Beneficiation method for improving copper-molybdenum recovery rate of copper-molybdenum ore

Abstract

The invention discloses a beneficiation method for improving copper-molybdenum recovery rate of copper-molybdenum ore, which comprises the following steps: grinding copper-molybdenum raw ore to a reasonable flotation particle size, and sequentially adding lime, a collecting agent and a foaming agent into ore pulp in a flotation roughing process of copper, molybdenum and the like to obtain copper-molybdenum mixed rough concentrate I and flotation roughing tailings of copper, molybdenum and the like; a copper mineral collecting agent is added into the copper-molybdenum and other floatable roughing tailing slurry for copper-molybdenum and other floatable scavenging, and copper-molybdenum and other floatable scavenging concentrates and tailings are obtained; lime, a collecting agent and a foaming agent are sequentially added into flotation scavenging tailing slurry such as copper and molybdenum, and copper and molybdenum mixed rough concentrate II and copper reinforced roughing tailings are obtained; a collecting agent is added into the copper-reinforced roughing tailing slurry for two times of scavenging, and final tailings are obtained; and the copper-molybdenum mixed rough concentrate I and the copper-molybdenum mixed rough concentrate II are subjected to two-time concentration and three-time concentration correspondingly, and finally copper-molybdenum bulk concentrate I and copper-molybdenum bulk concentrate II are obtained. The method can effectively improve the quality of the copper-molybdenum bulk concentrate, is high in adaptability to complex ores, and remarkably improves the copper-molybdenum recovery rate.

Description

Technical Field

[0001] The invention relates to the technical field of chemical metallurgical processing, and in particular to a mineral processing method capable of improving the recovery rate of copper and molybdenum in copper-molybdenum ore. Background Art

[0002] There are a series of problems in my country's copper-molybdenum mines, such as low ore grade, fine embedded particle size, and complex ore types, which to a certain extent limit the efficient utilization of my country's copper-molybdenum resources. As an extra-large porphyry copper mine, the Julong Copper Mine in Tibet has a single ore type and relatively stable ore properties. The copper-molybdenum isofloatable-copper-molybdenum separation-copper enhanced flotation process is adopted on site. In the isofloatable operation, the pH value of the slurry is adjusted to a low-alkali environment (pH value of 7.5-9.5). The copper mine has achieved good process indicators under this process, and the copper-molybdenum recovery rate has reached the ideal effect. However, when the pH value of the slurry is 7.5-9.5, bubbling is prone to occur on site, resulting in poor concentrate grade and affecting the recovery rate.

[0003] Tibet Yulong Copper Mine is also a super-large porphyry copper mine. With the continuous exploitation of mineral resources and the change of rock strata distribution, there are many types of minerals and complex inter-mineral replacement and inter-embedded relationships. The types of ores include porphyry, hornfels, skarn, copper-sulfur and low-grade stockpile mines. Most of the copper minerals are chalcopyrite, chalcocite and other minerals. The molybdenum mineral is molybdenite, and they are all accompanied by certain pyrite and pyrrhotite. The original process uses a mixed flotation process of one roughing, two sweeping and three fines under high alkaline conditions. In the high alkaline slurry environment, free calcium oxide is easily adsorbed on the surface of molybdenite, making the surface of molybdenite hydrophilic. The floatability of molybdenum minerals is poor after being suppressed, and the associated precious metal minerals are also suppressed to a certain extent. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a mineral processing method which utilizes a low-alkali environment to first select easily selected copper-molybdenum minerals, and then performs copper strengthening operations to carry out enhanced recovery of copper minerals, thereby effectively improving the quality of copper-molybdenum mixed concentrate, ensuring the stability of product quality, and greatly improving the recovery rate of copper and molybdenum.

[0005] In order to solve the above technical problems, the present invention adopts the following technical scheme: a beneficiation method for improving the copper and molybdenum recovery rate of copper-molybdenum ore is carried out according to the following steps:

[0006] (1) Grinding the copper-molybdenum ore to make the ore flotation particle size -0.074 mm account for 65±3% and the slurry concentration is 27%±3%;

[0007] (2) The ore pulp after the grinding treatment in step (1) is subjected to a floatable roughing of copper, molybdenum, etc., and the following are added in sequence: lime to keep the pH value of the ore pulp at 10.0-10.5; a collector BK404C for copper minerals, the addition amount of which is 14-28 g / t; kerosene and BK345A for molybdenum minerals, the addition amounts of which are 30-40 g / t and 10-20 g / t, respectively; and a frother BK201, the addition amount of which is 7-14 g / t, to obtain a copper-molybdenum mixed rough concentrate I and a floatable roughing tailing of copper, molybdenum, etc.;

[0008] (3) adding a copper mineral collector BK404C in an amount of 7-14 g / t to the copper, molybdenum and other floatable roughing tailings obtained in step (2); adding a molybdenum mineral collector BK345A in an amount of 4-8 g / t to carry out a copper, molybdenum and other floatable scavenging to obtain a copper, molybdenum and other floatable scavenging concentrate and tailings, and returning the scavenging concentrate to the copper, molybdenum and other floatable roughing operation;

[0009] (4) When the copper, molybdenum and other floatable tailings slurry obtained in step (3) is subjected to copper enhanced roughing, the following are added in sequence: lime to keep the pH value of the tailings slurry at 11.0-11.5; BK404C, a collector for copper minerals, in an amount of 8-16 g / t; kerosene, a collector for molybdenum minerals, in an amount of 2-10 g / t; and BK201, a foaming agent, in an amount of 7-14 g / t, to obtain a copper-molybdenum mixed rough concentrate II and copper enhanced roughing tailings;

[0010] (5) adding 4-8 g / t of copper mineral collector BK404C to the copper enhanced roughing tailings slurry obtained in step (4), performing copper enhanced primary scavenging, obtaining primary scavenging concentrate and primary scavenging tailings, and returning the primary scavenging concentrate to the copper enhanced roughing operation;

[0011] (6) adding 2-4 g / t copper collector BK404C to the copper enhanced primary scavenging tailings slurry obtained in step (5), and performing copper enhanced secondary scavenging to obtain secondary scavenging concentrate and secondary scavenging tailings; the secondary scavenging concentrate is returned to the primary scavenging operation, and the secondary scavenging tailings are the final tailings, which are discharged into the tailings pond;

[0012] (7) performing a primary concentration on the copper-molybdenum mixed roughing concentrate I obtained in step (2) to obtain a primary concentrated concentrate and a primary concentrated tailings, and returning the primary concentrated tailings to the copper-molybdenum and other floatable roughing operations;

[0013] (8) subjecting the primary concentrated concentrate obtained in step (7) to secondary concentration to obtain secondary concentrated concentrate and secondary concentrated tailings, wherein the secondary concentrated tailings are returned to the primary concentration operation, and the secondary concentrated concentrate is the copper-molybdenum mixed concentrate I;

[0014] (9) performing a primary beneficiation on the copper-molybdenum mixed rough concentrate II obtained in step (4) to obtain a primary beneficiated concentrate and a primary beneficiated tailings, and returning the primary beneficiated tailings to the copper enhanced roughing operation;

[0015] (10) subjecting the primary concentrated concentrate obtained in step (9) to secondary concentration to obtain secondary concentrated concentrate and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation;

[0016] (11) The secondary concentrated concentrate obtained in step (10) is subjected to tertiary concentration to obtain tertiary concentrated concentrate and tertiary concentrated tailings. The tertiary concentrated tailings are returned to the secondary concentration operation. The tertiary concentrated concentrate is the copper-molybdenum mixed concentrate II.

[0017] The present invention adopts the "copper, molybdenum and other flotation-copper enhanced flotation" process and a more reasonable reagent formula ratio. In the copper, molybdenum and other flotation operation section, the easy-to-select copper, molybdenum minerals are first selected in a low-alkali environment, and the copper enhanced operation section performs enhanced recovery of copper minerals, so that the easy-to-float copper, molybdenum and precious metal minerals are quickly floated under low-alkali conditions, and then the remaining copper minerals are enhanced and recovered under suitable pH conditions, thereby effectively improving the quality of copper-molybdenum mixed concentrates, having strong adaptability to complex ores, and significantly improving the copper-molybdenum recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a process flow chart of the prior art;

[0019] Figure 2 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1 and attached Figure 2 The present invention is further described by specific embodiments:

[0021] Comparative Example 1: In this comparative example, the copper-molybdenum ore is ground to make the ore flotation particle size -0.074mm account for 65%, the slurry concentration is 28%, the copper collector is butyl xanthate, the molybdenum collector is kerosene, and the foaming agent is pine oil. The process is as follows: Figure 1 The test results under different flotation pH conditions are shown in Table 1:

[0022] Table 1 Test results of different flotation pH conditions under original process conditions / %

[0023]

[0024]

[0025] As shown in Table 1, with the existing process, within the range of small fluctuation of the original ore grade, the copper recovery rate increases with the increase of the slurry pH value, and the molybdenum recovery rate shows a trend of first increasing and then decreasing with the increase of the slurry pH value. When the slurry pH value is about 12.5, the copper and molybdenum recovery rates are better. When the original ore copper grade is 0.8594% and the molybdenum grade is 0.0218%, the copper-molybdenum mixed concentrate contains 19.6300% copper and 0.3798 molybdenum, with a copper recovery rate of 78.57% and a molybdenum recovery rate of 60.05%.

[0026] Example 1: In this example, copper and molybdenum raw ore is ground to make the ore flotation particle size -0.074mm account for 65%, the slurry concentration is 28%, the copper collector is BK404C, the molybdenum collector is kerosene + BK345A, and the frother is BK201. The process is as follows: Figure 2 The test results under different flotation pH conditions are shown in Table 2:

[0027] Table 2 Test results of different flotation pH conditions / %

[0028]

[0029] As shown in Table 2, after adopting the process of the present invention, within the range of small fluctuation of the raw ore grade, the copper and molybdenum recovery rates show a decreasing trend as the pH value of the slurry increases. When the pH value of the slurry is about 10.5, the copper and molybdenum recovery rates are better. When the raw ore copper grade is 0.8150% and the molybdenum grade is 0.0272%, the copper-molybdenum mixed comprehensive concentrate contains 27.05% copper and 0.7593% molybdenum, and the copper recovery rate is 85.63% and the molybdenum recovery rate is 72.05%.

[0030] It can be seen from the above laboratory examples that after technical transformation, the process and reagent ratio formula system of the present invention, in a low-alkali (pH value of about 10.5) slurry environment, utilizes copper-molybdenum and other flotation operations to first select easily selected copper-molybdenum minerals, and then uses copper-enhanced operations to enhance the recovery of copper minerals, which can effectively improve the quality of copper-molybdenum mixed concentrates, has strong adaptability to complex ores, and significantly improves the recovery rate of copper and molybdenum.

[0031] Example 2: The raw ore of this example contains 0.669% Cu and 0.043% Mo, and the following steps are followed:

[0032] (1) Grinding the copper-molybdenum ore to make the ore flotation particle size -0.074 mm account for 65% and the slurry concentration is 28%;

[0033] (2) The ore pulp after the grinding treatment in step (1) is subjected to a floatable roughing of copper, molybdenum, etc., and the following are added in sequence: lime to keep the pH value of the ore pulp at 10.0-10.5; a collector BK404C for copper minerals, the addition amount of which is 20 g / t; kerosene and BK345A for molybdenum minerals, the addition amounts of which are 40 g / t and 20 g / t respectively; a frother BK201, the addition amount of which is 14 g / t, to obtain a copper-molybdenum mixed rough concentrate I and a floatable roughing tailing of copper, molybdenum, etc.;

[0034] (3) adding a copper mineral collector BK404C in an amount of 10 g / t to the copper, molybdenum and other floatable roughing tailings obtained in step (2); adding a molybdenum mineral collector BK345A in an amount of 8 g / t, and performing a copper, molybdenum and other floatable scavenging to obtain a copper, molybdenum and other floatable scavenging concentrate and tailings, and returning the scavenging concentrate to the copper, molybdenum and other floatable roughing operation;

[0035] (4) The copper, molybdenum and other floatable tailings slurry obtained in step (3) is subjected to copper enhanced roughing, and the following are added in sequence: lime to keep the pH value of the slurry at 11.0-11.5; BK404C, a collector for copper minerals, is added in an amount of 10 g / t; kerosene, a collector for molybdenum minerals, is added in an amount of 10 g / t; and BK201, a foaming agent, is added in an amount of 14 g / t to obtain a copper-molybdenum mixed rough concentrate II and copper enhanced roughing tailings;

[0036] (5) adding 8 g / t of copper mineral collector BK404C to the copper enhanced roughing tailings slurry obtained in step (4), performing copper enhanced primary scavenging, obtaining primary scavenging concentrate and primary scavenging tailings, and returning the primary scavenging concentrate to the copper enhanced roughing operation;

[0037] (6) adding 4 g / t copper collector BK404C to the copper enhanced primary scavenging tailings slurry obtained in step (5), and performing copper enhanced secondary scavenging to obtain secondary scavenging concentrate and secondary scavenging tailings; the secondary scavenging concentrate is returned to the primary scavenging operation, and the secondary scavenging tailings are the final tailings, which are discharged into the tailings pond;

[0038] (7) performing a primary concentration on the copper-molybdenum mixed rougher concentrate II obtained in step (2) to obtain a primary concentrated concentrate and a primary concentrated tailings, and returning the primary concentrated tailings to the copper-molybdenum and other floatable rougher operations;

[0039] (8) The primary concentrated concentrate obtained in step (7) is subjected to secondary concentration to obtain secondary concentrated concentrate and secondary concentrated tailings, and the secondary concentrated tailings are returned to the primary concentration operation. The secondary concentrated concentrate is the copper-molybdenum mixed concentrate II.

[0040] (9) performing a primary beneficiation on the copper-molybdenum mixed rough concentrate II obtained in step (4) to obtain a primary beneficiated concentrate and a primary beneficiated tailings, and returning the primary beneficiated tailings to the copper enhanced roughing operation;

[0041] (10) subjecting the primary concentrated concentrate obtained in step (9) to secondary concentration to obtain secondary concentrated concentrate and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation;

[0042] (11) The secondary concentrated concentrate obtained in step (10) is subjected to tertiary concentration to obtain tertiary concentrated concentrate and tertiary concentrated tailings. The tertiary concentrated tailings are returned to the secondary concentration operation. The tertiary concentrated concentrate is the copper-molybdenum mixed concentrate II. The results of the ore dressing test are shown in Table 3:

[0043] Table 3 Flotation test results / %

[0044]

[0045] As shown in Table 3, under the condition of the same ore grade, the copper recovery rate is increased by 4.84 percentage points and the molybdenum recovery rate is increased by 1.98 percentage points compared with the original high alkali mixed flotation process by adopting the "copper, molybdenum and other flotation-copper enhanced flotation" process and the new reagent system of the present invention.

[0046] Example 3: The raw ore of this example contains 0.725% Cu and 0.0237% Mo, and the following steps are followed:

[0047] (1) Grinding the copper-molybdenum ore to make the ore flotation particle size -0.074 mm account for 62% and the slurry concentration is 24%;

[0048] (2) The ore pulp after the grinding treatment in step (1) is subjected to a floatable roughing of copper, molybdenum, etc., and the following are added in sequence: lime to keep the pH value of the ore pulp at 10.0-10.5; a collector BK404C for copper minerals, the addition amount of which is 24 g / t; kerosene and BK345A for molybdenum minerals, the addition amounts of which are 30 g / t and 10 g / t, respectively; and a frother BK201, the addition amount of which is 14 g / t, to obtain a copper-molybdenum mixed rough concentrate I and a floatable roughing tailing of copper, molybdenum, etc.;

[0049] (3) adding a copper mineral collector BK404C in an amount of 12 g / t to the copper, molybdenum and other floatable roughing tailings obtained in step (2); adding a molybdenum mineral collector BK345A in an amount of 5 g / t, and performing a copper, molybdenum and other floatable scavenging to obtain a copper, molybdenum and other floatable scavenging concentrate and tailings, and returning the scavenging concentrate to the copper, molybdenum and other floatable roughing operation;

[0050] (4) When the copper, molybdenum and other floatable tailings slurry obtained in step (3) is subjected to copper enhanced roughing, the following are added in sequence: lime to keep the pH value of the slurry at 11.0-11.5; BK404C, a collector for copper minerals, added in an amount of 14 g / t; kerosene, a collector for molybdenum minerals, added in an amount of 8 g / t; and BK201, a foaming agent, added in an amount of 14 g / t, to obtain a copper-molybdenum mixed rough concentrate II and copper enhanced roughing tailings;

[0051] (5) adding 8 g / t copper mineral collector BK404C to the copper enhanced roughing tailings slurry obtained in step (4), performing copper enhanced primary scavenging, obtaining primary scavenging concentrate and primary scavenging tailings, and returning the primary scavenging concentrate to the copper enhanced roughing operation;

[0052] (6) adding 4 g / t copper collector BK404C to the copper enhanced primary scavenging tailings slurry obtained in step (5), and performing copper enhanced secondary scavenging to obtain secondary scavenging concentrate and secondary scavenging tailings; the secondary scavenging concentrate is returned to the primary scavenging operation, and the secondary scavenging tailings are the final tailings, which are discharged into the tailings pond;

[0053] (7) performing a primary concentration on the copper-molybdenum mixed roughing concentrate I obtained in step (2) to obtain a primary concentrated concentrate and a primary concentrated tailings, and returning the primary concentrated tailings to the copper-molybdenum and other floatable roughing operations;

[0054] (8) The primary concentrated concentrate obtained in step (7) is subjected to secondary concentration to obtain a secondary concentrated concentrate and a secondary concentrated tailings, and the secondary concentrated tailings are returned to the primary concentration operation. The secondary concentrated concentrate is the copper-molybdenum mixed concentrate I.

[0055] (9) performing a primary beneficiation on the copper-molybdenum mixed rough concentrate II obtained in step (4) to obtain a primary beneficiated concentrate and a primary beneficiated tailings, and returning the primary beneficiated tailings to the copper enhanced roughing operation;

[0056] (10) subjecting the primary concentrated concentrate obtained in step (9) to secondary concentration to obtain secondary concentrated concentrate and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation;

[0057] (11) The secondary concentrated concentrate obtained in step (10) is subjected to tertiary concentration to obtain tertiary concentrated concentrate and tertiary concentrated tailings. The tertiary concentrated tailings are returned to the secondary concentration operation. The tertiary concentrated concentrate is the copper-molybdenum mixed concentrate II. The results of the ore dressing test are shown in Table 4:

[0058] Table 4 Flotation test results / %

[0059]

[0060] As shown in Table 4, under the condition of consistent ore grade, the copper recovery rate is increased by 3.88 percentage points and the molybdenum recovery rate is increased by 4.10 percentage points compared with the original high alkali mixed flotation process by adopting the "copper, molybdenum and other flotation-copper enhanced flotation" process and the new reagent system of the present invention.

[0061] Example 4: The raw ore of this example contains Cu 0.8448% and Mo 0.0333%, and the following steps are performed:

[0062] (1) Grinding the copper-molybdenum ore to make the ore flotation particle size -0.074 mm account for 68% and the slurry concentration is 30%;

[0063] (2) The ore pulp after the grinding treatment in step (1) is subjected to floatable roughing of copper, molybdenum, etc., and the following are added in sequence: lime to keep the pH value of the ore pulp at 10.0-10.5; BK404C, a collector for copper minerals, is added in an amount of 28 g / t; kerosene and BK345A, collectors for molybdenum minerals, are added in amounts of 40 g / t and 20 g / t, respectively; and BK201, a frother, is added in an amount of 14 g / t to obtain a copper-molybdenum mixed rough concentrate I and a floatable roughing tailing of copper, molybdenum, etc.;

[0064] (3) adding a copper mineral collector BK404C in an amount of 14 g / t to the copper, molybdenum and other floatable roughing tailings obtained in step (2); adding a molybdenum mineral collector BK345A in an amount of 8 g / t, and performing a copper, molybdenum and other floatable scavenging to obtain a copper, molybdenum and other floatable scavenging concentrate and tailings, and returning the scavenging concentrate to the copper, molybdenum and other floatable roughing operation;

[0065] (4) The copper, molybdenum and other floatable tailings slurry obtained in step (3) is subjected to copper enhanced roughing, and the following are added in sequence: lime to keep the pH value of the slurry at 11.0-11.5; BK404C, a collector for copper minerals, added in an amount of 16 g / t; kerosene, a collector for molybdenum minerals, added in an amount of 10 g / t; and BK201, a foaming agent, added in an amount of 14 g / t, to obtain a copper-molybdenum mixed rough concentrate II and copper enhanced roughing tailings;

[0066] (5) adding 8 g / t copper mineral collector BK404C to the copper enhanced roughing tailings slurry obtained in step (4), performing copper enhanced primary scavenging, obtaining primary scavenging concentrate and primary scavenging tailings, and returning the primary scavenging concentrate to the copper enhanced roughing operation;

[0067] (6) adding 4 g / t copper collector BK404C to the copper enhanced primary scavenging tailings slurry obtained in step (5), and performing copper enhanced secondary scavenging to obtain secondary scavenging concentrate and secondary scavenging tailings; the secondary scavenging concentrate is returned to the primary scavenging operation, and the secondary scavenging tailings are the final tailings, which are discharged into the tailings pond;

[0068] (7) performing a primary concentration on the copper-molybdenum mixed roughing concentrate I obtained in step (2) to obtain a primary concentrated concentrate and a primary concentrated tailings, and returning the primary concentrated tailings to the copper-molybdenum and other floatable roughing operations;

[0069] (8) subjecting the primary concentrated concentrate obtained in step (7) to secondary concentration to obtain secondary concentrated concentrate and secondary concentrated tailings, wherein the secondary concentrated tailings are returned to the primary concentration operation, and the secondary concentrated concentrate is the copper-molybdenum mixed concentrate I;

[0070] (9) performing a primary beneficiation on the copper-molybdenum mixed rough concentrate II obtained in step (4) to obtain a primary beneficiated concentrate and a primary beneficiated tailings, and returning the primary beneficiated tailings to the copper enhanced roughing operation;

[0071] (10) subjecting the primary concentrated concentrate obtained in step (9) to secondary concentration to obtain secondary concentrated concentrate and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation;

[0072] (11) The secondary concentrated concentrate obtained in step (10) is subjected to tertiary concentration to obtain tertiary concentrated concentrate and tertiary concentrated tailings. The tertiary concentrated tailings are returned to the secondary concentration operation. The tertiary concentrated concentrate is the copper-molybdenum mixed concentrate II.

[0073] The results of the ore dressing test are shown in Table 5:

[0074] Table 5 Flotation test results / %

[0075]

[0076] As shown in Table 5, under the condition of consistent ore grade, the present invention adopts the "copper, molybdenum and other flotation-copper enhanced flotation" process and the new reagent system, which increases the copper recovery rate by 7.44 percentage points and the molybdenum recovery rate by 9.42 percentage points compared with the original high alkali mixed flotation process.

[0077] Among them, the technical documents of collectors BK404C, BK345A, and BK201 can be found in "Experimental Research on Optimization of Flotation Reagents for Porphyry Copper Ore in Yulong Copper Mine, Tibet" by Wu Minghai, Liu Wanfeng, etc. (Volume 33, Supplement 1, June 2024) in "China Mining".

[0078] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A method for beneficiation for improving the recovery rate of copper and molybdenum in copper-molybdenum ore, characterized in that: Follow these steps: (1) Grinding the copper-molybdenum ore; (2) The ore pulp after the grinding treatment in step (1) is subjected to a floatable roughing of copper, molybdenum, etc., and the following are added in sequence: lime to keep the pH value of the ore pulp at 10.0-10.5; a collector BK404C for copper minerals, the addition amount of which is 14-28 g / t; kerosene and BK345A for molybdenum minerals, the addition amounts of which are 30-40 g / t and 10-20 g / t, respectively; and a frother BK201, the addition amount of which is 7-14 g / t, to obtain a copper-molybdenum mixed rough concentrate I and a floatable roughing tailing of copper, molybdenum, etc.; (3) adding a copper mineral collector BK404C in an amount of 7-14 g / t to the copper, molybdenum and other floatable roughing tailings obtained in step (2); adding a molybdenum mineral collector BK345A in an amount of 4-8 g / t to carry out a copper, molybdenum and other floatable scavenging to obtain a copper, molybdenum and other floatable scavenging concentrate and tailings, and returning the scavenging concentrate to the copper, molybdenum and other floatable roughing operation; (4) When the copper, molybdenum and other floatable tailings slurry obtained in step (3) is subjected to copper enhanced roughing, the following are added in sequence: lime to keep the pH value of the tailings slurry at 11.0-11.5; BK404C, a collector for copper minerals, in an amount of 8-16 g / t; kerosene, a collector for molybdenum minerals, in an amount of 2-10 g / t; and BK201, a foaming agent, in an amount of 7-14 g / t, to obtain a copper-molybdenum mixed rough concentrate II and copper enhanced roughing tailings; (5) adding 4-8 g / t of copper mineral collector BK404C to the copper enhanced roughing tailings slurry obtained in step (4), performing copper enhanced primary scavenging, obtaining primary scavenging concentrate and primary scavenging tailings, and returning the primary scavenging concentrate to the copper enhanced roughing operation; (6) adding 2-4 g / t copper collector BK404C to the copper enhanced primary scavenging tailings slurry obtained in step (5), and performing copper enhanced secondary scavenging to obtain secondary scavenging concentrate and secondary scavenging tailings; the secondary scavenging concentrate is returned to the primary scavenging operation, and the secondary scavenging tailings are the final tailings, which are discharged into the tailings pond; (7) performing a primary concentration on the copper-molybdenum mixed roughing concentrate I obtained in step (2) to obtain a primary concentrated concentrate and a primary concentrated tailings, and returning the primary concentrated tailings to the copper-molybdenum and other floatable roughing operations; (8) The primary concentrated concentrate obtained in step (7) is subjected to secondary concentration to obtain a secondary concentrated concentrate and a secondary concentrated tailings, and the secondary concentrated tailings are returned to the primary concentration operation. The secondary concentrated concentrate is the copper-molybdenum mixed concentrate I. (9) performing a primary beneficiation on the copper-molybdenum mixed rough concentrate II obtained in step (4) to obtain a primary beneficiated concentrate and a primary beneficiated tailings, and returning the primary beneficiated tailings to the copper enhanced roughing operation; (10) subjecting the primary concentrated concentrate obtained in step (9) to secondary concentration to obtain secondary concentrated concentrate and secondary concentrated tailings, and returning the secondary concentrated tailings to the primary concentration operation; (11) The secondary concentrated concentrate obtained in step (10) is subjected to tertiary concentration to obtain tertiary concentrated concentrate and tertiary concentrated tailings. The tertiary concentrated tailings are returned to the secondary concentration operation. The tertiary concentrated concentrate is the copper-molybdenum mixed concentrate II.

2. The ore dressing method for improving the copper and molybdenum recovery rate of copper-molybdenum ore according to claim 1, characterized in that: In step 1, after grinding treatment, the ore flotation particle size is -0.074 mm, accounting for 65±3%, and the slurry concentration is 27%±3%.

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