Lead-zinc ore dense medium grading selection-flotation combined separation system
The combined heavy media classification and flotation separation system has solved the problem of precise separation of lead-zinc ores with a wide particle size range, achieving efficient separation and low-cost production, and improving metal recovery rate and equipment operating efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-25
- Publication Date
- 2026-03-31
AI Technical Summary
Existing heavy media separation technology struggles to achieve precise separation when processing lead-zinc ores with a wide particle size range, resulting in poor separation performance, reduced resource recovery rates, and increased complexity and cost of the mineral processing process.
The heavy media classification-flotation combined separation system is adopted, which includes a heavy media separation system and a flotation system. Through the combination of crushing and screening, heavy media coarse and fine particle separation units and fine ore water treatment unit, it can achieve efficient separation and precise recovery of ores of different particle sizes.
It improves sorting accuracy and efficiency, reduces the amount of floating ore fed into the mill, lowers production costs, increases metal recovery rate, optimizes the dilute media treatment process, and improves the operating efficiency and water resource utilization rate of heavy media sorting equipment.
Smart Images
Figure CN224057596U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lead-zinc ore beneficiation technology, specifically to a combined heavy media classification-flotation separation system for lead-zinc ore. Background Technology
[0002] As is well known, lead-zinc ore, as a crucial non-ferrous metal mineral resource, occupies an irreplaceable and key position in the modern industrial system. Lead, with its excellent chemical stability and electrical conductivity, is widely used in industries such as batteries, chemicals, and cable sheathing; zinc, due to its outstanding corrosion resistance and alloy strengthening properties, enjoys huge market demand in galvanizing, alloy manufacturing, and electronics. With the booming development of global industry, the demand for lead-zinc ore continues to grow, making efficient and environmentally friendly mineral processing technologies a core focus of industry development.
[0003] In lead-zinc ore beneficiation, pre-disposal technology has become an important means to improve beneficiation efficiency and reduce costs, among which heavy media disposal technology is highly favored. Heavy media disposal technology utilizes the density differences of heavy media to effectively separate some gangue minerals, achieving pre-disposal and reducing the amount of ore required for subsequent grinding and flotation operations, thereby lowering production costs. However, current heavy media beneficiation technology has certain limitations when processing lead-zinc ore. For lead-zinc ores with a wide particle size range, the significant differences in the kinematic characteristics of ores of different sizes in heavy media make precise separation difficult, resulting in poor separation effects. This not only reduces resource recovery rates but also increases the complexity and cost of subsequent beneficiation processes. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a lead-zinc ore heavy media classification-flotation combined separation system and separation process that uses a special heavy media separation process for ores of different particle sizes, effectively improves separation accuracy and efficiency, reduces the amount of flotation ore fed into the mill, lowers production costs, and increases metal recovery rate, so as to meet the growing industrial demand and environmental protection requirements.
[0005] The technical solution adopted by this invention to solve its technical problem is:
[0006] A combined heavy media classification and flotation system for lead-zinc ore is characterized by comprising a heavy media separation system and a flotation system. The heavy media separation system includes a crushing and screening unit, a coarse-grained heavy media separation unit, a fine-grained heavy media separation unit, and a powder ore water treatment unit. The crushing and screening unit outlets are divided into a coarse-grained outlet, a fine-grained outlet, and a powder ore outlet. The coarse-grained outlet is connected to the coarse-grained heavy media separation unit, the fine-grained outlet is connected to the fine-grained heavy media separation system, and the powder ore outlet... The outlet is connected to the ore powder water treatment unit. The coarse-grained gravity separation tailings outlet of the heavy medium coarse-grained separation unit yields coarse-grained gravity separation tailings, and the fine-grained gravity separation tailings outlet of the heavy medium fine-grained separation unit yields fine-grained gravity separation tailings. The coarse-grained gravity separation concentrate outlet of the heavy medium coarse-grained separation unit, the fine-grained gravity separation concentrate outlet of the heavy medium fine-grained separation unit, and the concentrated ore powder outlet of the ore powder water treatment unit are respectively connected to the flotation system. The flotation system yields flotation Pb concentrate, flotation Zn concentrate, and flotation tailings.
[0007] The crushing and screening unit of this invention includes a crushing device, a feeding chute, a double-layer linear vibrating classifying screen, an AB coarse-particle discharge chute, a BC fine-particle discharge chute, and a -C powder ore under-screen chute. The outlet of the crushing device is connected to the inlet of the feeding chute, the outlet of the feeding chute is connected to the inlet of the double-layer linear vibrating classifying screen, the AB coarse-particle discharge outlet of the double-layer linear vibrating classifying screen is connected to the inlet of the AB coarse-particle discharge chute, the outlet of the AB coarse-particle discharge chute is connected to the inlet of the heavy media coarse-particle separation unit, the BC fine-particle discharge outlet of the double-layer linear vibrating classifying screen is connected to the inlet of the BC fine-particle discharge chute, the outlet of the BC fine-particle discharge chute is connected to the inlet of the heavy media fine-particle separation unit, the under-screen outlet of the double-layer linear vibrating classifying screen is connected to the inlet of the -C powder ore under-screen chute, and the outlet of the -C powder ore under-screen chute is connected to the powder ore water treatment unit.
[0008] The heavy media coarse-grained separation unit of this invention includes a coarse-grained heavy media mixing tank, a coarse-grained heavy media hydrocyclone, a coarse-grained concentrate fixed screen, a coarse-grained concentrate desliming screen, a coarse-grained tailings fixed screen, and a coarse-grained tailings desliming screen. The inlet of the coarse-grained heavy media mixing tank is connected to the coarse-grained outlet of the crushing and screening unit. The outlet of the coarse-grained heavy media mixing tank is connected to the coarse-grained heavy media hydrocyclone via a coarse-grained mixing pump. The underflow outlet and overflow outlet of the coarse-grained heavy media hydrocyclone are respectively connected to the coarse-grained concentrate fixed screen. The inlet of the coarse-grained concentrate fixed screen and the inlet of the coarse-grained tailings fixed screen are connected. The undersize products of the coarse-grained concentrate fixed screen and the coarse-grained tailings fixed screen are respectively connected to the coarse-grained heavy medium mixing tank. The oversize products of the coarse-grained concentrate fixed screen and the coarse-grained tailings fixed screen are respectively connected to the inlet of the coarse-grained concentrate desliming screen and the inlet of the coarse-grained tailings desliming screen. The outlet of the oversize product of the coarse-grained concentrate desliming screen is used as coarse-grained concentrate and directly enters the flotation system. The oversize material of the coarse-grained tailings desliming screen is used as coarse-grained gravity separation tailings and is sold or stored.
[0009] The heavy media fine-particle separation unit of this invention includes a fine-particle heavy media mixing tank, a fine-particle heavy media hydrocyclone, a fine-particle concentrate fixed screen, a fine-particle concentrate desliming screen, a fine-particle tailings fixed screen, and a fine-particle tailings desliming screen. The inlet of the fine-particle heavy media mixing tank is connected to the fine-particle outlet of the crushing and screening unit. The outlet of the fine-particle heavy media mixing tank is connected to the fine-particle heavy media hydrocyclone via a fine-particle mixing pump. The underflow outlet and overflow outlet of the fine-particle heavy media hydrocyclone are respectively connected to the fine-particle concentrate fixed screen. The inlet of the fixed screen is connected to the inlet of the fine-grained tailings screen. The undersize products of the fixed screens of fine-grained concentrate and fine-grained tailings are respectively connected to the fine-grained heavy media mixing tank. The oversize products of the fixed screens of fine-grained concentrate and fine-grained tailings are respectively connected to the inlet of the fine-grained concentrate desliming screen and the inlet of the fine-grained tailings desliming screen. The outlet of the oversize product of the fine-grained concentrate desliming screen is used as fine-grained concentrate and directly enters the flotation system. The oversize material of the fine-grained tailings desliming screen is used as fine-grained gravity separation tailings and is sold or stored.
[0010] Both the coarse-grained heavy media separation unit and the fine-grained heavy media separation unit of the present invention are equipped with qualified media distributors. The inlet of the qualified media distributor is connected to the under-screen outlet of the coarse-grained concentrate fixed screen, the under-screen outlet of the coarse-grained tailings fixed screen, the under-screen outlet of the fine-grained concentrate fixed screen, and the under-screen outlet of the fine-grained tailings fixed screen, respectively. The outlet of the qualified media distributor is connected to the inlet of the coarse-grained heavy media mixing tank and the inlet of the fine-grained heavy media mixing tank, respectively.
[0011] The heavy medium coarse-particle separation unit and the heavy medium fine-particle separation unit of the present invention are both equipped with a dilute medium tank, a magnetic separator, and a magnetic tailings water thickening hydrocyclone. The inlet of the dilute medium tank is connected to the undersize product outlet of the coarse-particle concentrate desliming screen, the coarse-particle tailings desliming screen, the fine-particle concentrate desliming screen, and the fine-particle tailings desliming screen, respectively. The outlet of the dilute medium tank is connected to the inlet of the magnetic separator via a dilute medium pump. The magnetic product outlet of the magnetic separator is connected to the inlet of the qualified medium distributor via a pipeline. The non-magnetic product outlet of the magnetic separator is connected to the inlet of the magnetic tailings water thickening hydrocyclone via a magnetic tailings water slurry pump. The overflow outlet of the magnetic tailings water thickening hydrocyclone is connected to the spray water of the double-layer linear vibrating classifying screen. The underflow outlet of the magnetic tailings water thickening hydrocyclone is connected to the fine ore water treatment unit.
[0012] The powder ore water treatment unit of the present invention includes a fine-particle feed box, a fine-particle thickening hydrocyclone, and a thickener. The inlet of the fine-particle feed box is connected to the powder ore outlet of the double-layer linear vibrating classifier. The outlet of the fine-particle feed box is connected to the fine-particle thickening hydrocyclone via a fine-particle slurry pump. The overflow outlet of the fine-particle thickening hydrocyclone is connected to the inlet of the thickener. The underflow outlet of the fine-particle thickening hydrocyclone is connected to the flotation system.
[0013] The flotation system of this invention includes a ball mill, a flotation mixing tank, a roughing flotation unit, a Pb flotation unit, a Zn flotation unit, and a tailings flotation unit. The inlet of the ball mill is connected to the oversize product outlet of the coarse-grained concentrate desliming screen, the oversize product outlet of the fine-grained concentrate desliming screen, and the underflow outlet of the fine-grained thickener hydrocyclone, respectively. The outlet of the ball mill is connected to the inlet of the flotation mixing tank, and the outlet of the flotation mixing tank is connected to the roughing flotation unit. The A-foam product outlet of the roughing flotation unit is connected to the Pb flotation unit, the B-foam product outlet of the roughing flotation unit is connected to the Zn flotation unit, and the in-tank product outlet of the roughing flotation unit is connected to the tailings flotation unit.
[0014] The Pb flotation unit of the present invention includes a first Pb flotation unit, a second Pb flotation unit, and a third Pb flotation unit. The feed inlet of the first Pb flotation unit is connected to the froth product outlet of the rougher flotation unit. The froth product outlet of the first Pb flotation unit is connected to the inlet of the second Pb flotation unit. The froth product outlet of the second Pb flotation unit is connected to the inlet of the third Pb flotation unit. The froth product of the third Pb flotation unit is flotation Pb concentrate. The in-tank product outlet of the first Pb flotation unit is connected to the inlet of the rougher flotation unit. The in-tank product outlet of the second Pb flotation unit is connected to the inlet of the first Pb flotation unit. The in-tank product outlet of the third Pb flotation unit is connected to the inlet of the second Pb flotation unit.
[0015] The Zn flotation unit of the present invention includes a first Zn flotation unit, a second Zn flotation unit, and a third Zn flotation unit. The feed inlet of the first Zn flotation unit is connected to the froth product outlet of the rougher flotation unit. The froth product outlet of the first Zn flotation unit is connected to the inlet of the second Zn flotation unit. The froth product of the second Zn flotation unit is connected to the inlet of the third Zn flotation unit. The froth product of the third Zn flotation unit is flotation Zn concentrate. The in-tank product outlet of the first Zn flotation unit is connected to the inlet of the rougher flotation unit. The in-tank product outlet of the second Zn flotation unit is connected to the inlet of the first Zn flotation unit. The in-tank product outlet of the third Zn flotation unit is connected to the inlet of the second Zn flotation unit.
[0016] The tailings flotation unit of the present invention includes a first tailings flotation unit and a second tailings flotation unit. The feed inlet of the first tailings flotation unit is connected to the product outlet of the roughing flotation unit. The product outlet of the first tailings flotation unit is connected to the inlet of the second tailings flotation unit. The product outlet of the second tailings flotation unit is the flotation tailings product. The froth product outlet of the first tailings flotation unit is connected to the inlet of the roughing flotation unit. The froth product outlet of the second tailings flotation unit is connected to the inlet of the first tailings flotation unit.
[0017] Beneficial effects:
[0018] (1) The heavy media classification process adopted in this invention can directly discard tailings with a grade lower than the industry standard. First, it reduces the amount of ore entering the grinding and flotation process and lowers the production cost. Second, the heavy separation tailings produced can be stockpiled or sold directly, and the funds can be quickly recovered.
[0019] (2) The heavy medium classification and sorting system used in this invention can eject waste rock containing "interfering ions" and reduce the "interfering ions" (Ca). 2+ Mg 2+ (etc.) to reduce interference with flotation operations and improve the grade of flotation concentrate.
[0020] (3) The heavy medium classification and beneficiation system used in this invention can achieve efficient separation of coarse and fine particles, which improves the separation accuracy and efficiency of heavy medium beneficiation.
[0021] (4) The optimization of the heavy medium classification and selection system and the heavy medium sorting system in this invention have optimized the processing technology of dilute medium compared with the original two traditional heavy medium systems. While ensuring efficient sorting, the operating cost of heavy medium sorting equipment has been reduced.
[0022] (5) In this invention, the magnetic tail water in the heavy medium classification and selection system is treated by the magnetic tail water thickener hydrocyclone. The overflow of the magnetic tail water thickener hydrocyclone is used as the screen water of the classification screen in the heavy medium system, which improves the utilization rate of the internal circulating water of the heavy medium system and saves the construction cost of the thickener.
[0023] (6) In this invention, the return water of the thickener in the ore water treatment system is used as the water for the heavy medium system. This process is an independent water process route, which avoids the interference caused by the return water containing flotation reagents in the grinding and flotation system entering the heavy medium system.
[0024] (7) In this invention, the underflow of the fine-particle thickener hydrocyclone in the fine ore water treatment system is fed into the mill feed end, which increases the concentration of fine-particle material entering the mill flotation system, ensures the grinding concentration of the mill, stabilizes the balance of the mill flotation water process, and truly realizes the combined beneficiation process of the heavy media beneficiation system and the mill flotation system.
[0025] (8) In the ore water treatment system of the present invention, the underflow of the thickener is fed into the discharge end of the mill. The fineness of the underflow of the thickener is more than 95% of -200 mesh, which reduces the over-grinding of the mill and improves the efficiency of subsequent flotation.
[0026] (9) The present invention has the advantages of improving sorting accuracy and efficiency, reducing the amount of floating ore fed into the mill, reducing production costs, and increasing metal recovery rate due to the use of the above system. Attached Figure Description
[0027] Figure 1 This is a system schematic diagram of the present invention. Detailed Implementation
[0028] The present invention will be further described below with reference to the accompanying drawings:
[0029] As shown in the attached figure, a combined heavy media classification and flotation system for lead-zinc ore is characterized by comprising a heavy media separation system and a flotation system. The heavy media separation system includes a crushing and screening unit, a coarse-grained heavy media separation unit, a fine-grained heavy media separation unit, and a fine ore water treatment unit. The crushing and screening unit outlets are divided into a coarse-grained outlet, a fine-grained outlet, and a fine ore outlet. The coarse-grained outlet is connected to the coarse-grained heavy media separation unit, and the fine-grained outlet is connected to the fine-grained heavy media separation system. The fine ore outlet is connected to the fine ore water treatment unit. The coarse gravity separation tailings outlet of the heavy medium coarse particle separation unit yields coarse gravity separation tailings, and the fine gravity separation tailings outlet of the heavy medium fine particle separation unit yields fine gravity separation tailings. The coarse gravity separation concentrate outlet of the heavy medium coarse particle separation unit, the fine gravity separation concentrate outlet of the heavy medium fine particle separation unit, and the concentrated fine ore outlet of the fine ore water treatment unit are respectively connected to the flotation system. The flotation system yields flotation Pb concentrate, flotation Zn concentrate, and flotation tailings.
[0030] Furthermore, the crushing and screening unit includes a crushing device, a feeding chute, a double-layer linear vibrating classifying screen 1, an ab coarse-grained discharge chute, a bc fine-grained discharge chute, and a -c powder ore under-screen chute. The outlet of the crushing device is connected to the inlet of the feeding chute, the outlet of the feeding chute is connected to the inlet of the double-layer linear vibrating classifying screen 1, the ab coarse-grained discharge outlet of the double-layer linear vibrating classifying screen 1 is connected to the inlet of the ab coarse-grained discharge chute, the outlet of the ab coarse-grained discharge chute is connected to the inlet of the heavy medium coarse-grained separation unit, the bc fine-grained discharge outlet of the double-layer linear vibrating classifying screen 1 is connected to the inlet of the bc fine-grained discharge chute, the outlet of the bc fine-grained discharge chute is connected to the inlet of the heavy medium fine-grained separation unit, the under-screen outlet of the double-layer linear vibrating classifying screen 1 is connected to the inlet of the -c powder ore under-screen chute, and the outlet of the -c powder ore under-screen chute is connected to the powder ore water treatment unit.
[0031] Furthermore, the heavy media coarse-grained separation unit includes a coarse-grained heavy media mixing tank 3, a coarse-grained heavy media hydrocyclone 4, a coarse-grained concentrate fixed screen 5, a coarse-grained concentrate desliming screen 6, a coarse-grained tailings fixed screen 7, and a coarse-grained tailings desliming screen 8. The inlet of the coarse-grained heavy media mixing tank 3 is connected to the coarse-grained outlet of the crushing and screening unit. The outlet of the coarse-grained heavy media mixing tank 3 is connected to the coarse-grained heavy media hydrocyclone 4 via a coarse-grained mixing pump. The underflow outlet and overflow outlet of the coarse-grained heavy media hydrocyclone 4 are respectively connected to the coarse-grained concentrate fixed screen. The inlet of screen 5 is connected to the inlet of coarse-grained tailings fixed screen 7. The undersize products of coarse-grained concentrate fixed screen 5 and coarse-grained tailings fixed screen 7 are respectively connected to coarse-grained heavy medium mixing tank 3. The oversize products of coarse-grained concentrate fixed screen 5 and coarse-grained tailings fixed screen 7 are respectively connected to the inlet of coarse-grained concentrate desliming screen 6 and coarse-grained tailings desliming screen 8. The outlet of the oversize product of coarse-grained concentrate desliming screen 6 is directly fed into the flotation system as coarse-grained concentrate. The oversize material of coarse-grained tailings desliming screen 8 is coarse-grained gravity separation tailings for sale or storage.
[0032] Furthermore, the heavy media fine-particle separation unit includes a fine-particle heavy media mixing tank 9, a fine-particle heavy media hydrocyclone 10, a fine-particle concentrate fixed screen 11, a fine-particle concentrate desliming screen 12, a fine-particle tailings fixed screen 13, and a fine-particle tailings desliming screen 14. The inlet of the fine-particle heavy media mixing tank 9 is connected to the fine-particle outlet of the crushing and screening unit. The outlet of the fine-particle heavy media mixing tank 9 is connected to the fine-particle heavy media hydrocyclone 10 via a fine-particle mixing pump. The underflow outlet and overflow outlet of the fine-particle heavy media hydrocyclone 10 are respectively connected to the fine-particle concentrate fixed screen 11. The inlet of 1 is connected to the inlet of the fine-grained tailings fixed screen 13. The undersize products of the fine-grained concentrate fixed screen 11 and the fine-grained tailings fixed screen 13 are respectively connected to the fine-grained heavy medium mixing tank 9. The oversize products of the fine-grained concentrate fixed screen 11 and the fine-grained tailings fixed screen 13 are respectively connected to the inlet of the fine-grained concentrate desliming screen 12 and the inlet of the fine-grained tailings desliming screen 14. The outlet of the oversize product of the fine-grained concentrate desliming screen 12 is directly fed into the flotation system as fine-grained concentrate. The oversize material of the fine-grained tailings desliming screen 14 is fine-grained gravity separation tailings for sale or storage.
[0033] Furthermore, both the coarse-grained heavy media separation unit and the fine-grained heavy media separation unit are equipped with qualified media distributors 2. The inlet of the qualified media distributor 2 is connected to the under-screen outlet of the coarse-grained concentrate fixed screen 5, the under-screen outlet of the coarse-grained tailings fixed screen 7, the under-screen outlet of the fine-grained concentrate fixed screen 11, and the under-screen outlet of the fine-grained tailings fixed screen 13, respectively. The outlet of the qualified media distributor 2 is connected to the inlet of the coarse-grained heavy media mixing tank 3 and the inlet of the fine-grained heavy media mixing tank 9, respectively.
[0034] Furthermore, both the heavy medium coarse-particle separation unit and the heavy medium fine-particle separation unit are equipped with a dilute medium tank 15, a magnetic separator 16, and a magnetic tailings water thickener 17. The inlet of the dilute medium tank 15 is connected to the undersize product outlet of the coarse-particle concentrate desliming screen 6, the coarse-particle tailings desliming screen 8, the fine-particle concentrate desliming screen 12, and the fine-particle tailings desliming screen, respectively. The outlet of the dilute medium tank 15 is connected to the inlet of the magnetic separator 16 via a dilute medium pump. The magnetic product outlet of the magnetic separator 16 is connected to the inlet of the qualified medium distributor 2 via a pipeline. The non-magnetic product outlet of the magnetic separator 16 is connected to the inlet of the magnetic tailings water thickener 17 via a magnetic tailings water slurry pump. The overflow outlet of the magnetic tailings water thickener 17 is connected to the spray water of the double-layer linear vibrating classifying screen 1. The underflow outlet of the magnetic tailings water thickener 17 is connected to the powder ore water treatment unit.
[0035] Furthermore, the powdered ore water treatment unit includes a fine-particle feed box 18, a fine-particle thickening hydrocyclone 19, and a thickener 20. The inlet of the fine-particle feed box 18 is connected to the powdered ore outlet of the double-layer linear vibrating classifying screen 1. The outlet of the fine-particle feed box 18 is connected to the fine-particle thickening hydrocyclone 19 via a fine-particle slurry pump. The overflow outlet of the fine-particle thickening hydrocyclone 19 is connected to the inlet of the thickener 20. The underflow outlet of the fine-particle thickening hydrocyclone 19 is connected to the flotation system.
[0036] Furthermore, the flotation system includes a ball mill 21, a flotation mixing tank 22, a roughing flotation unit 23, a Pb flotation unit, a Zn flotation unit, and a tailings flotation unit. The inlet of the ball mill 21 is connected to the oversize product outlet of the coarse-grained concentrate desliming screen 6, the oversize product outlet of the fine-grained concentrate desliming screen 12, and the underflow outlet of the fine-grained thickening hydrocyclone 19, respectively. The outlet of the ball mill 21 is connected to the inlet of the flotation mixing tank 22. The outlet of the flotation mixing tank 22 is connected to the roughing flotation unit 23. The A-foam product outlet of the roughing flotation unit 23 is connected to the Pb flotation unit. The B-foam product outlet of the roughing flotation unit 23 is connected to the Zn flotation unit. The in-tank product outlet of the roughing flotation unit 23 is connected to the tailings flotation unit.
[0037] Furthermore, the Pb flotation unit includes a first Pb flotation unit 24, a second Pb flotation unit 25, and a third Pb flotation unit 26. The feed inlet of the first Pb flotation unit 24 is connected to the froth product outlet of the roughing flotation unit 23. The froth product outlet of the first Pb flotation unit 24 is connected to the inlet of the second Pb flotation unit 25. The froth product outlet of the second Pb flotation unit 25 is connected to the inlet of the third Pb flotation unit 26. The froth product of the third Pb flotation unit 26 is flotation Pb concentrate. The in-tank product outlet of the first Pb flotation unit 24 is connected to the inlet of the roughing flotation unit 23. The in-tank product outlet of the second Pb flotation unit 25 is connected to the inlet of the first Pb flotation unit 24. The in-tank product outlet of the third Pb flotation unit 26 is connected to the inlet of the second Pb flotation unit 25.
[0038] Furthermore, the Zn flotation unit includes a first Zn flotation unit 27, a second Zn flotation unit 28, and a third Zn flotation unit 29. The feed inlet of the first Zn flotation unit 27 is connected to the froth product outlet of the roughing flotation unit 23. The froth product outlet of the first Zn flotation unit 27 is connected to the inlet of the second Zn flotation unit 28. The froth product outlet of the second Zn flotation unit 28 is connected to the inlet of the third Zn flotation unit 29. The froth product of the third Zn flotation unit 29 is flotation Zn concentrate. The in-tank product outlet of the first Zn flotation unit 27 is connected to the inlet of the roughing flotation unit 23. The in-tank product outlet of the second Zn flotation unit 28 is connected to the inlet of the first Zn flotation unit 27. The in-tank product outlet of the third Zn flotation unit 29 is connected to the inlet of the second Zn flotation unit 28.
[0039] Furthermore, the tailings flotation unit includes a first tailings flotation unit 30 and a second tailings flotation unit 31. The feed inlet of the first tailings flotation unit 30 is connected to the in-tank product outlet of the roughing flotation unit 23. The in-tank product outlet of the first tailings flotation unit 30 is connected to the inlet of the second tailings flotation unit 31. The in-tank product outlet of the second tailings flotation unit 31 is the flotation tailings product. The froth product outlet of the first tailings flotation unit 30 is connected to the inlet of the roughing flotation unit 23. The froth product outlet of the second tailings flotation unit 31 is connected to the inlet of the first tailings flotation unit 30.
[0040] The sorting process steps are as follows:
[0041] (1) Preparation of a combined heavy media classification-flotation separation system for lead-zinc ore;
[0042] (2) Sorting: First, the crushed raw ore is screened using a double-layer grading screen. The products are coarse-grained products, fine-grained products, and powdered ore products. The coarse-grained products enter the coarse-grained heavy media separation system, the fine-grained products enter the fine-grained heavy media separation system, and the powdered ore products enter the powdered ore water treatment system. The heavy media in the coarse-grained heavy media mixing tank 3 and the fine-grained heavy media mixing tank 9 is ferrosilicon powder. The heavy media in the qualified media distributor 2 is ferrosilicon powder. The ferrosilicon powder has a magnetic content ≥90%, a fineness of -325 mesh accounting for 90%-97%, and a -400 mesh content of 85%-90%. The density of the heavy media suspension in the coarse-grained heavy media mixing tank 3 is 1.90-3.20 g / cm³, and the density of the heavy media suspension in the fine-grained heavy media mixing tank 9 is 1.75-2.50 g / cm³. After the coarse and fine particles are thoroughly mixed, they are fed into the coarse-particle heavy media hydrocyclone 4 and the fine-particle heavy media hydrocyclone 10, respectively, via a coarse-particle mixing pump and a fine-particle mixing pump for separation, yielding underflow and overflow products. The column section of the fine-particle heavy media hydrocyclone 10 is lengthened by 200mm-500mm, and the cone angle is 40°-150°. The separated products are then passed through the coarse-particle concentrate fixed screen 5, the coarse-particle tailings fixed screen 7, and the fine-particle concentrate fixed screen 8. The tailings undergo a first-stage desliming process using fixed screen 11 and fine-grained tailings fixed screen 13, followed by a second-stage desliming process using coarse-grained concentrate desliming screen 6, coarse-grained tailings desliming screen 8, fine-grained concentrate desliming screen 12, and fine-grained tailings desliming screen 14. After washing with water to remove heavy media, coarse-grained concentrate, coarse-grained tailings, fine-grained concentrate, and fine-grained tailings are obtained. The tailings can be directly used for backfilling or sold, while the coarse-grained concentrate and fine-grained concentrate proceed to subsequent flotation processes.
[0043] The dilute medium underflow from the desliming screen flows by gravity to the dilute medium tank 15, where it is pumped to the magnetic separator 16 for medium recovery. The concentrate from the magnetic separator 16 returns to the qualified medium tank. The tailings water is pumped into the tailings water thickener hydrocyclone 17 via the tailings water slurry pump. The overflow product from the tailings water thickener hydrocyclone 17 is fed as spray water into the double-layer linear vibrating classifier 1. The underflow tailings water from the tailings water thickener hydrocyclone 17 enters the thickener 20. The overflow fineness of the thickener 20 is 150 ppm, and the underflow density is ≥25%.
[0044] Fine particles from the grading screen enter the ore powder water treatment system. They are then pumped by the fine particle slurry pump to the fine particle thickener 19 for concentration. The overflow product is processed by the thickener 20, and the overflow product of the thickener 20 is used as system return water. The underflow product of the thickener 20 is mixed with the product from the ore powder thickener 29 and fed into the ball mill 21. The overflow fineness of the thickener 29 is ≥95% (-200 mesh), and the underflow density of the thickener 29 is ≥50%. The overflow fineness of the thickener 29 is 150ppm, and the underflow density of the thickener is ≥25%. After ball milling, the finely ground material is adjusted to a slurry concentration of 34%-36% and fed into the flotation mixing tank 22. Modifiers, collectors, and frothers are added in sequence. After thorough mixing, the material is fed into the flotation process. After one roughing, six cleaning, and two scavenging flotation processes, the final Pb concentrate, Zn concentrate, and flotation tailings are obtained.
[0045] In the above steps, the upper screen aperture size of the double-layer linear vibrating classifier 1 is 5-20mm, and the lower screen aperture size is 0.35-1mm. The pressure of the coarse particle mixing pump is 0.1Mpa-0.25Mpa, the pressure of the fine particle mixing pump is 0.15Mpa-0.25Mpa, the pressure of the dilute medium pump is 0.06Mpa-0.1Mpa, the pressure of the fine particle slurry pump is 0.15-0.25Mpa, and the pressure of the magnetic tailings slurry pump is 0.1-0.25Mpa.
[0046] Example 1
[0047] A lead-zinc mine in Shaanxi Province has a raw ore Pb grade of 0.29% and a Zn grade of 4.91%. A combined heavy media classification and flotation system is used to classify the lead-zinc ore. The specific steps are as follows: First, the crushed raw ore is screened using a double-layer classification screen. The resulting products are coarse-grained products (10-18mm), fine-grained products (0.5-10mm), and powder products (-0.5mm). The coarse-grained products enter the coarse-grained heavy media separation system, the fine-grained products enter the fine-grained heavy media separation system, and the powder products enter the powder water treatment system.
[0048] In the coarse-grained heavy medium mixing tank 3 and the fine-grained heavy medium mixing tank 9, the heavy medium is ferrosilicon powder. The ferrosilicon powder has a magnetic content of ≥95% and a fineness of -325 mesh ≥90%. It is mixed with water to form a heavy medium suspension with a density of 2.30 g / m3. After being mixed evenly with the coarse-grained product and the fine-grained product, it is sent to the coarse-grained heavy medium hydrocyclone 4 and the fine-grained heavy medium hydrocyclone 10 respectively through the coarse-grained mixing pump and the fine-grained mixing pump for separation to obtain the underflow product and the overflow product. After separation, the product undergoes a first-stage desliming process via coarse-grained concentrate fixed screen 5, coarse-grained tailings fixed screen 7, fine-grained concentrate fixed screen 11, and fine-grained tailings fixed screen 13. It then enters a second-stage desliming process via coarse-grained concentrate desliming screen 6, coarse-grained tailings desliming screen 8, fine-grained concentrate desliming screen 12, and fine-grained tailings desliming screen 14. After water washing to remove the heavy media, coarse-grained concentrate, coarse-grained tailings, fine-grained concentrate, and fine-grained tailings are obtained. The tailings have a Pb grade of 0.1% and a Zn grade of 0.30%. The tailings can be directly used for backfilling or sold. The gravity concentrate has a Pb grade of 0.61% and a Zn grade of 7.41%. The coarse-grained concentrate and fine-grained concentrate proceed to the subsequent flotation process.
[0049] The dilute medium under the screen of the desliming screen flows by gravity to the dilute medium tank 15, and is then pumped by the dilute medium pump to the magnetic separator 16 for medium recovery. The concentrate from the magnetic separator 16 returns to the qualified medium tank. The tailings water enters the tailings water thickener hydrocyclone 17 via the tailings water slurry pump. The overflow product of the tailings water thickener hydrocyclone 17 is fed into the double-layer linear vibrating classifier 1 as spray water. The tailings water underflow from the tailings water thickener hydrocyclone 17 enters the thickener 20.
[0050] Fine particles of -0.5mm passing through the grading screen enter the ore powder water treatment system. They are then pumped by the fine particle slurry pump to the fine particle thickener hydrocyclone 19 for concentration. The overflow product is processed by the thickener 20. The overflow product of the thickener 20 is used as system return water. The underflow product of the thickener 20 is mixed with the product from the ore powder thickener hydrocyclone and then fed into the ball mill 21, where it is ground to -200 mesh (70%).
[0051] The ground material was adjusted to a pulp concentration of about 35% and fed into the flotation mixing tank 22. Modifier, collector, and frother were added in sequence and stirred thoroughly before being fed into the flotation process. After one roughing, six cleaning, and two scavenging processes, the final Pb concentrate, Zn concentrate, and flotation tailings were obtained. The Pb concentrate grade was 61.98%, the Zn concentrate grade was 48.89%, the Pb grade of the flotation tailings was 0.1%, and the Zn grade of the flotation tailings was 0.27%.
[0052] The pressure of the coarse-grained mixing pump is 0.25 MPa, the pressure of the fine-grained mixing pump is 0.25 MPa, the pressure of the dilute medium pump is 0.1 MPa, the pressure of the fine-grained slurry pump is 0.25 MPa, and the pressure of the magnetic tailwater slurry pump is 0.25 MPa.
[0053] Table 1 below compares the performance indicators of three different sorting processes:
[0054]
[0055] The above results show that:
[0056] Compared to a single flotation process, this invention can remove tailings with a comprehensive yield of 34.8%, and the comprehensive Pb recovery rate is 22.95% higher and the comprehensive Zn recovery rate is 2.63% higher. Compared to the original traditional heavy media flotation process, this invention removes an additional 4.70% of tailings, and the comprehensive Pb recovery rate is 1.51% higher than that of the traditional heavy media separation process, while the comprehensive Zn recovery rate is 10% higher, resulting in significant economic benefits.
[0057] Example 2
[0058] A lead-zinc mine in Yunnan Province has a raw ore Pb grade of 6.11% and a Zn grade of 17.59%. A combined heavy media classification and flotation system is used to classify the lead-zinc ore. The specific steps are as follows: First, the crushed raw ore is screened using a double-layer classification screen. The resulting products are coarse-grained products (8-15mm), fine-grained products (0.5-8mm), and powder products (-0.5mm). The coarse-grained products enter the coarse-grained heavy media separation system, the fine-grained products enter the fine-grained heavy media separation system, and the powder products enter the powder water treatment system.
[0059] In the coarse-grained heavy medium mixing tank 3 and the fine-grained heavy medium mixing tank 9, the heavy medium is ferrosilicon powder. This ferrosilicon powder has a magnetic content ≥95% and a fineness of -325 mesh ≥90%. It is mixed with water to form a heavy medium suspension with a density of 2.38 g / m³. After being uniformly mixed with the coarse-grained and fine-grained products, the mixture is fed into the coarse-grained heavy medium hydrocyclone 4 and the fine-grained heavy medium hydrocyclone 10 respectively via coarse-grained mixing pump and fine-grained mixing pump for separation, yielding underflow and overflow products. The separated products undergo a first-stage desliming process through the coarse-grained concentrate fixed screen 5, coarse-grained tailings fixed screen 7, fine-grained concentrate fixed screen 11, and fine-grained tailings fixed screen 13, before entering the coarse-grained concentrate desliming screen 6. The tailings desliming screen 8, fine-grained concentrate desliming screen 12, and fine-grained tailings desliming screen 14 undergo a two-stage desliming process. After washing with water, the heavy media are removed, yielding coarse-grained concentrate, coarse-grained tailings, fine-grained concentrate, and fine-grained tailings. The tailings have a Pb grade of 0.17% and a Zn grade of 0.40%. The tailings can be directly used for backfilling or sold. The gravity separation concentrate has a Pb grade of 8.81% and a Zn grade of 25.78%. The coarse-grained concentrate and fine-grained concentrate are then used in subsequent flotation processes.
[0060] The dilute medium under the screen of the desliming screen flows by gravity to the dilute medium tank 15, and is then pumped by the dilute medium pump to the magnetic separator 16 for medium recovery. The concentrate from the magnetic separator 16 returns to the qualified medium tank. The tailings water enters the tailings water thickener hydrocyclone 17 via the tailings water slurry pump. The overflow product of the tailings water thickener hydrocyclone 17 is fed into the double-layer linear vibrating classifier 1 as spray water. The tailings water underflow from the tailings water thickener hydrocyclone 17 enters the thickener 20.
[0061] Fine particles under -0.5mm from the grading screen enter the ore powder water treatment system. They are then pumped by the fine particle slurry pump to the fine particle thickener hydrocyclone 19 for concentration. The overflow product is processed by the thickener 20. The overflow product of the thickener 20 is used as system return water. The underflow product of the thickener 20 is mixed with the product from the ore powder thickener hydrocyclone and then fed into the ball mill 21, where it is ground to -200 mesh (75%).
[0062] The ground material was adjusted to a pulp concentration of about 35% and fed into the flotation mixing tank 22. Modifier, collector, and frother were added in sequence and stirred thoroughly before being fed into the flotation process. After one roughing, six cleaning, and two scavenging processes, the final Pb concentrate, Zn concentrate, and flotation tailings were obtained. The Pb concentrate grade was 56.98%, the Zn concentrate grade was 50.20%, the Pb grade of the flotation tailings was 0.17%, and the Zn grade of the flotation tailings was 0.18%.
[0063] The pressure of the coarse-grained mixing pump mentioned in the above steps is 0.1 MPa, the pressure of the fine-grained mixing pump is 0.15 MPa, the pressure of the dilute medium pump is 0.06 MPa, the pressure of the fine-grained slurry pump is 0.15 MPa, and the pressure of the magnetic tailwater slurry pump is 0.1 MPa.
[0064] Table 2 below compares the performance indicators of three different sorting processes:
[0065]
[0066] The above results show that:
[0067] Compared to a single flotation process, this invention can remove tailings with a comprehensive yield of 25.78%, and the comprehensive Pb recovery rate is 1.12% higher and the comprehensive Zn recovery rate is 0.38% higher. Compared to the original traditional heavy media flotation process, this invention removes an additional 0.09% of tailings, and the comprehensive Pb recovery rate is 0.50% higher than the ore feed yield of the traditional heavy media separation process, while the comprehensive Zn recovery rate is 0.17% higher, resulting in significant economic benefits.
[0068] Example 3
[0069] A lead-zinc mine in Guangxi has a raw ore Pb grade of 0.77% and a Zn grade of 2.89%. A combined heavy media classification and flotation process is used to separate the lead-zinc ore. The specific steps are as follows: First, the crushed raw ore is screened using a double-layer classifying screen. The resulting products are coarse particles (10-20mm), fine particles (0.5-10mm), and fine powder (-0.5mm). The coarse particles enter the coarse-particle heavy media separation system, the fine particles enter the fine-particle heavy media separation system, and the fine powder enters the fine powder water treatment system.
[0070] In the coarse-grained heavy media mixing tank 3 and the fine-grained heavy media mixing tank 9, the heavy media is made of ferrosilicon powder. This ferrosilicon powder has a magnetic content ≥95% and a fineness of -325 mesh ≥90%. It is mixed with water to form a heavy media suspension with a density of 2.02 g / m³. After being uniformly mixed with the coarse-grained and fine-grained products, the mixture is fed into the coarse-grained heavy media hydrocyclone 4 and the fine-grained heavy media hydrocyclone 10, respectively, for separation, yielding underflow and overflow products. The separated products undergo a first-stage desliming process through the coarse-grained concentrate fixed screen 5, the coarse-grained tailings fixed screen 7, the fine-grained concentrate fixed screen 11, and the fine-grained tailings fixed screen 13, before entering the coarse-grained concentrate desliming screen 6. The coarse-grained tailings desliming screen 8, the fine-grained concentrate desliming screen 12, and the fine-grained tailings desliming screen 14 undergo a two-stage desliming process. After washing with water, the heavy media are removed, yielding coarse-grained concentrate, coarse-grained tailings, fine-grained concentrate, and fine-grained tailings. The tailings have a Pb grade of 0.14% and a Zn grade of 0.19%. The tailings can be directly used for backfilling or sold. The gravity separation concentrate has a Pb grade of 1.7% and a Zn grade of 5.2%. The coarse-grained concentrate and the fine-grained concentrate are then fed into the subsequent flotation process.
[0071] The dilute medium under the screen of the desliming screen flows by gravity to the dilute medium tank 15, and is then pumped by the dilute medium pump to the magnetic separator 16 for medium recovery. The concentrate from the magnetic separator 16 returns to the qualified medium tank. The tailings water enters the tailings water thickener hydrocyclone 17 via the tailings water slurry pump. The overflow product of the tailings water thickener hydrocyclone 17 is fed into the double-layer linear vibrating classifier 1 as spray water. The tailings water underflow from the tailings water thickener hydrocyclone 17 enters the thickener 20.
[0072] Fine particles under -0.5mm from the grading screen enter the ore powder water treatment system. They are then pumped by the fine particle slurry pump to the fine particle thickener hydrocyclone 19 for concentration. The overflow product is processed by the thickener 20. The overflow product of the thickener 20 is used as system return water. The underflow product of the thickener 20 is mixed with the product from the ore powder thickener hydrocyclone and then fed into the ball mill 21, where it is ground to -200 mesh (75%).
[0073] The ground material was adjusted to a pulp concentration of about 35% and fed into the flotation mixing tank 22. Modifier, collector, and frother were added in sequence and stirred thoroughly before being fed into the flotation process. After one roughing, six cleaning, and two scavenging processes, the final Pb concentrate, Zn concentrate, and flotation tailings were obtained. The Pb concentrate grade was 57.88%, the Zn concentrate grade was 49.68%, the Pb grade of the flotation tailings was 0.14%, and the Zn grade of the flotation tailings was 0.17%.
[0074] The pressure of the coarse-grained mixing pump mentioned in the above steps is 0.2 MPa, the pressure of the fine-grained mixing pump is 0.2 MPa, the pressure of the dilute medium pump is 0.08 MPa, the pressure of the fine-grained slurry pump is 0.21 MPa, and the pressure of the magnetic tailwater slurry pump is 0.18 MPa.
[0075] Table 3 below compares the performance indicators of three different sorting processes:
[0076]
[0077] The above results show that:
[0078] Compared to a single flotation process, this invention can remove tailings with a comprehensive yield of 39.89%, and the comprehensive Pb recovery rate is 12.15% higher and the comprehensive Zn recovery rate is 3.01% higher. Compared to the original traditional heavy media flotation process, this invention removes an additional 4.09% of tailings, and the comprehensive Pb recovery rate is 0.55% higher than the ore feed yield of the traditional heavy media separation process, while the comprehensive Zn recovery rate is 0.6% higher, resulting in significant economic benefits.
[0079] Example 4
[0080] A lead-zinc mine in Jiangxi Province has a raw ore Pb grade of 1.10% and a Zn grade of 2.79%. A combined heavy media classification and flotation system is used to classify the lead-zinc ore. The specific steps are as follows: First, the crushed raw ore is screened using a double-layer classification screen. The resulting products are coarse-grained products (12-20mm), fine-grained products (0.5-12mm), and powder products (-0.5mm). The coarse-grained products enter the coarse-grained heavy media separation system, the fine-grained products enter the fine-grained heavy media separation system, and the powder products enter the powder water treatment system.
[0081] In the coarse-grained heavy medium mixing tank 3 and the fine-grained heavy medium mixing tank 9, the heavy medium is ferrosilicon powder. The ferrosilicon powder has a magnetic content ≥95% and a fineness of -325 mesh ≥90%. It is mixed with water to form a heavy medium suspension with a density of 2.08 g / m3. After being mixed evenly with the coarse-grained product and the fine-grained product, it is sent to the coarse-grained heavy medium hydrocyclone 4 and the fine-grained heavy medium hydrocyclone 10 respectively by the coarse-grained mixing pump and the fine-grained mixing pump for separation, to obtain the underflow product and the overflow product. The separated products are subjected to a first-stage desliming process through the coarse-grained concentrate fixed screen 5, the coarse-grained tailings fixed screen 7, the fine-grained concentrate fixed screen 11, and the fine-grained tailings fixed screen 13, and then enter the coarse-grained concentrate desliming screen 6 (6) and the coarse-grained concentrate desliming screen 9. Tailings desliming screen 8 (8), fine-grained concentrate desliming screen 12 (12), and fine-grained tailings desliming screen 14 undergo a two-stage desliming process. After washing with water, the heavy medium is removed to obtain coarse-grained concentrate, coarse-grained tailings, fine-grained concentrate, and fine-grained tailings. The tailings have a Pb grade of 0.1% and a Zn grade of 0.11%. The tailings can be directly used for backfilling or sold. The gravity separation concentrate has a Pb grade of 1.95% and a Zn grade of 2.98%. The coarse-grained concentrate and the fine-grained concentrate enter the subsequent flotation process.
[0082] The dilute medium under the screen of the desliming screen flows by gravity to the dilute medium tank 15, and is then pumped by the dilute medium pump to the magnetic separator 16 for medium recovery. The concentrate from the magnetic separator 16 returns to the qualified medium tank. The tailings water enters the tailings water thickener hydrocyclone 17 via the tailings water slurry pump. The overflow product of the tailings water thickener hydrocyclone 17 is fed into the double-layer linear vibrating classifier 1 as spray water. The tailings water underflow from the tailings water thickener hydrocyclone 17 enters the thickener 20.
[0083] Fine particles under -0.5mm from the grading screen enter the ore powder water treatment system. They are then pumped by the fine particle slurry pump to the fine particle thickener hydrocyclone 19 for concentration. The overflow product is processed by the thickener 20. The overflow product of the thickener 20 is used as system return water. The underflow product of the thickener 20 is mixed with the product from the ore powder thickener hydrocyclone and then fed into the ball mill 21, where it is ground to -200 mesh (75%).
[0084] The ground material was adjusted to a pulp concentration of about 35% and fed into the flotation mixing tank 22. Modifier, collector, and frother were added in sequence and stirred thoroughly before being fed into the flotation process. After one roughing, six cleaning, and two scavenging processes, the final Pb concentrate, Zn concentrate, and flotation tailings were obtained. The Pb concentrate grade was 58.95%, the Zn concentrate grade was 49.96%, the Pb grade of the flotation tailings was 0.1%, and the Zn grade of the flotation tailings was 0.1%.
[0085] The pressure of the coarse-grained mixing pump mentioned in the above steps is 0.25 MPa, the pressure of the fine-grained mixing pump is 0.15 MPa, the pressure of the dilute medium pump is 0.07 MPa, the pressure of the fine-grained slurry pump is 0.23 MPa, and the pressure of the magnetic tailwater slurry pump is 0.16 MPa.
[0086] Table 4 below compares the performance indicators of three different sorting processes:
[0087]
[0088] The above results show that:
[0089] Compared to a single flotation process, this invention can remove tailings with a comprehensive yield of 44.53%, and the comprehensive Pb recovery rate is 5.35% higher and the comprehensive Zn recovery rate is 1.38% higher. Compared to the original traditional heavy media flotation process, this invention removes an additional 4.48% of tailings, and the comprehensive Pb recovery rate is 0.44% higher than the traditional heavy media separation process, while the comprehensive Zn recovery rate is 0.27% higher, resulting in significant economic benefits.
[0090] Therefore, it can be seen from the data of the above embodiments 1, 2, 3 and 4 that the sorting system and sorting process of this application have lower tailings grade and higher concentrate grade, and better sorting effect. It can relatively increase the tailings waste production rate, further reduce the amount of ore entering the mill, reduce production costs for enterprises, and improve resource recovery rate.
[0091] The specific embodiments of this application have been described in detail above. For those skilled in the art, several improvements and modifications can be made to this application without departing from the principle of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.
Claims
1. A combined dense medium separation-gravity separation-flotation system for the beneficiation of lead-zinc ores, characterized in that The system comprises a heavy medium separation system and a flotation system, the heavy medium separation system comprises a crushing and screening unit, a heavy medium coarse particle separation unit, a heavy medium fine particle separation unit and a fine ore water treatment unit, the outlet of the crushing and screening unit is divided into a coarse particle outlet, a fine particle outlet and a fine ore outlet, the coarse particle outlet is connected with the heavy medium coarse particle separation unit, the fine particle outlet is connected with the heavy medium fine particle separation unit, the fine ore outlet is connected with the fine ore water treatment unit, the coarse particle heavy separation tailings outlet of the heavy medium coarse particle separation unit obtains coarse particle heavy separation tailings, the fine particle heavy separation tailings outlet of the heavy medium fine particle separation unit obtains fine particle heavy separation tailings, the coarse particle heavy separation concentrate outlet of the heavy medium coarse particle separation unit, the fine particle heavy separation concentrate outlet of the heavy medium fine particle separation unit and the concentrated fine ore outlet of the fine ore water treatment unit are connected with the flotation system respectively, and the flotation system obtains flotation Pb concentrate, flotation Zn concentrate and flotation tailings.
2. A combined dense medium separation and flotation system for the beneficiation of lead-zinc ores according to claim 1, characterised in that The crushing and screening unit comprises a crushing device, a feeding chute, a double-layer linear vibration grading screen, an a-b coarse particle outlet chute, a b-c fine particle outlet chute and a -c fine ore under-screen chute, the outlet of the crushing device is connected with the inlet of the feeding chute, the outlet of the feeding chute is connected with the inlet of the double-layer linear vibration grading screen, the a-b coarse particle screen upper outlet of the double-layer linear vibration grading screen is connected with the inlet of the a-b coarse particle outlet chute, the outlet of the a-b coarse particle outlet chute is connected with the inlet of the heavy medium coarse particle separation unit, the b-c fine particle screen upper outlet of the double-layer linear vibration grading screen is connected with the inlet of the b-c fine particle outlet chute, the outlet of the b-c fine particle outlet chute is connected with the inlet of the heavy medium fine particle separation unit, the under-screen outlet of the double-layer linear vibration grading screen is connected with the inlet of the -c fine ore under-screen chute, and the outlet of the -c fine ore under-screen chute is connected with the fine ore water treatment unit.
3. The combined dense medium separation and flotation system for the beneficiation of lead-zinc ores according to claim 1, characterized in that The heavy medium coarse particle separation unit comprises a coarse particle heavy medium mixing barrel, a coarse particle heavy medium cyclone, a coarse particle concentrate fixed screen, a coarse particle concentrate de-media screen, a coarse particle tailings fixed screen and a coarse particle tailings de-media screen, the inlet of the coarse particle heavy medium mixing barrel is connected with the coarse particle outlet of the crushing and screening unit outlet, the outlet of the coarse particle heavy medium mixing barrel is connected with the coarse particle heavy medium cyclone through a coarse particle mixing pump, the underflow outlet and the overflow outlet of the coarse particle heavy medium cyclone are connected with the inlet of the coarse particle concentrate fixed screen and the inlet of the coarse particle tailings fixed screen respectively, the under-screen products of the coarse particle concentrate fixed screen and the coarse particle tailings fixed screen are connected with the coarse particle heavy medium mixing barrel respectively, the on-screen products of the coarse particle concentrate fixed screen and the coarse particle tailings fixed screen are connected with the inlet of the coarse particle concentrate de-media screen and the inlet of the coarse particle tailings de-media screen respectively, the on-screen product outlet of the coarse particle concentrate de-media screen is directly connected with the flotation system as coarse particle concentrate, and the on-screen material of the coarse particle tailings de-media screen is coarse particle heavy separation tailings for sale or stockpiling.
4. The combined dense medium separation and flotation system for the beneficiation of lead-zinc ores according to claim 1, characterized in that The heavy media fine-particle separation unit includes a fine-particle heavy media mixing tank, a fine-particle heavy media hydrocyclone, a fine-particle concentrate fixed screen, a fine-particle concentrate desliming screen, a fine-particle tailings fixed screen, and a fine-particle tailings desliming screen. The inlet of the fine-particle heavy media mixing tank is connected to the fine-particle outlet of the crushing and screening unit. The outlet of the fine-particle heavy media mixing tank is connected to the fine-particle heavy media hydrocyclone via a fine-particle mixing pump. The underflow outlet and overflow outlet of the fine-particle heavy media hydrocyclone are respectively connected to the fine-particle concentrate fixed screen. The inlet of the fixed screen for fine-grained tailings is connected to the inlet of the fixed screen for fine-grained concentrate and the fixed screen for fine-grained tailings. The undersize products of the fixed screen for fine-grained concentrate and the fixed screen for fine-grained tailings are respectively connected to the inlet of the fixed screen for fine-grained concentrate and the inlet of the fixed screen for fine-grained tailings. The outlet of the undersize product of the fine-grained concentrate desliming screen is used as fine-grained concentrate and directly enters the flotation system. The oversize material of the fine-grained tailings desliming screen is used as fine-grained gravity separation tailings and is sold or stored.
5. The combined dense medium separation and flotation system for the beneficiation of lead-zinc ores according to claim 1, characterized in that Both the coarse-grained heavy media separation unit and the fine-grained heavy media separation unit are equipped with qualified media distributors. The inlets of the qualified media distributors are connected to the under-screen outlets of the coarse-grained concentrate fixed screen, the coarse-grained tailings fixed screen, the fine-grained concentrate fixed screen, and the fine-grained tailings fixed screen, respectively. The outlets of the qualified media distributors are connected to the inlets of the coarse-grained heavy media mixing tank and the fine-grained heavy media mixing tank, respectively.
6. The combined dense medium separation and flotation system for the beneficiation of lead-zinc ores according to claim 1, characterized in that Both the heavy medium coarse-particle separation unit and the heavy medium fine-particle separation unit are equipped with a dilute medium tank, a magnetic separator, and a magnetic tailings water thickener. The inlet of the dilute medium tank is connected to the undersize product outlet of the coarse-particle concentrate desliming screen, the coarse-particle tailings desliming screen, the fine-particle concentrate desliming screen, and the fine-particle tailings desliming screen, respectively. The outlet of the dilute medium tank is connected to the inlet of the magnetic separator via a dilute medium pump. The magnetic product outlet of the magnetic separator is connected to the inlet of the qualified medium distributor via a pipeline. The non-magnetic product outlet of the magnetic separator is connected to the inlet of the magnetic tailings water thickener via a magnetic tailings water slurry pump. The overflow outlet of the magnetic tailings water thickener is connected to the spray water of the double-layer linear vibrating classifying screen. The underflow outlet of the magnetic tailings water thickener is connected to the fine ore water treatment unit.
7. The combined dense medium separation and flotation system for the beneficiation of lead-zinc ores according to claim 1, characterized in that The powder ore water treatment unit includes a fine-particle feed box, a fine-particle thickening hydrocyclone, and a thickener. The inlet of the fine-particle feed box is connected to the powder ore outlet of the double-layer linear vibrating classifier. The outlet of the fine-particle feed box is connected to the fine-particle thickening hydrocyclone via a fine-particle slurry pump. The overflow outlet of the fine-particle thickening hydrocyclone is connected to the inlet of the thickener. The underflow outlet of the fine-particle thickening hydrocyclone is connected to the flotation system.
8. The combined dense medium separation and flotation system for the beneficiation of lead-zinc ores according to claim 1, characterized in that The flotation system comprises a ball mill, a flotation stirring barrel, a rough flotation machine group, a Pb flotation machine group, a Zn flotation machine group and a tailing flotation machine group, the inlet of the ball mill is connected with the on-screen product outlet of the coarse-grained concentrate medium draining screen, the on-screen product outlet of the fine-grained concentrate medium draining screen and the underflow outlet of the fine-grained concentration cyclone respectively, the outlet of the ball mill is connected with the inlet of the flotation stirring barrel, the outlet of the flotation stirring barrel is connected with the rough flotation machine group, the A foam product outlet of the rough flotation machine group is connected with the Pb flotation machine group, the B foam product outlet of the rough flotation machine group is connected with the Zn flotation machine group, and the in-tank product outlet of the rough flotation machine group is connected with the tailing flotation machine group.