Arsenic-reducing and quality-improving method for micro-fine-particle high-arsenic copper concentrate

Abstract

The invention discloses an arsenic-reducing and quality-improving method for micro-fine-particle high-arsenic copper concentrate, and belongs to the technical field of mineral processing. The method comprises the following steps: (1) adding water into the micro-fine-particle high-arsenic copper concentrate for pulp mixing to obtain ore pulp; (2) adjusting the pH value of the ore pulp obtained in the step (1); and (3) glutathione is adopted as an inhibitor of arsenic mineral arsenopyrite, flotation is conducted on the ore pulp, and arsenic reduction and quality improvement of the micro-fine-particle high-arsenic copper concentrate are completed. According to the method, the micro-fine-particle high-arsenic copper concentrate is subjected to reagent removal, then glutathione is adopted as an inhibitor for flotation arsenic reduction, the problem that in the micro-fine-particle high-arsenic copper concentrate, due to the good floatability of micro-fine-particle arsenopyrite, chalcopyrite and arsenopyrite are separated is effectively solved, the arsenic content in the copper concentrate can be remarkably reduced, meanwhile, the high recovery rate of copper is guaranteed, and the method is suitable for industrial production. And an efficient and reliable new way is provided for flotation and arsenic reduction of the high-arsenic copper concentrate.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology and relates to a method for reducing arsenic and improving the quality of fine-grained high-arsenic copper concentrate. Background Technology

[0002] With the continued growth in global demand for copper resources, easily beneficiated copper ore resources are becoming increasingly depleted, leading to widespread attention being paid to the development and utilization of high-arsenic copper ore resources with fine-grained, complex, and difficult-to-process characteristics. After flotation enrichment, these ores often yield fine-grained high-arsenic copper concentrates. The copper minerals in these concentrates mainly exist in the form of chalcopyrite, while the arsenic-bearing minerals primarily exist in the form of arsenopyrite (arsene). Arsenic is an extremely harmful element; during copper smelting, arsenic volatilizes in forms such as arsenic trioxide, polluting the environment and posing a significant threat to human health. Therefore, how to economically and efficiently reduce the arsenic content in fine-grained high-arsenic copper concentrates, achieving "arsenic reduction and quality improvement" of copper resources, has become a key technical challenge urgently needing to be solved in the fields of mineral processing and metallurgy.

[0003] Using flotation to "reduce arsenic and improve quality" is one of the more common methods for processing high-arsenic copper concentrate. This method utilizes the differences in the surface physicochemical properties of chalcopyrite and arsenopyrite, selectively inhibiting arsenopyrite with flotation depressants to separate the two. However, since both arsenopyrite and chalcopyrite are sulfide minerals with similar natural floatability, and given the small particle size of fine-grained high-arsenic copper concentrate, flotation separation is inherently more difficult, leading to insufficient selective inhibition by conventional depressants and thus hindering copper-arsenic separation.

[0004] Currently, conventional depressants for arsenopyrite mainly include oxidation depressants, inorganic depressants, and organic depressants. Oxidation depressants, such as strong oxidants like potassium permanganate, sodium hypochlorite, and hydrogen peroxide, oxidize the surface of arsenopyrite, making it hydrophilic. However, these agents have poor selectivity and, while oxidizing arsenopyrite, also oxidize chalcopyrite to varying degrees, leading to a significant decrease in copper recovery. Furthermore, these agents are consumed in large quantities, resulting in high costs and potential equipment corrosion and environmental pollution. Inorganic depressants, such as lime (which produces Ca2+),... 2+ and OH - Lime, sulfonates, etc., are used to inhibit arsenopyrite. Lime requires high alkalinity to exert a certain degree of inhibition on arsenopyrite, and its inhibitory effect is often insufficient and unstable. Furthermore, a high-alkalinity environment also inhibits chalcopyrite and exacerbates the mud formation of silicate gangue minerals, worsening the flotation environment. Organic inhibitors include dextrin, tannic acid, and lignin sulfonates. These agents generally suffer from poor selectivity and require large dosages, making it difficult to ensure high chalcopyrite recovery while efficiently inhibiting arsenopyrite.

[0005] Therefore, it is necessary to provide a method for reducing arsenic and improving the quality of fine-grained high-arsenic copper concentrate, which can efficiently, greenly, and selectively inhibit arsenopyrite, promote the efficient reduction of arsenic and improvement of fine-grained high-arsenic copper concentrate, and realize the efficient utilization of high-arsenic copper ore resources. Summary of the Invention

[0006] To overcome the problems in the prior art, this invention uses glutathione as an inhibitor to selectively inhibit arsenopyrite in high-arsenic copper concentrate. Through a suitable flotation process, chalcopyrite and arsenopyrite are separated, thereby effectively removing the arsenopyrite mineral from the high-arsenic copper concentrate. This significantly reduces the arsenic mineral content in the resulting copper concentrate, improves the grade of the copper concentrate, and ensures a high copper recovery rate.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: This invention proposes a method for reducing arsenic and improving the quality of fine-grained high-arsenic copper concentrate, the method comprising the following steps: (1) Water is added to fine-grained high-arsenic copper concentrate to prepare a slurry; (2) Adjust the pH of the slurry obtained in step (1); (3) Glutathione was used as an inhibitor to float the slurry, thereby reducing arsenic content and improving the quality of fine-grained high-arsenic copper concentrate.

[0008] Preferably, in step (1), the mass of fine-grained high-arsenic copper concentrate accounts for 15% to 20% of the total mass of the slurry, and the mass of mineral particles with a diameter of -38 μm accounts for more than 90% of the total mass of the high-arsenic copper concentrate.

[0009] Preferably, in step (2), the pH of the slurry is adjusted to 5-6.

[0010] Preferably, in step (3), the flotation includes first performing two roughing processes on the slurry to obtain roughing concentrate and roughing tailings, then performing three consecutive fine processes on the roughing concentrate to obtain low-arsenic copper concentrate, and then performing two consecutive scavenging processes on the roughing tailings to obtain high-arsenic tailings.

[0011] Preferably, the specific process of the two coarse selections includes: A: First, the slurry is subjected to the first roughing process. During the first roughing process, 100~150g / t glutathione arsenic inhibitor, 80~100g / t Z200 collector, and 30~40g / t methyl isobutyl methanol frother are added. The roughing process lasts for 5~7 minutes to obtain the first roughing concentrate and the first roughing tailings.

[0012] B: Perform a second roughing process on the first roughing tailings obtained in step A. During the second roughing process, add 50-75 g / t glutathione arsenic inhibitor, 40-50 g / t Z200 collector, and 15-20 g / t methyl isobutyl methanol frother. Roughing for 4-6 minutes yields the second roughing concentrate and roughing tailings.

[0013] The first roughing concentrate and the second roughing concentrate are combined to obtain the roughing concentrate.

[0014] Preferably, the specific process of the three selections includes: a: The rough concentrate is subjected to a first cleaning process. During the first cleaning process, 50-60 g / t glutathione inhibitor and 10-20 g / t methyl isobutyl methanol frother are added and the cleaning process is carried out for 6-8 minutes to obtain the first cleaned concentrate and the first cleaned tailings.

[0015] In this process, the tailings from the first fine selection are returned to the first roughing process for cyclic flotation.

[0016] b: Perform a second fine-refinement on the first fine-refinement concentrate obtained in step a. During the second fine-refinement process, add 30-50 g / t glutathione inhibitor and 10-15 g / t methyl isobutyl methanol foaming agent, and fine-refine for 5-7 minutes to obtain the second fine-refinement concentrate and the second fine-refinement tailings.

[0017] In this process, the tailings from the second cleaning are returned to the first cleaning process for cyclic flotation.

[0018] c: Perform a third refining on the second refined concentrate in step b. During the third refining process, add 15-20 g / t glutathione inhibitor and 5-10 g / t methyl isobutyl methanol foaming agent, and refine for 4-6 minutes to obtain low-arsenic copper concentrate and third-refined tailings.

[0019] In this process, the tailings from the third fine-refining stage are returned to the second fine-refining stage for cyclic flotation.

[0020] Preferably, the specific process of the two scanning steps includes: X: The roughing tailings are subjected to the first scavenging. During the first scavenging process, 30~40g / t glutathione arsenic inhibitor, 20~30g / t Z200 collector, and 10~15g / t methyl isobutyl methanol frother are added. The scavenging is carried out for 3~5 minutes to obtain the first scavenging foam and the first scavenging tailings.

[0021] In this process, the first scavenging froth is returned to the first roughing process for cyclic flotation.

[0022] Y: The tailings obtained in the first scavenging step X are subjected to a second scavenging. During the second scavenging process, 20-30 g / t of glutathione inhibitor, 15-20 g / t of Z200 copper collector, and 5-10 g / t of methyl isobutyl methanol frother are added. The scavenging is carried out for 2-3 minutes to obtain the second scavenging foam and high-arsenic tailings.

[0023] In this process, the foam from the second scavenging is returned to the first scavenging process for cyclic flotation.

[0024] Preferably, before adjusting the slurry in step (1), the fine-grained high-arsenic copper concentrate is first subjected to a de-reagent treatment, which includes the following steps: S1: Water is added to fine-grained high-arsenic copper concentrate to prepare the slurry.

[0025] S2: Add resin to the slurry from step S1 and stir to adsorb it.

[0026] S3: The slurry stirred in step S2 is screened to complete the de-drug treatment and obtain de-drug fine-grained high-arsenic copper concentrate.

[0027] Because the flotation process of this invention has a highly effective and targeted inhibition effect on arsenopyrite in high-arsenic copper concentrate, it can reduce arsenic and improve the quality of difficult-to-flotate high-arsenic copper concentrate. Therefore, the flotation process of this invention is usually used in conjunction with other flotation processes for copper concentrate. After the other flotation processes for copper concentrate are completed, the flotation of this invention is carried out to reduce arsenic and improve the quality. However, other flotation processes may produce residual reagents, which may have a certain negative impact on the flotation of this invention. Therefore, in order to further improve the arsenic reduction and quality improvement effect of this invention, the fine-grained high-arsenic copper concentrate is first treated with de-reagent before the arsenic reduction flotation.

[0028] During the de-reagent treatment, the slurry needs to be prepared. After the final screening, only the resin is screened out, and the remaining slurry can be directly subjected to arsenic reduction flotation. Therefore, when de-reagenting fine-grained high-arsenic copper concentrate and then performing arsenic reduction flotation, it is only necessary to adjust the slurry of the copper concentrate before the de-reagent treatment. No further slurry adjustment is required for arsenic reduction flotation.

[0029] The sieved resin can be added back into the slurry for recycling or collected and used separately for other purposes, which helps control costs.

[0030] Preferably, in step S1, the mass of fine-grained high-arsenic copper concentrate accounts for 15% to 20% of the total mass of the slurry, and the mass of mineral particles with a diameter of -38 μm accounts for more than 90% of the total mass of the high-arsenic copper concentrate.

[0031] Preferably, in step S2, the resin is an anion exchange resin with a particle size of 0.5-0.7 mm, the resin is added at a mass of 3% to 5% of the mass of the fine-particle high-arsenic copper concentrate, and the stirring and adsorption time is 2 to 4 hours. In step S3, during the sieving process, the diameter of the sieve holes is smaller than the diameter of the resin particles.

[0032] The sieve aperture diameter is slightly smaller than the resin particle diameter (0.5-0.7 mm) to reduce the possibility of mineral particles being screened out.

[0033] In this invention, "g / t" refers to the amount of reagent added relative to the raw ore. For example, 100g / t of glutathione means that 100g of glutathione needs to be added to process 1 ton of raw ore.

[0034] The beneficial effects of this invention are: 1. This invention uses glutathione as an arsenopyrite inhibitor. It leverages the specific adsorption capacity of active thiol groups and other functional groups in the glutathione molecule for the surface of arsenopyrite, while exhibiting extremely weak adsorption on chalcopyrite. Glutathione is firmly adsorbed onto the surface of arsenopyrite, causing it to become strongly hydrophilic and thus inhibiting its adsorption. Simultaneously, it has virtually no impact on the floatability of chalcopyrite, thereby achieving relatively "precise" inhibition of arsenopyrite. This ensures excellent selective inhibition of arsenopyrite in fine-grained high-arsenic copper concentrate, achieving efficient arsenic reduction while maintaining a high copper recovery rate.

[0035] 2. Glutathione is widely found in animals and plants. It is a green biological inhibitor that avoids the environmental pollution problems that may be caused by traditional inorganic inhibitors or organic synthetic inhibitors. It can effectively improve the environmental friendliness of the flotation process and is conducive to achieving green and efficient arsenic reduction and quality improvement.

[0036] 3. This invention creatively introduces "resin de-treatment" as a pretreatment step. This step can efficiently and selectively adsorb and remove collectors and frothers remaining in high-arsenic copper concentrate due to other processes in the preceding stages, eliminating the "non-selective activation" or "masking" effect of these residual agents on arsenopyrite, purifying the mineral surface, and creating a pure and stable interfacial environment for the subsequent action of highly selective inhibitors, further enhancing the separation of chalcopyrite and arsenopyrite.

[0037] 4. This invention, through the dual protection of "resin desiccant removal" and "glutathione inhibition," can significantly reduce the arsenic content in flotation concentrate products. It effectively solves the problem that fine-grained toxic sands are easily mixed in the concentrate due to their huge specific surface area and good floatability. It can reduce the arsenic content of high-arsenic copper concentrate to below the qualified standard required for smelting, producing low-arsenic, high-quality copper concentrate products, which greatly enhances the economic value and environmental friendliness of the products.

[0038] 5. Due to the selective inhibition of arsenopyrite by glutathione and the elimination of interfering factors in the pretreatment process, chalcopyrite maintains excellent floatability throughout the entire separation process. This enables the present invention to achieve deep arsenic reduction while maximizing the copper recovery rate, avoiding the problem of large copper metal loss commonly seen in traditional strong oxidant or high-alkali processes, and maximizing resource utilization.

[0039] 6. This invention does not require flotation or pretreatment environments with strong acids or alkalis. The process conditions are mild, the operating environment is highly safe, the tailings wastewater treatment pressure is low, the process is simple, and the cost is controllable. It is suitable for industrial application and provides a clean, green, efficient, reliable and easy-to-implement industrial application solution to the long-standing problem of separating fine-grained high-arsenic copper ore in the mineral processing industry. It has broad market application prospects. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the process flow of the present invention. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the content described.

[0042] The control parameters of the flotation process in Embodiments 1-3 of the present invention are shown in Table 1.

[0043] Table 1 Example 1 This embodiment describes the arsenic reduction and upgrading treatment of No. 1 fine-grained high-arsenic copper concentrate. The copper grade of No. 1 high-arsenic copper concentrate is 24.56%, and the As content is 3.51%. (1) Place No. 1 high arsenic copper concentrate (mineral particles with a diameter of -38μm account for 98% of the total mass of high arsenic copper concentrate) in a mixing tank and add water to adjust the slurry until the mass of high arsenic copper concentrate accounts for 15% of the total mass of slurry.

[0044] (2) Add anion exchange resin with a particle size of 0.5-0.7 mm to the slurry at 3% of the mass of high arsenic copper concentrate and stir for adsorption for 4 hours.

[0045] (3) The resin-containing slurry is screened and the resin is removed by vibrating screen. The screen size of the vibrating screen is 80% of the diameter of the resin particles to obtain the de-resined high arsenic copper concentrate slurry.

[0046] (4) such as Figure 1As shown, the high-arsenic copper concentrate slurry after reagent removal is adjusted to pH=5 with sulfuric acid for the first roughing process, yielding the first roughing concentrate and the first roughing tailings. Then, the first roughing tailings are subjected to a second roughing process, yielding the second roughing concentrate and the roughing tailings. The roughing tailings are then subjected to two scavenging processes to obtain high-arsenic tailings. The foam from the first scavenging process is returned for the first roughing process, and the foam from the second scavenging process is returned for the first scavenging process. The first and second roughing concentrates are combined and then subjected to three cleaning processes to obtain low-arsenic copper concentrate. The tailings from the first cleaning process are returned for the first roughing process, the tailings from the second cleaning process are returned for the first cleaning process, and the tailings from the third cleaning process are returned for the second cleaning process, thus forming a closed-loop flotation process.

[0047] The results of arsenic reduction and quality improvement in Example 1 are shown in Table 2.

[0048] Example 2 This embodiment describes an arsenic-reducing and quality-upgrading treatment of No. 2 high-arsenic copper concentrate. The copper grade of No. 2 high-arsenic copper concentrate is 23.87%, and the As content is 4.08%. (1) Place No. 2 high arsenic copper concentrate (mineral particles with a diameter of -38μm account for 95% of the total mass of high arsenic copper concentrate) in a mixing tank and add water to adjust the slurry until the mass of high arsenic copper concentrate accounts for 18% of the total mass of slurry.

[0049] (2) Add anion exchange resin with a particle size of 0.5-0.7 mm to the slurry at 4% of the mass of high arsenic copper concentrate and stir for adsorption for 3 hours.

[0050] (3) The resin-containing slurry is screened and the resin is removed by a vibrating screen with a certain screen size. The screen size of the vibrating screen is 80% of the diameter of the resin particles, and the high arsenic copper concentrate slurry after descaling is obtained.

[0051] (4) such as Figure 1 As shown, the high-arsenic copper concentrate slurry after reagent removal is adjusted to pH=5.5 with sulfuric acid for the first roughing process, yielding the first roughing concentrate and the first roughing tailings. The first roughing tailings are then subjected to a second roughing process, yielding the second roughing concentrate and the roughing tailings. The roughing tailings are then subjected to two scavenging processes to obtain high-arsenic tailings. The foam from the first scavenging process is returned for the first roughing process, and the foam from the second scavenging process is returned for the first scavenging process. The first and second roughing concentrates are combined and then subjected to three cleaning processes to obtain low-arsenic copper concentrate. The tailings from the first cleaning process are returned for the first roughing process, the tailings from the second cleaning process are returned for the first cleaning process, and the tailings from the third cleaning process are returned for the second cleaning process, thus forming a closed-loop flotation process.

[0052] The results of arsenic reduction and quality improvement in Example 2 are shown in Table 2.

[0053] Example 3 This embodiment describes an arsenic reduction and upgrading treatment of No. 3 high-arsenic copper concentrate. The fineness of No. 3 high-arsenic copper concentrate is -38µm (90%), copper grade is 22.60%, and As content is 5.22%. (1) Place No. 3 high arsenic copper concentrate (mineral particles with a diameter of -38μm account for 90% of the total mass of high arsenic copper concentrate) in a mixing tank and add water to adjust the slurry until the mass of high arsenic copper concentrate accounts for 20% of the total mass of slurry.

[0054] (2) Add anion exchange resin with a particle size of 0.5-0.7 mm to the slurry at 5% of the mass of high arsenic copper concentrate and stir for 2 hours for adsorption.

[0055] (3) The resin-containing slurry is screened and the resin is removed by a vibrating screen with a certain screen size. The screen size of the vibrating screen is 80% of the diameter of the resin particles, and the high arsenic copper concentrate slurry after descaling is obtained.

[0056] (4) such as Figure 1 As shown, the high-arsenic copper concentrate slurry after reagent removal is adjusted to pH=6 with sulfuric acid for the first roughing process, yielding the first roughing concentrate and the first roughing tailings. Then, the first roughing tailings are subjected to a second roughing process, yielding the second roughing concentrate and the roughing tailings. The roughing tailings are then subjected to two scavenging processes to obtain high-arsenic tailings. The foam from the first scavenging process is returned for the first roughing process, and the foam from the second scavenging process is returned for the first scavenging process. The first and second roughing concentrates are combined and then subjected to three cleaning processes to obtain low-arsenic copper concentrate. The tailings from the first cleaning process are returned for the first roughing process, the tailings from the second cleaning process are returned for the first cleaning process, and the tailings from the third cleaning process are returned for the second cleaning process, forming a closed-loop flotation process.

[0057] The results of arsenic reduction and quality improvement in Example 3 are shown in Table 2.

[0058] Comparative Example This comparative example uses the same method as Example 2 to reduce arsenic and improve the quality of the same fine-grained high-arsenic copper concentrate. The difference is that potassium permanganate is used as an arsenopyrite inhibitor in this comparative example.

[0059] The flotation results of the copper concentrate and tailings in this comparative example are shown in Table 2.

[0060] Table 2 As shown in Table 2, compared with the comparative examples, the copper grade of the low-arsenic copper concentrate obtained in the embodiments of the present invention can reach over 27%, the copper recovery rate can reach over 96%, and the content of harmful impurities (As) in the copper concentrate can be reduced to below 0.45%, all of which meet the relevant standards and specifications for copper concentrate. This demonstrates that the present invention can effectively achieve the efficient separation of chalcopyrite and arsenopyrite in high-arsenic copper concentrate, thereby achieving efficient arsenic removal, significantly improving the quality of copper concentrate while ensuring a high copper recovery rate, fundamentally solving the problem of arsenic reduction and quality improvement in high-arsenic copper concentrate.

[0061] In summary, by using glutathione as an inhibitor and combining the synergistic effect of the desiccant treatment and flotation processes, this invention significantly improves the separation of chalcopyrite and arsenopyrite, effectively solving the problem of copper-arsenic separation. This greatly improves the quality of copper concentrate products while increasing copper recovery rate, fully achieving the goal of reducing arsenic and improving the quality of high-arsenic copper concentrate.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for reducing arsenic and upgrading a fine high-arsenic copper concentrate, characterized in that: The method comprises the following steps: (1) adding water to the fine particle high-arsenic copper concentrate to perform slurry preparation, to obtain a slurry; (2) adjusting the pH of the slurry obtained in the step (1); (3) using glutathione as an inhibitor, performing flotation on the slurry, to complete the arsenic reduction and quality improvement of the fine particle high-arsenic copper concentrate.

2. The method of claim 1, wherein: In the step (1), the mass of the fine particle high-arsenic copper concentrate accounts for 15%-20% of the total mass of the slurry, and the mass of the mineral particles with a particle size of-38 μm in the fine particle high-arsenic copper concentrate accounts for more than 90% of the total mass of the high-arsenic copper concentrate.

3. The method of claim 1, wherein: In the step (2), the pH of the slurry is adjusted to 5-6.

4. The method of claim 1, wherein: In the step (3), the flotation comprises firstly performing twice rough selection on the slurry to obtain a rough selection concentrate and a rough selection tailing, then performing thrice selection on the rough selection concentrate in sequence to obtain a low-arsenic copper concentrate, and performing twice scavenging on the rough selection tailing in sequence to obtain a high-arsenic tailing.

5. The method of claim 4, wherein: The specific process of the twice rough selection comprises: A: firstly performing first rough selection on the slurry, in the first rough selection process, adding 100-150 g / t glutathione arsenic inhibitor, 80-100 g / t Z200 collector and 30-40 g / t methyl isobutyl carbinol frother, and rough selecting for 5-7 min to obtain first rough selection concentrate and first rough selection tailing; B: performing second rough selection on the first rough selection tailing obtained in the step A, in the second rough selection process, adding 50-75 g / t glutathione arsenic inhibitor, 40-50 g / t Z200 collector and 15-20 g / t methyl isobutyl carbinol frother, and rough selecting for 4-6 min to obtain second rough selection concentrate and rough selection tailing; The first rough selection concentrate and the second rough selection concentrate are combined to obtain the rough selection concentrate.

6. The method of claim 4, wherein: The specific process of the thrice selection comprises: a: performing first selection on the rough selection concentrate, in the first selection process, adding 50-60 g / t glutathione inhibitor and 10-20 g / t methyl isobutyl carbinol frother, and selecting for 6-8 min to obtain first selection concentrate and first selection tailing; b: performing second selection on the first selection concentrate obtained in the step a, in the second selection process, adding 30-50 g / t glutathione inhibitor and 10-15 g / t methyl isobutyl carbinol frother, and selecting for 5-7 min to obtain second selection concentrate and second selection tailing; c: performing third selection on the second selection concentrate in the step b, in the third selection process, adding 15-20 g / t glutathione inhibitor and 5-10 g / t methyl isobutyl carbinol frother, and selecting for 4-6 min to obtain low-arsenic copper concentrate and third selection tailing.

7. The method of claim 4, wherein: The specific process of the twice scavenging comprises: X: performing first scavenging on the rough selection tailing, in the first scavenging process, adding 30-40 g / t glutathione arsenic inhibitor, 20-30 g / t Z200 collector and 10-15 g / t methyl isobutyl carbinol frother, and scavenging for 3-5 min to obtain first scavenging froth and first scavenging tailing; Y: performing second cleaning on the first cleaning tailings obtained in the step X, in the second cleaning process, adding 20-30 g / t glutathione inhibitor, 15-20 g / t Z200 copper collector, 5-10 g / t methyl isobutyl carbinol frother, cleaning for 2-3 min, obtaining second cleaning froth and high-arsenic tailings.

8. The method of claim 1, wherein: Before the step (1), the micro-fine high-arsenic copper concentrate is preferably subjected to a reagent removal treatment, and the reagent removal treatment comprises the following steps: S1: adding water to the micro-fine high-arsenic copper concentrate to obtain a slurry; S2: adding resin to the slurry of the step S1 and stirring and adsorbing; S3: screening the slurry after stirring in the step S2 to complete the reagent removal treatment and obtain reagent-removed micro-fine high-arsenic copper concentrate.

9. The method of claim 8, wherein: In the step S1, the mass of the micro-fine high-arsenic copper concentrate accounts for 15%-20% of the total mass of the slurry, and the mass of the mineral particles with a particle size of-38 μm in the micro-fine high-arsenic copper concentrate accounts for more than 90% of the total mass of the high-arsenic copper concentrate.

10. The method of claim 8, wherein: In the step S2, the resin is an anion resin with a particle size of 0.5-0.7 mm, the mass of the resin added is 3%-5% of the mass of the micro-fine high-arsenic copper concentrate, and the stirring and adsorption time is 2-4 h; In the step S3, in the screening process, the screen hole diameter is less than the particle diameter of the resin.

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