, wet grinding alkaline conversion, neutralization, acid leaching, flotation, evaporative crystallization and the like on the waste cathode carbon block. According to the method, conversion and separation of fluorides and cyanides in the waste cathode carbon blocks are achieved through low-temperature molten salt conversion and wet grinding leaching, fluorinated products enter the leaching residues, cyanidation products are converted into nitrate products to complete detoxification of the cyanides and enter the leaching liquid, the leaching residues are subjected to wet grinding alkali conversion separation to obtain alkali conversion residues and alkali conversion liquid, and the alkali conversion residues and the alkali conversion liquid are recycled. Neutralizing the alkali transfer liquid, and performing evaporative crystallization to obtain sodium fluoride; and the alkali transfer slag is subjected to sulfuric acid leaching, flotation and other operations to obtain graphite, gypsum and recyclable magnesium nitrate hexahydrate, and resource utilization of the waste cathode carbon blocks is achieved.

The present application belongs to the technical field of waste liquid treatment, and particularly relates to a graphite purification waste liquid treatment method and a treatment system. The present application introduces a pre-acid pickling system to utilize waste acid twice, reduces the amount of acid used in the acid pickling process of graphite purification, improves the use efficiency of acid liquid, thereby reducing the cost of the graphite purification process and significantly enhancing the overall economy. The present application also introduces a sodium fluorosilicate production line, effectively realizing the resource utilization of residual fluorosilicic acid and fluorosilicate in waste water. Not only can the operation cost of reagents in the subsequent water treatment process be effectively reduced, but also the produced sodium fluorosilicate can be sold to improve economic benefits. An evaporation crystallization system is used to crystallize and recover valuable salts in waste water. The obtained crystalline salt can be further used as a raw material for other products. The treatment system provided by the present application can realize the resource utilization and recycling of waste acid and waste water, and achieve zero emission.

The invention relates to the synthesis of ternary MgCaA1 layered double hydroxides (LDH) from eggshells, functionalization of the synthesized LDHs with different polymers, and the use of these obtained new composites in CO2 capture applications.

The invention relates to a method for improving the grain size of magnesium nitrate hexahydrate crystals, and belongs to the technical field of magnesium nitrate hexahydrate crystals. The invention mainly solves the technical problems of small crystal granularity, slender and fragile crystal shape, easy hardening and poor crystallization efficiency in the existing magnesium nitrate hexahydrate crystallization process. According to the technical scheme, the method for improving the grain size of the magnesium nitrate hexahydrate crystal comprises the following steps: 1) preparing a magnesium nitrate solution, namely adding a magnesium oxide solid into a certain amount of water, adjusting the pH value by using nitric acid with a certain concentration, and filtering to remove impurities in the solution; 2) concentration of the magnesium nitrate solution: putting the magnesium nitrate solution without impurities into an evaporator, and concentrating the magnesium nitrate solution at high temperature; 3) seed crystal preparation: grinding a magnesium nitrate solid with a mortar, and grinding into small particles for later use; and 4) cooling crystallization: pouring the magnesium nitrate concentrated solution obtained in the step 2) into a crystallizer, rapidly cooling to 45-65 DEG C, then adding a seed crystal, and centrifuging after cooling to 25-45 DEG C to obtain magnesium nitrate particles. The method has the advantages that the operation is simple, the crystal shape is granular, the granularity is large and uniform, the crystallization efficiency is high, and the like.

The embodiment of the invention provides a solution for preparing an electrolyte, a preparation method of the solution, the electrolyte, a preparation method of the electrolyte, a lithium ion battery and an electric device. The solution comprises a non-aqueous solvent and magnesium nitrate, and the non-aqueous solvent comprises an ester solvent; the water content a of the solution is less than 100 ppm. Magnesium nitrate is dissolved in the solution, the solution has extremely low water content, and the electrolyte prepared from the solution can contain magnesium nitrate, has the advantages of low water content and difficulty in deterioration, and is beneficial to prolonging the cycle life of the lithium ion battery when being applied to the lithium ion battery.

The invention discloses an air suspension granulation technology for preparing spherical magnesium nitrate hexahydrate, and belongs to the technical field of magnesium nitrate hexahydrate granulation, the air suspension granulation technology comprises magnesium nitrate hexahydrate purification and magnesium nitrate hexahydrate granulation, a hydrophobic agent is added to form a firm microscopic protection layer, and the protection layer can effectively block water molecule invasion and is low in moisture absorption rate; the air suspension granulation tower is redesigned, so that free water on the surface can be better treated, the magnesium nitrate purity is higher, the crystal form is better, and the air suspension granulation tower can be better suitable for various use occasions of magnesium nitrate; the particle size of the magnesium nitrate hexahydrate particles prepared by the method is adjusted according to the air speed, the magnesium nitrate hexahydrate particles with the particle size range of 0.5-12 mm can be prepared, the application range is wide, the cost is low, the spherical yield is high, subsequent separate treatment of crushed products is not needed, the labor cost is reduced, and the production efficiency is improved; the magnesium nitrate hexahydrate is high in purity, few in impurities and high in product quality.

An improved beta(β)-spodumene (~LiAlSi2O6) nitric acid conversion process produces discrete lithium (Li), aluminum (Al) and silica (SiO2) materials by: (i) converting lithium nitrate, LiNO3, to lithium carbonate, Li2CO3; (ii) creating a Al-rich precipitate either by thermally decomposing aluminum nitrate, Al(NO3)3, or by reacting AI(NO3)3 with aqueous and / or solid ammonium carbonate, (NH4)2CO3; and (iii) forming a solid SiO2-rich aluminosilicate residue by selectively leaching Li and Al from β-spodumene. Three key reactants consumed during processing nitric acid (HNO3), ammonia (NH3). and magnesium oxide (MgO) -may be regenerated internally by closed-loop chemical cycles, this feature of the process greatly improving its economics in commercial applications.

The present invention discloses a method for utilizing reaction heat in the preparation process of magnesium nitrate, which relates to the technical field of magnesium nitrate production. After magnesium oxide and tap water are homogenized, they enter a first-stage tubular reactor together with nitric acid. After reacting at 118 - 123 °C for 1 - 1.2 minutes, they enter a second-stage tubular reactor, and nitric acid is supplemented. The reaction ends when the pH value in the second-stage tubular reactor reaches 4 - 5. The filtrate obtained by pressure filtering the reaction material is crystallized and centrifuged to obtain magnesium nitrate hexahydrate crystals. Among them, cold circulating water is introduced into the jacket of the first-stage tubular reactor, and when the water temperature reaches 95 - 98 °C, it is used as the heat supplement for the second-stage tubular reactor, fully utilizing the reaction heat, shortening the reaction time, and saving the production cost.

Provided are a solution for preparing an electrolyte and a preparation method therefor, an electrolyte and a preparation method therefor, a lithium-ion battery, and an electric device. The solution comprises a non-aqueous solvent and magnesium nitrate, wherein the non-aqueous solvent comprises an ester solvent; and the water content a of the solution satisfies: a<100 ppm. The solution contains magnesium nitrate dissolved therein and has an extremely low water content. An electrolyte prepared from the solution can contain magnesium nitrate and has the advantages of a low water content and a low probability of deterioration; and when being used in a lithium-ion battery, the electrolyte is conducive to improving the cycle life of the lithium-ion battery.

The utility model relates to the technical field of magnesium nitrate crystallization, in particular to evaporation equipment for producing and processing crystal magnesium nitrate, which comprises a bottom plate, and a heating plate is mounted on the outer wall of an evaporation barrel. According to the evaporation equipment for crystal magnesium nitrate production and processing, through cooperation of the rotating mechanism and the evaporation barrel, collection of evaporated crystals of a magnesium nitrate solution is achieved, the evaporated crystals are scraped off through the inclined scraping plate and discharged from the lower end of the evaporation barrel in an inclined mode, and manual collection by workers is not needed; through cooperation of a swing mechanism and an air heater, steam at the upper end of the evaporation barrel is discharged from a through hole in the left side of the evaporation barrel through the air heater and the swing mechanism; the air circulation speed in the evaporation barrel is increased, the evaporation speed of the magnesium nitrate solution is increased, the evaporation efficiency is improved, and the working efficiency is improved.

The invention relates to the synthesis of ternary MgCaA1 layered double hydroxides (LDH) from eggshells, functionalization of the synthesized LDHs with different polymers, and the use of these obtained new composites in CO2 capture applications.

An improved beta (beta)-spodumene (-LiAlSi2O6) nitric acid conversion process produces discrete lithium (Li), aluminum (Al) and silicon dioxide (SiO2) materials by (i) converting lithium nitrate LiNO3 to lithium carbonate Li2CO3; (ii) producing an Al-rich precipitate by thermal decomposition of aluminum nitrate Al (NO3) 3 or by reaction of Al (NO3) 3 with aqueous and / or solid ammonium carbonate (NH4) 2CO3; and (iii) forming a solid SiO2-rich aluminum silicate residue by selectively leaching Li and Al from the beta-spodumene. Three key reactants such as nitric acid (HNO3), ammonia (NH3) and magnesium oxide (MgO) consumed in the processing process can be regenerated internally through closed-loop chemical circulation, and the economical efficiency of the method in commercial application is greatly improved due to the characteristic of the method.

The present invention discloses a method for preparing anhydrous magnesium salt, comprising the steps of: subjecting anhydrous magnesium formate and an ammonium salt composed of anions of the anhydrous magnesium salt to be produced and ammonium ions to a solid-phase reaction or a liquid-phase reaction at a predetermined temperature to produce anhydrous magnesium salt, formic acid, and ammonia; removing volatilized formic acid and ammonia and ammonium formate synthesized by cooling the formic acid and ammonia, and obtaining the anhydrous magnesium salt. The method of the present invention is safe and reliable and can produce anhydrous magnesium salt of extremely high quality.

This application relates to the field of resource recovery technology for aluminum etching solutions, specifically disclosing a process for resource recovery of waste acid from display panel aluminum etching solutions. The process includes the following steps: adsorbing the waste acid from the display panel aluminum etching solution onto mesoporous silica, filtering to obtain a three-component mixed acid solution; distilling the three-component mixed acid solution to obtain a dilute phosphoric acid solution and a two-component mixed acid solution; concentrating and purifying the dilute phosphoric acid solution to obtain 85% industrial phosphoric acid; and neutralizing the two-component mixed acid solution with calcium hydroxide and magnesium oxide to obtain CMA de-icing agent. This application effectively removes metal ions from the waste acid through mesoporous silica adsorption, improving the purity of the product.