11 results about "Double salt" patented technology

This invention discloses a system for producing ammonium sulfite using electrolytic manganese ammonium sulfate double salt. The system includes a drum high-temperature drying device. The electrolytic manganese ammonium sulfate mixture output from the drum high-temperature drying device is fed into a crushing device via an elevator. The electrolytic manganese ammonium sulfate mixture output from the crushing device is fed into an anaerobic calcining furnace. A three-stage electrostatic precipitator is connected to the rear end of the anaerobic calcining furnace. The exhaust gas, after dust removal by the three-stage electrostatic precipitator, is sent to a multi-stage absorption and conversion tower via an exhaust gas pipeline. The conversion liquid and the completed absorption liquid after passing through the multi-stage absorption and conversion tower are sent to an evaporation device. This system and method for producing ammonium sulfite using electrolytic manganese ammonium sulfate double salt improves the calcination effect through pretreatment such as drying and crushing, and ultimately converts the ammonium sulfate into sulfur dioxide through anaerobic calcination to prepare ammonium sulfite. The difference lies in the direct blending and calcination method used in domestic and international processes.

This invention relates to a method for recovering ammonium components during the production of sodium bicarbonate from sodium sulfate, belonging to the field of chemical production technology. The recovery method includes: pretreating a crystallization mother liquor containing sodium sulfate, ammonium sulfate, ammonium bicarbonate, and diammonium carbonate, then mixing it with sodium sulfate and crystallizing to obtain a liquid-solid mixture; separating fine particles from coarse crystals in the liquid-solid mixture to obtain a coarse crystal slurry and a slurry containing fine particles, respectively; performing solid-liquid separation on the obtained coarse crystal slurry to obtain a double salt and a filtrate; and mixing the obtained double salt with a solution for washing to obtain solid sodium sulfate and a solution of ammonium sulfate. The recovery method provided by this invention has advantages such as a short process flow, simple operation, and no environmental pollution risk. This method not only avoids high-temperature ammonia stripping and low-temperature freezing processes, reducing investment and operating costs and energy consumption, but also improves the ammonia recovery rate and enhances raw material utilization efficiency.

The application provides a low-grade high-silicon type niobium concentrate sulfuric acid smelting method and belongs to the field of niobium metallurgy. The application uses an activator, concentrated sulfuric acid and low-temperature roasting to convert niobium minerals into water-soluble salts and convert rare earth minerals into water-insoluble double salts. After roasting, the minerals are water-immersed to separate niobium from rare earth, silicates and other insoluble impurities. The niobium leaching solution is treated by a small amount of HF to remove impurities, and then is treated by TBP extraction, back extraction and heat treatment to obtain a niobium oxide product with a purity of more than 99%. The rare earth-containing filter residue can be treated by an alkali solution to obtain a rare earth hydroxide, and then is treated by hydrochloric acid leaching, extraction and carbon precipitation process to obtain a rare earth carbonate product. The application solves the problems of low niobium leaching rate of Baotou low-grade high-silicon type niobium concentrate and industrialization of sulfuric acid smelting, and has the advantages of simple process, high element yield, low production cost, energy saving and emission reduction.

The application discloses a method for preparing two-dimensional metal nitride by using bulk metal oxide powder, which comprises the following steps: 1) uniformly mixing and grinding metal oxide powder with alkali metal carbonate or alkali metal hydroxide; adding neutral alkali metal or alkali earth metal halide salt, and uniformly mixing and grinding again; 2) performing heat preservation reaction on the mixture obtained in the step 1) under ammonia atmosphere, and cooling; 3) performing acid washing on the reaction product obtained in the step 2), washing to neutral, performing suction filtration and centrifugation, and drying, so as to obtain two-dimensional metal nitride in nanosheet shape. The application firstly proposes a method for preparing two-dimensional metal nitride nanosheet by using alkaline-neutral mixed double salt as an auxiliary, and the alkali metal carbonate or alkali metal hydroxide is used as a reactant to synthesize an intermediate of alkali metal oxide with two-dimensional layer-like structure, and the neutral alkali metal or alkali earth metal halide salt is used as a molten salt auxiliary agent to promote the nitridation conversion of the alkali metal oxide. The method is suitable for preparing two-dimensional niobium nitride by using bulk niobium oxide, two-dimensional tungsten nitride by using bulk tungsten oxide, and two-dimensional molybdenum nitride by using bulk molybdenum oxide, and is related to a simple process and low cost.

The application discloses a method for removing impurities and recycling potassium resources from an alumina production system, and belongs to the technical field of non-ferrous metallurgy and resource comprehensive utilization. In view of the problem that potassium impurities in the circulating lye in the Bayer alumina production process continuously accumulate, and affect the production stability and alkali consumption, the application introduces sodium sulfate into the alkaline solution of the system, and through accurate control of the reaction temperature, alkali concentration and crystallization time, the potassium, sodium and sulfate ions in the solution are selectively combined, and the potassium sodium sulfate double salt solid is crystallized and separated out, so that the product is obtained after solid-liquid separation. The liquid is returned to the main process of the alumina after being purified by evaporation, the separated impurity salt is treated by causticization, and a reaction system is formed with the circulating mother liquor. The application has the advantages of simple process, effective connection with the existing alumina production line, impurity purification and valuable element extraction of the alumina system, and environmental and economic benefits.

This invention provides a film-forming material, a film-forming slurry, a spray coating, and a spraying component. A coating is formed using a film-forming material containing particles of a crystalline phase comprising rare earth element fluorides, particles of a crystalline phase comprising rare earth element oxides, and particles of a crystalline phase comprising rare earth element ammonium fluoride double salts; or, the film-forming material contains particles of a crystalline phase comprising rare earth element fluorides and particles of a crystalline phase comprising rare earth element oxides and a crystalline phase comprising rare earth element ammonium fluoride double salts. If a spray coating is formed using the film-forming material or the film-forming slurry, a rare earth element oxyfluoride spray coating can be formed without excessive heat. Therefore, even under atmospheric conditions, oxidation reactions caused by spraying heat are suppressed, resulting in a rare earth element oxyfluoride spray coating with low levels of rare earth element fluorides and rare earth element oxides. Furthermore, coating peeling caused by excessive heat can be suppressed.

The utility model provides a kind of double salt crystallization device of production sodium sulfate and ammonium sulfate, including reactor, upper cover, salt adding mechanism, cooling mechanism, reactor is sequentially divided into clear liquid section, transition section, reaction section from top to bottom, center tube is equipped in reactor, clear liquid section side is equipped with reaction liquid collection tank, reaction liquid collection tank is connected with the upper portion of center tube by pipeline, overflow pipe is equipped with in clear liquid section top side, reaction section is equipped with crystal taking port, salt adding mechanism includes salt adding circulating pump, salt adding pipe, salt adding circulating pump is arranged in upper cover center, outlet is connected with the upper end of center tube, upper cover salt adding mouth is communicated with the lower portion of center tube by salt adding pipe, cooling mechanism includes cooling circulating pump, external cooler, cooling circulating pump is arranged in upper cover, cooling circulating pump inlet passes through upper cover and extends into reactor clear liquid section, cooling circulating pump outlet is connected with the lower end of external cooler by pipeline, external cooler upper end is connected with liquid collection tank by pipeline.The utility model integrates reaction equipment, compact structure, comprehensive function.

The present application relates to a kind of based on organic sulfonic acid scandium double salt precipitation scandium recovery method, comprising: using sulfuric acid to the scandium concentrate is treated by acid immersion to obtain the scandium-containing leaching solution;Scandium-containing leaching solution is adjusted to alkaline pH, and precipitate to obtain coarse scandium hydroxide;Coarse scandium hydroxide is reacted with organic sulfonic acid to obtain organic sulfonic acid scandium salt;Organic sulfonic acid scandium salt is mixed with saturated sulfate solution and carries out double salt precipitation, and separation is obtained containing scandium double salt;Scandium double salt is washed, precipitated by ammonia, acid dissolution, oxalate precipitation and high temperature calcination, and high-purity scandium oxide is obtained.The present application combines organic sulfonic acid scandium salt and sulfate for the first time to construct a new double salt precipitation system, which can realize efficient and high-selectivity separation of scandium, various rare earth elements and conventional metal impurities in a single precipitation, and obtain scandium oxide with purity higher than 99.9%.The total recovery rate of scandium is more than 85%.The process is simple, without complex saponification process, reducing the generation of salt-containing and ammonia-containing wastewater, and reducing equipment investment and operating cost.

A system for preparing aluminum compounds using waste sulfuric acid and a method thereof are disclosed. The system includes a storage tank, a first reaction tank, an impurity removal device, a second reaction tank, an evaporator, and a crystallizer. The storage tank supplies a waste sulfuric acid solution to the first reaction tank. The waste sulfuric acid solution reacts with an aluminum source to obtain an aluminum sulfate solution. The aluminum sulfate solution is directed to the evaporator to be concentrated into a saturated solution and then cooled and crystallized; or the waste sulfuric acid solution is delivered to the second reaction tank after impurities are removed, mixed with a sulfate to obtain an aluminum sulfate double salt solution. The aluminum sulfate double salt solution is evaporated and concentrated, and then cooled and crystallized.

This application relates to the field of sodium sulfate resource utilization technology, specifically disclosing a system and method for the resource-based production of sodium bicarbonate and ammonium sulfate from sodium sulfate waste salt or high-concentration wastewater. A method for the resource-based production of sodium bicarbonate and ammonium sulfate from sodium sulfate waste salt or high-concentration wastewater includes the following steps: S1: Dissolution: Prepare a solution from sodium sulfate waste salt or high-concentration wastewater; S2: Purification; S3: Carbonation; S4: Separation and drying; S5: Concentration and crystallization: Concentrate the mother liquor I, then add a sodium salt with a solubility greater than that of sodium sulfate and sodium bicarbonate at 0-5℃ to precipitate double salt crystals of sodium sulfate and sodium bicarbonate. After filtration and centrifugation, obtain the double salt product and ammonium sulfate solution. The double salt product is returned to step S3 for reuse; S6: Flash evaporation purification. The method for the resource-based production of sodium bicarbonate and ammonium sulfate from sodium sulfate waste salt or high-concentration wastewater of this application has the advantages of high sodium sulfate utilization rate and high product purity.