A grinding-beneficiation combined unit and method for refractory sulfide lead-zinc ore

Abstract

This invention discloses a grinding-beneficiation integrated device and method for refractory sulfide lead-zinc ore, comprising a crushing system, a grinding system, a flotation system, and an acid-resistant tank. The crushing system includes a jaw crusher, a cone crusher, and a vibrating screen. The grinding system includes a spiral classifier, a ball mill, and a high-frequency vibrating fine screen. The flotation system includes a lead beneficiation device and a zinc beneficiation device, each comprising an aerated flotation column, two cyclone-static microbubble re-concentration groups, and two flotation machines. It employs a method of preferentially flotating lead followed by zinc, utilizing a digital display flow pump and a feed pipe to achieve a closed-loop circulation of scavenging or flotation. Finally, the tailings after zinc flotation are input into the acid-resistant tank for bacterial metallurgy. This invention features a high degree of process integration, good beneficiation effect, and environmental friendliness.

Description

Technical Field

[0001] This invention belongs to the field of mineral processing technology and relates to a grinding-beneficiation combined device and method for refractory sulfide lead-zinc ore. Background Technology

[0002] Difficult-to-process lead-zinc sulfide ores refer to ores containing lead and zinc minerals in the form of sulfides. Due to their complex mineralogical properties or other characteristics, their processing or extraction is quite challenging. Existing mining technologies often employ a single flotation method for beneficiation. However, these ores typically contain a large number of fine particles, which may affect the effective flotation process, or require specialized treatment technologies to pre-treat the ore before feeding it into the flotation stage. Furthermore, the presence of complex gangue minerals such as quartz, calcite, dolomite, or clay minerals in the ore may interfere with the flotation process and reduce the selectivity of the collector. Therefore, different flotation technologies and reagents are required for treatment. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a grinding-beneficiation combined device and method for refractory sulfide lead-zinc ore that is efficient in mineral processing, environmentally friendly, and highly integrated in process.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows:

[0005] A grinding-beneficiation unit for refractory sulfide lead-zinc ore includes a crushing system, a grinding system, a flotation system, and an acid-resistant tank. The crushing system includes a hopper, a conveying device, a jaw crusher, a cone crusher, and a vibrating screen. The conveying device connects the hopper, jaw crusher, cone crusher, and vibrating screen in series. The vibrating screen has a discharge port and a return chute on its right side. The return chute is connected to the cone crusher through the conveying device.

[0006] The grinding system includes a spiral classifier, a ball mill, and a high-frequency vibrating fine screen. The conveying device connects the spiral classifier, the ball mill, and the high-frequency vibrating fine screen in series. The high-frequency vibrating fine screen is equipped with a return sand trough and a screening outlet. The return sand trough is connected to the ball mill through the conveying device.

[0007] The flotation system includes a lead flotation device and a zinc flotation device. The lead flotation device includes a first aerated flotation column, a first cyclone-static microbubble flotation column, a first flotation machine, a second flotation machine, and a second cyclone-static microbubble flotation column. The zinc flotation device includes a second aerated flotation column, a third cyclone-static microbubble flotation column, a third flotation machine, a fourth flotation machine, and a fourth cyclone-static microbubble flotation column.

[0008] The screening outlet is connected to the feed inlet of the first aerated flotation column via a feed pipe. The overflow trough of the first aerated flotation column is connected to the first flotation machine. The first flotation machine is connected in series with the second flotation machine. The tailings discharge pipe of the second flotation machine is connected to the first flotation machine. The overflow trough of the second flotation machine is open to the outside.

[0009] The first aerated flotation column is connected in series with the first cyclone-static microbubble flotation column and the second cyclone-static microbubble flotation column via a feed pipe. The overflow trough of the first cyclone-static microbubble flotation column is connected to the first aerated flotation column. The overflow trough of the second cyclone-static microbubble flotation column is connected to the first cyclone-static microbubble flotation column. The tail outlet of the second cyclone-static microbubble flotation column is connected to the second aerated flotation column.

[0010] The second aerated flotation column is connected in series with the third cyclone-static microbubble flotation column and the fourth cyclone-static microbubble flotation column via a feed pipe. The overflow trough of the third cyclone-static microbubble flotation column is connected to the second aerated flotation column. The overflow trough of the fourth cyclone-static microbubble flotation column is connected to the third cyclone-static microbubble flotation column. The tail end of the fourth cyclone-static microbubble flotation column is connected to the acid-resistant tank via a feed pipe.

[0011] The overflow trough of the second aerated flotation column is connected to the third flotation machine, the third flotation machine is connected in series with the fourth flotation machine, the tailings discharge pipe of the fourth flotation machine is connected to the third flotation machine, and the overflow trough of the fourth flotation machine is open to the outside.

[0012] As a further technical improvement, the feed pipes described above are equipped with digital display flow pumps on the pipes connecting the various devices.

[0013] As a further technical improvement, a motor is installed above the acid-resistant tank. The motor is fixed to the top of the tank body by a bracket mounted on the sides of the acid-resistant tank. A rotating shaft is connected to the bottom of the motor and extends into the lower part of the acid-resistant tank. Several stirring blades are also connected to the rotating shaft.

[0014] As a further technical improvement, the method of using the above-described grinding-beneficiation combined unit for refractory sulfide lead-zinc ore includes the following steps:

[0015] (1) Crushing: The stone is fed into the hopper by the mine car and crushed for the first time by the jaw crusher. Then it is fed into the cone crusher by the conveying device. The cone crusher crushes the ore for the second time. After crushing, the ore is fed into the vibrating screen by the conveying device. The qualified particles are sent to the qualified material pile through the discharge port. The unqualified particles are returned to the cone crusher through the return chute. The final crushed product particle size is -12 mm.

[0016] (2) Grinding: The qualified material is fed into a spiral classifier for pre-classification. The qualified ore with a product density of -74μm is collected for subsequent processing to increase the production capacity of the grinding mill and prevent over-grinding. The unqualified ore is fed into a ball mill after adding grinding aids. The ball mill is precisely loaded with balls for fine grinding. After being sent out of the ball mill, it enters a high-frequency vibrating fine screen for inspection and classification. The unqualified product is sent out from the return sand trough and the return sand is sent back to the ball mill. The qualified product is transported to the next stage from the screening outlet. The final grinding product has a particle size of -74μm, accounting for 75% to 80%.

[0017] The grinding aid composition and dosage are as follows: sodium tripolyphosphate 0.6 kg / t; water glass 0.4 kg / t;

[0018] (3) Flotation:

[0019] ① Lead coarse selection:

[0020] The slurry is fed from the screening outlet into the first aerated flotation column through the feed pipe. Zinc sulfate 1000 g / t, sodium carbonate 500 g / t, 25# black reagent 40 g / t, and BK205 10 g / t are added for lead roughing. The lead roughing tailings are fed through the feed pipe and a digital display flow pump into the first cyclone-static microbubble flotation column for lead scavenging. The lead roughing froth enters the first flotation machine for lead cleaning. The zinc sulfate acts as a sphalerite inhibitor, the sodium sulfate acts as a pH adjuster to adjust the slurry pH to approximately 9, and the BK205 acts as a frother.

[0021] ② Lead selection:

[0022] Lead Refinement 1: Add 200g / t of zinc sulfate to the lead roughing froth and carry out lead refinement 1 in the first flotation machine. The tailings of lead refinement 1 are returned to the first aerated flotation column for further roughing, and the froth is conveyed to the second flotation machine.

[0023] Lead Refinement II: 100g / t of zinc sulfate is added to the foam from Lead Refinement I and lead refinement II is carried out in the second flotation machine; the tailings from lead refinement II are returned to the first flotation machine from the tailings discharge pipe of the second flotation machine through the feed pipe to repeat lead refinement I, and the foam is discharged from the overflow tank of the second flotation machine and collected and processed into lead concentrate.

[0024] ③ Lead scavenging:

[0025] Lead scavenging step 1: Lead roughing tailings are fed into the first cyclone-static microbubble flotation column via a feed pipe and digital display flow pump. 20g / t of 25# black reagent and 3g / t of BK205 are added for lead scavenging step 1. The tailings from lead scavenging step 1 enter the second cyclone-static microbubble flotation column for lead scavenging step 2. The froth is returned to the first aerated flotation column for lead roughing.

[0026] Lead scavenging II: The tailings from lead scavenging I enter the second cyclone-static microbubble flotation column and add BK205 2g / t for lead scavenging II. The foam is returned to the first cyclone-static microbubble flotation column, and the tailings enter the second aerated flotation column for zinc roughing.

[0027] ④ Zinc coarse selection:

[0028] The froth from lead scavenging enters the second aerated flotation column, where 5000 g / t of lime, 200 g / t of copper sulfate, 150 g / t of butyl xanthate, and 60 g / t of BK205 are added for zinc roughing. The zinc roughing tailings are pumped into the third cyclone-static microbubble flotation column for zinc scavenging. The zinc roughing froth then enters the third flotation machine for zinc cleaning. The butyl xanthate acts as a collector, the lime acts as a sulfur inhibitor and a pH adjuster to adjust the pulp pH to approximately 11, and the BK205 acts as a frother.

[0029] ⑤ Zinc Selection:

[0030] The third flotation machine adds 800g / t of lime for zinc refining I. The tailings from zinc refining I are returned to the second aerated flotation column for further roughing. The froth is then conveyed to the fourth flotation machine, where 600g / t of lime is added for zinc refining II.

[0031] The tailings from the second zinc beneficiation process are returned to the third flotation machine for repeated zinc beneficiation process one, and the foam collection process is used to produce zinc concentrate.

[0032] ⑥ Zinc scavenging:

[0033] Zinc roughing tailings are fed into the third cyclone-static microbubble flotation column by a feed pump, and 80g / t of butyl xanthate is added for zinc scavenging I. The tailings enter the fourth cyclone-static microbubble flotation column, and 50g / t of butyl xanthate is added for zinc scavenging II. The foam is returned to the second aerated flotation column for lead roughing.

[0034] The tailings from zinc scavenging step 1 enter the fourth cyclone-static microbubble flotation column, where 50 g / t of butyl xanthate is added for zinc scavenging step 2. The froth is returned to the third cyclone-static microbubble flotation column, and the tailings are discharged and collected for treatment.

[0035] (4) Bacterial metallurgy:

[0036] The tailings from the zinc scavenging process are discharged from the tailings outlet of the fourth cyclone-static microbubble flotation column into the acid-resistant tank. After the tank is filled with bacterial leachate, the motor is turned on for stirring and processing.

[0037] The bacterial strains used in the bacterial extract are a mixture of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Microspirilla ferrooxidans. The pH of the bacterial extract is 1.5-2.0, and the inoculum size is 10%.

[0038] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows:

[0039] 1. The addition of grinding aids in the grinding process of this invention improves the specific productivity of the ball mill and increases grinding efficiency. Furthermore, the grinding aids exhibit physical and chemical adsorption on the mineral surface, forming hydrogen bonds, which reduces the surface energy of mineral particles, promotes the fracture of defects and cracks, makes magnetite easier to break, improves the fluidity of the slurry, enhances the grinding effect, and results in finer particle size of the ground product.

[0040] 2. This invention uses a high-frequency vibrating fine screen instead of a spiral classifier to improve the classification quality. Spiral classifiers and hydrocyclones classify materials according to the sedimentation law, but their stable and fine classification performance is low. During the grinding process, they are prone to reverse enrichment in the return sand process, which aggravates the over-grinding of useful minerals. The high-frequency vibrating fine screen strictly classifies according to geometric dimensions, and can timely screen out qualified particle sizes, reducing the content of qualified particle sizes in the return sand.

[0041] 3. This invention uses a cyclone-static microbubble flotation column to increase the collision probability between bubbles and target minerals, prolong the contact time between bubbles and target minerals, promote mineralization, promote adhesion between microbubbles and fine-grained target minerals, and improve the flotation effect.

[0042] 4. In the flotation process of this invention, zinc is first suppressed and lead is floated, and then zinc is activated, which utilizes the difference in floatability between lead and zinc, resulting in good lead-zinc separation effect;

[0043] 5. The zinc tailings of the present invention are treated by bacterial metallurgy. Bacteria can penetrate into the tiny gaps in the tailings with water and concentrate the dispersed metal elements into usable metals. This method has high metallurgical efficiency and reduces environmental harm.

[0044] 6. This invention integrates grinding, flotation, and tailings treatment using bacteria, resulting in a highly integrated process with good efficiency and effectiveness. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of a grinding-beneficiation combined device for refractory sulfide lead-zinc ore according to the present invention.

[0046] Attached image labels:

[0047] 1-Hopper, 2-Conveying device, 3-Jaw crusher, 4-Cone crusher, 5-Vibrating screen, 501-Discharge port, 502-Return chute, 6-Spiral classifier, 7-Ball mill, 8-High-frequency vibrating fine screen, 801-Return sand chute, 802-Screening discharge port, 9-First aerated flotation column, 901-First aerated flotation column inlet, 902-First aerated flotation column overflow chute, 10-First cyclone-static microbubble flotation column, 1001-First cyclone-static microbubble flotation column overflow chute, 11-First flotation machine, 12-Second flotation machine, 1201-Second flotation machine tailings discharge pipe, 1202-Second flotation machine overflow chute, 13-Second cyclone-static microbubble flotation column, 1301-Second cyclone-static microbubble flotation column overflow chute Flow channel, 1302-Second cyclone-static microbubble flotation column tail outlet, 14-Second aerated flotation column, 1401-Second aerated flotation column overflow channel, 15-Third cyclone-static microbubble flotation column, 1501-Third cyclone-static microbubble flotation column overflow channel, 16-Third flotation machine, 17-Fourth flotation machine, 1701-Fourth flotation machine tailings discharge pipe, 1702-Fourth flotation machine overflow channel, 18-Fourth cyclone-static microbubble flotation column, 1801-Fourth cyclone-static microbubble flotation column overflow channel, 1802-Fourth cyclone-static microbubble flotation column tail outlet, 19-Feed pipe, 20-Acid-resistant tank, 2001-Motor, 2002-Support, 2003-Rotating shaft, 2004-Agitator blades, 21-Digital display flow pump. Detailed Implementation

[0048] The invention will now be further described with reference to the accompanying drawings. Example 1:

[0049] A grinding-beneficiation unit for refractory sulfide lead-zinc ore includes a crushing system, a grinding system, a flotation system, and an acid-resistant tank 20. The crushing system includes a hopper 1, a conveying device 2, a jaw crusher 3, a cone crusher 4, and a vibrating screen 5. The conveying device connects the hopper 1, jaw crusher 2, cone crusher 4, and vibrating screen 5 in series. The vibrating screen has a discharge port 501 and a return chute 502 on its right side. The return chute 502 is connected to the cone crusher 4 through the conveying device 2. The grinding system includes a spiral classifier 6, a ball mill 7, and a high-frequency vibrating fine screen 8. The conveying device 2 connects the spiral classifier 6, ball mill 7, and high-frequency vibrating fine screen 8 in series. The high-frequency vibrating fine screen 8 has a return sand chute 801 and a screening discharge port 802. The return sand chute 801 is connected to the ball mill 7 through the conveying device 2.

[0050] The flotation system includes a lead flotation unit and a zinc flotation unit. The lead flotation unit includes a first aerated flotation column 9, a first cyclone-static microbubble flotation column 10, a first flotation machine 11, a second flotation machine 12, and a second cyclone-static microbubble flotation column 13. The zinc flotation unit includes a second aerated flotation column 14, a third cyclone-static microbubble flotation column 15, a third flotation machine 16, a fourth flotation machine 17, and a fourth cyclone-static microbubble flotation column 18.

[0051] The screening outlet 802 is connected to the feed inlet 901 of the first aerated flotation column via the feed pipe 19. The overflow trough 902 of the first aerated flotation column is connected to the first flotation machine 11. The first flotation machine 11 is connected in series with the second flotation machine 12. The tailings discharge pipe 1201 of the second flotation machine is connected to the first flotation machine 11. The overflow trough 1202 of the second flotation machine leads to the outside.

[0052] The first aerated flotation column 9, the first cyclone-static microbubble flotation column 10, and the second cyclone-static microbubble flotation column 13 are connected in series via a feed pipe 19. The overflow trough 1001 of the first cyclone-static microbubble flotation column is connected to the first aerated flotation column 9. The overflow trough 1301 of the second cyclone-static microbubble flotation column is connected to the first cyclone-static microbubble flotation column 10. The tail outlet 1302 of the second cyclone-static microbubble flotation column is connected to the second aerated flotation column 14.

[0053] The second aerated flotation column 14, the third cyclone-static microbubble flotation column 15, and the fourth cyclone-static microbubble flotation column 18 are connected in series via a feed pipe 19. The overflow trough 1501 of the third cyclone-static microbubble flotation column is connected to the second aerated flotation column 14, and the overflow trough 1801 of the fourth cyclone-static microbubble flotation column is connected to the third cyclone-static microbubble flotation column 15. The tail outlet 1802 of the fourth cyclone-static microbubble flotation column is connected to the acid-resistant tank 20 via the feed pipe 19.

[0054] The overflow trough 1401 of the second aerated flotation column is connected to the third flotation machine 16. The third flotation machine 16 is connected in series with the fourth flotation machine 17. The tailings discharge pipe 1701 of the fourth flotation machine is connected to the third flotation machine 16. The overflow trough 1702 of the fourth flotation machine leads to the outside.

[0055] The method for grinding and beneficiating refractory sulfide lead-zinc ore using the above apparatus specifically includes the following steps:

[0056] (1) Crushing: The stone is fed into the hopper (1) by the mine car, and after being crushed for the first time by the jaw crusher (3), it is fed into the cone crusher (4) through the transport device (2); the cone crusher (4) crushes the ore for the second time, and the crushed ore is fed into the vibrating screen (5) through the transport device (2). The qualified particles are screened out and sent to the qualified material pile through the discharge port (501), and the unqualified particles are returned to the cone crusher (4) through the return chute (502); the final crushed product particle size is -12 mm.

[0057] (2) Grinding: The qualified material is fed into the spiral classifier (6) for pre-classification. The qualified ore with a product density of -74μm is collected for subsequent processing. The unqualified ore is fed into the ball mill (7) after adding grinding aid. The ball mill (7) is precisely loaded with balls for fine grinding. After being sent out from the ball mill (7), it enters the high-frequency vibrating fine screen (8) for inspection and classification. The unqualified product is sent out from the return sand tank (801) and the return sand is sent back to the ball mill (7). The qualified product is transported to the next stage from the screening outlet (802). The final grinding product has a particle size of -74μm, accounting for 75% to 80%.

[0058] The grinding aid composition and dosage are as follows: sodium tripolyphosphate 0.6 kg / t; water glass 0.4 kg / t;

[0059] (3) Flotation:

[0060] ① Lead coarse selection:

[0061] The slurry was fed from the screening outlet (802) through the feed pipe (19) into the first aerated flotation column (9), with 1000 g / t of zinc sulfate, 500 g / t of sodium carbonate, and 25 g / t of sodium carbonate added. # 40g / t of black powder and 10g / t of BK205 were used for lead roughing. The lead roughing tailings were fed into the first cyclone-static microbubble flotation column (10) by the feed pipe (19) and digital display flow pump (21) for lead scavenging. The lead roughing foam entered the first flotation machine (11) for lead cleaning.

[0062] ② Lead selection:

[0063] Lead Refinement 1: Add 200g / t of zinc sulfate to the lead roughing foam and carry out lead refinement 1 in the first flotation machine (11). The tailings of lead refinement 1 are returned to the first aerated flotation column (9) for further roughing. The foam is then transported to the second flotation machine (12).

[0064] Lead Refinement 2: 100g / t of zinc sulfate is added to the foam of lead refinement 1 and lead refinement 2 is carried out in the second flotation machine (12); the tailings of lead refinement 2 are returned from the tailings discharge pipe (1201) of the second flotation machine through the feed pipe (19) to the first flotation machine (11) to repeat lead refinement 1, and the foam is discharged from the overflow tank (1202) of the second flotation machine and collected and processed into lead concentrate;

[0065] ③ Lead scavenging:

[0066] Lead Scavenging 1: Lead roughing tailings are fed into the first cyclone-static microbubble flotation column (10) via feed pipe (19) and digital display flow pump (21), and 25 # Black powder 20g / t and BK205 3g / t are used for lead scavenging one. The tailings of lead scavenging one enter the second cyclone-static microbubble flotation column (13) for lead scavenging two. The foam is returned to the first aerated flotation column (9) for lead roughing.

[0067] Lead scavenging 2: The tailings from lead scavenging 1 enter the second cyclone-static microbubble flotation column (13) and add BK205 2g / t for lead scavenging 2. The foam returns to the first cyclone-static microbubble flotation column (10), and the tailings enter the second aerated flotation column (14) for zinc roughing.

[0068] ④ Zinc coarse selection:

[0069] The lead scavenging foam enters the second aerated flotation column (14), where 5000 g / t of lime, g / t of copper sulfate, 150 g / t of butyl xanthate and 60 g / t of BK205 are added for zinc roughing. The zinc roughing tailings are transported to the third cyclone-static microbubble flotation column (15) for zinc scavenging. The zinc roughing foam enters the third flotation machine (16) for zinc cleaning.

[0070] ⑤ Zinc Selection:

[0071] The third flotation machine (16) adds 800g / t of lime for zinc selection one. The tailings of zinc selection one are returned to the second aerated flotation column (14) for roughing. The foam is transported to the fourth flotation machine (17), where 600g / t of lime is added for zinc selection two.

[0072] The tailings from the second zinc beneficiation process are returned to the third flotation machine (16) for repeated zinc beneficiation process one, and the foam collection process is used to produce zinc concentrate.

[0073] ⑥ Zinc scavenging:

[0074] Zinc roughing tailings are fed into the third cyclone-static microbubble flotation column (15), and 80g / t of butyl xanthate is added for zinc scavenging one. The tailings are then fed into the fourth cyclone-static microbubble flotation column (18), and 50g / t of butyl xanthate is added for zinc scavenging two. The foam is returned to the second aerated flotation column (14) for lead roughing.

[0075] The tailings from zinc scavenging one enter the fourth cyclone-static microbubble flotation column (18), and 50g / t of butyl xanthate is added for zinc scavenging two. The foam is returned to the third cyclone-static microbubble flotation column (15), and the tailings are discharged and collected.

[0076] (4) Bacterial metallurgy:

[0077] The tailings from the zinc scavenging process are discharged from the tailings outlet (1802) of the fourth cyclone-static microbubble flotation column into the acid-resistant tank (20). After the tank is filled with bacterial leachate, the motor (2001) is turned on for stirring.

[0078] The bacterial strains used in the bacterial extract are a mixture of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Microspirilla ferrooxidans. The pH of the bacterial extract is 1.5-2.0, and the inoculum size is 10%.

[0079] The specific mineral processing results of this embodiment are shown in Table 1.

[0080] Table 1:

[0081] Example 2:

[0082] The difference from Example 1 is that a digital display flow pump 21 is installed on the feed pipe 19 on the pipes connecting each device. The grinding and beneficiation method for refractory sulfide lead-zinc ore using the above-described device is the same as in Example 1. Example 3:

[0083] The difference from Example 2 is that a motor 2001 is installed above the acid-resistant tank 20. The motor 2001 is fixed directly above the tank body by a bracket 2002 that surrounds the acid-resistant tank 20. A rotating shaft 2003 is connected below the motor 2001, extending into the lower part of the acid-resistant tank 20. The rotating shaft 2003 is also connected to several stirring blades 2004. This embodiment uses the above-described device to perform the grinding and beneficiation method for refractory sulfide lead-zinc ore, which is the same as in Example 2.

[0084] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description; it is neither necessary nor possible to exhaustively list all possible implementations; however, obvious variations or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A grinding-beneficiation method for refractory sulfide lead-zinc ore, characterized in that: The grinding-beneficiation unit for refractory sulfide lead-zinc ore specifically includes the following steps: (1) Crushing: The stone is fed into the hopper (1) by the mine car, and after being crushed for the first time by the jaw crusher (3), it is fed into the cone crusher (4) through the transport device (2); the cone crusher (4) crushes the ore for the second time, and the crushed ore is fed into the vibrating screen (5) through the transport device (2). The qualified particles are screened out and sent to the qualified material pile through the discharge port (501), and the unqualified particles are returned to the cone crusher (4) through the return chute (502); the final crushed product particle size is -12 mm. (2) Grinding: The qualified material is fed into the spiral classifier (6) for pre-classification. The qualified ore with a product density of -74μm is collected for subsequent processing. The unqualified ore is fed into the ball mill (7) after adding grinding aid. The ball mill (7) is precisely loaded with balls for fine grinding. After being sent out from the ball mill (7), it enters the high-frequency vibrating fine screen (8) for inspection and classification. The unqualified product is sent out from the return sand tank (801) and the return sand is sent back to the ball mill (7). The qualified product is transported to the next stage from the screening outlet (802). The final grinding product has a particle size of -74μm, accounting for 75% to 80%. The grinding aid composition and dosage are as follows: sodium tripolyphosphate 0.6 kg / t; water glass 0.4 kg / t; (3) Flotation: ① Lead coarse selection: The slurry was fed from the screening outlet (802) through the feed pipe (19) into the first aerated flotation column (9), with 1000 g / t of zinc sulfate, 500 g / t of sodium carbonate, and 25 g / t of sodium carbonate added. # 40g / t of black powder and 10g / t of BK205 were used for lead roughing. The lead roughing tailings were fed into the first cyclone-static microbubble flotation column (10) by the feed pipe (19) and digital display flow pump (21) for lead scavenging. The lead roughing foam entered the first flotation machine (11) for lead cleaning. ② Lead selection: Lead Refinement 1: Add 200g / t of zinc sulfate to the lead roughing foam and carry out lead refinement 1 in the first flotation machine (11). The tailings of lead refinement 1 are returned to the first aerated flotation column (9) for further roughing. The foam is then transported to the second flotation machine (12). Lead Refinement 2: 100g / t of zinc sulfate is added to the foam of lead refinement 1 and lead refinement 2 is carried out in the second flotation machine (12); the tailings of lead refinement 2 are returned from the tailings discharge pipe (1201) of the second flotation machine through the feed pipe (19) to the first flotation machine (11) to repeat lead refinement 1, and the foam is discharged from the overflow tank (1202) of the second flotation machine and collected and processed into lead concentrate; ③ Lead scavenging: Lead Scavenging 1: Lead roughing tailings are fed into the first cyclone-static microbubble flotation column (10) via feed pipe (19) and digital display flow pump (21), and 25 # Black powder 20g / t and BK205 3g / t are used for lead scavenging one. The tailings of lead scavenging one enter the second cyclone-static microbubble flotation column (13) for lead scavenging two. The foam is returned to the first aerated flotation column (9) for lead roughing. Lead scavenging 2: The tailings from lead scavenging 1 enter the second cyclone-static microbubble flotation column (13) and add BK205 2g / t for lead scavenging 2. The foam returns to the first cyclone-static microbubble flotation column (10), and the tailings enter the second aerated flotation column (14) for zinc roughing. ④ Zinc coarse selection: The tailings from lead scavenging II enter the second aerated flotation column (14), where 5000g / t of lime, 200g / t of copper sulfate, 150g / t of butyl xanthate and 60g / t of BK205 are added for zinc roughing. The zinc roughing tailings are then fed into the third cyclone-static microbubble flotation column (15) for zinc scavenging I. The zinc roughing froth enters the third flotation machine (16) for zinc cleaning. ⑤ Zinc Selection: The third flotation machine (16) adds 800g / t of lime for zinc selection one. The tailings of zinc selection one are returned to the second aerated flotation column (14) for roughing. The foam is transported to the fourth flotation machine (17), where 600g / t of lime is added for zinc selection two. The tailings from the second zinc beneficiation process are returned to the third flotation machine (16) for repeated zinc beneficiation process one, and the foam collection process is used to produce zinc concentrate. ⑥ Zinc scavenging: The zinc roughing tailings are fed into the third cyclone-static microbubble flotation column (15), and 80g / t of butyl xanthate is added for zinc scavenging one. The tailings are then fed into the fourth cyclone-static microbubble flotation column (18), and 50g / t of butyl xanthate is added for zinc scavenging two. The foam is returned to the second aerated flotation column (14) for continued zinc roughing. The tailings from zinc scavenging one enter the fourth cyclone-static microbubble flotation column (18), and 50g / t of butyl xanthate is added for zinc scavenging two. The foam is returned to the third cyclone-static microbubble flotation column (15), and the tailings are discharged and collected. (4) Bacterial metallurgy: The tailings from the zinc scavenging process are discharged from the tailings outlet (1802) of the fourth cyclone-static microbubble flotation column into the acid-resistant tank (20). After the tank is filled with bacterial leachate, the motor (2001) is turned on for stirring. The bacterial strains used in the bacterial extract are a mixture of Thiobacillus ferrooxidans, Thiobacillus thiooxidans and Microspirilla ferrooxidans. The pH of the bacterial extract is 1.5-2.0, and the inoculum size is 10%.

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