Method for improving quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore through column-machine combination

Abstract

The invention discloses a method for improving the quality of copper concentrate of copper-molybdenum-sulfur polymetallic ore through column-machine combination. The method comprises the steps that overflow of an ore grinding machine is fed into a flotation machine for primary roughing operation after being subjected to size mixing treatment, roughing concentrate is graded in advance, and roughing tailings are subjected to secondary roughing operation; settled sand of the pre-classification hydrocyclone is fed into a vertical mill for regrinding, ore grinding products are subjected to inspection classification operation, and overflow of the inspection classification hydrocyclone and overflow of the pre-classification hydrocyclone are combined and fed into copper-sulfur separation operation; secondary roughing tailings are subjected to scavenging operation twice, scavenged concentrates are sequentially returned to previous operation, and scavenged tailings are tailings of the final section; and copper-sulfur separation adopts one-time roughing, one-time concentration and four-time scavenging operation to obtain copper-molybdenum concentrate and second-stage sulfur-containing tailings. According to the method, column-machine combination is adopted on the basis of the particle size composition characteristics of ore grinding product particles, namely coarse particles are recycled through the flotation machine, fine particles are recycled through the flotation column, the yield of copper in the copper concentrate reaches 85% or above, and the quality of copper in the copper concentrate is higher.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, and 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 that is closely related to human beings. It is widely used in the fields of electricity, light industry, machinery manufacturing, construction industry, national defense industry, etc. With the large-scale mining of copper resources, the scale of copper concentrators has gradually expanded. The flotation operation of copper ore is large, and the flotation process has a large circulation load and large fluctuations. In particular, in the roughing and scavenging sections, the mineral sulfur content is high, the ore density is large, the particle size is coarse, the slurry sedimentation rate is fast, and it is easy to bury. In the concentrating section, the mineral particle size is fine, and the mineral flotation is easily affected by the agitation of the slurry fluid. Therefore, large-scale copper concentrators generally have the problem of difficulty in stabilizing and improving the copper concentrate grade and copper recovery rate. Summary of the invention

[0003] The purpose 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 roughing, scavenging and concentrating sections, flotation machines are used in the roughing and scavenging sections, and flotation columns are used in the concentrating section, assisted by a new type of copper mineral flotation collector, thereby effectively improving the quality and recovery rate of copper concentrate.

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

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

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

[0007] S3) mixing the second roughing tailings obtained in S1) 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;

[0008] 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 concentration operation, and the concentrated tailings are returned to the roughing operation. The concentrated concentrate is the final copper concentrate;

[0009] The roughing tailings are fed into the first scavenging operation, 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, the scavenging concentrates are returned to the upper operation, and the scavenging tailings are the second-stage sulfur-containing tailings.

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

[0011] The first roughing includes: the proportion of particles with a particle size of less than 0.074 mm in the overflow of the mill is 58wt% to 65wt%, and the pulp concentration is adjusted to 33% to 38%; after adding lime to adjust the pH to 7.5 to 8.5, a collector is added for a roughing, and the amount of the collector added is 21 to 24g / 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] Further, the pre-classification cyclone in S2) is of 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] Check that the model of the grading cyclone is φ350mm, the sand settling 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 sand settling concentration is 65%-75%, and the medium filling rate is 25%~35%; the vertical mill model is KLM-400L.

[0015] Furthermore, in the first scavenging 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 used 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] Further, 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 collector is 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 recovery rate in the copper concentrate treated by the method reaches more than 85%.

[0022] A copper concentrate is prepared by the 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 improves the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore. The method uses a flotation machine with strong mechanical stirring action to ensure the stability of the process, aiming at the characteristics of the coarse and scavenging sections with coarse grinding fineness and the fine scavenging sections with high sulfur content and high ore density, which have strong anti-interference ability, fast pulp sedimentation speed and easy burial. In view of the characteristics that the fine-grained minerals in the selected section are greatly affected by the agitation of the pulp during flotation, the conventional flotation machine has the problems of small effective sorting space, poor flotation effect, inclusions in the concentrate, useful metals in the tailings, low grade and recovery rate, and the static steady flow of the flotation column is used for recovery. The problems of low grade of copper concentrate and low recovery rate in the selected section are solved. In addition, a large amount of flotation site is saved, and the problem of large flotation site occupation in super-large copper ore concentrators is solved.

[0025] The use of a new collector made of a mixture of diethyl phthalate and modified ester-based thiourea can effectively achieve the precise capture of copper minerals. Assisted by 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 method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore by combining a column and a machine. 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 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.

[0028] like Figure 1 As shown, the present invention is a method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore by column-machine combination, 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 to a flotation machine for the 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 particles with a particle size of less than 0.074 mm in the overflow of the grinding mill account for 58wt% to 65wt%, and the pulp concentration is adjusted to 33%-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 sand in S1 into the vertical mill for grinding, inspecting and classifying the ground products, mixing the inspection and classification cyclone overflow with the pre-classified cyclone overflow and feeding them into the copper-sulfur separation operation, and returning the inspection and classification cyclone sand to the vertical mill to form a closed loop;

[0032] The pre-classification cyclone model is φ250mm, the sand settling nozzle is 35mm, the overflow pipe is 80mm, the insertion depth is 310mm, and the feed port is 40*60mm; the inspection classification cyclone model is φ350mm, the sand settling 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%, and the sand settling 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 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, and the concentrated tailings are returned to the roughing operation. The concentrated 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 classification operation in S2; the tailings of the second scavenging operation 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;

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

[0038] In the step S1, the first roughing includes: slurrying the overflow of the 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 the step S2, the vertical mill treatment includes: the grinding concentration is 60% to 75%, and the medium filling rate is 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 is 5-20 g / t;

[0043] (2) The amount of butyl xanthate used as the collector in the first sweep 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 1.5-3 g / t of butyl xanthate, and 1-2 g / t of butyl ammonium black powder;

[0046] (2) The dosage of the inhibitor in the flotation column concentration 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 powder respectively;

[0048] Example 1

[0049] S1. The raw ore is subjected to a first-stage grinding treatment. After the overflow of the mill is adjusted to pH 7.5 by adding lime, a collector is added, and the amount of the collector added is 24g / t. The frother is then fed into the flotation machine for the first roughing operation, the roughing concentrate is fed into the cyclone for pre-classification, and the roughing tailings are fed into the second roughing operation; the particles with a particle size of less than 0.074mm in the overflow of the mill account for 58wt%, the pulp concentration is adjusted to 33%, the grinding concentration is 76%, and the medium filling rate is 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 sand in S1 into the vertical mill for grinding, inspecting and classifying the ground products, mixing the inspection and classification cyclone overflow with the pre-classified cyclone overflow and feeding them into the copper-sulfur separation operation, and returning the inspection and classification cyclone sand to the vertical mill to form a closed loop;

[0052] Among them, the pre-classification cyclone model is φ250mm, the sand settling 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 sand settling 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 sand settling 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 agent 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 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, and the concentrated tailings are returned to the roughing operation. The concentrated 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 classification operation in S2; the tailings of the second scavenging operation 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;

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

[0057] (2) The dosage of the inhibitor in the flotation column concentration 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 treatment, with a grinding concentration of 76% and a medium filling rate of 34%. After the overflow of the mill is adjusted to pH 8 by adding lime, a collector is added, and the amount of the collector added is 20g / t. The frother is then fed into the flotation machine for the first roughing operation, the roughing concentrate is fed into the cyclone for pre-grading, and the roughing tailings are fed into the second roughing operation; the proportion of particles with a particle size of less than 0.074mm in the overflow of the mill is 60wt%, and the pulp 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 sand in S1 into the vertical mill for grinding, inspecting and classifying the ground products, mixing the inspection and classification cyclone overflow with the pre-classified cyclone overflow and feeding them into the copper-sulfur separation operation, and returning the inspection and classification cyclone sand to the vertical mill to form a closed loop;

[0063] Among them, the pre-classification cyclone model is φ250mm, the sand settling 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 sand settling 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 sand settling 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 agent 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 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, and the concentrated tailings are returned to the roughing operation. The concentrated 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 classification operation in S2; the tailings of the second scavenging operation 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;

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

[0068] (2) The dosage of the inhibitor in the flotation column concentration 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 powder respectively;

[0070] Example 3

[0071] S1. The raw ore is subjected to a first-stage grinding treatment, with a grinding concentration of 80% and a medium filling rate of 40%. After the overflow of the mill is adjusted to pH 7.5 by adding lime, a collector is added, and the amount of the collector added is 21g / t. The frother is then fed into the flotation machine for the first roughing operation, the roughing concentrate is fed into the cyclone for pre-grading, and the roughing tailings are fed into the second roughing operation; the proportion of particles with a particle size of less than 0.074mm in the overflow of the mill is 59wt%, and the pulp 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 sand in S1 into the vertical mill for grinding, inspecting and classifying the ground products, mixing the inspection and classification cyclone overflow with the pre-classified cyclone overflow and feeding them into the copper-sulfur separation operation, and returning the inspection and classification cyclone sand to the vertical mill to form a closed loop;

[0074] The pre-classification cyclone model is φ250mm, the sand settling nozzle is 35mm, the overflow pipe is 80mm, the insertion depth is 310mm, and the feed port is 40*60mm; the inspection classification cyclone model is φ350mm, the sand settling 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 0.11PMa, the feed concentration is 38%, and the sand settling 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 6g / t and the dosage of butyl xanthate is 15g / t, and the dosage of butyl xanthate in the scavenging process is 10g / t;

[0077] S4, feeding the mixed material in S2 into a flotation column, mixing 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, and the concentrated tailings are returned to the roughing operation. The concentrated 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 classification operation in S2; the tailings of the second scavenging operation 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;

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

[0079] (2) The dosage of the inhibitor in the flotation column concentration 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, the only difference being that, in the flotation operation, the flotation is entirely carried out using flotation columns.

[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, the only difference being that, in the flotation operation, the flotation machine is used for all the 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, 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 the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims

1. A method for improving the quality of copper concentrate in copper-molybdenum-sulfur polymetallic ore by column-machine combination, characterized in that: The method specifically comprises the following steps: S1) subjecting the copper-molybdenum-sulfur polymetallic ore to a first-stage grinding process, and feeding the overflow of the grinding machine to a collector and a frother to a flotation machine for a first roughing operation, feeding the roughing concentrate to a cyclone for a pre-classification operation, and feeding the roughing tailings to a second roughing operation; S2) feeding the pre-classified cyclone sand in S1) into a vertical mill for grinding, inspecting and classifying the ground product, mixing the inspection and classification cyclone overflow with the pre-classified cyclone overflow and feeding it into a copper-sulfur separation operation, and returning the inspection and classification cyclone sand to the vertical mill to form a closed loop; S3) mixing the second roughing tailings obtained in S1) 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; 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 concentration operation, and the concentrated tailings are returned to the roughing operation. The concentrated concentrate is the final copper concentrate; The roughing tailings are fed into the first scavenging operation, 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, the scavenging concentrates are returned to the upper operation, and the scavenging tailings are the second-stage sulfur-containing tailings.

2. The method according to claim 1, characterized in that The grinding concentration in S1) is 76% to 80%, and the medium filling rate is 34% to 41%; The first roughing includes: the particles with a particle size of less than 0.074 mm in the overflow of the mill account for 58wt% to 65wt%, and the pulp concentration is adjusted to 33% to 38%; after adding lime to adjust the pH to 7.5 to 8.5, a collector is added for a roughing, and the amount of the collector added is 21 to 24g / t.

3. The method according to claim 2, characterized in that 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.

4. The method according to claim 1, characterized in that The pre-classification cyclone in S2) has a diameter of 250 mm, a sand settling nozzle of 35 mm, an overflow pipe of 80 mm, an insertion depth of 310 mm, and a feed port of 40*60 mm; Check that the model of the grading cyclone is φ350mm, the sand settling 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 sand settling concentration is 65%-75%, and the medium filling rate is 25%~35%; the vertical mill model is KLM-400L.

5. The method according to claim 1, characterized in that In the first scavenging 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.

6. The method according to claim 5, characterized in that 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.

7. 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 collector is 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 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.

8. The method according to claim 7, characterized in that The inhibitor is a solid powder with a polyammonium salt content greater than 85%.

9. The method according to claim 1, characterized in that: The copper recovery rate of the copper concentrate treated by the method reaches more than 85%.

10. A copper concentrate, characterized in that: The copper concentrate is prepared by the method according to any one of claims 1 to 9.

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