58 results about "Alum" patented technology

The present invention relates to the technical field of mineral flotation, and in particular to a soft potassium magnesium alum flotation composite reagent and its application. The present invention provides a soft potassium magnesium alum flotation composite reagent, comprising a collector and a frother; the collector comprises R-C6H4NaO3S; R is an alkyl group. The soft potassium magnesium alum flotation composite reagent of the present invention has stronger adsorption selectivity and collection capacity. Under the same dosage, the soft potassium magnesium alum flotation composite reagent has a higher recovery rate and grade of the soft potassium magnesium alum concentrate obtained by flotation, thereby significantly improving the flotation separation efficiency of the soft potassium magnesium alum.

The invention relates to a preparation method of high-purity cesium carbonate, which comprises the following steps: by taking pollucite as a raw material, leaching with sulfuric acid, cooling and crystallizing to obtain crude cesium alum, recrystallizing to obtain high-purity cesium alum, adding at least one of cesium salt or cesium solution of which the cesium molar weight is greater than the aluminum molar weight in the production process in the recrystallization process, removing aluminum, converting, purifying and removing impurities, thereby obtaining the high-purity cesium carbonate. And carrying out evaporation concentration and carbonization crystallization to obtain high-purity cesium bicarbonate, and finally drying and decomposing to obtain a high-purity cesium carbonate product. Compared with a conventional method for preparing cesium carbonate through extracting cesium from pollucite and a conventional method for preparing high-purity cesium carbonate through an extraction method, the method has the advantages that the product purity is greatly improved, the content of cesium carbonate is larger than or equal to 99.999% wt in terms of Cs2CO3, the total amount of impurities including Li, Na, K, Rb, Ca, Mg, Al, Fe, SiO2 and heavy metal (in terms of Pb) is smaller than or equal to 0.001% wt, and especially the content of the same-main-group impurity Rb is smaller than or equal to 0.0001% wt.

The invention provides boehmite and a preparation method thereof, and the preparation method comprises the following steps: mixing ammonium alum, an alkaline additive and a solvent to obtain a mixed solution, and carrying out hydrothermal treatment on the obtained mixed solution to obtain boehmite. According to the preparation method provided by the invention, the ammonium alum is adopted as a raw material and is mixed with the alkaline additive and the solvent, and then hydrothermal treatment is performed to prepare the boehmite, so that the preparation cost is relatively low, and the boehmite is obtained through one-step reaction, and therefore, the preparation method has the advantage of simple preparation process; in addition, in the preparation method, one or more impurity removal processes do not need to be carried out on the ammonium alum, so that the preparation process is further simplified, and the preparation cost is reduced.

The invention relates to a corrosive agent and a corrosion method for displaying a 32CrNi3MoVE crystal boundary of alloy steel, which are characterized in that a common chemical product is used as an electrolytic corrosive agent after being simply proportioned, and the 32CrNi3MoVE steel quenched and tempered state original austenite crystal boundary is clearly displayed by a proper corrosion method. Chemical reagents used by the corrosive are economical and applicable, the corrosive is composed of alum, oxalic acid, dishwashing liquid, distilled water and the like which are existing in a laboratory, the proportioning of the corrosive is the key, the electrolytic corrosion method is simple to operate, alum can effectively display the grain boundary, oxalic acid provides a weak acid environment for oxidation reduction, and the corrosion effect is good. The dishwashing liquid slows down the corrosion rate of weak acid electrolyte to a metallographic specimen, weakens structure display, and improves the definition of crystal boundary display. The corroded sample is lightly polished in a polishing machine, and the corrosive agent ratio and the electrolytic corrosion method are combined to form an efficient novel corrosion method. The traditional corrosive agent capable of completely replacing saturated picric acid and a proper amount of detergent and the corrosion method effectively solve the problem of 32CrNi 3MoVE steel quenched and tempered state original austenite grain boundary display.

The invention belongs to the technical field of waste residue recycling, and provides a resourceful treatment method of a lithium-containing material. By means of leaching, metal (Al, K, Na, Cs, Rb, Li, Ca, Mg, Fe, Tl and other heavy metal) in the lithium-containing material can be leached out, and harmlessness of the lithium-containing material is achieved; the brine rich in metal salt is oxidized to remove iron and thallium, so that iron, thallium and other heavy metals in the brine can be fixed and removed in a hydroxide form; cooling crystallization is carried out, so that alkali metal ions and aluminum in the brine can be fixed and removed in the form of aluminum sulfate alum salt; the carbonate precipitation can fix and remove metal ions such as aluminum, calcium and magnesium in the brine in the form of carbonate; magnesium and calcium in the brine can be fixed and removed in the form of calcium-magnesium mud through impurity removal; after evaporation and concentration, recovery of lithium carbonate is realized, and recovery of sodium sulfate is realized through evaporation and crystallization. According to the resourceful treatment method, valuable metal in the lithium-containing material is recycled, and harmless treatment is achieved.

The invention discloses a method for recovering iron resources from jarosite, which comprises the following steps: S1, reacting ammonium oxalate with jarosite to realize jarosite phase dissolution: mixing jarosite with ammonium oxalate, and heating and reacting in a water reaction system to generate ammonia gas to obtain leached residues and leached liquid; s2, the leachate reacts with ammonia to precipitate and separate iron, and ammonium oxalate is recycled: S2.1, the leachate reacts with the ammonia: ammonia gas is introduced into the leachate or ammonia water is added into the leachate for full reaction, and reaction product slurry containing ferric hydroxide precipitate and ammonium oxalate is obtained; and S2.2, separating ferric hydroxide and ammonium oxalate from the reaction product slurry: filtering and separating to obtain a ferric hydroxide precipitate, and cooling to separate out crystals from ammonium oxalate in the filtrate so as to recover ammonium oxalate. According to the method, ammonium oxalate used for replacing iron in the iron vitriol can be recycled, the raw material cost is low, iron element separation and utilization are achieved, solid waste is remarkably reduced, and enrichment of other valuable elements in the iron vitriol is facilitated.

The invention discloses a method for efficiently recovering resources from brown corundum ash, which comprises the following steps: step 1, carrying out BCFA magnetic separation to remove iron, mixing and stirring according to a solid-to-liquid ratio of 1: 5, enabling the solution to flow through a magnetic rod, repeating for three times to remove most metal iron in the solution, and enriching fine-fraction ash powder by wind classification; according to the method, BCFA ash is mixed and stirred according to the solid-to-liquid ratio of 1: 5, the solution flows through a magnetic rod and is repeated for three times, most of metal iron in the solution is removed, iron is recycled in the solution, then gallium is adsorbed to the alkaline metal solution through alkaline resin, the gallium is separated from other metals, and the BCFA ash is obtained. And further separating to obtain metal aluminum when the metal aluminum has a precipitation effect when the pH value is 13, so that iron powder is obtained firstly, alum is recycled under an acidic condition, gallium white carbon black and aluminum are recycled under an alkaline condition, and multi-stage utilization of products is realized.

The invention relates to the technical field of chemical production, and provides a gypsum-based inorganic cementing material and a preparation method and application thereof.The gypsum-based inorganic cementing material is prepared from, by mass, 30%-50% of anhydrous gypsum, 20%-30% of semi-hydrated gypsum, 5%-10% of quick lime and 5%-30% of aluminum sulfate or alums, and the sum of the mass percentages of all the components is 100%. Calcium formate or calcium nitrate accounts for 5-10%, copperas accounts for 0-10%, and sodium metaaluminate accounts for 0-10%. According to the gypsum-based inorganic cementing material as well as the preparation method and the application thereof provided by the technical scheme, the core technical bottleneck of environmental problems caused by massive stockpiling of industrial byproduct gypsum and poor water resistance of products is effectively solved, and high-added-value resource utilization of the industrial byproduct gypsum is realized.

The invention provides a method for extracting rubidium and cesium from mixed salt or solution containing rubidium and cesium, which comprises the following steps: S1, providing a raw material, and purifying an ionic solution containing rubidium and cesium to obtain a solution containing rubidium and cesium; s2, aluminum sulfate and sulfuric acid are added into the solution containing rubidium and cesium for preferential crystallization of cesium, and a first batch of aluminum alum crystals and a first mother solution are obtained; s3, dissolving and purifying the first batch of alumen crystals to obtain high-purity cesium salt; s4, sequentially carrying out evaporation concentration and crystallization separation on the first mother liquor to obtain a second batch of alumen crystals and a second mother liquor; and S5, fusing and purifying the second batch of alumen crystals to obtain high-purity rubidium salt, and returning the second mother liquor to the step S1 for recycling, and the method has the effects of high extraction recovery rate and low cost.

The invention discloses a single-component paint mist coagulant and a preparation method thereof, and the single-component paint mist coagulant is prepared from the following raw materials in percentage by mass: 5%-10% of alum, 1%-2% of attapulgite, 0.3%-0.8% of cationic polyacrylamide, 0.5%-1% of methacryloyloxyethyl trimethyl ammonium chloride and the balance of water. When the single-component paint mist coagulant is adopted for wastewater treatment, only the pH value of sewage needs to be adjusted to 7.5 or above, then the single-component paint mist coagulant disclosed by the embodiment of the first aspect of the application is directly added, and paint slag floating can be realized through aeration or violent stirring, so that the whole wastewater treatment process is simple, the labor intensity is low, the production cost is low, and the method is suitable for industrial production. And meanwhile, the device can be matched with a pH detector to realize automatic operation, so that the working efficiency is improved.

The invention discloses a method for extracting metal salts and metals from polymetallic ores or polymetallic materials. The method comprises the following steps: 1) raw material pretreatment: crushing and grinding raw materials into particles; 2) full-wet dissolution extraction: leaching corresponding acid, a corresponding oxidant, a corresponding catalyst and water from the product obtained in the step 1) by using the required metal, stirring and heating to boiling until the required metal in the raw materials is dissolved in the liquid; (3) carrying out solid-liquid separation on the leached product in the previous step, and carrying out mother liquor cooling on the mother liquor subjected to the solid-liquid separation to separate metal elements which can be subjected to alum formation and metal elements which cannot be subjected to alum formation; and (4) sequentially separating out salts of metal elements capable of forming vitriol from the metals capable of forming vitriol according to a sequence from strong vitriol forming capability to weak vitriol forming capability of the metals. The problems that in the prior art, cost is high, and pollution to the environment is large are solved.

The present disclosure is directed to apparatus and method for more efficiently and effectively refining alum process residue into commercially useable compounds. Materials that contain aluminum or aluminum oxide are provided to a vessel where a chemical rection is controlled when a product is made. Materials that include aluminum can be provided to the vessel and acid can also be provided to the vessel to initiate a chemical reaction. Masses of respective materials provided to the vessel can be controlled according to a regimen for making a product. Temperatures of the vessel can be monitored and controlled while the reaction occurs. Activated carbon may be added to the vessel to help the product performance and stability. Once the product is formed, it is output from the vessel and cooled. The product can be subsequently processed using techniques such as grinding and screening when a final product is prepared.

The application discloses a short-process lithium extraction method of lithium clay ore, and belongs to the technical field of lithium extraction. 3+ The main component of the alunite formed in the form of alum is XAl3(SO4)2(OH)2 (X is Na or K). The alunite is insoluble in water and slightly soluble in sulfuric acid, has good crystallinity, and has less adsorption and entrainment of free ions, and almost no entrainment of lithium. The application fully utilizes the characteristics of the alunite, converts Al 3+ into alunite precipitation which is dissolved from the lithium ore by acid, reduces the Al / Li ratio of the leaching solution, and finally collects lithium in the form of lithium carbonate by using the calcium-magnesium resin to adsorb a small amount of calcium and magnesium ions.

The invention relates to the field of wind energy map data processing, in particular to an admixture for tower drum concrete and a preparation method and application thereof.The admixture is prepared from, by weight, 10-15 parts of silica fume, 15-30 parts of microbeads, 15-25 parts of superfine slag powder, 15-25 parts of fly ash, 5-7 parts of structural self-waterproofing agent and 1-3 parts of shrinkage reducing agent; the structural self-waterproofing agent is selected from at least one of xerogel, a modified expanding agent, fluosilicate, zeolite powder, sodium gluconate, sodium pyrophosphate and sodium dodecyl sulfate; the shrinkage reducing agent is a polyacrylate emulsion, the polyacrylate emulsion comprises an acrylate monomer and a modifier, and the modifier comprises at least one of polyethylene glycol, propylene glycol, nano silicon dioxide, glycerol, sodium silicate and alum. The problems of hydration heat control and appearance improvement can be solved at the same time.

The invention relates to the technical field of metallurgical solid waste treatment and comprehensive utilization of resources, in particular to a coprecipitation process for all-component high-value utilization of silicomanganese metallurgical fly ash, which comprises the following steps: washing the fly ash by using 20% + / -5% dilute sulfuric acid, adjusting the concentration of a sulfate solution to coprecipitate calcium magnesium alum, adding manganese powder for replacement, and crystallizing at high temperature to obtain manganese sulfate; potassium sulfate, sodium chloride and the like are byproducts. According to the technology, the high raw material recovery rate is achieved through the multi-stage countercurrent leaching and coupling selective precipitation technology, the purity of battery-grade manganese sulfate is larger than or equal to 99.5%, and meanwhile the low-aluminum requirement of the silicon fertilizer raw material is met. The process is efficient and environment-friendly, and the resource utilization rate and economic benefits are remarkably improved.

The invention relates to the technical field of acid-making tail gas treatment and leaching systems of zinc hydrometallurgy, and discloses a zinc hydrometallurgy acid-making tail gas desulfurized liquid recycling method which comprises the following steps: performing two-stage absorption desulfurization on acid-making tail gas by using a sodium hydroxide solution to generate sodium nitrite absorption liquid; carrying out aeration oxidation on the sodium nitrite absorption liquid to obtain oxidized liquid mainly containing sodium sulfate; the oxidized liquid is sent to a leaching process to wash zinc-containing filter residues; and finally, returning the slag washing liquid to the alum precipitation process, so that sodium ions in the slag washing liquid are utilized as a alum precipitation agent. The two-stage sodium hydroxide desulfurization process is adopted, the desulfurization efficiency is high, meanwhile, the sodium nitrite absorption liquid generated through desulfurization is completely oxidized and reused in the production process, external discharge of the wastewater is thoroughly eliminated, zero discharge of the desulfurized liquid is achieved from the source, and the pressure of tail-end sewage treatment of enterprises and the environmental protection risk are greatly relieved.

The present application relates to the technical field of coagulant aid, and discloses a tailing dewatering coagulant aid as well as a preparation method and application thereof.The tailing dewatering coagulant aid comprises the following components in parts by weight: corn cob extract 90-110 parts; polyacrylamide 9-11 parts; acetaldehyde 3-5 parts; ethylene oxide 3-5 parts; potassium hydroxide 1-3 parts; methanol 1-3 parts; magnesium chloride 1-3 parts; yeast 0.5-1 part; alum 1-3 parts; activated carbon 3-5 parts; and water 50-60 parts.The present application uses corn cob of natural plant corn as the main raw material, and uses the coagulant aid with corn cob extract as the main component to capture the suspended particles in the coal mine tailing slurry, so that the turbidity removal rate is high; the formed coagulum has a large volume, fast settling and high coagulation efficiency; the unit coagulant aid demand usage amount increases limitedly, but the unit demand amount of inorganic substances and organic compounds in the coagulant aid is greatly reduced, and the present application is more environmentally friendly and safe.

A method for preparing potassium magnesium alum by using underground primary sulfur-rich potassium-containing minerals in a high-temperature state comprises the following steps: S1, performing multi-stage crushing on raw ores to obtain the sulfur-rich potassium-containing minerals; s2, sulfur-rich potassium-containing minerals and seawater are mixed and then stirred, the stirring time is 40-150 min, the conversion temperature is controlled to be 35-50 DEG C, and solid-liquid mixed ore pulp is obtained; s3, the solid-liquid mixed ore pulp is subjected to pulp mixing with a potassium magnesium alum flotation mother solution to control the flotation concentration, flotation is conducted after a flotation reagent is added and mixed to be uniform, the dosage of the flotation reagent is 250-500 g / ton raw ore, and the flotation reagent is an organic sodium salt aqueous solution generated after heavy oil is subjected to chlorination, sulfonation and saponification; and S4, flotation froth obtained in flotation is filtered and separated, solids are potassium magnesium alum concentrates, after tailings are concentrated, obtained high-concentration tailings are discharged, and flotation mother liquor generated through flotation filtration or concentration is partially returned to the step S3 to be used for size mixing. The method is simple in process and good in product quality.

The present invention discloses a method and application for organic enhanced stabilization of arsenic in arsenic ferrocyanide, which belongs to the field of wastewater treatment technology. The method comprises the following steps: adding an organic solution containing carboxyl groups to arsenic (III)-containing wastewater, adding a sulfate solution of appropriate concentration, adjusting the pH to less than 3, and then slowly adding a solution containing trivalent iron salt, wherein Fe 3+ ∶As 3+ ∶SO4 2‑ The ratio of arsenic to ferrous iron is 1.5:1:0.25, and the pH value is kept constant during the injection process; the mixture is heated and stirred to a temperature of 25-65°C, reacted for a period of time, and after the reaction is completed, the precipitate is separated. The present invention accelerates the mineralization rate through the strong complexation between organic matter and trivalent iron, achieving a trivalent arsenic removal rate of over 95%. The resulting arsenic nitrite has low leaching toxicity, controlling the leaching toxicity to below 5 mg / L for the first time. The process is simple, and the residual arsenic concentration in wastewater is reduced by approximately 50%, with broad prospects for practical application.

A method is described for controlling the amount of aluminium in a sulphate-based aluminium containing matrix, the method comprising adding ammonium sulphate in stochiometric ratio of from about 0.1: 1 to greater than 1: 1 to the aluminium sulphate concentration of the sulphate-based aluminium containing matrix to form ammonia alum, and separating the ammonia alum.

The embodiment of the present application provides a method for recovering copper and aluminum from copper-coated aluminum processing waste, and relates to the technical field of hydrometallurgy. The method comprises the following steps: using an electrolytic cell provided with an anion exchange membrane, the anion exchange membrane separates the electrolytic cell into an anode area and a cathode area; placing the copper-coated aluminum processing waste as an anode in the anode area and a cathode in the cathode area; filling the anode area with an anolyte containing sulfuric acid and an alkali metal sulfate, the alkali metal being potassium, rubidium or cesium; filling the cathode area with a catholyte containing sulfuric acid and copper sulfate; electrolyzing under power, depositing metallic copper at the cathode, generating alum precipitate in the anode area, and recovering the metallic copper and the alum precipitate respectively. The method for recovering copper and aluminum from copper-coated aluminum processing waste in the embodiment of the present application electrolyzes the copper-coated aluminum processing waste by electrolysis, the copper in the waste is preferentially dissolved, the exposed aluminum is synchronously dissolved and immediately combined with alkali metal ions and sulfate radicals in situ to generate alum precipitate, thereby realizing efficient and complete separation of copper and aluminum components.

The invention relates to the technical field of food processing, and discloses alum-free composite vermicelli and a preparation method thereof.The composite vermicelli is prepared from, by mass, 75-95 parts of sweet potato powder, 10-20 parts of potato powder, 3-5 parts of corn starch, 2-4 parts of polysaccharide composition, 0.03-0.05 part of vegetable gum composition, 0.05-0.1 part of composite salt, 0.2-0.3 part of protein and water. The preparation process without addition of alum is adopted, the situation that ingestion of aluminum elements in traditional vermicelli is harmless to human health is avoided, the composite vermicelli prepared from multiple raw materials adopts the two-stage water adding gelatinization and aging treatment process, the proportion is scientific, the elasticity and toughness of the vermicelli are improved, the good taste is kept, the vermicelli is more smooth, boil-proof and not prone to breakage, and the vermicelli is suitable for being eaten by people. The dried bean curd is rich in nutrition, tough and chewy in taste, suitable for large-scale industrial production and capable of meeting the requirements of consumers for healthy food.

The present application relates to a kind of vanadium electrolyte based on acidic vanadium-rich liquid and its preparation method.The technical scheme is: in acidic vanadium-rich liquid, ammonium sulfate or ammonia is added, low-temperature ammonium alum crystallization is carried out to remove aluminum, and clear liquid is obtained after solid-liquid separation;After adding reducing agent to the clear liquid, the pH value is adjusted to 0.5-1.5, and the original liquid is obtained;The original liquid is extracted with saponified organic phosphonic acid extractant, and the loaded organic phase is washed with dilute acid and then back-extracted with sulfuric acid;The back-extracted liquid obtained by back-extraction is deoiled to obtain vanadium electrolyte.The present application has low preparation cost, is environment-friendly, has low extraction pH value and wide technical adaptability, the prepared vanadium electrolyte product has high concentration and high battery efficiency, effectively realizes the separation of impurities and the enrichment of vanadium in acidic vanadium-rich liquid.

The invention provides a method for enriching and separating titanium, vanadium and chromium from titanium white waste acid, which comprises the following steps: mixing an alkaline substance containing calcium and / or magnesium with the titanium white waste acid to carry out acid-base neutralization reaction, reducing the acidity of the titanium white waste acid to precipitate titanium, vanadium and chromium, and carrying out reverse dissolution and precipitation by using sulfuric acid to obtain filtrate containing titanium, vanadium and chromium; freezing and filtering the filtrate containing titanium, vanadium and chromium to respectively obtain an aluminum ammonium sulfate crystal and the filtrate containing titanium, vanadium and chromium; then, the filtrate containing titanium, vanadium and chromium is diluted and hydrolyzed, the pH is adjusted, titanyl sulfate is hydrolyzed, sulfate of vanadium and chromium is not hydrolyzed, and metatitanic acid slurry and a diluted solution containing vanadium and chromium are obtained through separation; then neutralizing and filtering the vanadium-chromium-containing diluted solution to obtain a vanadium-chromium-containing filter cake; and then, the vanadium-chromium-containing filter cake is extracted and separated, and a chromium-containing product and a vanadium-containing product are obtained correspondingly. According to the method, high-value substances such as titanium, vanadium and chromium can be gradually separated and recovered, the problem that the high-value substances are difficult to separate and recover is solved, the enrichment and separation efficiency is improved, and the recovery and separation cost is reduced.

The application discloses a kind of based on non-complex state manganese oxidation technology's reclaimed water preparation method, it is related to reclaimed water preparation technical field, including following material: phosphate buffer, potassium permanganate, ferrous sulfide, modified chitosan, modified polyaspartic acid, glutamic acid diacetic acid tetrasodium;The application maintains water quality alkaline environment by adding phosphate buffer, greatly inhibits the risk of toxic gas generated by ferrous sulfide hydrolysis, guarantees the safety of preparation process;The modified chitosan added, by electric neutralization and adsorption bridging, small precipitate is quickly flocculated into sedimentable alum flower, realizes mud-water separation;By adding modified polyaspartic acid, can prevent the scale formed by precipitation in irrigation pipeline or equipment, and glutamic acid diacetic acid tetrasodium synergistic effect, jointly ensure the chemical stability of reclaimed water in storage and conveying process, protect irrigation system, water quality long-term stability.

The invention relates to high-purity cesium carbonate, the content of the cesium carbonate is greater than or equal to 99.999% wt in terms of Cs2CO3, and the total content of impurities Li, Na, K, Rb, Ca, Mg, Al, Fe, SiO2 and heavy metal (in terms of Pb) is less than or equal to 0.001% wt. The preparation method of the high-purity cesium carbonate comprises the following steps: leaching pollucite serving as a raw material with sulfuric acid, crystallizing and recrystallizing a leaching solution to obtain high-purity cesium alum, and adding at least one of cesium chloride, cesium sulfate and cesium nitrate during recrystallization and dissolution of cesium vanadium; and removing aluminum, converting, purifying and removing impurities to obtain a high-purity cesium carbonate solution, evaporating, concentrating, carbonizing and crystallizing to obtain high-purity cesium bicarbonate, and finally drying and decomposing to obtain the high-purity cesium carbonate. Compared with a conventional method for preparing cesium carbonate by extracting cesium from pollucite and a conventional method for preparing high-purity cesium carbonate by extracting cesium from pollucite, the method has the advantages that the product purity is greatly improved, and particularly, the impurity Rb of the same family is less than or equal to 0.0001% wt.

This invention discloses a method for producing high-purity cesium phosphate using mother liquor after lithium extraction from lepidolite. The method utilizes the waste liquid generated after lithium extraction from lepidolite as raw material, and adds auxiliary materials such as acidifying reagents and aluminum precipitation and desulfurization reagents. Through processes including precipitation of sodium-potassium mixed salt, acidification precipitation of alum, recrystallization purification, aluminum precipitation and desulfurization, concentration crystallization, and centrifugal drying, high-purity cesium phosphate is produced with a product purity exceeding 99.9%. This method has a wide availability of raw materials, high energy utilization rate, simple and feasible process, low equipment investment, low cost, short production cycle, high efficiency, and does not generate new waste, making it environmentally friendly. It effectively realizes the comprehensive reuse of lithium precipitation mother liquor, improves the economic value of lepidolite, reduces the production cost of lithium extraction from ore, saves cesium resources, and reduces waste liquid pollution. It can be widely applied to the industrial production of lithium extraction from lepidolite.

The invention discloses a preparation method and application of a vanadium electrolyte, and the preparation method comprises the following steps: S1, adding a sulfuric acid solution into a mixture containing a V2O5 solid, elemental sulfur and an adsorption material, and carrying out heating reaction, sulfur removal and filtration to obtain a high-purity hydrated alum sulfate solid; and S2, the high-purity hydrated vitriol sulfate solid in the step S1 is dissolved in a dilute acid solution, electrolysis is conducted, and the vanadium electrolyte is obtained. According to the preparation method, preparation of the solid vanadium sulfate hydrate can be achieved, the electrolyte for the all-vanadium redox flow battery is prepared through electrolysis on the basis, the preparation method is easy and convenient to operate and rapid in reaction, the prepared electrolyte is high in purity and few in impurity ions, the preparation time is greatly shortened, and the obtained electrolyte can meet the application requirements of current vanadium batteries.

The invention relates to a method for pressure reduction leaching of zinc leaching residues, and belongs to the technical field of zinc hydrometallurgy. According to the technical scheme, the method comprises the steps that S1, acid liquor is added into a mixed material of zinc leaching residues and zinc concentrate for first pressure leaching, compressed air is introduced into the acid liquor and the mixed material, so that hydrogen sulfide gas is prevented from being generated, and the content of Fe < 3 + > in first leaching liquor is controlled; and S2, acid liquor is added into the first pressurized underflow to be subjected to second pressurized leaching, oxygen is introduced into the acid liquor and the first pressurized leaching underflow, and the temperature and final acidification are controlled to prevent lead-iron-vitriol from being generated. When Fe < 3 + > is reduced, the amount of sulfuric acid in the system is not increased, the reaction time is short, the energy consumption is low, the leaching rate of zinc, iron and copper is high, and the lead-silver-sulfur slag rate is low.

The invention discloses an ardealite purification and innocent treatment method and application, and particularly relates to the technical field of ardealite treatment.The ardealite purification and innocent treatment method comprises the following steps that ardealite is screened in a classified mode through a double-layer vibrating screen, mechanical impurities with the particle size larger than 100 micrometers are removed, 5-100-micrometer undersize materials are collected and ground through an airflow mill till the specific surface area is larger than or equal to 200 m < 2 > / kg, and pretreated ardealite is obtained. A multi-stage purification system is realized through ultrasonic and ozone synergistic washing in combination with alum sludge modified zeolite adsorption and membrane separation interception, an impurity adsorption layer on the surface of ardealite can be effectively destroyed by an ultrasonic cavitation effect, organic pollutants can be effectively decomposed by ozone oxidation, and phosphorus, fluorine ions and iron-series impurities are accurately captured by an adsorbent, so that the purification efficiency is improved. Residual pollutants are deeply intercepted by a membrane system, finally, the removal rate of phosphorus and the removal rate of fluorine both exceed 95%, toxic and harmful impurities in the phosphogypsum are effectively removed, and purification and harmless treatment of the phosphogypsum are efficiently achieved.