2741 results about "Pregnant leach solution" patented technology

The invention provides a method for leaching copper-cobalt sulfide ore under efficient oxygen pressure, and relates to the technical field of metallurgy. The method for efficiently leaching the copper-cobalt sulfide ores under the oxygen pressure comprises the following steps: mixing materials including the copper-cobalt sulfide ores, sulfuric acid and water, slurrying, and then carrying out an oxygen pressure leaching reaction; and after the oxygen pressure leaching reaction is finished, solid-liquid separation is carried out, and leaching residues and leaching liquid are obtained. According to the method, the self-exothermic reaction of the excess sulfur element in the copper-cobalt sulfide ore is utilized, additional heating is not needed in the reaction process, then the oxygen pressure leaching reaction can be rapidly completed at a high temperature in a short time, and SO2 is not generated in the reaction process. The method for high-efficiency oxygen pressure leaching of the copper-cobalt sulfide ore has the advantages of being high in reaction speed, low in reaction energy consumption, easy to operate, environmentally friendly, easy to achieve industrial application and the like.

The invention belongs to the technical field of resource recovery, and discloses a recovery method of a battery powder short extraction process of a waste power battery, which comprises the following steps: (1) leaching; (2) impurity removal: removing copper, iron and aluminum from the leaching solution to obtain an impurity-removed solution; (3) manganese extraction: extracting manganese from the impurity-removed liquid by using a Cyanex272 extraction agent to obtain an extract liquid 1 and a raffinate 1; (4) nickel-cobalt co-extraction: carrying out nickel-cobalt co-extraction on the raffinate 1 by using a BC196 extracting agent to obtain an extracting solution 2 and a raffinate 2; (5) removing calcium and magnesium: removing calcium and magnesium from the raffinate 2 through resin to obtain a lithium-containing solution; and (6) lithium extraction: extracting and enriching the lithium-containing solution to obtain extract liquor 3 and raffinate 3. According to the method, in the extraction and recovery process of nickel, cobalt and manganese, the number of traditionally needed five or more extraction lines is reduced to two, in the lithium recovery process, lithium extraction is adopted, lithium in raffinate can be reduced to be within 10 ppm, and the concentration of lithium in strip liquor reaches 20 g / L or above.

A method for removing iron and aluminum from a lateritic nickel ore leachate by means of a goethite process, which method comprises the following steps: first-stage iron and aluminum removal, involving: adding a precipitant solution to a lateritic nickel ore leachate, reacting same for 45-90 minutes with the feeding speed controlled to be 5-80 mL / min, the pH controlled to be 3.0-3.2 and the reaction temperature controlled to be 60-70ºC, and performing solid-liquid separation, so as to obtain first-stage iron and aluminum residues and a filtrate; and second-stage iron and aluminum removal, involving: adding a precipitant solution to the filtrate, reacting same for 30-60 minutes with the pH controlled to be 4.3-4.4 and the reaction temperature controlled to be 60-70ºC, and performing solid-liquid separation, so as to obtain second-stage iron and aluminum residues and a purified liquid. Two-stage iron and aluminum removal is used; in the first stage, iron ions in the leachate are effectively separated at a relatively low pH value by controlling the feeding speed, generated residue particles are large, good filtering performance is achieved, and few valuable metals such as nickel, cobalt and manganese are entrained in the residues; in the second stage, the pH is adjusted to 4.3-4.4 to precipitate aluminum ions and the remaining iron ions; and the whole technological process is simple.

The invention discloses a method for synchronously improving the recovery rate of copper and cobalt in high-oxidation-rate copper-cobalt ore and low-grade copper oxide-cobalt concentrate, which comprises the following steps: (1) carrying out copper sulfide flotation on the high-oxidation-rate copper-cobalt ore to obtain high-copper tailings; (2) the low-grade copper-cobalt concentrate and the high-copper tailings are mixed according to the mass ratio of 1: (1-2), and mixed ore is obtained; (3) the obtained mixed ore and a sulfuric acid solution system leaching agent are stirred and mixed, and slurry is obtained; (4) leaching the obtained slurry at normal temperature, and carrying out solid-liquid separation to obtain leached residues and leached liquid; (5) carrying out washing, extraction, reverse extraction and electrodeposition on the obtained leaching residues to obtain metal copper; and removing iron from the raffinate, and adding magnesium oxide into the iron-removed liquid for precipitation to obtain crude cobalt hydroxide. According to the method, the high-copper tailings and the low-grade copper oxide cobalt concentrate are subjected to the processes of ore blending, size mixing, normal-temperature sulfuric acid leaching and the like, the final copper leaching rate is 95% or above, and the cobalt leaching rate is 70% or above.

The invention discloses a method for harmlessly treating lithium slag and preparing a water-stable material from the treated lithium slag. The method comprises the following steps: crushing the lithium slag; mixing a sulfuric acid-containing material with the crushed lithium slag to obtain a pulpified mixture; roasting, and carrying out chemical modification to obtain roasted slag; adding a material containing activated aluminum oxide into the roasting slag to obtain a mixed material; the mixed material is subjected to water leaching and filtering, and leaching residues and leaching liquid are obtained; and drying the leaching slag, adding an exciting agent, and grinding to finally obtain the detoxified lithium slag. And preparing the water-stable material from the detoxified lithium slag. Under the condition of effectively improving the quality of the cement-stabilized layer, the lithium slag resource is effectively utilized, the resource utilization rate is improved, and the mechanical strength and corrosion resistance of the cement-stabilized layer concrete can be effectively improved by matching with the exciting agent and the curing agent.

The invention discloses a high-efficiency multiphase flow classification and separation integrated treatment method for argillaceous sandstone uranium ore. The crushed argillaceous sandstone uranium ore mixed material is sequentially subjected to hydraulic polishing and cluster breaking treatment, high-frequency linear vibration grading treatment, first-stage multiphase flow rotational flow grading treatment, deep low-frequency efficient ultrasonic scrubbing treatment, second-stage multiphase flow rotational flow grading treatment, jet flow uniform mixing treatment, micro-current activating treatment, hardening and tempering thickening and efficient squeezing solid-liquid separation treatment. According to the invention, mud and sand deep stripping and material fine grading separation of the crushed argillaceous sandstone uranium ore are realized, meanwhile, the fine-particle argillaceous material is subjected to efficient uniform mixing activation and deep efficient dehydration, and four core materials, namely a coarse sand material, a fine sand material, tailing dry slag and a high-concentration uranium ore leaching solution, are finally formed through continuous work; finally, efficient multi-phase flow fractional separation, concentration and purification treatment of the argillaceous sandstone uranium ore is achieved, residues of uranium elements in tailings are reduced, and the deep extraction rate of uranium ore resources is increased.

The invention discloses a salt leaching-extraction method for recycling lithium iron phosphate and ternary lithium battery powder through cascade circulation, and belongs to the technical field of waste lithium battery recycling. According to the method, ferric salt is adopted as a leaching agent, a circulation mechanism is constructed through iron ion valence state conversion, and cascade leaching circulation of waste lithium iron phosphate and nickel cobalt lithium manganate battery powder is achieved. A concentrated enrichment liquid containing lithium, nickel, cobalt and manganese, iron phosphate and a graphite crude product can be obtained through multiple leaching cycles. In the leaching circulation process, a mixed solvent is developed as an extraction agent of iron ions, and after extraction and hydrochloric acid reverse extraction are carried out on a leaching solution containing iron salt, the leaching agent and the extraction agent can be recycled. According to the method, the valuable metal in the waste battery powder is efficiently leached under the milder reaction condition, consumption of chemicals such as acid and alkali, a leaching agent, an oxidizing agent and an extracting agent is effectively reduced through research of a circulation mechanism, the cost is remarkably reduced, and good environmental benefits and economic benefits are achieved.

The invention discloses a method for recovering lithium, nickel cobalt manganese composite hydroxide and aluminum copper powder from a waste ternary lithium ion battery pole piece. The method comprises the following steps: treating waste pole pieces of a ternary plant or a mixture of positive and negative pole pieces by using a Fenton technology, leaching by using a mixed ferric salt solution, and filtering to obtain lithium-containing leachate and slag; adjusting the pH value of the leachate, oxidizing and filtering to obtain a purified solution and ferric hydroxide precipitate, and adding the purified solution and a lithium hydroxide solution into a reactor for coprecipitation to obtain a deeply purified solution and the nickel-cobalt-manganese composite hydroxide. And dissolving the ferric hydroxide precipitate with dilute acid, adding a reducing agent to generate a ferrous salt solution, and returning the ferrous salt solution for Fenton reaction and leaching reaction. And adding the sodium carbonate saturated solution into the deep purification solution, and crystallizing and precipitating to obtain the battery-grade lithium carbonate. And performing hydrodynamic screening on the leaching residues to obtain an aluminum-copper mixture and graphite residues, and performing grinding and specific gravity separation on the aluminum-copper mixture to obtain high-purity aluminum powder and copper powder. According to the method, the iron salt is directly leached from the pole piece, the used iron salt can be recycled, and the method is suitable for large-scale recovery of the waste ternary lithium ion battery.

The invention discloses a recycling multi-stage treatment method for copper-containing solid waste, and belongs to the technical field of recycling treatment of the copper-containing solid waste. The recycling multi-stage treatment method for the copper-containing solid waste comprises the following steps: (1) crushing the copper-containing solid waste to obtain pretreated copper-containing solid waste; (2) the pretreated copper-containing solid waste is added into a leaching agent and stirred, and a leaching solution and solid-phase residues are separated through a filter press; (3) adding an organic complexing agent into the leachate, stirring, carrying out solid-liquid separation to obtain a precipitate and a first waste liquid, carrying out washing, filter pressing and drying on the precipitate to obtain a copper-containing substance, and extracting and refining the copper-containing substance to obtain metal copper and a second waste liquid; (4) mixing the first waste liquid and the second waste liquid, and filtering to obtain dischargeable water; and (5) adding a stabilizer into the solid-phase residues, heating and stirring to obtain a solidified body. The method can effectively improve the copper recovery rate and reduce environmental pollution.

The invention discloses a method for extracting valuable metals from black powder of waste lithium ion batteries, and belongs to the technical field of recycling of waste lithium ion batteries. According to the method, valuable metals are extracted from the waste lithium ion battery black powder by adopting low-temperature roasting and water leaching, the waste lithium ion battery black powder is taken as a raw material, sulfamic acid is taken as a roasting agent, the waste lithium ion battery is pretreated, and roasting for carbon removal, metal extraction and water leaching are performed in sequence, so that the valuable metals are obtained. And leaching liquid and leaching residues containing two or more elements of lithium, nickel, cobalt, manganese, iron and aluminum are obtained and are used for further purification and recovery of valuable metals. According to the method provided by the invention, the influence of aluminum dissolution on recovery of other metals is reduced, the use of hydrogen peroxide is avoided, the process flow is shortened, the process cost is greatly reduced, the roasting and water leaching processes cannot corrode equipment, and the whole process cannot generate waste acid to cause secondary pollution.

The invention discloses a low-permeability sandstone type uranium mine single-well injection and production method, and belongs to the technical field of in-situ leaching uranium mining. The method comprises the steps that an injection and production well is drilled from the ground to a uranium mine layer; pumping liquid carbon dioxide into the uranium ore layer and soaking; a leaching agent is injected into the uranium ore layer in stages, and soaking is carried out every time the leaching agent is injected; extracting the leachate until the uranium concentration in the leachate is reduced by 10% compared with the initial concentration or the uranium concentration in the leachate is reduced to the preset concentration; carbon dioxide and a leaching agent are supplemented into tail liquid formed after uranium recovery is conducted on the leachate, the tail liquid reaches a saturated state, and the tail liquid in the saturated state is reinjected into the uranium ore layer; and a cycle operation step.

The invention discloses an oxidation leaching system and method for argillaceous sandstone uranium ore. The system comprises a uranium leaching pool, a recovery pool, a liquid preparation-dosing unit pool and an intermediate pool. Wherein the uranium leaching tank is provided with a water dispersing layer, a uranium ore layer and a liquid collecting layer from top to bottom, and efficient oxidation of uranium ore is achieved through coupling of oxygen and ferric iron; the recovery pool is sequentially provided with a resin adsorption layer and a water inlet layer from top to bottom, and efficient recovery of uranium in the leachate is achieved; the liquid preparation-dosing unit pool is provided with an acid-resistant submersible sewage pump used for circularly conveying the ore leaching liquid to the uranium leaching pool and adjusting the pH value of the ore leaching liquid and the initial concentration of Fe < 3 + >. And the middle tank drives the ore leaching liquid to form periodic tidal flow circulation in the uranium leaching tank through an acid-resistant submersible sewage pump. According to the system and the method, tidal flow regulation and control, aeration oxygen supply enhancement and iron ion circulation oxidation technologies are coupled, and the uranium leaching rate gt of the argillaceous sandstone uranium ore is achieved by establishing a multi-stage oxidation field domain, optimizing a fluid migration path and establishing an iron element regeneration mechanism; 92%.

The invention discloses a method for selectively extracting rubidium from lithium ore tailings in a short process, and relates to the field of comprehensive utilization of mineral waste. The method comprises the following steps: grinding the lithium ore tailings into powder; adding an additive into the lithium ore tailing powder, and fully stirring and mixing; roasting the mixture to obtain a calcined clinker; directly carrying out water leaching on the calcined clinker; rubidium enrichment liquid and leaching residues are obtained from the leaching liquid through solid-liquid separation; the rubidium extraction composite material is mixed with rubidium enrichment liquid, and selective adsorption of rubidium is achieved; and recycling the composite material, and the like. According to the method, efficient selective recovery of rubidium in the lithium ore tailings is achieved, the water leaching time is shortened, the water leaching temperature and the rubidium extraction roasting reaction temperature are reduced, the separation efficiency of impurities in the lithium ore tailings and the selective recovery efficiency of the rubidium element are remarkably improved, and efficient selective recovery of rubidium in the lithium ore tailings is achieved.

The invention discloses a thallium-containing lithium slag treatment method and device based on chemical leaching and biological mineralization, and the method comprises the following steps: carrying out ore blending on thallium-containing lithium slag and a leaching agent, grinding in a sampling machine, uniformly mixing, and carrying out ball milling to obtain blended slag; leaching the prepared slag in water to obtain water-leached ore pulp; carrying out solid-liquid separation on the water-leached ore pulp to obtain elution residues and leachate; refluxing the leachate for cyclic utilization; inoculating a thallium-fixing microbial inoculum into the leachate with the thallium concentration higher than 20mg / L, and carrying out biochemical mineralization reaction to obtain biochemical ore pulp; carrying out solid-liquid separation on the biochemical ore pulp to obtain solid thallium slag and leaching tail liquid; and leaching tail liquid is subjected to membrane filtration. By the adoption of the method and device, the ecological environment risk caused by migration of thallium in the lithium slag is relieved, and enrichment and extraction of thallium are achieved.

This invention discloses a method for leaching lithium iron phosphate mixed powder with iron salts and recovering all components, belonging to the field of battery recycling. The invention uses an iron salt solution to leach the mixed powder, obtaining a lithium-containing leachate and leaching residue. Ferrous ions in the leachate are regenerated into ferric iron through acidification and oxidation, and recycled for leaching the next batch of mixed powder. After reaching a preset number of cycles, the leachate is used for re-leaching multiple batches of leaching residue to improve the lithium leaching rate. Ultimately, a enriched solution containing Li, Fe, Cu, and Al and graphite-containing iron phosphate residue are obtained. Copper is recovered from the enriched solution through iron powder replacement, and a high-purity lithium chloride solution is obtained through extraction and separation, while ferric chloride (recycled) and aluminum chloride crystals are also recovered. The leaching residue is treated with hydrochloric acid to obtain regenerated graphite, and the pH is adjusted with alkali to obtain high-purity iron phosphate. This method achieves full component recovery under mild conditions, reducing separation steps and chemical consumption through a "leaching-regeneration-leaching" cycle mechanism, thus achieving both environmental and economic benefits.

The invention relates to the technical field of waste catalyst recovery, and particularly discloses a method for recovering valuable metals from a waste catalyst containing vanadium and molybdenum. Comprising the following steps: S1, heating and roasting the waste catalyst containing vanadium and molybdenum, continuously heating and roasting, and cooling to obtain a roasted material; s2, mixing the roasted material with a sulfuric acid solution A containing oxalic acid, and heating and leaching to obtain a leaching solution A and a residue A; mixing the residue A with a sulfuric acid solution B containing thiourea and ethylenediaminetetraacetic acid, heating, carrying out secondary leaching to obtain a leaching solution B and a residue B, and washing the residue B with an acid solution to obtain a washing solution; combining the leaching solution and the washing solution to obtain a combined solution; s3, adjusting the pH value of the mixed solution to 2.5-3, then adjusting the pH value to 4.5-5, adding a dimethylglyoxime alcohol solution, and heating to obtain a purified solution; uniformly mixing the purified liquid with the extraction liquid to obtain an organic phase containing vanadium and molybdenum; and S4, reverse extraction and product preparation. The ammonium molybdate and the vanadium pentoxide obtained in the invention have high purity, and the recovery rate of vanadium and molybdenum is high.

The invention relates to the technical field of molybdenum metallurgy, and particularly discloses a crystal preparation method of ammonium heptamolybdate, which comprises the following steps: taking low-grade molybdenite, crushing, ball-milling, and calcining to obtain molybdenum calcine. And dispersing the molybdenum calcine with a sodium hydroxide solution, and filtering to obtain a leaching solution. And then adding a compound chelating agent into the leachate, carrying out adsorption and desorption treatment to obtain a sodium molybdate solution, then adjusting the pH value, carrying out ammonia leaching, and then carrying out cooling crystallization to obtain ammonium heptamolybdate. By adopting the prepared compound chelating agent, the purity of ammonium heptamolybdate prepared by taking low-grade molybdenite as a raw material can be improved, and after desorption treatment, separated precipitates can be used as the compound chelating agent again for adsorbing molybdate radicals, so that the aim of cyclic utilization is achieved.

The invention discloses a laterite nickel ore leachate extraction tower which comprises an extraction tower body, a heavy phase feeding mechanism, a light phase feeding mechanism, a baffle mechanism and a gas distribution device, the extraction tower body comprises a tower body, a containing cavity is formed in the tower body, and an upper clarifying groove is formed in the top of the tower body; the baffle mechanism comprises at least one movable baffle arranged in the tower body and a lifting driving piece, and through holes are densely distributed in the movable baffles. A heavy phase and a light phase are promoted to be mixed in an air floatation mode, and meanwhile, the lifting driving part drives the movable baffle to move up and down, so that the movable baffle is always located in the light phase in the tower body and located in a preset height range above an interface of the light phase and the heavy phase. When a heavy phase upwards penetrates through each through hole in the movable baffle, the heavy phase is dispersed into small liquid beads, so that the heavy phase is in full contact with a light phase above, the mixing effect is improved, and the extraction efficiency is improved.

The invention discloses a method for preparing battery-grade iron phosphate by recovering lithium iron phosphate battery black powder, which comprises the following steps of: performing reduction acid leaching on the lithium iron phosphate battery black powder to obtain acid leaching liquid; adding sodium silicate into the acid leaching solution to adjust the pH value of the solution to 2.5-4, removing aluminum and titanium to obtain a primary impurity-removed solution, deeply removing aluminum and titanium from the impurity-removed solution by adopting ion exchange resin, and removing copper and filtering by adopting sulfide to obtain a copper-removed solution; supplementing iron is added into the copper removal liquid, the pH is adjusted to 3.5-6.5, ferrous phosphate reacts and is separated out, and ferrous phosphate is obtained; the method comprises the following steps: carrying out acid leaching on ferrous phosphate to obtain a leaching solution, adjusting the molar ratio of iron to phosphorus in the leaching solution, carrying out oxidation precipitation, adjusting the pH value of the solution again, aging, filtering, washing and drying to obtain iron phosphate dihydrate, and finally calcining to obtain the anhydrous iron phosphate. According to the method, a process route for producing iron phosphate by an ammonium method is used for reference, iron and phosphorus in the black powder of the lithium iron phosphate battery are recycled and converted into battery-grade iron phosphate in a ferrous phosphate form, impurities such as aluminum, titanium and copper are effectively removed, and the impurities are prevented from being entrained in the iron phosphate.

The invention discloses an efficient multiphase flow fractional separation, concentration and purification treatment system for argillaceous sandstone uranium ore. Comprising a hydraulic polishing and breaking pretreatment device, a high-frequency linear vibration classification device, a first-stage multiphase flow cyclone classification device, an energy-gathered ultrasonic scrubbing device, a second-stage multiphase flow cyclone classification device, a high-frequency linear vibration dehydration device, an efficient uniform mixing activation system and a tempering squeezing dehydration system. According to the invention, mud and sand deep stripping and material fine grading separation of the crushed argillaceous sandstone uranium ore are realized, meanwhile, the fine-particle argillaceous material is subjected to efficient uniform mixing activation and deep efficient dehydration, and four core materials, namely a coarse sand material, a fine sand material, tailing dry slag and a high-concentration uranium ore leaching solution, are finally formed through continuous work; finally, efficient multi-phase flow fractional separation, concentration and purification treatment of the argillaceous sandstone uranium ore is achieved, residues of uranium elements in tailings are reduced, and the deep extraction rate of uranium ore resources is increased.

The present invention relates to the technical field of inorganic materials, and particularly to a method for clean smelting of beryllium oxide and beryllium oxide. The smelting method includes using iron powder to remove trivalent iron in the acid leaching solution of beryllium ore; using a non-saponified extraction system without sodium ions and ammonium cations, and the non-saponified extraction system exchanges hydrogen ions with itself when extracting beryllium ions. The present invention solves the problems existing in beryllium smelting preparation in the prior art, such as low beryllium recovery rate, easy interference by associated elements, large pollution, and difficult waste liquid treatment. An alkaline earth metal compound is used as a raffinate impurity removal reagent and a non-saponified extraction system, and the raffinate after impurity removal is recycled for beryllium ore leaching, improving the beryllium recovery rate and reducing the environmental pollution caused by waste liquid discharge.

The invention provides a method for recycling scandium, iron and aluminum from acid leachate through fractional precipitation, and belongs to the field of hydrometallurgy. The method comprises the following steps: adding a reducing agent into an acid leaching solution to obtain a first modified leaching solution; adding a stable complexing agent into the first modified leaching solution to obtain a second modified leaching solution; adding a pH regulator into the second modified leaching solution, and regulating the pH value of the second modified leaching solution to 3.5-4.5 to obtain a coarse scandium product and a scandium precipitation solution; an oxidizing agent is dropwise added into the scandium precipitation solution, and an iron product and an iron precipitation solution are obtained; and adding a pH regulator into the iron precipitation liquid to regulate the pH value of the iron precipitation liquid to be greater than or equal to 6.0, and carrying out ultrasonic enhanced aluminum ion precipitation to obtain an aluminum product and an aluminum precipitation liquid. Selective modification of metal ions is achieved by adding a reducing agent and a complexing agent, scandium is precipitated through pH regulation and control, iron is precipitated through oxidation regulation and control, and finally complexation and precipitation of aluminum are blocked, so that the separation efficiency of scandium, iron and aluminum in the acid leaching solution is improved at the same time.

The invention discloses a method for comprehensively recovering silicon and magnesium based on rotary kiln-electric furnace type ferronickel slag. The method comprises the following steps: carrying out ball milling, leaching and solid-liquid separation on the rotary kiln-electric furnace type ferronickel slag, standing supersaturated silicon in a leaching solution at normal temperature to generate a gel phenomenon, stirring and crushing to obtain a mixed phase of a magnesium sulfate solution and a silica gel block, and separating the gel solution to obtain a magnesium sulfate crude solution and wet crude silica gel; preparing high-purity hydrated magnesium sulfate with the purity of 99.9% from the magnesium sulfate crude liquid through processes of purification, crystallization and the like; the wet coarse silica gel is subjected to further alkali dissolution, gel forming and other processes to produce silica gel with the purity of 99%; the method has the advantages of low energy consumption, high product added value and element recovery rate and convenience in industrialization, and has excellent popularization and application prospects.

The invention relates to a method for leaching valuable metals from a waste ternary lithium ion battery positive electrode material NCM111, and belongs to the technical field of recycling of waste lithium batteries. The preparation method comprises the following steps: adding L-ornithine hydrochloride and ascorbic acid into deionized water, and stirring and reacting at the temperature of 40-70 DEG C to generate a colorless and transparent deep eutectic solvent; the method comprises the following steps: adding the waste ternary lithium ion battery positive electrode material into a deep eutectic solvent, and stirring and leaching for 2-8 minutes at the temperature of 40-70 DEG C to obtain a valuable metal leaching solution; the deep eutectic solvent is used for leaching lithium, manganese, cobalt and nickel from the waste ternary lithium ion battery positive electrode material, leaching is only carried out for 4 min at the leaching temperature of 60 DEG C, and the leaching rate can reach 98% or above.

The invention discloses a stone coal vanadium extraction method, and belongs to the technical field of stone coal vanadium extraction, and the method comprises the following steps: crushing stone coal vanadium ore, and simultaneously carrying out microwave irradiation to obtain an activated sample; immersing the activated sample and an oxidizing agent solution into an acid solution, heating and reacting to obtain a suspension, and carrying out solid-liquid separation to obtain a leachate; then, vanadium in the leachate is adsorbed and enriched through ion exchange resin containing quaternary ammonium groups, and an enriched vanadium solution is obtained through desorption with alkali liquor; then adjusting the pH value of the enriched vanadium liquid, adding an impurity removal agent, uniformly stirring, standing, and carrying out solid-liquid separation to obtain a purified liquid; finally, a precipitator is added into the purified liquid, solid-liquid separation is carried out after the reaction is completed, and the ammonium polyvanadate product is obtained.The method not only can remarkably reduce energy consumption, but also can effectively improve the purity of ammonium polyvanadate.

A method for recovering heavy metals and soluble chlorine salts from fly ash generated by incineration of domestic waste. The method comprises the following steps: first, mixing fly ash with water and an acid, performing a leaching reaction when a pH value is controlled, improving the leaching efficiency of lead and zinc by means of air agitation, and measuring dissolved oxygen or redox potential to determine a leaching reaction endpoint; second, using a vulcanizing agent to recover leached heavy metals, and adjusting and monitoring the pH value of a leachate so as to control the adding amount of the vulcanizing agent; third, adding an alkali to adjust the pH value of the leachate so as to precipitate impurities such as aluminum and iron, and using an excessive amount of the vulcanizing agent to further remove heavy metals; and finally, adding an oxidizing agent and an iron salt coagulant into the leachate from which the heavy metals and impurities are removed, so as to remove divalent sulfur and arsenic, wherein the finally purified leachate can be used for recovering soluble chlorine salts. The method has a simple and efficient process, can significantly increase the recovery rate of heavy metals, and recovers heavy metals in the form of metal sulfides, thus facilitating subsequent separation treatment. The treated fly ash can be used as a raw material of cement, thus achieving efficient utilization of resources.

The invention discloses a tailing agitation leaching device and process, and belongs to the technical field of tailing leaching. The tailing stirring and leaching device comprises a leaching tank, a rotating shaft is rotationally connected in the leaching tank, the side wall of the rotating shaft is rotationally connected with a stirring rod through a hinge seat, the tailing stirring and leaching device further comprises a smashing assembly, a stirring assembly and a stirring assembly, and the smashing assembly is arranged in the leaching tank and used for smashing tailings in the leaching tank; through rotation of a stirring rod and semispherical blocks, a mixed solution of tailings and a leaching solution is stirred, the tailings and the leaching solution are uniformly mixed, the leaching effect is effectively improved, the three sets of semispherical blocks intermittently collide in the rotating process through the attraction effect of a first magnetic plate and a second magnetic plate, and the leaching effect is effectively improved. And the two extrusion plates are arranged in the leaching liquid, so that tailings which suspend in the leaching liquid and are located between the two extrusion plates are crushed, the leaching liquid can make full contact with tailings particles, then dissolution of metal in the tailings is promoted, and the leaching effect is improved.

The invention relates to a waste photovoltaic panel recycling method which comprises the following steps: crushing a waste photovoltaic panel until the size of the waste photovoltaic panel is 80-160 meshes, and preparing powder; carrying out acid leaching treatment on the powder, and respectively collecting a leaching solution and a solid material; an acid leaching solution adopted in the acid leaching treatment is a mixed acid aqueous solution of hydrochloric acid and sulfuric acid; the pH of the leachate is adjusted to be neutral with an alkaline agent, then the leachate is mixed with metal iron to be subjected to a replacement reaction, and metal copper is prepared; the solid material is mixed with water, hydrofluoric acid and a flotation agent are added into the obtained mixture for flotation treatment, floats and precipitates are collected respectively, the floats comprise silicon powder, the precipitates comprise glass powder, and the flotation agent comprises one or two of hexadecyl potassium hydrogen phosphate and sodium dodecyl sulfate. According to the recycling method, the silicon powder, the glass powder and the metal copper can be comprehensively recycled from the waste photovoltaic panel.

The invention discloses a comprehensive dealkalization method for vanadium extraction waste slag, which comprises the following steps: mixing the vanadium extraction waste slag with a calcium additive, a carbonaceous reducing agent and sodium nitrite for pelletizing, decomposing a sodium-containing solid solution in the vanadium extraction waste slag by adopting a roasting process, and leaching a sodium-containing phase in the waste slag by adopting a hydrothermal leaching process, thereby achieving the purpose of dealkalization. And drying the leaching residues to obtain a sodium-removed iron-containing material, recycling the sodium-removed iron-containing material for an iron-making process, and performing multi-effect evaporation on the leaching solution to form a sodium-containing product which can be directly sold. The process equipment is simple, operation is easy and convenient, recycling of the vanadium extraction waste slag in iron and steel enterprises can be achieved, meanwhile, the process is high in energy utilization rate, little in environmental pollution and low in operation and maintenance cost, large-scale recycling of the vanadium extraction waste slag can be achieved, and good economic benefits and social benefits are achieved.

The invention discloses a method for leaching precious metal through catalytic oxidation of thiosulfate, which comprises the following steps: mixing a copper-containing catalytic system-thiosulfate solution with a precious metal-containing material, and carrying out leaching reaction to obtain a precious metal leachate; wherein a copper-containing catalytic system in the copper-containing catalytic system-thiosulfate solution is a copper-iminodiacetic acid complex. The precious metal is extracted by adopting a copper-iminodiacetic acid catalytic system, the leaching rate of the precious metal and the consumption of thiosulfate can be considered, the leaching effect is remarkably superior to that of an existing copper ammonia system, and industrial application is easy to achieve.