227 results about "Metal leaching" patented technology

The invention discloses lithium battery recycling material powder as well as a preparation method and application thereof, and relates to the technical field of battery recycling. The lithium battery recovery material powder comprises metal compound powder and an elemental carbon material, and the metal compound powder comprises at least one of the following elements: lithium, nickel, cobalt, manganese and iron; the separation index S of the lithium battery recovery material powder is greater than or equal to 0.15 m < 2 > / kg and less than or equal to 43 m < 2 > / kg, S = WDOC * BET, WDOC refers to the mass percent of soluble organic carbon in the lithium battery recovery material powder, and the soluble organic carbon refers to organic carbon which can be dissolved or dispersed in an aqueous solution with the pH value of 1-14; bET refers to the specific surface area of the lithium battery recovery material powder. The separation efficiency is high when the positive electrode material and the negative electrode material in the lithium battery recycled material powder are separated, and when the lithium battery recycled material powder is subjected to hydrometallurgy to extract valuable metal, the good metal leaching rate is achieved in the acid leaching stage.

The invention discloses a deep learning and automatic control chemical reactor and a resource recovery method, and relates to the technical field of hydrometallurgy, and the deep learning and automatic control chemical reactor comprises a chemical reactor, a motor, a heating device, a monitoring device, a data center and a PLC control system. Based on a PLC control system, a Transform-LSTM time sequence prediction model is integrated, so that real-time monitoring of parameters such as mixed liquid temperature, reaction chamber pressure, mixed liquid viscosity, conductivity and the like in a wet leaching reaction process can be realized; and the heating power of the heating device, the rotating speed of the motor, the raw material adding amount of the feeding port, the mixed material discharging time of the discharging port and the air displacement of the air exhaust port can be automatically and accurately controlled. The problems that stirring efficiency is low, parameter regulation and control are lagged, and manual experience is relied on are solved, through a predictive control strategy, the real-time monitoring and dynamic regulation level is remarkably improved, the wet leaching process is optimized, energy consumption is reduced, the high-grade metal leaching efficiency is improved, and the method is suitable for various wet metallurgy processes.

The invention discloses an electro-catalytic material of carbon fiber anchored bimetallic nanoparticles as well as a preparation method and application of the electro-catalytic material. The preparation method comprises the following steps: dissolving an iron source and a manganese source in an organic solvent, adding an organic polymer, and uniformly stirring to obtain a precursor solution; carrying out electrostatic spinning by using the precursor solution, pulling the organic high polymer into a jet flow shape by an electric field and solidifying, and anchoring metal in situ in a fiber precursor; and sequentially carrying out pre-oxidation and carbonization treatment on the fiber precursor to obtain the electrocatalytic material of the carbon fiber anchored bimetallic nanoparticles. The electrocatalytic material disclosed by the invention has the advantages of multiple active sites, good cycling stability, low metal leaching amount and the like. The electrocatalytic material disclosed by the invention can realize efficient electrocatalytic degradation of organic pollutants in water, and has the advantages of strong anti-interference capability, wide application range and the like.

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 relates to the technical field of non-ferrous metal resource recycling, in particular to an efficient lead and silver chemical separation method. The invention discloses an efficient lead and silver chemical separation method. The method comprises the following steps of acid solution leaching treatment, silver extraction agent extraction treatment, reducing agent reduction treatment, alkali solution dissolution treatment and precipitating agent or oxidizing agent precipitation treatment. According to the efficient lead and silver chemical separation method, copper, zinc, iron and other metals in the lead and silver residues are leached into the solution through the acid solution, then lead is leached into the solution through the alkali solution, efficient separation of lead and silver is achieved, the lead and silver separation efficiency can reach 90% or above, the lead and silver are made into corresponding products, the purity of the lead and silver products is high, the economic value is high, and the method is suitable for industrial production. And secondary pollution is avoided, the application range is wide, various lead-containing materials can be treated, resource waste is reduced, energy consumption is low, and the method is suitable for large-scale production.

The invention belongs to the technical field of metal leaching, and provides a method for leaching valuable metals in waste lithium battery black powder, which comprises the following steps of: classifying acid leaching slag samples according to the existence of residual valuable metal insoluble compounds and the distribution concentration degree of the residual valuable metal insoluble compounds; whether the alkaline leaching reaction is optimized or not is judged according to the proportion number of the acid leaching indissolvable samples and the indissolvable concentrated samples in the acid leaching residue samples, and therefore the leaching extraction effect of the valuable metal is guaranteed. The convergence of the valuable metal leaching change curve is analyzed through the constructed valuable metal leaching change curve under different reaction times, so that whether the optimized alkaline leaching reaction time can meet the feasibility of effective leaching of the valuable metal or not is preliminarily judged, and if yes, according to the content and the type of newly added metal elements in the optimized time period, the effective leaching of the valuable metal is determined according to the content and the type of the newly added metal elements in the optimized time period. And after the alkaline leaching reaction time is optimized, the effective leaching feasibility of the valuable metal is finally determined, and the leaching effect of the valuable metal is further improved.

The invention discloses a method for recycling zinc smelting tailings, which comprises the following steps of: sieving the dried zinc smelting tailings, classifying and sampling, leaching coarse fraction by hydrochloric acid to obtain a leaching solution I and lead chloride slag, mixing the leaching solution with fine fraction tailings, adjusting the pH value of the solution to be neutral to obtain neutralized slag and neutralized liquid, and recycling the neutralized slag and the neutralized liquid. The neutralized liquid is subjected to replacement to obtain replacement slag and a replacement liquid, the replacement liquid is subjected to iron removal purification electrodeposition casting to obtain a zinc ingot, the replacement slag is subjected to acid leaching again to obtain copper slag and a leaching solution, and the germanium-gallium-indium leaching solution is subjected to extraction and electrolytic refining to obtain germanium concentrate, metal gallium and metal indium; the lead chloride slag is leached through sulfuric acid to obtain lead sulfate slag, the lead sulfate slag is subjected to pyrogenic process lead smelting to recover lead metal, a leaching solution II is subjected to hydrochloric acid and sulfuric acid separation, and a sulfuric acid solution and a hydrochloric acid solution are obtained and can be recycled. The method is high in recovery rate and low in production cost, and the purposes of low-pollution, low-carbon and economical industrial production and rare and precious metal recycling are achieved.

The invention discloses a method for strengthening leaching of valuable metals in a waste lithium battery positive electrode material, and relates to the field of waste battery material recovery, and the method comprises the following steps: S1, obtaining a positive electrode plate of a waste lithium battery, and crushing to obtain positive electrode active powder; s2, the three-necked flask is placed in a water bath ultrasonic pot, a left side opening is used for placing a condensation pipe, a central opening is used for placing a stirrer, and a right side opening is used for adding a medicament; s3, adding organic acid into the three-necked flask through a right side opening, and sequentially adding silicon dioxide, metal salt and positive electrode active powder to obtain a mixed solution; s4, uniformly mixing the medicaments in the step S3 by using a water bath ultrasonic pot and a stirrer, and obtaining reacted liquid after the reaction is finished; s5, carrying out solid-liquid separation on the reacted liquid in the step S4, and washing for multiple times to obtain separated solid and liquid; and S6, a set amount of nitric acid is added into the liquid obtained in the step S5, metal hydrolytic precipitation is prevented, then deionized water is used for fixing the volume to 1 L, and leaching liquid containing metal cobalt and lithium is obtained.

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 gluconobacter oxydans for leaching waste printed circuit boards and a leaching method of the gluconobacter oxydans, and belongs to the technical field of microbial resource recovery treatment, lixivium for leaching extraction comprises the gluconobacter oxydans, metabolites of the gluconobacter oxydans and an H2O2 solution, and the H2O2 solution is added to improve the metal leaching percentage and shorten the leaching time. Compared with traditional chemical and biological leaching, efficient leaching of the metal copper in the waste printed circuit board is achieved under the relatively mild condition, safety is higher, and secondary pollution to the environment can be relieved.

The invention relates to the technical field of lithium ion battery recovery and wastewater treatment, and discloses a method for recovering valuable metals in waste lithium batteries and synchronously degrading antibiotics in water. The method comprises the following steps: adding a waste lithium battery positive electrode material and an oxidizing agent into antibiotic wastewater, and reacting to obtain a positive electrode metal leaching solution; adjusting the pH value of the anode metal leachate to 9-14, and carrying out solid-liquid separation to obtain a lithium-rich filtrate and a transition metal precipitate; and adding a precipitator into the lithium-rich filtrate, carrying out precipitation reaction, and collecting a lithium-rich precipitate. According to the method provided by the invention, based on an advanced oxidation process, the transition metal in the positive electrode material of the waste lithium battery can be oxidized and dissolved by an oxidizing agent to recover metal resources, and can also be used as a catalyst to activate the oxidizing agent to generate free radicals and degrade antibiotics, so that metal recovery and pollutant degradation are synchronously completed in a single system; the method is easy to operate, co-treatment of urban solid waste and wastewater is promoted, and good ecological environmental benefits are achieved.

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 relates to the technical field of battery recovery, particularly provides a method for recovering valuable metals from waste lithium batteries, and aims to solve the problem of complex recovery procedures caused by high residual acid concentration and high impurity content in the existing recovery process. The method for recycling the valuable metal from the waste lithium battery comprises the following steps: S1, performing sulfating roasting on positive electrode powder of the waste lithium battery to obtain a roasted material; s2, adding water into the roasted material for dissolving, and carrying out solid-liquid separation to obtain lithium extraction slag and a lithium-rich solution; s3, a leaching agent solution is added into the lithium extraction slag, valuable metal leaching is carried out, leaching liquid is obtained, and the leaching agent solution at least comprises ammonium salt and a reducing agent; and S4, an oxidizing agent is added into the lixivium, impurity ions in the lixivium form precipitates, filter residues are removed, and the valuable metal solution is obtained. According to the method, valuable metal can be efficiently leached, the problems of too high residual acid content and too high impurity content can be avoided, and the recovery process is simplified.

The invention belongs to the field of battery material recovery, and particularly relates to a total leaching method of a waste lithium ion battery positive electrode active material, which comprises the following steps: mixing a waste positive electrode material separated from a waste lithium ion battery with an aqueous solution containing a leaching agent with a formula 1 # imgabs0 #, leaching, and carrying out solid-liquid separation to obtain a leaching solution enriched with metal ions in a material to be treated. Researches show that the compound in the formula 1 is combined with the concentration and the temperature, so that crystals and physical and chemical structures of the compound can be quickly misunderstood without assistance of other leaching aids, and efficient and mild total metal leaching of the positive electrode material can be realized. In addition, according to the leaching method, leaching impure phases cannot be introduced, the physical and chemical performance of the regenerated material can be accidentally optimized, and the regenerated material with excellent performance can be obtained through regeneration.

The invention discloses a preparation method and application of a three-dimensional hierarchical ordered mesoporous zeolite confinement NiCo alloy catalyst, and belongs to the technical field of catalytic upgrading of lignin model compounds. According to the catalyst, a bimetallic active component is formed through metal Ni and Co, a coating confinement is formed on the active component in the process of synthesizing the three-dimensional graded ordered mesoporous 3DZSM-5 zeolite, and the prepared catalyst is small in metal particle size and high in dispersity. The existence of the three-dimensional graded ordered mesopores is beneficial to contact, diffusion and transfer of reactants in pore channels. The catalyst prepared by the preparation method disclosed by the invention is used for preparing 2-methoxy-4-methylphenol by hydrodeoxygenation of vanillin, and shows excellent catalytic performance. Almost no metal is leached in the catalyst circulation process, the subsequent separation is simple and convenient, the cost is low, and industrial production is facilitated.

The present invention discloses the system and method of preparation of a surface-modified crystalline blend to enhance the properties of water by optimizing its mineral composition, alkalinity, and bioavailability. The crystalline blend comprises Tourmaline, Shungite, Jade, Silica, Zeolite, Lava Stones, and Calcareous Shale, with additional minerals like Maifan, Calcite, and Dolomite to enhance water quality. The invention utilizes Bioactive Crystal Resonance Technology (BCRT), wherein individual minerals are heated below their phase transition temperature to activate them while maintaining their crystalline state providing controlled activation and ensuring a regulated release of beneficial minerals, preventing excessive increases in pH or TDS levels while significantly reducing heavy metal leaching. The system includes a perforated membrane leveraging irregularly shaped crystals ranging from 0.5 to 5mm, allowing water to interact with the modified minerals to restore essential nutrients, increase hydration efficiency, improve detoxification, alkaline water, and provide antioxidant benefits.

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.

A method for bringing battery powder resulting from lithium ion battery waste into contact with an acidic leaching solution 21 inside a leaching vessel 1 to leach metals contained in the battery powder into the acidic leach solution 21, wherein the leaching vessel 1 includes a porous member 2 disposed to cover a liquid surface 22 of the acidic leaching solution 21 stored therein at a position above the liquid surface 22, the method includes destroying froth Ba generated in the acidic leaching solution 21 by bringing them into contact with the porous member 2 during leaching of the metals inside the leaching vessel 1, and the porous member 2 has an opening of 12 mm or less.

The invention relates to the technical field of lithium battery recovery, in particular to a method for producing cobalt oxide by recovering waste lithium batteries and recycling mother liquor in the production process. Comprising the following steps of lithium cobalt oxide battery disassembly and pretreatment, valuable metal leaching, extraction separation, hydroxyl cobalt oxide production and mother liquor recycling treatment. Citric acid and hydrogen peroxide are used as valuable metal leaching agents, efficient leaching of valuable metal such as lithium and cobalt can be achieved, dependence on strong acid is reduced, and safety risks and environmental pollution in the recovery process are reduced. The cobalt sulfate solution obtained by recycling the waste lithium cobalt oxide batteries is used for producing and preparing the hydroxyl cobalt oxide, after the hydroxyl cobalt oxide is obtained, the residual mother liquor contains a sodium hydroxide component, the mother liquor is subjected to impurity removal treatment, the recyclable alkali liquor can be obtained, the recyclable alkali liquor can be used as saponification liquid alkali to be used in the extraction separation step, resource waste is reduced, and the resource utilization rate is increased. The resource recycling rate is improved.

A method for bringing battery powder resulting from lithium ion battery waste into contact with an acidic leaching solution 21 inside a leaching vessel 1 to leach metals contained in the battery powder into the acidic leach solution 21, wherein the leaching vessel includes a movable member operably disposed at a position above a liquid surface 22 of the acidic leaching solution 21 stored therein, and the method includes destroying froth Ba generated in the acidic leaching solution 21 by operation of the movable member.

The invention discloses a resourceful treatment method for crude lead smelting smoke containing indium, germanium, tin and antimony, and belongs to the technical field of comprehensive utilization of crude lead smelting smoke. Firstly, the crude lead smelting smoke is pulpified with a crude hydrochloride solution, then sulfuric acid is injected for curing, then dilution leaching is conducted, leaching residues are fed into crude lead smelting ingredients, and the crude lead smelting ingredients are obtained; transferring the leachate into a selective extraction separation system to selectively extract and separate tin, germanium and indium to respectively obtain tin oxide concentrate, germanium oxide concentrate and crude indium, selectively reducing and precipitating cadmium in indium extraction raffinate to obtain sponge cadmium, briquetting and casting to produce crude cadmium, concentrating the cadmium-removed raffinate with a membrane, and promoting cold crystallization by ethanol to separate out zinc sulfate crystals, and evaporating the mother liquor to remove ethanol, regenerating a crude hydrochloride solution, and returning to leach for use. The method comprehensively recovers seven metals including lead, antimony, tin, germanium, indium, cadmium and zinc, is high in separation coefficient, simple and smooth in process, low in investment, high in benefit, relatively good in industrial application value, high in metal leaching rate and recovery rate and low in treatment energy consumption, and basically realizes zero emission of three wastes.

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.

The invention discloses an oxidizing agent production system for a precious metal leaching process. The oxidizing agent production system comprises a mother liquor storage barrel, an electric synthesis device, a primary activation device, a product solution storage barrel, a filtering and concentrating device and an evaporative crystallization device which are connected in sequence. By adopting the production system provided by the invention, the activation property of the oxidant product is improved.

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.