Copper-sulfur separation method for low-copper high-sulfur ore pulp system

Abstract

The invention discloses a copper-sulfur separation method for a low-copper high-sulfur ore pulp system. The method specifically comprises the steps that raw ore is ground through a ball mill and classified through a cyclone, and then qualified products are fed for flotation operation; two rough concentrates and first-section tailings are obtained through two times of roughing and one time of scavenging, the first rough concentrate is subjected to flotation column concentration to obtain first-step copper concentrates, and flotation column tailings are subjected to third time of roughing and one time of scavenging operation to obtain first-step second-section tailings; the second rough concentrate is graded in advance, overflows and is fed into third roughing operation, and settled sand is fed into the ball mill to be ground again; and reground products are checked and graded, overflow is subjected to fourth-time roughing, two-time concentration and one-time scavenging operation, second-step copper concentrate is obtained, scavenging tailings are graded through a cyclone, and sulfur concentrate and tailings are obtained. According to the method, the composite collecting agent and the inhibitor are adopted for the low-copper and high-sulfur flotation pulp system, the recovery rate of copper reaches 85% or above, the recovery rate of sulfur reaches 60% or above, and efficient separation of copper-sulfur minerals of the low-copper and high-sulfur flotation system is achieved.

Description

Technical Field

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

[0002] Copper, as an important industrial metal, has an indispensable position in social and economic development due to its excellent ductility, electrical conductivity and thermal conductivity. With the increasing demand for copper, the amount of copper mined has increased year by year. The recovery of low-grade complex co-existing porphyry copper ores has become increasingly important.

[0003] The copper grade in low-grade complex copper ores is low, while the content of associated pyrite is high, with the copper-sulfur ratio even as high as 20 times. The flotation of low-grade copper ores generally faces the current situation of low-copper and high-sulfur separation. Currently, a large amount of lime is used as a pyrite flotation inhibitor in low-grade copper ores, even up to 20kg / t. The use of a large amount of lime leads to a high calcium ion content in the return water, high treatment costs, and severe pipeline corrosion. In addition, the high alkaline slurry environment caused by the use of a large amount of lime is susceptible to inhibition of associated metals such as molybdenum and rhenium. Copper-sulfur low-alkali separation has always been one of the problems plaguing the non-ferrous 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, which reduces the amount of lime used in the copper-sulfur separation process and improves the recovery rate of valuable metals in the low-copper, high-sulfur ore based on a new pyrite flotation inhibitor.

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

[0007] The present invention provides a method for separating copper and sulfur in a low-copper and 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, which is then fed into a hydrocyclone for classification. The hydrocyclone overflow is fed into subsequent flotation operations, and the hydrocyclone underflow 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 , the proportion of -0.074mm particles in the cyclone overflow is 65%-72%;

[0010] S2, mixing the cyclone overflow in S1 with the inhibitor, collector and frother, and then feeding it into the flotation machine for the first roughing operation, the first roughing concentrate is fed into the flotation column for rapid concentration operation, and the column flotation concentrate is the first-stage copper concentrate; the column flotation tailings are fed into the third roughing operation to obtain the third roughing tailings and roughing concentrate, the third roughing tailings are mixed with the collector and then fed into the second scavenging operation, the second scavenging concentrate is returned to the third roughing operation, and 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] S3, the first roughing tailings are mixed with the collector and fed to the second roughing operation. The tailings of the second roughing operation are added with the collector and fed to the flotation machine for the first scavenging operation. The concentrate of the first scavenging operation is returned to the second roughing operation. The tailings of the first scavenging operation are the final tailings. The concentrate of the second roughing operation is fed to the pre-selection and classification cyclone for classification. The overflow product is fed to the roughing operation in S2, and the sand settling product is fed to the ball mill for re-grinding.

[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 regrinding product in S3 to the inspection and classification operation, feeding the sand settling material to the ball mill for regrinding treatment, feeding the overflow material to the flotation machine after slurry adjustment, adding the inhibitor, collector and frother to carry out the fourth roughing operation, feeding the fourth roughing concentrate to the flotation column for the second concentration operation, feeding the second concentration concentrate to the third concentration operation to obtain the two-step copper concentrate, the third concentration tailings are returned to the second concentration operation, and the second concentration tailings are returned to the inspection and classification operation; the fourth roughing tailings are fed to the flotation machine for scavenging operation, the scavenging concentrate is returned to the fourth roughing operation, and the scavenging tailings are fed to the tailing cyclone for tailing scavenging classification treatment, 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 the 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 comprises: slurrying the ground material, adding lime to adjust the pH to 7-8, and then 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 frother in an amount ranging from 8 to 13 g / t.

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

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

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

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

[0026] (1) The second roughing 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 to 10 g / t.

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

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

[0030] In step S4, the inspection classification 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 0.3-0.5kg / 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 the step S4, during the second concentration process, the amount of inhibitor added is 5-12.5 g / t, and during the third concentration operation, 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 invention provides a method for separating copper and sulfur in a low-copper and high-sulfur slurry system, develops a new type of pyrite flotation inhibitor, and uses the inhibitor in a cascade manner, thereby achieving efficient separation of copper and sulfur, with a copper recovery rate of 88% and a sulfur recovery rate of 60%.

[0037] The novel pyrite flotation inhibitor provided by the invention can coordinate with metal atoms on the surface of pyrite through carboxyl and amino groups, has high selectivity and wide 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 appreciated 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, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all 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 and 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, which is then fed into a hydrocyclone for classification. The hydrocyclone overflow is fed into subsequent flotation operations, and the hydrocyclone underflow 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, after adding lime to the overflow of the cyclone in S1 to adjust the pH to 7, the mixture is mixed with an inhibitor, a collector and a frother and then fed to a flotation machine for the first roughing operation. The roughing inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in a ratio of 10:7:1, and the dosage range is 25g / t, the dosage range of the collector ethylthiocarbamate is 15g / t, and the dosage range of the frother is 13g / t. The first roughing concentrate is fed to the flotation column for rapid selection, and the dosage range of the collector is 15g / t. The column flotation concentrate is the one-step copper concentrate; the column flotation tailings are fed to the third roughing operation, and the dosage range of the collector in the third roughing operation is 40g / t. The third roughing tailings and roughing concentrate are obtained, and the third roughing tailings are mixed with a collector and fed to the second scavenging operation, and the dosage range of the collector in the second scavenging operation is 45g / 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 tailings of the first roughing operation are mixed with inhibitors and collectors and then fed to the second roughing operation. The roughing inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in the ratio of 10:7:1, and the dosage is 18g / t. The dosage of the collector sodium n-butyl xanthate is 40g / t, and the dosage of the frother is 10g / t. The tailings of the second roughing operation are added with collectors and fed into the flotation machine for the first scavenging operation. The dosage of the collector sodium n-butyl xanthate in the first scavenging operation is 10g / t. The concentrate of the first scavenging operation is returned to the second roughing operation. The tailings of the first scavenging operation are the final tailings. The concentrate of the second roughing operation is fed into the cyclone for classification. The overflow product is fed into the roughing operation in S2, and the sediment is fed into the ball mill for re-grinding;

[0046] S4, feed the reground product in S3 to the inspection and classification operation, check that the classification 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 material under the screen is fed into the flotation machine after slurry adjustment. After adding the inhibitor, collector and frother, the fourth roughing operation is carried out. The inhibitor is added in an amount of 12.5g / t, and the collector is added in an amount of 10g / t. The fourth roughing concentrate is fed into the flotation column for the second concentration operation. The concentrate of the second concentration operation is fed into the third concentration operation to obtain a two-step copper concentrate. The tailings of the third concentration operation are returned to the second concentration operation. During the second concentration process, the inhibitor is added in an amount of 12.5g / t, and the inhibitor is added in an amount of 5g / t in the third concentration operation. The tailings of the second concentration operation are returned for inspection and classification; the tailings of the fourth roughing operation are fed into the flotation machine for scavenging operation. During the third scavenging process, the collector is added in an amount of 10g / t. The scavenging concentrate is returned to the fourth roughing operation, and the scavenging 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 in a low-copper and 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, which is then fed into a hydrocyclone for classification. The hydrocyclone overflow is fed into subsequent flotation operations, and the hydrocyclone underflow 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 accounted for 72% of the cyclone overflow, the grinding concentration was 80%, and the medium filling rate was 32%.

[0052] S2, after adding lime to the overflow of the cyclone in S1 to adjust the pH to 8, the mixture is mixed with an inhibitor, a collector and a frother and then fed to a flotation machine for the first roughing operation. The roughing inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in a ratio of 12:10:3, with a dosage range of 20g / t, a collector ethylthiocarbamate dosage range of 12g / t, and a frother dosage range of 8g / t. The first roughing concentrate is fed to a flotation column for rapid selection, and the collector dosage range is 15g / t. The column flotation concentrate is a one-step copper concentrate; the column flotation tailings are fed to the third roughing operation, and the collector dosage range in the third roughing operation is 42g / t. The third roughing tailings and roughing concentrate are obtained, and the third roughing tailings are mixed with a collector and fed to the second scavenging operation, and the collector dosage range in the second scavenging operation is 44g / 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 tailings of the first roughing operation are mixed with inhibitors and collectors and then fed into the second roughing operation. The roughing inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in the ratio of 10:7:1, and the dosage is 20g / t. The dosage of the collector sodium n-butyl xanthate is 42g / t, and the dosage of the frother is in the range of 10g / t. The tailings of the second roughing operation are added with collectors and fed into the flotation machine for the first scavenging operation. The dosage of the collector sodium n-butyl xanthate in the first scavenging operation is 8g / t. The concentrate of the first scavenging operation is returned to the second roughing operation. The tailings of the first scavenging operation are the final tailings. The concentrate of the second roughing operation is fed into the cyclone for classification. The overflow product is fed into the roughing operation in S2, and the sediment is fed into the ball mill for re-grinding;

[0054] S4: Feed the reground product in S3 into the inspection and classification operation. The inspection classification 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 the inhibitor, collector and frother, the fourth roughing operation is carried out. The inhibitor added is 8g / t, and the collector added is 8g / t. The fourth roughing concentrate is fed into the flotation column for the second concentration operation. The concentrate of the second concentration operation is fed into the third concentration operation to obtain a two-step copper concentrate. The tailings of the third concentration operation are returned to the second concentration operation. During the second concentration process, the inhibitor added is 10g / t, and the inhibitor added in the third concentration operation is 8g / t. The tailings of the second concentration 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 collector added is 7g / t. The scavenging concentrate is returned to the fourth roughing operation, and the scavenging 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 in a low-copper and 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, which is then fed into a hydrocyclone for classification. The hydrocyclone overflow is fed into subsequent flotation operations, and the hydrocyclone underflow 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, after adding lime to the overflow of the cyclone in S1 to adjust the pH to 8, the mixture is fed into the flotation machine after being mixed with an inhibitor, a collector and a frother for the first roughing operation. The roughing inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in a ratio of 15:10:1, and the dosage range is 18g / t, the dosage range of the collector ethylthiocarbamate is 15g / t, and the dosage range of the frother is 10g / t. The first roughing concentrate is fed into the flotation column for rapid selection, and the dosage range of the collector is 12g / t. The column flotation concentrate is the one-step copper concentrate; the column flotation tailings are fed into the third roughing operation, and the dosage range of the collector in the third roughing operation is 43g / t. The third roughing tailings and the roughing concentrate are obtained, and the third roughing tailings are mixed with the collector and fed into the second scavenging operation, and the dosage range of the collector in the second scavenging operation is 50g / 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 tailings of the first roughing operation are mixed with inhibitors and collectors and then fed into the second roughing operation. The roughing inhibitor is prepared from disodium carboxymethyl trithiocarbonate, fenugreek gum and polyglutamic acid in the ratio of 15:10:1, and the dosage is 18g / t. The dosage of the collector sodium n-butyl xanthate is 40g / t, and the dosage of the frother is 8g / t. The tailings of the second roughing operation are fed into the flotation machine for the first scavenging operation after adding the collector. The dosage of the collector sodium n-butyl xanthate in the first scavenging operation is 9g / t. The concentrate of the first scavenging operation is returned to the second roughing operation. The tailings of the first scavenging operation are the final tailings. The concentrate of the second roughing operation is fed into the cyclone for classification. The overflow product is fed into the roughing operation in S2, and the sediment is fed into the ball mill for re-grinding;

[0062] S4, feed the reground product in S3 into the inspection and classification operation, check that the classification 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 of the inspection and classification cyclone is fed into the flotation machine. After adding the inhibitor, collector and frother, 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 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 10g / 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 scavenging concentrate is returned to the fourth roughing operation, and the scavenging tailings are fed into the cyclone for classification 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 of the low-copper and high-sulfur slurry system provided in this comparative example refers to Example 1, except that in steps S2 and S3, the pyrite inhibitor is lime.

[0066] Comparative Example 2

[0067] The copper-sulfur separation method of the low-copper and 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] The copper-sulfur separation method of the low-copper and 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.

[0069] Comparative Example 4

[0070] The copper-sulfur separation method of the low-copper and high-sulfur slurry system provided in this comparative example refers to Example 1, the only difference being that in steps S2 and S3, the pyrite inhibitor is polyglutamic acid.

[0071] Test Example 1

[0072] In the copper-sulfur separation method of the low-copper and high-sulfur slurry system in Examples 1 to 3 and Comparative Examples 1 to 4, the recovery rate and average grade of copper are shown in Table 1.

[0073] Table 1

[0074]

[0075] The above is a detailed introduction to a copper-sulfur separation method for a low-copper, high-sulfur slurry system provided in an embodiment of the present application. The description of the above embodiment is only used to help understand the method and its core idea of ​​the present application; at the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0076] 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. As mentioned throughout the specification and claims, "including" and "comprising" 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 problem within a certain error range and basically achieve the technical effect. The subsequent description of 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 determined by the definition of the attached claims.

[0077] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0078] The above description shows and describes several preferred embodiments of the present application, but as mentioned above, it should be understood that the present application is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but 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 the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present application, and should be within the scope of protection of the claims attached to the present application.

Claims

1. A method for separating copper and sulfur from a low-copper and high-sulfur slurry system, characterized in that , the copper-sulfur separation method specifically comprises the following steps: S1) feeding the raw ore into a ball mill for grinding to obtain ground material, which is fed into a hydrocyclone for classification, and the hydrocyclone overflow is fed into subsequent flotation operations, and the hydrocyclone underflow is returned to the ball mill for re-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 tailings, and feeding the first roughing concentrate into a flotation column for rapid concentration operation, and the column flotation concentrate is a one-step copper concentrate; The column flotation tailings are fed into the third roughing operation to obtain the third roughing tailings and roughing concentrate. The third roughing tailings are mixed with collectors and fed into the second scavenging operation. The second scavenging concentrate returns to the third roughing operation. The second scavenging tailings are the one-step two-stage tailings. S3) mixing the first roughing tailings in S2) with a collector and feeding them into the second roughing operation, adding the collector to the tailings of the second roughing operation and feeding them into a flotation machine for the first scavenging operation, the concentrate of the first scavenging operation is returned to the second roughing operation, the tailings of the first scavenging operation is the final tailings, the concentrate of the second roughing operation is fed into a hydrocyclone for pre-classification, the overflow product of the hydrocyclone is fed into the roughing operation in S2, and the sand settling product of the hydrocyclone is fed into a ball mill for re-grinding; S4) feeding the regrinding product in S3 into a cyclone for inspection and classification, feeding the sand settling material into a ball mill for regrinding, feeding the overflow material into a flotation machine after slurry adjustment, and performing a fourth roughing operation after adding an inhibitor, a collector and a frother, feeding the fourth roughing concentrate into a flotation column for a second concentration operation, feeding the second concentration concentrate into a third concentration operation to obtain a two-step copper concentrate, and returning the third concentration tailings to the second concentration operation, and returning the second concentration tailings to the inspection and classification operation; feeding the fourth roughing tailings into a flotation machine for scavenging operation, returning the scavenging concentrate to the fourth roughing operation, feeding the scavenging tailings into a tailing cyclone for tailing scavenging and classification, the cyclone overflow is the tailings, and the cyclone underflow is the sulfur concentrate.

2. The copper-sulfur separation method according to claim 1, characterized in that: 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% to 80%, and the medium filling rate is 30% to 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: The first roughing in S2) comprises: slurrying the ground material, adding lime to adjust the pH to 7-8, the inhibitor dosage range is 5-25 g / t, the collector dosage range is 12-15 g / t, and the foaming agent dosage range is 8-13 g / t; The flotation column rapid selection operation includes: the flotation column aeration volume is 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: The second roughing in S3) 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 sweep includes: the amount of collector used is in the range of 6 to 10 g / t; The pre-classification cyclone has a diameter of ∮380, a sand settling nozzle diameter of 55 mm, an overflow pipe diameter of 140 mm, and a cyclone pressure of 0.3-0.5 kg / cm 2 .

5. The copper-sulfur separation method according to claim 1, characterized in that: The second stage of grinding treatment in S4) includes: grinding concentration of 40% to 50%, medium filling rate of 20% to 30%; The inspection and classification 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 0.3-0.5kg / 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: 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.

10. The copper-sulfur separation method according to claim 1, characterized in that: After the copper-sulfur separation method is used, 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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