51 results about "Double salt" patented technology

The invention provides a low-grade high-silicon niobium concentrate sulfuric acid smelting method, and belongs to the field of niobium metallurgy. According to the method disclosed by the invention, niobium minerals are converted into water-soluble salts and rare earth minerals are converted into water-insoluble double salts by adopting an activating agent, concentrated sulfuric acid and low-temperature roasting, and the minerals after roasting are subjected to water leaching, so that separation of niobium from other insoluble impurities such as rare earth and silicate is realized; according to the process, a niobium leaching solution is subjected to impurity removal through a small amount of HF, and then is subjected to TBP extraction, reverse extraction and heat treatment to obtain a niobium oxide product with the purity being 99% or above; the filter residues containing the rare earth can be treated through alkali liquor to obtain rare earth hydroxide, and then the rare earth carbonate product is obtained through hydrochloric acid leaching, extraction and carbon precipitation processes. The method solves the problems that the Baotou low-grade high-silicon niobium concentrate is low in niobium leaching rate and sulfuric acid smelting cannot be industrialized, and has the advantages of being simple in process, high in element yield, low in production cost, energy-saving and emission-reducing.

The invention discloses a method for preparing large-particle sodium bicarbonate from sodium sulfate. The method comprises the following steps: pretreating raw materials; dynamically adjusting reaction conditions; establishing a raw material database; carrying out multistage continuous crystallization reaction; heat integration and waste heat recovery; the alkali medium is recycled; the temperature gradient design is simplified; double salt crystal separation and resource utilization, and bicarbonate radical concentration control; strengthening double salt separation by a membrane separation technology; and carrying out solid-liquid separation and product collection. In a sodium sulfate raw material dissolving stage, sodium carbonate or sodium bicarbonate is added to adjust the concentration of carbonate in a solution, so that the concentration is stabilized in a target range, ATR FT-IR is used for carrying out in-situ real-time quantitative analysis on carbonate ions in an aqueous solution, carbonate is automatically supplemented through feedback control, and the content of carbonate ions in the aqueous solution is determined. A plate heat exchanger is installed in a multi-stage reaction device, waste heat of previous-stage reaction liquid is utilized to preheat next-stage reaction liquid, and heat in mother liquor is recovered by adopting a vacuum evaporation technology in salting-out crystallization.

The present invention relates to a method for deep fluoride removal from sewage based on NH4F·LaF3 chemical precipitation. The specific steps are as follows: Add a solution containing NH4 + , La 3+ to the fluoride-containing water. After adjusting the pH of the sewage to 6-8, carry out the NH4F·LaF3 chemical precipitation reaction; discharge the precipitate and remove the crystal particles in the supernatant to achieve deep fluoride removal from the sewage. The fluoride ion concentration in the water after fluoride removal can be stably lower than 1 mg / L. The present invention utilizes the characteristic that the double salt NH4F·LaF3 has a very low solubility, and adds NH4 + ions (ammonium chloride or ammonia water + hydrochloric acid) and La 3+ ions (lanthanum chloride or lanthanum oxide + hydrochloric acid) to remove fluoride in the water. The lanthanum ions, ammonium ions, and fluoride ions react in an equivalent amount, so the dosage of the reagent does not need to be excessive. The present invention has the characteristics of high efficiency and low cost, with less dosage of the reagent, fast reaction speed, complete reaction, and low fluoride concentration in the effluent.

The present disclosure provides a method for extracting rare earth elements from industrial waste and other materials. The method includes pre-treating a starting material including but not limited to materials containing coal, coal ash, and mined aggregates, combining the pre-treated starting material with a first aqueous solution comprising one or more ionic salts in a first stage reactor to form a first slurry containing double-salt crystals, separating the first slurry in a first stage separator to obtain a double salt solution and separated impurities, combining the double salt solution with a second aqueous solution in a second stage reactor to form a second slurry, and separating the second slurry in a second stage separator to obtain a purified product and a remaining aqueous solution. The method enables efficient extraction of rare earth elements from industrial waste materials while producing a purified product.

The invention discloses a method for preparing high-purity rubidium chloride from rubidium crude salt, which comprises the following steps: (1) obtaining an acidic rubidium-containing solution from rubidium crude salt, and adding a precipitant to obtain a precipitate; (2) dissolving the precipitate to obtain a rubidium-containing double salt solution; (3) recrystallizing to obtain crystals; (4) washing the crystals to obtain high-purity crystals; (5) adding the high-purity crystals into water to carry out size mixing, and then adding ammonia water to react completely to obtain a solution containing rubidium chloride; according to the method for preparing the high-purity rubidium chloride from the rubidium crude salt, the purity of an obtained final product can reach 99.99% or above, the technological process is simple, the production process is environmentally friendly, raw material consumption and production cost are low, and a feasible technical scheme is provided for large-scale industrial production of the high-purity rubidium chloride.

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.

The invention provides a preparation method of ammonium ferrous sulfate, and relates to the technical field of inorganic salt preparation.The preparation method of the ammonium ferrous sulfate comprises the following steps that raw materials of iron and a sulfuric acid solution are taken and mixed for a reaction, and a ferrous sulfate solution is obtained; adding solid ammonium sulfate into the ferrous sulfate solution to obtain an ammonium ferrous sulfate solution; and taking the ammonium ferrous sulfate solution, filtering impurities, taking filtrate, and performing evaporative crystallization to obtain ammonium ferrous sulfate. Ferrous sulfate reacts with ammonium sulfate to form double salt ammonium ferrous sulfate, and since the electron configuration is affected by a ligand field, the electron configuration of ferrous iron in the double salt is not easy to oxidize due to the influence of the ligand field, and the ferrous iron is not easy to oxidize even if the ferrous iron is fully contacted with air in the filtering process; the method has the advantages that oxidation of ferrous ions is reduced, the impurity content is reduced, the product purity and the batch stability are improved, additional secondary purification treatment is not needed, and the technological process is simplified.

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 invention provides a particle size control method of perchlorate-based energetic double salt. The particle size control method comprises the following steps: step 1, preparing a solution; step 2, granularity control crystallization: directly pumping the perchlorate-based energy-containing double salt solution into a sample collection bottle according to a set feeding rate through a feeding pump, and meanwhile, introducing inert gas into the sample collection bottle according to a set gas flow rate through a pipeline gas flow regulator to carry out gas flow disturbance on the perchlorate-based energy-containing double salt solution, and stirring and dispersing the perchlorate-based energetic double salt in the solvent in the sample collection bottle, crystallizing, aging, filtering, washing and drying, and collecting to obtain the perchlorate-based energetic double salt with controlled particle size. According to the granularity control method, reaction parameters and conditions are easy to control stably, and the method is particularly suitable for preparing the ultrafine DAP-4 energetic material through crystallization.

The present invention discloses a method for extracting lithium from lithium-rich bauxite waste rock, belonging to the technical field of comprehensive utilization of solid waste. The method for extracting lithium from lithium-rich bauxite waste rock comprises the following steps: adding the roasted lithium-rich bauxite waste rock into a double salt solution, stirring for leaching and then filtering to obtain a leaching solution; carrying out refrigerated crystallization on the leaching solution and then filtering, and the filtrate is a lithium-rich leaching solution; wherein, the double salt solution comprises a potassium alum solution and / or an ammonium alum solution. Compared with the existing technology, the method of the present invention has the advantages of simple process, high lithium leaching rate, low requirements for equipment, recyclable leaching agent, low energy consumption, low extraction cost, few impurities in the leaching solution, environmental friendliness, etc., is easy to be industrially applied, and provides a new way and method for the development and utilization of lithium-rich bauxite waste rock and clay-type lithium ore resources.

A simple and efficient method for preparing high-purity rubidium chloride includes the following steps: Adding crude rubidium salt to glacial acetic acid, heating and stirring to dissolve, filtering to remove insoluble impurities, yielding a crude rubidium salt solution in glacial acetic acid; adding a certain amount of antimony trichloride solution to the crude rubidium salt solution in glacial acetic acid, stirring the reaction to obtain a small amount of pale yellow precipitate and solution until the reaction reaches equilibrium, yielding a clear liquid and precipitate, the precipitate being used to prepare high-purity cesium salt; secondary precipitation: adding a certain amount of tin tetrachloride solution in glacial acetic acid to the clear liquid, stirring the reaction to obtain a white precipitate and solution; standing, filtering, and washing: cooling and standing the solution until the reaction reaches equilibrium, filtering, washing the precipitate with glacial acetic acid, yielding a precipitate and washing liquid; double salt decomposition: adding high-purity water to the precipitate to form a slurry, then adding ammonia to adjust the pH value, filtering to obtain tin hydroxide precipitate and rubidium chloride solution; sending the filtrate for testing: evaporating the qualified rubidium chloride solution to dryness, calcining to obtain rubidium chloride; recrystallization: obtaining the high-purity rubidium chloride product. It has the advantages of effectively removing cesium ions from crude rubidium salt and avoiding the influence of alkali metal ions on the purity of the final product, without loss, and with high product purity.

The invention relates to the technical field of ore extraction, and provides a method for synergistically extracting lithium, rubidium and cesium from lepidolite through double salt roasting. According to the method, double salt composed of sulfate, chlorate and a calcium-containing compound is adopted as a roasting auxiliary, meanwhile, a microwave means is matched, the phase structure of lepidolite ore can be effectively changed, and a foundation is laid for subsequent leaching of lithium, rubidium and cesium; according to the method, the clinker subjected to microwave roasting is directly subjected to wet grinding in water, the leaching rate of rubidium and cesium is synergistically improved while the leaching rate of lithium is kept, the leaching rate of lithium is larger than 92%, the leaching rate of rubidium and cesium is larger than 80%, and full utilization of lithium, rubidium and cesium in lepidolite ore is achieved. Furthermore, after the lithium-rubidium-cesium leaching solution is obtained, an electrolytic method is adopted for rapid impurity removal, most of impurities can be removed, the alkali consumption of subsequent alkali impurity removal is reduced, and therefore the cost is reduced.

The invention belongs to the technical field of industrial solid waste treatment, and particularly relates to a harmless conversion treatment method of ardealite, which comprises the following steps of: preparing potassium ammonium gypsum solid solution double salt from ardealite, K2SO4 and (NH4) 2SO4 through a one-step synthesis process, and mutually replacing K < + > and NH4 < + > in any proportion to form a continuous solid solution in a crystallization process by utilizing the characteristics that the K < + > and the NH4 < + > are similar in ion radius and coordination; and constructing a stable double salt structure together with Ca < 2 + >, SO4 < 2-> and crystal water. The solid solution double salt can slowly release K < + > and NH4 < + > in soil, the potassium-ammonium ratio of the product is regulated and controlled by adjusting the ratio of K2SO4 to (NH4) 2SO4, the differentiated requirements of different crops on nutrients are met, a solid-liquid quantitative model is established based on a quaternary system phase diagram, a mother liquor circulation production process is performed, it is ensured that the system is stably located in a solid solution double salt crystalline region, the purity and consistency of the product are guaranteed, and the quality of the product is improved. And high-valued conversion and large-scale consumption of the phosphogypsum are realized.

The utility model discloses a mixed salt crystallization filtering device which comprises four supporting rods, a mounting table is fixedly arranged at the upper ends of the supporting rods, a filtering tank is fixedly arranged at the upper end of the mounting table, a tank cover is arranged at the upper end of the filtering tank, and the tank cover is in threaded connection with the filtering tank. A heating pipe is arranged at the lower end of the tank cover and is in threaded connection with the tank cover, a heating wire is fixedly arranged in the side wall in the heating pipe and is distributed in a spiral structure, an intercepting plate is fixedly arranged on the lower portion in the heating pipe, a liquid inlet pipe is fixedly arranged at the upper end of the tank cover and is communicated with the filtering tank, and a liquid outlet pipe is fixedly arranged at the lower end of the filtering tank. The structure solves the problems that when a mixed salt solution is filtered, particulate matters in the mixed salt solution easily cause blockage of the filter screen, and subsequent operation is difficult to carry out on crystals of mixed salt.

The invention discloses a high-voltage electrolyte for a supercapacitor and a preparation method of the high-voltage electrolyte, and belongs to the field of supercapacitors. The high-voltage electrolyte comprises acetonitrile, fluoro-ether and double salt; the double salts are quaternary ammonium salt electrolyte salts and imide lithium salts. Through the design of a solvent system and a double-salt system, the voltage window, the cycle life and the safety of the supercapacitor electrolyte are remarkably improved. The method has good compatibility with commercial supercapacitors, and is expected to be widely applied in the field of supercapacitors.

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 invention discloses a system and a method for prolonging operation of a carnallite crystallization device. The system comprises a carnallite crystallization device, a water inlet of the carnallite crystallization device is connected with a high-salinity water pipeline, and the carnallite crystallization device is configured to separate a saturated salt solution and secondary steam from the high-salinity water; the vacuum crystallization device is connected with an outlet of the carnallite crystallization device, the vacuum crystallization device is configured to pump out secondary steam, the vacuum device comprises a gas return pipeline, and the gas return pipeline is connected with a connecting pipeline between the carnallite crystallization device and the vacuum crystallization device; and the rotary drum drying device is connected with the carnallite crystallization device, and the rotary drum drying device is configured to pump out the saturated salt solution and separate salt in the saturated salt solution. Through cooperation of the vacuum crystallization device and the rotary drum drying device, the operation time of the carnallite crystallization device can be effectively prolonged, the maintenance and shutdown cost of the carnallite crystallization device can be reduced, and the environmental protection property of heavy salt water treatment can be improved.

The invention discloses a room-temperature curing water-based ceramic-based heavy-duty coating, and belongs to the field of anticorrosive coatings. The coating is composed of a component A and a component B, and is characterized in that the component A is composed of an isocyanate group-containing oligomer, dihydric phosphate, phosphate, phosphoric acid, a pigment filler, water and an auxiliary agent; and the component B is composed of an amino-containing oligomer, an oxide, a hydroxide, a pigment filler, water, a pH value regulator and an auxiliary agent. According to the component A and the component B, dihydric phosphate, phosphoric acid and metal hydroxides or oxides are subjected to an acid-base reaction to form amorphous phosphate double salt which serves as a main film forming substance of a coating, the metal hydroxides and oxides are excessive, and the residual metal hydroxides or metal oxides and pigments and fillers form pigments and fillers of the coating. And a heavy anti-corrosion coating system is jointly constructed. The prepared coating has excellent salt mist resistance, water resistance, brine resistance, condensation resistance and the like, and has an excellent protection function on a metal base material.

The invention relates to a double salt separation device and method, in particular to a sodium ammonium sulfate double salt separation device and method. In order to overcome the defects that in the prior art, energy consumption for separating sodium sulfate and ammonium sulfate from sodium ammonium sulfate double salt is too high, the separation cost is high, and industrial production is not facilitated, the sodium ammonium sulfate double salt separation device comprises a sodium sulfate crystallization system, a cooling crystallization system, an ammonium sulfate crystallization system and a heat pump system; a refrigerant is arranged in the heat pump system and used for coupling heat generated by cooling of the cooling crystallization system with heat needed by the sodium sulfate crystallization system and the ammonium sulfate crystallization system, and meanwhile a large amount of heat generated by state changes of the refrigerant is used for reducing energy consumption of the system. Meanwhile, the invention also provides a sodium ammonium sulfate double salt separation method based on the device.

The invention provides a recovery method and application of metal in a nickel cobalt lithium manganate positive plate. The recycling method comprises the following steps: crushing a nickel cobalt lithium manganate positive plate disassembled from a waste battery, and screening to obtain positive powder; the positive electrode powder and ammonium persulfate are mixed and then calcined at the temperature of 500 DEG C or below, a solid product obtained after calcination is dissolved in water to obtain leachate, and ammonia gas generated after calcination is collected; an ammonia water solution with the concentration of 25-35 wt.% is added into the leachate to be mixed, the pH value is controlled to be 3.5-4.5 through sulfuric acid for a certain time, a first mixed solution is obtained, the first mixed solution is crystallized at the low temperature, then solid-liquid separation is conducted, and double salt crystals containing nickel and cobalt and a second mixed solution containing lithium and manganese are obtained; and adding ammonium sulfide into the second mixed solution containing lithium and manganese to obtain manganese sulfide precipitate and a lithium-containing solution, and evaporating the lithium-containing solution to obtain lithium sulfate and ammonia gas. According to the recovery method, the reaction product is recycled, the problem of waste liquid treatment does not exist, the leachate can be obtained through low-temperature calcination and water leaching, and the energy consumption is low.

The invention belongs to the field of rare earth metallurgical metals, and provides a rare earth scandium recovery treatment process which comprises the following steps: carrying out acid leaching on scandium-containing waste residues to obtain acid leaching mother liquor; mixing ammonium sulfate, an acid solution and the acid leaching mother liquor to obtain ammonium scandium sulfate double salt coarse precipitate; and the ammonium scandium sulfate double salt coarse precipitate is subjected to acid pickling, metal impurities are removed, and a rare earth scandium product is obtained. Aiming at the problem that ammonium scandium sulfate as a soluble precipitate is not beneficial to high-efficiency recovery of scandium, the recovery treatment process provided by the invention uses ammonium sulfate and an acid solution for precipitation, can control the acidity in a reaction system and the corresponding relationship between ammonium ion concentration and ammonium scandium sulfate solubility, and can effectively improve the ammonium scandium sulfate precipitation rate to 99% or above; and impurities such as U, Th, Fe, Na and Cu can be effectively washed away, so that a rare earth scandium intermediate product with relatively high purity is prepared, and efficient recovery of scandium resources is realized.

The present disclosure relates to a double salt, a preparation method therefor, and a pharmaceutical composition containing same. More specifically, the present disclosure relates to a double salt consisting of magnesium ions, monovalent metal cations, phosphate ions, optional hydrogen phosphate ions, and optional hydroxide ions. The present disclosure further relates to a method for preparing the double salt, a pharmaceutical composition containing the double salt, a kit containing the pharmaceutical composition, the use of the double salt in the preparation of a drug for reducing the level of ammonia and / or ammonium ions and / or urea in the blood and / or digestive tract of a subject and preventing and / or treating a disease or condition associated therewith, and a method for preventing and / or treating a related disease or condition.

The invention discloses a method for preparing a hydrotalcite-like adsorbent from electrolytic manganese crystal double salt, and relates to the field of solid waste resource utilization. The method comprises the following steps: firstly, crushing the electrolytic manganese crystal double salt, dissolving the crushed electrolytic manganese crystal double salt in a reactor under set conditions, and adding aluminum salt and magnesium salt into a reaction system according to a set proportion to obtain a mixed solution; secondly, adding a set amount of water into a reactor, simultaneously adding alkali liquor and the mixed solution obtained in the first step into the reactor through a pump, controlling the pH value of the solution in the adding process, aging under set reaction conditions after the addition is finished, and carrying out solid-liquid separation after the aging is finished; and drying the obtained precipitate to obtain the magnesium-aluminum-manganese-based hydrotalcite-like adsorbent. The adsorbent can efficiently adsorb and remove low-concentration pollutants such as fluorine, phosphorus, cobalt and nickel in water. And finally, the filtrate obtained by solid-liquid separation can be separated to obtain an ammonium sulfate product after being evaporated and concentrated, and the evaporated liquor can be used for dissolving the next batch of electrolytic manganese crystal double salt. Compared with other electrolytic manganese crystal double salt recycling methods, the method has the advantages that the hydrotalcite-like adsorbing material is prepared through a directional regulation and control layered structure assembly process, high-value conversion of waste is achieved, the technical limitation that only element separation and low-added-value conversion are focused in traditional double salt recycling is broken through, and the method has the advantages of being low in cost, easy to operate and the like; and meanwhile, high-quality utilization of metals such as magnesium and manganese in the electrolytic manganese crystallization double salt can be realized, and the ammonium salt in the electrolytic manganese crystallization double salt can be prepared into a qualified ammonium sulfate product.

The invention relates to the technical field of metallurgy, in particular to a method for improving the leaching rate of clinker lithium. According to the leaching method, water washing is adopted in the immersion cleaning stage, acid washing is adopted in the leaching stage, under the condition that most lithium sulfate in the clinker can be leached out by water, insoluble lithium potassium sulfate double salt in the clinker is further dissolved through sulfuric acid leaching, and therefore the leaching rate of clinker lithium is increased. Wherein the dosage of the sulfuric acid can be determined according to an experimental formula, namely the total molar dosage of the sulfuric acid is 0.2 * molar weight of lithium in the clinker + 0.2 * molar weight of potassium in the clinker + 0.03 molar weight of sodium in the clinker. 10% dilute sulfuric acid is prepared according to the total molar weight of sulfuric acid to serve as leaching acid liquor, experiments confirm that the filtering performance of a filter cake is not obviously influenced when 10% acid is adopted as washing liquor, a good washing effect can be guaranteed, leaching liquor and the washing liquor are separated and purified respectively, and the treatment cost and loss of lithium in the solution can be reduced.

The invention discloses a reversible aqueous zinc-based electrolyte and a preparation method and application thereof, and belongs to the technical field of aqueous electrolytes. The invention discloses a preparation method of a reversible aqueous zinc-based electrolyte, which comprises the following steps: adding double salts into a mixed solvent, and uniformly stirring to obtain the reversible aqueous zinc-based electrolyte, wherein the double salt is a mixed salt of zinc trifluoromethanesulfonate and zinc acetate; the mixed solvent is a mixed solution of water and polyethylene glycol. When the reversible aqueous zinc-based electrolyte prepared by the method is applied to a zinc-copper battery, the technical problem that the stability and high discharge depth reversibility of a zinc metal anode are difficult to realize by the existing electrolyte is solved.

The invention relates to the technical field of water treatment, in particular to a method for recovering sylvite from sylvite-containing water. Potassium salt-containing water and a recrystallization agent are mixed and heated, the recrystallization agent reacts with potassium ions to generate new potassium-containing double salt crystals, the potassium-containing double salt crystals are ground and decomposed to obtain potassium salt crystals, and at least part of the potassium salt crystals are obtained by lattice distortion and chemical bond recombination of the potassium-containing double salt crystals; the sylvite comprises potassium chloride or potassium sulfate. Therefore, the problems of low recovery rate and low product purity of the existing sylvite recovery process are solved. The potassium salt is extracted by adopting a recrystallization method and a grinding decomposition method, so that potassium resources of salt lake chemical engineering, industrial potassium-containing mixed salt and industrial byproduct potassium salt-containing water can be effectively recovered, and an agricultural potassium fertilizer product is prepared.

The invention relates to a method for preparing aluminum sulfate from an iron-containing aluminum sulfate solution, and belongs to the technical field of inorganic chemical processes and industrial waste recycling. The method comprises the following steps: carrying out double salt reaction on an iron-containing aluminum sulfate solution and an ammonium source, crystallizing, and separating out aluminum ammonium sulfate double salt crystals and crystallization mother liquor; when the concentration of Fe < 3 + > in the iron-containing aluminum sulfate solution is greater than 0, firstly carrying out ferric iron reduction by adopting a reducing agent and then carrying out double salt reaction; at the starting moment of the double salt reaction, the molar ratio of total NH4 < + > in the solution to Al < 3 + > in the solution is (0.8-2): 1; and roasting the aluminum ammonium sulfate double salt crystal to remove ammonium to obtain aluminum sulfate and roasting gas. According to the method, an iron removal and crystallization separation process including reduction of ferric iron, addition of an ammonium source, double salt crystallization and roasting for ammonium removal is adopted, so that the content of key iron impurities in formed anhydrous aluminum sulfate crystals is lower than 0.01%.

The invention discloses a preparation method of modified ammonium perchlorate triethylene diamine perchloric acid double salt. According to the disclosed scheme, K < + > or NO3 <-> is doped in DAP-4, so that the sensitivity of DAP-4 is reduced, and the modified ammonium perchlorate triethylene diamine perchloric acid double salt is prepared. The doped perovskite energetic compound DAP-4 belongs to a heat-resistant explosive, and plays an important role in the fields of oil exploration and civil industry.

The application provides a high-impurity salt mine sediment void oil storage injection and production operation parameter optimization device and method, the device comprises a transparent heat-insulating pressure-resistant safety box, an acrylic salt cavity, an oil injection and production assembly, a brine injection and production assembly, an air compression assembly, a temperature regulation assembly and a sealing assembly, can simulate the whole process of sediment void oil storage injection and production of a salt cavity and a double salt cavity (U-shaped cavity) of a salt mine, can realize the whole process of injection and production of different sediment gradations, different oil injection / brine injection rates and pressures, and different ground temperature conditions, can obtain the oil injection and production rates and brine injection and production rates under different injection and production conditions and the sediment void oil storage recovery rate, can obtain the oil / brine / gas displacement micro-flowing conditions in the sediment void, so as to determine the sediment void oil storage volume and oil storage capacity of the salt mine, and establish the sediment oil storage injection and production operation adjustment parameters. The application can simulate the injection and production working conditions in the real underground salt cavity, realize the whole process control of the sediment void oil storage, and explore the feasibility of the oil production by gas injection.