143 results about "Metal leaching" patented technology

The invention belongs to the technical field of waste lithium battery recovery, and particularly relates to a method for selectively extracting lithium from a waste lithium battery positive electrode material based on activation and oxidation, which comprises the following steps: mixing the waste lithium battery positive electrode material, an oxidizing agent, an activating agent and a solvent, stirring and leaching, and carrying out solid-liquid separation to obtain a lithium-rich leaching solution and valuable metal leaching residues; wherein the activating agent is one or more than two of divalent ferrite, divalent cobalt salt, divalent manganese salt, divalent copper salt and monovalent silver salt, and the waste lithium battery positive electrode material is selected from one or more than two of waste nickel cobalt lithium manganate batteries, waste nickel cobalt lithium aluminate batteries, waste lithium cobalt oxide batteries and waste lithium manganate batteries. Through the synergistic effect of the oxidizing agent and the activating agent, preferential extraction of lithium in the raw material is achieved in one step, the problem that the lithium loss amount is large in the later lithium extraction process is solved, and the method has the advantages of being easy and convenient to operate, short in technological process, good in lithium selectivity, high in lithium leaching rate, wide in temperature application range and low in recovery cost.

The invention provides a method for treating discharge wastewater of a waste lithium battery, which comprises the following steps: S1, pulping a lithium cobalt oxide material by using discharge wastewater, and adding a first oxidant for reaction to obtain primary oxidized slurry; s2, mixing the primary oxidized slurry with high-grade matte nickel, and adding a second oxidizing agent for reaction to obtain secondary oxidized slurry; s3, the secondary oxidation slurry and an iron circulation activating agent are mixed for acid leaching, a liquid phase is taken after solid-liquid separation, and metal leaching liquid containing nickel and cobalt is obtained; wherein the first oxidizing agent comprises persulfate, the second oxidizing agent is selected from hydrogen peroxide, and the iron circulation activating agent is at least one of sodium hydrosulfite or sodium pyrosulfite. According to the method, short-range efficient selective recovery of valuable metals is realized through cooperation of lithium cobalt oxide and high nickel matte, the influence on the environment is greatly reduced, and the economic cost of the process is reduced.

The invention relates to a method for recovering tellurium from copper anode slime through cooperation of ultrasound and hydrogen peroxide, and belongs to the field of wet metallurgy of scattered metal. The method comprises the following steps: drying and grinding copper anode slime to obtain copper anode slime powder; the method comprises the following steps: adding copper anode slime powder into a sulfuric acid solution, mixing to obtain copper anode slime slurry, adding hydrogen peroxide into the copper anode slime slurry, carrying out ultrasonic enhanced leaching for 20-160min, and carrying out solid-liquid separation to obtain a leaching solution containing copper and tellurium and high-grade valuable metal leaching residues. According to the method, hydrogen peroxide is effectively promoted to be decomposed by ultrasound to generate hydroxyl radicals, the oxidation potential of a system is regulated and controlled, copper and tellurium are selectively converted into copper ions, tellurate radicals enter a solution, and valuable elements such as gold, silver and selenium are enriched in slag; necessary heat is provided for the reaction by utilizing the heat effect of ultrasonic and heat released by chemical reaction, and extra heating is not needed; strong jet flow generated by ultrasound effectively destroys raw material inclusion and secondary wrapping, reaction mass transfer is enhanced, and the leaching rate of tellurium is increased. The method disclosed by the invention is simple in leaching process operation, low in cost and high in reaction speed.

The invention discloses a copper-cobalt bimetallic catalyst and a preparation method and application thereof. The preparation method comprises the following steps: mixing ZIF-67, a copper source and a solvent, adjusting the pH value to 7.0, stirring, standing, centrifuging, washing and drying to obtain ZIF-67 adsorbed with copper ions, and calcining to obtain the copper-cobalt bimetallic catalyst. Compared with a conventional cobalt-based bimetallic catalyst, the copper-cobalt bimetallic catalyst prepared by the invention has the advantages of large specific surface area, multiple catalytic active sites, high catalytic activity, good structural stability and the like, is a novel catalyst with a novel structure and excellent performance, can efficiently activate peracetic acid and is used for degrading antibiotics; the method can realize deep oxidative degradation of various antibiotics in different water bodies, has the advantages of high reaction system activation rate, high degradation efficiency, wide pH application range, good reusability, low metal leaching amount, no secondary pollution and the like, and is high in use value and good in application prospect.

The invention provides a method for preferentially extracting gold and silver from lead anode slime, and relates to the technical field of precious metal recovery, firstly, silver, antimony and other valuable metals in the lead anode slime are leached into a solution through catalytic oxidation leaching in the presence of a protective agent, and gold is enriched in residues; then, silver is selectively precipitated from the leachate, and silver precipitation residues and a valuable metal solution are obtained; and finally, valuable metals in the solution are recovered by adding a neutralizer and a precipitator, the obtained leaching mother liquor can be returned for leaching after being supplemented with hydrochloric acid, and the valuable metal precipitates are used for recovering antimony and bismuth. The method changes the traditional lead anode slime treatment thinking of first impurity removal and second refining, has the characteristics of high gold and silver direct recovery rate (greater than 99.5%), high reaction speed (total consumed time is less than 1 h), low cost and no generation of waste residue and wastewater, and is expected to solve the problems of long gold and silver recovery process, low direct recovery rate, capital overstock and difficult treatment of arsenic and antimony-containing smoke in the existing lead anode slime treatment method. The method has remarkable economic and environmental benefits and a good application prospect.

The invention belongs to the technical field of precious metal recovery, and provides a method for efficiently recovering platinum group metal in a catalyst through photocatalysis and application thereof, and the method comprises the following steps: mixing a waste catalyst crushed material and metal powder, carrying out mechanochemical treatment, adding an acid solution, and reacting to obtain a modified waste catalyst; the modified waste catalyst and the leaching solution are mixed to obtain suspension liquid, then the suspension liquid is irradiated through ultraviolet-visible light for a photocatalytic reaction, filtering is conducted, and platinum group metal leaching liquid and leaching residues are obtained; and regulating the pH value of the platinum group metal leachate, adding an oxidizing agent, and extracting and separating the transition metal chloride by using an extracting agent to obtain the platinum group metal solution. According to the method, the platinum group metal particles are regulated and controlled while mechanical and chemical treatment activation is adopted, so that the platinum group metal particles generate the plasma resonance effect, strong redox active species generated by a photocatalyst under the illumination condition are converted into soluble compounds through complexation, and efficient leaching and recycling are achieved.

The invention discloses a method for leaching vanadium and molybdenum metal in a failure residual oil hydrogenation catalyst through electrochemical ultrasonic strengthening, the catalyst comprises, by mass, 10-70% of Al2O3, 3-25% of V, 2-15% of Mo and 1-10% of Ni, the method comprises the steps that S1, the failure residual oil hydrogenation catalyst is ground and dried and mixed with a leaching agent according to the preset liquid-solid ratio, and leaching slurry is formed; s2, adding a leaching aid into the leaching slurry, inserting at least one pair of electrode pairs, and meanwhile, applying ultrasonic waves into the leaching slurry to perform electrochemical ultrasonic enhanced leaching; and S3, solid-liquid separation is conducted on the leaching slurry obtained after intensified leaching is completed, and vanadium and molybdenum enriched leaching liquid and leaching residues are obtained. According to the method, an electrochemical field, an ultrasonic field and a leaching aid are synergistically acted on the leaching process of the spent catalyst, so that efficient leaching and recovery of vanadium and molybdenum metals are realized at low temperature and normal pressure, and the technical problems of low leaching efficiency, high energy consumption and serious pollution in the traditional process are solved.

The invention provides a treatment method and device for intelligently and comprehensively utilizing solid waste of a thermal power plant, and relates to the technical field of resource utilization of the solid waste of the thermal power plant, and the method comprises the steps that a multi-mode sensor array detects the particle size, components and magnetic characteristics of the solid waste in real time, and slag, fly ash and desulfurized gypsum are classified through a machine learning model; constructing a virtual model by means of digital twinning, optimizing a melting temperature parameter through deep reinforcement learning, uploading monitoring data to a cloud end through edge calculation, and triggering process adaptive adjustment; iron elements are recycled by a wet high-gradient magnetic separator, copper and aluminum metals are extracted by smelting reduction of non-magnetic slag, and a composite building material is prepared from residues or 5-25mm inert slag is used as a road base; rare metals such as vanadium, titanium and nickel are extracted from residual slag through acid leaching, leaching liquid is subjected to solvent extraction or ion exchange enrichment, processing data are stored through a block chain, and traceability of the whole life cycle is achieved. The comprehensive resource utilization rate of the solid waste of the thermal power plant is remarkably improved, and meanwhile the overall treatment energy consumption is reduced.

A method of refining platinum group metal containing material in a platinum group metal refinery, the method comprising: placing the platinum group metal containing material in a furnace having a flue; thermally processing the platinum group metal containing material in the furnace; capturing flue dust passing through the flue of the furnace during thermal processing of the platinum group metal containing material, said flue dust comprising platinum group metal and base metal; treating the captured flue dust in sulphuric acid to leach the base metal into solution producing a sulphuric acid leach liquor comprising the base metal and a solid residue comprising the platinum group metal; separating the solid residue comprising the platinum group metal from the leach liquor comprising the base metal; and recycling the solid residue comprising the platinum group metal for further processing within the platinum group metal refinery to recover the platinum group metal.

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.

This invention discloses a method for preparing and applying a class of highly efficient catalytic materials for activating persulfate. The preparation method includes: dispersing g-C3N4 in nitric acid at room temperature, stirring, washing, and drying to obtain g-C3N4-H; placing it in an inert atmosphere and treating it at high temperature to obtain a g-C3N4 substrate; mixing it with iron salt, cobalt salt, water, and 1,10-phenanthroline to obtain a suspension; evaporating to dryness, grinding, drying, treating at high temperature, dispersing in nitric acid, washing, drying again, treating at high temperature in an inert atmosphere, and naturally cooling to obtain FeCo-g-C3N4 catalytic material. The method of this invention constructs structurally stable and highly dispersed FeCo bimetallic-nitrogen-carbon active centers on the g-C3N4 substrate; it can achieve efficient degradation of pollutants with low dosage, while the metal leaching rate is extremely low, avoiding secondary pollution; this catalytic material combines high activity, high stability, environmental friendliness, and operational economy, showing outstanding application potential in the field of advanced oxidation water treatment.

This invention relates to the field of non-ferrous metal smelting technology and discloses a high-recovery, emission-reducing copper anode mud treatment process with controlled potential. Each step employs a controlled potential method to regulate the metal leaching rate and reduction rate, thereby reducing the loss rate of valuable metals in each step and improving the overall metal recovery rate. A sulfidation process is used to treat the antimony-bismuth removal solution, enriching antimony and bismuth in the form of sulfides. An evaporation crystallization method is used to open most of the copper in the anode mud in the form of crude copper sulfate. While enriching antimony and bismuth, the production of basic copper carbonate is significantly reduced, eliminating the "rotary kiln selenium distillation" and "water leaching copper separation" processes, and reducing system acid expansion caused by the "rotary kiln selenium distillation" process. By using the recycled reduction solution and secondary gold separation solution as acid sources for the antimony-bismuth removal process and the primary gold separation solution, the waste acid reuse rate and valuable element recovery rate can be improved. This effectively reduces the total wastewater discharge, simplifies the process flow, and improves the recovery rate of valuable metals.

The invention relates to a metal leaching agent and a method for leaching and recovering metal from a retired photovoltaic module step by step. The metal leaching agent comprises an acidophilic thiobacillus ferrooxidans solution, a hidden acidophilic bacteria solution and a thiobacillus thiooxidans solution, the volume ratio of the acidophilic thiobacillus ferrooxidans liquid to the hidden acidophilic bacteria liquid to the thiobacillus thiooxidans liquid is (0.5-1.5): (0.5-1.5): (0.5-1.5); wherein the concentration of the acidophilic thiobacillus ferrooxidans, the acidophilic hidden bacteria and the thiobacillus thiooxidans is (1-9) * 10 < 8 > cells / mL. Furthermore, the invention provides a method for leaching and recovering metal from the retired photovoltaic module step by step. According to the method, the metal leaching agent is utilized, mild and green recovery of aluminum and silver in the decommissioned photovoltaic cell piece and full-process recovery of the decommissioned photovoltaic module can be achieved through step-by-step biological leaching, and the method has the excellent leaching effect on aluminum and silver.

The invention discloses a high-activity nitrogen-doped catalyst for efficiently degrading chemical organic wastewater, which is characterized in that a precursor containing nitrogen or rich functional groups is self-polymerized with metal to anchor a large number of metal ions, and a stable coordination environment is provided for the metal ions through rapid self-polymerization, so that the chemical organic wastewater can be efficiently degraded. Therefore, metal aggregation is inhibited, and metal leaching in the using process is prevented. The catalyst provided by the invention can be used for degrading organic wastewater, has the advantages of small catalyst dosage, good catalyst performance and good degradation effect, can completely degrade dye to the highest degree of 100%, can degrade antibiotics to the highest degree of 99%, and is a catalyst with wide application prospects in the field of chemical organic wastewater treatment.

This invention provides a method for recycling waste lithium batteries based on the intrinsic photogenerated electron-hole pair separation of the cathode sheet. The method involves: whole-body crushing of the waste cathode sheet containing the positive electrode active material and aluminum foil current collector to form a mixture; placing the mixture in an acid leaching solution, and then applying an external light field matching the light absorption band of the cathode material. Under illumination, the cathode material is excited to generate electron-hole pairs, where the photogenerated holes are efficiently captured and consumed by the aluminum foil. This allows the photogenerated electrons to efficiently and specifically reduce high-valence metals in the cathode material, achieving enhanced leaching of valuable metals. This invention is the first to utilize the inherent aluminum foil in the waste to construct an "intrinsic hole consumption channel," improving light energy utilization and valuable metal leaching efficiency without the need for external photocatalysts or hole-consuming agents. It achieves efficient and green recycling of valuable metals such as lithium, cobalt, nickel, and manganese under lower acid consumption and milder conditions.

The present application belongs to the technical field of wastewater treatment, and particularly relates to a method for treating organic phosphonic acid wastewater by using a supported copper monatomic catalyst, wherein persulfate and the supported copper monatomic catalyst are added into the organic phosphonic acid wastewater to degrade the organic phosphonic acid; the supported copper monatomic catalyst is a metal oxide loaded with copper monatomic atoms, wherein the loading amount of the copper monatomic atoms is 1-10 wt% of the total weight of the catalyst. Compared with the prior art, the present application solves the problem that metal ions cannot be recovered in the advanced oxidation process of the prior art in the treatment of organic phosphonic acid wastewater. The present application provides an advanced oxidation technology for organic phosphonic acid wastewater, realizes efficient and deep degradation of the organic phosphonic acid in the wastewater, can adapt to wastewater in a wide pH range, and has strong anti-interference and high selectivity after multiple degradation, with a very low metal leaching content (0.0015 mg / L).

The invention relates to the technical field of waste plastic recovery and electrochemical energy storage, and discloses a preparation method and application of a ternary MOF based on waste lithium battery oxide derivation, and the preparation method comprises the following steps: step 1, taking a waste PET plastic bottle as an organic ligand precursor, taking a nickel cobalt manganese oxide obtained by disassembling a waste ternary lithium battery as a metal source, and adding N, N-dimethyl formamide into the organic ligand precursor; adding nitric acid into a N, N-dimethylformamide / water mixed solvent to adjust the acidity and promote the leaching of metal ions; according to the preparation method and application of the ternary MOF based on waste lithium battery oxide derivation, a waste PET plastic bottle is used as an organic ligand precursor to be combined with nickel-cobalt-manganese oxide in a waste ternary lithium battery, the ternary MOF is directly synthesized through a hydrothermal method, high-value utilization of two types of typical solid waste is achieved, and the method is suitable for industrial production. Valuable metals such as nickel, cobalt and manganese in the waste lithium battery are efficiently recycled, and the metal leaching and coordination efficiency is remarkably improved.

The invention relates to the technical field of precious metal extraction, in particular to a method for enriching platinum and palladium from a material containing high copper and sulfur. Oxidizing roasting; leaching with hydrochloric acid; copper precipitation treatment and ammonium chloride precipitation. In the oxidizing roasting stage, roasting is conducted in the oxygen atmosphere, the interference of sulfur on follow-up platinum and palladium enrichment is effectively reduced, a pretreated material and lead oxide are mixed according to the specific mass ratio, platinum and palladium elementary substances are converted into composite oxide easily dissolved in hydrochloric acid, and follow-up leaching of platinum and palladium is facilitated; in the hydrochloric acid leaching link, platinum, palladium and copper in the roasted product are fully dissolved, and the metal leaching rate is increased; during copper deposition treatment, iron powder is added according to the accurate molar ratio of the iron powder to copper ions, the copper ions are converted into copper slag precipitates, and efficient separation of copper, platinum and palladium is achieved; in the ammonium chloride precipitation step, ammonium chloride is accurately added according to the total molar weight of platinum and palladium in the filtrate, so that platinum and palladium are fully precipitated, and crude platinum and palladium products are obtained.

The application provides a kind of alkali leaching recovery method of waste oxide battery positive material, comprising: with the mixed aqueous solution of glycine, alkali and oxalate as the alkali leaching bottom solution, adding waste oxide battery positive material, soluble ferrous salt into the alkali leaching bottom solution, and carrying out leaching reaction. The method can realize the reduction of high-valence metal in oxide waste lithium ion battery positive material by using the reducing property of ferrous ion, can effectively improve the leaching efficiency of valuable metal, shorten the time of alkali leaching, and obtain higher metal leaching rate. And the leaching method can effectively avoid the entry of iron ion into liquid phase in the leaching process, causing a series of problems such as difficult separation of valuable metal in subsequent process, the reagent used is simple, the method condition is simple and easy to control, the energy consumption is low, the efficiency is high, and it has considerable industrial application prospect.

This invention discloses a stable nalmefene hydrochloride injection and its preparation method, relating to the field of biomedical technology. The injection consists of nalmefene hydrochloride, sodium chloride, hydrochloric acid, and water for injection, and contains no metal ion chelating agents, with a pH value controlled between 3.5 and 3.6. The method includes: preparing the solution and adjusting the pH under high-purity nitrogen protection in a solution preparation system with low metal ion introduction risk; filtering the solution through a polyethersulfone membrane with low metal leaching, and then filling it into ampoules with a vulcanized inner surface. This invention, through the systematic integration of multiple measures such as source control of the solution preparation system, inert atmosphere protection, precise pH control, surface passivation of packaging materials, and the use of high-purity materials, synergistically inhibits the metal ion catalytic oxidation of the active ingredient, ensuring that the content of the key degradation impurity II (2,2'-bisnalmefene) remains stably below the quality standard during long-term storage, solving the problem of chemical stability control of products in chelator-free formulations, and combining safety and process robustness.

The invention discloses a method for synthesizing mesalazine and application of mesalazine. The method comprises the following steps: introducing p-nitrophenol, formic acid and a Cu-Co-coated MFI-NS molecular sieve catalyst into a continuous flow reaction zone, and sequentially carrying out electrophilic substitution and nitro hydrogenation cascade reaction at normal pressure and 50-70 DEG C; the catalyst has a micropore-mesopore stepped pore channel, and contains a Cu0 metal cluster and a framework Co < 2 + > acid site. And separating, acidifying and crystallizing the reaction liquid to obtain a finished product. According to the invention, the shape-selective selectivity and difunctional synergistic effect of the molecular sieve are utilized, high conversion rate (gt, 98%) and high selectivity (gt, 94%) under mild conditions are realized, the product purity is greater than or equal to 99.5%, and the Cu / Co residue meets the ICHQ3D standard. The catalyst can be recycled for 10 times or more, the yield is reduced by 5% or less, iron mud pollution of a traditional iron powder method and the metal leaching risk of a noble metal catalyst are thoroughly eliminated, and the method has the remarkable advantages of being environmentally friendly, efficient, low in cost, easy to industrially amplify and the like and is suitable for preparing the medicine for treating the inflammatory bowel disease.

This invention discloses a nitrogen-doped carbon-based supported cobalt catalyst and its application in the degradation of hydroxyl-containing aromatic pollutants. Targeting hydroxyl-containing aromatic pollutants, this invention uses specific conditions to prepare a nitrogen-doped carbon-based supported cobalt catalyst for activating persulfate and degrading specific organic pollutant systems. It establishes a coordination anchoring effect between cobalt and nitrogen-containing sites, improving carbon framework defects and electron transport capabilities, while reducing the risk of metal leaching. This effectively improves catalytic performance and selectivity, achieving efficient activation of persulfate under near-neutral conditions to achieve efficient degradation of hydroxyl-containing aromatic pollutants.

This invention belongs to the field of precious metal recycling technology and provides a method for efficient photocatalytic recovery of platinum group metals from catalysts and its application. The method includes the following steps: mixing spent catalyst pulverizer and metal powder, performing mechanochemical treatment, and then adding an acid solution for reaction to obtain a modified spent catalyst; mixing the modified spent catalyst with a leaching solution to obtain a suspension, then irradiating the suspension with ultraviolet-visible light for photocatalytic reaction and filtering to obtain a platinum group metal leaching solution and leaching residue; adjusting the pH of the platinum group metal leaching solution, adding an oxidant, and then using an extractant to extract and separate transition metal chlorides to obtain a platinum group metal solution. This invention employs mechanochemical activation while simultaneously regulating the platinum group metal particles to generate a plasma resonance effect. This invention utilizes the strongly redox active species generated by the photocatalyst under light conditions, which are then converted into soluble compounds through complexation, achieving efficient leaching and recovery.

The invention provides a photoresponsive deep-eutectic solvent, a preparation method thereof, a leaching agent and application of the leaching agent. The photoresponsive deep-eutectic solvent comprises choline chloride, ethylene glycol, a photoresponsive additive, electrolyte salt and a low-viscosity solvent. The photo-responsive deep eutectic solvent provided by the invention not only has photo-responsiveness, but also has higher conductivity and lower viscosity; dynamic aggregation and dynamic flow characteristics under light driving can be synergistically enhanced, light-operated enhancement and dynamic regulation and control of solvent performance in the three-rare-metal leaching process can be achieved, the interfacial ion migration rate and diffusion efficiency can be improved, the mass transfer efficiency and leaching efficiency can be synergistically improved, and the separation difficulty after leaching is reduced.

The invention belongs to the technical field of marine mineral resource development, and relates to a method for extracting valuable metals from deep-sea polymetallic nodules through chloridizing roasting. According to the method, the deep-sea polymetallic nodule and the chlorinating agent are mixed according to a specific proportion and then roasted, so that valuable metals such as manganese, nickel, cobalt and copper in the manganese nodule are converted into soluble chlorides, and then a water leaching process is adopted, so that efficient extraction of various valuable metals in the deep-sea polymetallic nodule is realized; the technology which is low in roasting temperature, high in chlorinating agent utilization rate, high in metal leaching rate, short in process and low in pollution emission is obtained, and the technology has important economic and social benefits of promoting green development of deep sea resources and relieving strategic metal supply and demand contradiction.

The invention belongs to the technical field of harmless treatment and resource utilization of municipal sludge, and particularly relates to a method for preparing a sludge-based phosphorus-rich biochar material through Fenton modification. Aiming at the problems of low phosphorus fixation rate, high heavy metal leaching risk and the like in sludge treatment in the prior art, the method comprises the following steps: performing Fenton modification on sludge according to a TOC (Total Organic Carbon) value, and performing pyrolysis and calcination on the modified sludge at 500 DEG C and 700-900 DEG C in sequence to obtain the phosphorus-rich biochar. The heavy metal leaching rate of the phosphorus-rich biochar prepared by the method is greatly reduced, meanwhile, the phosphorus fixation rate is increased, and the method has remarkable progress.

The invention provides a method for strengthening leaching of valuable metal in a high-nickel lithium battery through mechanochemical coupling transient heat treatment, and particularly provides a method for recycling the valuable metal in a waste high-nickel ternary lithium ion battery. And then transient heat treatment is carried out in a Joule heat high-temperature heat field, so that the lithium component in the high-nickel positive electrode material can be transformed into lithium silicate, and meanwhile, the transition metal oxide is transformed into low-valence or simple substances.

The invention discloses a harmless and resourceful treatment process for household garbage incineration fly ash, and relates to the technical field of fly ash resourceful utilization. The process comprises the following steps: efficiently removing soluble chlorine salt in fly ash through a circulating thickening washing system to obtain dechlorinated fly ash and salt-containing wastewater; the method comprises the following steps: carrying out thickening circulation reuse on salt-containing wastewater, carrying out quality-divided crystallization evaporation on a thickening mother solution to recover salt, dehydrating a precipitate / filter-press solid, and then doping the dehydrated precipitate / filter-press solid into a dechlorinated fly ash system to realize closed-loop circulation; adding a chelating agent with a specific formula into the dechlorinated fly ash, and curing to stably cure heavy metals; the cured fly ash is subjected to heat treatment in a rotary kiln at the temperature of 600-900 DEG C for 10-30 min so as to decompose solid-phase dioxin and promote mineralization; after dioxin and semi-volatile organic compounds enter the flue gas pipeline, the dioxin and the semi-volatile organic compounds are quenched to 200 DEG C or below so as to inhibit regeneration. According to the method, the synergistic effects of heavy metal leaching standard reaching, dioxin control and fly ash resource utilization are achieved.

The present invention relates to a method for reducing the moisture content of Fe / Al residues generated in a waste lithium secondary battery recycling process and to Fe / Al residues produced thereby. More specifically, the invention relates to a method for producing Fe / Al residues with a moisture content of 50% by weight or less by applying a caustic soda slurry, prepared by diluting caustic soda with a solution containing a metal salt, to a valuable metal leaching solution to neutralize, precipitate, and wash away Fe and Al components.

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.