189 results about "Copper leaching" patented technology

The invention aims at providing a method for recovering tellurium, bismuth, antimony, and copper from a complex material. The method comprises the steps that: the complex material is added into a sodium hydroxide solution according to a solid-liquid ratio; a temperature and a stirring time are controlled; when a reaction is finished, bismuth, antimony and copper slag and tellurium leaching liquid are obtained; the pH of the tellurium leaching liquid is regulated by adding dilute sulfuric acid; the mixture is settled and is subjected to solid-liquid separation, such that tellurium enrichment is obtained; the bismuth, antimony and copper slag is added into a dilute sulfuric acid solution according to a solid-liquid ratio; a reaction is sufficiently carried out, such that bismuth and antimony slag and copper leaching liquid are obtained; the solution temperature of the copper leaching liquid is controlled, and NaOH is added for precipitating copper; according to a solid-liquid ratio, the bismuth and antimony slag is added into a mixed solution of sulfuric acid and sodium chloride; the mixture is violently stirred, such that bismuth-antimony separation is realized; NaOH is used for regulating solution pH value and for precipitating bismuth; when the reaction is completed, bismuth enrichment and bismuth-precipitated liquid are obtained. With the technical scheme provided by the invention, tellurium, bismuth, antimony, and copper valuable metals can be comprehensively recovered from the complex material, such that waste is turned into valuable matters.

The invention provides a wet copper extraction process used in high mud-content copper oxide ores of cold areas. The process comprises the following steps: crude ores are crushed and sieved, coarse fraction ores are sent to a storage yard for piling, fine fraction ores are sent to an ore washing system for washing and grading; placer ores are sent to the storage yard for the piling after washing the ores, and mud ores are sent to an agitation tank for agitation leaching; leaching solution which is obtained from heap leaching and agitation leaching processes is sent for extraction and stripping; stripping concentration solution is sent to an electrodeposition process, and a qualified cathode copper product is obtained; leached slag from the agitation leaching is neutralized and sent to a tailings reservoir for piling. The process has good permeability, fast copper leaching rate, and greatly improved copper leaching rate and leached copper yield per day by the grading and the heap leaching of the coarse fraction ores; and the copper leaching rate is improved and the ore utilization rate is greatly improved by the agitation leaching of minus 0.074mm size fraction ores. The method is applicable to the development and the application in the wet copper extraction process used in the high mud-content copper oxide ores of the cold areas, solves the difficult technical problems of poor bing permeability and slow copper leaching rate, widens the use range of copper ore resources and improves the comprehensive utilization rate of the copper.

The invention relates to a process for recycling valuable metal from lead copper matte, which belongs to the field of nonferrous metallurgy hydrometallurgy. The process adopts pressurization oxidation leaching in an alkalic system to convent sulfur into sulfate to be desorbed, then atmospheric pressure copper leaching is performed through diluted acid, and copper electro-deposition is further performed through purification and impurity removal to obtain cathode copper. The process is a real metallurgy cleaning process, is low in requirement for corrosion resisting conditions of device material quality, basically free of sewage discharge, free of environment pollution, short in process flow, high in comprehensive recovery rate of metal and changeable in scale, and has the advantages of having strong practical applicability and adaptability to the scale and raw materials and the like.

Belonging to the technical field of wet metallurgy, the invention especially relates to a method for comprehensive recovery of valuable metals from tin anode mud. The method comprises the following technical key points of: mixing the tin anode mud with one or more of an alkali metal hydroxide aqueous solution and an alkali metal sulfide aqueous solution, keeping the pH value of the mixed feed solution greater than 12, placing the feed solution into a sealed reactor, conducting heating to a temperature of 100-300DEG C, carrying out stirring reaction, then performing filtration, recovering valuable metals, mainly tin, from the filtrate, and recovering various valuable metals from the filter residue by means of oxidizing roasting transformation, copper leaching by sulfuric acid, silver leaching by nitric acid, bismuth leaching by hydrochloric acid. The invention is particularly suitable for treatment of tin anode mud with high antimony and low silver, and can achieve a good comprehensive recovery effect for various valuable metals. The leaching rate of tin is greater than 90%, the removal rate of antimony is greater than 85%, and silver, bismuth, copper, as well as lead are enriched over 4 times. And the method generates a relative small amount of ''three wastes'', thus being in favor of environmental protection.

The invention discloses a method for leaching copper in waste PCBs by mixed bacteria. The waste PCBs are preprocessed for standby use; acidithiobacillus ferrooxidans and acidithiobacillus thiooxidans are subjected to copper-resistant acclimation and culture respectively, and are mixed and cultured in a mixed bacteria culture solution; when the culture time reaches 40h-55h, powder of the PCBs is started to be added; then powder of the PCBs is added in additional dosage point by point at other time points; and bioleaching is performed. According to the method, when the mixed bacteria are cultured, the PH value of the culture solution is not required to be adjusted, two types of bacteria can grow in balance; at the same time, when the two types of bacteria grow, a large amount of sulfuric acid and Fe 3+ are generated and used for leaching copper in the powder of the waste PCBs in a later period; and in the whole process, the efficiency is high, and the energy is saved. A manner of low front, high rear and multipoint addition is adopted; and on the basis that the additive amount of the powder of the waste PCBs is increased, the copper leaching efficiency is improved remarkably, however, the bacteria growth inhibition degree is relatively small.

The invention discloses a method for potential-controlled separation and enrichment of tellurium in copper anode slime. The method comprises the steps of stirring and mixing the copper anode slime and concentrated sulfuric acid according to a center ratio, roasting under different temperature gradients, carrying out ball milling on the roasted product to a required particle size, adding hydrogen peroxide and carrying out oxidation leaching in a dilute sulfuric acid solution in the potential controlling way, adding copper powder to a copper leaching liquid and replacing in the potential controlling way, enriching the tellurium in the replacement residue and recycling copper through carrying out electrodeposition on the replaced liquid. The essence of method disclosed by the invention is that the purposes that the oxidation leaching process and the copper powder replacing process are adjustable and controllable are respectively realized in the potential controlling way; the leaching rates of the copper and the tellurium are respectively up to above 99.0% and above 80.0% in the potential-controlled oxidation leaching process; and the replacement rate of the tellurium in the potential-controlled replacing process is up to above 99.0%. The method disclosed by the invention has the advantages that the technical index in the technical processes is stable; the labour intensity is low; the production cost is low and the like.

The invention relates to a method to take self-catalytic reduction ammonia leaching from deep- sea multi-metal nodule, especially uses carbon monoxide as reducer. The process includes the following steps: adding grinded material to ammonia-ammiaonia sulfate solution and adding carbon monoxide to take reducing leach; concentrating and separating, filtering to gain leaching liquid A; washing filtered cake to gain the wash water B with nickel, copper, cobalt, molybdenum, and zinc; mixing the leaching liquid A and wash water B adding air to take oxidizing, filtering to gain deposit C and solution D that contains nickel, copper, cobalt, molybdenum and zinc; deposit C returning to leach, recycling nickel, copper, cobalt; recycling the valued metal in solution D. The invention could make the cuprous ion concentration stable from the copper leaching itself.

The invention provides a process for recycling copper through electrodeposition by treating scrap copper materials by adopting a cyclone electrolysis technology, belonging to the technical field of recycling copper from wastes containing copper. The process is characterized by taking various purchased wastes containing copper as raw materials, preliminarily screening and grinding the wastes, adding the materials to a dissolved copper leaching bath device to undergo continuous copper dissolving to obtain a copper sulfate solution, then filtering the solution with precision filter equipment, decoppering the obtained filtrate through cyclone electrolysis, scalding an obtained copper pipe with weak acid and then feeding the copper pipe into a product processing unit to process a standard copper plate. The process has the following beneficial effects: through portable or module assembly, the cyclone electrolysis bath and support equipment are convenient to install, dismantle and move; the solution circulates in a closed loop, thus avoiding emission of harmful gases; electrolytic deposition is carried out on the metals selectively and the copper can be better purified by applying the cyclone electrolysis technology; higher current density and current efficiency are ensured, fewer reagents are consumed, the production cost is lowered and the enterprise revenue is improved; and high efficiency and high purity electrolytic extraction is carried out on the solution, the recycled copper is the standard cathode copper and the total recycling rate is above 96%.

The invention discloses a leaching method of gold and copper in a gold-contained electronic waste. The gold-contained electronic waste is crushed, and the particle size of crushed particles is not more than 2 mm; then, the ball-milling treatment is performed, and the particle size is not more than 1 mm after the ball-milling treatment; powder obtained by the ball-milling treatment is added in sulfuric acid solution with a concentration of 130-170 g/L for copper leaching to obtain copper-enriched solution and copper leaching slag; and finally, the chlorination gold leaching is performed for the copper leaching slag to obtain gold-enriched solution. The method realizes the separation of copper and gold; the obtained copper-enriched solution and gold-enriched solution can be deeply treated to obtain gold and copper simple substances; and in the separation process, such other metals as lead and tin can be separated through controlling the redox potential.

The invention discloses a method for extracting gold, silver and copper from a mobile phone circuit board. The method comprises steps as follows: step one, pretreatment of the mobile phone circuit board: the circuit board is calcined, broken, screened and subjected to magnetic separation, and metal-enriched powder and non-metal impurities are obtained through pneumatic separation; step two, metal element analysis: content of metals such as silver, copper, aluminum, zinc and the like is tested by an atomic absorption spectrometer, and content of precious metals such as gold, platinum, palladium and the like is measured by an inductively coupled plasma emission spectrometer; step three, extraction and recovery of silver and copper; step four, thiourea leaching of gold: residues obtained after silver and copper leaching with nitric acid are put in a reactor and dissolved with thiourea and ferric sulfate, and content of gold is measured; step five, gold recovery: the solution obtained after thiourea leaching of gold is transferred to a reaction container, trisodium citrate and zinc powder are added, and filter residues are subjected to electrolytic refining of gold. According to the method, extraction and recovery rate of gold, silver and copper is high, the reaction speed is high, invested cost is low, little environmental pollution is produced, and industrialization is facilitated.

The present invention relates to a process of producing copper sulfate from copper sulfide ore. In one Lurgi boiling bed roaster, copper sulfide ore powder is roasted at 660-710 deg.c into roasted sand copper with acid dissolving rate of 98 % and water dissolving rate of 60-70 % and the exhausted SO2 is used directly in preparing acid. Roasted sand copper is made to mix with dilute copper sulfatesolution returned from extraction step and sulfuric acid is added to regulate liquid-to-solid ratio of 1-2 and ultimate H2SO4 concentration lower than 20 g/L. The copper leaching rate is greater than98%. The crystallized secondary mother liquid is extracted and purified to recover copper sulfate. The extracting liquid is back extracted with dilute sulfuric acid, the back extracting liquid is returned to leaching step and the organic phase containing extractant is returned to secondary mother liquid.

The invention relates to a mixture ammonia leaching method of deep sea multi-metal nodule and cobalt-bearing crust that the process includes the following steps: mixing, crashing, grinding the multi-metal nodule and cobalt-bearing crust; adding the material into ammonia salt solution and adding carbon monoxide to take reducing leaching out; concentrating and separating, the supernatant returning to leaching out and the underset taking filtering to gain leaching out liquid A; washing filtered cake to gain the wash water B with nickel, copper, cobalt, molybdenum; mixing the leaching liquid A and wash water B adding air to take oxidizing, filtering to gain deposit C and solution D that contains nickel, copper, cobalt, and molybdenum; deposit C returning to leach, recycling nickel, copper, cobalt; recycling the valued metal in solution D. The invention could make the cuprous ion concentration stable from the copper leaching itself.

The copper sulfide ore is leached in the halide bath without using a special oxidant but with the use of only air. The copper and gold in the copper sulfide ore can be leached at high leaching ratio.

The treating steps are as follows.

• • (1) Copper leaching process (CL). The raw material is charged into the first acidic aqueous solution, which contains cupric chloride, ferric chloride, 7 g/L of hydrochloric acid, and sodium chloride. The post-leach liquor contains copper in cuprous state ions and copper in cupric state ions.
  • (2) Solid-Liquid separation step. The resultant solid and liquid of CL step are separated.
  • (3) Air oxidation step (OX). Air is blown into the post solid-liquid separation liquor. The copper in cuprous state ions are oxidized to the copper in cupric state ions. The iron leached in the step (1) is oxidized. Simultaneously, the impurities leached in the step (2) are precipitated.
  • (4) Copper extracting step (CEX). The copper is recovered from the post-liquor of the step (3)
  • (5) Gold recovering step (AL). The residue separated in the step (2) is added to the leach liquor similar to that of the step (1). The steps (1) and (5) are carried out under the atmospheric pressure and at the temperature of boiling point or lower, while blowing air into the leach liquor.

The invention relates to a wet metallurgy technology of complex copper sulphide ore, in particular to a complex copper sulphide ore thermal activating-pressure leaching technology. The technical scheme of the technology is as follows: activating time is 2.0 hours under the temperature of 300 DEG C; leaching temperature is 180 DEG C; oxygen partial pressure is 0.6 MPa; initial sulfuric acid concentration is 1.23 mol/L; solid-to-liquid ratio mL/g is 5:1; surface active agent selects calcium lignin sulfonate, wherein usage amount thereof is 1.25% of the weight of fine ore; stirring speed is 500 r/min; and leaching time is 2.0 hours. The technology can not generate toxic compounds such as SO2, and the like, to cause low-air pollution, is cleaning and environmentally friendly, improves the copper leaching ratio from original less than 70% to more than 90%, smoothly solves the difficulties of easy passivation in the process of leaching yellow copper ore and tetrahedrite, improves metal use ratio, and reduces resource waste.

The invention discloses a technological method for cleaning and efficiently treating arsenic matte. The technological method comprises steps of crushing, grinding, low-temperature acid leaching, high-temperature arsenic precipitating and the like. The technological method is a wet process, is low in energy consumption, is less in environmental pollution, is high in degree of automation and is high in production efficiency. The technological method is simple and quick in reaction process and is high in selectivity. Copper in arsenic matte can be efficiently leached, so that metal is separated completely. Compared with a current wet process for treating the arsenic matte, a copper leaching process can be quickly realized at a relatively low leaching temperature within relatively short time. The arsenic removal effect is good, and an arsenic removal rate is higher than 99%. Arsenic in the arsenic matte is recycled in the form of arsenic slag, so that secondary pollution of arsenic is avoided. The technological method has the advantages of being high in metal recovery rate, low in production cost, good in economical effect, high in adaptability to raw materials, clean, environmentally friendly and the like.

An object of the present invention is to provide a method of efficiently leaching copper from copper sulfide ores containing chalcopyrite at room temperature.

A method of recovering copper from copper sulfide ores, characterized by comprising: using a sulfuric acid solution having a chloride ion concentration adjusted to 6 g/L or more but less than 18 g/L and a pH adjusted to 1.6 or more but less than 2.5 as a leaching solution; and carrying out copper leaching with the addition of a chloride ion-resistant sulfur-oxidizing bacterium to the leaching solution, when recovering copper from copper sulfide ores containing chalcopyrite, is provided.

The invention relates to a method for recovering rare and precious metal from copper anode slime copper leaching liquid. The method comprises the following steps that 1, rare and precious metal are strengthened and reduced form the copper anode slime copper leaching liquid; and 2, ultrafine particles of rare and precious metal are precipitated, and purification of the copper leaching liquid is synergistically conducted. According to the method for recovering the rare and precious metal from the copper anode slime copper leaching liquid, the copper leaching liquid is pre-treated through the process and can be effectively purified, and the impurity content is reduced, the key point is that the rare and precious metal is efficiently and synergistically recovered, so that the rare and preciousmetal which is dissolved and dispersed in the copper leaching liquid at an ionic state and ultrafine particle state are effectively reduced and enriched, and rare and precious metal concentrate is obtained; and the concentrate is high in valuable element grade and single in element state, and is a source of high quality raw materials for recovering the rare and precious metal, and the method forrecovering the rare and precious metal from the copper anode slime copper leaching liquid has the advantages of high process adaptability, high reduction rate, less impurities and high efficiency.

The invention relates to a method for leaching copper from copper oxide ore, and belongs to the field of extracting metal compounds from ores or concentrates by wet methods. The technical problem solved by the invention is to provide a method for leaching copper from copper oxide ore, which is continuous leaching, and has higher production efficiency than the existing technology. The method for leaching copper from copper oxide ore of the present invention comprises the following steps: adding the reaction amount of copper oxide ore and sulfuric acid into the reactor at a uniform speed, mixing, and reacting the copper oxide ore and sulfuric acid for 0.5 to 2 hours, and the obtained slurry is The material flows out from the reactor in a continuous discharging manner; wherein, the concentration of the sulfuric acid is 8-25wt%, and the copper oxide ore can pass through a 100-mesh sieve. The method of the invention improves the production efficiency of copper oxide ore leaching, realizes the continuous acid leaching of copper oxide ore, improves the copper leaching rate, greatly reduces production cost, and provides a new option for acid leaching of copper oxide ore ,with broadly application foreground.

The invention relates to a method for separating copper from lead matte and comprehensively utilizing lead matte, and belongs to the field of wet metallurgy of non-ferrous metals. The process is characterized by adding hydrogen peroxide under a hydrochloric acid system for oxidization leaching. The method is as follows: ball-milling lead matte blocks until grain size is lower than 100 meshes, and feeding the ball-milled lead matte into a leaching slot for carrying out oxidization leaching, wherein HCl concentration is controlled to 1mol/L-6mol/L, concentration of hydrogen peroxide is controlled to 0.5mol/L-3.5mol/L, a liquid-solid ratio is controlled to (3-10):1, a temperature is controlled to 60-90 DEG C and reaction time is controlled to 1-2 hours. Under a hydrochloric acid condition, hydrogen peroxide is utilized and used as an oxidant for leaching sulfide; in the oxidization leaching process, sulfur in the lead matte is oxidized into elemental sulfur or sulfate radical, copper is oxidized to enter liquor in the form of ion, and lead is left in slag with gold and sliver in the form of lead chloride or lead sulfate. After the leaching process is completed, solid-liquid separation is carried out to realize preliminary separation of copper and lead. Copper-rich leachate can replace deposited copper by adding scrap iron, and leaching residue is returned to a pyrogenic process lead refining system for recycling valuable elements such as lead, sliver, elemental sulfur, and the like.

The invention provides a pretreatment method for platinum palladium concentrate. The pretreatment method comprises the following steps: mixing the platinum palladium concentrate, sodium carbonate, sodium hydroxide and sodium chlorate uniformly according to a certain ratio; roasting at certain temperate; transforming impurity elements such as copper, selenium and tellurium into corresponding oxide or corresponding salt; and adding the roasting slag into water according to a certain ratio and leaching, wherein impurities such as copper, selenium and tellurium enter the alkaline leachate, and gold, platinum and palladium are enriched in the alkaline leaching slag. Compared with the traditional pretreatment method for the platinum palladium concentrate, the pretreatment method for the platinum palladium concentrate has the advantages that oxidation roasting and water leaching are adopted, so the noble metal content of the alkaline leachate is low; the leaching rate of the impurities such as copper, selenium and tellurium is high, the copper leaching rate reaches over 95 percent, the selenium leaching rate reaches over 88 percent, and the tellurium leaching rate reaches over 95 percent; the enrichment rate of the noble metal such as gold, platinum and palladium is high, so the extraction treatment on gold, platinum and palladium in the next step is promoted; and equipment is low in corrosivity, safe in operation, good in comprehensive recycling benefit and good in operating environment.

The invention relates to the field of hydrometallurgy of nonferrous metals, in particular to a method for selectively extracting copper from iron-copper-matte materials. The method for selectively extracting the copper from the iron-copper-matte materials comprises the following steps that after being subjected to crushing grinding and sulfuric acid adding size mixing, the iron-copper-matte materials are subjected to oxidizing leaching by pumping enriched oxygen into a high-pressure kettle; after oxidizing leaching of the iron-copper-matte materials is completed, solid-liquid separation is carried out to obtain leaching liquid and leaching residues; and after the leaching liquid is subjected to acid adjusting, a rotational flow electrolysis technology is adopted for obtaining a cathode copper product. The iron-copper-matte materials comprise, by weight percentage, 15%-45% of Pb, 35%-60% of Cu, 2%-18% of S, 0.2%-0.8% of Ag, 5%-20% of As and 0.05%-0.6% of Fe. The method is especially suitable for selectively extracting the copper from the iron-copper-matte materials with the low iron content, the rotational flow electrolysis technology is adopted in the copper leaching liquid for electrolysis of settled copper, the yield is higher, and the obtained cathode copper product is few in impurity and high in purity.

A process to significantly improve the copper chemical leaching process for primary and secondary minerals, using calcium chloride including the agglomeration, curing, and leaching with a high content of chloride, iron and copper stages. The mineral is then washed with a low concentration of copper and a high concentration of acid, where the impregnated copper is extracted from the pit and wherein a recirculated solution is used in the agglomeration stage.

The invention discloses a heap bioleaching method for secondary copper sulfide ore. The heap bioleaching method for the secondary copper sulfide ore comprises the steps that after the secondary copper sulfide ore is heaped, mine acid waste water or raffinate is used for spray wetting and fungus distribution, so that microorganisms are made to grow rapidly on the surface of the ore, and rapid leaching of the secondary copper sulfide ore is achieved; and afterwards, the leaching process is conducted by two stages, specifically, in the first stage, the raffinate obtained after leach liquor is extracted is used for continuous spraying, the acid concentration is controlled to 5-15 g/L, the total iron concentration is controlled to 5-15 g/L, and the oxidation reduction potential does not need to be controlled particularly; and the second stage is started when the copper leaching rate reaches 45%-50%, the mine acid waste water or the mixed liquor of the mine acid waste water and the raffinate is used for intermittent spraying in the second stage of the leaching process, the acid concentration is controlled to 3-6 g/L, the total iron concentration is controlled to 3-6 g/L, and the oxidation reduction potential is controlled to 600-700 mV. By adoption of the heap bioleaching method for the secondary copper sulfide ore, oxidation of iron pyrite can be effectively restrained while efficient leaching of copper is achieved, technological parameters can be controlled easily, the production cost is low, and the economic benefit and the environment benefit are remarkable.