A method for recovering copper and molybdenum from mud-containing low-grade fine-grained embedded copper-molybdenum ore

Abstract

The present invention discloses a method for recovering copper and molybdenum from muddy, low-grade, fine-grained, embedded copper-molybdenum ore. The muddy, low-grade, fine-grained, embedded copper-molybdenum ore is coarsely ground under low-alkalinity conditions, subjected to a single mixed flotation roughing separation and two mixed flotation scavenging separations, followed by tailings discarding and obtaining a mixed flotation roughing concentrate. The mixed flotation roughing concentrate is finely ground and subjected to three mixed flotation separations, a single molybdenum roughing separation, and a single molybdenum scavenging separation to obtain a copper concentrate and a molybdenum roughing concentrate containing more than 20% copper. The molybdenum roughing concentrate is subjected to magnetic separation to remove some chalcopyrite to improve the molybdenum content of the roughing concentrate, followed by concentration and drug removal. The molybdenum concentrate is then subjected to scrubbing for drug removal and enhanced dispersion suppression, followed by three molybdenum concentrating separations and a single fine scavenging separation. The present invention can effectively recover copper and molybdenum from muddy, low-grade, fine-grained, embedded copper-molybdenum ore, achieving efficient resource recovery.

Description

Technical Field

[0001] The present invention relates to the technical field of polymetallic sulfide ore beneficiation, and in particular to a method for recovering copper and molybdenum from mud-containing low-grade fine-grained embedded copper-molybdenum ore. Background Art

[0002] Sodium sulfide is the most widely used copper mineral inhibitor in the copper-molybdenum separation process. However, sodium sulfide has poor stability and large dosage. A large amount of inhibitor is needed to inhibit copper sulfide ore. -9 m 3 / kg) and chalcopyrite (specific magnetic susceptibility is 0.844×10 -6 m 3 Due to the physical property differences between copper and molybdenum (kg / kg), magnetic separation has become a research hotspot to reduce the amount of sodium sulfide used in copper-molybdenum separation. However, production practice has shown that the molybdenum content of magnetic separation concentrates exceeds 0.12%, far exceeding the production targets of copper-molybdenum flotation separation processes. Furthermore, as the molybdenum grade decreases, the amount of molybdenum metal entrained in the copper concentrate from magnetic separation processes increases, reducing the likelihood of tailings being discarded. Currently available production processes for muddy, low-grade, fine-grained copper-molybdenum ores have certain drawbacks.

[0003] CN107971124A discloses a copper-molybdenum separation method for muddy and sulfur-containing low-grade copper-molybdenum ore, specifically comprising grinding-copper-molybdenum mixed flotation-desilting and desulfurization-copper-molybdenum separation flotation. The desilting and desulfurization steps are intended to further improve the quality of the mixed concentrate. Although they can achieve the purpose of copper-molybdenum separation, the desilting and desulfurization steps are extremely energy-consuming and chemical-consuming. In addition, the desilting and desulfurization steps result in a certain amount of metal loss, which is not conducive to production management. CN106583026A provides a flotation-magnetic combined copper-molybdenum separation method, which uses a copper-molybdenum mixed concentrate as the feed ore and performs copper-suppression flotation and molybdenum flotation. The flotation concentrate is further separated from copper and molybdenum using a superconducting magnetic separator with a background magnetic field strength of 3200 to 4800 kA / m. The resulting non-magnetic portion is the molybdenum concentrate product, and the resulting magnetic concentrate is returned as middlings to the copper-suppression flotation and molybdenum flotation separation roughing operation. This process does not take into account the impact of the quality and mud content of the copper-molybdenum mixed concentrate, resulting in poor quality of the molybdenum concentrate and a high level of copper-molybdenum cross-contamination.

[0004] Therefore, for mud-containing, low-grade, fine-grained copper-molybdenum ores, the generation of secondary mud should be minimized, residual reagents in mixed concentrates should be treated correctly, harmful elements in mixed flotation concentrates should be reduced, the amount of sodium sulfide used should be reduced, a large magnetic levitation cycle should be carried out, the harshness of the production process should be improved, the adaptability of the process flow should be improved, and efficient separation of copper and molybdenum should be achieved. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention aims to provide a method for recovering copper and molybdenum from mud-containing low-grade fine-grained embedded copper-molybdenum ore.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for recovering copper and molybdenum from mud-containing low-grade fine-grained copper-molybdenum ore comprises the following steps:

[0008] S1. Coarsely grinding the mud-containing low-grade fine-grained copper-molybdenum ore under low alkalinity conditions;

[0009] S2. The coarsely ground product undergoes a copper-molybdenum mixed flotation roughing separation to obtain a mixed flotation roughing concentrate and a mixed flotation roughing tailing. The mixed flotation roughing tailing undergoes two copper-molybdenum mixed flotation scavenging separations. The mixed flotation scavenging concentrate obtained from the first copper-molybdenum mixed flotation scavenging separation is returned to the copper-molybdenum mixed flotation roughing separation operation, and the obtained mixed flotation scavenging tailings enter the second copper-molybdenum mixed flotation scavenging separation; the mixed flotation scavenging concentrate obtained from the second copper-molybdenum mixed flotation scavenging separation is returned to the first copper-molybdenum mixed flotation scavenging separation;

[0010] S3, after fine grinding of the mixed flotation rougher concentrate, three copper-molybdenum mixed flotation concentrations are carried out. The mixed flotation concentrates obtained from the first two copper-molybdenum mixed flotation concentrations enter the next copper-molybdenum mixed flotation concentration operation, the mixed flotation tailings obtained from the first copper-molybdenum mixed flotation concentration are returned to the copper-molybdenum mixed flotation rougher operation, and the mixed flotation tailings obtained from the remaining two copper-molybdenum mixed flotation concentrations are returned to the previous copper-molybdenum mixed flotation concentration operation;

[0011] S4. The mixed flotation concentrate obtained from the last copper-molybdenum mixed flotation is subjected to a molybdenum roughing operation, and the resulting molybdenum roughing tailings are subjected to a molybdenum scavenging operation to obtain copper concentrate and molybdenum scavenging concentrate, and the molybdenum scavenging concentrate is returned to the molybdenum roughing operation; the molybdenum roughing concentrate obtained from the molybdenum roughing operation is subjected to magnetic separation to remove part of the chalcopyrite to improve the molybdenum content of the rough concentrate, and then concentrated and de-doped, and then scrubbed to remove the de-doping, and then subjected to three molybdenum concentrations to obtain molybdenum concentrate and molybdenum concentrated tailings. The molybdenum concentrated tailings are subjected to a molybdenum fine scavenging operation, and the obtained fine scavenging concentrate is returned to the first molybdenum concentrating operation, and the obtained fine scavenging tailings are returned to the molybdenum roughing operation.

[0012] Furthermore, in step S1, lime as an adjusting agent is added to the mud-containing low-grade fine-grained copper-molybdenum ore to adjust the pH to 7-8, and water is added at a clean water: ore mass ratio of 2:3 for grinding, and the ore is ground to a grinding fineness of -0.074 mm, accounting for 60-65%.

[0013] Furthermore, in the copper-molybdenum mixed flotation roughing of step S2, 20-40 g / t of sodium hexametaphosphate and 10-20 g / t of sodium sulfide as adjusting agents, 50-60 g / t of butyl xanthate as collecting agent, and 20-30 g / t of No. 2 oil as foaming agent are sequentially added to the coarsely ground product based on the dry weight of each ton of raw ore, and then the copper-molybdenum mixed flotation roughing is carried out to obtain mixed flotation roughing concentrate and mixed flotation roughing tailings.

[0014] Furthermore, in step S3, the mixed flotation rougher concentrate is finely ground to a grinding fineness of -0.038 mm accounting for 85%-90%.

[0015] Furthermore, in the copper-molybdenum mixed flotation concentration of step S3, based on the dry weight of each ton of raw ore, 15-30 g / t of sodium hexametaphosphate as an adjusting agent is added in the first copper-molybdenum mixed flotation concentration, and 10-20 g / t of sodium hexametaphosphate as an adjusting agent is added in the second copper-molybdenum mixed flotation concentration. No reagent is added in the second copper-molybdenum mixed flotation concentration.

[0016] Furthermore, in step S2, based on the dry weight of each ton of ore, 25-30 g / t of butyl xanthate collector and 10-15 g / t of No. 2 oil foaming agent are added in the first copper-molybdenum mixed flotation sweep, and 10-20 g / t of butyl xanthate collector is added in the second copper-molybdenum mixed flotation sweep.

[0017] Furthermore, in step S4, based on the dry weight of each ton of raw ore, 4-5 g / t of sodium hexametaphosphate as an adjusting agent, 200-240 g / t of sodium sulfide and 20-30 g / t of thioglycolic acid as inhibitors, and 20-25 g / t of kerosene as a defoaming agent are added during the rough selection of molybdenum.

[0018] Furthermore, in step S4, 50-60 g / t of sodium sulfide as an inhibitor and 10-15 g / t of kerosene as a defoaming agent are added during molybdenum scavenging, calculated on a dry weight basis per ton of raw ore.

[0019] Furthermore, in the magnetic separation operation of step S4, the molybdenum roughing concentrate enters the high gradient magnetic separator for magnetic separation, the magnetic separation intensity is 1.4-1.5T, the magnetic separation stroke is 200r / min, and the magnetic concentrate and magnetic tailings are obtained. The magnetic concentrate is returned to the molybdenum roughing operation, and the magnetic tailings enter the thickener for dehydration and concentration, and the underflow of the thickener enters the ball mill for scrubbing and drug removal.

[0020] Furthermore, in the three molybdenum concentrations of step S4, based on the dry weight of the raw ore, 2-4 g / t of sodium hexametaphosphate as an adjusting agent, 50-60 g / t of sodium sulfide as an inhibitor and 10-15 g / t of thioglycolic acid, and 10-15 g / t of kerosene as a defoaming agent are added in the first molybdenum concentration; 10-15 g / t of sodium sulfide as an inhibitor and 10-15 g / t of kerosene as a defoaming agent are added in the second molybdenum concentration; and 1-2 g / t of sodium hexametaphosphate as an adjusting agent is added in the third molybdenum concentration.

[0021] During the molybdenum fine sweeping in step S4, 10-15 g / t of sodium sulfide as an inhibitor is added.

[0022] The beneficial effects of the present invention are:

[0023] 1) The present invention adopts the technical concept of "coarse grinding and mixed flotation of raw ore - fine grinding and reselection of mixed flotation coarse concentrate - combined use of magnetic flotation for coarse and fine molybdenum" for tiered grinding and tiered separation. It is suitable for processing high-grade and low-grade fine-grained copper-molybdenum ores containing mud. It has the characteristics of convenient operation and management, low reagent cost, high sorting efficiency, good separation effect, and stable indicators. Coarse grinding and mixed flotation of raw ore can significantly reduce the impact of mud minerals (sericite, chlorite, etc.) on the flotation system, improve the quality of mixed flotation coarse concentrate, and at the same time reduce the grinding load and improve the grinding efficiency; re-grinding of mixed flotation coarse concentrate can effectively improve the quality of mixed flotation concentrate by deeply dissociating intergrowths; the use of magnetic flotation for molybdenum coarse concentrate in a large circulation can reduce the content of chalcopyrite in the molybdenum concentration operation, improve the molybdenum-copper ratio of the selected feed, reduce reagent consumption, and reduce the requirements for molybdenum coarse concentration operation.

[0024] 2) The present invention adopts a process of magnetic separation to improve the quality of molybdenum coarse concentrate and reduce copper content - concentration and drug removal - scrubbing and drug removal - flotation. By strengthening dispersion, scrubbing and drug removal, and concentration and desludging, the influence of mud on flotation is greatly reduced, the quality of molybdenum concentrate feed is improved, reagent consumption is reduced, the mutual inclusion of copper and molybdenum concentrate is reduced, the quality of copper and molybdenum concentrate is improved, and efficient recovery of the target mineral is achieved. The use of magnetic separation to improve the quality of molybdenum coarse concentrate and reduce copper content can significantly reduce the amount of slurry in the magnetic separation operation and the processing capacity of the thickener. On the other hand, it can stabilize the production indicators of the molybdenum coarse scavenging operation, ensure the quality of the copper concentrate, and reduce the molybdenum content in the copper concentrate.

[0025] 3) In the present invention, butyl xanthate is used as a collector, and sodium sulfide and sodium hexametaphosphate are used as adjusting agents in the copper-molybdenum mixed flotation. Firstly, butyl xanthate has a strong collecting ability, and under the cooperation of low alkali and coarse grinding conditions, the recovery rate of the target mineral can be greatly improved; secondly, the concentration-scrubbing combined process can better overcome the unfavorable factors such as the difficulty of removing the drug and the serious entrainment, which is conducive to reducing the mutual inclusion of copper and molybdenum, thereby improving the grade of copper concentrate and molybdenum concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the method flow of each embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0028] The low-grade, fine-grained, disseminated copper-molybdenum ore used in Examples 1 and 2 was Duobaoshan Copper Mine, with the following chemical composition (wt%): 0.36% copper and 0.012% molybdenum. The copper minerals were primarily chalcopyrite and bornite; the molybdenum minerals were primarily molybdenite, with a medium-to-fine particle size, primarily ranging from 10 to 74 μm. Quartz and silicate minerals accounted for approximately 92%, with argillizing minerals such as chlorite, micas, and dickite accounting for approximately 40%.

[0029] Example 1

[0030] like Figure 1 As shown, based on the dry weight of each ton of ore, 500g / t of lime is added to the ore to adjust the pH to 7, and water is added at a clean water: ore mass ratio of 2:3 for grinding. The ore is ground to a grinding fineness of -0.074mm accounting for 60%, and then copper-molybdenum mixed flotation roughing, copper-molybdenum mixed flotation scavenging I and copper-molybdenum mixed flotation scavenging II are used to obtain copper-molybdenum mixed flotation roughing concentrate and final tailings. After the copper-molybdenum mixed flotation rougher concentrate is finely ground to a grinding fineness of -0.038mm accounting for 85%, molybdenum rougher concentrate and molybdenum scavenging tailings (copper concentrate) are obtained through copper-molybdenum mixed flotation selection I, copper-molybdenum mixed flotation selection II, copper-molybdenum mixed flotation selection III, molybdenum rougher selection and molybdenum scavenging tailings; the molybdenum rougher concentrate enters a high-gradient magnetic separator for magnetic separation with a magnetic separation intensity of 1.4T and a pulse rate of 200r / min to obtain magnetic concentrate and magnetic tailings, and the magnetic concentrate is returned to the molybdenum rougher operation; the magnetic tailings enter a thickener for dehydration and concentration, and then enter a ball mill for scrubbing and drug removal, and then go through molybdenum selection I, molybdenum selection II, molybdenum selection III and molybdenum concentrate scavenging to obtain molybdenum concentrate.

[0031] The copper-molybdenum mixed flotation and selection I tailings and the copper-molybdenum mixed flotation and selection I concentrate are combined and returned to the copper-molybdenum mixed flotation and selection roughing operation; the molybdenum scavenging concentrate, the molybdenum concentrate scavenging tailings and the magnetic separation concentrate are combined and returned to the molybdenum roughing operation; the molybdenum selection II tailings and the molybdenum concentrate scavenging concentrate are combined and returned to the molybdenum selection I operation; the copper-molybdenum mixed flotation and selection II concentrate, the copper-molybdenum mixed flotation and selection II tailings, the copper-molybdenum mixed flotation and selection III tailings and the molybdenum concentration III tailings are respectively returned to the previous level operation.

[0032] Among them, 20g / t of sodium hexametaphosphate, 10g / t of sodium sulfide, 50g / t of butyl xanthate and 20g / t of No. 2 oil were added in the copper-molybdenum mixed flotation roughing operation; 15g / t of sodium hexametaphosphate was added in the copper-molybdenum mixed flotation concentration I operation; 10g / t of sodium hexametaphosphate was added in the copper-molybdenum mixed flotation concentration II operation; 25g / t of butyl xanthate and 10g / t of No. 2 oil were added in the copper-molybdenum mixed flotation sweeping operation I; 10g / t of butyl xanthate was added in the copper-molybdenum mixed flotation sweeping operation II; 4g / t of sodium hexametaphosphate was added in the molybdenum roughing operation g / t, sodium sulfide 200g / t, thioglycolic acid 20g / t and kerosene 20g / t, sodium sulfide 50g / t and kerosene 10g / t are added in the molybdenum scavenging process, sodium hexametaphosphate 2g / t, sodium sulfide 50g / t, thioglycolic acid 10g / t and kerosene 10g / t are added in the molybdenum concentration I process, sodium sulfide 10g / t and kerosene 10g / t are added in the molybdenum concentration II process, sodium hexametaphosphate 1g / t is added in the molybdenum concentration III process, and sodium sulfide 10g / t is added in the molybdenum fine scavenging process.

[0033] Example 2

[0034] like Figure 1 As shown, based on the dry weight of each ton of ore, 800g / t of lime is added to the ore to adjust the pH to 8, and water is added at a clean water: ore mass ratio of 2:3 for grinding. The ore is ground to a grinding fineness of -0.074mm, accounting for 65%, and then copper-molybdenum mixed flotation roughing, copper-molybdenum mixed flotation scavenging I and copper-molybdenum mixed flotation scavenging II are used to obtain copper-molybdenum mixed flotation roughing concentrate and final tailings; the copper-molybdenum mixed flotation roughing concentrate is finely ground to a grinding fineness of -0.038mm, accounting for 90%, and then copper-molybdenum mixed flotation scavenging I, copper-molybdenum mixed flotation scavenging II are used to obtain copper-molybdenum mixed flotation roughing concentrate and final tailings. Molybdenum rougher concentrate and molybdenum scavenging tailings (copper concentrate) are obtained through selection II, copper-molybdenum mixed flotation selection III, molybdenum roughing and molybdenum scavenging; the molybdenum rougher concentrate enters the high gradient magnetic separator for magnetic separation, with a magnetic separation intensity of 1.5T and a pulse rate of 200r / min to obtain magnetic concentrate and magnetic tailings, and the magnetic concentrate is returned to the molybdenum roughing operation; the magnetic tailings enter the thickener for dehydration and concentration, and then enter the ball mill for scrubbing and drug removal, and then go through molybdenum selection I, molybdenum selection II, molybdenum selection III and molybdenum concentrate scavenging to obtain molybdenum concentrate.

[0035] The copper-molybdenum mixed flotation and selection I tailings and the copper-molybdenum mixed flotation and selection I concentrate are combined and returned to the copper-molybdenum mixed flotation and selection roughing operation; the molybdenum scavenging concentrate, the molybdenum concentrate scavenging tailings and the magnetic separation concentrate are combined and returned to the molybdenum roughing operation; the molybdenum selection II tailings and the molybdenum concentrate scavenging concentrate are combined and returned to the molybdenum selection I operation; the copper-molybdenum mixed flotation and selection II concentrate, the copper-molybdenum mixed flotation and selection II tailings, the copper-molybdenum mixed flotation and selection III tailings and the molybdenum concentration III tailings are respectively returned to the previous level operation.

[0036] Among them, 40g / t of sodium hexametaphosphate, 20g / t of sodium sulfide, 60g / t of butyl xanthate and 30g / t of No. 2 oil were added in the copper-molybdenum mixed flotation roughing operation; 30g / t of sodium hexametaphosphate was added in the copper-molybdenum mixed flotation and concentration I operation; 20g / t of sodium hexametaphosphate was added in the copper-molybdenum mixed flotation and concentration II operation; 30g / t of butyl xanthate and 15g / t of No. 2 oil were added in the copper-molybdenum mixed flotation and sweeping operation I; 20g / t of butyl xanthate was added in the copper-molybdenum mixed flotation and sweeping operation II; 5g / t of sodium hexametaphosphate was added in the molybdenum roughing operation g / t, sodium sulfide 240g / t, thioglycolic acid 30g / t and kerosene 25g / t, sodium sulfide 60g / t and kerosene 15g / t are added in the molybdenum scavenging process, sodium hexametaphosphate 4g / t, sodium sulfide 60g / t, thioglycolic acid 15g / t and kerosene 15g / t are added in the molybdenum concentration I process, sodium sulfide 15g / t and kerosene 15g / t are added in the molybdenum concentration II process, sodium hexametaphosphate 2g / t is added in the molybdenum concentration III process, and sodium sulfide 15g / t is added in the molybdenum fine scavenging process.

[0037] The only difference between Example 2 and Example 1 is the amount of reagent used and the grinding fineness. Other conditions and implementation processes are exactly the same. The implementation of the above two examples is shown in Table 1.

[0038] Table 1

[0039]

[0040] The implementation of Example 1 and Example 2 shows that the process of Example 1-2 is advanced and can recover copper and molybdenum from mud-containing low-grade fine-grained embedded copper-molybdenum ore, thereby achieving effective recovery of resources.

[0041] Those skilled in the art can make various corresponding changes and modifications based on the above technical solutions and concepts, and all of these changes and modifications should be included in the scope of protection of the claims of the present invention.

Claims

1. A method for recovering copper and molybdenum from mud-containing low-grade fine-grained copper-molybdenum ore, characterized in that: The steps include: S1. Coarsely grinding the mud-containing low-grade fine-grained copper-molybdenum ore under low alkalinity conditions; S2. The coarsely ground product undergoes a copper-molybdenum mixed flotation roughing separation to obtain a mixed flotation roughing concentrate and a mixed flotation roughing tailing. The mixed flotation roughing tailing undergoes two copper-molybdenum mixed flotation scavenging separations. The mixed flotation scavenging concentrate obtained from the first copper-molybdenum mixed flotation scavenging separation is returned to the copper-molybdenum mixed flotation roughing separation operation, and the obtained mixed flotation scavenging tailings enter the second copper-molybdenum mixed flotation scavenging separation; the mixed flotation scavenging concentrate obtained from the second copper-molybdenum mixed flotation scavenging separation is returned to the first copper-molybdenum mixed flotation scavenging separation; S3, after fine grinding of the mixed flotation rougher concentrate, three copper-molybdenum mixed flotation concentrations are carried out. The mixed flotation concentrates obtained from the first two copper-molybdenum mixed flotation concentrations enter the next copper-molybdenum mixed flotation concentration operation, the mixed flotation tailings obtained from the first copper-molybdenum mixed flotation concentration are returned to the copper-molybdenum mixed flotation rougher operation, and the mixed flotation tailings obtained from the remaining two copper-molybdenum mixed flotation concentrations are all returned to the previous copper-molybdenum mixed flotation concentration operation; S4. The mixed flotation concentrate obtained from the last copper-molybdenum mixed flotation is subjected to a molybdenum roughing operation, and the resulting molybdenum roughing tailings are subjected to a molybdenum scavenging operation to obtain copper concentrate and molybdenum scavenging concentrate, and the molybdenum scavenging concentrate is returned to the molybdenum roughing operation; the molybdenum roughing concentrate obtained from the molybdenum roughing operation is subjected to magnetic separation to remove part of the chalcopyrite to improve the molybdenum content of the rough concentrate, and then concentrated and de-doped, and then scrubbed to remove the de-doping, and then subjected to three molybdenum concentrations to obtain molybdenum concentrate and molybdenum concentrated tailings. The molybdenum concentrated tailings are subjected to a molybdenum fine scavenging operation, and the obtained fine scavenging concentrate is returned to the first molybdenum concentrating operation, and the obtained fine scavenging tailings are returned to the molybdenum roughing operation.

2. The method according to claim 1, characterized in that In step S1, lime as an adjusting agent is added to the mud-containing low-grade fine-grained copper-molybdenum ore to adjust the pH to 7-8, and water is added at a mass ratio of clean water to ore of 2:3 for grinding. The ore is ground to a grinding fineness of -0.074 mm, accounting for 60-65%.

3. The method according to claim 1, characterized in that In the copper-molybdenum mixed flotation roughing of step S2, based on the dry weight of each ton of raw ore, 20-40 g / t of sodium hexametaphosphate and 10-20 g / t of sodium sulfide as adjusting agents, 50-60 g / t of butyl xanthate as collecting agent, and 20-30 g / t of No. 2 oil as foaming agent are sequentially added to the coarsely ground product, and then the copper-molybdenum mixed flotation roughing is carried out to obtain mixed flotation roughing concentrate and mixed flotation roughing tailings.

4. The method according to claim 1, wherein In step S3, the mixed flotation rougher concentrate is finely ground to a grinding fineness of -0.038 mm, accounting for 85%-90%.

5. The method according to claim 1, characterized in that In the copper-molybdenum mixed flotation concentration of step S3, based on the dry weight of each ton of raw ore, 15-30 g / t of sodium hexametaphosphate as a regulating agent is added in the first copper-molybdenum mixed flotation concentration, and 10-20 g / t of sodium hexametaphosphate as a regulating agent is added in the second copper-molybdenum mixed flotation concentration. No reagent is added in the second copper-molybdenum mixed flotation concentration.

6. The method according to claim 1, characterized in that In step S2, based on the dry weight of each ton of ore, 25-30 g / t of butyl xanthate as a collector and 10-15 g / t of No. 2 oil as a foaming agent are added in the first copper-molybdenum mixed flotation sweep, and 10-20 g / t of butyl xanthate as a collector is added in the second copper-molybdenum mixed flotation sweep.

7. The method according to claim 1, characterized in that In step S4, based on the dry weight of each ton of raw ore, 4-5 g / t of sodium hexametaphosphate as an adjusting agent, 200-240 g / t of sodium sulfide and 20-30 g / t of thioglycolic acid as an inhibitor, and 20-25 g / t of kerosene as a defoaming agent are added during the rough selection of molybdenum.

8. The method according to claim 1, characterized in that In step S4, based on the dry weight of the raw ore, 50-60 g / t of sodium sulfide as an inhibitor and 10-15 g / t of kerosene as a defoaming agent are added during molybdenum scavenging.

9. The method according to claim 1, characterized in that In the magnetic separation operation of step S4, the molybdenum roughing concentrate enters the high gradient magnetic separator for magnetic separation. The magnetic separation intensity is 1.4-1.5T and the magnetic separation stroke is 200r / min to obtain magnetic concentrate and magnetic tailings. The magnetic concentrate is returned to the molybdenum roughing operation. The magnetic tailings enter the thickener for dehydration and concentration, and the underflow of the thickener enters the ball mill for scrubbing and drug removal.

10. The method according to claim 1, characterized in that In the three molybdenum concentrations of step S4, based on the dry weight of the raw ore, 2-4 g / t of sodium hexametaphosphate as an adjusting agent, 50-60 g / t of sodium sulfide as an inhibitor and 10-15 g / t of thioglycolic acid as an inhibitor, and 10-15 g / t of kerosene as a defoaming agent are added in the first molybdenum concentration; 10-15 g / t of sodium sulfide as an inhibitor and 10-15 g / t of kerosene as a defoaming agent are added in the second molybdenum concentration; and 1-2 g / t of sodium hexametaphosphate as an adjusting agent is added in the third molybdenum concentration; During the molybdenum fine sweeping in step S4, 10-15 g / t of sodium sulfide as an inhibitor is added.

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