A method for separating copper and sulfur in a low-copper and high-sulfur slurry system

Abstract

The present invention discloses a method for separating copper and sulfur from a low-copper, high-sulfur slurry system. Specifically, the method comprises the following steps: The raw ore is ground in a ball mill and classified in a cyclone, and the qualified product is fed to a flotation process. After two roughing operations and one scavenging operation, two coarse concentrates and a first-stage tailings are obtained. The first coarse concentrate is refined by a flotation column to obtain a first-stage copper concentrate. The flotation column tailings undergo a third roughing operation and a first scavenging operation to obtain a first-stage, second-stage tailings. The second coarse concentrate is pre-classified, and the overflow is fed to a third roughing operation, where the sediment is fed to a ball mill for regrinding. The regrinded product is inspected and classified, and the overflow undergoes a fourth roughing operation, two more refinements, and a first scavenging operation to obtain a second-stage copper concentrate. The scavenged tailings are classified in a cyclone to obtain a sulfur concentrate and tailings. This method, specifically for a low-copper, high-sulfur flotation slurry system, utilizes a composite collector and depressant, achieving a copper recovery rate exceeding 85% and a sulfur recovery rate exceeding 60%, achieving efficient separation of copper and sulfur minerals in a low-copper, high-sulfur flotation system.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, and in particular to a method for separating copper and sulfur in a low-copper, high-sulfur slurry system. Background Art

[0002] Copper, a key industrial metal, plays an indispensable role in socioeconomic development due to its excellent ductility, electrical conductivity, and thermal conductivity. With the growing demand for copper, copper mining has increased annually. The recovery of low-grade, complex, and associated porphyry copper deposits has become increasingly important.

[0003] Low-grade, complex copper ores contain low copper grades and high levels of associated pyrite, with copper-to-sulfur ratios as high as 20 times. Flotation of low-grade copper ores generally faces the problem of separating low copper from high sulfur. Currently, large amounts of lime are used as a pyrite flotation depressant in low-grade copper ores, sometimes as high as 20 kg / t. This high use of lime results in high calcium ion content in the return water, increasing treatment costs and causing severe pipeline corrosion. Furthermore, the high alkalinity of the slurry created by the high use of lime easily suppresses associated metals such as molybdenum and rhenium. Low-alkali copper and sulfur separation remains a persistent challenge for the nonferrous metals industry.

[0004] In view of this, this invention is proposed. Summary of the Invention

[0005] The object of the present invention is to provide a copper-sulfur separation method in a low-copper, high-sulfur ore pulp system. Based on a new pyrite flotation depressant, the amount of lime used in the copper-sulfur separation process is reduced, and the recovery rate of valuable metals in the low-copper, high-sulfur ore is improved.

[0006] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0007] The present invention provides a method for separating copper and sulfur from a low-copper, high-sulfur slurry system, comprising the following steps:

[0008] S1. The raw ore is fed into a ball mill for grinding to obtain ground material. The ground material is fed into a cyclone for classification. The overflow of the cyclone is fed into the subsequent flotation process, and the underflow of the cyclone is returned to the ball mill for re-grinding.

[0009] The particle size of the abrasive material is 0.074 mm, accounting for 15 wt% to 20 wt%, and the cyclone pressure is 0.35 kg / cm 2 ~0.69kg / cm 2 , -0.074mm particles account for 65%-72% of the cyclone overflow;

[0010] S2, mixing the cyclone overflow in S1 with a depressant, a collector and a frother, and feeding the mixture into a flotation machine for a first roughing operation; feeding the first roughing concentrate into a flotation column for a rapid concentration operation; the column flotation concentrate is a first-stage copper concentrate; feeding the column flotation tailings into a third roughing operation to obtain third roughing tailings and a roughing concentrate; mixing the third roughing tailings with a collector and feeding them into a second scavenging operation; the second scavenging concentrate returns to the third roughing operation; the second scavenging tailings are the first-stage two-stage tailings;

[0011] Wherein, the main component of the collector is ethylthiocarbamate;

[0012] Wherein, the inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in the ratio of 10-15:5-10:1-5;

[0013] In S3, the tailings from the first roughing operation are mixed with a collector and fed to the second roughing operation. The tailings from the second roughing operation are added with a collector and fed to a flotation machine for the first scavenging operation. The concentrate from the first scavenging operation is returned to the second roughing operation. The tailings from the first scavenging operation are the final tailings. The concentrate from the second roughing operation is fed to a pre-selection cyclone for classification. The overflow product is fed to the roughing operation in S2, and the grit product is fed to a ball mill for regrinding.

[0014] Wherein, the collector is sodium n-butyl xanthate;

[0015] Wherein, the inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in the ratio of 10-15:5-10:1-5;

[0016] S4, feeding the regrinded product in S3 to an inspection and classification operation, feeding the gritted material to a ball mill for regrinding, feeding the overflow material to a flotation machine after slurry preparation, and performing a fourth roughing operation after adding an inhibitor, a collector and a frother. The fourth roughing concentrate is fed to a flotation column for a second concentration operation, and the concentrate from the second concentration operation is fed to a third concentration operation to obtain a two-step copper concentrate. The tailings from the third concentration operation are returned to the second concentration operation, and the tailings from the second concentration operation are returned to the inspection and classification operation; the tailings from the fourth roughing operation are fed to a flotation machine for scavenging operation, and the scavenged concentrate is returned to the fourth roughing operation. The scavenged tailings are fed to a tailing cyclone for tailing scavenging and classification. The cyclone overflow is the tailings, and the cyclone underflow is the sulfur concentrate.

[0017] Wherein, the collector is sodium n-butyl xanthate;

[0018] Wherein, the inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in the ratio of 10-15:5-10:1-5;

[0019] In step S1, the grinding concentration is 75% to 80%, and the medium filling rate is 30% to 35%.

[0020] The step S2 should include the following steps:

[0021] (1) The first roughing process includes: slurrying the ground material, adding lime to adjust the pH to 7-8, and using an inhibitor in an amount ranging from 5 to 25 g / t, a collector in an amount ranging from 12 to 15 g / t, and a foaming agent in an amount ranging from 8 to 13 g / t.

[0022] (2) The flotation column rapid selection operation includes: the flotation column inflation volume and the collector dosage range are 12~15g / t.

[0023] (3) The flotation column tailings are fed into the third roughing operation, and the amount of collector used in the third roughing operation ranges from 40 to 50 g / t.

[0024] (4) The dosage of the collector in the second sweeping operation ranges from 40 to 50 g / t.

[0025] The step S3 should include the following steps:

[0026] (1) The second roughing process includes: the inhibitor dosage range is 5-25 g / t, the collector dosage range is 40-50 g / t, and the foaming agent dosage range is 8-13 g / t.

[0027] (2) The first sweep includes: the amount of collector used is in the range of 6~10g / t.

[0028] (3) The pre-classification cyclone is ∮380, the diameter of the sand settling mouth is 55mm, the diameter of the overflow pipe is 140mm, and the cyclone pressure is 0.3-0.5kg / cm 2 .

[0029] In step S4, the second stage grinding process includes: a grinding concentration of 40% to 50% and a medium filling rate of 20% to 30%.

[0030] In step S4, the inspection classification cyclone is ∮380, the diameter of the sand settling mouth is 55mm, the diameter of the overflow pipe is 140mm, and the cyclone pressure is 0.3-0.5kg / cm 2 .

[0031] In the step S4, during the fourth roughing process, the amount of the inhibitor added is 5-12.5 g / t, and the amount of the collector added is 6-10 g / t.

[0032] In step S4, during the second concentration process, the amount of inhibitor added is 5-12.5 g / t, and during the third concentration process, the amount of inhibitor added is 5-12.5 g / t.

[0033] In the step S4, during the third sweeping process, the amount of the collector added is 6-10 g / t.

[0034] In step S4, the pressure of the tail cyclone is 0.3-0.5 kg / cm 2 .

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention provides a method for separating copper and sulfur in a low-copper, high-sulfur slurry system. A new type of pyrite flotation depressant is developed, and a cascaded application of depressants is used to achieve efficient separation of copper and sulfur. The copper recovery rate reaches 88%, and the sulfur recovery rate reaches 60%.

[0037] The novel pyrite flotation depressant provided by the present invention can coordinate with metal atoms on the surface of pyrite in a directional manner through carboxyl groups and amino groups, has high selectivity and a wide range of sources, reduces the amount of lime used by more than 90%, and improves the recovery rate of valuable metals. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention is a flowchart of a method for separating copper and sulfur in a low-copper, high-sulfur slurry system. DETAILED DESCRIPTION

[0039] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work premise belong to the scope of protection of the present invention. Those who do not specify specific conditions in the embodiments are carried out according to normal conditions or the conditions recommended by the manufacturer. Those whose reagents or instruments are not specified by the manufacturer are conventional products that can be purchased commercially.

[0040] Example 1

[0041] like Figure 1 As shown, this embodiment provides a method for separating copper and sulfur in a low-copper, high-sulfur slurry system, comprising the following steps:

[0042] S1. The raw ore is fed into a ball mill for grinding to obtain ground material. The ground material is fed into a cyclone for classification. The overflow of the cyclone is fed into the subsequent flotation process, and the underflow of the cyclone is returned to the ball mill for re-grinding.

[0043] The particle size of the abrasive material is -0.074 mm, accounting for 15 wt%, and the cyclone pressure is 0.35 kg / cm 2 , -0.074mm particles account for 65% of the cyclone overflow, the grinding concentration is 75%, and the medium filling rate is 30%.

[0044] S2: The cyclone overflow from S1 is adjusted to a pH of 7 by adding lime. The mixture is then mixed with a depressant, a collector, and a frother before being fed to a flotation cell for the first roughing operation. The roughing depressant is a mixture of disodium carboxymethyl trithiocarbonate, fenugreek gum, and polyglutamic acid in a ratio of 10:7:1, with a dosage of 25 g / t. The collector, ethylthiocarbamate, is used in an amount of 15 g / t, and the frother is used in an amount of 13 g / t. The first roughing concentrate is fed to a flotation column for rapid concentration, with a collector dosage of 15 g / t. The column flotation concentrate is the single-stage copper concentrate. The column flotation tailings are fed to the third roughing operation, with a collector dosage of 40 g / t. The third roughing tailings and the roughing concentrate are then mixed with a collector and fed to the second scavenging operation, with a collector dosage of 45 g / t. The concentrate from the second scavenging is returned to the third roughing operation, and the tailings from the second scavenging are the second stage tailings;

[0045] S3, the first roughing tailings are mixed with an inhibitor and a collector and then fed into the second roughing operation. The roughing inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum, and polyglutamic acid in a ratio of 10:7:1, with a dosage of 18g / t. The dosage of sodium n-butyl xanthate, the collector, is 40g / t, and the dosage of the frother is 10g / t. The tailings from the second roughing operation are fed into a flotation machine after adding a collector for the first scavenging operation. The dosage of sodium n-butyl xanthate, the collector, is 10g / t. The concentrate from the first scavenging operation is returned to the second roughing operation. The tailings from the first scavenging operation are the final tailings. The concentrate from the second roughing operation is fed into a cyclone for classification. The overflow product is fed into the roughing operation in S2, and the settled sand is fed into a ball mill for regrinding.

[0046] S4: Feed the reground product from S3 into the inspection and classification process. The inspection cyclone is ∮380, the diameter of the sand settling nozzle is 55mm, the diameter of the overflow pipe is 140mm, and the cyclone pressure is 0.3kg / cm 2 The material on the screen is fed into the ball mill for regrinding, with a grinding concentration of 50% and a medium filling rate of 30%.

[0047] The undersize material is fed into the flotation machine after slurry adjustment, and the fourth roughing operation is carried out after adding inhibitors, collectors and frothers. The amount of inhibitor added is 12.5g / t, and the amount of collector added is 10g / t. The fourth roughing concentrate is fed into the flotation column for the second selection operation. The concentrate of the second selection operation is fed into the third selection operation to obtain a two-step copper concentrate. The tailings of the third selection operation are returned to the second selection operation. During the second selection process, the amount of inhibitor added is 12.5g / t, and the amount of inhibitor added in the third selection operation is 5g / t. The tailings of the second selection operation are returned to the inspection and classification operation; the tailings of the fourth roughing operation are fed into the flotation machine for scavenging operation. During the third scavenging process, the amount of collector added is 10g / t. The scavenged concentrate is returned to the fourth roughing operation, and the scavenged tailings are fed into the tailing cyclone for classification treatment. The pressure of the tailing cyclone is 0.5kg / cm 2 The cyclone overflow is the tailings, and the cyclone underflow is the sulfur concentrate;

[0048] Example 2

[0049] This embodiment provides a method for separating copper and sulfur from a low-copper, high-sulfur slurry system, comprising the following steps:

[0050] S1. The raw ore is fed into a ball mill for grinding to obtain ground material. The ground material is fed into a cyclone for classification. The overflow of the cyclone is fed into the subsequent flotation process, and the underflow of the cyclone is returned to the ball mill for re-grinding.

[0051] The particle size of the abrasive material is -0.074 mm, accounting for 18 wt%, and the cyclone pressure is 0.40 kg / cm 2 , -0.074mm particles account for 72% of the cyclone overflow, the grinding concentration is 80%, and the medium filling rate is 32%.

[0052] S2: The cyclone overflow from S1 is adjusted to a pH of 8 by adding lime. The mixture is then mixed with a depressant, a collector, and a frother before being fed to a flotation machine for the first roughing operation. The roughing depressant is a mixture of disodium carboxymethyl trithiocarbonate, fenugreek gum, and polyglutamic acid in a ratio of 12:10:3, with a dosage of 20 g / t. The collector, ethylthiocarbamate, is used in an amount of 12 g / t, and the frother is used in an amount of 8 g / t. The first roughing concentrate is fed to a flotation column for rapid concentration, with a collector dosage of 15 g / t. The column flotation concentrate is the single-stage copper concentrate. The column flotation tailings are fed to the third roughing operation, with a collector dosage of 42 g / t. The third roughing tailings and the roughing concentrate are then mixed with a collector and fed to the second scavenging operation, with a collector dosage of 44 g / t. The concentrate from the second scavenging is returned to the third roughing operation, and the tailings from the second scavenging are the second stage tailings;

[0053] S3, the first roughing tailings are mixed with an inhibitor and a collector and then fed into the second roughing operation. The roughing inhibitor is a mixture of disodium carboxymethyl trithiocarbonate, fenugreek gum, and polyglutamic acid in a ratio of 10:7:1, with a dosage of 20g / t. The dosage of sodium n-butyl xanthate, the collector, is 42g / t, and the dosage of the frother is 10g / t. The tailings from the second roughing operation are fed into a flotation machine after adding a collector for the first scavenging operation. The dosage of sodium n-butyl xanthate, the collector, is 8g / t. The concentrate from the first scavenging operation is returned to the second roughing operation. The tailings from the first scavenging operation are the final tailings. The concentrate from the second roughing operation is fed into a cyclone for classification. The overflow product is fed into the roughing operation in S2, and the settled sand is fed into a ball mill for regrinding.

[0054] S4: Feed the reground product in S3 into the inspection and classification process. The inspection cyclone is ∮380, the diameter of the sand settling nozzle is 55mm, the diameter of the overflow pipe is 140mm, and the cyclone pressure is 0.35kg / cm 2 Check the sand settling material in the grading cyclone and feed it into the ball mill for regrinding. The grinding concentration is 48% and the medium filling rate is 28%.

[0055] The overflow material of the inspection and classification cyclone is fed into the flotation machine after slurry adjustment. After adding inhibitors, collectors and frothers, the fourth roughing operation is carried out. The amount of inhibitor added is 8g / t, and the amount of collector added is 8g / t. The fourth roughing concentrate is fed into the flotation column for the second selection operation. The concentrate of the second selection operation is fed into the third selection operation to obtain a two-step copper concentrate. The tailings of the third selection operation are returned to the second selection operation. During the second selection process, the amount of inhibitor added is 10g / t, and the amount of inhibitor added in the third selection operation is 8g / t. The tailings of the second selection operation are returned to the inspection and classification operation; the tailings of the fourth roughing operation are fed into the flotation machine for scavenging operation. During the third scavenging process, the amount of collector added is 7g / t. The scavenged concentrate is returned to the fourth roughing operation, and the scavenged tailings are fed into the tailing cyclone for classification treatment. The pressure of the tailing cyclone is 0.4kg / cm 2 The cyclone overflow is the tailings, and the cyclone underflow is the sulfur concentrate;

[0056] Example 3

[0057] This embodiment provides a method for separating copper and sulfur from a low-copper, high-sulfur slurry system, comprising the following steps:

[0058] S1. The raw ore is fed into a ball mill for grinding to obtain ground material. The ground material is fed into a cyclone for classification. The overflow of the cyclone is fed into the subsequent flotation process, and the underflow of the cyclone is returned to the ball mill for re-grinding.

[0059] The particle size of the abrasive material is -0.074 mm, accounting for 20 wt%, and the cyclone pressure is 0.60 kg / cm 2 , -0.074mm particles account for 70% of the cyclone overflow, the grinding concentration is 77%, and the medium filling rate is 35%.

[0060] S2: The cyclone overflow from S1 is adjusted to a pH of 8 by adding lime. The mixture is then mixed with a depressant, a collector, and a frother before being fed to a flotation cell for the first roughing operation. The roughing depressant is a mixture of disodium carboxymethyl trithiocarbonate, fenugreek gum, and polyglutamic acid in a ratio of 15:10:1, with a dosage of 18 g / t. The collector is ethylthiocarbamate, with a dosage of 15 g / t, and a frother, with a dosage of 10 g / t. The first roughing concentrate is fed to a flotation column for rapid concentration, with a collector dosage of 12 g / t. The column flotation concentrate is the single-stage copper concentrate. The column flotation tailings are fed to the third roughing operation, with a collector dosage of 43 g / t. The third roughing tailings and the roughing concentrate are then mixed with a collector and fed to the second scavenging operation, with a collector dosage of 50 g / t. The concentrate from the second scavenging is returned to the third roughing operation, and the tailings from the second scavenging are the second stage tailings;

[0061] S3, the first roughing tailings are mixed with an inhibitor and a collector and then fed into the second roughing operation. The roughing inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum, and polyglutamic acid in a ratio of 15:10:1, with a dosage of 18g / t. The dosage of sodium n-butyl xanthate is 40g / t, and the dosage of the frother is 8g / t. The tailings from the second roughing operation are fed into the flotation machine after adding the collector for the first scavenging operation. The dosage of sodium n-butyl xanthate is 9g / t. The concentrate from the first scavenging operation is returned to the second roughing operation. The tailings from the first scavenging operation are the final tailings. The concentrate from the second roughing operation is fed into a cyclone for classification. The overflow product is fed into the roughing operation in S2, and the settled sand is fed into a ball mill for regrinding.

[0062] S4: Feed the reground product from S3 into the inspection and classification process. The inspection cyclone is ∮380, the diameter of the sand settling nozzle is 55mm, the diameter of the overflow pipe is 140mm, and the cyclone pressure is 0.5kg / cm 2 Check the sand settling material in the grading cyclone and feed it into the ball mill for regrinding. The grinding concentration is 50% and the medium filling rate is 30%.

[0063] After slurry adjustment, the material from the inspection and grading cyclone is fed into the flotation machine. After adding inhibitors, collectors and frothers, the fourth roughing operation is carried out. The amount of inhibitor added is 12g / t, and the amount of collector added is 6g / t. The concentrate from the fourth roughing operation is fed into the flotation column for the second selection operation. The concentrate from the second selection operation is fed into the third selection operation to obtain a two-step copper concentrate. The tailings from the third selection operation are returned to the second selection operation. During the second selection process, the amount of inhibitor added is 12.5g / t, and the amount of inhibitor added in the third selection process is 10g / t. The tailings from the second selection operation are returned to the inspection and grading operation; the tailings from the fourth roughing operation are fed into the flotation machine for scavenging operation. During the third scavenging process, the amount of collector added is 7g / t. The scavenged concentrate is returned to the fourth roughing operation, and the scavenged tailings are fed into the cyclone for grading treatment. The pressure of the cyclone is 0.5kg / cm 2 The cyclone overflow is the tailings, and the cyclone underflow is the sulfur concentrate;

[0064] Comparative Example 1

[0065] The copper-sulfur separation method for a low-copper, high-sulfur slurry system provided in this comparative example refers to Example 1, with the only difference being that in steps S2 and S3, the pyrite inhibitor is lime.

[0066] Comparative Example 2

[0067] The copper-sulfur separation method for a low-copper, high-sulfur slurry system provided in this comparative example refers to Example 1, except that, in steps S2 and S3, the pyrite inhibitor is disodium carboxymethyl trithiocarbonate.

[0068] Comparative Example 3

[0069] The copper-sulfur separation method for a low-copper, high-sulfur slurry system provided in this comparative example refers to Example 1, except that in steps S2 and S3, the pyrite inhibitor is fenugreek gum.

[0070] Comparative Example 4

[0071] The copper-sulfur separation method of the low-copper, high-sulfur slurry system provided in this comparative example refers to Example 1, with the only difference being that, in steps S2 and S3, the pyrite inhibitor is polyglutamic acid.

[0072] Test Example 1

[0073] In the copper-sulfur separation method of the low-copper, high-sulfur slurry system in Examples 1 to 3 and Comparative Examples 1 to 4, the copper recovery rate and average grade are shown in Table 1.

[0074] Table 1

[0075] .

[0076] The above describes in detail a method for separating copper and sulfur from a low-copper, high-sulfur slurry system provided in the examples of this application. The description of the above examples is intended only to facilitate understanding of the method and core concept of this application. Furthermore, those skilled in the art will appreciate that variations in the specific implementation and scope of application may occur based on the concepts of this application. In summary, this specification should not be construed as limiting this application.

[0077] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" and "comprising" mentioned throughout the specification and claims are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problems within a certain error range and basically achieve the technical effects. The subsequent description in the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be as defined in the attached claims.

[0078] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0079] The above description shows and describes several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present application can be used in various other combinations, modifications, and environments and can be modified within the scope of the application concept described herein through the above teachings or technology or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present application should be protected by the claims appended hereto.

Claims

1. A method for separating copper and sulfur from a low-copper, high-sulfur slurry system, characterized in that The copper-sulfur separation method specifically comprises the following steps: S1) The raw ore is fed into a ball mill for grinding to obtain ground material, which is then fed into a cyclone for classification. The overflow from the cyclone is fed into a subsequent flotation process, and the underflow from the cyclone is returned to the ball mill for further grinding; S2) mixing the cyclone overflow obtained in S1) with a depressant, a collector, and a frother, and feeding the mixture into a flotation machine for a first roughing operation to obtain a first roughing concentrate and a first roughing tailing. The first roughing concentrate is fed into a flotation column for rapid concentration. The flotation column concentrate is a one-step copper concentrate. The tailings from the flotation column are fed into the third roughing operation to obtain the third roughing tailings and roughing concentrate. The third roughing tailings are mixed with a collector and fed into the second scavenging operation. The second scavenging concentrate is returned to the third roughing operation. The second scavenging tailings are the one-step two-stage tailings. In step S3, the first roughing tailings from step S2) are mixed with a collector and fed to the second roughing operation. The tailings from the second roughing operation are fed to a flotation cell after adding a collector for the first scavenging operation. The concentrate from the first scavenging operation is returned to the second roughing operation. The tailings from the first scavenging operation are the final tailings. The concentrate from the second roughing operation is fed to a hydrocyclone for pre-classification. The overflow product from the hydrocyclone is fed to the roughing operation in step S2. The grit product from the hydrocyclone is fed to a ball mill for regrinding. S4) feeding the regrinded product in S3 into a cyclone for inspection and classification, feeding the gritted material into a ball mill for regrinding, feeding the overflow material into a flotation machine after slurry preparation, and performing a fourth roughing operation after adding a depressant, a collector, and a frother. The fourth roughing concentrate is fed into a flotation column for a second concentration operation, and the concentrate from the second concentration operation is fed into a third concentration operation to obtain a two-step copper concentrate. The tailings from the third concentration operation are returned to the second concentration operation, and the tailings from the second concentration operation are returned to the inspection and classification operation; the tailings from the fourth roughing operation are fed into a flotation machine for scavenging operation, and the scavenged concentrate is returned to the fourth roughing operation. The scavenged tailings are fed into a tailings cyclone for tailings scavenging and classification. The cyclone overflow is the tailings, and the cyclone underflow is the sulfur concentrate. The collector S2) is ethylthiocarbamate; The collector in S3) and S4) is sodium n-butyl xanthate; The inhibitors all include disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid, and the fraction ratio among the three is 10-15:5-10:1-5.

2. The copper-sulfur separation method according to claim 1, wherein The raw ore in S1) has a copper grade of 0.20%-0.30% and a sulfur grade of 2%-5%; The grinding concentration is 75%~80%, and the medium filling rate is 30%~35%; The particle size of the abrasive material is 0.074 mm, accounting for 15 wt% to 20 wt%, and the cyclone pressure is 0.35 kg / cm 2 ~0.69kg / cm 2 , -0.074mm particles account for 65%-72% in the cyclone overflow.

3. The copper-sulfur separation method according to claim 1, characterized in that S2) The first roughing step includes: slurrying the ground material, adding lime to adjust the pH to 7-8, using an inhibitor in an amount of 5-25 g / t, a collector in an amount of 12-15 g / t, and a foaming agent in an amount of 8-13 g / t; The flotation column rapid selection operation includes: flotation column inflation volume 65-85m 3 / h, the collector dosage range is 12~15g / t; The flotation column tailings are fed into the third roughing operation, and the amount of collector used in the third roughing operation ranges from 40 to 50 g / t; The dosage of the collector in the second sweeping operation ranges from 40 to 50 g / t.

4. The copper-sulfur separation method according to claim 1, characterized in that S3) The second roughing includes: the inhibitor dosage range is 5-25g / t, the collector dosage range is 40-50g / t, and the foaming agent dosage range is 8-13g / t; The first sweeping includes: the amount of collector is in the range of 6-10 g / t; The pre-classification cyclone is ∮380, the diameter of the sand settling mouth is 55mm, the diameter of the overflow pipe is 140mm, and the cyclone pressure is 0.3-0.5kg / cm 2 .

5. The copper-sulfur separation method according to claim 1, characterized in that The second grinding process in S4) includes: grinding concentration of 40% to 50%, medium filling rate of 20% to 30%; The grading cyclone used for inspection and grading is ∮380, the diameter of the sand settling mouth is 55mm, the diameter of the overflow pipe is 140mm, and the cyclone pressure is 0.3-0.5kg / cm 2 .

6. The copper-sulfur separation method according to claim 1, characterized in that: In the fourth roughing process in S4), the amount of inhibitor added is 5-12.5 g / t, and the amount of collector added is 6-10 g / t.

7. The copper-sulfur separation method according to claim 1, characterized in that: The amount of inhibitor added during the second concentration in S4) is 5-12.5 g / t, and the amount of inhibitor added during the third concentration operation is 5-12.5 g / t.

8. The copper-sulfur separation method according to claim 1, characterized in that: The amount of collector added during the scavenging process in S4) is 6-10 g / t; The pressure of the tail cyclone is 0.3-0.5kg / cm 2 .

9. The copper-sulfur separation method according to claim 1, characterized in that: After treatment by the copper-sulfur separation method, the recovery rate of copper is not less than 85%, and the recovery rate of sulfur is not less than 60%.

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