A method for separating chalcopyrite and arsenopyrite by flotation using oxidizing agents and complexing agents.

Abstract

This invention belongs to the field of mineral processing technology and discloses a method for separating chalcopyrite and arsenopyrite by flotation using an oxidant and a complexing agent. The method involves adding an oxidant (chlorine dioxide, hydrogen peroxide, ozone, etc.) and a complexing agent (ammonium carbamate) to the flotation slurry system. The arsenopyrite is oxidized and then suppressed, with the recovery rate controlled to below 10%. Simultaneously, some chalcopyrite is also suppressed. Then, the complexing agent ammonium carbamate is added. The copper on the surface of the chalcopyrite reacts with the ionized anions and cations of ammonium carbamate, forming a stable adsorption through double complexation. This increases the number of active sites on the mineral surface, thereby activating the chalcopyrite and achieving more effective separation of chalcopyrite and arsenopyrite.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology, and in particular relates to a method for separating chalcopyrite and arsenopyrite by flotation using oxidizing agents and complexing agents. Background Technology

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

[0003] The vast majority of copper deposits in my country exist as sulfide ores, with a smaller portion existing as oxide ores and native copper. Chalcopyrite (CuFeS2) is an important and abundant copper-bearing 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 harms the human body but also pollutes the environment. With widespread arsenic pollution caused by both natural and human factors, it has become a global environmental problem.

[0005] Arsene is a common arsenic-bearing mineral, frequently occurring alongside chalcopyrite in polymetallic sulfide deposits. The ore distribution is characterized by small grain size and complex co-occurrence relationships. Both arsenopyrite and chalcopyrite possess similar surface properties, which unfortunately leads to similar flotation characteristics. Furthermore, the unavoidable presence of certain ions in the slurry (such as copper ions) activates arsenopyrite flotation, further complicating the separation of arsenopyrite and chalcopyrite. The inclusion of arsenopyrite in copper concentrate not only affects concentrate quality and reduces its economic value but also complicates downstream pyrometallurgical processes. Moreover, once arsenic is released into the environment, it exhibits polluting effects, posing a significant threat 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 objective of this invention is to provide a method for selective flotation separation of chalcopyrite and arsenopyrite. The method aims to use an inhibitor to better suppress arsenopyrite, and then activate the chalcopyrite, thereby achieving a more effective separation of chalcopyrite and arsenopyrite.

[0007] Based on the above analysis, the problems and shortcomings of the existing technology are as follows:

[0008] (1) Arsene is a common arsenic-bearing mineral that often occurs together with chalcopyrite in polymetallic sulfide deposits. The ore has a small particle size distribution and complex symbiotic relationships. Arsene and chalcopyrite have similar surface properties, which unfortunately makes their flotation properties similar.

[0009] (2) The presence of certain ions (such as copper ions) in the slurry inevitably activates the flotation of arsenopyrite, which in particular complicates the separation of arsenopyrite and chalcopyrite. The arsenopyrite added to copper concentrate not only affects the quality of the concentrate and reduces its economic value, but also complicates the downstream pyrometallurgical processes. Summary of the Invention

[0010] To address the problems existing in the prior art, the present invention provides a method for separating chalcopyrite and arsenopyrite by flotation using oxidants and complexing agents.

[0011] This invention is achieved by using an oxidizing agent and a complexing agent for flotation separation of chalcopyrite and arsenopyrite, comprising:

[0012] S1, after grinding the raw chalcopyrite and arsenopyrite ore to be processed, prepare the slurry according to the ratio of chalcopyrite to arsenopyrite of 4:1;

[0013] S2, add oxidant to the slurry obtained from S1 to adjust the slurry;

[0014] S3, add the complexing agent ammonium carbamate to the slurry obtained in S2, and adjust the slurry;

[0015] S4. The slurry obtained from S3 is subjected to flotation using conventional processes to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

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

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

[0018] Furthermore, in S1, the chalcopyrite and arsenopyrite are ground by grinding the raw ore to a particle size of -74μm, which accounts for 85% of the total, or by grinding the mixed ore sample to a particle size of -200~325 mesh.

[0019] Furthermore, the oxidant in S2 is ClO2, H2O2, or O3, and the amount added is 8.0 × 10⁻⁶. -4 mol / L;

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

[0021] Furthermore, the complexing agent in S3 is ammonium carbamate, and the addition amount is 5.0 × 10⁻⁶. -4 mol / L.

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

[0023] The preparation module is used to prepare a slurry by grinding the raw chalcopyrite and arsenopyrite ore to be processed, according to a chalcopyrite to arsenopyrite ratio of 4:1.

[0024] The slurry conditioning module is used to add oxidant to the obtained slurry for conditioning.

[0025] The mixing module is used to add the complexing agent ammonium carbamate to the obtained slurry for slurry conditioning;

[0026] The flotation module is used to perform flotation on the obtained slurry using conventional processes to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0027] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:

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

[0029] When ammonium carbamate dissolves in water, it produces NH4HCO3 and NH3·H2O. The Cu on the surface of chalcopyrite reacts with the NH4+ ions generated from NH4HCO3 and NH3·H2O. + The reaction produces a copper-ammonium complex, which increases the activity of copper atoms on the surface. Copper is more easily adsorbed onto the chalcopyrite surface, thus activating the chalcopyrite.

[0030] The principle of this invention is as follows: a method for separating chalcopyrite and arsenopyrite by flotation using an oxidant and a complexing agent. An oxidant is added to the flotation pulp system, inhibiting the oxidation of arsenopyrite and controlling its recovery rate to below 10%. Simultaneously, some chalcopyrite is also inhibited. Then, ammonium carbamate is added. The ionized anions and cations of ammonium carbamate form stable adsorption by forming a double complex with copper on the surface of the chalcopyrite mineral. This double complex with copper ions in the pulp solution increases the number of active sites on the mineral surface. Because the copper activity on the chalcopyrite mineral surface is increased, copper is more likely to undergo displacement reactions, thus enhancing the hydrophobicity of the chalcopyrite surface and creating better conditions for the flotation separation of chalcopyrite and arsenopyrite.

[0031] Secondly, the process of this invention has high recovery index, simple process, easy operation, low production cost, and is environmentally friendly and energy-saving.

[0032] (1) The expected benefits and commercial value of the technical solution after the transformation of the present invention are as follows: 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 enterprises.

[0033] (2) The technical solution of the present invention fills the technical gap in the industry at home and abroad: At present, in industrial production, organic ammonium is used as an activator and complexing agent after oxidation to promote the separation of chalcopyrite and arsenopyrite.

[0034] Third, the technical solutions of this invention solve the technical problems of existing technologies and achieve significant technological progress in industrial applications.

[0035] I. Existing Technical Problems to be 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: Chalcopyrite and arsenopyrite have similar physical properties and surface chemical characteristics in the slurry, making it difficult for traditional flotation processes to achieve efficient separation, which ultimately affects the purity of the concentrate and the quality of the product.

[0038] 2. Inefficient use of flotation reagents: Reagents used in traditional flotation processes often cannot specifically inhibit or activate specific minerals, resulting in a significant environmental impact from the flotation process. In addition, the large amount of reagents used leads to high costs and reduces production efficiency.

[0039] 3. Environmental pollution issues: Arsenic contains harmful elements such as arsenic. Traditional flotation methods often cannot 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, making it difficult to stably control flotation conditions, resulting in large fluctuations in separation performance and making them unsuitable for large-scale production.

[0041] II. Technical Solution of the Invention

[0042] To address the aforementioned technical problems, this invention proposes a flotation separation technique that utilizes the synergistic effect of oxidants and complexing agents, significantly improving the separation efficiency of chalcopyrite and arsenopyrite. The method includes the following key steps:

[0043] 1. Selective inhibition effect 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 for it to adsorb flotation reagents, so that it mainly remains in the pulp during the flotation process.

[0044] 2. Targeted activation of complexing agents: The addition of ammonium carbamate as a complexing agent selectively activates the surface of arsenopyrite particles, enhances the adsorption capacity of arsenopyrite for flotation reagents, and preferentially floats arsenopyrite to achieve efficient separation from chalcopyrite.

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

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

[0047] III. Significant Technological Advancements

[0048] Based on solving the problems of the prior art, the present invention has achieved the following significant technical advancements:

[0049] 1. Significantly improved separation efficiency: The combined use of oxidants and complexing agents greatly improves the separation selectivity of chalcopyrite and arsenopyrite, enabling the production of high-purity chalcopyrite concentrate and reducing the residual amount of arsenopyrite.

[0050] 2. Reduced reagent usage and cost: Due to the selective effect of oxidants and complexing agents, this invention reduces the amount of flotation reagents used, significantly lowering production costs and improving economic efficiency.

[0051] 3. Improved environmental performance: By selecting environmentally friendly reagents and effectively separating arsenic minerals, this invention reduces the environmental pollution problems commonly found in traditional flotation processes, especially the risk of arsenic pollution to water and soil, which meets the green development needs of modern industry.

[0052] 4. Process stability and ease of operation: The process design of this invention is simple and easy to operate, reducing complex flotation reagent combinations and adjustment steps, ensuring the stability and efficiency of flotation separation, and making it 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, expanding its application range in the non-ferrous metal beneficiation industry.

[0054] This invention achieves highly efficient separation of chalcopyrite and arsenopyrite during flotation through an innovative combination of oxidants and complexing agents, solving problems such as poor separation selectivity, environmentally unfriendly reagent use, and high costs in traditional flotation methods. This technical solution not only improves separation efficiency and product purity but also reduces reagent costs and environmental risks, possessing significant industrial application value and promotion potential, and providing new ideas and technical support for the development of green mineral processing technology. Attached Figure Description

[0055] Figure 1 This is a flowchart of a method for separating chalcopyrite and arsenopyrite by flotation using oxidants and complexing agents, provided in an embodiment of the present invention.

[0056] Figure 2 This is a detailed flowchart of the method for separating chalcopyrite and arsenopyrite by flotation using oxidants (ClO2, H2O2, O3) and complexing agents (ammonium carbamate) provided in the embodiments of the present invention.

[0057] Figure 3 This is a system structure diagram of the flotation separation of chalcopyrite and arsenopyrite using oxidants and complexing agents provided in the embodiments of the present invention. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0059] like Figure 1 As shown in the figure, an embodiment of the present invention provides a method for separating chalcopyrite and arsenopyrite by flotation using an oxidizing agent and a complexing agent, comprising the following steps:

[0060] like Figure 1 , 2 As shown in the embodiments of the present invention, the method for separating chalcopyrite and arsenopyrite by flotation using oxidants (ClO2, H2O2, O3) and complexing agents (ammonium carbamate) includes the following steps:

[0061] S1, after grinding the raw chalcopyrite and arsenopyrite ore to be processed, prepare the slurry according to the ratio of chalcopyrite to arsenopyrite of 4:1;

[0062] S2, add oxidant to the slurry obtained from S1 to adjust the slurry;

[0063] S3, add the complexing agent ammonium carbamate to the slurry obtained in S2, and adjust the slurry;

[0064] S4. The slurry obtained from S3 is subjected to flotation using conventional processes to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0065] Arsene and chalcopyrite have similar surface properties, which unfortunately makes them similar in flotation properties. To address the problem of poor flotation separation due to their similar surface properties and similar flotation properties, this invention provides a method for separating chalcopyrite and chalcopyrite by flotation using oxidants (ClO2, H2O2, O3) and complexing agents (ammonium carbamate).

[0066] To better achieve the above objectives, the method for separating chalcopyrite and arsenopyrite by flotation using oxidants (ClO2, H2O2, O3) and complexing agents (ammonium carbamate) provided in this invention includes the following steps:

[0067] 1) Mix the raw chalcopyrite ore and arsenopyrite ore, or the chalcopyrite ore after grinding, with water to prepare a slurry with a mass concentration of 20%, and then adjust the slurry for 2 minutes.

[0068] 2) Add oxidant to the slurry obtained in step 1) and adjust the slurry for 3 minutes;

[0069] 3) Add the complexing agent ammonium carbamate to the slurry obtained in step 2), and adjust the slurry for 3 minutes.

[0070] 4) The slurry obtained in step 3) is subjected to flotation using conventional processes to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0071] Step 1) refers to grinding chalcopyrite and arsenopyrite ore until the particles with a fineness of -74μm account for about 85% of the total, or grinding the ore sample to a fineness of -200~325 mesh.

[0072] The oxidant mentioned in step 2) is ClO2, H2O2, or O3, and its addition amount is 8.0 × 10⁻⁶. -4 mol / L.

[0073] The complexing agent mentioned in step 3) is ammonium carbamate, and its addition amount is 5.0 × 10⁻⁶. -4 mol / L

[0074] Adding an oxidant to the flotation slurry system inhibits the oxidation of arsenopyrite, controlling the recovery rate of arsenopyrite to below 10%. At the same time, some chalcopyrite will also be inhibited. Then, ammonium carbamate is added. The copper on the surface of chalcopyrite reacts with the anions and cations ionized by ammonium carbamate to form a stable adsorption through double complexation, giving the mineral surface more active sites and thus activating the chalcopyrite. This allows for more effective separation of chalcopyrite and arsenopyrite.

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

[0076] The preparation module is used to prepare a slurry by grinding the raw chalcopyrite and arsenopyrite ore to be processed, with a chalcopyrite to arsenopyrite ratio of 4:1.

[0077] The slurry conditioning module is used to add oxidant to the obtained slurry for conditioning.

[0078] The mixing module is used to add the complexing agent ammonium carbamate to the obtained slurry for slurry conditioning;

[0079] The flotation module is used to perform flotation on the obtained slurry using conventional processes to obtain a mixed concentrate of chalcopyrite and arsenopyrite.

[0080] In this embodiment of the invention, experiments were conducted using copper ore from different stages, the main ore component of which was arsenic sulfide.

[0081] Description of the implementation process of this invention:

[0082] As attached Figure 1 As shown, 500g of the raw ore of this invention is added to a ball mill, and 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 cell. Based on the dry weight of each ton of raw ore, the mixture is stirred for 5 minutes, and then oxidant (ClO2, H2O2 or O3) a' 1600g / t, ammonium carbamate b' 1000g / t, butyl xanthate c' 10g / t, and No. 2 oil d' 5g / t are added in sequence. After stirring and adjusting the slurry for 10 minutes, the first copper roughing I is carried out to obtain the separated flotation concentrate product and tailings. The copper roughing froth of the concentrate product is subjected to a blank cleaning to obtain low arsenic copper concentrate 1 and cleaned tailings.

[0083] The tailings from roughing I and cleaning tailings are mixed, and 10 g / t of butyl xanthate and 5 g / t of No. 2 oil are added. After stirring and adjusting the slurry for 10 minutes, the first scavenging I is carried out to obtain scavenging concentrate and tailings. The scavenging concentrate and the cleaning product from roughing II are combined and then two copper cleaning operations are carried out to obtain low-arsenic copper concentrate 2. The tailings from the copper cleaning operation are returned to the previous flotation operation in sequence.

[0084] Add 10g / t of butyl xanthate and 5g / t of No. 2 oil to the tailings of scavenging I in sequence. After stirring and adjusting the slurry for 10 minutes, carry out the second scavenging II 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 were sequentially added with butyl xanthate c'10g / t and No. 2 oil d'5g / t. After stirring and adjusting the slurry for 10 minutes, a third scavenging III process was carried out to obtain scavenging concentrate and tailings. The tailings from scavenging III were produced as the final tailings product, while the concentrate was returned to the previous flotation operation.

[0086] The following examples were completed according to the above process: Example 1 The raw ore used in this example has a copper content of 0.57% and an arsenic content of 0.035%. The inhibitors and activators used are all analytical grade.

[0087] The test results obtained after processing the above embodiments according to the implementation process are shown in Table 1 below:

[0088]

[0089] The following examples were completed according to the above process: Example 1 The raw ore used in this example has a copper content of 0.93% and an arsenic content of 0.041%. The inhibitors and activators used are all analytical grade.

[0090] The test results obtained after processing the above embodiments according to the implementation process are shown in Table 2 below:

[0091]

[0092] By using the method of this invention for copper-arsenic separation, the copper recovery rate is high, achieving a good copper-arsenic separation objective.

[0093] This invention provides a method for separating chalcopyrite and arsenopyrite by flotation using oxidants and complexing agents. First, the raw chalcopyrite and arsenopyrite ore to be processed are ground. The purpose of grinding is to refine the ore particles to a sufficient particle size, making the subsequent flotation process more efficient. Specifically, the raw ore is ground until particles with a fineness of -74 μm account for 85% of the total, or the mixed ore sample is ground to a fineness of 200 to 325 mesh, thereby increasing the exposed surface area and reactivity of the minerals. Then, the ore is mixed at a ratio of chalcopyrite to arsenopyrite of 4:1 to form a mixed ore sample, and water is added to prepare a slurry with a mass concentration of 4% to ensure suitable fluidity and uniform slurry distribution.

[0094] After the slurry is prepared, an oxidant is added. This step is one of the key steps in separating chalcopyrite and arsenopyrite. The oxidant can be chlorine dioxide (ClO2), hydrogen peroxide (H2O2), or ozone (O3), added at a rate of 8.0 × 10⁻⁶. -4 The oxidant's function is to alter the charge characteristics and surface chemical properties of chalcopyrite and arsenopyrite, inhibiting the surface activity of chalcopyrite and making it less susceptible to adsorbing flotation reagents. After adding the oxidant, the pulp is prepared for 3 minutes to ensure its uniform distribution in the pulp and sufficient reaction with the mineral particle surface, thus ensuring better selectivity of the subsequent complexing agent.

[0095] After oxidation treatment, ammonium carbamate (NH2COONH4) is added as a complexing agent to the slurry at a dosage of 5.0 × 10⁻⁶. - 4 The complexing agent (mol / L) selectively activates the surface of arsenopyrite particles, enhancing their affinity for flotation reagents while having minimal impact on the chalcopyrite surface. This selective activation causes arsenopyrite to float preferentially during flotation, thus achieving separation from chalcopyrite. The use of ammonium carbamate is based on its unique complexing effect; by adjusting the surface chemistry of arsenopyrite, it increases the adsorption of flotation reagents on the arsenopyrite surface, thereby enhancing the flotation separation effect.

[0096] After adding the complexing agent and conditioning the pulp, the components of the slurry are evenly distributed, and flotation separation is ready. The conditioned slurry is then fed into the flotation cell for conventional flotation operations. During flotation, arsenopyrite, due to its activated surface, preferentially combines with the frothing agent and is carried away, while chalcopyrite, due to the inhibitory effect of the oxidant, combines less with the flotation reagents and thus remains in the slurry. This flotation process based on surface chemical differences effectively separates chalcopyrite and arsenopyrite.

[0097] In the flotation process, various reagents play an indispensable role. Oxidants play a key role in inhibiting the surface activity of chalcopyrite, while complexing agents enhance the flotation selectivity of arsenopyrite. During flotation, the selection and dosage of reagents directly affect the final separation efficiency. In this process, the dosage of oxidants and complexing agents is precisely controlled to ensure the selective effect of reagent concentrations on the mineral surface, thereby improving the flotation separation effect and product purity.

[0098] The flotation separation process of this invention has significant advantages in industrial applications. First, the combined use of oxidants and complexing agents achieves highly efficient separation of chalcopyrite and arsenopyrite, with simple operation and stable results. Second, this process avoids the excessive use of harmful reagents, reducing negative environmental impacts. Because the reaction conditions are relatively mild, and the concentrations of oxidants and complexing agents are moderate, the flotation reagents have a smaller environmental burden, making the process more environmentally friendly. Furthermore, the overall process conditions are suitable for conventional ore processing environments, making it suitable for large-scale industrial application.

[0099] This invention precisely controls the separation behavior of chalcopyrite and arsenopyrite in flotation by combining the inhibitory effect of an oxidant with the selective activation of a complexing agent. The synergistic effect of the oxidant and complexing agent optimizes the surface properties of the minerals, causing arsenopyrite to float preferentially while chalcopyrite remains in the pulp, achieving excellent separation results. This highly efficient separation process not only improves the purity and quality of the flotation concentrate but is also environmentally friendly and feasible, possessing significant industrial application value.

[0100] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for the flotation separation of chalcopyrite and arsenopyrite using an oxidizing agent and a complexing agent, characterized in that, It comprises the following steps: S1, preparing chalcopyrite and arsenopyrite raw ore to be treated or after grinding, according to the ratio of chalcopyrite and arsenopyrite 4:1, and water to prepare a slurry with a mass concentration of 20%, and then conditioning for 2 min; S2, adding an oxidizing agent to the slurry obtained in S1, and conditioning for 3 min; S3, adding a complexing agent ammonium carbamate to the slurry obtained in S2, and conditioning for 3 min; S4, performing flotation on the slurry obtained in S3 according to the conventional process to obtain chalcopyrite and arsenopyrite mixed concentrate; The grinding in S1 is to grind the chalcopyrite and arsenopyrite raw ore to a fineness of 85% of the total amount of particles of-74 μm, or to grind the ore sample to a fineness of-200-325 mesh; The oxidant in S2 is ClO2, H2O2 or O3, and the added amount is 8.0×10 -4 mol / L; The complexing agent in the S3 is ammonium carbamate, and the added amount is 5.0 x 10 -4 mol / L.

2. A system for separating chalcopyrite and arsenopyrite by using an oxidizing agent and a complexing agent according to the method of claim 1, characterized by, The system for separating chalcopyrite and arsenopyrite by flotation using an oxidizing agent and a complexing agent comprises: A preparation module for preparing chalcopyrite and arsenopyrite raw ore to be treated after grinding according to the ratio of chalcopyrite and arsenopyrite 4:1, and a slurry; A conditioning module for adding an oxidizing agent to the obtained slurry and conditioning; A mixing module for adding a complexing agent ammonium carbamate to the obtained slurry and conditioning; A flotation module for performing flotation on the obtained slurry according to the conventional process to obtain chalcopyrite and arsenopyrite mixed concentrate.

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