Method for flotation separation and enrichment of chalcopyrite and chalcopyrite

Abstract

The invention discloses a chalcopyrite and sulfur-arsenic copper flotation separation and enrichment method, and belongs to the technical field of beneficiation. Selective flotation separation of chalcopyrite and sulfur-arsenic copper is achieved through the combined effect of hydrogen peroxide oxidation modification and sodium sulfite desorption of a collecting agent, and high-arsenic copper concentrate is obtained; and then, through a'deinhibition activation-efficient collector powerful collection 'technology, a mixture of ethylenediamine tetraacetic acid and ammonium carbamate is used for activating the chalcopyrite, dibutyl phosphate ammonium salt is used as an efficient collector, effective enrichment of the chalcopyrite is achieved, and low-arsenic copper concentrate is obtained. The method is simple and convenient, industrial production is easy, good copper and arsenic separation and enrichment effects are achieved, the copper grade of the low-arsenic copper concentrate is larger than 23%, the arsenic content of the low-arsenic copper concentrate is smaller than 0.5%, the arsenic content of the high-arsenic copper concentrate is larger than 8%, and the recovery rate of total copper is larger than 90%.

Description

Technical Field

[0001] The invention belongs to the technical field of ore dressing, and in particular relates to a method for flotation separation and enrichment of chalcopyrite and arsenic sulfate copper ore. Background Art

[0002] Arsenic-containing copper sulfide ore is one of the important raw materials for obtaining copper concentrate. Flotation is the most commonly used technology for sorting such ores. However, the flotation separation of chalcopyrite and arsenic-sulfide copper ore is relatively difficult because these two minerals have good natural floatability and the selectivity of mineral processing agents to minerals is poor. On the other hand, the mineral surfaces are rich in Cu and S active particles, and the floatability is very close, so that the conventional mineral processing agent system and mineral processing method will cause the simultaneous enrichment of chalcopyrite and arsenic-sulfide copper ore, and finally make the arsenic content of copper concentrate exceed the standard. The arsenic content in the flotation concentrate is too high, which will not only cause great pollution to the environment during the smelting process, but also greatly increase the processing cost. Therefore, the research and development of flotation separation and enrichment technology of chalcopyrite and arsenic-sulfide copper ore is of great practical significance for improving product quality and improving the smelting environment.

[0003] Research on flotation separation methods for copper and arsenic has been reported. The invention patent with application number 201010229759.9 discloses "Collectors and treatment methods for arsenic-containing copper ore beneficiation". Using isopropyl ethylthiocarbamate and kerosene as collectors, low-arsenic copper concentrate and high-arsenic copper concentrate are obtained respectively through the steps of grinding, copper roughing, copper concentration, arsenic roughing, arsenic concentration and arsenic scavenging. Since this method does not take into account the inhibition of arsenic-containing copper minerals, there is a deficiency that arsenic-containing copper minerals can easily enter the copper concentrate during copper roughing and copper concentration. The invention patents with application numbers 201811472623.3 and 201610273822.6 disclose "a composite inhibitor for copper-arsenic mineral separation and flotation" and "a composite beneficiation inhibitor for copper-arsenic separation and flotation", respectively. The former is prepared by mixing Na2S2O8, sodium humate and Na5P3O 10 The latter selectively inhibits arsenic-containing copper minerals such as arsenic copper sulfide and arsenic copper sulfide through a specific combination of calcium hypochlorite, sodium humate and sodium hexametaphosphate, and is implemented on low-arsenic copper ores, but its adaptability to high-arsenic copper ores remains to be verified. The invention patent with application number 201410352506.9 discloses a "method for selecting copper concentrate from copper ores with high arsenic content". This method first inhibits pyrite, preferentially floats copper minerals in steps, and then uses the re-grinding deoxidation method to mix lime and calcium hypochlorite, and preferentially oxidizes arsenic-free copper sulfide minerals with potassium permanganate, and then selectively removes arsenic copper sulfide from copper concentrate. This method has the problem of large amount of oxidant (calcium hypochlorite, potassium permanganate) added and arsenic-containing copper sulfide ores are also easily inhibited by oxidation. Based on the above status quo, the separation process and technology of arsenic-containing copper sulfide ores need to be improved. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a method for flotation separation and enrichment of chalcopyrite and arsenic copper ore. Based on the difference in the difficulty of surface oxidation of copper and arsenic minerals, the present invention realizes the separation and enrichment of chalcopyrite and arsenic copper ore through the technical routes of "hydrogen peroxide oxidation modification-sodium sulfite desorption collector" and "deinhibition activation-high-efficiency collector strong collection".

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The invention provides a method for flotation separation and enrichment of chalcopyrite and arsenic-sulfur copper ore. Lime and hydrogen peroxide are added in the process of grinding the raw ore, and then a collector, an inhibitor and a frother are added. A process of two roughing selections and two concentrating selections is adopted to suppress copper and float arsenic to obtain high-arsenic copper concentrate and copper-containing tailings. An activator, a high-efficiency collector and a frother are added to the copper-containing tailings, and a process of one roughing selection, one scavenging selection and three concentrating selections is adopted to select copper to obtain low-arsenic copper concentrate and tailings.

[0007] Furthermore, the method for flotation separation and enrichment of chalcopyrite and arsenic copper ore comprises the following steps:

[0008] (1) adding lime and hydrogen peroxide (H2O2) into a ball mill to grind the raw ore to obtain a ground material, and sequentially adding a collector, a chalcopyrite inhibitor and a frother to the ground material to perform a roughing I for suppressing copper and floating arsenic, thereby obtaining a roughing I concentrate and a roughing I tailings;

[0009] (2) adding hydrogen peroxide, a collector, a chalcopyrite inhibitor and a frother to the roughing I tailings in sequence, and performing roughing II for suppressing copper and floating arsenic, to obtain a roughing II concentrate and a roughing II tailings;

[0010] (3) combining the rougher I concentrate and the rougher II concentrate to perform arsenic concentration I to obtain arsenic concentration I concentrate and arsenic concentration I tailings, wherein the arsenic concentration I tailings are returned to the rougher I operation for suppressing copper and arsenic flotation;

[0011] (4) performing arsenic concentration II on the arsenic concentration I concentrate to obtain high-arsenic copper concentrate and arsenic concentration II tailings, wherein the arsenic concentration II tailings are returned to the arsenic concentration I operation;

[0012] (5) adding an activator, a high-efficiency collector and a frother in sequence to the roughing II tailings to perform copper roughing to obtain a copper roughing concentrate and a copper roughing tailings;

[0013] (6) adding an activator, a high-efficiency collector and a frother to the copper roughing tailings in sequence to perform copper scavenging to obtain a copper scavenging concentrate and a copper scavenging tailings;

[0014] (7) performing copper concentration I on the copper roughing concentrate to obtain copper concentration I concentrate and copper concentration I tailings, wherein the copper concentration I tailings and the copper scavenging concentrate are combined and returned to the copper roughing operation;

[0015] (8) performing copper concentration II on the copper concentration I concentrate to obtain copper concentration II concentrate and copper concentration II tailings, wherein the copper concentration II tailings are returned to the copper concentration I operation;

[0016] (9) subjecting the copper concentrate II concentrate to copper concentrate III to obtain low-arsenic copper concentrate and copper concentrate III tailings, wherein the copper concentrate III tailings are returned to the copper concentrate II operation.

[0017] In step (1), the non-arsenic-containing copper sulfide minerals in the raw ore are mainly chalcopyrite, and the arsenic-containing minerals are mainly arsenic-sulfur copper ore; and / or

[0018] The collector is butyl xanthate; and / or

[0019] The inhibitor of chalcopyrite is sodium sulfite; and / or

[0020] The foaming agent is pine oil; and / or

[0021] The grinding is carried out in a ball mill, and the fineness of the material discharged from the ball mill is -0.074 mm (ie, the material with a particle size less than 0.074 mm) accounting for 85-95 wt%.

[0022] In step (1), based on the raw ore, the amount of lime added is 800-1200 g / t; the amount of hydrogen peroxide added is 800-1000 g / t; the amount of collector added is 20-40 g / t; the amount of chalcopyrite inhibitor added is 600-800 g / t; and the amount of foaming agent added is 10-20 g / t.

[0023] Based on the difference in the difficulty of oxidation of the surfaces of copper and arsenic minerals, the present invention uses hydrogen peroxide to preferentially oxidize the surface of chalcopyrite, increase the difference in the chemical properties of the mineral surface, and strengthen the flotation separation of the mineral. The surface of chalcopyrite is rich in iron ions, which can accelerate the electron transfer in the decomposition reaction of H2O2, promote the generation of active species ·OH, and achieve the passivation modification of the surface of chalcopyrite through the strong oxidation of ·OH; because the surface of arsenic copper sulfide does not contain iron ions, the oxidation effect of H2O2 on its surface is relatively weak, and the impact on the surface of arsenic copper sulfide is small. At the same time, lime can effectively inhibit pyrite, creating good conditions for inhibiting copper floating arsenic.

[0024] In step (2), the collector is butyl xanthate; and / or

[0025] The inhibitor of chalcopyrite is sodium sulfite; and / or

[0026] The foaming agent is pine oil.

[0027] In step (2), based on the raw ore, the amount of hydrogen peroxide added is 400-500 g / t, the amount of collector added is 10-20 g / t, the amount of chalcopyrite inhibitor added is 300-400 g / t, and the amount of foaming agent added is 5-10 g / t.

[0028] The present invention promotes the attenuation of the hydrophobicity of the chalcopyrite surface by the effect of sodium sulfite desorption collector. Since chalcopyrite has a higher equilibrium potential, sodium sulfite is more likely to promote the desorption of xanthogenic acid components on the chalcopyrite surface; at the same time, sodium sulfite and the chalcopyrite surface undergo complex interactions, resulting in the chalcopyrite surface being covered by hydrophilic species (such as sulfates, hydroxyl compounds, oxides, etc.), further improving the hydrophilicity of the chalcopyrite surface.

[0029] In step (5), the activator is a mixture of ethylenediaminetetraacetic acid and ammonium carbamate in a mass ratio of 1:(1-3); and / or

[0030] The efficient collector is dibutyl phosphate ammonium salt; and / or

[0031] The foaming agent is pine oil.

[0032] The mixture of ethylenediaminetetraacetic acid and ammonium carbamate used in the present invention can effectively activate chalcopyrite, wherein the ethylenediaminetetraacetic acid can effectively complex the hydrophilic species (such as calcium hydroxyl, sulfate, hydroxyl compound, copper oxide, etc.) on the surface of the chalcopyrite to achieve the de-inhibition activation of the passivated chalcopyrite surface; and the ammonium carbamate generates copper-ammonia complex cations through a complex reaction with copper active particles on the surface of the chalcopyrite, thereby promoting the adsorption of the collector.

[0033] The dibutyl ammonium phosphate used in the present invention can achieve the selective capture of chalcopyrite. The dibutyl ammonium phosphate and the copper active particles on the surface of chalcopyrite form a stable four-membered chelate ring through the coordination of PO-Cu and P=O-Cu, which can strongly capture chalcopyrite, but its capture ability for pyrite is weak.

[0034] In step (5), based on the raw ore, the added amount of the activator is 400-800 g / t, the added amount of the high-efficiency collector is 10-30 g / t, and the added amount of the foaming agent is 10-20 g / t.

[0035] In step (6), the activator is a mixture of ethylenediaminetetraacetic acid and ammonium carbamate in a mass ratio of 1:(1-3); and / or

[0036] The efficient collector is dibutyl phosphate ammonium salt; and / or

[0037] The foaming agent is pine oil.

[0038] In step (6), based on the raw ore, the added amount of the activator is 200-400 g / t, the added amount of the high-efficiency collector is 5-15 g / t, and the added amount of the foaming agent is 5-10 g / t.

[0039] Compared with the prior art, the present invention has the following advantages and technical effects:

[0040] (1) Based on the difference in the degree of oxidation difficulty of copper and arsenic mineral surfaces, the present invention uses hydrogen peroxide to preferentially oxidize the surface of chalcopyrite, increase the difference in the chemical properties of the mineral surface, and strengthen the flotation separation of the mineral. The surface of chalcopyrite is rich in iron ions, which can accelerate the electron transfer in the decomposition reaction of H2O2 and promote the generation of active species ·OH. Through the strong oxidation of ·OH, the passivation modification of the surface of chalcopyrite is achieved; because the surface of arsenic copper sulfide does not contain iron ions, the oxidation effect of H2O2 on its surface is relatively weak, and the impact on the surface of arsenic copper sulfide is small. At the same time, lime can effectively inhibit pyrite, creating good conditions for inhibiting copper floating arsenic.

[0041] (2) The present invention promotes the attenuation of the hydrophobicity of the chalcopyrite surface through the effect of sodium sulfite desorption collector. Since chalcopyrite has a higher equilibrium potential, sodium sulfite is more likely to promote the desorption of xanthogenic acid components on the chalcopyrite surface; at the same time, sodium sulfite and the chalcopyrite surface undergo complex interactions, resulting in the chalcopyrite surface being covered by hydrophilic species (such as sulfates, hydroxyl compounds, oxides, etc.), further improving the hydrophilicity of the chalcopyrite surface.

[0042] (3) The present invention realizes the selective flotation separation of chalcopyrite and sulphur-arsenic copper by the combined action of "hydrogen peroxide oxidation modification-sodium sulfite desorption collector". Compared with the traditional research work on the surface modification and inhibitor of chalcopyrite and sulphur-arsenic copper, the present invention significantly improves the copper grade and the recovery rate of total copper.

[0043] (4) The mixture of EDTA and ammonium carbamate used in the present invention can effectively activate chalcopyrite. EDTA can effectively complex hydrophilic species (such as calcium hydroxide, sulfate, hydroxyl compound, copper oxide, etc.) on the surface of chalcopyrite to achieve deactivation of the passivated chalcopyrite surface. Ammonium carbamate generates copper-ammonia complex cations through complexation reaction with copper active particles on the surface of chalcopyrite, which promotes the adsorption of the collector.

[0044] (5) The dibutyl phosphate ammonium salt used in the present invention can achieve the selective capture of chalcopyrite. The dibutyl phosphate ammonium salt and the copper active particles on the surface of chalcopyrite form a stable four-membered chelate ring through the coordination of PO-Cu and P=O-Cu, which can strongly capture chalcopyrite, while its capture ability for pyrite is weak.

[0045] (6) The application method of the present invention is simple and easy to industrially produce, and has good copper and arsenic separation and enrichment effects. The copper grade of the low-arsenic copper concentrate is greater than 23%, the arsenic content is less than 0.5%, the arsenic content of the high-arsenic copper concentrate is greater than 8%, and the total copper recovery rate is greater than 90%. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0047] Figure 1 The present invention is a process flow chart of the flotation separation and enrichment method of chalcopyrite and arsenic copper ore. DETAILED DESCRIPTION

[0048] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0049] It should be understood that the terms described in the present invention are only for describing special embodiments and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0050] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0051] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0052] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0053] The reagents used in the embodiments of the present invention are all purchased from commercial sources.

[0054] The embodiment of the present invention provides a method for flotation separation and enrichment of chalcopyrite and arsenic copper ore, the process flow chart is as follows: Figure 1 As shown, the following steps are included:

[0055] (1) Add lime and hydrogen peroxide to the ball mill to grind the raw ore, add collector, chalcopyrite inhibitor and foaming agent to the grinding material in sequence, and perform roughing I to suppress copper and arsenic flotation (i.e. arsenic roughing I), and obtain roughing I concentrate and roughing I tailings. The non-arsenic copper sulfide minerals in the raw ore are mainly chalcopyrite, and the arsenic-containing minerals are mainly arsenic sulfide copper ore; the amount of lime added in the ball mill is 800-1200g / t (calculated according to the raw ore material, the same below); the amount of hydrogen peroxide added is 800-1000g / t, and the fineness of the material discharged from the ball mill is -0.074mm, accounting for 85-95%. The collector is butyl xanthate, and the addition amount is 20-40g / t; the chalcopyrite inhibitor is sodium sulfite, and the addition amount is 600-800g / t; the foaming agent is pine oil, and the addition amount is 10-20g / t;

[0056] (2) hydrogen peroxide, a collector, a chalcopyrite inhibitor and a frother are sequentially added to the roughing I tailings obtained in step (1) to perform roughing II for suppressing copper flotation and arsenic (i.e., arsenic roughing II), to obtain roughing II concentrate and roughing II tailings, wherein the amount of hydrogen peroxide added is 400-500 g / t; the collector is butyl xanthate, and the amount of addition is 10-20 g / t; the chalcopyrite inhibitor is sodium sulfite, and the amount of addition is 300-400 g / t; the frother is pine oil, and the amount of addition is 5-10 g / t;

[0057] (3) combining the roughing I concentrate and the roughing II concentrate obtained in steps (1) and (2) and performing arsenic concentration I to obtain arsenic concentration I concentrate and arsenic concentration I tailings, wherein the arsenic concentration I tailings are returned to the roughing I operation for suppressing copper and arsenic flotation;

[0058] (4) performing arsenic concentration II on the arsenic concentration I concentrate obtained in step (3) to obtain a high-arsenic copper concentrate and arsenic concentration II tailings, wherein the arsenic concentration II tailings are returned to the arsenic concentration I operation;

[0059] (5) adding an activator, a high-efficiency collector and a frother in sequence to the roughing II tailings obtained in step (2) to perform copper roughing to obtain a copper roughing concentrate and a copper roughing tailings, wherein the activator is a mixture of ethylenediaminetetraacetic acid and ammonium carbamate in a mass ratio of 1:(1-3) and an addition amount of 400-800 g / t; the high-efficiency collector is dibutyl ammonium phosphate in an addition amount of 10-30 g / t; and the frother is pine oil in an addition amount of 10-20 g / t;

[0060] (6) adding an activator, a high-efficiency collector and a frother in sequence to the copper rougher tailings obtained in step (5) to perform copper scavenging to obtain a copper scavenging concentrate and a copper scavenging tailings, wherein the activator is a mixture of ethylenediaminetetraacetic acid and ammonium carbamate in a mass ratio of 1:(1-3) and an addition amount of 200-400 g / t; the high-efficiency collector is dibutyl ammonium phosphate in an addition amount of 5-15 g / t; and the frother is pine oil in an addition amount of 5-10 g / t;

[0061] (7) performing copper concentration I on the copper roughing concentrate obtained in step (5) to obtain copper concentration I concentrate and copper concentration I tailings, wherein the copper concentration I tailings and the copper scavenging concentrate obtained in step (6) are combined and returned to the copper roughing operation;

[0062] (8) performing copper concentration II on the copper concentration I concentrate obtained in step (7) to obtain copper concentration II concentrate and copper concentration II tailings, wherein the copper concentration II tailings are returned to the copper concentration I operation;

[0063] (9) The copper concentrate II concentrate obtained in step (8) is subjected to copper concentrate III to obtain low-arsenic copper concentrate and copper concentrate III tailings, wherein the copper concentrate III tailings are returned to the copper concentrate II operation.

[0064] The present invention firstly realizes the selective flotation separation of chalcopyrite and sulfur-arsenic copper through the combined action of "hydrogen peroxide oxidation modification-sodium sulfite desorption collector" to obtain high-arsenic copper concentrate; then, through the "de-inhibition activation-high-efficiency collector strong collection" technology, the chalcopyrite is activated by a mixture of ethylenediaminetetraacetic acid and ammonium carbamate, and dibutyl phosphate ammonium salt is used as a high-efficiency collector to realize the effective enrichment of chalcopyrite to obtain low-arsenic copper concentrate. The method of the present invention is simple and easy to industrially produce, and has good copper and arsenic separation and enrichment effects, wherein the copper grade of the low-arsenic copper concentrate is greater than 23%, the arsenic content is less than 0.5%, the arsenic content in the high-arsenic copper concentrate is greater than 8%, and the total copper recovery rate is greater than 90% (i.e., the sum of the copper recovery rates in the low-arsenic copper concentrate and the high-arsenic copper concentrate).

[0065] It should be pointed out that the matters not described in detail in the present invention are all conventional operating means in the art and are not the focus of the present invention. For example, the specific method of grinding is completed by conventional methods.

[0066] The technical solution of the present invention is further illustrated by the following embodiments.

[0067] Example 1

[0068] The copper ore in Tibet contains 0.54% Cu, 0.18% As and 8.65% S. The non-arsenic copper sulfide minerals in the ore are mainly chalcopyrite, and the arsenic-containing minerals are mainly arsenic copper sulfide.

[0069] The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore provided in this embodiment is as follows:

[0070] (1) 800 g / t of lime (calculated as raw ore, the same below) and 800 g / t of hydrogen peroxide were added to a ball mill to grind the raw ore. The fineness of the material discharged from the ball mill was -0.074 mm, accounting for 85 wt%. 20 g / t of butyl xanthate, 600 g / t of sodium sulfite and 10 g / t of pine oil were added to the ground material in sequence. The dosing interval was 3 min. After stirring for 3 min, aeration was performed to perform roughing I to suppress copper and arsenic floating, and roughing I concentrate and roughing I tailings were obtained;

[0071] (2) adding 400 g / t of hydrogen peroxide, 10 g / t of butyl xanthate, 300 g / t of sodium sulfite and 5 g / t of pine oil to the roughing I tailings obtained in step (1) in sequence, with an interval of 3 min for adding the chemicals, stirring for 3 min, and then performing roughing II for suppressing copper and floating arsenic to obtain roughing II concentrate and roughing II tailings;

[0072] (3) combining the roughing I concentrate and the roughing II concentrate obtained in steps (1) and (2) and performing arsenic concentration I to obtain arsenic concentration I concentrate and arsenic concentration I tailings, wherein the arsenic concentration I tailings are returned to the roughing I operation for suppressing copper and arsenic flotation;

[0073] (4) performing arsenic concentration II on the arsenic concentration I concentrate obtained in step (3) to obtain a high-arsenic copper concentrate and arsenic concentration II tailings, wherein the arsenic concentration II tailings are returned to the arsenic concentration I operation;

[0074] (5) adding 600 g / t of activator (the mass ratio of ethylenediaminetetraacetic acid to ammonium carbamate is 1:1), 10 g / t of dibutyl ammonium phosphate and 10 g / t of pine oil to the roughing II tailings obtained in step (2) in sequence, with an interval of 3 min for adding the activators, stirring for 3 min, and then performing copper roughing to obtain a copper roughing concentrate and a copper roughing tailings;

[0075] (6) adding 300 g / t of activator (the mass ratio of ethylenediaminetetraacetic acid to ammonium carbamate is 1:1), 5 g / t of dibutyl ammonium phosphate and 5 g / t of pine oil to the copper rougher tailings obtained in step (5) in sequence, with an interval of 3 min for adding the agents, stirring for 3 min for copper scavenging, and obtaining copper scavenging concentrate and copper scavenging tailings;

[0076] (7) performing copper concentration I on the copper roughing concentrate obtained in step (5) to obtain copper concentration I concentrate and copper concentration I tailings, wherein the copper concentration I tailings and the copper scavenging concentrate obtained in step (6) are combined and returned to the copper roughing operation;

[0077] (8) performing copper concentration II on the copper concentration I concentrate obtained in step (7) to obtain copper concentration II concentrate and copper concentration II tailings, wherein the copper concentration II tailings are returned to the copper concentration I operation;

[0078] (9) The copper concentrate II concentrate obtained in step (8) is subjected to copper concentrate III to obtain low-arsenic copper concentrate and copper concentrate III tailings, wherein the copper concentrate III tailings are returned to the copper concentrate II operation.

[0079] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 23.13%, the arsenic content is 0.32%, and the copper recovery rate is 70.53%; the copper grade of the high-arsenic copper concentrate is 11.58%, the arsenic content is 8.05%, and the copper recovery rate is 21.13%.

[0080] Comparative Example 1

[0081] The raw ore is sorted using the traditional reagent system and method, that is, an equal mass of calcium hypochlorite is used to replace hydrogen peroxide, sodium sulfite is added before butyl xanthate, and its added amount remains unchanged, and an equal mass of butyl xanthate is used to replace dibutyl ammonium phosphate in copper roughing and copper scavenging operations.

[0082] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 21.11%, the arsenic content is 0.78%, and the copper recovery rate is 65.23%; the copper grade of the high-arsenic copper concentrate is 9.32%, the arsenic content is 7.05%, and the copper recovery rate is 17.64%.

[0083] It can be seen from Example 1 and Comparative Example 1 that by changing the type of oxidant, the order of addition of sodium sulfite and the type of collector, the sorting index of the ore decreases significantly. Among them, the copper grade in the low-arsenic copper concentrate decreases by about 2%, the copper recovery rate decreases by about 5%, the arsenic content increases significantly from 0.32% to 0.78%, and the index of the high-arsenic copper concentrate also decreases. Compared with hydrogen peroxide, the combined action of hypochlorite and calcium ions in calcium hypochlorite is more likely to cause the inhibition of arsenic copper ore, thereby increasing the arsenic content in the low-arsenic copper concentrate and reducing the recovery rate of the high-arsenic copper concentrate. Sodium sulfite is added before the collector, which is easy to cause the hydrophilicity of the surface of arsenic copper ore, which is not conducive to suppressing copper floating arsenic. Sodium sulfite is added after the collector. Since chalcopyrite has a higher equilibrium potential, sodium sulfite is more likely to promote the desorption of xanthate components on the surface of chalcopyrite, thereby improving the hydrophilicity of the surface of chalcopyrite. Compared with butyl xanthate, dibutyl ammonium phosphate can coordinate with the copper active particles on the surface of chalcopyrite through PO-Cu and P=O-Cu to form a stable four-membered chelate ring, which can strongly capture chalcopyrite.

[0084] Comparative Example 2

[0085] The other conditions are consistent with those in Example 1, except that hydrogen peroxide is not added in the raw ore grinding operation and the roughing II operation for suppressing copper and arsenic flotation, and the effect of hydrogen peroxide is to be analyzed.

[0086] The final separation indicators obtained were: the copper grade of the low-arsenic copper concentrate was 21.13%, the arsenic content was 0.68%, and the copper recovery rate was 67.13%; the copper grade of the high-arsenic copper concentrate was 10.38%, the arsenic content was 8.55%, and the copper recovery rate was 16.84%.

[0087] It can be seen from Example 1 and Comparative Example 2 that the copper recovery rate in the low-arsenic copper concentrate decreases significantly and the arsenic content increases. The reason is that hydrogen peroxide tends to preferentially oxidize chalcopyrite, thereby inhibiting chalcopyrite. Without the addition of hydrogen peroxide, chalcopyrite easily enters the high-arsenic copper concentrate while suppressing copper flotation arsenic, resulting in a significant decrease in the copper recovery rate in the low-arsenic copper concentrate. At the same time, arsenic-sulfur copper ore also easily enters the low-arsenic copper concentrate.

[0088] Comparative Example 3

[0089] The other conditions are consistent with those in Example 1, except that sodium sulfite is not added in the roughing I and roughing II operations for suppressing copper and arsenic flotation, and the effect of sodium sulfite is to be analyzed.

[0090] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 22.06%, the arsenic content is 0.62%, and the copper recovery rate is 63.53%; the copper grade of the high-arsenic copper concentrate is 11.38%, the arsenic content is 7.82%, and the copper recovery rate is 17.86%.

[0091] It can be seen from Example 1 and Comparative Example 3 that the copper recovery rate in the low-arsenic copper concentrate is significantly reduced. The reason is that sodium sulfite can promote the desorption of xanthate components on the surface of chalcopyrite; and cause the surface of chalcopyrite to be covered with hydrophilic species (such as sulfates, hydroxyl compounds, oxides, etc.), thereby increasing the hydrophilicity of the surface of chalcopyrite. Without the addition of sodium sulfite, chalcopyrite can easily enter the high-arsenic copper concentrate while suppressing copper flotation, resulting in a significant decrease in the copper recovery rate in the low-arsenic copper concentrate. Example 2

[0092] The copper ore contains 0.75% Cu, 0.48% As and 10.23% S. The non-arsenic copper sulfide minerals in the ore are mainly chalcopyrite, and the arsenic-containing minerals are mainly arsenic copper sulfide.

[0093] The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore provided in this embodiment is as follows:

[0094] (1) Add 1000 g / t of lime (calculated as raw ore, the same below) and 900 g / t of hydrogen peroxide to grind the raw ore in a ball mill, and the fineness of the material discharged from the ball mill is -0.074 mm, accounting for 90 wt%. Add 30 g / t of butyl xanthate, 700 g / t of sodium sulfite and 15 g / t of pine oil to the ground material in sequence, with an interval of 4 min for adding the materials, stir for 4 min, and then aerate to perform roughing I for suppressing copper and floating arsenic, to obtain roughing I concentrate and roughing I tailings;

[0095] (2) adding 450 g / t of hydrogen peroxide, 15 g / t of butyl xanthate, 350 g / t of sodium sulfite and 7.5 g / t of pine oil to the roughing I tailings obtained in step (1) in sequence, with an interval of 4 min for adding the chemicals, stirring for 4 min, and then performing roughing II for suppressing copper and floating arsenic to obtain roughing II concentrate and roughing II tailings;

[0096] (3) combining the roughing I concentrate and the roughing II concentrate obtained in steps (1) and (2) and performing arsenic concentration I to obtain arsenic concentration I concentrate and arsenic concentration I tailings, wherein the arsenic concentration I tailings are returned to the roughing I operation for suppressing copper and arsenic flotation;

[0097] (4) performing arsenic concentration II on the arsenic concentration I concentrate obtained in step (3) to obtain a high-arsenic copper concentrate and arsenic concentration II tailings, wherein the arsenic concentration II tailings are returned to the arsenic concentration I operation;

[0098] (5) adding 700 g / t of activator (the mass ratio of ethylenediaminetetraacetic acid to ammonium carbamate is 1:2), 20 g / t of dibutyl ammonium phosphate and 15 g / t of pine oil to the roughing II tailings obtained in step (2) in sequence, with an interval of 4 min for adding the activators, stirring for 4 min, and then performing copper roughing to obtain a copper roughing concentrate and a copper roughing tailings;

[0099] (6) adding 350 g / t of activator (the mass ratio of ethylenediaminetetraacetic acid to ammonium carbamate is 1:2), 10 g / t of dibutyl ammonium phosphate and 7.5 g / t of pine oil to the copper rougher tailings obtained in step (5) in sequence, with an interval of 4 min for adding the agents, stirring for 4 min for copper scavenging, and obtaining copper scavenging concentrate and copper scavenging tailings;

[0100] (7) performing copper concentration I on the copper roughing concentrate obtained in step (5) to obtain copper concentration I concentrate and copper concentration I tailings, wherein the copper concentration I tailings and the copper scavenging concentrate obtained in step (6) are combined and returned to the copper roughing operation;

[0101] (8) performing copper concentration II on the copper concentration I concentrate obtained in step (7) to obtain copper concentration II concentrate and copper concentration II tailings, wherein the copper concentration II tailings are returned to the copper concentration I operation;

[0102] (9) The copper concentrate II concentrate obtained in step (8) is subjected to copper concentrate III to obtain low-arsenic copper concentrate and copper concentrate III tailings, wherein the copper concentrate III tailings are returned to the copper concentrate II operation.

[0103] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 27.65%, the arsenic content is 0.42%, and the copper recovery rate is 76.32%; the copper grade of the high-arsenic copper concentrate is 10.28%, the arsenic content is 11.48%, and the copper recovery rate is 17.45%.

[0104] Comparative Example 4

[0105] The raw ore is sorted using the traditional reagent system and method, that is, potassium permanganate is used instead of hydrogen peroxide with an equal mass, sodium thiosulfate is used instead of sodium sulfite with an equal mass and added before butyl xanthate, and butyl xanthate is used instead of dibutyl ammonium phosphate in the rough copper flotation and scavenging operations.

[0106] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 24.25%, the arsenic content is 0.82%, and the copper recovery rate is 72.62%; the copper grade of the high-arsenic copper concentrate is 9.82%, the arsenic content is 10.32%, and the copper recovery rate is 15.24%.

[0107] It can be seen from Example 2 and Comparative Example 4 that by changing the type of oxidant, the type and order of addition of the inhibitor, and the type of the collector, the sorting index of the ore decreases significantly. Among them, the copper grade in the low-arsenic copper concentrate decreases by about 3%, the copper recovery rate decreases by about 4%, the arsenic content increases significantly from 0.42% to 0.82%, and the index of the high-arsenic copper concentrate also decreases. Potassium permanganate has a strong oxidizing property, which can easily cause the inhibition of arsenic copper ore, thereby increasing the arsenic content in the low-arsenic copper concentrate and reducing the recovery rate of the high-arsenic copper concentrate. Sodium thiosulfate is easily adsorbed on the surface of arsenic copper ore, which is not conducive to the inhibition of copper floating arsenic. Compared with butyl xanthate, dibutyl ammonium phosphate can form a stable four-membered chelate ring with the copper active particles on the surface of chalcopyrite through PO-Cu and P=O-Cu coordination, which can strongly capture chalcopyrite.

[0108] Comparative Example 5

[0109] The other conditions are consistent with those in Example 2, except that no activator (ethylenediaminetetraacetic acid and ammonium carbamate) is added in the float copper roughing operation and the scavenging operation, and the influence of the activator is intended to be analyzed.

[0110] The final selection indicators obtained were: the copper grade of the low-arsenic copper concentrate was 23.13%, the arsenic content was 0.48%, and the copper recovery rate was 66.53%; the copper grade of the high-arsenic copper concentrate was 10.08%, the arsenic content was 11.82%, and the copper recovery rate was 17.84%.

[0111] It can be seen from Example 2 and Comparative Example 5 that when no activator is added, the copper grade in the low-arsenic copper concentrate decreases by about 4%, and the copper recovery rate decreases by about 10 percentage points. The reason is that the mixture of ethylenediaminetetraacetic acid and ammonium carbamate used in the present invention can effectively activate chalcopyrite. Ethylenediaminetetraacetic acid can effectively complex hydrophilic species (such as calcium hydroxide, sulfate, hydroxyl compound, copper oxide, etc.) on the surface of chalcopyrite to achieve de-inhibition activation of the passivated chalcopyrite surface. Ammonium carbamate generates copper-ammonia complex cations through complex reaction with copper active particles on the surface of chalcopyrite, which promotes the adsorption of the collector.

[0112] Comparative Example 6

[0113] The other conditions are the same as those in Example 2, except that an equal amount of ethionamide is used instead of dibutyl ammonium phosphate in the roughing and scavenging operations of the float copper.

[0114] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 25.34%, the arsenic content is 0.46%, and the copper recovery rate is 72.13%; the copper grade of the high-arsenic copper concentrate is 10.62%, the arsenic content is 11.02%, and the copper recovery rate is 18.04%.

[0115] It can be seen from Example 2 and Comparative Example 6 that after ethiocarbamate replaces dibutyl ammonium phosphate, the copper grade in the low-arsenic copper concentrate decreases by about 2%, and the copper recovery rate decreases by about 4 percentage points. The reason is that the dibutyl ammonium phosphate used in the present invention has a stronger chelating property on the surface of chalcopyrite and can strongly capture chalcopyrite.

[0116] Example 3

[0117] The copper ore used in this embodiment has a Cu grade of 1.1%, an As content of 0.65%, and an S content of 14.58%. The non-arsenic-containing copper sulfide minerals in the ore are mainly chalcopyrite, and the arsenic-containing minerals are mainly arsenic-sulfur copper ore.

[0118] The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore provided in this embodiment is as follows:

[0119] (1) Add 1200g / t of lime (calculated as raw ore, the same below) and 1000g / t of hydrogen peroxide to the ball mill to grind the raw ore. The fineness of the material discharged from the ball mill is -0.074mm, accounting for 95%. Add 40g / t of butyl xanthate, 800g / t of sodium sulfite and 20g / t of pine oil to the grinding material in sequence, with an interval of 5min for adding the medicines. After stirring for 5min, aerate the raw ore to suppress copper and arsenic floating, and obtain raw ore concentrate and raw ore tailings;

[0120] (2) adding 500 g / t of hydrogen peroxide, 20 g / t of butyl xanthate, 400 g / t of sodium sulfite and 10 g / t of pine oil to the roughing I tailings obtained in step (1) in sequence, with an interval of 5 min for adding the drugs, stirring for 5 min, and then performing roughing II for suppressing copper and floating arsenic to obtain roughing II concentrate and roughing II tailings;

[0121] (3) combining the roughing I concentrate and the roughing II concentrate obtained in steps (1) and (2) and performing arsenic concentration I to obtain arsenic concentration I concentrate and arsenic concentration I tailings, wherein the arsenic concentration I tailings are returned to the roughing I operation for suppressing copper and arsenic flotation;

[0122] (4) performing arsenic concentration II on the arsenic concentration I concentrate obtained in step (3) to obtain a high-arsenic copper concentrate and arsenic concentration II tailings, wherein the arsenic concentration II tailings are returned to the arsenic concentration I operation;

[0123] (5) adding 800 g / t of activator (the mass ratio of ethylenediaminetetraacetic acid to ammonium carbamate is 1:3), 30 g / t of dibutyl ammonium phosphate and 20 g / t of pine oil to the roughing II tailings obtained in step (2) in sequence, with an interval of 5 min for adding the agents, stirring for 5 min, and then performing copper roughing to obtain a copper roughing concentrate and a copper roughing tailings;

[0124] (6) adding 400 g / t of activator (the mass ratio of ethylenediaminetetraacetic acid to ammonium carbamate is 1:3), 15 g / t of dibutyl ammonium phosphate and 10 g / t of pine oil to the copper rougher tailings obtained in step (5) in sequence, with an interval of 5 min for adding the agents, stirring for 5 min for copper scavenging, and obtaining copper scavenging concentrate and copper scavenging tailings;

[0125] (7) performing copper concentration I on the copper roughing concentrate obtained in step (5) to obtain copper concentration I concentrate and copper concentration I tailings, wherein the copper concentration I tailings and the copper scavenging concentrate obtained in step (6) are combined and returned to the copper roughing operation;

[0126] (8) performing copper concentration II on the copper concentration I concentrate obtained in step (7) to obtain copper concentration II concentrate and copper concentration II tailings, wherein the copper concentration II tailings are returned to the copper concentration I operation;

[0127] (9) The copper concentrate II concentrate obtained in step (8) is subjected to copper concentrate III to obtain low-arsenic copper concentrate and copper concentrate III tailings, wherein the copper concentrate III tailings are returned to the copper concentrate II operation.

[0128] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 30.65%, the arsenic content is 0.48%, and the copper recovery rate is 78.22%; the copper grade of the high-arsenic copper concentrate is 11.32%, the arsenic content is 13.22%, and the copper recovery rate is 17.52%.

[0129] Comparative Example 7

[0130] The raw ore is sorted using the traditional reagent system and method, that is, an equal mass of sodium hypochlorite is used to replace hydrogen peroxide, an equal mass of sodium humate is used to replace sodium sulfite and added before butyl xanthate, and an equal mass of butyl xanthate is used to replace dibutyl ammonium phosphate in the flotation copper roughing and scavenging operations.

[0131] The final selection indicators obtained were: the copper grade of the low-arsenic copper concentrate was 26.33%, the arsenic content was 0.97%, and the copper recovery rate was 73.52%; the copper grade of the high-arsenic copper concentrate was 12.42%, the arsenic content was 11.52%, and the copper recovery rate was 14.28%.

[0132] It can be seen from Example 3 and Comparative Example 7 that by changing the type of oxidant, the type and order of addition of the inhibitor, and the type of collector, the sorting index of the ore decreases significantly. Compared with hydrogen peroxide, sodium hypochlorite is not selective enough to inhibit the surface oxidation of thiocarbide and chalcopyrite, which easily causes the two minerals to be contained in the copper concentrate. Sodium humate is an organic compound, which has a strong inhibitory effect but poor selectivity. In addition, compared with butyl xanthate, dibutyl ammonium phosphate has a stronger chelating property on the surface of chalcopyrite and can strongly capture chalcopyrite. Therefore, compared with the traditional reagent system and method, the present invention has better technical effects in sorting chalcopyrite and thiocarbide.

[0133] Comparative Example 8

[0134] The other conditions are the same as those in Example 3, except that in the copper float roughing and scavenging operations, an equal mass of EDTA is used instead of ammonium carbamate, that is, ammonium carbamate is not added, and the effect of single EDTA is analyzed.

[0135] The final separation indicators obtained were: the copper grade of the low-arsenic copper concentrate was 27.25%, the arsenic content was 0.46%, and the copper recovery rate was 72.87%; the copper grade of the high-arsenic copper concentrate was 11.08%, the arsenic content was 12.42%, and the copper recovery rate was 17.56%.

[0136] It can be seen from Example 3 and Comparative Example 8 that when ammonium carbamate is not added, the copper grade in the low-arsenic copper concentrate decreases by about 3% and the copper recovery rate decreases by about 6%. The reason is that ammonium carbamate can react with the copper active particles on the surface of chalcopyrite to generate copper-ammine complex cations, which promote the adsorption of the collector, while the activation ability of single ethylenediaminetetraacetic acid is limited.

[0137] Comparative Example 9

[0138] The other conditions are the same as those in Example 3, except that in the copper roughing and scavenging operations, an equal mass of ammonium carbamate is used instead of EDTA, that is, EDTA is not added, and the effect of single ammonium carbamate is analyzed.

[0139] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 26.85%, the arsenic content is 0.48%, and the copper recovery rate is 71.12%; the copper grade of the high-arsenic copper concentrate is 11.42%, the arsenic content is 13.12%, and the copper recovery rate is 17.06%.

[0140] It can be seen from Example 3 and Comparative Example 9 that when EDTA is not added, the copper grade in the low-arsenic copper concentrate is reduced by about 4%, and the copper recovery rate is reduced by about 7%. The reason is that EDTA can effectively complex the hydrophilic species (such as calcium hydroxyl, sulfate, hydroxyl compound, copper oxide, etc.) on the surface of chalcopyrite to achieve de-inhibition activation of the passivated chalcopyrite surface, but the activation ability of a single ammonium carbamate is limited.

[0141] Comparative Example 10

[0142] The other conditions were the same as those in Example 3, except that an equal amount of butyl xanthate was used to replace dibutyl ammonium phosphate in the copper roughing and copper scavenging operations.

[0143] The final selection indicators are as follows: the copper grade of the low-arsenic copper concentrate is 27.32%, the arsenic content is 0.46%, and the copper recovery rate is 73.13%; the copper grade of the high-arsenic copper concentrate is 11.55%, the arsenic content is 12.85%, and the copper recovery rate is 17.38%.

[0144] It can be seen from Example 3 and Comparative Example 10 that after butyl xanthate replaced dibutyl ammonium phosphate, the copper grade in the low-arsenic copper concentrate decreased by about 3%, and the copper recovery rate decreased by about 5 percentage points. The reason is that the dibutyl ammonium phosphate used in the present invention can coordinate with the copper active particles on the surface of chalcopyrite through PO-Cu and P=O-Cu to form a stable four-membered chelate ring, which can strongly capture chalcopyrite.

[0145] In summary, it can be seen that the present invention realizes the selective flotation separation of chalcopyrite and sulfur arsenic copper through the combination of "hydrogen peroxide oxidation modification-sodium sulfite desorption collector", and the activator (a mixture of ethylenediaminetetraacetic acid and ammonium carbamate) can effectively de-inhibit and activate chalcopyrite; on this basis, dibutyl ammonium phosphate strengthens the collection of chalcopyrite. The results of Example 1 and Comparative Example 1, Example 2 and Comparative Example 4, Example 3 and Comparative Example 7 show that compared with the traditional flotation reagent system and method, the present invention can increase the copper grade of low-arsenic copper concentrate by 2-4%, wherein the arsenic content is <0.5%, the copper recovery rate is increased by 4-5%, and the total copper recovery rate is increased by 5-9%. The combined use of hydrogen peroxide and sodium sulfite exerts a strong positive synergistic effect and can achieve the selective inhibition of chalcopyrite. The results of Example 1, Comparative Example 2 and Comparative Example 3 show that when no hydrogen peroxide is added, the copper grade of low-arsenic copper concentrate decreases by about 2 percentage points, the arsenic content increases from 0.32% to 0.68%, the total copper recovery rate decreases by about 7.7%, and the indicators of high-arsenic copper concentrate also decrease. When no sodium sulfite is added, the copper grade of low-arsenic copper concentrate decreases by about 1 percentage point, the arsenic content increases from 0.32% to 0.62%, and the total copper recovery rate decreases by about 10%. The activator plays an important positive role in the enrichment of chalcopyrite. The results of Example 2 and Comparative Example 5 show that when no activator is added, the copper grade of low-arsenic copper concentrate decreases by about 4.5 percentage points, and the copper recovery rate decreases by about 10%. The results of Example 3, Comparative Example 8 and Comparative Example 9 show that under the activation of single ethylenediaminetetraacetic acid or ammonium carbamate, the copper grade of low-arsenic copper concentrate decreases by 3-4 percentage points, and the copper recovery rate decreases by about 6-7%. Dibutyl ammonium phosphate has a good selective capture effect on chalcopyrite. The results of Example 2 and Comparative Example 6, Example 3 and Comparative Example 10 show that compared with traditional collectors (ethylthiocarbamate, butyl xanthate), the copper grade of low-arsenic copper concentrate decreased by 2.31% (Comparative Example 6) and 3.33% (Comparative Example 10), and the copper recovery rate decreased by 4.19% (Comparative Example 6) and 5.09% (Comparative Example 10). The results of Examples 1 to 3 confirm that the present invention has good adaptability to the separation of arsenic sulfide ores, the copper grade of low-arsenic copper concentrate is greater than 23%, the arsenic content is less than 0.5%, the arsenic content in high-arsenic copper concentrate is greater than 8%, and the total copper recovery rate is greater than 90%, achieving effective separation and enrichment of chalcopyrite and arsenic sulfide copper ore.

[0146] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for flotation separation and enrichment of chalcopyrite and arsenic copper ore, characterized in that: Lime and hydrogen peroxide are added during the grinding process of the raw ore, and then a collector, an inhibitor and a frother are added. A process of two roughing selections and two fine selections is used to suppress copper and float arsenic to obtain high-arsenic copper concentrate and copper-containing tailings. An activator, a high-efficiency collector and a frother are added to the copper-containing tailings, and a process of one roughing selection, one scavenging selection and three fine selections is used to select copper to obtain low-arsenic copper concentrate and tailings.

2. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 1, characterized in that: The following steps are involved: (1) adding lime and hydrogen peroxide to the raw ore grinding process to obtain a ground material, and sequentially adding a collector, a chalcopyrite inhibitor and a frother to the ground material to perform a roughing I for suppressing copper and floating arsenic, thereby obtaining a roughing I concentrate and a roughing I tailings; (2) adding hydrogen peroxide, a collector, a chalcopyrite inhibitor and a frother to the roughing I tailings in sequence, and performing roughing II for suppressing copper and floating arsenic, to obtain a roughing II concentrate and a roughing II tailings; (3) combining the rougher I concentrate and the rougher II concentrate to perform arsenic concentration I to obtain arsenic concentration I concentrate and arsenic concentration I tailings, wherein the arsenic concentration I tailings are returned to the rougher I operation for suppressing copper and arsenic flotation; (4) performing arsenic concentration II on the arsenic concentration I concentrate to obtain high-arsenic copper concentrate and arsenic concentration II tailings, wherein the arsenic concentration II tailings are returned to the arsenic concentration I operation; (5) adding an activator, a high-efficiency collector and a frother in sequence to the roughing II tailings to perform copper roughing to obtain a copper roughing concentrate and a copper roughing tailings; (6) adding an activator, a high-efficiency collector and a frother to the copper roughing tailings in sequence to perform copper scavenging to obtain a copper scavenging concentrate and a copper scavenging tailings; (7) performing copper concentration I on the copper roughing concentrate to obtain copper concentration I concentrate and copper concentration I tailings, wherein the copper concentration I tailings and the copper scavenging concentrate are combined and returned to the copper roughing operation; (8) performing copper concentration II on the copper concentration I concentrate to obtain copper concentration II concentrate and copper concentration II tailings, wherein the copper concentration II tailings are returned to the copper concentration I operation; (9) The copper concentrate II concentrate is subjected to copper concentrate III to obtain low-arsenic copper concentrate and copper concentrate III tailings, wherein the copper concentrate III tailings are returned to the copper concentrate II operation.

3. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 2, characterized in that: In step (1), the non-arsenic-containing copper sulfide minerals in the raw ore are mainly chalcopyrite, and the arsenic-containing minerals are mainly arsenic-sulfur copper ore; and / or The collector is butyl xanthate; and / or The inhibitor of chalcopyrite is sodium sulfite; and / or The foaming agent is pine oil; and / or The grinding is carried out in a ball mill until the fineness of the material discharged from the ball mill is -0.074 mm, accounting for 85-95 wt%.

4. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 3, characterized in that: In step (1), based on the raw ore, the amount of lime added is 800-1200 g / t; the amount of hydrogen peroxide added is 800-1000 g / t; the amount of collector added is 20-40 g / t; the amount of chalcopyrite inhibitor added is 600-800 g / t; and the amount of foaming agent added is 10-20 g / t.

5. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 2, characterized in that: In step (2), the collector is butyl xanthate; and / or The inhibitor of chalcopyrite is sodium sulfite; and / or The foaming agent is pine oil.

6. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 5, characterized in that: In step (2), based on the raw ore, the amount of hydrogen peroxide added is 400-500 g / t, the amount of collector added is 10-20 g / t, the amount of chalcopyrite inhibitor added is 300-400 g / t, and the amount of foaming agent added is 5-10 g / t.

7. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 2, characterized in that: In step (5), the activator is a mixture of ethylenediaminetetraacetic acid and ammonium carbamate in a mass ratio of 1:(1-3); and / or The efficient collector is dibutyl phosphate ammonium salt; and / or The foaming agent is pine oil.

8. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 7, characterized in that: In step (5), based on the raw ore, the added amount of the activator is 400-800 g / t, the added amount of the high-efficiency collector is 10-30 g / t, and the added amount of the foaming agent is 10-20 g / t.

9. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 1, characterized in that: In step (6), the activator is a mixture of ethylenediaminetetraacetic acid and ammonium carbamate in a mass ratio of 1:(1-3); and / or The efficient collector is dibutyl phosphate ammonium salt; and / or The foaming agent is pine oil.

10. The method for flotation separation and enrichment of chalcopyrite and arsenic copper ore according to claim 9, characterized in that: In step (6), based on the raw ore, the added amount of the activator is 200-400 g / t, the added amount of the high-efficiency collector is 5-15 g / t, and the added amount of the foaming agent is 5-10 g / t.

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