Copper-molybdenum mixed concentrate flotation combined inhibitor and application thereof

Abstract

The application discloses application of a combined inhibitor of copper-molybdenum mixed concentrate in copper-molybdenum flotation separation. The application firstly carries out fine grinding and medicine removing on the copper-molybdenum mixed concentrate; adds the combined inhibitor to inhibit chalcopyrite during the fine grinding process; then adds a collector and a foaming agent to obtain a molybdenum rough concentrate and a copper rough concentrate through roughing; the molybdenum rough concentrate is obtained after being refined, and the copper rough concentrate is obtained after being scanned. The combined inhibitor comprises thiosemicarbazide and thiolactic acid. The dosages of the water-soluble thiosemicarbazide and the thiolactic acid are 0.2-0.5 kg and 0.1-0.2 kg respectively per ton of the copper-molybdenum mixed concentrate. The application can replace the use of toxic inhibitors to reduce environmental pollution, and significantly improve the flotation separation efficiency of copper and molybdenum, and realize efficient separation of copper and molybdenum concentrates.

Description

TECHNICAL FIELD

[0001] The application relates to application of a combined inhibitor in flotation separation of copper-molybdenum mixed concentrate and belongs to the technical field of copper-molybdenum sulfide ore separation. BACKGROUND

[0002] Copper and molybdenum are both important metal materials with practical values. The high conductivity and heat conductivity of copper make it widely used in the fields of electricity, construction and manufacturing. Molybdenum is an important strategic resource, which is widely used in the manufacturing of high-temperature equipment and electronic components due to its excellent high-temperature resistance and corrosion resistance, and provides key support for the fields of aviation and aerospace. However, the separation of copper and molybdenum minerals has been a big problem in mineral separation because the two minerals are closely associated and have similar floatability. At present, there are two process flows for the separation of copper-molybdenum mixed concentrate at home and abroad: molybdenum flotation with copper inhibition and copper flotation with molybdenum inhibition. Due to the good natural floatability of molybdenum ore, the process flow of molybdenum flotation with copper inhibition is basically adopted in practice. The commonly used copper inhibitors can be divided into three categories: (1) inorganic inhibitors, the commonly used reagents are cyanide and Knox reagent. The principle of this kind of inhibitor is that the ions dissolved in water after the reagent is dissolved are adsorbed on the surface of copper minerals, increasing the hydrophilicity of the surface of copper minerals, but there is no obvious effect on molybdenum minerals. Although this inhibitor has the advantages of good inhibition effect and small dosage, it is limited in application due to its own toxicity and great pollution to the environment. (2) Organic inhibitors, sodium hydrosulfide (HSCH2COONa) is a new type of organic inhibitor for copper separation in recent years. The -HS group and -COOH group in the molecule are adsorbed on the surface of copper minerals to form a hydrophilic film, increasing the hydrophilicity of the surface of copper minerals. However, the high cost of sodium hydrosulfide has been restricting its promotion. (3) Oxidizing agents, the commonly used oxidizing agents are hydrogen peroxide, sodium hypochlorite and potassium permanganate. In the flotation process, the strong reducing property of xanthate is used to oxidize the xanthate adsorbed on the surface of copper minerals by using oxidizing agents to generate over-xanthate Cu(C2H5OCSSO)2 which has no collecting property, so as to achieve the effect of copper inhibition. However, due to its strong oxidizing property, it is easy to corrode and the cost of the reagent is also high, and the addition method and location of the oxidizing agent also need to be studied.

[0003] Due to the many problems existing in the current copper-molybdenum separation method and reagent, the separation effect of copper-molybdenum mixed concentrate in China is not good, so it is urgent to find a non-toxic and harmless, simple to use and strong separation effect selective inhibitor and flotation separation process. SUMMARY

[0004] In view of the deficiencies of the prior art, the application aims to provide a low-toxicity, harmless, selective and strong separation effect chalcopyrite combined inhibitor and its application in the flotation process.

[0005] To achieve the above object, the application provides a combined inhibitor for flotation separation of copper-molybdenum mixed concentrate, which comprises thiosemicarbazide and thiolactic acid.

[0006] The combined inhibitor for flotation separation of copper-molybdenum mixed concentrate comprises thiosemicarbazide and thiolactic acid, and the mass ratio of the thiosemicarbazide to the thiolactic acid is 2-5:1-2, preferably.

[0007] The combined inhibitor for flotation separation of copper-molybdenum mixed concentrate, in terms of per ton of copper-molybdenum mixed concentrate, comprises thiosemicarbazide and thiolactic acid, and the dosages of the thiosemicarbazide and the thiolactic acid in rough separation of the copper-molybdenum mixed concentrate are 0.2-0.5 kg and 0.1-0.2 kg, respectively.

[0008] The application of the combined inhibitor for flotation separation of copper-molybdenum mixed concentrate comprises the following steps:

[0009] The application of the combined inhibitor for flotation separation of copper-molybdenum mixed concentrate comprises the following steps:

[0010] (1) The combined inhibitor is mixed with the copper-molybdenum mixed concentrate and finely ground, and a collecting agent and a foaming agent are added to the slurry after the fine grinding, and a concentrate obtained by the rough separation is a molybdenum rough concentrate, and a tailing is a copper rough concentrate;

[0011] (2) The molybdenum rough concentrate is subjected to 2-4 times of cleaning, and the combined inhibitor is added to each cleaning, and a cleaning concentrate is a molybdenum concentrate; the copper rough concentrate is subjected to 2-3 times of scavenging, and a collecting agent is added to each scavenging, and a scavenging tailing is a copper concentrate.

[0012] The application of the combined inhibitor for flotation separation of copper-molybdenum mixed concentrate comprises the following steps:

[0013] The application of the combined inhibitor for flotation separation of copper-molybdenum mixed concentrate comprises the following steps:

[0014] The application of the combined inhibitor for flotation separation of copper-molybdenum mixed concentrate comprises the following steps:

[0015] The application of the combined inhibitor for flotation separation of copper-molybdenum mixed concentrate comprises the following steps:

[0016] In the present application, adding the depressant during grinding is beneficial to the close combination of the copper and iron sites freshly exposed on the chalcopyrite surface and the depressant, thereby improving the depression effect.

[0017] In the present application, thiolactic acid is easy to cause unstable foam, and therefore the amount of thiolactic acid in the combined depressant is appropriately reduced compared to the amount of thiosemicarbazide.

[0018] In the application of the combined depressant for the flotation separation of copper-molybdenum mixed concentrate, in the first-stage cleaning, thiosemicarbazide is added at a ratio of 80-170 g, preferably 95-155 g, per ton of copper-molybdenum mixed concentrate, and thiolactic acid is added at a ratio of 65-110 g, preferably 70-105 g, per ton of copper-molybdenum mixed concentrate, and the amount of thiolactic acid is less than that of thiosemicarbazide.

[0019] In the second-stage cleaning, thiosemicarbazide is added at a ratio of 40-90 g, preferably 50-80 g, per ton of copper-molybdenum mixed concentrate, and thiolactic acid is added at a ratio of 25-60 g, preferably 30-55 g, per ton of copper-molybdenum mixed concentrate, and the amount of thiolactic acid is less than that of thiosemicarbazide.

[0020] In the third-stage cleaning, thiosemicarbazide is added at a ratio of 20-50 g, preferably 22-42 g, per ton of copper-molybdenum mixed concentrate, and thiolactic acid is added at a ratio of 13-22 g, preferably 14-21 g, per ton of copper-molybdenum mixed concentrate, and the amount of thiolactic acid is less than that of thiosemicarbazide.

[0021] In the application of the combined depressant for the flotation separation of copper-molybdenum mixed concentrate, the ratio of thiosemicarbazide to thiolactic acid in the second-stage cleaning is greater than that in the first-stage cleaning.

[0022] The ratio of thiosemicarbazide to thiolactic acid in the third-stage cleaning is greater than that in the second-stage cleaning.

[0023] In the application of the combined depressant for the flotation separation of copper-molybdenum mixed concentrate, the ratio of thiosemicarbazide to thiolactic acid in the cleaning process is preferably 1.33-1.67.

[0024] In the application of the combined depressant for the flotation separation of copper-molybdenum mixed concentrate, the amount of the combined depressant in the cleaning is 0.1-0.5 times the amount used in the roughing.

[0025] In the application of the combined depressant for the flotation separation of copper-molybdenum mixed concentrate, the amount of the combined depressant in the cleaning is 0.1-0.5 times the amount used in the roughing.

[0026] The application of the combined inhibitor for the flotation separation of copper-molybdenum mixed concentrate, the action time of the flotation reagent is 2-3 minutes, the bubble scraping time of the flotation is 3-5 minutes, and the rotation speed of the flotation machine is adjusted to 1800-1900 r / min.

[0027] The application is used for the flotation separation of copper-molybdenum, and has the following advantages:

[0028] Firstly, the appropriate amount of thiosemicarbazide in the combined inhibitor cooperates with thiolactic acid to strengthen the inhibition effect of chalcopyrite, and the specific performance is as follows: (1) thiosemicarbazide has three amino groups, and has strong combination ability with copper and iron sites, can form coordination adsorption on the surface of chalcopyrite, and is not easy to be desorbed; (2) the mercapto group in thiolactic acid further forms chemical adsorption with the copper sites on the surface of chalcopyrite which are not coordinated, thereby strengthening the inhibition effect; and (3) the two kinds of inhibitors in the appropriate proportion and appropriate amount can form complementary advantages, and can form a dense hydrophilic layer on the surface of chalcopyrite to block the action of the collectors.

[0029] Secondly, the dosage of thiolactic acid needs to be large when it is added alone, and the foam is unstable, and the dosage of the reagent can be greatly reduced by cooperating with thiosemicarbazide, thereby ensuring the stability of the foam.

[0030] Thirdly, thiosemicarbazide and thiolactic acid have almost no inhibition effect on molybdenite, and have good selectivity and strong applicability.

[0031] Fourthly, the combined inhibitor can more flexibly cope with various complex copper-molybdenum minerals, such as high-copper and low-molybdenum mixed concentrate, low-copper and high-molybdenum mixed concentrate, and the like, and has strong applicability.

[0032] Fifthly, the combined inhibitor is non-toxic and environmentally friendly, is beneficial to the subsequent wastewater treatment or reuse of the concentrator, and well protects the ecological benefits of the surrounding of the concentrator. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The process flow chart for the small closed-circuit test of copper-molybdenum separation by adopting the application is shown. DETAILED DESCRIPTION

[0034] The application will be further described below in combination with examples, but is not limited to the application.

[0035] Example 1

[0036] The copper content in the test raw material (copper-molybdenum mixed concentrate, particle size of 68% of 200 mesh) is 21.82 wt%, the molybdenum content is 0.77 wt%, and the process mineralogy research result shows that the main metal minerals in the sample are chalcopyrite, molybdenite and pyrite. The combined inhibitor for the flotation separation of copper-molybdenum mixed concentrate provided by the application is used to perform a laboratory small closed-circuit test on the ore sample, and the specific steps of the test are as follows:

[0037] 1) adding 300g / t of thiosemicarbazide and 200g / t of thiolactic acid to the copper-molybdenum mixed concentrate, ball milling to a grinding fineness of 90% passing 400 mesh (grinding concentration of 50%); then adding 250g / t of kerosene and 80g / t of MIBC, roughing once; obtaining a rough concentrate and a rough tailing; the flotation reagent action time is 2 minutes; the flotation scraping time is 3 minutes; the flotation machine rotation speed is adjusted to 1800r / min;

[0038] 2) rough tailing after roughing is subjected to two times of scavenging, adding 100g / t of kerosene in scavenging 1, adding 50g / t of kerosene in scavenging 2, and using the scavenging tailing as a copper concentrate;

[0039] 3) rough concentrate after roughing is subjected to three times of cleaning, adding 150g / t of thiosemicarbazide and 100g / t of thiolactic acid in cleaning 1, adding 80g / t of thiosemicarbazide and 50g / t of thiolactic acid in cleaning 2, adding 40g / t of thiosemicarbazide and 20g / t of thiolactic acid in cleaning 3, and using the cleaning concentrate as a molybdenum concentrate; single cleaning, the flotation reagent action time is 2 minutes; the flotation scraping time is 3 minutes; the flotation machine rotation speed is adjusted to 1800r / min;

[0040] The test results are shown in Table 1.

[0041] As can be seen from the test results, by using the combined inhibitor and the use method thereof provided by the present application, a molybdenum concentrate with a molybdenum grade of 49.74% and a copper content of only 1.49% and a molybdenum recovery rate of 92.32%, and a copper concentrate with a copper grade of 22.12% and a molybdenum content of only 0.060% and a copper recovery rate of 99.90% can be obtained in the laboratory small-scale closed-circuit test.

[0042] Table 1

[0043]

[0044] Example 2

[0045] The copper content in the test raw material (copper-molybdenum mixed concentrate, particle size of 65% passing 200 mesh) is 19.03wt%, and the molybdenum content is 3.81wt%, and the process mineralogy research results show that the main metal minerals in the sample are chalcopyrite, bornite, molybdenite and pyrite. A combined inhibitor for copper-molybdenum mixed concentrate flotation separation provided by the present application is used to carry out a laboratory small-scale closed-circuit test on the ore sample, and the test specific steps are as follows:

[0046] 1) adding 200 g / t of thiosemicarbazide and 150 g / t of thiolactic acid to the copper-molybdenum mixed concentrate, and ball milling to a grinding fineness of 85% passing 400 mesh (grinding concentration of 50%); then adding 400 g / t of kerosene and 150 g / t of MIBC, and performing one roughing; obtaining a rough concentrate and a rough tailing; the flotation reagent action time is 2 min; the flotation scraping time is 3 min; and the flotation machine rotating speed is adjusted to 1800 r / min;

[0047] 2) performing two scavengings on the rough tailing after the roughing, adding 150 g / t of kerosene in the first scavenging, and adding 80 g / t of kerosene in the second scavenging, and taking the scavenging tailing as a copper concentrate;

[0048] 3) performing three cleanings on the rough concentrate after the roughing, adding 100 g / t of thiosemicarbazide and 75 g / t of thiolactic acid in the first cleaning, adding 50 g / t of thiosemicarbazide and 35 g / t of thiolactic acid in the second cleaning, and adding 25 g / t of thiosemicarbazide and 15 g / t of thiolactic acid in the third cleaning, and taking the cleaning concentrate as a molybdenum concentrate; the single cleaning, the flotation reagent action time is 2 min; the flotation scraping time is 3 min; and the flotation machine rotating speed is adjusted to 1800 r / min;

[0049] The test results are shown in Table 2.

[0050] As can be seen from the test results, by using the combined depressant and the use method thereof provided in the present application, the laboratory small closed-circuit test can obtain a molybdenum concentrate with a molybdenum grade of 47.35% and a copper content of only 1.38%, a molybdenum recovery rate of 97.49%; and a copper concentrate with a copper grade of 20.53% and a molybdenum content of only 0.10%, a copper recovery rate of 99.43%.

[0051] Table 2

[0052]

[0053] Example 3

[0054] The other conditions are consistent with those in Example 2, except that:

[0055] 1) adding 200 g / t of thiosemicarbazide and 150 g / t of thiolactic acid to the copper-molybdenum mixed concentrate, and ball milling to a grinding fineness of 85% passing 400 mesh (grinding concentration of 50%); then adding 400 g / t of kerosene and 150 g / t of MIBC, and performing one roughing; obtaining a rough concentrate and a rough tailing;

[0056] 2) performing two scavengings on the rough tailing after the roughing, adding 150 g / t of kerosene in the first scavenging, and adding 80 g / t of kerosene in the second scavenging, and taking the scavenging tailing as a copper concentrate;

[0057] 3) the rough concentrate after roughing is subjected to three times of cleaning, 100 g / t of thiosemicarbazide and 75 g / t of thiolactic acid are added in cleaning 1, 50 g / t of thiosemicarbazide and 37 g / t of thiolactic acid are added in cleaning 2, and 25 g / t of thiosemicarbazide and 18 g / t of thiolactic acid are added in cleaning 3, and the cleaning concentrate is used as a molybdenum concentrate.

[0058] The test results are shown in Table 3.

[0059] It can be seen from the test results that, by using the combined inhibitor and the use method thereof, a molybdenum concentrate with a molybdenum grade of 44.22% and a copper content of only 3.16% and a molybdenum recovery rate of 95.67% can be obtained in a laboratory small-scale closed-circuit test; a copper concentrate with a copper grade of 20.50% and a molybdenum content of only 0.18% and a copper recovery rate of 98.63% can be obtained.

[0060] Table 3

[0061]

[0062] Example 4

[0063] The copper content in the test raw material (a copper-molybdenum mixed concentrate, with a particle size of 70% passing 200 mesh) is 4.04 wt%, and the molybdenum content is 42.86 wt%, and the process mineralogy research results show that the main metal minerals in the sample are molybdenite, chalcopyrite and pyrite. A combined inhibitor for flotation separation of a copper-molybdenum mixed concentrate provided by the present application is used to perform a laboratory small-scale closed-circuit test on the ore sample, and the specific steps of the test are as follows:

[0064] 1) 200 g / t of thiosemicarbazide and 150 g / t of thiolactic acid are added to the copper-molybdenum mixed concentrate, and ball milling is performed to a grinding fineness of 82% passing 400 mesh (the grinding concentration is 50%); then 600 g / t of kerosene and 150 g / t of No. 2 oil are added, and roughing is performed once; a rough concentrate and a rough tailing are obtained; the flotation reagent action time is 2 min; the flotation scraping bubble time is 3 min; and the rotation speed of the flotation machine is adjusted to 1800 r / min;

[0065] 2) the rough tailing after roughing is subjected to two times of scavenging, 200 g / t of kerosene is added in scavenging 1, and 100 g / t of kerosene is added in scavenging 2, and the scavenging tailing is used as a copper concentrate;

[0066] 3) the rough concentrate after roughing is subjected to three times of cleaning, 100 g / t of thiosemicarbazide and 75 g / t of thiolactic acid are added in cleaning 1, 50 g / t of thiosemicarbazide and 37 g / t of thiolactic acid are added in cleaning 2, and 25 g / t of thiosemicarbazide and 18 g / t of thiolactic acid are added in cleaning 3, and the cleaning concentrate is used as a molybdenum concentrate. In each cleaning, the flotation reagent action time is 2 min; the flotation scraping bubble time is 3 min; and the rotation speed of the flotation machine is adjusted to 1800 r / min;

[0067] The test results are shown in Table 4.

[0068] As can be seen from the test results, by using the combined depressant and the method thereof, the laboratory small-scale closed-circuit test can obtain a molybdenum concentrate with a molybdenum grade of 51.68% and a copper content of only 0.36%, a molybdenum recovery rate of 99.54%; a copper concentrate with a copper grade of 21.44% and a molybdenum content of only 1.13%, a copper recovery rate of 92.64%.

[0069] Table 4

[0070]

[0071] Comparative Example 1

[0072] For the ore sample in Example 1, under the condition of keeping the process structure and the total dosage of reagents unchanged, the thiolactic acid in the combined depressant provided by the application is removed, and the laboratory small-scale closed-circuit test is carried out on the ore, and the specific steps are as follows:

[0073] 1) 300 g / t of thiosemicarbazide is added to the copper-molybdenum mixed concentrate, and fine grinding is carried out to a grinding fineness of 90% passing 400 mesh. Then 250 g / t of kerosene and 80 g / t of MIBC are added, and once roughing is carried out; the rough concentrate and the rough tailings are obtained;

[0074] 2) The rough tailings after roughing are subjected to twice scavenging, 100 g / t of kerosene is added in the first scavenging, and 50 g / t of kerosene is added in the second scavenging, and the scavenging tailings are used as the copper concentrate;

[0075] 3) The rough concentrate after roughing is subjected to three times of cleaning, 150 g / t of thiosemicarbazide is added in the first cleaning, 80 g / t of thiosemicarbazide is added in the second cleaning, and 40 g / t of thiosemicarbazide is added in the third cleaning, and the cleaning concentrate is used as the molybdenum concentrate.

[0076] The test results are shown in Table 5.

[0077] As can be seen from the test results, after the combined depressant removes the thiolactic acid, the laboratory small-scale closed-circuit test can obtain a molybdenum concentrate with a molybdenum grade of 30.26% and a molybdenum recovery rate of 80.85%, and the copper content is 5.12%; the copper concentrate has a copper grade of 22.21% and a copper recovery rate of 99.52%, and the molybdenum content is 0.15%. It is found by comparison that the inhibition effect of the combined depressant on copper is obviously weakened after the thiolactic acid is removed, and the obtained molybdenum concentrate has a lower grade and a higher copper content.

[0078] Table 5

[0079]

[0080] Comparative Example 2

[0081] The combined inhibitor provided by the present application is removed for the ore sample in Example 1, and a laboratory small closed-circuit test is carried out for the ore under the condition of keeping the process structure and the total dosage of reagents, and the specific steps of the test are as follows:

[0082] 1) 200 g / t of thio lactic acid is added to the copper-molybdenum mixed concentrate, and fine grinding is carried out to a grinding fineness of 90% passing 400 mesh. Then 250 g / t of kerosene and 80 g / t of MIBC are added, and one roughing is carried out; and a rough concentrate and a rough tailing are obtained;

[0083] 2) The rough tailing after roughing is subjected to two scavengings, 100 g / t of kerosene is added in the first scavenging, and 50 g / t of kerosene is added in the second scavenging, and the scavenging tailing is used as a copper concentrate;

[0084] 3) The rough concentrate after roughing is subjected to three cleanings, 100 g / t of thio lactic acid is added in the first cleaning, 50 g / t of thio lactic acid is added in the second cleaning, and 20 g / t of thio lactic acid is added in the third cleaning, and the cleaning concentrate is used as a molybdenum concentrate.

[0085] The test results are shown in Table 6.

[0086] As can be seen from the test results, after the combined inhibitor is removed from the thiosemicarbazide, the laboratory small closed-circuit test can obtain a molybdenum concentrate with a molybdenum grade of 24.26%, a molybdenum recovery rate of 76.82%, and a copper content of 6.47%; the copper concentrate has a copper grade of 22.03% and a molybdenum content of 0.18%, and a copper recovery rate of 99.28%. It is found by comparison that the inhibition effect of the combined inhibitor on copper is obviously weakened after the thiosemicarbazide is removed, the obtained molybdenum concentrate has a lower grade and a higher copper content; and the grade and the recovery rate of the copper concentrate are both reduced.

[0087] Table 6

[0088]

[0089] Comparative Example 3

[0090] The other conditions are the same as those in Example 3, and the difference is that:

[0091] 1) 100 g / t of thiosemicarbazide is added to the copper-molybdenum mixed concentrate, and fine grinding is carried out to a grinding fineness of 85% passing 400 mesh. Then 400 g / t of kerosene and 150 g / t of MIBC are added, and one roughing is carried out; and a rough concentrate and a rough tailing are obtained;

[0092] 2) The rough tailing after roughing is subjected to two scavengings, 150 g / t of kerosene is added in the first scavenging, and 80 g / t of kerosene is added in the second scavenging, and the scavenging tailing is used as a copper concentrate;

[0093] 3) The rough concentrate after roughing is subjected to three times of cleaning, 150 g / t of thio-lactic acid is added in cleaning 1, 50 g / t of thio-lactic acid is added in cleaning 2, and 15 g / t of thio-urea is added in cleaning 3, and the cleaning concentrate is used as molybdenum concentrate.

[0094] The test results are shown in Table 7.

[0095] From the test results, it can be seen that after the combined depressant is split and added separately in different operation sections, the laboratory small closed-circuit test can obtain a molybdenum concentrate with a molybdenum grade of 31.63%, a molybdenum recovery rate of 86.98%, and a copper content of 10.29%; the copper concentrate has a copper grade of 20.12% and a molybdenum content of 0.56%, and the copper recovery rate is 94.29%. It is found by comparison that after the combined depressant is split, the depression effect on copper is affected, and the recovery rates of copper and molybdenum are both reduced.

[0096] Table 7

[0097]

Claims

1. Use of a combination depressant for the flotation separation of copper-molybdenum bulk concentrates, characterized in that: It comprises the following steps: (1) Mix the combined inhibitor with copper-molybdenum mixed concentrate and fine grind, add collector and frother to the slurry after fine grinding, and obtain molybdenum rough concentrate and copper rough concentrate through roughing; (2) Conduct 2-4 times of cleaning on the molybdenum rough concentrate, add the combined inhibitor each time, and obtain molybdenum concentrate through cleaning; conduct 2-3 times of scavenging on the copper rough concentrate, add collector each time, and obtain copper concentrate through scavenging; The combined inhibitor comprises thiosemicarbazide and thiolactic acid, and the mass ratio of the thiosemicarbazide to the thiolactic acid is 2-5:1-2.

2. Use of a combined depressant for the flotation separation of copper-molybdenum bulk concentrates according to claim 1, characterized in that: The combined inhibitor is used in the amount of 0.2-0.5 kg of thiosemicarbazide and 0.1-0.2 kg of thiolactic acid per ton of copper-molybdenum mixed concentrate in the roughing of copper-molybdenum mixed concentrate flotation separation.

3. Use of a combined depressant for the flotation separation of copper-molybdenum bulk concentrates according to claim 1, characterized in that: The fine grinding fineness is 80%-95% of -400 mesh.

4. The application of the combined inhibitor for copper-molybdenum mixed concentrate flotation separation according to claim 1, characterized in that: The collector is one of diesel oil and kerosene, and the roughing dosage is 0.1-1 kg / t; The frother is one of No. 2 oil and MIBC, and the roughing dosage is 50-200 g / t.

5. The application of the combined inhibitor for copper-molybdenum mixed concentrate flotation separation according to claim 1, characterized in that: During grinding, the thiosemicarbazide is added in the proportion of 150-350 g per ton of copper-molybdenum mixed concentrate, and the thiolactic acid is added in the proportion of 120-240 g per ton of copper-molybdenum mixed concentrate, and the amount of the thiolactic acid is less than that of the thiosemicarbazide.

6. The application of the combined inhibitor for copper-molybdenum mixed concentrate flotation separation according to claim 1, characterized in that: During the first-stage cleaning, the thiosemicarbazide is added in the proportion of 80-170 g per ton of copper-molybdenum mixed concentrate, and the thiolactic acid is added in the proportion of 65-110 g per ton of copper-molybdenum mixed concentrate, and the amount of the thiolactic acid is less than that of the thiosemicarbazide; during the second-stage cleaning, the thiosemicarbazide is added in the proportion of 40-90 g per ton of copper-molybdenum mixed concentrate, and the thiolactic acid is added in the proportion of 25-60 g per ton of copper-molybdenum mixed concentrate, and the amount of the thiolactic acid is less than that of the thiosemicarbazide; during the third-stage cleaning, the thiosemicarbazide is added in the proportion of 20-50 g per ton of copper-molybdenum mixed concentrate, and the thiolactic acid is added in the proportion of 13-22 g per ton of copper-molybdenum mixed concentrate, and the amount of the thiolactic acid is less than that of the thiosemicarbazide.

7. The application of the combined inhibitor for copper-molybdenum mixed concentrate flotation separation according to claim 6, characterized in that: The ratio of the thiosemicarbazide to the thiolactic acid in the second-stage cleaning is greater than that in the first-stage cleaning; the ratio of the thiosemicarbazide to the thiolactic acid in the third-stage cleaning is greater than that in the second-stage cleaning.

8. The application of the combined inhibitor for copper-molybdenum mixed concentrate flotation separation according to claim 6, characterized in that: ​ ​ ​ The action time of the flotation reagent is 2-3 minutes; the flotation scraping bubble time is 3-5 minutes; and the rotation speed of the flotation machine is adjusted to 1800-1900 r / min. The action time of the flotation reagent is 2-3 minutes; the flotation scraping bubble time is 3-5 minutes; and the rotation speed of the flotation machine

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