138 results about "Chalcopyrite" patented technology

The invention provides a composite reagent system and a chalcopyrite and sphalerite collecting method, and belongs to the technical field of mineral processing. The composite reagent system comprises a histidine derived functional group collecting agent and a black agent, and the histidine derived functional group collecting agent (containing a total sulfur ester group, a sulfydryl functional group and a side chain imidazole ring) serves as a core and is compounded with the black agent according to a specific proportion to form a target combination-synergistic interaction flotation mechanism. The histidine derivative collecting agent derives high-activity functional groups under the alkaline condition, and after sulfydryl is dissociated, stable chemical bonds are formed by the dissociated sulfydryl and metal ions on the surfaces of the chalcopyrite and the zinc sulfide. The black powder serves as an auxiliary collecting agent, and the collecting capacity of fine-grain or low-activity sulfide minerals is enhanced through chemical adsorption of dithiophosphate radicals and metal ions on the surfaces of the chalcopyrite and the sphalerite. After the two components are compounded, the selective enrichment efficiency of copper-zinc minerals in the flotation process is remarkably improved.

The invention provides application of sodium 2, 3-dimercaptopropanesulfonate as an inhibitor in low-alkalinity copper-sulfur flotation separation, and relates to the technical field of mineral separation. When the compound serves as an inhibitor, the compound, a collecting agent and a foaming agent are prepared into a composite flotation reagent and used for low-alkalinity flotation separation of chalcopyrite and pyrite, flotation separation is conducted through the steps of one-time roughing, at least one-time scavenging and at least one-time concentration after ore grinding and grading, and copper concentrate is collected; the method can effectively solve the problems that the copper-iron separation effect is poor in the process of flotation separation of the chalcopyrite and the pyrite, the copper recovery rate is low due to addition of a large amount of lime and the like, the chalcopyrite and the pyrite can be efficiently separated under the low-alkalinity condition through the specific flotation process, and the flotation effect on the chalcopyrite is improved.

The present invention belongs to the field of resources and environment, and discloses a method for promoting chalcopyrite bioleaching by in-situ depassivation: in an anaerobic environment, passivated chalcopyrite and reduced sulfur are added to a 9K culture medium, an acidophilic microbial strain is inoculated for culture, and the chalcopyrite is collected by centrifugation; the collected chalcopyrite is dried and added to a 9K culture medium, and the acidophilic microbial strain is inoculated for culture and leaching under an aerobic environment. The present invention introduces acidophilic microorganisms and sulfur into the anaerobic system, so that the dense passivation film of the chalcopyrite can be reduced and removed, allowing the copper ions in the mineral to be leached under aerobic conditions in the later stage. This not only overcomes the shortcomings of pure chemical reaction leaching, such as high energy consumption, high consumables, and environmental pollution, but also solves the problem of low utilization efficiency due to the passivation film hindering leaching during the bioleaching process, so that the chalcopyrite can be utilized to the greatest extent. This in-situ depassivation bioleaching technology has a wide range of applications, low site requirements, and can be used on a large scale industrially.

The present invention provides a method for separating molybdenite and chalcopyrite based on surface oxidation, belonging to the technical field of mineral separation. In this method, molybdenite and chalcopyrite are ground finely. The ground materials are taken and added with water and put into the flotation cell of a flotation machine. After adding hydrogen peroxide and stirring, ultrasonic treatment is carried out for 3 - 5 minutes. After the treatment, the pH of the pulp is adjusted with a pH adjuster, collector kerosene and foaming agent MIBC are added and stirred for 1 - 5 minutes, and then air flotation is carried out to obtain concentrate and tailing products. Under the action of an oxidant, the surface of molybdenite is oxidized, and the oxidation products generated on the surface of molybdenite will fall off during ultrasonic treatment. This oxidation product will inhibit the flotation of chalcopyrite but will not inhibit the flotation of molybdenite. This method can achieve the flotation separation of molybdenite and chalcopyrite without using inhibitors, thereby reducing the reagent cost.

The present invention discloses a flotation separation method for inhibiting molybdenite and galena in the flotation of chalcopyrite, realizing the efficient separation of chalcopyrite from molybdenite and galena, and belonging to the technical field of mineral separation. During the flotation separation process, under the conditions of a pH of 4 - 10, an inhibitor dosage of 50 - 200 mg / L, a collector Z-200 dosage of 20 - 40 mg / L, and an MIBC / No. 2 oil dosage of 10 - 20 mg / L, a flotation process of first bulk flotation and then concentrate separation is adopted; Quercetin is widely present in nature and is currently mainly used in the food industry and the clinical industry. It can be obtained by plant extraction and is an ideal inhibitor for molybdenite and galena; Under these process conditions, quercetin inhibits the floatability of molybdenite and galena, realizing the effective separation of copper-molybdenum and copper-lead. This method has advantages such as a wide applicable pH range, good separation effect, and environmental friendliness, and has broad prospects for popularization and application.

The present invention provides a flotation depressant for separating chalcopyrite and molybdenite, and a chalcopyrite and molybdenite beneficiation method, specifically relating to the field of mineral processing technology. The flotation depressant comprises sodium thioglycolate, a hydroxycarboxylic acid homologue, and a reducing agent in a mass ratio of (20-60):(1-5):(1-5). The hydroxycarboxylic acid homologue comprises at least one of 3-mercaptopropionic acid, β-mercaptopropionic acid, thiopropanoic acid, mercaptopropionic acid, and thiolactic acid. The flotation depressant provided by the present invention is economical to use and easy to add, effectively achieving efficient separation of molybdenite and chalcopyrite. Furthermore, the flotation depressant successfully solves the problem of excessive copper impurities in molybdenum concentrate when using only sodium thioglycolate, thereby reducing the overall cost of the depressant during flotation. The flotation depressant is not only highly efficient, but also clean and safe, effectively solving the difficulties in the separation of chalcopyrite and molybdenite.

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.

The present invention relates to a high-efficiency flotation separation method for complex copper-iron sulfide ore, and belongs to the technical field of flotation reagents. A combined collector is prepared, wherein the components of the combined collector are composed of 75-80 parts of aminotrimethylenephosphonic acid, 10-15 parts of xanthate, 5-10 parts of ethylthiocarbamate, and 0.5-1 part of polyol fatty acid ester, and the mass concentration of the combined collector is 30-50%; pulping, adding 200-800g / t of sulfiding agent to the complex copper-iron sulfide ore, grinding the ore to a fineness of -0.074mm accounting for 65-90%, and then pulping to a slurry with a solid concentration of 25-40wt%; flotation, subjecting the slurry with a solid concentration of 25-40wt% to a flotation operation of one coarse, three-four fine, and two-three sweeps to obtain copper concentrate and sulfur tailings, wherein the combined collector is used in the flotation process of the one coarse, three-four fine, and two-three sweeps. The present invention develops a new type of combined collector as a flotation agent for efficiently separating chalcopyrite and pyrite minerals, thereby achieving excellent flotation separation effect of complex copper-iron sulfide minerals in a slurry under low-alkali conditions.

This invention relates to the field of mineral processing technology, specifically to an environmentally friendly copper-molybdenum separation inhibitor, its preparation method, and its application. The method includes: mixing starch and formamide, stirring at room temperature, cooling in an ice-water bath at -5°C, slowly adding chlorosulfonic acid at this temperature to initiate a sulfonation reaction, neutralizing to pH 7-8 with sodium hydroxide solution after the reaction, adding anhydrous methanol to precipitate the product, and washing and drying to obtain the sulfonated anionic starch polymer DGSS. The inhibitor is applied to the flotation separation of copper-molybdenum mixed concentrates, combined with a closed-circuit process of one roughing, one scavenging, and four cleaning stages, employing a gradient reagent reduction and staged kerosene replenishment system from roughing to cleaning. This allows for selective inhibition of copper sulfide minerals such as chalcopyrite at extremely low dosages, with minimal impact on the floatability of molybdenite. It completely avoids the use of toxic substances such as cyanide, Knox reagent, or sodium sulfide, exhibiting good selectivity, low reagent consumption, environmental friendliness, and a simple preparation process that is easy to industrialize.

The invention relates to an inhibitor for efficiently separating copper and sulfur under a low-alkalinity condition, a flotation reagent and a flotation method. The inhibitor is a compound as shown in a formula I (formula I), wherein R1, R2, R3 and R4 are respectively and independently selected from one of-R5X,-X,-H and-N + R6, R5 is alkyl of C1-C10, naphthenic base of C3-C10 or heterocyclic group of C3-C10, and the ring of the heterocyclic group is provided with or not provided with a substituent group; x is one of F, Cl, Br, I, tertiary amine positive ions, nitro, cyano, sulfo, formyl, acyl and carboxyl; r6 is a C1-C5 alkyl group or a C3-C5 cycloalkyl group; the inhibitor is low in viscosity and good in fluidity, pyrite and chalcopyrite in complex copper sulfide ore copper-sulfur ore can be effectively separated under the low-alkalinity condition, and the separation effect is remarkable.

This invention belongs to the field of mineral flotation technology, and discloses a flotation collector for non-ferrous metal sulfide ores, its preparation method, and its application. The collector uses O,O-dialkyldithiophosphate as a starting material, and reacts sequentially with a halocarboxylic acid ester, hydrazine hydrate, potassium hydroxide, and carbon disulfide in anhydrous ethanol in a three-step reaction to obtain the target product, O,O-dialkyldithiophosphate hydrazide-N′-dithiocarbamate potassium. Its molecular structure simultaneously contains three active groups: a dithiophosphate group, an hydrazide group, and a dithiocarbamate group. This invention achieves efficient process connection and smooth transition by optimizing the material ratio, temperature, and time of each reaction step, and has advantages such as mild reaction conditions, simple operation, few side reactions, high yield, and stable product. The prepared collector exhibits excellent collecting performance and good selectivity for non-ferrous metal sulfide ores such as chalcopyrite, and is suitable for widespread application in sulfide ore flotation processes.

The present invention relates to a quantum dot synthesis method for synthesizing chalcopyrite-based quantum dots, the quantum dot synthesis method comprising: a nanoparticle production step for reacting a group I element and a group VI element to produce nanoparticles; and a cation diffusion step for diffusing group III element cations into the nanoparticles by heat treatment. Accordingly, there is provided a method for synthesizing quantum dots having good light-emitting characteristics having uniform particle diameters but not having compositional inhomogeneity.

The present application relates to the technical field of mineral flotation reagent, in particular to a chalcopyrite flotation composite collector and application thereof; the chalcopyrite flotation composite collector is prepared by mixing a first collector and a second collector at a mass ratio of 5-7:1.0-1.5; the prepared first collector is applied to the field of chalcopyrite flotation, and has good flotation performance and higher selectivity, and significantly improves the recovery rate of chalcopyrite flotation; the obtained second collector contains multiple sulfur-containing and oxygen-containing functional groups in the molecule, has good collecting ability and selectivity for chalcopyrite, and can significantly improve the flotation recovery rate of chalcopyrite; in addition, the mutual cooperation between the first collector and the second collector can further improve the recovery rate and grade of chalcopyrite; under the condition of adding a small amount of lime, a copper concentrate with high copper grade is obtained, the pH value of tailing backwater is also greatly reduced, the alkalinity standard requirement of direct discharge of backwater is met, and the sustainable development of the environment is beneficial.

The application discloses a magnetic separation process for separating fine-grained copper-molybdenum mixed concentrate, and comprises the following steps: roasting and deoiling the fine-grained copper-molybdenum mixed concentrate to obtain copper-molybdenum mixed dry concentrate; preparing a slurry by mixing the copper-molybdenum mixed dry concentrate and water, and sequentially adding an inhibitor, a magnetic intensifier, a strong oxidant and an adjusting agent into the slurry to obtain a copper-molybdenum mixed slurry; and feeding the copper-molybdenum mixed slurry into a wet high-intensity magnetic separator to perform copper-molybdenum magnetic separation, so as to obtain copper concentrate and molybdenum concentrate. The inhibitor, the magnetic intensifier, the strong oxidant and the adjusting agent jointly solve the problem of easy agglomeration of chalcopyrite and molybdenite. During the magnetic separation process of the wet high-intensity magnetic separator, a large amount of flushing water needs to be added, and the reagents on the surface of the copper concentrate can be washed away by the flushing water, so that a good reagent removal effect can be achieved. The obtained magnetic separation concentrate is copper concentrate (copper content is greater than or equal to 12%), which not only increases the economic benefit of the product, but also improves the resource utilization rate.

The application provides a high-efficiency foaming agent suitable for argillaceous porphyry copper ore in high-cold regions and a preparation method and application thereof. The high-efficiency foaming agent suitable for argillaceous porphyry copper ore in high-cold regions is composed of mixed alcohols, pine oil, sulfur-nitrogen esters, diesel oil, xanthate and a surfactant. The high-efficiency foaming agent suitable for argillaceous porphyry copper ore in high-cold regions is simple in preparation method, does not produce intermediate products, has low irritation, is friendly to the environment, has low dosage of the medicament compared with traditional single foaming agent, has stable foam properties, and can also assist in collecting some chalcopyrite, molybdenite and other sulfide ores. Within the range of the component allocation, the foaming agent can fully exert the synergistic effect of each component. In a high-altitude environment (altitude >= 3500m), the foaming capacity and foaming rate of the foaming agent are obviously superior to those of traditional foaming agents.

The invention discloses a method for preparing high-purity molybdenum disulfide through impurity removal of low-grade molybdenum concentrate, and belongs to the technical field of mineral purification and comprehensive utilization of resources. The method comprises two key steps of chloridizing roasting of a microwave reinforced composite chloridizing agent and double-frequency ultrasonic reinforced acid leaching. Firstly, a low-temperature co-melting system is constructed through a composite chlorinating agent, the chlorination reaction temperature is remarkably reduced, selective chlorination conversion of impurities is achieved under the action of a microwave field, and the impurities such as chalcopyrite and pyrite which are difficult to effectively remove through a conventional method are converted into chlorides easy to remove; and therefore, the impurity removal difficulty of the subsequent leaching procedure is greatly reduced. And then, double-frequency ultrasonic synergistic enhancement is introduced in the acid leaching process, and deep purification of the minerals is achieved through the surface purification effect of high-frequency ultrasonic and structural dissociation and mass transfer enhancement of low-frequency ultrasonic. According to the method, the removal efficiency of impurities such as iron, copper and silicon in the low-grade molybdenum concentrate can be remarkably improved, the removal rates of the iron, the copper and the silicon all reach 98% or above, and particularly the technical problem that the impurities of the chalcopyrite are difficult to remove efficiently is solved.

The application discloses a method for lime-free and acid-free copper-sulfur flotation separation, wherein a combined inhibitor for copper-sulfur separation comprises ferrous sulfate and amygdalin, and is used as a pyrite inhibitor in flotation separation of chalcopyrite and pyrite.The combined inhibitor ferrous sulfate and amygdalin, a collector and a foaming agent are added to a raw ore after crushing and grinding to perform a copper flotation operation, and after the copper flotation operation, a combined activator sodium percarbonate and copper sulfate, a combined collector and a foaming agent are added to the ore pulp to perform a sulfur flotation operation.The combined inhibitor ferrous sulfate and amygdalin has a strong inhibiting effect on pyrite, and can effectively realize flotation of chalcopyrite; the combined activator sodium percarbonate and copper sulfate has a good de-inhibiting and activating effect on pyrite, and can effectively realize flotation of pyrite, thereby reducing the mineral processing cost while enhancing the copper-sulfur separation effect, and having a good application prospect.

The application discloses a combined collector for chalcopyrite flotation and application of the combined collector in chalcopyrite flotation, and also discloses a preparation method of the combined collector, and belongs to the technical field of flotation separation of mineral processing. The combined collector is prepared by mixing ethion and an emulsifier according to a certain proportion and water, and then dispersing the mixture in an ultrasonic crusher to form a stable light yellow emulsion. The emulsion can be applied to the flotation process of chalcopyrite, and under the condition of obtaining similar flotation indexes, the combined collector of the application can be used in a significantly reduced amount compared with the amount of ethion, thereby effectively reducing the consumption of reagents, improving production efficiency, and reducing carbon emission in the separation process by reducing the amount of reagents.

A novel bis-ligand chalcopyrite collector and a preparation method and application thereof. The collector is prepared by first synthesizing an intermediate oxalyl diisothiocyanate from oxalyl chloride and thiocyanate, and then reacting the intermediate with an amine or an alcohol using a one-pot method. The collector provided by the present disclosure can form more stable dual-site adsorption on the chalcopyrite surface, thereby generating a more stable double-chelate-ring structure than the single-site adsorption of a traditional chalcopyrite collector such as xanthate and dithiophosphate. The collector not only has higher collection ability and excellent selectivity, but also can achieve efficient copper-sulfur separation even under a low-alkalinity condition. The preparation process of the collector is simple and operable, facilitating the flotation of chalcopyrite and its separation from pyrite.

The invention discloses an organic inhibitor for galena and application of the organic inhibitor. The inhibitor is 3-mercapto-1 sodium propane sulfonate (MPS). Aiming at the characteristics of close copper and lead symbiosis, high iron and zinc content and fine disseminated particle size of raw ore, the method adopts the technological process of'copper and lead partial bulk flotation tailing discarding-bulk concentrate regrinding-copper and lead separation flotation ', and comprises the following steps: firstly, in a bulk flotation section, utilizing a zinc sulfate and sodium sulfite combined reagent to efficiently inhibit sphalerite and pyrite under a weakly alkaline condition; a large number of gangue and zinc-sulfur minerals are thrown away in advance; the method comprises the following steps of: carrying out superfine regrinding dissociation on obtained bulk concentrate, then carrying out separation operation, and in a copper-lead separation section, replacing traditional dichromate with 3-mercapto-1 sodium propane sulfonate (MPS), carrying out a closed-loop process of one-roughing, three-refining and three-sweeping, and supplementing an inhibitor in fine selection operation, so that efficient inhibition of galena and preferable flotation of chalcopyrite are realized. The technological process is rigorous in design, the reagent system is green and environmentally friendly, and the resource recovery rate of the low-grade complex ore is remarkably increased.

The present invention discloses C 14 The invention discloses a method for regulating acidophilic bacteria leaching, which belongs to the field of biological leaching technology. The invention finds that different types of AHL signal molecules can have different effects on the growth and leaching of acidophilic bacteria at different concentrations and different addition times. The signal molecule control experiment confirms that C 14 At certain concentrations, the HSL signal molecule can promote and enhance the production of extracellular polysaccharides and fulvic acid by the strain, as well as its ability to adhere to minerals in the later stages of leaching, thereby increasing the strain's growth rate and mineral leaching efficiency. By regulating the concentration of the signal molecule, the rate of acidophilic leaching and its growth can be adjusted. This method is simple to operate, has low production costs, and is environmentally friendly. This method solves the problem of difficult control during mixed acidophilic leaching, promotes the industrial development of biometallurgical technology, and improves leaching production efficiency.

This invention discloses a flotation separation method for high-sulfur copper-zinc ore beneficiation, comprising the following steps: Step a. Classifying and grinding the high-sulfur copper-zinc ore, controlling the grinding fineness to ensure that the product particle size P80 is 120μm to 150μm; Step b. Performing a first-stage copper-zinc mixed flotation operation on the obtained grinding product: adding lime during the flotation process at a rate of 100g / t to 200g / t to adjust the pH value of the pulp to the range of 7.5 to 8.5, forming surface statics between chalcopyrite, sphalerite, and pyrite. Potential difference; an aerated flotation machine is used as the flotation equipment, and the selective collector O-ethyl-N-benzoyl thiocarbamate is added at a dosage of 25g / t to 30g / t for aerated flotation to obtain a copper-zinc-sulfur mixed concentrate; step c. the obtained copper-zinc-sulfur mixed concentrate is fed into a vertical spiral stirred mill for regrinding, and the regrinding fineness is controlled to P90≤20μm to achieve full mineral liberation and surface desorption; this invention can achieve precise separation of copper, zinc and sulfur, reduce costs and improve efficiency and increase the comprehensive utilization rate of resources.

The application discloses a method for chalcopyrite and enargite flotation separation and enrichment, and belongs to the technical field of ore dressing. The method realizes selective flotation separation of chalcopyrite and enargite through the combined action of hydrogen peroxide oxidation modification-sodium sulfite desorption collector, and obtains high-arsenic copper concentrate. Then, the method realizes effective enrichment of chalcopyrite through the desorption activation-high-efficiency collector strong collection technology, and obtains low-arsenic copper concentrate. The method is simple, easy for industrial production, and has good copper and arsenic separation and enrichment effects. The copper grade of the low-arsenic copper concentrate is greater than 23%, the arsenic content is less than 0.5%, the arsenic content of the high-arsenic copper concentrate is greater than 8%, and the total copper recovery rate is greater than 90%.

The present invention discloses a pyrite flotation separation combined inhibitor and its application, and belongs to the field of mineral processing technology. The pyrite flotation separation combined inhibitor of the present invention comprises gardenia yellow and inhibitor A; the inhibitor A is one of lime, sodium sulfite, and calcium hypochlorite. The combined inhibitor selectively inhibits pyrite and has no inhibitory effect on chalcopyrite. Therefore, the pyrite flotation separation combined inhibitor is applied to the flotation of copper sulfide ores. At the same time, the present invention adopts a branched series flow process to artificially improve the grade of the selected product, improve the sorting process, and save drug consumption and energy consumption. The present invention combines the combined inhibitor, combined collector and process flow to achieve effective separation of chalcopyrite and pyrite, and improve the indicators of copper sulfide ores.

The application relates to a combined collector for high-arsenic chalcopyrite flotation and application thereof, and belongs to the technical field of mineral flotation separation. ‑ The combined collector is prepared by combining a flotation reagent with R-OCSS functional groups and a flotation reagent with R-NCS functional groups, wherein R is a hydrocarbon group with 2-4 carbon atoms. Meanwhile, the application also provides an application method of the combined collector in high-arsenic chalcopyrite flotation. Under the condition of the same amount of reagent, the combined collector has better selectivity and separation efficiency, can greatly improve the recovery grade and recovery rate of chalcopyrite, can better utilize mineral resources, improve the benefit, and reduce the pollution to the environment.

The invention discloses a polycarboxylic sulfur-nitrogen carboxylic ester compound as well as a preparation method and application thereof. The polycarboxylic sulfur-nitrogen carboxylic ester compound has a structure of R1-S-C (= S)-N-R2-COOR3, and in the structure, R1 is a C1-C5 carboxyl group, R2 is a C1-C6 alkyl group, and R3 is any one of H < + > or a C1-C6 alkyl group. When the polycarboxylic sulfur-nitrogen carboxylate compound is added into a copper-molybdenum mixed ore flotation system, copper minerals can be selectively inhibited under the weakly alkaline condition. Compared with a traditional inhibitor, the multi-carboxyl sulfur-nitrogen carboxylic ester compound has the outstanding advantages that the synthesis route is simple, raw materials are easy to obtain, and the environment compatibility is excellent, the surface wettability difference of copper-molybdenum minerals can be remarkably enlarged through the selective inhibition effect of the compound, and efficient separation of chalcopyrite and molybdenite in associated ore is achieved.

The application discloses a method for separating copper-molybdenum mixed concentrate by advanced oxidation flotation, which comprises the following steps: S1, adding the copper-molybdenum mixed concentrate into a flotation tank with water, and adding peroxysulfate; S2, adding a divalent iron salt to the treated ore pulp, and then adding a collector and a foaming agent, so as to obtain a molybdenum rough concentrate and a copper rough concentrate by flotation; and S3, obtaining a molybdenum concentrate by 4-5 times of cleaning of the molybdenum rough concentrate, and obtaining a copper concentrate by 2-3 times of scavenging of the copper rough concentrate. By adding the peroxysulfate and the divalent iron salt, the application can generate sulfate radicals SO4 ‑ · and hydroxyl radicals ·OH, which have the characteristics of high activity and strong oxidizing property, can effectively decompose organic collectors in the copper-molybdenum mixed concentrate, and can reduce the difficulty of copper-molybdenum separation; and can also oxidize chalcopyrite to generate hydrophilic substances such as oxides and sulfates on the surface of the chalcopyrite, so that the chalcopyrite is inhibited; and the hydrophobicity of molybdenite can be restored by adding the collector, so that the copper-molybdenum efficient and clean flotation separation can be realized.

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.

The present invention discloses a combined inhibitor for sphalerite and its application. The combined inhibitor includes a reducing substance and anthocyanin. As a combined inhibitor for sphalerite, it is used in the flotation separation of chalcopyrite and sphalerite or galena and sphalerite. After the raw ore is crushed and ground, a combined collector and a frother are added to the pulp to carry out copper-zinc or lead-zinc flotation operation. During the copper-zinc or lead-zinc separation operation, the combined inhibitor is added as a sphalerite inhibitor, isoamyl xanthate is used as a chalcopyrite or galena collector, and No. 2 oil is used as a frother. The foam product is a copper concentrate or a lead concentrate, and the bottom tank product is a zinc concentrate. The combined inhibitor of the present invention has a strong inhibitory effect on sphalerite and can effectively achieve the flotation separation of chalcopyrite and sphalerite or galena and sphalerite. The reducing substance can enhance the inhibitory effect of anthocyanin on sphalerite and reduce the amount of anthocyanin used, thereby improving the separation effect of copper-zinc and lead-zinc sulfide ores while reducing the mineral processing cost.

The application discloses a method for selectively separating chalcopyrite and pyrite, and belongs to the field of mineral separation. First, lime is added to adjust the pH to 9-10 during grinding, then ethanolamine and isoamyl xanthate are added into the slurry as a combined collector I, wherein the ethanolamine has the function of a foaming agent, and under the condition of one roughing, three scavenging and two cleaning, a copper concentrate is obtained. The combined collector I has good synergistic effect, and has the advantages of considering the collecting property, selectivity and foaming property, reducing the amount of the inhibitor lime, and not needing to add a foaming agent, and can selectively and efficiently separate copper-sulfur minerals.