A column-machine combined method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore

Abstract

The present invention discloses a column-machine combined method for improving the quality of copper concentrate in a copper-molybdenum-sulfur polymetallic ore. The method comprises: the overflow from the mill undergoes slurry conditioning and is then fed to a flotation machine for a primary roughing operation. The roughing concentrate undergoes pre-grading, and the roughing tailings undergo a secondary roughing operation. The pre-grading cyclone sedimentation is fed to a vertical mill for regrinding. The milled product is fed to an inspection and grading operation. The overflow from the inspection and grading cyclone and the overflow from the pre-grading cyclone are combined and fed to a copper-sulfur separation operation. The secondary roughing tailings are fed to two scavenging operations, with the scavenged concentrates sequentially returned to the upper operation, with the scavenged tailings forming the final stage tailings. The copper-sulfur separation utilizes a primary roughing operation, a primary concentrating operation, and four scavenging operations to produce a copper-molybdenum concentrate and a secondary sulfur-containing tailings. Based on the particle size composition characteristics of the grinding product, the present invention utilizes a column-machine combined method, whereby the coarse particles are recovered using a flotation machine and the fine particles using flotation columns. This method achieves a copper yield of over 85% in the copper concentrate, resulting in a higher copper quality.

Description

Technical Field

[0001] The present invention relates to the technical field of mineral processing, in particular to a column-machine combined method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore. Background Art

[0002] Copper is a non-ferrous metal closely associated with humanity, widely used in the electrical, light, machinery, construction, and defense industries. With the increasing exploitation of copper resources, the scale of copper concentrators has also gradually expanded. Copper flotation operations are arduous, with high cycle loads and significant fluctuations during the flotation process. In particular, in the roughing and scavenging sections, the ore has high sulfur content, high density, and coarse particle size, resulting in rapid slurry settling and prone to burial. In the concentrating section, on the other hand, the ore has fine particle size, and flotation is easily affected by slurry fluid agitation. Consequently, large-scale copper concentrators face the challenge of stabilizing and improving copper concentrate grade and copper recovery rates. Summary of the Invention

[0003] The object of the present invention is to provide a column-machine combined method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore. Based on the differences in material properties in the roughing, scavenging and cleaning sections, a flotation machine is used in the roughing and scavenging sections, and a flotation column is used in the cleaning section, supplemented by a new type of copper mineral flotation collector, thereby effectively improving the quality and recovery rate of the copper concentrate.

[0004] In order to achieve the above-mentioned object of the present invention, the following technical scheme is specially adopted: a column-machine combined method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore, the method specifically comprising the following steps:

[0005] S1) subjecting the copper concentrate of the copper-molybdenum-sulfur polymetallic ore to a first-stage grinding process, mixing the overflow of the grinding mill with a collector and a frother, and then feeding it into a flotation machine for a first roughing operation, feeding the roughing concentrate into a cyclone for pre-classification, and feeding the roughing tailings into a second roughing operation;

[0006] S2) feeding the pre-classified cyclone grit in S1) into a vertical mill for grinding, inspecting and classifying the ground product, mixing the overflow of the inspection-classified cyclone with the overflow of the pre-classified cyclone and feeding it into a copper-sulfur separation process, and returning the inspection-classified cyclone grit to the vertical mill to form a closed-circuit cycle;

[0007] S3) mixing the second roughing tailings obtained in S1) with a collector and feeding the mixture into the first scavenging operation of the flotation machine, the second roughing concentrate is returned to the upper operation, the first scavenging concentrate is returned to the second roughing, the first scavenging tailings are fed into the second scavenging operation, the scavenging concentrate is returned to the upper operation, and the scavenging tailings are the final tailings of the first operation;

[0008] S4) feeding the mixed material obtained in S2) into a flotation column, mixing it with an inhibitor and a collector, and then performing a roughing operation. The roughing concentrate is fed into a flotation column for a concentrating operation. The concentrating tailings are returned to the roughing operation. The concentrating concentrate is the final copper concentrate;

[0009] The roughing tailings are fed into the first scavenging operation, and the first scavenging tailings are fed into the second scavenging operation. The first and second scavenging concentrates are combined and returned to the inspection and grading operation in S2); the second scavenging tailings are fed into the third scavenging operation, and the scavenging concentrate is returned to the upper operation. The scavenging tailings are the second-stage sulfur-containing tailings.

[0010] Furthermore, the grinding concentration in S1) is 76% to 80%, and the medium filling rate is 34% to 41%;

[0011] The first roughing step includes: adjusting the proportion of particles with a diameter of less than 0.074 mm in the overflow of the mill to 58 wt% to 65 wt%, adjusting the pulp concentration to 33% to 38%; adding lime to adjust the pH to 7.5 to 8.5, and then adding a collector for a first roughing step, wherein the amount of the collector added is 21 to 24 g / t;

[0012] Furthermore, the collector is a mixture of diethyl phthalate and modified ester-based thiourea, with a mass ratio of 6-8:4-3; and the foaming agent is 2# oil.

[0013] Furthermore, the pre-classification cyclone in S2) is of model φ250mm, with a sand settling nozzle of 35mm, an overflow pipe of 80mm, an insertion depth of 310mm, and a feed port of 40*60mm;

[0014] The inspection shows that the grading cyclone model is φ350mm, the grit nozzle is 50mm, the overflow pipe is 120mm, the insertion depth is 260mm, and the equivalent diameter of the feed port is 110mm; the cyclone pressure is 0.08-0.12PMa, the feed concentration is 35%-45%, the grit concentration is 65%-75%, and the medium filling rate is 25%-35%; the vertical mill model is KLM-400L.

[0015] Furthermore, in the first sweeping operation in S3), the amount of collector used is 5-10 g / t and the amount of butyl xanthate used is 10-20 g / t.

[0016] Furthermore, the collector selected in the first sweep is a mixture of diethyl phthalate and modified ester-based thiourea, and the mass ratio between the two is 6-8:4-3.

[0017] Furthermore, in the primary roughing operation in S4), the pulp concentration is adjusted to 18%-24%, the inhibitor dosage range is 12.5-30 g / t, and the collectors are butyl xanthate and butyl ammonium black medicine, wherein the dosage of butyl xanthate is 1.5-3 g / t and the dosage of butyl ammonium black medicine is 1-2 g / t;

[0018] The dosage of the inhibitor in the flotation column concentration operation ranges from 12 to 30 g / t;

[0019] The collectors in the first sweeping operation and the second sweeping operation are butyl xanthate and butyl ammonium black medicine, wherein the amount of butyl xanthate is 1.5-2.5 g / t and the amount of butyl ammonium black medicine is 0.5-1 g / t.

[0020] Furthermore, the inhibitor is a solid powder with a polyammonium salt content greater than 85%.

[0021] Furthermore, the copper yield in the copper concentrate treated by the method reaches more than 85%.

[0022] A copper concentrate is prepared by the above method.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The column-machine combined method provided by the present invention for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ores uses a flotation machine with a strong mechanical stirring action to ensure process stability, targeting the characteristics of coarse grinding fineness, scavenging sections, and fine scavenging sections with high sulfur content and high ore density, which have strong anti-interference capabilities, fast pulp sedimentation speed, and easy burial. The flotation of fine-grained minerals in the selected section is greatly affected by pulp agitation, and conventional flotation machines have the problems of small effective sorting space, poor flotation effect, inclusions in concentrate, useful metals in tailings, and low grade and recovery rate. The static steady flow of flotation columns is used for recovery. This solves the problems of low copper concentrate grade and low recovery rate in the selected section. It also saves a large amount of flotation space, solving the problem of large flotation site occupation in super-large copper ore concentrators.

[0025] The use of a new collector made from a mixture of diethyl phthalate and modified ester-based thiourea can effectively achieve the precise capture of copper minerals. Combined with the machine-column combined recovery process, the quality of copper concentrate can be greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The present invention is a flowchart of a column-machine combined method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figure 1 As shown, the present invention provides a column-machine combined method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore, comprising the following steps:

[0029] S1. The raw ore is subjected to a first-stage grinding process. The overflow of the grinding mill is mixed with a collector and a frother and then fed into a flotation machine for a first roughing operation. The roughing concentrate is fed into a cyclone for pre-classification, and the roughing tailings are fed into a second roughing operation. The particles with a particle size of less than 0.074 mm in the overflow of the grinding mill account for 58 wt% to 65 wt%, and the pulp concentration is adjusted to 33% to 38%;

[0030] The collector is diethyl phthalate and modified ester-based thiourea in a mass ratio of 6-8:4-3, and the foaming agent is 2# oil.

[0031] S2, feeding the pre-classified cyclone grit in S1 into a vertical mill for grinding, inspecting and classifying the ground product, mixing the overflow of the inspection-classified cyclone with the overflow of the pre-classified cyclone and feeding it into a copper-sulfur separation process, and returning the inspection-classified cyclone grit into the vertical mill to form a closed circuit;

[0032] The pre-classification cyclone is φ250mm, with a grit nozzle of 35mm, an overflow pipe of 80mm, an insertion depth of 310mm, and a feed opening of 40*60mm. The inspection and classification cyclone is φ350mm, with a grit nozzle of 50mm, an overflow pipe of 120mm, an insertion depth of 260mm, and an equivalent feed opening diameter of 110mm. The cyclone pressure is 0.08-0.12PMa, the feed concentration is 35%-45%, and the grit concentration is 65%-75%. The vertical mill model is KLM-400L.

[0033] S3, mixing the second roughing tailings with a collector and feeding them into the first scavenging operation of the flotation machine, the second roughing concentrate is returned to the upper operation, the first scavenging concentrate is returned to the second roughing, the first scavenging tailings are fed into the second scavenging operation, the scavenging concentrate is returned to the upper operation, and the scavenging tailings are the final tailings of the first operation;

[0034] The flotation equipment used in S3 is a flotation machine, and the collector is diethyl phthalate and modified ester thiourea, with a mass ratio of 6-8:4-3 and butyl xanthate;

[0035] S4, feeding the mixed material in S2 into a flotation column, mixing it with a depressant and a collector, and then performing a roughing operation. The roughing concentrate is fed into a flotation column for a concentration operation. The concentrated tailings are returned to the roughing operation, and the concentrated concentrate is the final copper concentrate; the roughing tailings are fed into a first scavenging operation, and the first scavenging tailings are fed into a second scavenging operation. The first and second scavenging concentrates are combined and returned to the inspection and classification operation in S2; the tailings from the second scavenging operation are fed into a third scavenging operation, and the scavenging concentrate is returned to the upper operation. The scavenging tailings are the second-stage sulfur-containing tailings;

[0036] The collector comprises diethyl phthalate and modified ester-based thiourea in a mass ratio of 6-8:4-3, and butyl xanthate in a concentration of 10%.

[0037] In step S1, the grinding concentration is 76% to 80%, and the medium filling rate is 34% to 41%.

[0038] In step S1, the first roughing includes: slurrying the overflow of the grinding mill, adding lime to adjust the pH to 7.5-8.5, and then adding a collector to perform a roughing.

[0039] In the step S1, the amount of the collector added is 21-24 g / t.

[0040] In step S2, the vertical mill treatment includes: grinding concentration of 60% to 75%, and medium filling rate of 25% to 35%.

[0041] The step S3 should include the following steps:

[0042] (1) The collector in the second roughing operation is diethyl phthalate and modified ester thiourea in a ratio of 6-8:4-3, with a dosage range of 5-10 g / t and butyl xanthate at 5-20 g / t;

[0043] (2) The amount of butyl xanthate used as the collector in the first sweeping operation is 6-20 g / t;

[0044] The step S4 should include the following steps:

[0045] (1) In the roughing operation, the pulp concentration is adjusted to 18%-24%, the dosage of the inhibitor is in the range of 12.5-30 g / t, the dosage of the collector is in the range of butyl xanthate 1.5-3 g / t, and the dosage of butyl ammonium black powder 1-2 g / t;

[0046] (2) The dosage of the inhibitor in the flotation column selection operation ranges from 12 to 30 g / t;

[0047] (3) The dosage range of the collector in the first sweeping operation and the second sweeping operation is 1.5-2.5 g / t of butyl xanthate and 0.5-1 g / t of butyl ammonium black medicine respectively;

[0048] Example 1

[0049] S1. The raw ore is subjected to a first-stage grinding process. Lime is added to the mill overflow to adjust the pH to 7.5, and then a collector is added at a rate of 24 g / t. After the frother, the ore is fed to a flotation cell for a first roughing operation. The roughing concentrate is fed to a cyclone for pre-classification, and the roughing tailings are fed to a second roughing operation. The mill overflow contains 58 wt% particles with a diameter less than 0.074 mm. The pulp concentration is adjusted to 33%, the grinding concentration to 76%, and the media fill rate to 34%.

[0050] The collector is diethyl phthalate and modified ester-based thiourea in a mass ratio of 8:3, and the foaming agent is 2# oil.

[0051] S2, feeding the pre-classified cyclone grit in S1 into a vertical mill for grinding, inspecting and classifying the ground product, mixing the overflow of the inspection-classified cyclone with the overflow of the pre-classified cyclone and feeding it into a copper-sulfur separation process, and returning the inspection-classified cyclone grit into the vertical mill to form a closed circuit;

[0052] Among them, the pre-classification cyclone model is φ250mm, the grit nozzle is 35mm, the overflow pipe is 80mm, the insertion depth is 310mm, and the feed port is 40*60mm; the inspection and classification cyclone model is φ350mm, the grit nozzle is 50mm, the overflow pipe is 120mm, the insertion depth is 260mm, and the equivalent diameter of the feed port is 110mm; the cyclone pressure is 0.12PMa, the feed concentration is 45%, and the grit concentration is 75%; the vertical mill model is KLM-400L; the grinding concentration is 60%, and the medium filling rate is 25%.

[0053] S3, mixing the second roughing tailings with a collector and feeding them into the first scavenging operation of the flotation machine, the second roughing concentrate is returned to the upper operation, the first scavenging concentrate is returned to the second roughing, the first scavenging tailings are fed into the second scavenging operation, the scavenging concentrate is returned to the upper operation, and the scavenging tailings are the final tailings of the first operation;

[0054] The flotation equipment used in S3 is a flotation machine, the collector is diethyl phthalate and modified ester thiourea, the mass ratio is 7:3, the dosage of the reagent is 5g / t and the dosage of butyl xanthate is 14g / t, and the dosage of butyl xanthate in the scavenging process is 6g / t;

[0055] S4, feeding the mixed material in S2 into a flotation column, mixing it with a depressant and a collector, and then performing a roughing operation. The roughing concentrate is fed into a flotation column for a concentration operation. The concentrated tailings are returned to the roughing operation, and the concentrated concentrate is the final copper concentrate; the roughing tailings are fed into a first scavenging operation, and the first scavenging tailings are fed into a second scavenging operation. The first and second scavenging concentrates are combined and returned to the inspection and classification operation in S2; the tailings from the second scavenging operation are fed into a third scavenging operation, and the scavenging concentrate is returned to the upper operation. The scavenging tailings are the second-stage sulfur-containing tailings;

[0056] (1) During the roughing operation, the pulp concentration was adjusted to 24%, the inhibitor dosage was 30 g / t, the collector dosage was 3 g / t of butyl xanthate, and 2 g / t of butyl ammonium black powder;

[0057] (2) The dosage of the inhibitor in the flotation column selection operation is 30 g / t;

[0058] (3) The dosage of the collector in the first sweeping operation and the second sweeping operation is 2.5 g / t of butyl xanthate and 1 g / t of butyl ammonium black medicine respectively;

[0059] Example 2

[0060] S1. The raw ore is subjected to a first-stage grinding process, achieving a grinding concentration of 76% and a media fill rate of 34%. The mill overflow is adjusted to a pH of 8 by adding lime, and then a collector is added at a rate of 20 g / t. After the addition of a frother, the ore is fed to a flotation cell for the first roughing operation. The roughing concentrate is fed to a cyclone for pre-classification, and the roughing tailings are fed to the second roughing operation. The mill overflow contains particles with a size less than 0.074 mm, accounting for 60% by weight. The slurry concentration is adjusted to 36%.

[0061] The collector is diethyl phthalate and modified ester-based thiourea in a mass ratio of 8:4, and the foaming agent is 2# oil.

[0062] S2, feeding the pre-classified cyclone grit in S1 into a vertical mill for grinding, inspecting and classifying the ground product, mixing the overflow of the inspection-classified cyclone with the overflow of the pre-classified cyclone and feeding it into a copper-sulfur separation process, and returning the inspection-classified cyclone grit into the vertical mill to form a closed circuit;

[0063] Among them, the pre-classification cyclone model is φ250mm, the grit nozzle is 35mm, the overflow pipe is 80mm, the insertion depth is 310mm, and the feed port is 40*60mm; the inspection and classification cyclone model is φ350mm, the grit nozzle is 50mm, the overflow pipe is 120mm, the insertion depth is 260mm, and the equivalent diameter of the feed port is 110mm; the cyclone pressure is 0.10PMa, the feed concentration is 43%, and the grit concentration is 71%; the vertical mill model is KLM-400L; the grinding concentration is 65%, and the medium filling rate is 30%.

[0064] S3, mixing the second roughing tailings with a collector and feeding them into the first scavenging operation of the flotation machine, the second roughing concentrate is returned to the upper operation, the first scavenging concentrate is returned to the second roughing, the first scavenging tailings are fed into the second scavenging operation, the scavenging concentrate is returned to the upper operation, and the scavenging tailings are the final tailings of the first operation;

[0065] The flotation equipment used in S3 is a flotation machine, the collector is diethyl phthalate and modified ester thiourea, the mass ratio is 7:4, the dosage of the reagent is 8g / t and the dosage of butyl xanthate is 16g / t, and the dosage of butyl xanthate in the scavenging process is 8g / t;

[0066] S4, feeding the mixed material in S2 into a flotation column, mixing it with a depressant and a collector, and then performing a roughing operation. The roughing concentrate is fed into a flotation column for a concentration operation. The concentrated tailings are returned to the roughing operation, and the concentrated concentrate is the final copper concentrate; the roughing tailings are fed into a first scavenging operation, and the first scavenging tailings are fed into a second scavenging operation. The first and second scavenging concentrates are combined and returned to the inspection and classification operation in S2; the tailings from the second scavenging operation are fed into a third scavenging operation, and the scavenging concentrate is returned to the upper operation. The scavenging tailings are the second-stage sulfur-containing tailings;

[0067] (1) In the roughing operation, the pulp concentration is adjusted to 20%, the inhibitor dosage is 25 g / t, the collector dosage is butyl xanthate 2 g / t, and butyl ammonium black powder 1 g / t;

[0068] (2) The dosage of the inhibitor in the flotation column selection operation is 20 g / t;

[0069] (3) The dosage of the collector in the first sweeping operation and the second sweeping operation is 2 g / t of butyl xanthate and 0.5 g / t of butyl ammonium black medicine respectively;

[0070] Example 3

[0071] S1. The raw ore is subjected to a first-stage grinding process, with a grinding concentration of 80% and a media fill rate of 40%. The mill overflow is adjusted to a pH of 7.5 by adding lime, and then a collector is added at a rate of 21 g / t. After the addition of a frother, the ore is fed to a flotation cell for the first roughing operation. The roughing concentrate is fed to a cyclone for pre-classification, and the roughing tailings are fed to the second roughing operation. The mill overflow contains 59% by weight of particles with a size less than 0.074 mm. The slurry concentration is adjusted to 33%.

[0072] The collector is diethyl phthalate and modified ester-based thiourea in a mass ratio of 8:4, and the foaming agent is 2# oil.

[0073] S2, feeding the pre-classified cyclone grit in S1 into a vertical mill for grinding, inspecting and classifying the ground product, mixing the overflow of the inspection-classified cyclone with the overflow of the pre-classified cyclone and feeding it into a copper-sulfur separation process, and returning the inspection-classified cyclone grit into the vertical mill to form a closed circuit;

[0074] The pre-classification cyclone is φ250mm, with a grit nozzle of 35mm, an overflow pipe of 80mm, an insertion depth of 310mm, and a feed opening of 40*60mm. The inspection and classification cyclone is φ350mm, with a grit nozzle of 50mm, an overflow pipe of 120mm, an insertion depth of 260mm, and a feed opening equivalent diameter of 110mm. The cyclone pressure is 0.11PMa, the feed concentration is 38%, and the grit concentration is 67%. The vertical mill model is KLM-400L.

[0075] S3, mixing the second roughing tailings with a collector and feeding them into the first scavenging operation of the flotation machine, the second roughing concentrate is returned to the upper operation, the first scavenging concentrate is returned to the second roughing, the first scavenging tailings are fed into the second scavenging operation, the scavenging concentrate is returned to the upper operation, and the scavenging tailings are the final tailings of the first operation;

[0076] The flotation equipment used in S3 is a flotation machine, the collectors are diethyl phthalate and modified ester thiourea, the mass ratio is 8:4, the dosage of the reagent is 6 g / t and the dosage of butyl xanthate is 15 g / t, and the dosage of butyl xanthate in the scavenging process is 10 g / t;

[0077] S4, feeding the mixed material in S2 into a flotation column, mixing it with a depressant and a collector, and then performing a roughing operation. The roughing concentrate is fed into a flotation column for a concentration operation. The concentrated tailings are returned to the roughing operation, and the concentrated concentrate is the final copper concentrate; the roughing tailings are fed into a first scavenging operation, and the first scavenging tailings are fed into a second scavenging operation. The first and second scavenging concentrates are combined and returned to the inspection and classification operation in S2; the tailings from the second scavenging operation are fed into a third scavenging operation, and the scavenging concentrate is returned to the upper operation. The scavenging tailings are the second-stage sulfur-containing tailings;

[0078] (1) During the roughing operation, the pulp concentration was adjusted to 23%, the inhibitor dosage was 12.5 g / t, the collector dosage was 1.5 g / t of butyl xanthate, and 1 g / t of butyl ammonium black powder;

[0079] (2) The dosage of the inhibitor in the flotation column selection operation is 12 g / t;

[0080] (3) The dosage of the collector in the first sweeping operation and the second sweeping operation is 1.5 g / t of butyl xanthate and 0.5 g / t of butyl ammonium black medicine respectively;

[0081] Comparative Example 1

[0082] The column-machine combined method for improving the quality of copper concentrate of copper-molybdenum-sulfur polymetallic ore provided in this comparative example refers to Example 1, with the only difference being that, in the flotation operation, flotation columns are used throughout.

[0083] Comparative Example 2

[0084] The column-machine combined method for improving the quality of copper concentrate of copper-molybdenum-sulfur polymetallic ore provided in this comparative example refers to Example 1, with the only difference being that, in the flotation operation, the flotation machine is used for all flotation operations.

[0085] Comparative Example 3

[0086] The column-machine combined method for improving the quality of copper concentrate of copper-molybdenum-sulfur polymetallic ore provided in this comparative example refers to Example 1, with the only difference being that, in the flotation operation, flotation columns are used for roughing and scavenging, and flotation machines are used for concentrating.

[0087] Table 1

[0088]

[0089]

[0090] It is only used to illustrate the technical solution of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. A column-machine combined method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore, characterized in that: The method specifically comprises the following steps: S1) The copper-molybdenum-sulfur polymetallic ore is subjected to a first-stage grinding process. The overflow of the grinding mill is mixed with a collector and a frother and then fed into a flotation machine for the first roughing operation. The roughing concentrate is fed into a cyclone for pre-classification, and the roughing tailings are fed into a second roughing operation. The grinding concentration is 76%~80%, and the media filling rate is 34%~41%; The first roughing step includes: adjusting the proportion of particles with a diameter of less than 0.074 mm in the overflow of the mill to 58 wt% to 65 wt%, adjusting the pulp concentration to 33% to 38%, adding lime to adjust the pH to 7.5 to 8.5, and then adding a collector for a first roughing step, wherein the amount of collector added is 21 to 24 g / t; The collector is a mixture of diethyl phthalate and modified ester-based thiourea, with a mass ratio of 6-8:4-3; the foaming agent is 2# oil; S2) feeding the pre-classified cyclone grit in S1) into a vertical mill for grinding, inspecting and classifying the ground product, mixing the overflow of the inspection-classified cyclone with the overflow of the pre-classified cyclone and feeding it into a copper-sulfur separation process, and returning the inspection-classified cyclone grit into the vertical mill to form a closed-circuit cycle; S3) The second roughing tailings obtained in S1) are mixed with a collector and fed into the first scavenging operation of the flotation machine. The second roughing concentrate is returned to the upper operation. The first scavenging concentrate is returned to the second roughing. The first scavenging tailings are fed into the second scavenging operation. The scavenging concentrate is returned to the upper operation. The scavenging tailings are the final tailings of the first operation. The amount of collector used in the first sweep operation is 5-10 g / t and the amount of butyl xanthate is 10-20 g / t; The collector used in the first sweep is a mixture of diethyl phthalate and modified ester-based thiourea, with a mass ratio of 6-8:4-3; S4) feeding the mixed material obtained in S2) into a flotation column, mixing it with a depressant and a collector, and then performing a roughing operation. The roughing concentrate is fed into a flotation column for a cleaning operation. The cleaned tailings are returned to the roughing operation. The cleaned concentrate is the final copper concentrate. The roughing tailings are fed into the first scavenging operation, and the first scavenging tailings are fed into the second scavenging operation. The first and second scavenging concentrates are combined and returned to the inspection and grading operation in S2); the second scavenging tailings are fed into the third scavenging operation, and the scavenging concentrate is returned to the upper operation. The scavenging tailings are the second-stage sulfur-containing tailings.

2. The method according to claim 1, characterized in that The pre-classification cyclone in S2) is of diameter 250mm, with a sand trap of 35mm, an overflow pipe of 80mm, an insertion depth of 310mm, and a feed port of 40*60mm; The inspection shows that the grading cyclone model is φ350mm, the grit nozzle is 50mm, the overflow pipe is 120mm, the insertion depth is 260mm, and the equivalent diameter of the feed port is 110mm; the cyclone pressure is 0.08-0.12PMa, the feed concentration is 35%-45%, the grit concentration is 65%-75%, and the medium filling rate is 25%~35%; the vertical mill model is KLM-400L.

3. The method according to claim 1, characterized in that In the primary roughing operation in S4), the pulp concentration is adjusted to 18%-24%, the inhibitor dosage range is 12.5-30 g / t, and the collectors are butyl xanthate and butyl ammonium black medicine, wherein the dosage of butyl xanthate is 1.5-3 g / t and the dosage of butyl ammonium black medicine is 1-2 g / t; The dosage of the inhibitor in the flotation column concentration operation ranges from 12 to 30 g / t; The collectors in the first and second scavenging operations are butyl xanthate and butyl ammonium black medicine, wherein the amount of butyl xanthate is 1.5-2.5 g / t and the amount of butyl ammonium black medicine is 0.5-1 g / t.

4. The method according to claim 3, characterized in that The inhibitor is a solid powder with a polyammonium salt content greater than 85%.

5. The method according to claim 1, wherein The copper yield in the copper concentrate treated by the method reaches more than 85%.

6. A copper concentrate, characterized in that: The copper concentrate is prepared by the method according to any one of claims 1 to 5.

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