Method for flotation separation of chalcopyrite and arsenopyrite by using oxidizing agent and complexing agent

Abstract

The invention belongs to the technical field of mineral processing, discloses a method for flotation separation of chalcopyrite and arsenopyrite by using an oxidizing agent and a complexing agent, and provides a method for flotation separation of chalcopyrite and arsenopyrite by using the oxidizing agent (chlorine dioxide, hydrogen peroxide, ozone and the like) and the complexing agent (ammonium carbamate). An oxidizing agent is added into a flotation pulp system, the arsenopyrite can be inhibited after being oxidized, the recovery rate of the arsenopyrite is controlled to be inhibited to be 10% or below, meanwhile, part of the chalcopyrite is inhibited, then a complexing agent ammonium carbamate is added, copper on the surface of the chalcopyrite can react with anions and cations ionized by the ammonium carbamate, and the concentration of the copper on the surface of the chalcopyrite is reduced. And double complexing is performed to form stable adsorption, so that more active sites exist on the surface of the mineral, the chalcopyrite is further activated, and more effective separation of the chalcopyrite and the arsenopyrite is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for flotation separation of chalcopyrite and arsenopyrite by utilizing an oxidant and a complexing agent. Background Art

[0002] Copper is a non-ferrous metal that has a very close relationship with human beings. It is not only abundant in nature but also has excellent electrical conductivity, thermal conductivity, ductility, corrosion resistance, wear resistance and other excellent properties. It is widely used in electricity, electronics, energy and petrochemicals, machinery and metallurgy, transportation, light industry, emerging industries and other fields. It is second only to aluminum in the consumption of non-ferrous metal materials in my country.

[0003] Most of my country's copper mines exist in the form of sulfide ores, and a small part exists in the form of oxide ores and native copper. Chalcopyrite (CuFeS2) is an important and abundant copper-containing mineral, accounting for 70% of the earth's copper resources. However, in ores, sulfide minerals are always intertwined with other sulfide and non-sulfide minerals.

[0004] Arsenic not only causes harm to the human body but also pollutes the environment. With large-scale arsenic pollution caused by natural and man-made reasons, it has become a global environmental problem.

[0005] Arsenopyrite is a common arsenic-containing mineral that often occurs with chalcopyrite in polymetallic sulfide deposits. The ore has a small distribution particle size and a complex symbiotic relationship. Both arsenopyrite and chalcopyrite have similar surface characteristics, which unfortunately makes their flotation properties similar. In addition, the inevitable presence of certain ions in the slurry (such as copper ions) will activate the flotation of arsenopyrite, which complicates the separation of arsenopyrite and chalcopyrite in particular. Arsenopyrite incorporated into copper concentrate not only affects the quality of the concentrate and reduces its economic value, but also complicates the downstream pyrometallurgical process performed on it. In addition, once arsenic is released into the environment, it will show a pollution effect and cause great harm to human health. Therefore, the effective separation of chalcopyrite and arsenopyrite is imperative.

[0006] In view of the problem that chalcopyrite and arsenopyrite have excellent natural floatability and can be separated by selective flotation, the first object of the present invention is to provide a method for selective flotation separation of chalcopyrite and arsenopyrite, aiming to utilize an inhibitor to better inhibit the arsenopyrite, and then activate the chalcopyrite, thereby realizing a more effective separation method of chalcopyrite and arsenopyrite.

[0007] Through the above analysis, the problems and defects of the prior art are as follows:

[0008] (1) Arsenopyrite is a common arsenic-containing mineral that often occurs with chalcopyrite in polymetallic sulfide deposits. The ore has a small distribution particle size and a complex paragenesis relationship. Both arsenopyrite and chalcopyrite have similar surface characteristics, which unfortunately makes their flotation properties similar.

[0009] (2) The inevitable presence of certain ions (such as copper ions) in the slurry will activate the flotation of arsenopyrite, which particularly complicates the separation of arsenopyrite and chalcopyrite. The inclusion of arsenopyrite in copper concentrate not only affects the quality of the concentrate and reduces its economic value, but also complicates the downstream pyrometallurgical process. Summary of the invention

[0010] In view of the problems existing in the prior art, the present invention provides a method for flotation separation of chalcopyrite and arsenopyrite by utilizing an oxidant and a complexing agent.

[0011] The present invention is achieved in that a method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent comprises:

[0012] S1, grinding the chalcopyrite and arsenopyrite ores to be processed, and preparing a slurry in a ratio of chalcopyrite to arsenopyrite of 4:1;

[0013] S2, adding an oxidant to the slurry obtained in S1 to adjust the slurry;

[0014] S3, adding ammonium carbamate as an activator to the slurry obtained in S2 to adjust the slurry;

[0015] S4, flotation is performed on the ore pulp obtained in S3 according to a conventional process to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0016] Furthermore, the slurry in S1 is prepared by adding water to prepare a slurry with a mass concentration of 4%.

[0017] Furthermore, the slurry preparation time in S1 is 1 min.

[0018] Furthermore, the chalcopyrite and arsenopyrite grinding in S1 is to grind the raw ore to a particle size of -74 μm accounting for 85% of the total, or grind the mixed ore sample to a particle size of -200 to 325 mesh.

[0019] Furthermore, the oxidant in S2 is ClO2, H2O2 or O3, and the addition amount is 8.0×10 -4 mol / L;

[0020] The slurry preparation time in S2 is 3 minutes.

[0021] Furthermore, the activator in S3 is ammonium carbamate, and the addition amount is 5.0×10 -4 mol / L.

[0022] Another object of the present invention is to provide a system for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent, comprising:

[0023] A preparation module is used to prepare slurry in a ratio of 4:1 of chalcopyrite and arsenopyrite after grinding the raw chalcopyrite and arsenopyrite ores to be processed;

[0024] A slurry adjustment module is used to add an oxidant to the obtained slurry to adjust the slurry;

[0025] A mixing module is used to add an activator, ammonium carbamate, to the obtained ore pulp to adjust the pulp;

[0026] The flotation module is used to flot the obtained ore pulp according to conventional processes to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0027] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0028] First, the present invention relates to a method for flotation separation of chalcopyrite and arsenopyrite using an oxidant (chlorine dioxide, hydrogen peroxide, ozone, etc.) and a complexing agent (ammonium carbamate).

[0029] When ammonium carbamate dissolves in water, it will generate NH4HCO3 and NH3·H2O. The Cu on the surface of chalcopyrite will ionize with NH4HCO3 and NH3·H2O to generate NH4 + The reaction generates a copper-ammonium complex, thus increasing the activity of the surface copper atoms. Copper is more easily adsorbed on the surface of chalcopyrite, thus achieving the purpose of activating chalcopyrite.

[0030] The principle of the present invention is as follows: a method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent, wherein an oxidant is added to the flotation pulp system, and the oxidation of arsenopyrite is suppressed, and the recovery rate of arsenopyrite is controlled to be suppressed to below 10%, and part of the chalcopyrite is also suppressed, and then ammonium carbamate is added, and the anions and cations ionized by the ammonium carbamate are double-complexed with the copper on the surface of the chalcopyrite mineral to form a stable adsorption, and can form a double complex with the copper ions in the pulp solution, so that the mineral surface has more active sites. Since the copper activity on the surface of the chalcopyrite mineral is improved, copper is more likely to undergo a replacement reaction, so that the hydrophobicity of the chalcopyrite surface can be enhanced, creating better conditions for the flotation separation of chalcopyrite and arsenopyrite.

[0031] Second, the process of the present invention has high recovery index, simple flow, easy operation, low production cost, environmental protection and energy saving.

[0032] (1) The expected benefits and commercial value of the technical solution of the present invention after transformation are as follows: after transformation, the technical solution can improve the recovery efficiency of copper resources, improve production indicators, and greatly reduce the arsenic content in minerals, which can bring more economic benefits to the enterprise.

[0033] (2) The technical solution of the present invention fills the technical gap in the industry at home and abroad: currently in industrial production, there is no use of organic ammonium as an activator or complexing agent after oxidation to promote the separation of chalcopyrite and arsenopyrite.

[0034] Third, the technical solution of the present invention solves the technical problems of the prior art and represents a significant technological advancement in industrial applications.

[0035] 1. Existing technical problems solved

[0036] In traditional mineral flotation separation, the separation of chalcopyrite (CuFeS2) and arsenopyrite (As2S3) faces the following technical challenges:

[0037] 1. Poor separation selectivity: The physical properties and surface chemical characteristics of chalcopyrite and arsenopyrite in the slurry are relatively similar, which makes it difficult to achieve efficient separation in traditional flotation processes, ultimately affecting the concentrate purity and product quality.

[0038] 2. Inefficiency of flotation reagents: The reagents used in traditional flotation processes are often unable to specifically inhibit or activate specific minerals, causing the flotation process to have a greater impact on the environment. In addition, the amount of reagents used is large, the cost is high, and production efficiency is reduced.

[0039] 3. Environmental pollution problem: Arsenic and other harmful elements are contained in arsenopyrite. Traditional flotation methods are often unable to effectively separate arsenic minerals, causing arsenic to enter the concentrate, creating potential environmental pollution risks and increasing the difficulty of subsequent treatment.

[0040] 4. Poor process stability: Traditional flotation methods rely on complex reagent formulations and multi-step processes, which make it difficult to stably control flotation conditions, resulting in large fluctuations in separation effects and are not suitable for large-scale production.

[0041] 2. Technical solution of the present invention

[0042] In view of the above technical problems, the present invention proposes a flotation separation technology through the synergistic effect of an oxidant and an activator, which significantly improves the separation effect of chalcopyrite and arsenopyrite. The method includes the following key steps:

[0043] 1. Selective inhibition of oxidants: By adding specific oxidants (such as ClO2, H2O2 or O3) to the pulp, the surface activity of chalcopyrite is effectively inhibited, making it difficult to adsorb flotation agents, so that it mainly remains in the pulp during the flotation process.

[0044] 2. Targeted activation of the activator: Add the activator ammonium carbamate to selectively activate the surface of arsenopyrite particles, enhance the adsorption capacity of arsenopyrite to flotation agents, float arsenopyrite preferentially, and achieve efficient separation from chalcopyrite.

[0045] 3. Environmentally friendly reagent formula: The oxidant and activator used in the present invention are environmentally friendly reagents, which reduce the pollution risk in the flotation process, avoid the arsenic pollution problem in the traditional process, and improve the environmental performance of the process.

[0046] 4. Process simplification and stabilization: Through optimized reagent concentration and control steps, the process is stable and easy to operate, which not only improves the separation efficiency but also is suitable for large-scale industrial applications.

[0047] 3. Significant Technological Advances

[0048] On the basis of solving the problems of the prior art, the present invention has achieved the following significant technical progress:

[0049] 1. The separation efficiency is significantly improved: The combined use of oxidants and activators greatly improves the separation selectivity of chalcopyrite and arsenopyrite, and can obtain high-purity chalcopyrite concentrate and reduce the residual amount of arsenopyrite.

[0050] 2. Reduce the amount of reagents used and the cost: Due to the selective effects of the oxidant and the activator, the present invention reduces the amount of flotation reagents used, significantly reduces the production cost, and improves the economy.

[0051] 3. Improved environmental performance: Through the selection of environmentally friendly agents and the effective separation of arsenic minerals, the present invention reduces the common environmental pollution problems in traditional flotation processes, especially the risk of arsenic pollution to water and soil, and meets the green development needs of modern industry.

[0052] 4. Process stability and ease of operation: The process design of the present invention is simple and easy to operate, which reduces the complex flotation reagent combination and adjustment steps, ensures the stability and efficiency of flotation separation, and is suitable for large-scale industrial promotion.

[0053] 5. Wide applicability: This process is applicable to chalcopyrite and arsenopyrite ores of various grades and compositions, and has good adaptability, which expands its application scope in the non-ferrous metal beneficiation industry.

[0054] The present invention realizes the efficient separation of chalcopyrite and arsenopyrite in the flotation process through the innovative combination of oxidant and activator, and solves the problems of poor separation selectivity, environmentally unfriendly reagent use and high cost in traditional flotation methods. This technical solution not only improves separation efficiency and product purity, but also reduces reagent costs and environmental risks. It has significant industrial application value and promotion potential, and provides new ideas and technical support for the development of green mineral processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 The present invention provides a method flow chart for flotation separation of chalcopyrite and arsenopyrite by using an oxidant and a complexing agent.

[0056] Figure 2 It is a detailed flow chart of a method for flotation separation of chalcopyrite and arsenopyrite using an oxidant (ClO2, H2O2, O3) and an activator (ammonium carbamate) provided in an embodiment of the present invention.

[0057] Figure 3 The present invention provides a system structure block diagram for flotation separation of chalcopyrite and arsenopyrite by using an oxidant and a complexing agent. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0059] like Figure 1 As shown, a method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent provided in an embodiment of the present invention comprises the following steps:

[0060] like Figure 1 , 2 As shown, the method for flotation separation of chalcopyrite and arsenopyrite using an oxidant (ClO2, H2O2, O3) and an activator (ammonium carbamate) provided in an embodiment of the present invention comprises the following steps:

[0061] S1, grinding the chalcopyrite and arsenopyrite ores to be processed, and preparing a slurry in a ratio of chalcopyrite to arsenopyrite of 4:1;

[0062] S2, adding an oxidant to the slurry obtained in S1 to adjust the slurry;

[0063] S3, adding ammonium carbamate as an activator to the slurry obtained in S2 to adjust the slurry;

[0064] S4, flotation is performed on the ore pulp obtained in S3 according to a conventional process to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0065] Arsenopyrite and chalcopyrite both have similar surface characteristics, which unfortunately makes their flotation properties similar. In order to solve the problem that arsenopyrite and chalcopyrite have similar surface characteristics and similar flotation properties, resulting in poor flotation separation effects, the present invention provides a method for flotation separation of chalcopyrite and arsenopyrite using an oxidant (ClO2, H2O2, O3) and an activator (ammonium carbamate).

[0066] To better achieve the above purpose, the method for flotation separation of chalcopyrite and arsenopyrite using an oxidant (ClO2, H2O2, O3) and an activator (ammonium carbamate) provided in an embodiment of the present invention comprises the following steps:

[0067] 1) The chalcopyrite ore and arsenopyrite ore to be treated or the ore after grinding are prepared in a ratio of chalcopyrite to arsenopyrite of 4:1, and water is added to prepare a slurry with a mass concentration of 20%, and then the slurry is adjusted for 2 minutes;

[0068] 2) adding an oxidant to the slurry obtained in step 1) and mixing the slurry for 3 minutes;

[0069] 3) Adding activator ammonium carbamate to the slurry obtained in step 2) and mixing the slurry for 3 minutes,

[0070] 4) flotation the slurry obtained in step 3) according to conventional technology to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0071] The grinding described in step 1) is to grind the chalcopyrite ore and arsenopyrite ore to a particle size of -74 μm accounting for about 85% of the total, or to grind the ore sample to a particle size of -200 to 325 mesh.

[0072] In step 2), the oxidant is ClO2, H2O2 or O3, and the amount added is 8.0×10 -4 mol / L.

[0073] The activator in step 3) is ammonium carbamate, and the amount added is 5.0×10 -4 mol / L

[0074] When an oxidant is added to the flotation pulp system, the oxidation of arsenopyrite will be suppressed, and the recovery rate of arsenopyrite will be controlled to be below 10%. At the same time, part of the chalcopyrite will also be suppressed. After that, ammonium carbamate is added, and the copper on the surface of the chalcopyrite mineral will react with the anions and cations ionized by the ammonium carbamate to form a double complex to form a stable adsorption, so that there are more active sites on the mineral surface, thereby activating the chalcopyrite, thereby achieving a more effective separation of chalcopyrite and arsenopyrite.

[0075] like Figure 3 As shown, a system for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent provided in an embodiment of the present invention comprises:

[0076] A preparation module is used to prepare slurry in a ratio of 4:1 of chalcopyrite and arsenopyrite after grinding the raw chalcopyrite and arsenopyrite ores to be processed;

[0077] A slurry adjustment module is used to add an oxidant to the obtained slurry to adjust the slurry;

[0078] A mixing module is used to add an activator, ammonium carbamate, to the obtained ore pulp to adjust the pulp;

[0079] The flotation module is used to flot the obtained ore pulp according to conventional processes to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0080] In the embodiments of the present invention, ores at different stages of copper mines are used for experiments, and the main ore component of the copper mine is arsenic sulfate copper ore.

[0081] The implementation process of the present invention is described as follows:

[0082] As attached Figure 1 As shown, 500g of the raw ore of the present invention is added to a ball mill, and clean water is added for grinding until the grinding fineness is -0.074mm accounting for 65%, and the grinding concentration is 60%; the ground slurry is added to a 3L flotation tank, calculated by the dry weight of the raw ore per ton, stirred for 5 minutes, and an oxidant (ClO2, H2O2 or O3) a'1600g / t, ammonium carbamate b'1000g / t, butyl xanthate c'10g / t, No. 2 oil d'5g / t are added in sequence, and the first copper roughing I is carried out after stirring and slurrying for 10 minutes to obtain a separated flotation concentrate product and tailings, and the concentrate product copper roughing foam is subjected to a blank concentration to obtain a low-arsenic copper concentrate 1 and a selected tailings;

[0083] The tailings of rougher selection I and the selected tailings are mixed, butyl xanthate c'10g / t, No. 2 oil d'5g / t are added, and the first scavenging selection I is carried out after stirring and slurrying for 10 minutes to obtain scavenging concentrate and tailings. The scavenging concentrate and the selected products of rougher selection II are combined and then subjected to two copper concentration operations to obtain low-arsenic copper concentrate 2. The tailings of the copper concentration operation are returned to the previous flotation operation in sequence;

[0084] The tailings of scavenging Ⅰ are added with butyl xanthate c'10g / t and No. 2 oil d'5g / t in sequence, stirred and slurried for 10 minutes, and then the second scavenging Ⅱ is carried out to obtain scavenging concentrate and tailings. The obtained scavenging Ⅱ concentrate is returned to the roughing Ⅱ flotation operation;

[0085] The tailings obtained from scavenging II are added with butyl xanthate c'10g / t and No. 2 oil d'5g / t in sequence, and after stirring and slurrying for 10 minutes, the third scavenging III is carried out to obtain scavenging concentrate and tailings. The scavenging III tailings are output as the final tailings product, and the concentrate is returned to the previous flotation operation.

[0086] The following examples are completed according to the above process: Example 1 The copper content of the raw ore used in this example is 0.57%, and the arsenic content is 0.035%. The inhibitor and activator used are both analytically pure.

[0087] The test results obtained after the above embodiment is processed according to the implementation process are as follows Table 1:

[0088]

[0089] The following examples are completed according to the above process: Example 1 The copper content of the raw ore used in this example is 0.93%, and the arsenic content is 0.041%. The inhibitor and activator used are both analytically pure.

[0090] The test results obtained after the above embodiment is processed according to the implementation process are as follows Table 2:

[0091]

[0092]

[0093] By adding the method of the present invention to separate copper and arsenic, the copper recovery rate is high, and the purpose of good copper and arsenic separation is achieved.

[0094] The present invention provides a method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent, wherein the chalcopyrite and arsenopyrite raw ores to be treated are first subjected to grinding treatment. The purpose of grinding is to refine the ore particles to a sufficient particle size so that the subsequent flotation process is more efficient. Specifically, the raw ore is ground to a particle size of -74 μm, accounting for 85% of the total, or the mixed ore sample is ground to a fineness of 200 to 325 meshes, thereby increasing the exposure area and reactivity of the minerals. Afterwards, the ore is mixed into a mixed ore sample in a ratio of 4:1 between chalcopyrite and arsenopyrite, and water is added to form a slurry with a mass concentration of 4% to ensure appropriate fluidity and uniform distribution of the slurry.

[0095] After the slurry is prepared, an oxidant is added to the slurry. This step is one of the keys to separate chalcopyrite and arsenopyrite. The oxidant can be chlorine dioxide (ClO2), hydrogen peroxide (H2O2) or ozone (O3), and the addition amount is 8.0×10 -4 mol / L. The role of the oxidant is to change the charge characteristics and surface chemical properties of chalcopyrite and arsenopyrite, inhibit the surface activity of chalcopyrite, and make it difficult to adsorb flotation reagents. After the addition of the oxidant, the slurry is adjusted for 3 minutes to make the oxidant evenly distributed in the slurry and fully react with the surface of the mineral particles to ensure that the selective effect of the subsequent activator is better.

[0096] After oxidation treatment, the slurry was added with activator ammonium carbamate (NH2COONH4) in an amount of 5.0×10 - 4 mol / L. The role of the activator is to selectively activate the surface of arsenopyrite particles and enhance its affinity for flotation reagents, while having little effect on the surface of chalcopyrite. This selective activation allows arsenopyrite to float out preferentially during the flotation process, thereby achieving separation from chalcopyrite. The use of ammonium carbamate is based on its unique complexation effect. By adjusting the chemical properties of the arsenopyrite surface, it increases the adsorption of flotation reagents on the arsenopyrite surface, thereby enhancing the flotation separation effect.

[0097] After adding the activator and adjusting the pulp, the various components of the pulp are evenly distributed and the flotation separation is ready. The adjusted pulp is sent to the flotation tank for conventional flotation operations. During the flotation process, arsenopyrite is preferentially combined with the frothing agent and taken out due to its surface activation, while chalcopyrite is less combined with the flotation agent due to the inhibition of the oxidant, so it remains in the pulp. This flotation process based on surface chemical differences can effectively separate chalcopyrite and arsenopyrite.

[0098] In the flotation process, various reagents play an indispensable role. Oxidants play a key role in inhibiting the surface activity of chalcopyrite, while activators enhance the flotation selectivity of arsenopyrite. In the flotation process, the selection and dosage of reagents have a direct impact on the final separation efficiency. In this process, the dosage of oxidants and activators is precisely controlled to ensure the selective effect of reagent concentration on the mineral surface, thereby improving the flotation separation effect and product purity.

[0099] The flotation separation process of the present invention has significant advantages in industrial applications. First, by using an oxidant and an activator in combination, efficient separation of chalcopyrite and arsenopyrite is achieved, the operation is simple, and the effect is stable. Secondly, the process avoids excessive use of harmful agents and reduces the negative impact on the environment. Since the reaction conditions of the process are relatively mild, the concentrations of the oxidant and the activator are moderate, the flotation agent has a smaller burden on the environment, and the process is more environmentally friendly. In addition, the conditions of the entire process are suitable for conventional ore processing environments and are suitable for large-scale industrial promotion and application.

[0100] The present invention precisely controls the separation behavior of chalcopyrite and arsenopyrite in flotation through the inhibitory effect of the oxidant and the selective activation of the activator. The mutual cooperation of the oxidant and the activator realizes the optimization of the surface characteristics of the mineral, so that arsenopyrite floats out first and the chalcopyrite remains in the ore pulp, achieving an excellent separation effect. This efficient separation process not only improves the purity and quality of the flotation concentrate, but is also environmentally friendly and feasible, and has significant industrial application value.

[0101] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent, characterized in that: The following steps are involved: S1, grinding the chalcopyrite and arsenopyrite ores to be processed, and preparing a slurry in a ratio of chalcopyrite to arsenopyrite of 4:1; S2, adding an oxidant to the slurry obtained in S1 to adjust the slurry; S3, adding ammonium carbamate as an activator to the slurry obtained in S2 to adjust the slurry; S4, flotation is performed on the ore pulp obtained in S3 according to a conventional process to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

2. The method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent as claimed in claim 1, characterized in that: The ore slurry in S1 is prepared by adding water to prepare the ore slurry with a mass concentration of 4%.

3. The method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent as claimed in claim 1, characterized in that: The slurry preparation time in S1 is 1 min.

4. The method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent as claimed in claim 1, characterized in that: The chalcopyrite and arsenopyrite grinding in S1 is to grind the raw ore to a particle size of -74 μm accounting for 85% of the total, or grind the mixed ore sample to a particle size of -200 to 325 mesh.

5. The method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent as claimed in claim 1, characterized in that: The oxidant in S2 is ClO2, H2O2 or O3, and the added amount is 8.0×10 -4 mol / L; The slurry preparation time in S2 is 3 minutes.

6. The method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent as claimed in claim 1, characterized in that: The activator in S3 is ammonium carbamate, and the addition amount is 5.0×10 -4 mol / L.

7. A system for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent, which implements the method for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent as claimed in any one of claims 1 to 6, characterized in that: The system for flotation separation of chalcopyrite and arsenopyrite using an oxidant and a complexing agent comprises: A preparation module is used to prepare slurry in a ratio of 4:1 of chalcopyrite and arsenopyrite after grinding the raw chalcopyrite and arsenopyrite ores to be processed; A slurry adjustment module is used to add an oxidant to the obtained slurry to adjust the slurry; A mixing module is used to add an activator, ammonium carbamate, to the obtained ore pulp to adjust the pulp; The flotation module is used to flot the obtained ore pulp according to conventional processes to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

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