Method for flotation separation of copper-sulfur minerals by using advanced oxidation technology

Abstract

The invention discloses a method for flotation separation of copper-sulfur minerals by using an advanced oxidation technology, and belongs to the technical field of mineral separation. The method comprises the following steps: a, crushing, screening and grinding the copper-sulfur ore, and then adding water to prepare ore pulp; b, a composite Fenton-like oxidizing agent, sodium hydroxide, a collecting agent and a foaming agent are sequentially added into the ore pulp, copper roughing is conducted, and foam and in-tank products are obtained; c, a composite Fenton-like oxidizing agent, sodium hydroxide, a collecting agent and a foaming agent are sequentially added into the in-tank product obtained in the step b, copper scavenging is conducted, foam and the in-tank product are obtained, and the in-tank product is final tailings; d, the foam obtained in the step b and the foam obtained in the step c are combined, a composite Fenton-like oxidizing agent and sodium hydroxide are added, copper concentration is conducted, and copper concentrate is obtained; the composite Fenton-like oxidizing agent is obtained by compounding acidic mine wastewater and peroxymonosulfate; and isoamyl xanthate is adopted as a collecting agent. According to the method, selective flotation separation of copper and sulfur minerals under the low-alkalinity condition can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of ore dressing, and more specifically, to a method for flotation separation of copper and sulfur minerals by using advanced oxidation technology. Background Art

[0002] Copper, as a strategic metal for the modern industrial foundation, is irreplaceable in key fields such as aerospace, national defense, and new energy equipment. Sulfide copper ore is the main source for obtaining copper metal. Due to the highly similar natural floatability of chalcopyrite, the copper-containing mineral, and associated pyrite, it is difficult to selectively flotation separate copper and sulfur, and the concentrate products contain each other seriously. This not only affects the process indexes of copper smelting, but also causes waste of strategic resources. Therefore, the efficient separation of copper and sulfur ores has become a typical problem in the field of modern mineral processing.

[0003] At present, the lime high-alkali flotation process is generally adopted at home and abroad, which mainly has the following defects:

[0004] (1) The traditional lime process relies on a high-alkali environment and requires a large amount of lime to inhibit pyrite, resulting in high reagent costs, equipment scaling, low recovery rate of associated minerals, and decline in concentrate quality, as well as problems in wastewater treatment, which seriously restricts the sustainable development of the process.

[0005] (2) The traditional oxidant has poor selectivity and is difficult to accurately regulate the surface properties of minerals under low-alkali conditions, easily causing over-oxidation of chalcopyrite or activation of pyrite, resulting in a decrease in copper recovery rate and an excessive sulfur content.

[0006] (3) The traditional butyl xanthate collector has insufficient selectivity, requires excessive addition and is easily interfered by slime, resulting in low separation efficiency. Summary of the Invention

[0007] In view of the above technical problems, the present invention provides a method for flotation separation of copper and sulfur minerals by using advanced oxidation technology. This method uses metal ions in acid mine wastewater to synergistically catalyze peroxymonosulfate to generate highly active free radicals for selective oxidation modification, and then cooperates with the efficient collection of collectors, etc., to achieve the selective flotation separation of copper and sulfur minerals under low-alkali conditions.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A method for flotation separation of copper and sulfur minerals by using advanced oxidation technology, comprising the following steps:

[0010] a. Crushing and screening copper-sulfur ore to obtain raw materials for grinding; grinding the raw materials for grinding to obtain grinding products; then adding water to the grinding products to prepare pulp;

[0011] b. Sequentially adding a composite Fenton oxidant, sodium hydroxide, a collector, and a foaming agent to the pulp in step a for rough copper selection to obtain foam and tank products;

[0012] c. Sequentially add a composite Fenton oxidant, sodium hydroxide, a collector, and a frother to the product in the cell obtained in step b, and perform copper scavenging to obtain foam and a product in the cell, and this product in the cell is the final tailings;

[0013] d. Combine the foams obtained in steps b and c, add a composite Fenton oxidant and sodium hydroxide, and perform copper cleaning to obtain copper concentrate;

[0014] The above-mentioned composite Fenton oxidant is obtained by compounding acidic mine wastewater and persulfate; the collector is isopentyl xanthate.

[0015] Preferably, in step a: the copper-sulfur ore is a low-grade copper sulfide ore; the raw material for grinding is ore with a particle size of -5 mm; the fineness of the grinding product is controlled such that the content of ore powder with a particle size of -0.074 mm accounts for 70-80%; the mass percentage concentration of the pulp is 25-35%.

[0016] Preferably, in the acidic mine wastewater, the concentration range of sulfate ions is 3000-5000 mg / L, the concentration range of iron ions is 700-900 mg / L, and the concentration range of copper ions is 100-200 mg / L.

[0017] Preferably, in step b: the composite Fenton oxidant is obtained by compounding 1.5-2 m 3 / t of acidic mine wastewater and 500-700 g / t of persulfate; add sodium hydroxide to adjust the pH of the slurry to 8.5±0.2; the addition amount of isopentyl xanthate is 50-70 g / t; the frother is No. 2 oil, and the addition amount is 5-7 g / t.

[0018] Preferably, in step c: the composite Fenton oxidant is obtained by compounding 0.5-0.7 m 3 / t of acidic mine wastewater and 200-400 g / t of persulfate; add sodium hydroxide to adjust the pH of the slurry to 8.5±0.2; the addition amount of isopentyl xanthate is 20-40 g / t; the frother is No. 2 oil, and the addition amount is 5-7 g / t.

[0019] Preferably, in step d, copper cleaning is carried out in a mixed cleaning manner, and the specific steps are as follows:

[0020] d1. Add a composite Fenton oxidant and sodium hydroxide to the combined foam, and perform copper-sulfur mixed cleaning I to obtain foam and a product in the cell, and the product in the cell is returned to step b for copper roughing again;

[0021] d2. Add a composite Fenton oxidant and sodium hydroxide to the foam obtained from the first stage of copper-sulfur bulk concentration in step d1, conduct the second stage of copper-sulfur bulk concentration to obtain foam and in-tank products, and return the in-tank products to step d1 to conduct the first stage of copper-sulfur bulk concentration operation again;

[0022] d3. Add a composite Fenton oxidant and sodium hydroxide to the foam obtained from the second stage of copper-sulfur bulk concentration in step d2, conduct the third stage of copper-sulfur bulk concentration to obtain copper concentrate and in-tank products, and return the in-tank products to the second stage of copper-sulfur bulk concentration operation.

[0023] Preferably, in step d1: the composite Fenton oxidant is prepared by compounding 0.2 - 0.3 m 3 / t of acidic mine wastewater with 100 - 150 g / t of persulfate; add sodium hydroxide to adjust the pH of the slurry to 8.5 ± 0.2;

[0024] In step d2: the composite Fenton oxidant is prepared by compounding 0.1 - 0.2 m 3 / t of acidic mine wastewater with 50 - 100 g / t of persulfate; add sodium hydroxide to adjust the pH of the slurry to 8.5 ± 0.2;

[0025] In step d3: the composite Fenton oxidant is prepared by compounding 0.05 - 0.1 m 3 / t of acidic mine wastewater with 30 - 50 g / t of persulfate; add sodium hydroxide to adjust the pH of the slurry to 8.5 ± 0.2.

[0026] The beneficial technical effects of the present invention are as follows:

[0027] (1) The present invention resourcefully utilizes the transition metals in acidic mine wastewater as catalysts to activate persulfate (PMS) to induce Fenton-like reactions, generating highly active sulfate radicals (SO4ˉ·) and hydroxyl radicals (·OH). The method of using advanced oxidation technology for flotation separation of copper and sulfur minerals has high flotation efficiency, can achieve selective flotation separation of copper and sulfur minerals under low-alkalinity conditions, and improves the quality and recovery rate of copper concentrate. The present invention also has the remarkable characteristics of high oxidation potential, strong pH adaptability, and little environmental pollution.

[0028] (2) The present invention can effectively achieve copper-sulfur separation in a low-alkaline environment, solving the problems of easy scaling, consolidation, pipeline blockage, and equipment corrosion caused by high alkalinity and large amounts of lime added in traditional copper-sulfur separation.

[0029] (3) The composite Fenton-like oxidant used in the present invention promotes the passivation modification of the pyrite surface through oxidation modification, characteristic adsorption, etc., causing the coverage of hydrophilic species of multiple components of iron and sulfur on the mineral surface, significantly reducing the floatability of pyrite. In combination with the collector isopentyl xanthate, it has good selectivity for chalcopyrite, and can reduce the entrainment of pyrite in the copper-preferential flotation foam during the copper-sulfur separation process.

[0030] (4) Compared with the traditional lime high-alkali process, the copper grade of the method of the present invention is increased by 1-3%, and the copper recovery rate is increased by 1-5%. The present invention also has the advantages of no pollution, simple preparation process, strong operability, etc., and realizes the resource utilization of wastewater. Description of the Drawings

[0031] Figure 1 It is the process flow chart of the method for flotation separation of copper and sulfur minerals by using the advanced oxidation technology of the present invention. Detailed Embodiments

[0032] Aiming at the technical problems in the copper-sulfur flotation separation, based on the different antioxidant abilities of the surfaces of chalcopyrite and pyrite, the present invention improves the decomposition activity of peroxymonosulfate (PMS) through the synergistic catalysis of metal ions in acid mine drainage (AMD), and then generates highly reactive oxidation species (SO4ˉ· / ·OH), promoting the selective oxidation modification of the surfaces of chalcopyrite and pyrite, realizing the stable coverage of strongly hydrophilic species on the pyrite surface, and then combining with the characteristic adsorption of the highly selective collector isopentyl xanthate to strengthen the efficient separation of the two at low alkalinity. It can be seen that the present invention innovatively proposes a new idea of AMD synergistic catalysis of PMS selective oxidation modification - collector efficient collection - low-alkalinity copper-sulfur flotation separation. The present invention will provide a theoretical basis and technical support for the efficient separation of copper-sulfur ores and the resource utilization of mine wastewater in China, and has important practical significance for the efficient utilization of polymetallic sulfide ore resources in China.

[0033] Specifically, for low-grade copper sulfide ore resources, after crushing and screening, the ore with a particle size of -5 mm is obtained as the raw material for grinding. The raw ore is ground to -0.074 mm with 70%-80% passing through, and then the pulp concentration is adjusted to 25%-35%. A composite Fenton-like reagent that uses transition metals in acid mine drainage (AMD) to synergistically catalyze peroxymonosulfate (PMS) to generate highly reactive sulfate radicals (SO4ˉ·) and hydroxyl radicals (·OH) is used as an inhibitor. Sodium hydroxide is used to adjust the pH to 8.5±0.2, isopentyl xanthate is used as a collector, and No. 2 oil is used as a frother. Through copper-sulfur bulk rougher flotation, copper-sulfur bulk scavenger flotation, and three-stage copper-sulfur separation and cleaning, with the middlings returned in sequence, copper concentrate and tailings products are obtained. The results show that through the reasonable addition of reagents and the resource utilization of AMD, the present invention gives full play to the synergistic effect of advanced oxidation technology for selectively oxidizing pyrite and the efficient collection of chalcopyrite by the collector, improving the quality and recovery rate of copper concentrate, and providing important technical support for the efficient utilization of resources and the construction of green mines.

[0034] The present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] The present invention provides a method for flotation separation of copper and sulfur minerals using advanced oxidation technology. First, the raw ore is ground, and a Fenton-like reagent obtained by synergistically catalyzing peroxymonosulfate with acid mine drainage is used as an inhibitor for copper-sulfur separation, isopentyl xanthate is used as a collector, and No. 2 oil is used as a frother. One-stage copper-sulfur rougher flotation, one-stage copper-sulfur scavenger flotation, and three-stage copper-sulfur separation and cleaning are carried out to obtain tailings and copper concentrate respectively.

[0037] The target elements in the copper-sulfur ore are copper, iron, and sulfur, with grades of 0.38%, 12.87%, and 8.92% respectively. Its mineral composition is as follows: the content of chalcopyrite is 0.8%, which is the main copper mineral in the ore; the content of pyrite is 23.8%, which accounts for the largest proportion in the sulfur iron ore, and the sulfur iron ore also contains trace amounts of marcasite; other iron-containing minerals include siderite and limonite (0.3%); the gangue minerals are mainly quartz (50.8%), and also contain a small amount of silicate gangue minerals such as epidote and sericite. The analysis results of the original ore copper phase show that it is mainly copper sulfide ore (96.5%), contains a small amount of copper oxide ore, and belongs to low-grade copper sulfide ore.

[0038] This example provides a method for flotation separation of copper and sulfur minerals using advanced oxidation technology under low-alkali conditions, which specifically includes the following steps:

[0039] (1) The raw ore is crushed and ground to a powder content of 70% with a particle size of -0.074 mm, and then water is added to obtain a pulp, and the mass concentration of the pulp is 30%.

[0040] (2) Sequentially add a composite Fenton oxidant (1.8 m 3 / t acidic mine wastewater combined with 600 g / t persulfate) to step (1), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, add 60 g / t of the collector isopentyl xanthate, and 6 g / t of the foaming agent No. 2 oil, and conduct rough flotation of copper and sulfur to obtain foam and in-tank products.

[0041] (3) Add a composite Fenton oxidant (0.6 m 3 / t acidic mine wastewater combined with 300 g / t persulfate) to the in-tank products obtained from the rough flotation of copper and sulfur in step (2), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, add 30 g / t of the collector isopentyl xanthate, and 3 g / t of the foaming agent No. 2 oil, and conduct scavenging flotation of copper and sulfur to obtain foam and in-tank products. The in-tank products are the tailings.

[0042] (4) Add a composite Fenton oxidant (0.3 m 3 / t acidic mine wastewater combined with 150 g / t persulfate) to the foam obtained from the rough separation and scavenging flotation of copper and sulfur in steps (1) and (2), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, and conduct rough cleaning I of copper and sulfur to obtain foam and in-tank products. The in-tank products are returned to the rough separation operation of copper and sulfur.

[0043] (5) Add a composite Fenton oxidant (0.2 m 3 / t acidic mine wastewater combined with 100 g / t persulfate) to the foam obtained from the rough cleaning I of copper and sulfur in step (4), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, and conduct rough cleaning II of copper and sulfur to obtain foam and in-tank products. The in-tank products are returned to the rough cleaning I operation of copper and sulfur.

[0044] (6) Add a composite Fenton oxidant (0.1 m 3 / t acidic mine wastewater combined with 50 g / t persulfate) to the foam obtained from the rough cleaning II of copper and sulfur in step (5), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, and conduct rough cleaning III of copper and sulfur to obtain foam and in-tank products. The in-tank products are returned to the rough cleaning II operation of copper and sulfur.

[0045] Test results: Using a Fenton-like oxidant as an inhibitor for copper-sulfur separation, after sorting according to the Figure 1 flotation process and reagent regime, the copper concentrate grade is 21.23%, and the copper recovery rate is 91.57%.

[0046] Example 2

[0047] The present invention provides a method for flotation separation of copper and sulfur minerals by using advanced oxidation technology. First, the raw ore is ground, and a Fenton-like reagent obtained by synergistically catalyzing persulfate with acidic mine wastewater is used as an inhibitor for copper and sulfur separation, isopentyl xanthate is used as a collector, and No. 2 oil is used as a foaming agent. One rough separation and one scavenging separation of copper and sulfur are carried out, and three cleaning separations of copper and sulfur are carried out to obtain tailings and copper concentrate respectively.

[0048] The target elements in the copper-sulfur ore are copper, iron and sulfur, with grades of 0.38%, 12.87% and 8.92% respectively. Its material composition is as follows: the content of chalcopyrite is 0.8%, which is the main copper mineral in the ore; the content of pyrite is 23.8%, which accounts for the largest proportion in the sulfur iron ore, and there is also a trace amount of marcasite in the sulfur iron ore; other iron-containing minerals include siderite and limonite (0.3%); the gangue minerals are mainly quartz (50.8%), and there are also a small amount of silicate gangue minerals such as epidote and sericite. The analysis results of the copper phase in the raw ore show that it is mainly copper sulfide ore (96.5%), contains a small amount of copper oxide ore, and belongs to low-grade copper sulfide ore.

[0049] This embodiment provides a method for flotation separation of copper and sulfur minerals under low-alkali conditions, which specifically includes the following steps:

[0050] (1) The raw ore is crushed and ground to a powder content of -0.074mm accounting for 70%, and water is added to obtain pulp, and the mass concentration of the pulp is 30%.

[0051] (2) Add a composite Fenton-like oxidant (1.6m 3 / t acidic mine wastewater combined with 800g / t persulfate) to step (1) in sequence, then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, add 60g / t of the collector isopentyl xanthate, and 6g / t of the foaming agent No. 2 oil, and carry out rough separation of copper and sulfur mixture to obtain foam and tank products.

[0052] (3) Add a composite Fenton-like oxidant (0.8m 3 / t acidic mine wastewater combined with 400g / t persulfate) to the tank products obtained from the rough separation of copper and sulfur mixture in step (2), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, add 30g / t of the collector isopentyl xanthate, and 3g / t of the foaming agent No. 2 oil, and carry out scavenging separation of copper and sulfur mixture to obtain foam and tank products. This tank product is the tailings.

[0053] (4) Add a composite Fenton-like oxidant (0.4m 3 / t acidic mine wastewater combined with 200 g / t persulfate), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, and conduct the first stage of copper-sulfur bulk flotation to obtain foam and in-cell product. The in-cell product is returned to the copper-sulfur separation rougher operation.

[0054] (5) Add a composite Fenton-like oxidant (0.2 m 3 / t acidic mine wastewater combined with 100 g / t persulfate) to the foam obtained from the first stage of copper-sulfur bulk flotation in step (4), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, and conduct the second stage of copper-sulfur bulk flotation to obtain foam and in-cell product. The in-cell product is returned to the first stage of copper-sulfur separation cleaning operation.

[0055] (6) Add a composite Fenton-like oxidant (0.1 m 3 / t acidic mine wastewater combined with 50 g / t persulfate) to the foam obtained from the second stage of copper-sulfur bulk flotation in step (5), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, and conduct the third stage of copper-sulfur bulk flotation to obtain foam and in-cell product. The in-cell product is returned to the second stage of copper-sulfur separation cleaning operation.

[0056] Test results: Using the composite Fenton-like oxidant as the copper-sulfur separation depressant, after separation according to the Figure 1 flotation process and reagent regime, the copper concentrate grade is 20.57% and the copper recovery rate is 89.65%.

[0057] Comparative Example 1

[0058] The specific ore dressing steps are as follows:

[0059] (1) The raw ore is crushed and ground to a powder content of -0.074 mm accounting for 70%, and water is added to obtain pulp with a mass concentration of 30%.

[0060] (2) Add 400 g / t of Fenton's reagent (100 g / t of ferrous sulfate, 300 g / t of hydrogen peroxide) to step (1), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, add 60 g / t of the collector ethyl xanthate, and 6 g / t of the frother No. 2 oil, and conduct copper-sulfur bulk rougher flotation to obtain foam and in-cell product.

[0061] (3) Add 200 g / t of Fenton's reagent (50 g / t of ferrous sulfate, 150 g / t of hydrogen peroxide) to the underflow obtained from the copper-sulfur bulk rougher flotation in step (2), then add sodium hydroxide to adjust the pulp pH = 8.5 ± 0.2, add 30 g / t of the collector ethyl xanthate, and 3 g / t of the frother No. 2 oil, and conduct copper-sulfur bulk scavenger flotation to obtain foam and in-cell product.

[0062] (4) Add Fenton's reagent at a dosage of 100 g / t (ferrous sulfate 25 g / t, hydrogen peroxide 75 g / t) to the foam obtained from the roughing and scavenging of copper-sulfur separation in steps (1) and (2). Then add sodium hydroxide to adjust the pulp pH to 8.5 ± 0.2, and conduct the first stage of copper-sulfur bulk concentration to obtain foam and in-cell product. The in-cell product is returned to the roughing operation of copper-sulfur separation.

[0063] (5) Add Fenton's reagent at a dosage of 60 g / t (ferrous sulfate 15 g / t, hydrogen peroxide 45 g / t) to the foam obtained from the first stage of copper-sulfur bulk concentration in step (4). Then add sodium hydroxide to adjust the pulp pH to 8.5 ± 0.2, and conduct the second stage of copper-sulfur bulk concentration to obtain foam and in-cell product. The in-cell product is returned to the first stage of copper-sulfur cleaning operation.

[0064] (6) Add Fenton's reagent at a dosage of 20 g / t (ferrous sulfate 5 g / t, hydrogen peroxide 15 g / t) to the foam obtained from the second stage of copper-sulfur bulk concentration in step (5). Then add sodium hydroxide to adjust the pulp pH to 8.5 ± 0.2, and conduct the second stage of copper-sulfur bulk concentration to obtain foam and in-cell product. The in-cell product is returned to the second stage of copper-sulfur cleaning operation.

[0065] Test results: Using traditional Fenton's reagent as the copper-sulfur separation inhibitor, after separation according to the Figure 1 flotation process and reagent regime, the copper concentrate grade is 19.62%, and the copper recovery rate is 88.31%.

[0066] In summary, compared with the traditional Fenton's reagent (Fe 2+ / H2O2) process, under the same low-alkali condition (pH 8.5 ± 0.2), the copper concentrate grade of the present invention is increased from 19.62% to 21.23%, and the copper recovery rate is increased from 88.31% to 91.57%. At the same time, through the resource utilization of AMD to replace ferrous sulfate, the reagent cost is significantly reduced. This breakthrough is due to the synergistic catalytic effect of multi-metal ions (Fe 2+ / Cu 2+ etc.) in AMD and PMS, generating SO4ˉ· / ·OH composite free radicals, preferentially oxidizing the surface of pyrite to form a hydrophilic layer, while the surface of chalcopyrite remains hydrophobic due to the formation on its surface, combined with the highly selective adsorption of isoamyl xanthate, realizing the precise separation of copper-sulfur minerals, and providing an innovative solution with both economic and environmental benefits for the green and efficient separation of low-grade copper ores.

Claims

1. A method for flotation separation of copper and sulfur minerals using advanced oxidation technology, characterized in that It includes the following steps: a. Crush and screen copper-sulfur ore to obtain raw materials for grinding; grind the raw materials for grinding to obtain grinding products; then add water to the grinding products to prepare pulp; b. Sequentially add a composite Fenton oxidant, sodium hydroxide, a collector, and a foaming agent to the pulp in step a for rough copper selection to obtain foam and products in the cell; c. Sequentially add a composite Fenton oxidant, sodium hydroxide, a collector, and a foaming agent to the products in the cell obtained in step b for scavenging copper to obtain foam and products in the cell, and the products in the cell are the final tailings; d. Combine the foam obtained in steps b and c, add a composite Fenton oxidant and sodium hydroxide, and conduct cleaning of copper to obtain copper concentrate; The above composite Fenton oxidant is obtained by compounding acidic mine wastewater and persulfate; the collector is isoamyl xanthate.

2. The method for flotation separation of copper and sulfur minerals by using advanced oxidation technology according to claim 1, characterized in that, In step a: The copper-sulfur ore is low-grade copper sulfide ore; the obtained raw materials for grinding are ores with a particle size of -5 mm; the fineness of the grinding products is controlled such that the content of ore powder with a particle size of -0.074 mm accounts for 70-80%; the mass percentage concentration of the pulp is 25-35%.

3. A method for flotation separation of copper sulfide minerals using advanced oxidation technology according to claim 1, characterized in that: The concentration range of sulfate ions in the acidic mine wastewater is 3000-5000 mg / L, the concentration range of iron ions is 700-900 mg / L, and the concentration range of copper ions is 100-200 mg / L.

4. A method for flotation separation of copper sulfide minerals using advanced oxidation technology according to claim 1, characterized in that, In step b: The composite Fenton oxidant is prepared by compounding 1.5 - 2 m of acidic mine wastewater per ton with 500 - 700 g of peroxysulfate per ton; adding sodium hydroxide to adjust the pH of the slurry to 8.5 ± 0.2; the addition amount of isopentyl xanthate is 50 - 70 g / t; the foaming agent is No. 2 oil, and the addition amount is 5 - 7 g / t. 3 / t is compounded with 500 - 700 g / t of persulfate; adding sodium hydroxide to adjust the pH of the slurry to 8.5 ± 0.2; the addition amount of isopentyl xanthate is 50 - 70 g / t; the foaming agent is No. 2 oil, and the addition amount is 5 - 7 g / t.

5. A method for flotation separation of copper-sulfur minerals using advanced oxidation technology according to claim 1, characterized in that, In step c: The composite Fenton oxidant is prepared by compounding 0.5 - 0.7 m of acidic mine wastewater per ton with 200 - 400 g of persulfate per ton; adding sodium hydroxide to adjust the pH of the slurry to 8.5 ± 0.2; the addition amount of isopentyl xanthate is 20 - 40 g / t; the foaming agent is No. 2 oil, and the addition amount is 5 - 7 g / t. 3 / t is compounded with 200 - 400 g / t of persulfate; adding sodium hydroxide to adjust the pH of the slurry to 8.5 ± 0.2; the addition amount of isopentyl xanthate is 20 - 40 g / t; the foaming agent is No. 2 oil, and the addition amount is 5 - 7 g / t.

6. A method for flotation separation of copper sulfide minerals by using advanced oxidation technology according to claim 1, characterized in that, In step d, the cleaning of copper adopts the method of combined cleaning, and the specific steps are as follows: d1. Add a composite Fenton oxidant and sodium hydroxide to the combined foam for the first combined cleaning of copper and sulfur to obtain foam and products in the cell, and the products in the cell are returned to step b for rough copper selection again; d2. Add a composite Fenton oxidant and sodium hydroxide to the foam obtained from the first combined cleaning of copper and sulfur in step d1 for the second combined cleaning of copper and sulfur to obtain foam and products in the cell, and the products in the cell are returned to step d1 for the operation of the first combined cleaning of copper and sulfur again; d3. Add a composite Fenton oxidant and sodium hydroxide to the foam obtained from the second combined cleaning of copper and sulfur in step d2 for the third combined cleaning of copper and sulfur to obtain copper concentrate and products in the cell, and the products in the cell are returned to the operation of the second combined cleaning of copper and sulfur.

7. A method for flotation separation of copper and sulfur minerals using advanced oxidation technology according to claim 6, characterized in that, In step d1: The composite Fenton oxidant is prepared by compounding 0.2 - 0.3 m of acidic mine wastewater per ton with 100 - 150 g of peroxysulfate per ton; sodium hydroxide is added to adjust the pH of the slurry to 8.5 ± 0.2; 3 / t and 100 - 150 g / t of persulfate; sodium hydroxide is added to adjust the pH of the slurry to 8.5 ± 0.2; In step d2: The composite Fenton oxidant is prepared by compounding 0.1 - 0.2 m of acidic mine wastewater 3 / t with 50 - 100 g / t of persulfate; adding sodium hydroxide to adjust the pH of the slurry to 8.5 ± 0.2; In step d3: The composite Fenton oxidant is prepared by compounding 0.05 - 0.1 m of acidic mine wastewater 3 / t with 30 - 50 g / t of persulfate; sodium hydroxide is added to adjust the pH of the slurry to 8.5 ± 0.2.

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