8results about "Magnesium nitrates" patented technology

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 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 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 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.

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.