75 results about "Copper leaching" patented technology

The invention discloses a biological carbon / graphene composite material as well as a preparation method and application thereof. The method comprises the following steps: impregnating a biomass raw material with a copper salt solution to obtain a precursor; the precursor is pyrolyzed to obtain a copper oxide modified biological carbon material, then under the conditions of reducing atmosphere and high temperature, carbon dioxide serves as a carbon source, graphene is generated on the copper oxide modified biological carbon material in situ, the biological carbon / graphene / copper composite material is obtained, and the biological carbon / graphene / copper composite material is subjected to copper leaching treatment to obtain the graphene / copper composite material. Obtaining a finished product. The composite material has excellent electrochemical performance, and has excellent rate capability, capacitance and long cycle service life when being used for preparing a capacitor. The preparation method is simple, low in cost and suitable for industrial production.

The invention discloses a method for enhancing biological leaching of copper in a waste circuit board by utilizing magnetite. The method comprises the following steps: adding the pre-crushed waste circuit board and magnetite into a 9K culture medium with the pH value of 1.8-2.0 according to a certain mass ratio, inoculating Acidithiobacillus ferrooxidans as a leaching strain, and carrying out a leaching reaction under a constant-temperature oscillation condition. The magnetite is added, so that the leaching of copper in the circuit board is remarkably enhanced, the leaching rate is remarkably improved, and the leaching period is shortened. And compared with the microbiological leaching result without magnetite, the copper leaching rate is improved by 12-32%. By utilizing the difference between the circuit board and the magnetite in particle size, the magnetite can be recycled from the leaching residues through a physical separation means for a new round of leaching. The method is simple in process, the strain is easy to culture, and the method has good environmental friendliness and is suitable for green and efficient recovery of copper in the waste circuit board.

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.

According to the efficient composite ore leaching flora and the application thereof, by optimizing the specific proportion of thiobacillus ferrooxidans, thiobacillus acidophilus, thiobacillus thiooxidans and high-temperature-resistant leptospirillum and combining a directional domestication technology, the tolerance of the flora to ores with high toxicity and complex components is remarkably improved. Extracellular polymeric substances secreted by the flora strengthen mineral surface reaction through chelation, and the copper leaching rate is increased by 40% or above compared with that of a single strain in cooperation with a segmented temperature control process. The flora provided by the invention can realize efficient metal recovery under the condition of low energy consumption, is suitable for large-scale dump leaching and reactor leaching, and has dual advantages of environmental protection and economy.

The invention discloses a method for comprehensively recovering valuable metals in high-iron bonded copper oxide ore, and belongs to the technical field of resource recovery. According to the method, the high-iron bonded copper oxide ore is subjected to precise ore phase conversion, so that limonite in the high-iron bonded copper oxide ore is converted into magnetite. In the ore phase conversion process, pores and cracks are generated on the surface of the high-iron bonded copper oxide mineral, and grain boundary dislocation occurs between iron minerals and copper minerals, so that release of the bonded copper minerals is promoted; the ore phase conversion product is subjected to mechanical activation, selective enhanced leaching and solid-liquid separation, and iron-rich leaching residues and copper-rich leaching liquid are prepared; and the iron-rich leaching residues are further subjected to low-intensity magnetic separation, and efficient recovery of iron ore concentrate is easily achieved. According to the method, the iron ore concentrate and the copper-rich leachate are finally obtained, and efficient comprehensive recovery of iron and copper valuable metals in the high-iron combined copper oxide ore is achieved.

The invention belongs to the technical field of non-ferrous smelting, and particularly relates to a method for leaching copper from silver separation furnace slag and application. The method for leaching the copper from the silver separation slag comprises the following steps: (1) mixing and slurrying the silver separation slag and water, then adding concentrated sulfuric acid to carry out a leaching reaction, controlling the final pH value to be 1-4.5, and introducing hydrogen peroxide during the leaching reaction to obtain a leaching solution and leaching slag; (2) mixing the leached residues with concentrated sulfuric acid, curing, leaching, and filtering to obtain cured liquid and cured residues; the cured liquid is subjected to countercurrent circulation back to the step (1) to replace water and concentrated sulfuric acid. Most of copper is leached from the silver separation furnace slag through first-stage concentrated sulfuric acid oxidation leaching, so that the copper is separated from metals such as lead, bismuth, antimony and silver; and meanwhile, a second-stage curing reaction is introduced, the structure in the leaching slag is destroyed by concentrated sulfuric acid, copper and oxides thereof in a complex structure are released, the copper content in the cured slag is smaller than 0.1%, the copper leaching rate reaches 99% or above, and deep recovery of copper in the silver separation slag is achieved.

The invention relates to a method for regulating and deacidifying in a bioleaching process of low-grade copper sulphide ore, aiming at the problem of excessive acid caused by excessive oxidation of pyrite in a dump leaching system, a thiocyanate bactericide is added into the bioleaching system of the low-grade copper sulphide ore, and the thiocyanate bactericide is dissolved in a spray liquid of the bioleaching system, and is added into the spray liquid of the bioleaching system; under the catalytic action of mineral leaching microorganisms, oxidation of ferrous ions is enhanced, so that the oxidation-reduction potential of a solution is increased, oxidation of pyrite is intensified, acid accumulation is excessive, the thiocyanate bactericide can remarkably inhibit the activity of part of sulfur-oxidizing bacteria and even kill part of sulfur-oxidizing bacteria, and therefore the activity of ferrous oxide is reduced; compared with the prior art, the method has the advantages that the sulfur oxidation activity of microorganisms is greatly influenced, but the oxidation influence on iron is relatively small, so that the acid leaching is reduced under the condition that the copper leaching of the copper sulfide ore is not influenced, the copper leaching is not influenced, the acid leaching is reduced, the production cost is reduced, the environmental influence is reduced, and the like.

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.

This invention provides a method for recovering copper from waste circuit boards, belonging to the field of waste circuit board recycling technology. The method for recovering copper from waste circuit boards according to this invention includes the following steps: (1) Crushing and sorting: mechanically crushing and sorting the waste circuit boards to obtain copper-enriched metal particles; (2) Pre-leaching: mixing the metal particles with a dilute sulfuric acid solution to perform a pre-leaching reaction, obtaining pre-leaching residue and pre-leaching solution; (3) Electrolytic deposition: using the pre-leaching solution as an electrolyte for electrolytic deposition to obtain high-purity copper deposits; (4) Post-treatment: washing and drying the copper deposits to obtain recovered copper. The entire recycling process of the technical solution described in this invention does not generate harmful gases or wastewater, resulting in minimal environmental pollution. Furthermore, this invention allows for copper leaching and electrodeposition within the same device, shortening the process flow and reducing energy consumption.

A process for producing a silver concentrate from metallurgical residues, in particular from residues containing copper, iron, lead, silicon, silver and antimony and optionally containing elements such as arsenic and bismuth, comprising: (i) copper leaching of the metallurgical residues with a first acid solution in order to obtain a first leach solution rich in copper and iron and optionally in arsenic and a first leached sludge having a reduced copper and iron content and optionally a reduced arsenic content and being rich in lead, germanium, silver and silicon, (ii) leaching of the first leached sludge, wherein the first leached sludge is treated with a first solution of a carboxylate in order to obtain a second leached sludge lacking lead and a second leach solution rich in lead, (iii) alkaline leaching of the second leached sludge, wherein a base is added in order to form an alkaline leach solution in order to obtain a third leached sludge having a reduced silicon content and a third leach solution rich in silicon and optionally in arsenic, (iv) hydrochloric acid leaching of the third leached sludge, wherein an acid solution is used in a chloride environment in order to obtain a fourth leached sludge for final disposal and a fourth leach solution rich in silver, copper, lead and iron and optionally in arsenic, (v) precipitation of silver from the fourth leach solution rich in silver, copper and iron and optionally in arsenic with a neutralizing slurry in order to produce a fifth solution rich in chlorides and a first precipitated solid rich in iron, copper, lead and silver and optionally in arsenic, (vi) leaching of the first precipitated solid rich in iron, copper, lead and silver and optionally in arsenic with a sulfuric acid solution in order to produce a sixth leach solution rich in copper, iron and optionally in arsenic and a first silver and lead concentrate, and (vii) leaching of the first silver concentrate with a second carboxylate solution in order to produce a seventh leach solution and a second silver concentrate.

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.

The application discloses a method for separating copper and molybdenum in copper-molybdenum concentrate, which uses water as leaching reagent and adds leaching aids in the water to replace the mixing of acid and molybdenum concentrate; in the pre-leaching process, auxiliary ultrasonic high-frequency oscillation is used to promote the disembedding of copper and molybdenum particles and accelerate the dispersion of the particles; then, oxygen pressure cooking is carried out in cooperation with the temperature and oxygen partial pressure, so that the accurate and efficient separation of molybdenum and copper is realized; after the leaching residue is dried, the molybdenum concentrate with copper content meeting the national standard requirements is obtained, and the copper in the liquid is recovered by using a suitable method. In the application, the copper is only leached into the solution under the conditions of low temperature, short time and low pressure, the leaching of molybdenum is limited, and the molybdenum can continue to be in the form of original molybdenum concentrate in the residue. In addition, the method of the application uses water pre-leaching, and the copper is leached into the solution under the assistance of ultrasonic and leaching aids, and the copper content of the treated molybdenum concentrate is less than 0.15%.

The invention discloses a chalcopyrite bioleaching method based on synergistic effect of mechanical activation and potential regulation and control, which comprises the following steps: sequentially carrying out crushing and mechanical activation pretreatment on chalcopyrite, and carrying out pulp mixing to obtain initial ore pulp; adding an acid leaching solution containing iron ions into the obtained initial ore pulp to obtain ore pulp containing ferric iron; and sulfur-oxidizing bacteria are inoculated into the obtained trivalent iron-containing ore pulp, leaching is carried out under the condition of constant temperature, and then solid-liquid separation is carried out to obtain copper-containing leachate and leached tailings. According to the method, mechanical activation pretreatment is combined with the synergistic effect of sulfur-oxidizing bacteria (Acidithiobacillus caldus) and Fe < 3 + >, the redox potential is controlled to be 300-350 mV, and the copper leaching rate is larger than or equal to 95%. According to the method, sulfur oxidizing bacteria are used for oxidizing elemental sulfur to generate sulfuric acid, potential is controlled, acid consumption is reduced, passivation is avoided, and the method has the advantages of being efficient, environmentally friendly and high in resource utilization rate.

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.

The invention provides a green gold and copper leaching agent and a dump leaching process, and belongs to the field of hydrometallurgy. The green gold and copper leaching agent comprises a green leaching agent main body, an auxiliary leaching agent and an impurity metal masking agent, the green leaching agent main body is a proline derivative, the impurity metal masking agent is one or two of glutathione and N-acetyl-L-cysteine, and the auxiliary leaching agent is one or more of hydrogen peroxide, calcium peroxide and sodium hypochlorite. Due to the application of the proline derivative, the non-toxicity and environmental protection property of a medicament system are ensured; the auxiliary leaching agent is beneficial to efficient chelation of metal ions and the medicament; the impurity metal masking agent ensures the green concept of a medicament system, and effective extraction of target metal is ensured through chelating of functional groups in a molecular structure of the impurity metal masking agent and impurity metal. According to the method, through mutual cooperation of the agent combination and the dump leaching process, green and efficient extraction of gold and copper metal resources is achieved, and meanwhile environmental friendliness and safety are guaranteed.

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.

Methods, compositions and systems are provided that improve recovery of copper form 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.

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 invention relates to a process for comprehensively recovering valuable metals from cobalt-rich waste. Cobalt silicate in the waste is converted into sodium cobalt silicate through sodium carbonate roasting pretreatment, cobalt ferrite is converted into cobaltous oxide and ferric oxide, and composite oxides of tungsten, tantalum, and niobium are converted into soluble sodium salts such as sodium tungstate and sodium chromate. These are then separated from alkaline oxides such as cobaltous oxide in a subsequent water leaching process. Cobalt, iron, and copper in the water leaching residue are leached into a solution through sulfuric acid reduction leaching, while metals such as tantalum and niobium are contained in the acid leaching residue. Tungsten and chromium in the water leaching solution are separated by concentrated hydrochloric acid neutralization followed by tungsten precipitation followed by chromium reduction precipitation. This process has the advantages of a high elemental leaching rate and high separation efficiency of cobalt from elements such as tungsten and chromium. Furthermore, the process is simple, the reaction conditions are mild, and the raw materials used are inexpensive. It can achieve comprehensive recovery of elements such as cobalt, tungsten, and tantalum.

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.

A process for leaching copper and lead from a metallurgical residue of smelted powder which has undergone a copper leaching process and comprises copper, iron, lead, silicon and optionally arsenic, antimony and bismuth, comprising: (i) leaching copper from the metallurgical residue with a first acid solution so as to obtain a first leach solution rich in copper and iron and optionally arsenic, antimony and bismuth and a first leached sludge having a reduced copper and iron content and optionally a reduced arsenic content and being rich in lead and silicon, (ii) leaching the first leached sludge with a first solution of carboxylate salt so as to obtain a second leached sludge lacking lead and a second leach solution rich in lead, (iii) precipitation, wherein a first base is added to the second leach solution rich in lead so as to obtain a first lead concentrate and a first precipitated solution lacking lead, (iv) alkaline leaching of the second leached sludge, wherein a second base is added so as to form an alkaline leaching solution so as to obtain a third leached sludge having a reduced silicon content and a third leach solution rich in silicon and optionally arsenic, (v) hydrochloric acid leaching of the third leached sludge, wherein an acid solution is used in a chloride environment so as to obtain a fourth leached sludge for final disposal and a fourth leach solution rich in copper, lead and iron and optionally arsenic, (vi) (vii) precipitating metals from the fourth leach solution rich in copper, lead and iron and optionally arsenic with a neutralizing slurry so as to produce a fifth solution rich in chlorides and a first precipitated solid rich in iron, copper and lead and optionally arsenic, and (viii) leaching the first precipitated solid rich in iron, copper and lead and optionally arsenic with a sulphuric acid solution so as to produce a sixth leach solution rich in copper, iron and optionally arsenic and a second lead concentrate.

The invention discloses a method for recovering copper and nickel through synergistic treatment of nickel matte and copper electrolysis waste liquid, which comprises the following steps: adding the ground nickel matte into the copper electrolysis waste liquid for reaction, and carrying out solid-liquid separation to obtain nickel-copper leaching residues and an acidic nickel-containing solution; the method comprises the following steps: evaporating and concentrating an acidic nickel-containing solution to obtain crude nickel sulfate crystals and crystallization mother liquor, adding nickel-copper leaching residues into the crystallization mother liquor for reaction, carrying out solid-liquid separation to obtain high-copper residues and nickel-containing filtrate, cooling and crystallizing the nickel-containing filtrate to obtain the crude nickel sulfate crystals and secondary crystallization mother liquor, the nickel sulfate crystal can be used for preparing a refined nickel sulfate product or electric nickel, and the secondary crystallization mother liquor or the nickel-containing filtrate is directly returned to be combined with the acidic nickel-containing solution without crystallization. The method has the advantages that synergy of the nickel-copper smelting process can be achieved at the same time, the problem that nickel and copper in nickel matte and the copper electrolysis waste liquid are difficult to efficiently separate is effectively solved, and economic benefits and environmental protection benefits are remarkable. The method is short in process, simple to operate and easy for industrial application.

The utility model discloses a short-process high-valued recovery system for copper-leaching pregnant solution, which relates to the technical field of wastewater treatment and comprises a copper collecting device, an impurity removing device, a zinc collecting device and a neutralizing device which are sequentially arranged, a first ORP probe is arranged in the copper collecting device and is linked with copper collecting agent adding equipment; a first PH probe is arranged in the impurity removal device and is linked with impurity removal agent adding equipment; a second ORP probe is arranged in the zinc collecting device and is linked with zinc collecting agent adding equipment; and a second PH probe is arranged in the neutralizing device and is linked with neutralizing agent adding equipment. Copper, arsenic, zinc and the like in the copper leaching pregnant solution are effectively recovered step by step by adopting a short-process recovery process and a step-by-step vulcanization method and are respectively converted into sulfides, the obtained product can be directly sold or a single element body can be obtained through pyrogenic process smelting, the production process of an enterprise is shortened, valuable metals are recovered and neutralized by a neutralizing device, and the production cost is reduced. Generated neutralization slag is piled up as solid waste, wastewater can be recycled for production, and secondary pollution is avoided.

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.