247 results about "Pregnant leach solution" patented technology

The present disclosure provides a vanadium electrolyte, a preparation method and use thereof. The method includes: adding sulfuric acid into vanadium-containing ore, and stirring to obtain a mixture; curing the mixture to obtain a clinker; leaching the clinker with water to obtain a vanadium-containing leaching solution; adding a first impurity-removing agent into the vanadium-containing leaching solution to obtain a first purified solution; adding an oxidizing agent, a ferric phosphate dihydrate seed crystal and a second impurity-removing agent into the first purified solution to obtain a second purified solution; adding a reducing agent and a flocculating agent into the second purified solution, and filtering a resultant solution to obtain a filtered solution; mixing the filtered solution with an extraction liquid to obtain a vanadium-supported organic phase; stripping the vanadium-supported organic phase to obtain a stripping liquid; and removing an organic phase from the stripping liquid to obtain the vanadium electrolyte.

The application provides a method for reconstructing a positive electrode precursor from waste ternary positive electrode materials, and a positive electrode precursor. The method comprises the following steps: acid leaching of the waste ternary positive electrode materials to prepare a leaching solution; co-extraction treatment of the leaching solution with an extractant to prepare an organic loaded solution; mixing of the organic loaded solution and a stabilizing solution to prepare a dispersion solution, wherein the stabilizing solution comprises a surfactant and water, and the surfactant comprises a non-ionic surfactant and a cationic surfactant; introduction of a precipitant, a complexing agent and the dispersion solution into a reaction bottom solution, control of the pH of the reaction system to be 10.5-12, co-precipitation treatment, and obtaining of a co-precipitation system; solid-liquid separation of the co-precipitation system to obtain a solid-phase precursor; and washing of the solid-phase precursor to prepare the positive electrode precursor. Through the above method, the positive electrode precursor with excellent sphericity and high tap density can be obtained in situ.

The application provides a method for separating selenium tellurium from high-selenium tellurium dioxide through multistage conversion, and belongs to the technical field of non-ferrous metallurgy. The method comprises the following steps: a, material preparation; b, primary conversion leaching: selectively reducing selenium in a solution containing a reducing agent at pH 8-11 to obtain a selenium tellurium-containing residue and a primary leaching solution; c, secondary conversion leaching: selectively leaching tellurium in a strong alkaline solution containing a reducing agent to obtain elemental selenium and a secondary leaching solution; and d, neutralization treatment: combining the two leaching solutions and adding acid to obtain high-purity tellurium dioxide. The method is simple to operate, short in production cycle, and realizes efficient separation of selenium tellurium. The purity of the obtained elemental selenium is greater than or equal to 95%, the purity of the obtained tellurium dioxide meets the requirements of electrodeposition for producing 4N tellurium, and the method is suitable for large-scale production.

The application discloses a method and a reaction device for synchronously and efficiently removing iron and organic matters, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: taking a leaching solution of a zinc hydrometallurgy purification process, adjusting the pH by using a neutralizing agent a, maintaining the pH between 3.6-4.0, then conveying the solution to a leaching solution storage tank for preheating and stirring, after reaching a set temperature of 50-95 DEG C, injecting the solution into an iron removal reactor, adjusting the pH to be 4.0-5.0, introducing an oxidizing agent, controlling the flow rate to be 10-300 L / h, deeply removing the organic matters and iron ions in the solution, and after the reaction is finished, aging for 1-4 h, and then performing solid-liquid separation. The reaction device comprises a leaching solution storage tank, an iron removal reactor, an oxidizing agent supply system and the like. The application can efficiently and synchronously remove the iron ions and the organic matters in the solution, can greatly reduce the iron removal time, can reduce the catalyst and oxidizing agent consumption, has a good removal effect, and has a good application prospect.

The subject invention provides safe, environmentally-friendly compositions and efficient methods for extracting impurities from gold ore. More specifically, the subject invention provides compositions derived from microorganisms for pre-leaching treatments of gold ore, which can be used for reducing carbonaceous material in gold ore.

The application discloses a method for preparing vanadium electrolyte from vanadium-containing shale through a short process, and comprises the following steps: crushing, grinding and slurry preparation of vanadium-containing shale to obtain ore slurry; flotation of the ore slurry to obtain flotation concentrate; concentration of the flotation concentrate, sulfuric acid aging and water leaching to obtain vanadium-containing leaching solution; removal of aluminum from the vanadium-containing leaching solution to obtain post-aluminum-removal solution; neutralization and reduction pretreatment of the post-aluminum-removal solution to obtain post-pretreatment solution; one-stage extraction of the post-pretreatment solution to obtain vanadium-rich solution I; two-stage extraction of the vanadium-rich solution I to obtain vanadium-rich solution II; and oil removal treatment of the vanadium-rich solution II to obtain vanadium electrolyte. The method realizes efficient extraction of vanadium from multi-metal vanadium-containing shale through flotation and sulfuric acid aging and water leaching, directly uses the vanadium-containing leaching solution as raw material, and prepares vanadium electrolyte through neutralization and reduction pretreatment, one-stage extraction, two-stage extraction and oil removal process. The method has the characteristics of short process, low cost, environmental friendliness, strong adaptability of raw materials, less reagents and energy consumption, etc.

A method of recovering a nickel, cobalt, and manganese salts includes removing impurities from an acidic aqueous leach solution including cobalt, manganese, and nickel salts to produce a purified aqueous solution including the metal salts and remaining impurity salts. The method includes extracting the purified aqueous solution in a first liquid-liquid extraction step using a first organic extractant to produce a first aqueous raffinate solution including the cobalt, manganese, and nickel salts and a first loaded organic solution including one or more of the remaining impurity salts from the purified aqueous solution. The method further includes extracting the cobalt, manganese, and nickel salts from the first aqueous raffinate solution in a second liquid-liquid extraction step using a second organic extractant to produce a second loaded organic solution including the cobalt, manganese and nickel salts and a second aqueous raffinate solution comprising one or more of the remaining impurity salts.

The application discloses a gold leaching method for pyrite-containing gold ore, and comprises the following steps: after the pyrite-containing gold ore is finely ground, water is added to obtain a slurry; a gold leaching reagent solution is added into the slurry to obtain a mixed leaching solution; the pH value of the mixed leaching solution is adjusted to alkaline, and leaching treatment is performed; and after filtration, a gold-containing leaching solution is obtained; the gold leaching reagent solution comprises polyphosphate, copper salt and thiosulfate; in the gold leaching reagent, polyphosphate is added; under alkaline conditions, polyphosphate ions can be selectively adsorbed or complexed on the surface active sites of pyrite to form a physical or chemical masking layer, thereby effectively blocking the direct contact of pyrite with dissolved oxygen and thiosulfate in the solution, inhibiting the catalytic decomposition of pyrite, significantly reducing the invalid consumption of thiosulfate, stabilizing the pH value and potential of the leaching system, and guaranteeing the efficient leaching of gold.

This invention belongs to the technical field of rare metal extraction, specifically relating to a method for defluorinating rare earth ore leaching solutions. The steps are as follows: S1, adding ammonium bicarbonate to the rare earth ore leaching solution, clarifying, and then separating the solid and liquid to obtain filtrate A and filter residue A; S2, adding ammonium bicarbonate to filtrate A, separating the solid and liquid to obtain filtrate B and filter residue B; S3, adding concentrated sulfuric acid to filter residue A, adding filtrate B from step S2, separating the solid and liquid to obtain filtrate C and filter residue C; S4, adding oxalic acid solution to filtrate C, stirring and reacting, clarifying, and then filtering to obtain filtrate D and filter residue D; S5, adding calcium or magnesium salts to filtrate D, separating the solid and liquid to obtain CaF2 or MgF2 filter residue and filtrate E; S6, mixing filtrate B and filtrate E, recovering and continuing to use for leaching rare earth ore, with filter residue B and filter residue D being the defluorinated rare earth products. This method can eliminate fluoride ions at the source, improving the subsequent rare earth metal extraction rate and quality.

This application relates to the field of heap leaching simulation devices, and more particularly to a heap leaching simulation device for efficient separation of impurities in phosphogypsum. The technical solution includes a modular heap leaching column, multi-layer independently controlled spray support components, a liquid supply system, a liquid return system, and a control unit. Each layer within the heap leaching column is equipped with independently operable spray components. The control unit can sequentially activate different spray levels from top to bottom or bottom to top, and return the leachate collected at the bottom to the top for re-rinsing. By having each layer of phosphogypsum sequentially act as the top, middle, and bottom layers in the circulation, the leachate repeatedly passes through multiple layers of phosphogypsum in various sequences, effectively eliminating the concentration gradient formed by the consumption of effective components and the accumulation of impurities during traditional drip leaching, achieving balanced impurity removal from each layer of phosphogypsum. This invention has advantages such as uniform impurity removal, high reagent utilization, and flexible operation, and is suitable for simulation research of phosphogypsum heap leaching impurity removal processes.

A method for recycling catalytic metals comprising: collecting a plurality of spent catalytic metals, wherein the spent catalytic metals contain cathodes of NMC111, NMC622, NMC811, NCA, LCoO2, LiNi0.5Mn1.5O4, LiMnO4, LiNiO2, LiMn2O4, and / or LiMnO2 compositions; subjecting the plurality of spent catalytic metals to a green mixture, wherein the green mixture includes dihydrogen phosphite and water, phosphoric acid and water, sulfuric acid and water, hydrogen chloride and water, or nitric acid and water, at temperatures of between 80 and 120° C. to form a metal leachate solution; and recovering lithium (Li) from the metal leachate solution.

A comprehensive utilization method for valuable elements in hydrometallurgical slag of laterite nickel ore, comprising the following steps: S1. placing an iron-aluminum slag produced by laterite nickel ore hydrometallurgy in a tube furnace, and introducing an HCl gas stream for a one-stage distillation at 185-290° C. to obtain a one-stage distillation tail gas and a one-stage distillation residue; and condensing the one-stage distillation tail gas to obtain anhydrous AlCl3; S2. introducing an HCl gas stream to the one-stage distillation residue for a two-stage distillation at 320-500° C. to obtain a two-stage distillation tail gas and a two-stage distillation residue; and condensing the two-stage distillation tail gas to obtain anhydrous FeCl3; S3. subjecting the two-stage distillation residue to a leaching treatment by using a leaching solution to obtain a leaching residue and a leaching solution; subjecting the leaching solution to a scandium precipitation treatment to obtain a scandium precipitate and a de-scandiumed liquid; S4. adjusting the pH value of the de-scandiumed liquid to obtain an MHP. The obtained aluminum, iron, and scandium products have high purity and high recovery.

This invention discloses a method for recovering rare earth elements from industrial solid waste fluorogypsum, belonging to the field of industrial solid waste treatment technology. The technical solution includes the following steps: 1) Pretreatment of solid waste fluorogypsum: fluorogypsum is screened, crushed, and then fed into a raw material tank; 2) Leaching of rare earth elements: ammonium sulfate solution is added to the raw material tank for soaking, followed by solid-liquid separation to obtain leachate and water-leached residue. The water-leached residue undergoes secondary solid-liquid separation to obtain waste residue and filtrate one; 3) Separation of precipitates containing rare earth elements: a precipitant is added to the leachate for reaction to obtain mixed slurry one. Mixed slurry one undergoes solid-liquid separation to obtain precipitates containing rare earth elements and filtrate two; 4) Filtrate recycling: filtrate one and filtrate two are mixed to obtain a mixed solution, which is then treated with water and recycled. This invention uses a milder ammonium sulfate solution to treat waste fluorogypsum fine powder, greatly saving production costs while avoiding toxic gas emissions and air pollution problems.

The application discloses a kind of short process gold extraction devices of waste printed circuit board.It includes separation module, collection module and electrodeposition part.Separation module contains leaching tank, and leaching liquid and cleaning liquid are alternately introduced, and leaching process is strengthened using micro-bubble generator and heater, so that gold foil is stripped from the surface of circuit board;Collection module contains filter and temporary storage tank, for intercepting and collecting gold foil and classifying temporary storage liquid;Electrodeposition part is connected to temporary storage tank, and copper in leaching solution is recovered through electrodeposition tank, and tail liquid flows back to leaching tank to realize closed circuit circulation.The application adopts integrated design, and combines selective leaching and physical interception by micro-bubble strengthening, without complex high-temperature or cyanide equipment, and one step realizes efficient stripping of gold and electrolytic recovery of copper;At the same time, leaching solution is closed circuit, and cleaning liquid is recovered in stages, which significantly shortens the process flow, reduces equipment investment and environmental pollution.

This process for the recovery of rare earths contained in ionic clays implements the leaching of said clays according to a continuous loop: in which said leaching is initiated by contacting fresh ionic clay with an aqueous leaching solution S1 comprising a dissolved salt of M1 / zCl or M2 / zSO4, where M is a cation chosen from the group consisting of Na+, NH4+ and Mg2+; and z = 1 or 2, representing the number of charges of the cation M, generating on the one hand, a leachate or aqueous solution S2 comprising rare earth cations and actinium, and on the other hand, a leached or exhausted clay; then in which, said solution S2 is subjected to a phase of extraction of the valued rare earths, generating on the one hand, an organic solution S3 or a solid S3 comprising the valued rare earths, and on the other hand a raffinate R comprising the salt of M1 / zCl or of M2 / zSO4, actinium in cationic form, and the non-valued rare earths;The raffinate R is brought into contact with a quantity of fresh ionic clay, forming a new solution S2; said new solution S2 is then subjected to a new phase of extraction of the valuable rare earths, generating a new raffinate R; the leaching solution constituted by the raffinate R resulting from the successive phases of extraction of the valuable rare earths, continuously circulating in connection with new quantities of fresh ionic clay. Figure 1;

The application discloses a kind of dehydration and recycling method of electrolytic manganese dioxide leaching residue, it is related to the field of hydrometallurgy and chemical solid-liquid separation technology.The method is aimed at the technical problems of low dehydration efficiency, insufficient manganese element recovery and high comprehensive energy consumption in the prior art, after neutralization and composite flocculant flocculation of leaching solution, multi-stage electric field treatment is carried out in turn, including applying alternating electric field in the sedimentation tank for pre-aggregation, applying direct current electric field in plate and frame filter press for pressure filtration dehydration and applying pulse electric field before unloading for deep dehydration, finally unload filter cake and collect filtrate.The method is mainly used for efficient dehydration of leaching residue in the production process of electrolytic manganese dioxide and maximization of manganese resource recovery, to realize energy saving and emission reduction and resource recycling.

The application provides a method for recovering valuable metals in waste lithium battery black powder based on a eutectic solvent, uses a green solvent system composed of a choline / guanidine compound A containing a quaternary ammonium salt structure and an organic carboxylic acid compound B containing two or more carboxyl groups to recover valuable metals in waste lithium battery black powder, realizes preliminary and efficient separation of lithium cobalt manganese and nickel and graphite, recovers cobalt, manganese and lithium from the leaching solution through a step-by-step precipitation method after the lithium cobalt manganese enters the leaching solution, recovers nickel and graphite through acid dissolution separation of the mixture containing nickel and graphite, separates and recovers the mixture of nickel and graphite through subsequent treatment, the leaching conditions are mild, the pollution is small, the cost is low, and the method has good social and economic benefits; the method provided by the application can produce a plurality of high-value products, has the advantages of strong adjustability, high precipitation efficiency, green environmental protection and low cost, and has wide application value in the separation and recovery of valuable metals and graphite resources in battery black powder.

This invention discloses a method for extracting gallium from coal using rare metal extraction technology. Using dry fly ash with a gallium content of 50-80 μg / g as raw material, the method sequentially involves raw material pretreatment, roasting activation, acid leaching, leachate pre-purification, solvent extraction and back-extraction, deep refining, and electrolytic refining to achieve efficient gallium extraction and purification. The core of this method is the destruction of the aluminosilicate lattice through high-temperature roasting activation with soda ash, converting gallium into a soluble state. Impurities are then removed through three stages of deep purification, combined with an alkaline constant-current electrolytic process to prevent impurity co-deposition. This method realizes the resource utilization of low-grade fly ash solid waste, significantly improves the gallium leaching rate and resource recovery rate, and ultimately obtains industrial-grade gallium with high purity.

The application provides a method for separating rare earth and iron aluminum boron from neodymium iron boron calcined material leaching solution. The method provided by the application comprises the following steps: obtaining neodymium iron boron calcined material leaching solution containing rare earth, aluminum, iron and boron based on hydrochloric acid preferential dissolution method, adding an oxidizing agent after adjusting the pH of the leaching solution to 3-5, stirring and reacting, and separating to obtain an iron-containing precipitate and an iron-removed solution; using an organic extractant to extract boron from the iron-removed solution to obtain a boron-containing organic phase and a boron-removed solution; adjusting the pH of the boron-removed solution to 4-5, and then performing deep hydrolysis to remove aluminum, and filtering and separating to obtain an aluminum-containing precipitate and a purified rare earth solution for extracting and separating rare earth; using deionized water or an alkaline solution to back-extract boron from the boron-containing organic phase, recycling the organic phase, and concentrating the back-extraction solution to obtain a boron-containing crystalline product. The method provided by the application can recover boron in the neodymium iron boron calcined material leaching solution, is conducive to the removal of aluminum by hydrolysis and reduces the loss of rare earth, and greatly reduces the environmental pressure and the subsequent wastewater treatment pressure.

This invention provides a method for recovering valuable metals from waste ternary lithium battery cathode materials. The recovery method includes: (1) reducing and leaching the black powder of waste ternary lithium battery cathode materials to obtain a leaching slurry, and removing impurities from the leaching slurry to obtain a ternary leachate; (2) extracting the ternary leachate to remove calcium and copper to obtain an organic phase loaded with calcium and copper and a raffinate after calcium and copper extraction; (3) treating the raffinate after calcium and copper extraction with resin to remove fluoride and phosphorus to obtain a solution after fluoride and phosphorus removal; (4) co-extracting the solution after fluoride and phosphorus removal with nickel, cobalt, and manganese to obtain a mixed solution containing nickel, cobalt, and manganese and a lithium-containing solution. The recovery method provided by this invention has a high recovery rate of valuable metals, thorough separation of impurities, and yields a battery-grade mixed solution of nickel, cobalt, and manganese that can be directly used to prepare ternary precursors. It also achieves lithium recovery. The recovery method is simple, efficient, and has low environmental pollution.

This invention discloses a method for preparing iron phosphate and its application, belonging to the field of new energy battery materials technology. The method for preparing iron phosphate provided by this invention includes the following steps: S1. Acid leaching of waste lithium iron phosphate to obtain a leachate; S2. Mixing the leachate with citric acid and then carrying out a hydrothermal reaction; the heating mechanism of the hydrothermal reaction includes a first holding platform at a temperature of 60-70℃ for a holding time > 0.5h, a second holding platform at a temperature of 90-100℃ for a holding time > 0.5h, and a third holding platform at a temperature of 105-160℃, carried out sequentially. The preparation method provided by this invention can produce near-spherical iron phosphate with high uniformity, good dispersibility, and low impurity content, and can utilize waste lithium iron phosphate as raw material. This invention also provides applications of the above preparation method.

This invention discloses a highly efficient method for reducing ferric ions in zinc leaching solution, belonging to the field of hydrometallurgical technology. The zinc leaching solution and zinc sulfide concentrate are placed in a closed reactor and subjected to a pressure-enhanced reduction reaction at a temperature of 100-120℃ and a pressure of 0.2-0.3 MPa to reduce the ferric ions in the leaching solution. Simultaneously, compressed air is introduced into the reaction system to prevent the generation of hydrogen sulfide gas. The reaction time is 0.5-2.0 h. The reduced reaction system is then settled and filtered to obtain the reduced solution and reduced sulfur residue. This technical solution innovatively proposes the use of compressed air for pressure-enhanced reduction of Fe in zinc leaching solution. 3+ This achieves the suppression of H2S gas generation while avoiding the reduction of Fe. 2+ It is oxidized again to Fe by a high concentration of O2. 3+ The pressurized reduction process within a closed container significantly improves reduction efficiency while enhancing the production environment. It achieves the cascade separation and enrichment of multiple metals, closed-loop circulation of the medium, and the reduction, resource recovery, and harmless treatment of slag.

The application provides a copper selection process of iron-containing waste residue, and comprises the following steps: adding iron powder and ammonium fluoride into titanium dioxide waste acid to obtain a titanium dioxide waste acid pre-solution after a period of reaction; S2, adding the iron-containing waste residue into the titanium dioxide waste acid pre-solution, and controlling the reaction temperature to be 20-50 DEG C; S3, after the reaction is completed, adding a nano precipitant when the pH of the solution is adjusted to 3-4.5, and adding a modified flocculating agent after a period of reaction, so that the precipitated copper is obtained after filtration and washing.

This invention discloses a method for simultaneously separating iron and gallium from acid leaching solutions of coal-based solid waste, belonging to the field of coal-based solid waste resource utilization technology. The method includes: adjusting the pH of the acid leaching solution of coal-based solid waste to obtain a pretreated leachate; subjecting the pretreated leachate to hydrothermal precipitation to obtain reaction products; and subsequently subjecting the reaction products to sedimentation treatment to obtain an aluminum-containing solution and gallium-rich iron slag. This invention achieves efficient separation of the impurity component iron and preliminary enrichment of the valuable component gallium from acid leaching solutions of coal-based solid waste simultaneously through simple hydrothermal precipitation without introducing any exogenous impurity ions. The process is simple, the operating conditions are mild, and it provides a stable and reliable technical path for the treatment of acid leaching solutions of coal-based solid waste.

This invention discloses a method for the tiered extraction of copper anode slime from co-smelting copper anodes, belonging to the fields of resource comprehensive utilization and non-ferrous metal metallurgy. The method is used to treat copper anode slime produced after co-smelting waste circuit board pyrolysis residue and copper sulfide ore, followed by blowing and electrolytic refining. The method includes: sulfidation leaching of the copper anode slime to preferentially allow tellurium to enter the leachate; reduction precipitation of the tellurium-containing leachate to recover tellurium products; atmospheric pressure mixed acid leaching of the sulfidation leaching residue to preferentially allow copper and selenium to enter the leachate, yielding a copper-selenium-containing leachate and a precious metal-enriched slag; chlorination leaching of the precious metal-enriched slag to allow gold to enter the chlorinated leachate and separate from silver; and SO2 reduction precipitation and extraction separation of the copper-selenium-containing leachate to sequentially recover selenium and copper. This method can achieve tiered separation and efficient recovery of Te, Se, Au, Ag, and Cu from novel copper anode slime produced by co-smelting, and has the advantages of a clear process, good selectivity, and suitability for closed-loop operation.

The present application relates to the technical field of metal extraction, and particularly relates to a lithium extraction process for brown salt lake clay containing lithium-adsorbed ash. The lithium extraction process for brown salt lake clay containing lithium-adsorbed ash comprises the following steps: crushing and sieving the brown salt lake clay containing lithium-adsorbed ash, then immersing fine particles in a leaching agent, and filtering to obtain a leaching solution containing lithium elements; wherein the leaching agent is configured by low-mineralization water and concentrated sulfuric acid, the volume of the concentrated sulfuric acid is 5% to 20% of the volume of the leaching agent, and the low-mineralization water is natural water in Mahai Basin. The present application configures a composite leaching system by compounding low-mineralization water in a mining area with sulfuric acid, and through the triple synergistic effect of H + , SO4 2‑ and cations in low-mineralization water dissociated by sulfuric acid, the lithium leaching rate of 86.88% is achieved while the cost of the leaching agent is significantly reduced.

The application discloses a beneficiation method of low-grade tin ore by using magnetic separation and flotation. The beneficiation method of low-grade tin ore by using magnetic separation and flotation comprises the following steps: step (1), crushing and grinding the low-grade tin ore, using water as a leaching agent, and separating by a wet magnetic separator to obtain magnetic minerals and magnetic tailings; step (2), drying the magnetic tailings after the magnetic separation, and then placing the tailings in a flotation agent to perform a flotation treatment to obtain flotation minerals and flotation tailings; step (3), concentrating the flotation tailings after the flotation treatment to obtain concentrated tailings; and step (4), smelting the concentrated tailings to finally obtain tin metal, sulfide, silicate, oxide and impurities. The application combines the magnetic separation and the flotation to improve the ore separation efficiency and the recovery rate, the water is used as a leaching liquid in the magnetic separation process to reduce the cost, and no new impurities are introduced, and the flotation agent can reduce the surface tension of the tin ore to improve the leaching rate.

The present application relates to a method for recovering valuable elements by using a cerium methanesulfonate system leaching agent. The method comprises: mixing the cerium methanesulfonate system leaching agent with a material containing valuable elements M, carrying out a leaching reaction to obtain a leaching solution and a leaching residue; electrolyzing the leaching solution, and M ions are reduced and precipitated at the cathode to obtain M metal; after electrolysis, the leaching solution is electrolyzed at the anode, and Ce 3+ is oxidized to Ce 4+ to obtain a regenerated cerium methanesulfonate system leaching agent. The present application uses a cerium methanesulfonate system leaching agent comprising Ce 4+ and methanesulfonic acid to leach waste materials containing valuable elements, and through electrolysis, valuable element metals are recovered and Ce 4+ is regenerated by oxidation and recycled, thus eliminating the generation of pollutants such as NO x from the source, and realizing the green and efficient recovery of valuable elements.

The application discloses a resource utilization method of high-fluorine and high-chlorine soot, and belongs to the technical field of metallurgical solid waste treatment. The resource utilization method of high-fluorine and high-chlorine soot comprises the following steps: performing alkali leaching treatment on the high-fluorine and high-chlorine soot to obtain an alkali leaching solution and an alkali leaching residue; performing one-stage acid leaching on the alkali leaching residue to obtain a one-stage leaching solution and a one-stage leaching residue; performing two-stage acid leaching on the one-stage leaching residue to obtain a two-stage leaching solution and a two-stage leaching residue; recycling the two-stage leaching solution to the one-stage acid leaching system, and outputting at least part of the two-stage leaching residue as lead residue; sequentially performing indium displacement and cadmium displacement on the one-stage leaching solution to obtain indium residue, cadmium residue and cadmium displacement solution; respectively recovering thallium from the alkali leaching solution, recovering indium from the indium residue, recovering cadmium from the cadmium residue, and recovering zinc from the cadmium displacement solution. The method realizes efficient separation and resource utilization of thallium, indium, cadmium, zinc and lead in the high-fluorine and high-chlorine soot.

This invention discloses a method for extracting molybdenum from molybdenum oxide raw materials, comprising: mixing the molybdenum oxide raw materials with a certain proportion of leaching agent for leaching to obtain a first leaching solution for later use; removing impurities from the first leaching solution through resin or extractant to obtain a molybdenum-containing purified solution; adding a control agent to the molybdenum-containing purified solution to obtain a precursor solution; and placing the precursor solution in an autoclave for heating and decomposition to obtain the final product. The process of this invention can prepare molybdenum dioxide products in a short time, with simple steps and low economic cost, and avoids the introduction of ammonia nitrogen reagents throughout the process, thus preventing the generation of ammonia nitrogen waste pollutants. The molybdenum leaching rate during the leaching process and the molybdenum precipitation rate during the product preparation process of this invention exceed 99.5%.