33 results about "Copper leaching" patented technology

A system for dynamic oxidation of a heap of copper ore includes a “process island” for formulating and dispensing oxidizing reactive mixtures having predetermined compositions, and irrigating the heap with the mixtures to progressively transform the ore and maintain conditions for enhanced recovery of metal by heap leaching, solvent-extraction and electrowinning. In embodiments, the system is adapted to obtain copper metal from the refractory copper mineral chalcopyrite.

An electric motor lubricating fluid for an electric motor system includes a lubricating base oil, a tolyltriazole resist, an oil-soluble phosphorus antiwear additive, and a sulfonate detergent in an amount such that effective performance in terms of copper leaching and extreme pressure wear is facilitated when tolyltriazole is present.

The invention relates to the technical field of metallurgy and chemical engineering, and particularly discloses an electrolysis method for efficiently recovering copper from electroplating waste liquid / waste mud, which specifically comprises the following steps: copper leaching, purification and acid regulation, complexing iron removal, electrodeposition copper deposition and photocatalytic air flotation treatment. Wherein in the electrodeposition copper deposition stage, through the synergistic effect of a pulse power supply, pulse laser irradiation and a rotating cathode, the rotating cathode continuously conveys high-concentration copper ions to a cathode interface through the convection effect; the pulsed power supply reduces an electric crystallization nucleation energy barrier in cooperation with laser irradiation while increasing the deposition rate, and improves the copper deposition compactness. And high-speed and high-efficiency deposition of copper and high density and high purity of a cathode product are realized through cooperation of the three components. And in the photocatalytic air flotation treatment stage, a trace amount of residual copper in the copper-poor liquid is efficiently enriched through a bismuth tungstate photocatalytic reduction and new copper reagent selective complexing air flotation separation technology, and the total recovery rate of copper is increased.

The invention discloses a beneficiation-metallurgy combined process method for treating low-grade high-oxidation-rate copper ore. The beneficiation-metallurgy combined process method comprises the steps that the crushed low-grade high-oxidation-rate copper ore is divided into a part A, a part B and a part C according to the particle size; the part A is subjected to color sorting, and color-sorted concentrate is obtained; carrying out ore grinding and copper sulphide flotation on the color separation concentrate to obtain copper sulphide concentrate and sulfur separation tailings; and the copper sulfide concentrate, the sulfur separation tailings and the part C of ore are further treated to obtain copper-rich leachate. According to the method, coarse particles are partially and coarsely enriched through the color selector, the selection grade of the low-grade copper oxide ore is improved, a large amount of ore grinding loss is omitted, the situation that due to the low grade of raw ore, produced metal is less is avoided, and meanwhile the ore grinding and beneficiation cost is reduced; the beneficiation and smelting process can be flexibly selected according to the selectability of copper oxide in the ore and the content of acid-consuming gangue, acid consumption is reduced, and beneficiation and smelting economic benefits are improved.

This invention relates to a method for selectively and stepwise extracting antimony and copper from precious silver alloys using temperature-controlled oxygen enrichment. The method includes: blowing the precious silver alloy at 700–800°C with a mixed gas containing 25%–30% oxygen for low-temperature oxygen enrichment blowing to produce antimony-oxygen powder; heating the blown alloy to 950–1000°C, adding an alkaline covering flux, and then blowing oxygen-enriched compressed air to oxidize copper and residual antimony into slag, obtaining a gold-silver enriched alloy; crushing and ball-milling the obtained copper slag, then leaching it using a sulfuric acid system with the addition of persulfate oxidant, followed by pressure filtration to obtain a leachate and leaching residue; electrowinning the leachate to produce black copper; and returning the leaching residue to the pyrometallurgical smelting system to recover gold and silver. This invention achieves efficient separation and recovery of silver, antimony, and copper from precious silver alloys through a short-process coupled process of "low-temperature oxygen enrichment for antimony removal – high-temperature oxygen enrichment for copper slag production – oxidative acid leaching for copper recovery," offering advantages such as high antimony ash grade, good copper slag enrichment, high copper leaching rate, and low precious metal loss.

An electric motor lubricating fluid for an electric motor system including a lubricating base oil, a tolyltriazole corrosion inhibitor, an oil-soluble phosphorus antiwear additive, and a sulfonate detergent in amounts to facilitate effective performance in copper leaching and extreme pressure scuffing when in the presence of the tolyltriazole.

The invention relates to the technical field of hydrometallurgy, in particular to a method for enhancing microbial leaching of secondary copper sulphide ore of polymetallic ore by using a surfactant. The method for enhancing microbial leaching of the secondary copper sulphide ore of the polymetallic ore by using the surfactant comprises the following steps: S1, crushing and grinding the secondary copper sulphide ore of the polymetallic ore in sequence to obtain an ore leaching sample; s2, the ore leaching sample is added into a 9K basic salt solution, and ore pulp is obtained; fe < 2 + > is added into the ore pulp, and strains are inoculated; the strain comprises domesticated thiobacillus ferrooxidans; and S3, after the strains are inoculated, Span 80 is added for leaching. According to the method, the Span 80 is added into the leaching system of the secondary copper sulphide ore of the polymetallic ore, the copper leaching rate is remarkably increased, the leaching period is shortened, and the method has the advantages of being easy and convenient to operate, low in cost, low in energy consumption, environmentally friendly and the like.

The utility model relates to an efficient separation and comprehensive recovery system based on copper-nickel complex platinum-palladium concentrate. The system comprises a smelting furnace, and an outlet of the smelting furnace is sequentially connected with a 1 # converting furnace, a 2 # converting furnace, a stage temperature control cooling furnace, a grinding system and a low-intensity magnetic field pulse high-gradient magnetic separator; an outlet of the low-intensity magnetic field pulse high-gradient magnetic separator is connected with a normal-pressure acid leaching system and a 2 # filter, an outlet of the normal-pressure acid leaching system is sequentially connected with a 1 # filter and a nickel sulfate crystallization system, and an outlet of the 2 # filter is sequentially connected with a roasting furnace, a copper leaching tank, a 3 # filter and a copper sulfate crystallization system; outlets of the nickel sulfate crystallization system and the 3 # filter are connected with a nickel smelting furnace; and an outlet of the nickel smelting furnace is connected with a nickel electrolysis system. The system can efficiently separate and recover valuable metals such as platinum, palladium, gold, silver, copper, nickel and cobalt in the complex platinum-palladium concentrate, is good in separation effect and high in comprehensive recovery rate, fully realizes comprehensive recycling of resources, and has relatively good economic benefits and social benefits.

The present application relates to the technical field of waste metal recycling, and specifically provides a selective leaching method for copper in waste circuit boards, comprising the following steps: mixing pretreated waste circuit board raw materials with a methyl sulfonic acid solution, setting a first reaction temperature and adding a strong oxidizing agent and a metal inhibitor for reaction, continuing the reaction at a second reaction temperature after the reaction is completed, and separating to obtain a copper-rich leaching solution and a leaching residue. The present application realizes efficient and selective leaching of copper by precisely controlling the leaching system, so that the target metal enters the solution phase, and other impurity metals are enriched in the leaching residue in the form of precipitation.

The invention discloses an ammonia leaching process of copper oxide ore, which comprises the following steps: crushing and grinding the copper oxide ore, adding an activating agent into the obtained ore pulp for activating treatment, sequentially adding ammonia liquor and sulfide for leaching treatment and precipitation reaction, and filtering, and copper sulfide concentrate and filtrate are obtained. Compared with a conventional ammonia leaching process, the ammonia leaching process of the copper oxide ore has the advantages that the copper oxide ore is sequentially subjected to crushing, ore grinding, activating treatment, leaching treatment and precipitation reaction, the copper leaching rate of the copper oxide ore can be remarkably increased, meanwhile, agent consumption and environmental pollution are reduced, and the ammonia leaching process is suitable for efficient recovery of complex and difficult-to-treat copper oxide ore; the method has the advantages of simplicity in operation, low cost, high leaching efficiency, good leaching effect, environmental friendliness and the like, and is high in use value and good in application prospect.

A high-silicon copper-containing calcine leaching residue resource utilization method, comprising: mixing high-silicon copper-containing calcine leaching residue with solid strong alkali, roasting at 140-160 DEG C, obtaining roasting alkali residue; the roasting alkali residue is added with calcium oxide and water to carry out concentrated alkali leaching, solid-liquid separation, obtaining alkali leaching residue and alkali leaching liquid; the alkali leaching liquid is added with a sulfidation agent to precipitate copper, obtaining copper precipitation residue and copper precipitation liquid; the copper precipitation liquid is added with calcium oxide to remove silicon, obtaining silicon precipitation residue and silicon removal liquid; copper is enriched in the copper precipitation residue; the "low-temperature roasting + concentrated alkali leaching" process of the application can effectively destroy the stable structure of high-silicon copper-containing calcine leaching residue, so that the copper wrapped by silicon is exposed, the chemical reaction of the high-silicon copper-containing calcine leaching residue leaching process is significantly strengthened, and the copper leaching rate can be greatly improved; the roasting temperature of the application is only 140-160 DEG C, which is much lower than the general alkali roasting temperature, the energy consumption is lower, the possible high-temperature injury is reduced, and the safety is higher.

The invention discloses a production method for acid leaching, impurity reduction and electrodeposition of calcine, and belongs to the field of nonferrous metallurgy. The method comprises the following steps: step 1, carrying out high-temperature acid leaching treatment on copper-containing calcine to obtain a high-temperature copper-containing leachate; 2, the high-temperature copper-containing leaching solution obtained in the step 1 is subjected to crystallization and impurity reduction treatment, and a solid crystallization substance is obtained; and 3, the solid devitrification substance obtained in the step 2 is subjected to crystal dissolving and electrodeposition process treatment, and cathode copper is obtained. According to the method, an extraction process with high cost is removed, meanwhile, metal impurities, organic matters and suspended matters in the solution are greatly reduced, and a high-quality cathode copper plate can be formed. The method is simple in technological process, low in price and low in cost, and has no restriction on roasting conditions.

The present application relates to non-ferrous smelting technical field, specifically to a kind of tellurium slag comprehensive recovery method, steps include: tellurium slag is broken, ball milling to 100 mesh below particle size, by sulfuric acid leaching, leaching solution recovers copper, leaching residue is oxidized by hydrochloric acid and leaching, leaching solution is purified and recovered selenium tellurium by impurity removal, leaching residue is recovered gold and silver by water washing and neutralization and oxygen gas inclined-blowing rotary converter.The tellurium slag comprehensive recovery method disclosed in the present application, copper and tellurium in tellurium slag are leached into liquid phase in two stages, lead, gold and silver are in slag phase, so that copper and tellurium are effectively separated from lead, gold and silver, and the leaching rate of copper and tellurium is more than 90%, gold and silver are enriched in slag phase, which can be matched with pressurized copper removal anode mud into oxygen gas inclined-blowing rotary converter.The tellurium slag comprehensive recovery method disclosed in the present application can effectively recover copper, tellurium, gold, silver and other metal elements in tellurium slag, has the advantages of high treatment efficiency, and is worth popularization and application.

A hydrometallurgical system for processing metal ore includes a dynamic oxidative step in which the ore is irrigated with specific reactive liquid mixtures at low flow rates to progressively transform the ore and maintain conditions for enhanced recovery of metal from the ore by solvent-extraction / electrowinning. In embodiments, the systems described herein may be used for obtaining copper metal from refractory copper sulfides. A heap subjected to the electrochemical regimes established and maintained in the heap using these methods exhibit novel kinetics.

The application provides a method for regulating copper extraction in a low-grade primary copper ore bioleaching process, which comprises the following steps: adopting leaching bacteria (Leptospirillum sp. and Acidiphilium sp., the relative abundance is greater than or equal to 20% and 10% respectively) to perform first cycle leaching on a low-grade primary copper ore; adjusting (increasing) the leaching temperature after the first cycle leaching reaches the maximum leaching limit; adopting thermophilic leaching bacteria (Sulfobacillus sp., the relative abundance is greater than or equal to 15%) to continue the second cycle leaching on the low-grade primary copper ore until the leaching endpoint is reached. The application effectively improves the bioleaching efficiency of chalcopyrite mineral phase in the second cycle leaching process by regulating the bioleaching process in stages, and solves the problems of low chalcopyrite mineral phase dissolution rate and low total copper leaching rate in the primary copper ore in the process of leaching the primary copper ore by using conventional wet leaching and bioleaching methods. In addition, the application adopts an extraction iron removal method to control the concentration of ferric iron generated in the leaching process, reduces the generation of the passivation layer on the surface of the ore, and accelerates the copper leaching rate.

The application discloses a method for recovering precious metals from lead matte, comprising the following steps: firstly, adding 2m3 of hydrochloric acid with a concentration of 2.0-2.5mol / L into a mechanical kettle 1 compartment, then adding lead matte powder with a particle size of 200-300 mesh obtained by crushing balls into a screw feeder, adjusting the screw frequency to 10-12Hz, controlling the feeding amount, opening a steam valve for auxiliary heating to 80℃, then closing the steam valve, opening a chlorine gas regulating valve for self-heating reaction, sampling and measuring the potential after 30 minutes of reaction to determine whether the potential is between 400-420mV, if the potential is lower than the range, the chlorine gas valve needs to be opened, if the potential is higher than the range, the chlorine gas valve needs to be closed, after the reaction is completed, the material flows from the mechanical kettle 4 compartment overflow port to a slurry storage tank, then solid-liquid separation is carried out, the leaching residue is subjected to desulfurization by sodium sulfite, then solid-liquid separation and washing are carried out to obtain a precious metal concentrate, and the precious metal concentrate is sent to a purification process for separation and purification. The method has a precious metal enrichment rate of more than 95% in the lead matte, a nickel and copper leaching rate of more than 99%, and realizes waste utilization.

The present application belongs to the technical field of lithium ion battery, and provides a method for recovering copper in battery powder, which comprises the following steps: performing alkali leaching on the battery powder to obtain alkali leaching powder; performing low-temperature oxidative acid leaching on the alkali leaching powder to obtain leaching residue and primary acid leaching solution; performing oxidative acid leaching on the leaching residue to obtain secondary leaching residue and secondary leaching solution; and sequentially performing extraction and electrodeposition on the primary acid leaching solution to complete the recovery of copper. In the present application, the alkali leaching is used for removing aluminum in the battery powder, the low-temperature oxidative acid leaching is used for improving the lithium leaching rate and the iron and phosphorus precipitation rate, then the leaching residue is subjected to oxidative acid leaching again for comprehensively improving the copper leaching rate, the extraction is used for realizing the separation of copper and lithium, and the electrodeposition for copper extraction is used for recovering copper, which can effectively improve the economic value.

The invention discloses a normal-pressure acid leaching process for valuable metals in pyrometallurgy soot, and belongs to the technical field of metallurgy. The process comprises the following steps: crushing the soot to be less than or equal to 100 meshes, preparing a 80-120g / L sulfuric acid solution according to a liquid-solid ratio of (4: 1)-(6: 1), adding a reducing agent (preferably sodium sulfite) which accounts for 8-12% of the mass of the soot, stirring and reacting for 4-6 hours at the constant temperature of 75-85 DEG C, and then carrying out solid-liquid separation. The core innovation lies in that the bottleneck of the traditional process is broken through through the coordinated regulation and control of acidity, liquid-solid ratio and reducing agent: (1) the zinc leaching rate is increased to 70-75%, and the copper leaching rate reaches 60-70%; (2) the iron leaching rate is inhibited to be less than or equal to 20%, and lead / iron is enriched in the slag (Pb is greater than or equal to 25%, and Fe is greater than or equal to 18%); and (3) the metal concentration of the leachate is obviously improved (Zn is greater than or equal to 9.5 g / L, and Cu is greater than or equal to 6.0 g / L). The process is easy to operate, low in cost and suitable for efficient recovery and impurity separation of zinc and copper in the nickel smelting soot.

The application provides a low-grade copper sulfide ore potential regulation bioheap leaching process, which comprises the following steps: copper phase composition analysis is performed on the ore of the low-grade copper sulfide ore, and the suitable range of the oxidation-reduction potential in the bioheap leaching process is determined according to the analysis result. Then, the ore is crushed to a particle size of 1000 mm, sulfuric acid is added and uniformly mixed, and stacking is performed; a culture medium is prepared, leaching bacteria composed of iron-oxidizing bacteria and sulfur-oxidizing bacteria are cultured, and inoculation is performed in the heap; by controlling the proportion of the iron-oxidizing bacteria and the sulfur-oxidizing bacteria in the leaching bacteria group, the aeration amount and the pH value in the heap, and the iron element concentration of the leaching solution, the oxidation-reduction potential of the heap leaching process is regulated to the suitable range of the oxidation-reduction potential, until the heap leaching is completed. According to the differences in the copper phase composition in different ores, the oxidation-reduction potential of the heap leaching process is adapted, so that the copper leaching rate and the copper leaching rate are improved, and the resource utilization of the low-grade copper sulfide ore is realized. Moreover, the process is simple in operation, low in cost, green and environment-friendly, and has a good application prospect.

The present invention is generally related to a novel catalytic composition and a method for the production of 1,4 -butynediol by catalytic ethynylation of formaldehyde, the said method is known as the Reppe reaction. The invented catalyst with lower copper content would provide an advantageous combination of improved utilization efficiency of copper, reduced copper leaching and enhanced filterability, and has minimal to no impact on catalytic activity.

The present application relates to the technical field of hydrometallurgy, and particularly to a method for strengthening microbial leaching of secondary copper sulfide ore of polymetallic ore by using surfactants, which comprises the following steps: S1, crushing and grinding secondary copper sulfide ore of polymetallic ore in sequence to obtain a leaching sample; S2, adding the leaching sample into a 9K basic salt solution to obtain a slurry; adding Fe 2+ into the slurry to access a bacterial strain; the bacterial strain comprises domesticated ferrous-oxidizing Thiobacillus; and S3, adding Span 80 for leaching after the bacterial strain is accessed. The method has the advantages of simple operation, low cost, low energy consumption, environmental friendliness and the like, since the copper leaching rate is significantly improved and the leaching period is shortened by adding Span 80 in the leaching system of secondary copper sulfide ore of polymetallic ore.

The invention discloses a leaching method for enhanced catalysis of bound copper ore, and relates to the technical field of copper ore leaching, the method comprises the following steps: carrying out wet ball milling on bound copper ore to 200 meshes, and adjusting the ore pulp concentration to 40%; under the stirring state, 10m < 3 > / h oxygen-enriched air is introduced through a Roots blower, a biomass particle steam generator is adopted for heating to 70 DEG C, and citric acid with the mass being 3% of the mass of the ore is added for enhanced catalytic pretreatment for 1.5 hours; then adding a sulfuric acid leaching agent with the concentration of 10%, and leaching for 3.5 hours, wherein the total process time is 5 hours; and after filter pressing separation, leaching liquid is replaced with iron powder with the purity being larger than or equal to 98% to generate spongy copper with the grade being larger than or equal to 85%, and after tailings are discharged in a dry mode, lime is added to adjust the pH to 7 for brick making. According to the method, through the synergistic effect of fine grinding, organic acid catalysis and oxygen-enriched heating, efficient dissolution of iron and manganese inclusion and copper mineral monomer dissociation are achieved, the copper leaching recovery rate is increased to 95% or above, the process is mild, reagents are cheap, operation is easy, tailings can be recycled, economical efficiency and environment friendliness are both considered, and the method is suitable for large-scale industrial application.

The invention relates to a method for recovering copper in micro-fine particle copper leaching residues through combination of precipitation and shear flocculation, which comprises the following steps: carrying out solid-liquid separation on the micro-fine particle copper leaching residues to obtain copper-ion-containing liquid and leaching residues without the copper-ion-containing liquid; carrying out iron removal and copper deposition on the copper-containing ionic liquid to obtain copper sulfide precipitate and copper-deposited liquid; and after size mixing is conducted on the leaching residues with the copper-containing ionic liquid removed, chemicals including a vulcanizing agent and a collecting agent are added, strong stirring is conducted, and leaching residue concentrate and flotation tailings are obtained through flotation. According to the method, agglomeration is induced through the combined action of the agent and strong stirring, the apparent particle size of the target mineral is remarkably increased, and the leaching residue concentrate rich in copper sulfide is obtained through flotation; and the technological process is simple, the operation requirement is low, the copper recovery rate is high, and efficient recovery of the micro-fine particle copper leaching residues is achieved.

The invention belongs to the technical field of non-ferrous metal metallurgy, discloses a method for selectively leaching lead from lead copper matte by using lead-targeted functionalized ionic liquid, and solves the problems of complex flow, high energy consumption, high environmental protection risk and the like caused by preferential leaching of copper and lagged recovery of lead in the prior art. The ionic liquid is a betaine or imidazole compound containing carboxyl, and comprises betaine hydrochloride / sulfonate and 1-carboxyethyl-3-methylimidazole chloride salt / sulfonate. The leaching method comprises the following steps: selecting one or more ionic liquids, and preparing a 1-5mol / L aqueous solution (single / mixed system) as a leaching agent; the lead copper matte and the leaching agent are mixed according to the solid-to-liquid ratio of 1: 8-1: 60 under the normal pressure, leaching is conducted for 0.5-3 h at the temperature of 40-90 DEG C and the speed of 100-500 r / min, lead leaching liquid and copper-rich slag are obtained through filtering, and under the optimal condition, the lead leaching rate is larger than or equal to 95%, and the copper leaching rate is smaller than or equal to 5%. Targeted leaching is achieved through specific coordination of the ionic liquid to lead ions, the process is simple and efficient, energy consumption is low, hydrogen sulfide emission is avoided, the method is suitable for resourceful treatment of lead matte and lead-copper paragenic ore, and benefits are remarkable.

This application relates to the field of hydrometallurgical zinc refining technology, specifically to a copper salt dechlorination recycling process for a hydrometallurgical zinc refining production line. In this process, after the zinc oxide raw material is neutrally leached to obtain a secondary leaching solution, chloride ion removal and copper salt recycling are achieved through a cyclic treatment process of "dechlorination-acid washing-alkali washing-rinsing-regeneration-copper precipitation-oxidation-copper leaching". Furthermore, an automated control system is added to the recycling process. Through real-time data acquisition and dynamic analysis of control deviations, the proportional parameters of the PI controller in the copper salt dechlorination recycling process of the secondary leaching solution are adjusted to improve the stability of dechlorination effect for different batches.

The utility model relates to a system of valuable component recovery from high copper iron complex gold extraction carbon calcination slag, including ball mill, the discharge outlet of ball mill is connected with the feed inlet of hydrocyclone through the ore pulp pump, the sand trap of hydrocyclone is connected with the feed inlet of ball mill, the overflow of hydrocyclone is connected with the feed inlet of flotation system, the concentrate of flotation system is connected with calcination ash system, the tailing of flotation system and the slag outlet of calcination ash system are connected with copper leaching tank, and copper leaching tank is connected with copper recovery system and 1# cyanide leaching tank respectively through 1# filter, and 1# cyanide leaching tank outlet is connected with 2# filter, 2# cyanide leaching tank and 3# filter in proper order. The utility model is cleverly combined with the equipment such as grinding classification closed circuit system, flotation system, copper leaching tank, two stage cyanide leaching and copper recovery system, and the efficient comprehensive recovery of gold, silver and copper in high copper iron complex gold extraction carbon calcination slag is realized.

The invention discloses an acid leaching system and method for reducing the copper content of copper electrolysis anode slime in the technical field of copper electrolysis refining, and the acid leaching system comprises a leaching reaction unit which is used for anode slime slurrying to form anode slime slurry with a preset solid-liquid ratio and preset acidity and blast oxidation leaching reaction of the anode slime slurry. According to the oxidation-reduction potential monitored in real time, the supply flow of the oxidizing gas is dynamically adjusted, then the main oxidation stage of the blast oxidation leaching process is kept in the initial stage of the reaction, it is ensured that the anode mud slurry is always in the ideal reaction environment, efficient leaching of the copper element is achieved, and the leaching efficiency is improved. And when the oxidation-reduction potential is continuously higher than a preset threshold value within a preset time period, reducing the flow of the oxidizing gas, switching to an oxygen maintaining and heat preservation stage, and dynamically adjusting the input quantity of the oxidizing gas so as to achieve the optimal reaction equilibrium state, improve the leaching efficiency, reduce the overall input of the oxidizing gas and reduce the heat loss.

The application discloses a kind of copper leaching residue short process efficient treatment method, belong to nonferrous metallurgy technical field.The method will be proportioned after copper leaching residue, lead dross and pure alkali, fluorite, borax, auxiliary material such as coke particle, one-step smelting is carried out in reverberatory furnace.Through the synergistic effect between additives, reduce smelting temperature and melt melting point, promote lead compound to be reduced to metallic lead, and copper is directional enrichment in crude lead alloy.Utilize the specific gravity difference of lead and crude lead alloy realizes separation, finally makes gold, silver and other precious metals in copper leaching residue efficient enrichment in the output crude lead, the crude lead can be directly sent into lead electrolysis workshop refining.The application process is short, low in cost, and strong independence, solves the problem of long process, interference main process production of traditional method, realizes the efficient resource utilization of copper leaching residue.

Methods, compositions and systems are provided that improve recovery of copper from previously leached copper ores. A reset solution comprising a chelating agent and a reducing agent is provided to a heap of previously leached and passivated ore to improve copper recovery kinetics in subsequent leaching stages.

This application provides a composite microbial community and a method for copper extraction by bioleaching assisted by a coupled electric field. The composite microbial community includes *Thiobacillus ferrooxidans*, *Aspergillus niger*, and *Gnaphalium affine*. The composite microbial community is obtained by inoculating *Thiobacillus ferrooxidans*, *Aspergillus niger*, and *Gnaphalium affine* in a composite culture medium at an inoculation ratio of 2:(0.5~2):(0.5~2) and co-culturing them. Under the assistance of an electric field, the composite microbial community synergistically promotes the leaching and extraction of copper from copper-containing substances. This method, through the coupling and coordination of biological and electric field effects, improves the copper leaching and recovery efficiency, and has the advantages of mild conditions, environmental friendliness, and high resource utilization efficiency.