Copper-molybdenum bulk concentrate flotation separation inhibitor, preparation method thereof and beneficiation method for copper-molybdenum bulk concentrate separation

Abstract

The invention relates to the technical field of non-ferrous metal beneficiation, in particular to a copper-molybdenum bulk concentrate flotation separation inhibitor, a preparation method thereof and a beneficiation method for copper-molybdenum bulk concentrate separation. The inhibitor comprises D-erythorbic acid and sodium ethylene diamine tetramethylene phosphonate. D-erythorbic acid is used as a strong reducing agent, elemental sulfur and high-valence metal ions generated on the surface of the chalcopyrite due to oxidation or adsorption of the collecting agent can be rapidly reduced, a hydrophobic collecting agent adsorption layer is destroyed, and efficient'reagent removal 'is achieved. Sodium ethylenediamine tetramethylene phosphonate is a polydentate organic phosphonic acid chelating agent, and four phosphonic acid groups of the sodium ethylenediamine tetramethylene phosphonate and Cu < + > / Cu < 2 + > exposed on the surface of the chalcopyrite can form an extremely stable multi-core chelate. The firm adsorption layer enables hydrophilic phosphonic acid groups to face ore pulp, so that the surface of the chalcopyrite is strongly hydrophilic and is deeply inhibited, the two agents do not adsorb molybdenite at all, and under the cooperation of the two agents and under the condition that the using amount of sodium sulfide is low, copper sulfide minerals are effectively inhibited, and efficient separation of copper and molybdenum is achieved.

Description

Technical Field

[0001] This application relates to the field of non-ferrous metal beneficiation technology, and in particular to a flotation separation inhibitor for copper-molybdenum mixed concentrate, its preparation method, and a beneficiation method for separating copper-molybdenum mixed concentrate. Background Technology

[0002] Copper, with its excellent electrical and thermal conductivity, is widely used in the power and manufacturing industries; molybdenum, on the other hand, has irreplaceable value in high-end fields such as metallurgy, chemical industry, and aerospace due to its high-temperature resistance, corrosion resistance, and alloying properties. In nature, copper and molybdenum minerals often occur in close association, and molybdenite and chalcopyrite have similar floatability, making their separation difficult. The "copper suppression and molybdenum flotation" process is widely used in industry, the core of which lies in developing inhibitors that can efficiently and selectively suppress copper sulfide minerals without impairing the floatability of molybdenite.

[0003] Traditional processes have long relied on cyanide, Knox reagent, or high doses of sodium sulfide, which, while having some inhibitory effect, suffer from drawbacks such as toxicity, high environmental risk, poor operational safety, and sensitivity to the redox potential of the ore pulp. In recent years, to overcome the shortcomings of inorganic inhibitors, researchers have developed various organic inhibitors, such as sodium thioglycolate, chitosan, and thioureas, which can effectively inhibit copper sulfide ore. However, their high production costs and selectivity limit their large-scale industrial application. Other researchers have developed novel inhibitors such as L-cysteine, calcium sulfate gel, and proline, but most remain in the experimental research stage.

[0004] Therefore, developing efficient, low-cost, and environmentally friendly copper-molybdenum separation inhibitors is of great significance for the production of high-quality molybdenum concentrate. Summary of the Invention

[0005] Therefore, the purpose of this application is to overcome the shortcomings of the prior art and provide a flotation separation inhibitor for copper-molybdenum mixed concentrate, its preparation method, and a mineral processing method for separating copper-molybdenum mixed concentrate. This addresses the technical problems of high dosage and environmental unfriendliness associated with traditional inhibitors such as sodium sulfide.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] First, this application provides a flotation separation inhibitor for copper-molybdenum mixed concentrate, comprising D-isoascorbic acid and sodium ethylenediaminetetramethylenephosphonate.

[0008] Preferably, the inhibitor comprises 25-35% D-isoascorbic acid and 65-75% sodium ethylenediaminetetramethylenephosphonate by weight percentage.

[0009] Based on a general inventive concept, this application also provides a method for preparing a flotation separation inhibitor for copper-molybdenum mixed concentrate, comprising the following steps: mixing D-isoascorbic acid and sodium ethylenediaminetetramethylenephosphonate to obtain the copper-molybdenum mixed concentrate flotation separation inhibitor.

[0010] Based on a general inventive concept, this application also provides a mineral processing method for separating copper-molybdenum concentrate, comprising the following steps:

[0011] S1. Pulping: Water is added to the copper-molybdenum mixed concentrate and stirred to obtain a slurry;

[0012] S2. Roughing: Sodium sulfide, copper-molybdenum mixed concentrate flotation separation inhibitor as described above, collector and frother are added sequentially to the slurry to carry out roughing to obtain molybdenum roughing concentrate and copper roughing concentrate.

[0013] S3. Fine treatment: Sodium sulfide and the above-mentioned copper-molybdenum mixed concentrate flotation separation inhibitor are added sequentially to the molybdenum roughing concentrate for fine treatment to obtain molybdenum concentrate.

[0014] S4. Scavenging: Add sodium sulfide, the copper-molybdenum mixed concentrate flotation separation inhibitor as described above, and then add collector and frother to the copper rougher concentrate obtained in step S2 for scavenging to obtain copper concentrate from the flotation tailings.

[0015] Preferably, the coarse selection operation is performed 1 to 2 times, the fine selection operation is performed 5 to 7 times, and the sweeping operation is performed 2 to 3 times.

[0016] Preferably, in each roughing operation, the amount of sodium sulfide added is 1.5~4 kg / t, the amount of inhibitor added is 0.2~0.6 kg / t, the amount of collector added is 0.02~0.06 kg / t, and the amount of frother added is 0.02~0.06 kg / t. In this application, the unit "kg / t" for the amount of each component refers to the mass of the copper-molybdenum mixed concentrate, expressed in tons (t).

[0017] Preferably, in each refining operation, the amount of sodium sulfide added is 0.2~1.5 kg / t; the amount of inhibitor added is 0.01~0.5 kg / t.

[0018] Preferably, the amount of sodium sulfide added in each scavenging operation is 0.8~2 kg / t, the amount of the inhibitor added is 0.02~0.25 kg / t, the amount of the collector added is 0.01~0.03 kg / t, and the amount of the frother added is 0.005~0.02 kg / t.

[0019] Preferably, in each roughing operation, the sodium sulfide is first added and stirred for 5-10 minutes, then the inhibitor is added and stirred for 1-5 minutes, then the collector and frother are added and stirred for 1-5 minutes, and then the foam is scraped for 2-6 minutes.

[0020] As a preferred method, in each refining operation, the sodium sulfide is first added and stirred for 5-10 minutes, then the inhibitor is added and stirred for 1-5 minutes, and then the foam is scraped for 1-4 minutes.

[0021] Preferably, the tailings obtained from each refining operation are carried over to the next step for further flotation separation; as an example, the tailings from the first refining operation are returned to the roughing step, and the tailings from the second refining operation are carried over to the first refining step.

[0022] As a preferred method, after adding the collector and foaming agent in each scavenging operation, stir for 1 to 5 minutes, and then scrape and foam for 1 to 4 minutes.

[0023] Preferably, the flotation foam product obtained from each scavenging operation is carried over to the previous step for further flotation separation; as an example, the flotation foam product obtained from the first scavenging operation is returned to the roughing step, and the flotation foam product obtained from the second scavenging operation is carried over to the first scavenging step.

[0024] Preferably, the grade of molybdenum in the copper-molybdenum mixed concentrate is 0.20% to 3.00%, and the grade of copper is 12.00% to 26.00%.

[0025] Preferably, the mass content of the copper-molybdenum mixed concentrate in the slurry is 25% to 40%.

[0026] The mechanism by which this application achieves flotation separation of copper-molybdenum mixed concentrates is as follows:

[0027] This application uses D-isoascorbic acid and sodium ethylenediaminetetramethylenephosphonate as flotation separation inhibitors for copper-molybdenum mixed concentrates. D-isoascorbic acid is a strong reducing agent that can rapidly reduce elemental sulfur and high-valence metal ions (such as Cu) generated on the surface of chalcopyrite (CuFeS2) due to oxidation or collector adsorption. 2+ This process disrupts the adsorption layer of hydrophobic collectors (such as xanthate), achieving efficient "de-drug removal." Sodium ethylenediaminetetramethylenephosphonate (EDTMPS) is a multidentate organophosphonic acid chelating agent; its four phosphonic acid groups (-PO3H2) can react with the exposed Cu on the surface of chalcopyrite. + / Cu 2+ This forms an extremely stable polynuclear chelate. This robust adsorption layer orients the hydrophilic phosphonic acid groups toward the slurry, causing strong hydrophilicity of the chalcopyrite surface to be deeply suppressed. Neither reagent adsorbs molybdenite. Under the synergistic effect of the two reagents, copper sulfide minerals can be effectively suppressed with a low sodium sulfide dosage, achieving efficient copper-molybdenum separation.

[0028] Compared with the prior art, this application has the following beneficial effects:

[0029] (1) This application achieves efficient separation of molybdenum and copper by using the synergistic inhibition effect of two flotation reagents, first by descaling xanthate and then by strengthening hydrophilicity, and the inhibition effect on molybdenum minerals is relatively small.

[0030] (2) The mineral processing method of this application uses a combination of inhibitors (D-isoascorbic acid and sodium ethylenediaminetetramethylenephosphonate) to inhibit chalcopyrite in the flotation operation. Compared with conventional copper-molybdenum separation inhibitors, it significantly reduces the amount of sodium sulfide used, improves the economic benefits of enterprises, and provides technical support for improving the production environment of enterprises. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0032] Figure 1 This is a process flow diagram of the copper-molybdenum separation and beneficiation method in Example 1 of this application. Detailed Implementation

[0033] The embodiments described in this specification are merely for explaining this application and are not intended to limit this application.

[0034] For simplicity, this paper only explicitly discloses some numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, although not explicitly stated, every point or individual value between the endpoints of a range is included within that range. Therefore, each point or individual value can be used as its own lower or upper limit, combined with any other point or individual value, or combined with other lower or upper limits to form an unspecified range.

[0035] Those skilled in the art will understand that the order in which the steps are written in the various embodiments or examples does not imply a strict execution order and does not limit the implementation process in any way. The detailed execution order of each step should be determined by its function and possible internal logic. Unless otherwise specified, all steps of the present invention may be performed sequentially or randomly, but sequentially is preferred.

[0036] The present application is further illustrated below with reference to embodiments. It should be understood that these embodiments are merely illustrative, as various modifications and variations will be apparent to those skilled in the art within the scope of the disclosure of this application. Unless otherwise stated, all parts, percentages, and ratios reported in the following embodiments are based on mass, and all reagents used in the embodiments are commercially available or synthesized by conventional methods and can be used directly without further processing, and the instruments used in the embodiments are commercially available.

[0037] The experimental raw materials used in the various embodiments and comparative examples of this application are copper-molybdenum mixed concentrates obtained by flotation of a molybdenum-bearing copper mine using xanthate and diesel as collectors. The copper content is 18.53% and the molybdenum content is 0.54%. The process mineralogical study results show that the main metallic minerals in the sample are chalcopyrite, molybdenite and a small amount of pyrite.

[0038] The D-isoascorbic acid used in the examples and comparative examples of this application was purchased from Shandong Luwei Pharmaceutical Co., Ltd., with the molecular formula C6H8O6 and the structural formula as follows.

[0039] .

[0040] Sodium ethylenediaminetetramethylenephosphonate was purchased from Xinghengtai (Wuhan) Chemical Technology Co., Ltd., with the molecular formula C6H. 20 N2NaO 12 P4, the structural formula is as follows:

[0041] .

[0042] Example 1

[0043] See Figure 1 In this embodiment, a copper-molybdenum mixed concentrate is subjected to flotation. The depressant used in this embodiment is a combined depressant formed by mixing D-isoascorbic acid and sodium ethylenediaminetetramethylenephosphonate in a mass ratio of 30.30:69.70. The specific flotation steps are as follows:

[0044] (1) Pulping: Add water to the copper-molybdenum mixed concentrate and stir according to the mineral-water mass ratio of 35:75 to obtain a slurry with a concentration of 35%.

[0045] (2) Roughing: Add 3 kg / t of sodium sulfide to the slurry and stir for 5 min. Then add 0.4 kg / t of combined inhibitor and stir for 3 min. Then add 0.30 kg / t of collector kerosene and 0.02 kg / t of frother No. 2 oil and stir for 1 min. Start roughing and the frothing time is 3 min to obtain molybdenum roughing concentrate and copper roughing concentrate.

[0046] (3) Six cleaning processes: The molybdenum roughing concentrate is cleaned six times in sequence. For each cleaning process, sodium sulfide is added and stirred for 5 minutes, followed by the addition of a combined inhibitor and stirring for 3 minutes before proceeding to the next cleaning process. Specifically, the dosage for the first cleaning process is: 1.2 kg / t of sodium sulfide and 0.2 kg / t of the combined inhibitor; the dosage for the second cleaning process is: 0.9 kg / t of sodium sulfide and 0.15 kg / t of the combined inhibitor; and the dosage for the third cleaning process is: 0.6 kg / t of sodium sulfide and 0.15 kg / t of the combined inhibitor. 0.06 kg / t; the dosage for the fourth cleaning step is: sodium sulfide 0.4 kg / t, combined inhibitor 0.04 kg / t; the dosage for the fifth cleaning step is: sodium sulfide 0.3 kg / t, combined inhibitor 0.02 kg / t; the dosage for the sixth cleaning step is: sodium sulfide 0.15 kg / t, combined inhibitor 0.02 kg / t; molybdenum concentrate is obtained; the tailings from each cleaning step enter the previous step, for example, the tailings from the first cleaning step enter the roughing step, and the tailings from the second cleaning step enter the first cleaning step.

[0047] (4) Two scavenging processes: Add 1.2 kg / t of sodium sulfide and 0.15 kg / t of combined depressant to the copper rougher concentrate obtained in step (2), stir for 5 min, then add 0.02 kg / t of collector kerosene and 0.02 kg / t of No. 2 kerosene, stir for 1 min to complete the first scavenging process; then add 0.8 kg / t of sodium sulfide and 0.1 kg / t of combined depressant, add 0.01 kg / t of collector kerosene and 0.01 kg / t of No. 2 kerosene, stir for 1 min to complete the second scavenging process and obtain copper concentrate; wherein, the flotation froth product obtained in each scavenging process enters the previous step.

[0048] Comparative Example 1

[0049] The flotation sample in this comparative example is the same as that in Example 1, and the flotation method is basically the same as that in Example 1. The main difference is that no combined depressant was added during the roughing and cleaning steps of the molybdenum roughing concentrate. Specifically, the roughing steps and six cleaning steps in this comparative example are as follows:

[0050] (1) Roughing: Add 12 kg / t of sodium sulfide to the slurry and stir for 5 min; then add 0.30 kg / t of collector kerosene and 0.02 kg / t of frother No. 2 oil and stir for 1 min to start roughing. The frothing time is 3 min to obtain molybdenum roughing concentrate and copper roughing concentrate.

[0051] (2) Six cleaning processes: The molybdenum roughing concentrate is cleaned six times in sequence. Sodium sulfide is added and stirred for 5 minutes in each cleaning process before proceeding to the next cleaning process. The amount of sodium sulfide used in cleaning operations one, two, three, four, five and six is ​​2.5 kg / t, 1.5 kg / t, 1 kg / t, 0.50 kg / t, 0.30 kg / t and 0.20 kg / t, respectively.

[0052] (3) Two scavenging processes: Add 4 kg / t of sodium sulfide to the copper roughing concentrate obtained in step (2), stir for 5 min, then add 0.02 kg / t of collector kerosene and 0.02 kg / t of No. 2 kerosene, stir for 1 min to complete the first scavenging process; then add 2 kg / t of sodium sulfide and stir for 5 min, then add 0.01 kg / t of collector kerosene and 0.01 kg / t of No. 2 kerosene, stir for 1 min to complete the second scavenging process and obtain copper concentrate; wherein, the flotation froth product obtained in each scavenging process enters the previous step.

[0053] Other flotation process parameters are the same as in Example 1.

[0054] Comparative Example 2

[0055] The flotation sample in this comparative example is the same as that in Example 1, and the flotation method is basically the same as that in Example 1. The main difference is that in the roughing and cleaning steps of the molybdenum roughing concentrate, the combined depressant in this comparative example is replaced with sodium mercaptoacetate. Specifically, the roughing steps and six cleaning steps in this comparative example are as follows:

[0056] (1) Roughing: Add 9 kg / t of sodium sulfide to the slurry and stir for 5 min. Then add 0.5 kg / t of sodium mercaptoacetate and stir for 3 min. Then add 0.30 kg / t of collector kerosene and 0.02 kg / t of frother No. 2 oil and stir for 1 min. Start roughing and the frothing time is 3 min to obtain molybdenum roughing concentrate and copper roughing concentrate.

[0057] (2) Six-stage cleaning: The molybdenum roughing concentrate was cleaned six times in sequence. For each cleaning, sodium sulfide was added and stirred for 5 minutes, followed by sodium mercaptoacetate and stirred for 3 minutes before proceeding to the next cleaning. Specifically, the dosage of reagents added for the first cleaning was: 1.8 kg / t of sodium sulfide and 0.30 kg / t of sodium mercaptoacetate; the dosage of reagents added for the second cleaning was: 1.2 kg / t of sodium sulfide and 0.12 kg / t of sodium mercaptoacetate; the dosage of reagents added for the third cleaning was: 0.75 kg / t of sodium sulfide and 0.08 kg / t of sodium mercaptoacetate; the dosage of reagents added for the fourth cleaning was: 0.3 kg / t of sodium sulfide and 0.06 kg / t of sodium mercaptoacetate; the dosage of reagents added for the fifth cleaning was: 0.20 kg / t of sodium sulfide and 0.05 kg / t of sodium mercaptoacetate; and the dosage of reagents added for the sixth cleaning was: 0.15 kg / t of sodium sulfide and 0.03 kg / t of sodium mercaptoacetate. Molybdenum concentrate was obtained.

[0058] (3) Add 3 kg / t of sodium sulfide and 0.5 kg / t of sodium mercaptoacetate to the copper rougher concentrate obtained in step (2), stir for 5 min, then add 0.02 kg / t of collector kerosene and 0.02 kg / t of No. 2 kerosene, stir for 1 min to complete the first scavenging; then add 1 kg / t of sodium sulfide and 0.1 kg / t of sodium mercaptoacetate, stir for 5 min; add 0.01 kg / t of collector kerosene and 0.01 kg / t of No. 2 kerosene, stir for 1 min to complete the second scavenging and obtain copper concentrate; wherein, the flotation froth product obtained in each scavenging enters the previous step.

[0059] Other flotation process parameters are the same as in Example 1.

[0060] Comparative Example 3

[0061] The flotation sample in this comparative example is the same as that in Example 1, and the flotation method is basically the same as that in Example 1. The main difference is that the inhibitor used in this comparative example is sodium ethylenediaminetetramethylenephosphonate in the roughing and cleaning steps of the molybdenum roughing concentrate. Specifically, the roughing steps and six cleaning steps in this comparative example are as follows:

[0062] (1) Roughing: Add 3 kg / t of sodium sulfide to the slurry and stir for 5 min. Then add 1.00 kg / t of sodium ethylenediaminetetramethylenephosphonate and stir for 3 min. Then add 0.30 kg / t of collector kerosene and 0.02 kg / t of frother No. 2 oil and stir for 1 min. Start roughing and skim for 3 min to obtain molybdenum roughing concentrate and copper roughing concentrate.

[0063] (2) Six-stage cleaning: The molybdenum roughing concentrate is sequentially cleaned six times. For each cleaning, sodium sulfide is added and stirred for 5 minutes, followed by sodium ethylenediaminetetramethylenephosphonate and stirred for 3 minutes before proceeding to the next cleaning stage. Specifically, the dosage for the first cleaning is: sodium sulfide 1.2 kg / t, sodium ethylenediaminetetramethylenephosphonate 0.2 kg / t; the dosage for the second cleaning is: sodium sulfide 0.9 kg / t, sodium ethylenediaminetetramethylenephosphonate 0.15 kg / t; the dosage for the third cleaning is: sodium sulfide 0.6 kg / t, sodium ethylenediaminetetramethylenephosphonate 0.15 kg / t. Sodium methylphosphonate 0.06 kg / t; the dosage for the fourth cleaning step is: sodium sulfide 0.4 kg / t, combined inhibitor 0.04 kg / t; the dosage for the fifth cleaning step is: sodium sulfide 0.3 kg / t, sodium ethylenediaminetetramethylenephosphonate 0.02 kg / t; the dosage for the sixth cleaning step is: sodium sulfide 0.15 kg / t, sodium ethylenediaminetetramethylenephosphonate 0.02 kg / t; molybdenum concentrate is obtained; the tailings from each cleaning step enter the previous step, for example, the tailings from the first cleaning step enter the roughing step, and the tailings from the second cleaning step enter the first cleaning step.

[0064] (3) Two scavenging processes: Add 1.2 kg / t of sodium sulfide and 0.15 kg / t of sodium ethylenediaminetetramethylenephosphonate to the copper rougher concentrate obtained in step (2), stir for 5 min, add 0.02 kg / t of collector kerosene and 0.02 kg / t of No. 2 kerosene, stir for 1 min to complete the first scavenging process; then add 0.8 kg / t of sodium sulfide and 0.1 kg / t of sodium ethylenediaminetetramethylenephosphonate, stir for 5 min, add 0.01 kg / t of collector kerosene and 0.01 kg / t of No. 2 kerosene, stir for 1 min to complete the second scavenging process and obtain copper concentrate; wherein, the flotation froth product obtained in each scavenging process enters the previous step.

[0065] Other flotation process parameters are the same as in Example 1.

[0066] The results are shown in Table 1.

[0067] Table 1

[0068]

[0069] The yield calculation methods for molybdenum concentrate and copper concentrate in the table are as follows:

[0070] γ 精 =QK / Qn*100%, γ 尾 =100-γ 精

[0071] In the formula: Qn is the total weight of molybdenum concentrate and copper concentrate, in grams; QK is the weight of molybdenum concentrate; γ 精 γ represents the molybdenum concentrate yield, and γ tail represents the copper concentrate yield.

[0072] The grades of Mo and Cu in molybdenum concentrate and copper concentrate were obtained through analytical testing.

[0073] The recovery rates of Mo and Cu elements in molybdenum concentrate and copper concentrate are calculated as follows: ε = γ × β / α × 100%, where: ε is the recovery rate (%) of a certain component in the product; α is the grade (%) of this component in the raw ore; β is the grade (%) of this component in the product; and γ is the yield (%) of the product.

[0074] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A flotation separation inhibitor for copper-molybdenum mixed concentrate, characterized in that, Including D-isoascorbic acid and sodium ethylenediaminetetramethylenephosphonate.

2. The copper-molybdenum mixed concentrate flotation separation inhibitor according to claim 1, characterized in that, It contains 25-35% D-isoascorbic acid and sodium ethylenediaminetetramethylenephosphonate by weight percentage.

3. The method for preparing the flotation separation inhibitor of copper-molybdenum mixed concentrate according to any one of claims 1 to 2, characterized in that, D-isoascorbic acid and sodium ethylenediaminetetramethylenephosphonate were mixed to obtain the flotation separation inhibitor for the copper-molybdenum mixed concentrate.

4. A mineral processing method for separating copper-molybdenum concentrate, characterized in that, Includes the following steps: S1. Pulping: Water is added to the copper-molybdenum mixed concentrate and stirred to obtain a slurry; S2. Roughing: Sodium sulfide, inhibitor as described in any one of claims 1 to 2, collector and frother are added sequentially to the slurry to perform roughing to obtain molybdenum roughing concentrate and copper roughing concentrate. S3. Fine cleaning: Sodium sulfide and the inhibitor as described in any one of claims 1 to 2 are added sequentially to the molybdenum roughing concentrate for fine cleaning to obtain molybdenum concentrate; S4. Scavenging: Sodium sulfide, the inhibitor as described in claims 1-2, collector and frother are added sequentially to the copper rougher concentrate obtained in step S2, and scavenging is performed to obtain copper concentrate from the flotation tailings.

5. The mineral processing method according to claim 4, characterized in that, The collector is kerosene, and the foaming agent is No. 2 oil.

6. The mineral processing method according to claim 4, characterized in that, The number of coarse selection operations is 1 to 2 times, the number of fine selection operations is 5 to 7 times, and the number of sweeping operations is 2 to 3 times.

7. The mineral processing method according to claim 4, characterized in that, The mineral processing method satisfies at least one of the following conditions: (1) In each roughing operation, the amount of sodium sulfide added is 1.5~4 kg / t, the amount of inhibitor added is 0.2~0.6 kg / t, the amount of collector added is 0.02~0.06 kg / t, and the amount of foaming agent added is 0.02~0.06 kg / t; (2) In each refining operation, the amount of sodium sulfide added is 0.2~1.5 kg / t; the amount of inhibitor added is 0.01~0.5 kg / t; (3) In each scavenging operation, the amount of sodium sulfide added is 0.8~2 kg / t, the amount of inhibitor added is 0.02~0.25 kg / t, the amount of collector added is 0.01~0.03 kg / t, and the amount of foaming agent added is 0.005~0.02 kg / t.

8. The mineral processing method according to claim 7, characterized in that, The mineral processing method satisfies at least one of the following conditions: (1) In each roughing operation, first add the sodium sulfide and stir for 5-10 minutes, then add the inhibitor and stir for 1-5 minutes, then add the collector and frother and stir for 1-5 minutes, then scrape the foam for 2-6 minutes; (2) In each fine selection operation, first add the sodium sulfide and stir for 5 to 10 minutes, then add the inhibitor and stir for 1 to 5 minutes, and then scrape the foam for 1 to 4 minutes; (3) In each sweeping operation, after adding the collector and foaming agent, stir for 1 to 5 minutes, and then scrape and foam for 1 to 4 minutes.

9. The mineral processing method according to claim 4, characterized in that, The grade of molybdenum in the copper-molybdenum mixed concentrate is 0.20% to 3.00%, and the grade of copper is 12.00% to 26.00%.

10. The mineral processing method according to claim 4, characterized in that, The copper-molybdenum mixed concentrate in the slurry has a mass content of 25% to 40%.

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