All-particle-size heavy medium beneficiation system and beneficiation method

Abstract

The present invention relates to the technical field of heavy medium beneficiation, in particular to an all-particle-size heavy medium beneficiation system and beneficiation method. The system is characterized by comprising a grading unit, a heavy medium coarse fraction separation unit, a fine fraction desliming unit, a heavy medium fine fraction separation unit, and a fine fraction demediation / dehydration unit. The grading unit is a unit for dividing a material into a coarse fraction and a fine fraction. A coarse fraction outlet of the grading unit is connected to the heavy medium coarse fraction separation unit, and a fine fraction outlet of the grading unit is sequentially connected to the fine fraction desliming unit, the heavy medium fine fraction separation unit, and the fine fraction demediation / dehydration unit. The present invention overcomes the defects of the particle size lower limits of heavy medium separation and has advantages such as having a high selection comprehensive yield, a good separation effect, and low production costs, requiring little equipment investment, and being energy-saving and environmentally friendly.

Description

A full-size heavy medium beneficiation system and beneficiation method Technical Field

[0001] The present invention relates to the technical field of heavy medium ore dressing, in particular to a full-size heavy medium ore dressing system and a ore dressing method. Background Art

[0002] As we all know, with the continuous exploitation of mining resources, we are facing an increasingly serious problem of resource depletion. At the same time, people's awareness of environmental protection has increased, the country has strengthened its efforts in the comprehensive utilization of mineral resources year by year, and the management and approval of tailings ponds in dressing plants have become increasingly strict. Pre-selection technology is particularly important in the green and sustainable development of the mining industry. Among them, heavy medium mineral separation technology has the advantages of high sorting accuracy, large ore processing capacity, high efficiency in discarding waste rock during pre-selection, and no wastewater in the sorting process. Its application in the beneficiation of non-ferrous metal and non-metallic ores is gradually increasing.

[0003] However, traditional heavy medium beneficiation technology has always been constrained by the high lower limit of sorting particle size, low fine particle size sorting accuracy, and difficulty in removing the fine particle size from the medium and dehydrating it. The fine particle size can only be screened out in advance and not be sorted in the heavy medium sorting system. As a result, the heavy medium beneficiation full particle size process has not been perfected and the overall yield of heavy medium selection is relatively low. Summary of the Invention

[0004] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art and to provide a full-size heavy medium beneficiation system and a beneficiation method which has a simple system, realizes effective fine-size separation, has good separation effect, and has a high comprehensive yield of heavy medium selection.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A full-size heavy medium beneficiation system is characterized in that the system includes a grading unit, a heavy medium coarse-size separation unit, a fine-size desliming unit, a heavy medium fine-size separation unit, and a fine-size demediation / dehydration unit. The grading unit is a unit that divides the material into coarse and fine sizes. The coarse-size outlet of the grading unit is connected to the heavy medium coarse-size separation unit. The fine-size outlet of the grading unit is sequentially connected to the fine-size desliming unit, the heavy medium fine-size separation unit, and the fine-size demediation / dehydration unit. The grading unit divides the selected material into two size products, coarse and fine sizes. The coarse size enters the heavy medium coarse-size separation unit for sorting to obtain coarse-size concentrate and coarse-size tailings. The fine size enters the fine-size desliming unit, the heavy medium fine-size separation unit, the fine-size demediation, and the dehydration unit in sequence to obtain the final fine-size concentrate and fine-size tailings.

[0007] The grading unit described in the present invention includes a feed trough, a grading screen, a discharge trough and an under-screen chute. The outlet of the feed trough is connected to the inlet of the grading screen, the above-screen outlet of the grading screen is connected to the inlet of the discharge trough, the discharge trough is connected to the heavy medium coarse particle separation unit via the under-screen chute, the fine particle material outlet output from the under-screen outlet of the grading screen is connected to the under-screen chute, and the under-screen chute is connected to the fine particle desludging unit via a pipeline.

[0008] The heavy medium coarse particle separation unit of the present invention comprises a first heavy medium mixing barrel, a coarse particle heavy medium cyclone, a concentrate fixed screen, a concentrate de-mediation screen, a tailings fixed screen, a tailings de-mediation screen and a magnetic separator. The inlet of the first heavy medium mixing barrel is connected to the discharge trough in the classification unit, the outlet of the first heavy medium mixing barrel is connected to the inlet of the coarse particle heavy medium cyclone via a first slurry pump, the overflow outlet and the underflow outlet of the coarse particle heavy medium cyclone are connected to the tailings fixed screen and the concentrate fixed screen respectively via pipelines, and the undersize products of the concentrate fixed screen and the tailings fixed screen are respectively It is connected to the first heavy medium mixing barrel through a pipeline, the oversize product outlets of the tailings fixed screen and the concentrate fixed screen are connected to the tailings de-mediation screen and the concentrate de-mediation screen respectively, the tailings de-mediation screen 7 and the concentrate de-mediation screen undersize product outlet are connected to the magnetic separator, the magnetic product outlet of the magnetic separator is connected to the first heavy medium mixing barrel through a pipeline, the non-magnetic product outlet of the magnetic separator is transported to the return water pool through a pipeline, the oversize product outlet of the concentrate de-mediation screen is directly sold as coarse-grained concentrate or sent to grinding and flotation, and the oversize material of the tailings de-mediation screen is sold or stored as coarse-grained tailings.

[0009] The fine-particle desludging unit of the present invention includes a fine-particle feed trough, a first concentrating cyclone, and a first dewatering screen. The undersize outlet of the grading screen is connected to the fine-particle feed trough via a pipeline. The discharge port of the fine-particle feed trough is connected to the feed port end of the first concentrating cyclone via a second slurry pump. The overflow of the first concentrating cyclone is connected to the thickener via a pipeline. The underflow outlet of the first concentrating cyclone is connected to the screen distributor of the first dewatering screen. The product outlet on the first dewatering screen is connected to the heavy medium fine-particle separation unit. The undersize outlet of the first dewatering screen is connected to the fine-particle feed trough.

[0010] The heavy medium fine particle separation unit described in the present invention includes a second heavy medium mixing barrel and a fine particle heavy medium cyclone. The above-screen outlet of the first dewatering screen is connected to the second heavy medium mixing barrel via a pipeline. The discharge port of the second heavy medium mixing barrel is connected to the feed port end of the fine particle heavy medium cyclone via a third slurry pump. The overflow outlet and underflow outlet of the fine particle heavy medium cyclone are respectively connected to the fine particle demediation / dewatering unit via pipelines.

[0011] The fine-grained de-mediuming / dehydration unit of the present invention comprises a concentrate collecting tank, a tailings collecting tank, a concentrate concentrating magnetic separator, a tailings concentrating magnetic separator, a concentrate scavenging magnetic separator, a tailings scavenging magnetic separator, a second concentrating cyclone, a third concentrating cyclone, a second dewatering screen and a third dewatering screen, the overflow outlet and the underflow outlet of the fine-grained heavy medium cyclone are respectively connected to the tailings collecting tank and the concentrate collecting tank via a pipeline, the tailings collecting tank and the concentrate collecting tank are respectively connected to the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator via a fourth slurry pump and a fifth slurry pump via a pipeline, the non-magnetic product outlets of the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator are respectively connected to the tailings scavenging magnetic separator and the concentrate scavenging magnetic separator, the tailings concentrating magnetic separator, the concentrate concentrating magnetic separator, the tailings scavenging magnetic separator, the concentrate scavenging magnetic separator, the tailings concentrating ... The magnetic material outlet of the magnetic separator returns again and is connected to the second heavy medium mixing barrel; the non-magnetic outlet of the concentrate scavenging magnetic separator is respectively connected to the second concentrating cyclone, and the underflow outlet of the second concentrating cyclone is connected to the second dewatering screen. The oversize outlet product of the second dewatering screen is directly sold as a fine-grained concentrate product or sent to grinding and flotation. The overflow outlet of the second concentrating cyclone and the undersize outlet of the second dewatering screen are connected to the concentrate collection tank via a pipeline; the non-magnetic outlet of the tailings scavenging magnetic separator is respectively connected to the third concentrating cyclone, and the underflow outlet of the third concentrating cyclone is connected to the inlet of the third dewatering screen. The oversize outlet product of the third dewatering screen is directly sold or landfilled as a fine-grained tailings product. The overflow outlet of the third concentrating cyclone and the undersize outlet of the third dewatering screen are returned via a pipeline to the tailings collection tank.

[0012] A beneficiation method for a full-size heavy medium beneficiation system, characterized in that the beneficiation steps are as follows:

[0013] (1) Make a full-size heavy medium beneficiation system: The system includes a grading unit, a heavy medium coarse-size separation unit, a fine-size desliming unit, a heavy medium fine-size separation unit, and a fine-size demediation / dehydration unit. The grading unit is a unit for separating materials into coarse and fine sizes. The coarse-size outlet of the grading unit is connected to the heavy medium coarse-size separation unit. The fine-size outlet of the grading unit is sequentially connected to the fine-size desliming unit, the heavy medium fine-size separation unit, and the fine-size demediation / dehydration unit. The grading unit divides the selected materials into two size products, namely, coarse and fine sizes. The coarse size enters the heavy medium coarse-size separation unit for separation to obtain coarse-size concentrate and coarse-size tailings. The fine size enters the fine-size desliming unit, the heavy medium fine-size separation unit, the fine-size demediation unit, and the dehydration unit in sequence to obtain the final fine-size concentrate and fine-size tailings.

[0014] The grading unit includes a feed trough, a grading screen, a discharge trough and an under-screen chute. The outlet of the feed trough is connected to the inlet of the grading screen, the upper screen outlet of the grading screen is connected to the inlet of the discharge trough, the discharge trough is connected to the heavy medium coarse particle separation unit via the under-screen chute, the fine particle material outlet output from the under-screen outlet of the grading screen is connected to the under-screen chute, and the under-screen chute is connected to the fine particle desludging unit via a pipeline.

[0015] The heavy medium coarse particle separation unit includes a first heavy medium mixing barrel, a coarse particle heavy medium cyclone, a concentrate fixed screen, a concentrate de-mediation screen, a tailings fixed screen, a tailings de-mediation screen and a magnetic separator. The inlet of the first heavy medium mixing barrel is connected to the discharge trough in the classification unit. The outlet of the first heavy medium mixing barrel is connected to the inlet of the coarse particle heavy medium cyclone through a first slurry pump. The overflow outlet and the underflow outlet of the coarse particle heavy medium cyclone are respectively connected to the tailings fixed screen and the concentrate fixed screen through pipelines. The undersize products of the concentrate fixed screen and the tailings fixed screen are respectively connected to the pipelines. The sieve is connected to the first heavy medium mixing barrel, the oversize product outlets of the tailings fixed screen and the concentrate fixed screen are connected to the tailings de-mediation screen and the concentrate de-mediation screen respectively, the tailings de-mediation screen 7 and the concentrate de-mediation screen undersize product outlet are connected to the magnetic separator, the magnetic product outlet of the magnetic separator is connected to the first heavy medium mixing barrel via a pipeline, the non-magnetic product outlet of the magnetic separator is transported to the return water tank via a pipeline, the oversize product outlet of the concentrate de-mediation screen is directly sold as a coarse-grained concentrate or sent to the mill and flotation, and the oversize material of the tailings de-mediation screen is sold or stored as a coarse-grained tailings;

[0016] The fine-grained desludging unit includes a fine-grained feed trough, a first thickening cyclone, and a first dewatering screen. The undersize outlet of the grading screen is connected to the fine-grained feed trough via a pipeline. The discharge port of the fine-grained feed trough is connected to the feed port of the first thickening cyclone via a second slurry pump. The overflow of the first thickening cyclone is connected to the thickener via a pipeline. The underflow outlet of the first thickening cyclone is connected to the screen distributor of the first dewatering screen. The product outlet on the first dewatering screen is connected to the heavy medium fine-grained separation unit. The undersize outlet of the first dewatering screen is connected to the fine-grained feed trough.

[0017] The heavy medium fine particle separation unit includes a second heavy medium mixing barrel and a fine particle heavy medium cyclone. The upper screen outlet of the first dewatering screen is connected to the second heavy medium mixing barrel via a pipeline. The discharge port of the second heavy medium mixing barrel is connected to the feed port of the fine particle heavy medium cyclone via a third slurry pump. The overflow outlet and underflow outlet of the fine particle heavy medium cyclone are respectively connected to the fine particle de-medium / dewatering unit via pipelines.

[0018] The fine-grained de-mediuming / dehydration unit includes a concentrate collecting tank, a tailings collecting tank, a concentrate concentrating magnetic separator, a tailings concentrating magnetic separator, a concentrate scavenging magnetic separator, a tailings scavenging magnetic separator, a second concentrating cyclone, a third concentrating cyclone, a second dewatering screen and a third dewatering screen. The overflow outlet and the underflow outlet of the fine-grained heavy medium cyclone are respectively connected to the tailings collecting tank and the concentrate collecting tank through pipelines. The tailings collecting tank and the concentrate collecting tank are respectively connected to the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator through pipelines via the fourth slurry pump and the fifth slurry pump. The non-magnetic product outlets of the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator are respectively connected to the tailings scavenging magnetic separator and the concentrate scavenging magnetic separator. The tailings concentrating magnetic separator, the concentrate concentrating magnetic separator, the tailings scavenging magnetic separator, the concentrate scavenging magnetic separator The magnetic material outlet of the separator returns again and is connected to the second heavy medium mixing barrel; the non-magnetic outlet of the concentrate scavenging magnetic separator is respectively connected to the second concentrating cyclone, the underflow outlet of the second concentrating cyclone is connected to the second dewatering screen, the oversize outlet product of the second dewatering screen is directly sold as a fine-grained concentrate product or sent to grinding and flotation, the overflow outlet of the second concentrating cyclone and the undersize outlet of the second dewatering screen are connected to the concentrate collection tank via a pipeline; the non-magnetic outlet of the tailings scavenging magnetic separator is respectively connected to the third concentrating cyclone, the underflow outlet of the third concentrating cyclone is connected to the inlet of the third dewatering screen, the oversize outlet product of the third dewatering screen is directly sold as a fine-grained tailings product or landfilled, the overflow outlet of the third concentrating cyclone and the undersize outlet of the third dewatering screen are returned via a pipeline to the tailings collection tank;

[0019] (2) According to step (1), the system selects parameters and runs. The heavy medium in the first heavy medium mixing barrel is ferrosilicon powder, the magnetic content of the ferrosilicon powder is ≥90%, the proportion of -325 mesh fineness is 90%-97%, and the content of -400 mesh is 85%-90%. The density of the heavy medium suspension in the first heavy medium mixing barrel is 1.70-3.20g / cm³, the overflow fineness of the concentrating cyclone is -200 mesh ≥95%, and the heavy medium in the second heavy medium mixing barrel is ferrosilicon powder, the magnetic content of the ferrosilicon powder is ≥95%, and the fineness of -325 mesh is 85%-90%. The content is 80%-85%, the -400 mesh content is 60%-65%, the density of the concentrate collection tank and the tailings collection tank is controlled at 1.10-1.35g / cm3, the mesh size of the first dewatering screen is 0.15-0.30mm, the mesh size of the second dewatering screen is 0.15-0.3mm, the mesh size of the third dewatering screen is 0.15-0.3mm, the pressure of the first slurry pump is 0.1Mpa-0.25Mpa, the pressure of the third slurry pump is 0.1Mpa-0.25Mpa, the heavy medium suspension and the ore are pumped by the slurry pump at a pressure of 0.1MPa-0 .25MPa is fed into the heavy medium cyclone and separated under the action of centrifugal force. The bottom flow products of the two heavy medium cyclones are subsequently processed into heavy medium concentrate, and the overflow products are subsequently processed into waste rock. The pressure of the second slurry pump is 0.08Mpa-0.15Mpa, the pressure of the fourth slurry pump is 0.02-0.04Mpa, and the pressure of the fifth slurry pump is 0.02-0.04Mpa. After the above parameters are selected, the system is operated for separation, wherein the first slurry pump and the third slurry pump deliver The slurry delivered is a mixture of heavy medium and ore, with a large overall specific gravity, and requires sufficient power to ensure the effective separation of the target minerals; the material delivered by the second slurry pump is fine-grained material with a small overall specific gravity, and fine-grained concentration operations can be achieved within this pressure range; the fourth and fifth slurry pumps deliver dilute media, and their delivery pressures must meet the delivery capacity while ensuring that the flow rate of the dilute media delivered to the magnetic separator by the fourth and fifth slurry pumps is within the effective working range of the magnetic separator, so that the magnetic separator achieves the best operating effect.

[0020] In step (1) of the present invention, the aperture size of the grading screen is 0.35-1 mm, and the cone angle of the fine-grained heavy medium cyclone is 40°-150°.

[0021] The beneficial effects of the present invention are as follows:

[0022] (1) The heavy medium fine particle size separation system can complete the effective separation of fine particle size target minerals and gangue minerals, realize the effective separation of fine particle size materials, increase the comprehensive yield of the heavy medium system, break the disadvantage of the lower limit of heavy medium separation particle size, and has the advantages of high comprehensive yield, good separation effect, small equipment investment, low production cost, energy saving and environmental protection;

[0023] (2) The fine-grained desludging system can complete the desludging of fine-grained materials of -200 mesh, thereby reducing the mud content of the heavy medium suspension in the heavy medium fine-grained separation system, thereby improving the separation accuracy of the heavy medium fine-grained materials.

[0024] (3) The heavy medium in the second heavy medium mixing barrel is ferrosilicon powder, with a magnetic content of ≥95%, a fineness of -325 mesh content of 80%-85%, and a -400 mesh content of 60%-65%. The purpose is to optimize the coarse particle grading of the heavy medium, reduce the viscosity of the heavy medium suspension, and thus improve the sorting accuracy of the fine particle size of the heavy medium.

[0025] (4) The cone angle of the fine-grained heavy medium cyclone is a large cone angle structure of 40°-150°. Its purpose is to reduce the sorting density required for fine-grained materials and weaken the shuttle resistance of fine-grained materials during the sorting process, thereby improving the sorting accuracy of heavy medium fine-grained materials.

[0026] (5) The overflow of the second thickening cyclone and the second dewatering screen are returned to the concentrate collection tank through a pipeline, and the overflow of the third thickening cyclone and the third dewatering screen are returned to the tailings collection tank through a pipeline. The purpose is to reduce the medium density in the concentrate collection tank and the tailings collection tank to 1.10-1.35g / cm3, thereby meeting the working conditions of the magnetic separator and ensuring the medium removal efficiency of the magnetic separator.

[0027] (6) The overflow of the second thickening cyclone and the second dewatering screen are returned to the concentrate collection tank through a pipeline, and the overflow of the third thickening cyclone and the third dewatering screen are returned to the tailings collection tank through a pipeline, which can improve the dry discharge rate of fine-grained concentrate and tailings after sorting.

[0028] (7) The materials transported by the first and third slurry pumps are a mixture of heavy medium and ore, with a large overall specific gravity. Sufficient power can ensure the effective separation of the target minerals;

[0029] (8) The material transported by the second slurry pump is fine-grained material with a relatively small overall specific gravity. Within this pressure range, fine-grained concentration can be achieved;

[0030] (9) The materials transported by the fourth and fifth slurry pumps are dilute media. Their delivery pressures meet the delivery capacity while ensuring that the flow rate of the dilute media delivered by the fourth and fifth slurry pumps to the magnetic separator is within the effective working range of the magnetic separator, thereby enabling the magnetic separator to achieve the best operating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of the present invention. Implementation Method

[0032] The present invention will be further described below in conjunction with the accompanying drawings:

[0033] As shown in the accompanying drawings, a full-size heavy medium beneficiation system is characterized in that the system includes a grading unit, a heavy medium coarse-size separation unit, a fine-size desliming unit, a heavy medium fine-size separation unit, and a fine-size demediation / dehydration unit. The grading unit is a unit that divides the material into coarse and fine sizes. The coarse-size outlet of the grading unit is connected to the heavy medium coarse-size separation unit, and the fine-size outlet of the grading unit is sequentially connected to the fine-size desliming unit, the heavy medium fine-size separation unit, and the fine-size demediation / dehydration unit. The grading unit divides the selected material into two size products of coarse and fine sizes. The coarse size enters the heavy medium coarse-size separation unit for sorting to obtain coarse-size concentrate and coarse-size tailings. The fine size enters the fine-size desliming unit, the heavy medium fine-size separation unit, the fine-size demediation, and the dehydration unit in sequence to obtain the final fine-size concentrate and fine-size tailings.

[0034] Furthermore, the grading unit includes a feed trough, a grading screen 1, a discharge trough and an under-screen chute, the outlet of the feed trough is connected to the inlet of the grading screen 1, the above-screen outlet of the grading screen 1 is connected to the inlet of the discharge trough, the discharge trough is connected to the heavy medium coarse particle separation unit via the under-screen chute, the fine particle material outlet output from the under-screen outlet of the grading screen 1 is connected to the under-screen chute, and the under-screen chute is connected to the fine particle desludging unit via a pipeline.

[0035] Furthermore, the heavy medium coarse particle separation unit includes a first heavy medium mixing barrel 2, a coarse particle heavy medium cyclone 3, a concentrate fixed screen 4, a concentrate de-mediation screen 5, a tailings fixed screen 6, a tailings de-mediation screen 7 and a magnetic separator 8. The inlet of the first heavy medium mixing barrel 2 is connected to the discharge trough in the classification unit, and the outlet of the first heavy medium mixing barrel 2 is connected to the inlet of the coarse particle heavy medium cyclone 3 through a first slurry pump. The overflow outlet and the underflow outlet of the coarse particle heavy medium cyclone 3 are respectively connected to the tailings fixed screen 6 and the concentrate fixed screen 4 through pipelines. The undersize products of the concentrate fixed screen 4 and the tailings fixed screen 6 are separated. The tailings de-mediation screen 7 and the concentrate de-mediation screen 5 are connected to the first heavy medium mixing barrel 2 through a pipeline. The oversize product outlets of the tailings fixed screen 6 and the concentrate fixed screen 4 are connected to the tailings de-mediation screen 7 and the concentrate de-mediation screen 5 respectively. The undersize product outlets of the tailings de-mediation screen 77 and the concentrate de-mediation screen 5 are connected to the magnetic separator 8. The magnetic product outlet of the magnetic separator 8 is connected to the first heavy medium mixing barrel 2 through a pipeline. The non-magnetic product outlet of the magnetic separator 8 is transported to the return water pool through a pipeline. The oversize product outlet of the concentrate de-mediation screen 5 is directly sold as a coarse-grained concentrate or sent to the mill and flotation. The oversize material of the tailings de-mediation screen 7 is sold or stored as a coarse-grained tailings.

[0036] Furthermore, the fine-particle desludging unit includes a fine-particle feed trough 9, a first thickening cyclone 10, and a first dewatering screen 11. The underscreen outlet of the grading screen 1 is connected to the fine-particle feed trough 9 via a pipeline, the discharge port of the fine-particle feed trough 9 is connected to the feed port end of the first thickening cyclone 10 via a second slurry pump, the overflow of the first thickening cyclone 10 is connected to the thickener via a pipeline, the bottom flow outlet of the first thickening cyclone 10 is connected to the screen distributor of the first dewatering screen 11, the screen product outlet of the first dewatering screen 11 is connected to the heavy medium fine-particle separation unit, and the underscreen outlet of the first dewatering screen 11 is connected to the fine-particle feed trough 9.

[0037] Furthermore, the heavy medium fine particle separation unit includes a second heavy medium mixing barrel 12 and a fine particle heavy medium cyclone 13. The above-screen outlet of the first dewatering screen 11 is connected to the second heavy medium mixing barrel 12 via a pipeline. The discharge port of the second heavy medium mixing barrel 12 is connected to the feed port end of the fine particle heavy medium cyclone 13 via a third slurry pump. The overflow outlet and the underflow outlet of the fine particle heavy medium cyclone 13 are respectively connected to the fine particle demediation / dewatering unit via pipelines.

[0038] Furthermore, the fine-grained de-mediuming / dehydration unit includes a concentrate collecting tank 14, a tailings collecting tank 15, a concentrate concentrating magnetic separator 15, a tailings concentrating magnetic separator 20, a concentrate scavenging magnetic separator 16, a tailings scavenging magnetic separator 21, a second thickening cyclone 17, a third thickening cyclone 22, a second dehydration screen 18 and a third dehydration screen 23. The overflow outlet and the underflow outlet of the fine-grained heavy medium cyclone 13 are respectively connected to the tailings collecting tank 15 and the concentrate cyclone 17 through pipelines. The tailings collecting tank 15 and the concentrate collecting tank 14 are connected to the tailings concentrating magnetic separator 20 and the concentrate concentrating magnetic separator 15 respectively through the fourth slurry pump and the fifth slurry pump through the pipeline, and the non-magnetic product outlets of the tailings concentrating magnetic separator 20 and the concentrate concentrating magnetic separator 15 are respectively connected to the tailings scavenging magnetic separator 21 and the concentrate scavenging magnetic separator 16. The magnetic outlet of the concentrate sweeping magnetic separator 8 is returned to the second heavy medium mixing barrel 12 again; the non-magnetic outlet of the concentrate sweeping magnetic separator 16 is respectively connected to the second concentrating cyclone 17, and the underflow outlet of the second concentrating cyclone 17 is connected to the second dewatering screen 18. The oversize outlet product of the second dewatering screen 18 is directly sold as a fine-grained concentrate product or sent to grinding and flotation. The overflow outlet of the second concentrating cyclone 17 and the undersize outlet of the second dewatering screen 18 are connected to the concentrate collecting tank 14 through a pipeline; the non-magnetic outlet of the tailings sweeping magnetic separator 21 is respectively connected to the third concentrating cyclone 22, and the underflow outlet of the third concentrating cyclone 22 is connected to the inlet of the third dewatering screen 23. The oversize outlet product of the third dewatering screen 23 is directly sold or landfilled as a fine-grained tailings product. The overflow outlet of the third concentrating cyclone 22 and the undersize outlet of the third dewatering screen 23 are returned to the tailings collecting tank 15 through a pipeline.

[0039] The mineral processing steps are as follows:

[0040] (1) Make a full-size heavy medium beneficiation system: The system includes a grading unit, a heavy medium coarse-size separation unit, a fine-size desliming unit, a heavy medium fine-size separation unit, and a fine-size demediation / dehydration unit. The grading unit is a unit for separating materials into coarse and fine sizes. The coarse-size outlet of the grading unit is connected to the heavy medium coarse-size separation unit. The fine-size outlet of the grading unit is sequentially connected to the fine-size desliming unit, the heavy medium fine-size separation unit, and the fine-size demediation / dehydration unit. The grading unit divides the selected materials into two size products, namely, coarse and fine sizes. The coarse size enters the heavy medium coarse-size separation unit for separation to obtain coarse-size concentrate and coarse-size tailings. The fine size enters the fine-size desliming unit, the heavy medium fine-size separation unit, the fine-size demediation unit, and the dehydration unit in sequence to obtain the final fine-size concentrate and fine-size tailings.

[0041] The grading unit includes a feed trough, a grading screen 1, a discharge trough and an under-screen chute. The outlet of the feed trough is connected to the inlet of the grading screen 1, the upper screen outlet of the grading screen 1 is connected to the inlet of the discharge trough, the discharge trough is connected to the heavy medium coarse particle separation unit via the under-screen chute, the fine particle material outlet output from the under-screen outlet of the grading screen 1 is connected to the under-screen chute, and the under-screen chute is connected to the fine particle desludging unit via a pipeline.

[0042] The heavy medium coarse particle separation unit includes a first heavy medium mixing barrel 2, a coarse particle heavy medium cyclone 3, a concentrate fixed screen 4, a concentrate de-mediation screen 5, a tailings fixed screen 6, a tailings de-mediation screen 7 and a magnetic separator 8. The inlet of the first heavy medium mixing barrel 2 is connected to the discharge trough in the classification unit, and the outlet of the first heavy medium mixing barrel 2 is connected to the inlet of the coarse particle heavy medium cyclone 3 through a first slurry pump. The overflow outlet and the underflow outlet of the coarse particle heavy medium cyclone 3 are respectively connected to the tailings fixed screen 6 and the concentrate fixed screen 4 through pipelines. The undersize products of the concentrate fixed screen 4 and the tailings fixed screen 6 are respectively connected to the slurry pump 6. The pipeline is connected to the first heavy medium mixing barrel 2, the oversize product outlets of the tailings fixed screen 6 and the concentrate fixed screen 4 are respectively connected to the tailings de-mediation screen 7 and the concentrate de-mediation screen 5, the tailings de-mediation screen 77 and the undersize product outlets of the concentrate de-mediation screen 5 are connected to the magnetic separator 8, the magnetic product outlet of the magnetic separator 8 is connected to the first heavy medium mixing barrel 2 via a pipeline, and the non-magnetic product outlet of the magnetic separator 8 is transported to the return water tank via a pipeline, the oversize product outlet of the concentrate de-mediation screen 5 is directly sold as a coarse-grained concentrate or sent to a mill and flotation, and the oversize material of the tailings de-mediation screen 7 is sold or stored as a coarse-grained tailings;

[0043] The fine-grained desludging unit includes a fine-grained feed trough 9, a first thickening cyclone 10, and a first dewatering screen 11. The undersize outlet of the grading screen 1 is connected to the fine-grained feed trough 9 via a pipeline. The discharge port of the fine-grained feed trough 9 is connected to the feed port of the first thickening cyclone 10 via a second slurry pump. The overflow of the first thickening cyclone 10 is connected to the thickener via a pipeline. The underflow outlet of the first thickening cyclone 10 is connected to the screen distributor of the first dewatering screen 11. The screen product outlet of the first dewatering screen 11 is connected to the heavy medium fine-grained separation unit. The undersize outlet of the first dewatering screen 11 is connected to the fine-grained feed trough 9.

[0044] The heavy medium fine particle separation unit includes a second heavy medium mixing barrel 12 and a fine particle heavy medium cyclone 13. The upper screen outlet of the first dewatering screen 11 is connected to the second heavy medium mixing barrel 12 via a pipeline. The discharge port of the second heavy medium mixing barrel 12 is connected to the feed port end of the fine particle heavy medium cyclone 13 via a third slurry pump. The overflow outlet and underflow outlet of the fine particle heavy medium cyclone 13 are respectively connected to the fine particle de-medium / dewatering unit via pipelines.

[0045] The fine-grained de-mediuming / dehydration unit includes a concentrate collecting tank 14, a tailings collecting tank 15, a concentrate concentrating magnetic separator 15, a tailings concentrating magnetic separator 20, a concentrate scavenging magnetic separator 16, a tailings scavenging magnetic separator 21, a second concentrating cyclone 17, a third concentrating cyclone 22, a second dehydration screen 18 and a third dehydration screen 23. The overflow outlet and the underflow outlet of the fine-grained heavy medium cyclone 13 are respectively connected to the tailings collecting tank 15 and the concentrate collecting tank through pipelines. The tailings collecting tank 15 and the concentrate collecting tank 14 are connected to the tailings concentrating magnetic separator 20 and the concentrate concentrating magnetic separator 15 respectively through the fourth slurry pump and the fifth slurry pump through the pipeline, and the non-magnetic product outlets of the tailings concentrating magnetic separator 20 and the concentrate concentrating magnetic separator 15 are connected to the tailings scavenging magnetic separator 21 and the concentrate scavenging magnetic separator 16 respectively. 1. The magnetic outlet of the concentrate sweeping magnetic separator 8 is returned to the second dense medium mixing drum 12; the non-magnetic outlet of the concentrate sweeping magnetic separator 16 is respectively connected to the second concentrating cyclone 17, and the underflow outlet of the second concentrating cyclone 17 is connected to the second dewatering screen 18. The oversize outlet product of the second dewatering screen 18 is directly sold as a fine-grained concentrate product or sent to grinding and flotation. The overflow outlet of the second concentrating cyclone 17 and the undersize outlet of the second dewatering screen 18 are connected to the concentrate collection tank 14 via a pipeline; the non-magnetic outlet of the tailings sweeping magnetic separator 21 is respectively connected to the third concentrating cyclone 22, and the underflow outlet of the third concentrating cyclone 22 is connected to the inlet of the third dewatering screen 23. The oversize outlet product of the third dewatering screen 23 is directly sold as a fine-grained tailings product or sent to landfill. The overflow outlet of the third concentrating cyclone 22 and the undersize outlet of the third dewatering screen 23 are returned to the tailings collection tank 15 via a pipeline;

[0046] (2) According to step (1), the system selects parameters and runs, the heavy medium in the first heavy medium mixing barrel 2 is ferrosilicon powder, the magnetic content of the ferrosilicon powder is ≥90%, the proportion of -325 mesh fineness is 90%-97%, and the content of -400 mesh is 85%-90%, the density of the heavy medium suspension in the first heavy medium mixing barrel 2 is 1.70-3.20g / cm³, the overflow fineness of the concentrating cyclone is -200 mesh ≥95%, the heavy medium in the second heavy medium mixing barrel 12 is ferrosilicon powder, the magnetic content of the ferrosilicon powder is ≥95%, the fineness of -325 mesh fineness is 90%-97%, and the content of -400 mesh fineness is 85%-90%. 80%-85%, -400 mesh content is 60%-65%, the density of the concentrate collection tank 14 and the tailings collection tank 15 is controlled at 1.10-1.35g / cm3, the mesh size of the first dewatering screen 11 is 0.15-0.30mm, the mesh size of the second dewatering screen 18 is 0.15-0.3mm, the mesh size of the third dewatering screen 23 is 0.15-0.3mm, the pressure of the first slurry pump is 0.1Mpa-0.25Mpa, the pressure of the third slurry pump is 0.1Mpa-0.25Mpa, the heavy medium suspension and the ore are passed through the slurry pump at a pressure of 0.1MPa-0 .25MPa is fed into the heavy medium cyclone and separated under the action of centrifugal force. The bottom flow products of the two heavy medium cyclones are subsequently processed into heavy medium concentrate, and the overflow products are subsequently processed into waste rock. The pressure of the second slurry pump is 0.08Mpa-0.15Mpa, the pressure of the fourth slurry pump is 0.02-0.04Mpa, and the pressure of the fifth slurry pump is 0.02-0.04Mpa. After the above parameters are selected, the system is operated for separation, wherein the first slurry pump and the third slurry pump deliver The slurry delivered is a mixture of heavy medium and ore, with a large overall specific gravity, and requires sufficient power to ensure the effective separation of the target minerals; the material delivered by the second slurry pump is fine-grained material with a small overall specific gravity, and fine-grained concentration operations can be achieved within this pressure range; the fourth and fifth slurry pumps deliver dilute media, and their delivery pressures must meet the delivery capacity while ensuring that the flow rate of the dilute media delivered to the magnetic separator by the fourth and fifth slurry pumps is within the effective working range of the magnetic separator, so that the magnetic separator achieves the best operating effect.

[0047] Furthermore, in the step (1), the mesh size of the grading screen 1 is 0.35-1 mm, and the cone angle of the fine-grained heavy medium cyclone 13 is 40°-150°.

[0048] In the above scheme, the purpose of controlling the mud content of -200 mesh in the fine-grained material is to reduce the mud content of the heavy medium suspension in the heavy medium fine-grained material separation system, thereby improving the separation accuracy of the heavy medium fine-grained material.

[0049] The purpose of controlling the coarse particle gradation of the heavy medium in the second heavy medium mixing barrel 12 is to reduce the viscosity of the heavy medium suspension, thereby improving the separation accuracy of the heavy medium fine particle material.

[0050] The purpose of controlling the optimization of the cone angle of the fine-grained heavy medium cyclone 13 is to reduce the required separation density of the fine-grained materials and weaken the shuttle resistance of the fine-grained materials during the separation process, thereby improving the separation accuracy of the heavy medium fine-grained materials.

[0051] The overflow of the second concentrating cyclone 17 and the screen surface of the second dewatering screen 18 are controlled to return to the concentrate collecting tank 14 through a pipeline, and the overflow of the third concentrating cyclone 22 and the screen surface of the third dewatering screen 23 are controlled to return to the tailings collecting tank 15 through a pipeline. The purpose is to reduce the medium density in the concentrate collecting tank and the tailings collecting tank 15 to 1.10-1.35g / cm3, thereby meeting the working conditions of the magnetic separator 8 and ensuring the medium removal efficiency of the magnetic separator 8.

[0052] Controlling the overflow of the second concentrating cyclone 17 and the screen surface of the second dewatering screen 18 to return to the concentrate collecting tank 14 through a pipeline, and the overflow of the third concentrating cyclone 22 and the screen surface of the third dewatering screen 23 to return to the tailings collecting tank 15 through a pipeline, can improve the dry discharge yield of the fine-grained concentrate and tailings after sorting.

[0053] Example 1:

[0054] A spodumene mine in Australia has a raw ore Li2O grade of 1.50% and a particle size of -8mm. The specific steps are as follows: a full-size heavy medium beneficiation system is used to separate the spodumene. The specific steps are as follows: first, the raw ore is fed from the feed silo to the grading screen 1 via the feed belt, and the product below -8mm is screened. After screening on the grading screen, the 0.5-8mm particle size (85% yield) and the -0.5mm particle size (15% yield) are obtained. The 0.5-8mm particle size product is used as the feed material for the heavy medium coarse particle size separation system, and the -0.5mm particle size product is fed to the fine particle size desludging unit.

[0055] In the first heavy medium mixing barrel 2, ferrosilicon powder (magnetic content ≥ 90%, fineness -325 mesh accounts for 90%-97%, and -400 mesh content is 85%-90%) and water are mixed into a heavy medium suspension with a density of 2.40 g / m3. After being evenly mixed with the 0.5-8 mm particle size ore on the grading screen 1, it is transported to the coarse particle size heavy medium cyclone 3 by the first slurry pump at a pressure of 0.15 MPa for sorting to obtain sand settling product and overflow product. The sand settling products after sorting are passed through the fixed concentrate screen 4 and the concentrate de-media screen 5 in turn. After being rinsed with water, the heavy medium is removed. The oversize product of the concentrate de-media screen 5 is obtained as the gravity-separated concentrate with a grade of 5.50%. The concentrate recovery rate of this operation is 20%. The overflow products after sorting are passed through the fixed tailings screen 6 and the tailings de-media screen 7 in turn. After being rinsed with water, the heavy medium is removed. The oversize product of the tailings de-media screen 7 is obtained as the gravity-separated tailings with a grade of 0.55%.

[0056] The -0.5 mm fine-grained material is fed into the fine-grained feed trough 9 and delivered to the first concentrating cyclone 10 at 0.1 MPa using a second slurry pump for graded concentration. The underflow from the first concentrating cyclone 10 is dewatered by the first dewatering screen 11 to obtain a fine-grained spodumene material (yield: 10%), which is then fed to the dense medium fine-grained separation unit. The overflow from the first concentrating cyclone has a fineness of -200 mesh (98%) and is fed to the thickener.

[0057] In the second heavy medium mixing barrel 12, ferrosilicon powder (magnetic content ≥95%, fineness -325 mesh content of 80%-85%, -400 mesh content of 60%-65%) is mixed with water to form a heavy medium suspension with a density of 2.00 g / m3. After being evenly mixed with the fine-grained material on the first dewatering screen 11, it is transported to the fine-grained heavy medium cyclone 13 at a pressure of 0.15 MPa by a third slurry pump for sorting to obtain a sand settling product and an overflow product.

[0058] The sand settling product after sorting by the fine-grained heavy medium cyclone 13 is fed into the concentrate collection tank with a density of 2.35 g / cm3. It is prepared into a slurry suspension of 1.35 g / cm3 through the automatic water replenishment system and transported to the concentrate concentration magnetic separator 15 by the third slurry pump at a pressure of 0.03 MPa. The non-magnetic material outlet of the concentrate concentration magnetic separator 15 is connected to the concentrate scavenging magnetic separator 16. The non-magnetic material of the concentrate scavenging magnetic separator 16 is connected to the second concentrating cyclone 17. The underflow of the second concentrating cyclone 17 is fed into the second dewatering screen 18. The upper screen of the second dewatering screen 18 is fine-grained concentrate with a grade of 5.25% and a yield of 2.5%. It can be directly sold or sent to grinding and flotation. The overflow of the second concentrating cyclone 17 and the underflow of the second dewatering screen 18 are returned to the water replenishment system of the concentrate collection tank 14 through a pipeline.

[0059] The overflow product after sorting in the fine-grained heavy medium cyclone 13 is fed into the tailings collection tank 19 with a density of 1.56 g / cm3. It is prepared into a slurry suspension of 1.15 g / cm3 through the automatic water replenishment system and transported to the tailings concentration magnetic separator 20 by the fourth slurry pump at a pressure of 0.03 MPa. The non-magnetic material outlet of the tailings concentration magnetic separator 20 is connected to the tailings scavenging magnetic separator 21. The non-magnetic material of the tailings scavenging magnetic separator 21 is connected to the third concentrating cyclone 22. The underflow of the third concentrating cyclone 22 is fed into the third dewatering screen 23. The upper part of the third dewatering screen 23 is fine-grained tailings with a grade of 0.45%. The overflow of the third concentrating cyclone 17 and the underflow of the third dewatering screen 18 are returned to the water replenishment system of the tailings collection tank 19 through a pipeline.

[0060] The advantages of the traditional heavy medium separation process and the full-size heavy medium separation system of this application are compared in Table 1:

[0061]

[0062] Conclusion: As can be seen from Table 1, the ore re-separation yield of the present invention is 10% higher than that of the traditional heavy medium separation process, and a fine-grained concentrate product with a yield of 2.5% is produced. The grade of the fine-grained concentrate is 5.25%, which can be sold as a direct product. The comprehensive recovery rate of the concentrate is 82%. Compared with the traditional process, the concentrate recovery rate is increased by 8.67%, and the economic benefits are significant.

[0063] Example 2:

[0064] In a lead-zinc mine in Guangxi, the Pb+Zn grade of the raw ore is 4.5%, and the particle size is -15mm. The specific steps are as follows: a full-size heavy medium beneficiation system is used to separate the spodumene. The specific steps are as follows: first, the raw ore is fed from the feed silo to the grading screen 1 via the feed belt, and the products below -8mm are screened. After screening on the grading screen, the 0.75-15mm particle size (80% yield) and -0.75mm particle size (20% yield) are obtained. The 0.5-15mm particle size product is used as the feed material for the heavy medium coarse particle size separation system, and the -0.75mm particle size product is fed to the fine particle size desludging unit.

[0065] In the first heavy medium mixing barrel 2, ferrosilicon powder (magnetic content ≥ 90%, fineness -325 mesh accounts for 90%-97%, and -400 mesh content is 85%-90%) and water are mixed into a heavy medium suspension with a density of 2.35 g / m3. After being evenly mixed with the 0.75-15 mm particle size ore on the grading screen 1, it is transported to the coarse particle size heavy medium cyclone 3 by the first slurry pump at a pressure of 0.15 MPa for sorting to obtain sand settling product and overflow product. The sand settling products after sorting are passed through the fixed concentrate screen 4 and the concentrate de-media screen 5 in turn. After being rinsed with water, the heavy medium is removed. The oversize product of the concentrate de-media screen 5 is obtained as the gravity-separated concentrate with a grade of 7.50%. The concentrate recovery rate of this operation is 40%. The overflow products after sorting are passed through the fixed tailings screen 6 and the tailings de-media screen 7 in turn. After being rinsed with water, the heavy medium is removed. The oversize product of the tailings de-media screen 7 is obtained as the gravity-separated tailings with a grade of 0.35%.

[0066] The -0.75mm fine-grained material is fed into the fine-grained feed trough 9 and pumped by a second slurry pump to the first concentrating cyclone 10 for graded concentration. The underflow from the first concentrating cyclone 10 is dewatered by the first dewatering screen 11 to obtain fine-grained lead-zinc ore (yield 15%), which is then fed to the dense medium fine-grained separation unit. The overflow fineness of the first concentrating cyclone is -200 mesh, 95%, and is fed to the thickener.

[0067] In the second heavy medium mixing barrel 12, ferrosilicon powder (magnetic content ≥95%, fineness -325 mesh content of 80%-85%, -400 mesh content of 60%-65%) is mixed with water to form a heavy medium suspension with a density of 1.98 g / m3. After being evenly mixed with the fine-grained material on the first dewatering screen 11, it is transported to the fine-grained heavy medium cyclone 13 at a pressure of 0.15 MPa by a second slurry pump for sorting to obtain a sand settling product and an overflow product.

[0068] The sand settling product after sorting by the fine-grained heavy medium cyclone 13 is fed into the concentrate collection tank with a density of 2.30 g / cm3. It is prepared into a slurry suspension of 1.35 g / cm3 through the automatic water replenishment system and transported to the concentrate concentration magnetic separator 15 by the third slurry pump at a pressure of 0.03 MPa. The non-magnetic material outlet of the concentrate concentration magnetic separator 15 is connected to the concentrate scavenging magnetic separator 16. The non-magnetic material of the concentrate scavenging magnetic separator 16 is connected to the second concentrating cyclone 17. The underflow of the second concentrating cyclone 17 is fed into the second dewatering screen 18. The upper screen of the second dewatering screen 18 is fine-grained concentrate with a grade of 7.00% and a yield of 8%. It can be directly sold or sent to grinding and flotation. The overflow of the second concentrating cyclone 17 and the underflow of the second dewatering screen 18 are returned to the water replenishment system of the concentrate collection tank 14 through a pipeline.

[0069] The overflow product after sorting in the fine-grained heavy medium cyclone 13 is fed into the tailings collection tank 19 with a density of 1.52 g / cm3. It is prepared into a slurry suspension of 1.15 g / cm3 through the automatic water replenishment system and transported to the tailings concentration magnetic separator 20 by the fourth slurry pump at a pressure of 0.03 MPa. The non-magnetic material outlet of the tailings concentration magnetic separator 20 is connected to the tailings scavenging magnetic separator 21. The non-magnetic material of the tailings scavenging magnetic separator 21 is connected to the third concentrating cyclone 22. The underflow of the third concentrating cyclone 22 is fed into the third dewatering screen 23. The upper part of the third dewatering screen 23 is fine-grained tailings with a grade of 0.45%. The overflow of the third concentrating cyclone 17 and the underflow of the third dewatering screen 18 are returned to the water replenishment system of the tailings collection tank 19 through a pipeline.

[0070] The advantages of the traditional heavy medium separation process and the full-size heavy medium separation system of this application are compared in Table 2:

[0071]

[0072] Conclusion: As can be seen from Table 2, the ore yield of the present invention is 15% higher than that of the traditional heavy medium separation process, and the fine-grained concentrate product with a yield of 8.0% is produced. The grade of the fine-grained concentrate is 7.0%, which can be used as a direct product to enter the mill and flotation, reducing the amount of fine-grained concentrate entering the ball mill. The comprehensive recovery rate of the concentrate is 79.11%, which is 12.45% higher than that of the traditional process, and the economic benefit is significant.

[0073] Example 3:

[0074] In a fluorite mine in Zhejiang Province, the CaF2 grade of the raw ore is 35% and the particle size is -20mm. The specific steps are as follows: a full-size heavy medium beneficiation system is used to separate the spodumene. The specific steps are as follows: first, the raw ore is fed from the feed silo to the grading screen 1 via the feed belt, and the products below -20mm are screened. After screening on the grading screen, 1-20mm particle size (75% yield) and -1mm particle size (25% yield) are obtained. The 1-20mm particle size product is used as the feed for the heavy medium coarse particle size separation system, and the -1mm particle size product is fed to the fine particle size desludging unit.

[0075] In the first heavy medium mixing barrel 2, ferrosilicon powder (magnetic content ≥ 90%, fineness -325 mesh accounts for 90%-97%, and -400 mesh content is 85%-90%) and water are mixed into a heavy medium suspension with a density of 2.00 g / m3. After being uniformly mixed with the 1-20 mm particle size ore on the grading screen 1, it is transported to the coarse particle size heavy medium cyclone 3 by the first slurry pump at a pressure of 0.15 MPa for sorting to obtain a sand settling product and an overflow product. The sand settling products after sorting are passed through the fixed concentrate screen 4 and the concentrate de-media screen 5 in turn. After being rinsed with water, the heavy medium is removed. The oversize product of the concentrate de-media screen 5 is obtained as the gravity-separated concentrate. The grade of the gravity-separated concentrate is 75%. The concentrate recovery rate of this operation is 30%. The overflow products after sorting are passed through the fixed tailings screen 6 and the tailings de-media screen 7 in turn. After being rinsed with water, the heavy medium is removed. The oversize product of the tailings de-media screen 7 is obtained as the gravity-separated tailings. The grade of the tailings is 6%.

[0076] The -1mm fine-grained material is fed into the fine-grained feed trough 9 and pumped by a second slurry pump to the first concentrating cyclone 10 for graded concentration. The underflow from the first concentrating cyclone 10 is dewatered by the first dewatering screen 11 to produce fine-grained fluorite ore (yield 20%), which is then fed to the dense medium fine-grained separation unit. The overflow from the first concentrating cyclone has a fineness of 95% of -200 mesh and is fed to the thickener.

[0077] In the second heavy medium mixing barrel 12, ferrosilicon powder (magnetic content ≥95%, fineness -325 mesh content of 80%-85%, -400 mesh content of 60%-65%) is mixed with water to form a heavy medium suspension with a density of 1.80 g / m3. After being evenly mixed with the fine-grained material on the first dewatering screen 11, it is transported to the fine-grained heavy medium cyclone 13 at a pressure of 0.15 MPa by a second slurry pump for sorting to obtain a sand settling product and an overflow product.

[0078] The sand settling product after sorting by the fine-grained heavy medium cyclone 13 is fed into the concentrate collection tank with a density of 2.00 g / cm3. It is prepared into a slurry suspension of 1.30 g / cm3 through the automatic water replenishment system and transported to the concentrate concentration magnetic separator 15 by the third slurry pump at a pressure of 0.03 MPa. The non-magnetic material outlet of the concentrate concentration magnetic separator 15 is connected to the concentrate scavenging magnetic separator 16. The non-magnetic material of the concentrate scavenging magnetic separator 16 is connected to the second concentrating cyclone 17. The underflow of the second concentrating cyclone 17 is fed into the second dewatering screen 18. The upper screen of the second dewatering screen 18 is fine-grained concentrate with a grade of 72% and a yield of 8%. It can be directly sold or sent to grinding and flotation. The overflow of the second concentrating cyclone 17 and the underflow of the second dewatering screen 18 are returned to the water replenishment system of the concentrate collection tank 14 through a pipeline.

[0079] The overflow product after sorting in the fine-grained heavy medium cyclone 13 is fed into the tailings collection tank 19 with a density of 1.35 g / cm3. It is prepared into a slurry suspension of 1.15 g / cm3 through the automatic water replenishment system and transported to the tailings concentration magnetic separator 20 by the fourth slurry pump at a pressure of 0.03 MPa. The non-magnetic material outlet of the tailings concentration magnetic separator 20 is connected to the tailings scavenging magnetic separator 21. The non-magnetic material of the tailings scavenging magnetic separator 21 is connected to the third concentrating cyclone 22. The underflow of the third concentrating cyclone 22 is fed into the third dewatering screen 23. The upper part of the third dewatering screen 23 is fine-grained tailings with a grade of 5.5%. The overflow of the third concentrating cyclone 17 and the underflow of the third dewatering screen 18 are returned to the water replenishment system of the tailings collection tank 19 through a pipeline.

[0080] The advantages of the traditional heavy medium separation process and the full-size heavy medium separation system of this application are compared in Table 3:

[0081]

[0082] Conclusion: As can be seen from Table 3, the ore input gravity separation yield of the present invention is 20% higher than that of the traditional heavy medium separation process, and the output is a fine-grained concentrate product with a yield of 8.0%. The grade of the fine-grained concentrate is 72%, which can be sold as a direct product. The comprehensive recovery rate of the concentrate is 80.74%. Compared with the traditional process, the concentrate recovery rate is increased by 16.45%, and the economic benefits are significant.

[0083] Example 4:

[0084] In a tungsten mine in Jiangxi Province, the WO3 grade of the raw ore is 0.2% and the particle size is -10mm. The specific steps are as follows: a full-size heavy medium beneficiation system is used to separate the spodumene. The specific steps are as follows: first, the raw ore is fed from the feed silo to the grading screen 1 via the feed belt, and the products below -10mm are screened. After screening on the grading screen, the 0.5-10mm particle size (75% yield) and -0.5mm particle size (25% yield) are obtained. The 0.5-10mm particle size product is used as the feed for the heavy medium coarse particle size separation system, and the -0.5mm particle size product is fed to the fine particle size desludging unit.

[0085] In the first heavy medium mixing barrel 2, ferrosilicon powder (magnetic content ≥ 90%, fineness -325 mesh accounts for 90%-97%, and -400 mesh content is 85%-90%) and water are mixed into a heavy medium suspension with a density of 1.80 g / m3. After being evenly mixed with the 0.5-10 mm particle size ore on the grading screen 1, it is transported to the coarse particle size heavy medium cyclone 3 by the first slurry pump at a pressure of 0.15 MPa for sorting to obtain sand settling product and overflow product. The sand settling products after sorting are passed through the fixed concentrate screen 4 and the concentrate de-media screen 5 in turn. After being rinsed with water, the heavy medium is removed. The oversize product of the concentrate de-media screen 5 is obtained as the gravity-separated concentrate with a grade of 0.55%. The concentrate recovery rate of this operation reaches 30%. The overflow products after sorting are passed through the fixed tailings screen 6 and the tailings de-media screen 7 in turn. After being rinsed with water, the heavy medium is removed. The oversize product of the tailings de-media screen 7 is obtained as the gravity-separated tailings with a grade of 0.03%.

[0086] -1mm fine-grained material is fed into the fine-grained feed trough 9 and pumped by a second slurry pump to the first concentrating cyclone 10 for graded concentration. The underflow from the first concentrating cyclone 10 is dewatered by the first dewatering screen 11 to obtain fine-grained ore material (yield 20%), which is then fed to the dense medium fine-grained separation unit. The overflow fineness of the first concentrating cyclone is -200 mesh, 95%, and is fed to the thickener.

[0087] In the second heavy medium mixing barrel 12, ferrosilicon powder (magnetic content ≥95%, fineness -325 mesh content of 80%-85%, -400 mesh content of 60%-65%) is mixed with water to form a heavy medium suspension with a density of 1.60 g / m3. After being evenly mixed with the fine-grained material on the first dewatering screen 11, it is transported to the fine-grained heavy medium cyclone 13 at a pressure of 0.15 MPa by a second slurry pump for sorting to obtain a sand settling product and an overflow product.

[0088] The sand settling product after sorting by the fine-grained heavy medium cyclone 13 is fed into the concentrate collection tank with a density of 2.00 g / cm3. It is prepared into a slurry suspension of 1.30 g / cm3 through the automatic water replenishment system and transported to the concentrate concentration magnetic separator 15 by the third slurry pump at a pressure of 0.03 MPa. The non-magnetic material outlet of the concentrate concentration magnetic separator 15 is connected to the concentrate scavenging magnetic separator 16. The non-magnetic material of the concentrate scavenging magnetic separator 16 is connected to the second concentrating cyclone 17. The underflow of the second concentrating cyclone 17 is fed into the second dewatering screen 18. The upper screen of the second dewatering screen 18 is fine-grained concentrate with a grade of 0.45% and a yield of 6%. It can be directly sold or sent to grinding and flotation. The overflow of the second concentrating cyclone 17 and the underflow of the second dewatering screen 18 are returned to the water replenishment system of the concentrate collection tank 14 through a pipeline.

[0089] The overflow product after sorting in the fine-grained heavy medium cyclone 13 is fed into the tailings collection tank 19 with a density of 1.30 g / cm3. It is prepared into a slurry suspension of 1.15 g / cm3 through the automatic water replenishment system and transported to the tailings concentration magnetic separator 20 by the fourth slurry pump at a pressure of 0.03 MPa. The non-magnetic material outlet of the tailings concentration magnetic separator 20 is connected to the tailings scavenging magnetic separator 21. The non-magnetic material of the tailings scavenging magnetic separator 21 is connected to the third concentrating cyclone 22. The underflow of the third concentrating cyclone 22 is fed into the third dewatering screen 23. The upper part of the third dewatering screen 23 is fine-grained tailings with a grade of 0.035%. The overflow of the third concentrating cyclone 17 and the underflow of the third dewatering screen 18 are returned to the water replenishment system of the tailings collection tank 19 through a pipeline.

[0090] The advantages of the traditional heavy medium separation process and the full-size heavy medium separation system of this application are compared in Table 4:

[0091]

[0092] Conclusion: As can be seen from Table 4, the ore yield of the present invention is 20% higher than that of the traditional heavy medium separation process, and a fine-grained concentrate product with a yield of 6.0% is produced. The grade of the fine-grained concentrate is 0.4%, which can be used as a direct product to enter the mill and flotation, reducing the amount of fine-grained concentrate entering the ball mill. The comprehensive recovery rate of the concentrate is 94.50%, which is 12% higher than that of the traditional process, and the economic benefit is significant.

Claims

1. A full-size heavy medium beneficiation system, characterized in that The system comprises a grading unit, a heavy medium coarse-grained grade separation unit, a fine-grained grade desliming unit, a heavy medium fine-grained grade separation unit, and a fine-grained grade demediation / dehydration unit. The grading unit is a unit for dividing materials into coarse-grained grade and fine-grained grade. The coarse-grained grade outlet of the grading unit is connected to the heavy medium coarse-grained grade separation unit. The fine-grained grade outlet of the grading unit is sequentially connected to the fine-grained grade desliming unit, the heavy medium fine-grained grade separation unit, and the fine-grained grade demediation / dehydration unit. The grading unit divides the selected materials into two grade products of coarse-grained grade and fine-grained grade. The coarse-grained grade enters the heavy medium coarse-grained grade separation unit for sorting to obtain a coarse-grained grade concentrate and a coarse-grained grade tailings. The fine-grained grade enters the fine-grained grade desliming unit, the heavy medium fine-grained grade separation unit, the fine-grained grade demediation, and the dehydration unit sequentially to obtain a final fine-grained grade concentrate and a fine-grained grade tailings.

2. A full-size heavy medium beneficiation system according to claim 1, characterized in that The grading unit includes a feed trough, a grading screen, a discharge trough and an under-screen chute. The outlet of the feed trough is connected to the inlet of the grading screen, the above-screen outlet of the grading screen is connected to the inlet of the discharge trough, the discharge trough is connected to the heavy medium coarse particle separation unit via the under-screen chute, the fine particle material outlet output from the under-screen outlet of the grading screen is connected to the under-screen chute, and the under-screen chute is connected to the fine particle desludging unit via a pipeline.

3. A full-size heavy medium beneficiation system according to claim 1, characterized in that The heavy medium coarse particle separation unit comprises a first heavy medium mixing barrel, a coarse particle heavy medium cyclone, a concentrate fixed screen, a concentrate de-mediation screen, a tailings fixed screen, a tailings de-mediation screen and a magnetic separator. The inlet of the first heavy medium mixing barrel is connected to the discharge trough in the classification unit. The outlet of the first heavy medium mixing barrel is connected to the inlet of the coarse particle heavy medium cyclone via a first slurry pump. The overflow outlet and the underflow outlet of the coarse particle heavy medium cyclone are respectively connected to the tailings fixed screen and the concentrate fixed screen via pipelines. The under-screen products of the concentrate fixed screen and the tailings fixed screen are respectively connected to the pipes. The pipeline is connected to the first heavy medium mixing barrel, the over-screen product outlets of the tailings fixed screen and the concentrate fixed screen are respectively connected to the tailings de-mediating screen and the concentrate de-mediating screen, the under-screen product outlets of the tailings de-mediating screen 7 and the concentrate de-mediating screen are connected to the magnetic separator, the magnetic product outlet of the magnetic separator is connected to the first heavy medium mixing barrel through a pipeline, the non-magnetic product outlet of the magnetic separator is transported to the return water tank through a pipeline, the over-screen product outlet of the concentrate de-mediating screen is directly sold as a coarse-grained concentrate or put into grinding and flotation, and the over-screen material of the tailings de-mediating screen is sold or stored as coarse-grained tailings.

4. A full-size heavy medium beneficiation system according to claim 1, characterized in that The fine-grained desludging unit comprises a fine-grained feed trough, a first concentrating cyclone, and a first dewatering screen. The under-screen outlet of the grading screen is connected to the fine-grained feed trough via a pipeline, the discharge port of the fine-grained feed trough is connected to the feed port end of the first concentrating cyclone via a second slurry pump, the overflow of the first concentrating cyclone is connected to the thickener via a pipeline, the underflow outlet of the first concentrating cyclone is connected to the screen distributor of the first dewatering screen, the product outlet on the first dewatering screen is connected to the heavy medium fine-grained separation unit, and the under-screen outlet of the first dewatering screen is connected to the fine-grained feed trough.

5. A full-size heavy medium beneficiation system according to claim 1, characterized in that The heavy medium fine particle separation unit includes a second heavy medium mixing barrel and a fine particle heavy medium cyclone. The upper screen outlet of the first dewatering screen is connected to the second heavy medium mixing barrel via a pipeline, the discharge port of the second heavy medium mixing barrel is connected to the feed port end of the fine particle heavy medium cyclone via a third slurry pump, and the overflow outlet and underflow outlet of the fine particle heavy medium cyclone are respectively connected to the fine particle de-medium / dewatering unit via pipelines.

6. A full-size heavy medium beneficiation system according to claim 1, characterized in that The fine-grained de-mediuming / dehydration unit comprises a concentrate collecting tank, a tailings collecting tank, a concentrate concentrating magnetic separator, a tailings concentrating magnetic separator, a concentrate scavenging magnetic separator, a tailings scavenging magnetic separator, a second concentrating cyclone, a third concentrating cyclone, a second dehydration screen and a third dehydration screen, the overflow outlet and the underflow outlet of the fine-grained heavy medium cyclone are respectively connected to the tailings collecting tank and the concentrate collecting tank via pipelines, the tailings collecting tank and the concentrate collecting tank are respectively connected to the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator via pipelines via the fourth slurry pump and the fifth slurry pump, the non-magnetic product outlets of the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator are respectively connected to the tailings scavenging magnetic separator and the concentrate scavenging magnetic separator, the tailings concentrating magnetic separator, the concentrate concentrating magnetic separator, the tailings scavenging magnetic separator, the concentrate scavenging magnetic separator The magnetic outlet of the separator returns again to be connected to the second heavy medium mixing barrel; the non-magnetic outlets of the concentrate scavenging magnetic separator are respectively connected to the second thickening cyclone, the underflow outlet of the second thickening cyclone is connected to the second dewatering screen, the on-screen outlet products of the second dewatering screen are directly sold or fed to the mill and float as fine-grained concentrate products, the overflow outlet of the second thickening cyclone and the under-screen outlet of the second dewatering screen are connected to the concentrate collecting tank through pipelines; the non-magnetic outlets of the tailings scavenging magnetic separator are respectively connected to the third thickening cyclone, the underflow outlet of the third thickening cyclone is connected to the inlet of the third dewatering screen, the on-screen outlet products of the third dewatering screen are directly sold or landfilled as fine-grained tailings products, the overflow outlet of the third thickening cyclone and the under-screen outlet of the third dewatering screen are returned through pipelines to be connected to the tailings collecting tank.

7. A mineral processing method for a full-size heavy medium mineral processing system, characterized in that The beneficiation steps are as follows: (1) Preparation of a full-grade heavy medium beneficiation system: The system includes a classification unit, a heavy medium coarse-grade separation unit, a fine-grade desliming unit, a heavy medium fine-grade separation unit, and a fine-grade desliming / dehydration unit. The classification unit is a unit for separating materials into coarse-grade and fine-grade grades. The coarse-grade outlet of the classification unit is connected to the heavy medium coarse-grade separation unit. The fine-grade outlet of the classification unit is connected to the fine-grade desliming unit, the heavy medium fine-grade separation unit, and the fine-grade desliming / dehydration unit in sequence. The classification unit separates the selected materials into two grade products, namely, coarse-grade and fine-grade grades. The coarse-grade grade enters the heavy medium coarse-grade separation unit for separation to obtain coarse-grade concentrate and coarse-grade tailings. The fine-grade grade enters the fine-grade desliming unit, the heavy medium fine-grade separation unit, the fine-grade desliming unit, and the dehydration unit in sequence to obtain the final fine-grade concentrate and fine-grade tailings. The grading unit comprises a feed trough, a grading screen, a discharge trough and an under-screen chute, the outlet of the feed trough is connected to the inlet of the grading screen, the upper screen outlet of the grading screen is connected to the inlet of the discharge trough, the discharge trough is connected to the heavy medium coarse particle separation unit via the under-screen chute, the fine particle material outlet outputted from the under-screen outlet of the grading screen is connected to the under-screen chute, and the under-screen chute is connected to the fine particle desludging unit via a pipeline; The heavy medium coarse particle separation unit comprises a first heavy medium mixing barrel, a coarse particle heavy medium cyclone, a concentrate fixed screen, a concentrate de-mediation screen, a tailings fixed screen, a tailings de-mediation screen and a magnetic separator. The inlet of the first heavy medium mixing barrel is connected to the discharge trough in the classification unit. The outlet of the first heavy medium mixing barrel is connected to the inlet of the coarse particle heavy medium cyclone via a first slurry pump. The overflow outlet and the underflow outlet of the coarse particle heavy medium cyclone are respectively connected to the tailings fixed screen and the concentrate fixed screen via pipelines. The under-screen products of the concentrate fixed screen and the tailings fixed screen are respectively connected to the pipes. The pipeline is connected to the first heavy medium mixing barrel, the oversize product outlets of the tailings fixed screen and the concentrate fixed screen are connected to the tailings de-mediation screen and the concentrate de-mediation screen respectively, the tailings de-mediation screen 7 and the concentrate de-mediation screen undersize product outlets are connected to the magnetic separator, the magnetic product outlet of the magnetic separator is connected to the first heavy medium mixing barrel through a pipeline, the non-magnetic product outlet of the magnetic separator is transported to the return water tank through a pipeline, the oversize product outlet of the concentrate de-mediation screen is directly sold as a coarse-grained concentrate or fed into a mill and flotation, and the oversize material of the tailings de-mediation screen is sold or stored as a coarse-grained tailings; The fine-grained desludging unit comprises a fine-grained feed trough, a first concentrating cyclone, and a first dewatering screen. The under-screen outlet of the grading screen is connected to the fine-grained feed trough via a pipeline. The discharge port of the fine-grained feed trough is connected to the feed port end of the first concentrating cyclone via a second slurry pump. The overflow of the first concentrating cyclone is connected to the thickener via a pipeline. The underflow outlet of the first concentrating cyclone is connected to the upper screen distributor of the first dewatering screen. The upper product outlet of the first dewatering screen is connected to the heavy medium fine-grained separation unit. The under-screen outlet of the first dewatering screen is connected to the fine-grained feed trough. The heavy medium fine particle separation unit comprises a second heavy medium mixing barrel and a fine particle heavy medium cyclone. The screen outlet of the first dewatering screen is connected to the second heavy medium mixing barrel via a pipeline. The discharge port of the second heavy medium mixing barrel is connected to the feed port end of the fine particle heavy medium cyclone via a third slurry pump. The overflow outlet and the underflow outlet of the fine particle heavy medium cyclone are respectively connected to the fine particle dewatering / demediation unit via pipelines. The fine-grained de-mediuming / dehydration unit comprises a concentrate collecting tank, a tailings collecting tank, a concentrate concentrating magnetic separator, a tailings concentrating magnetic separator, a concentrate scavenging magnetic separator, a tailings scavenging magnetic separator, a second concentrating cyclone, a third concentrating cyclone, a second dehydration screen and a third dehydration screen, the overflow outlet and the underflow outlet of the fine-grained heavy medium cyclone are respectively connected to the tailings collecting tank and the concentrate collecting tank via pipelines, the tailings collecting tank and the concentrate collecting tank are respectively connected to the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator via pipelines via the fourth slurry pump and the fifth slurry pump, the non-magnetic product outlets of the tailings concentrating magnetic separator and the concentrate concentrating magnetic separator are respectively connected to the tailings scavenging magnetic separator and the concentrate scavenging magnetic separator, the tailings concentrating magnetic separator, the concentrate concentrating magnetic separator, the tailings scavenging magnetic separator, the concentrate scavenging magnetic separator The magnetic outlet of the separator returns again to be connected to the second heavy medium mixing barrel; the non-magnetic outlet of the concentrate scavenging magnetic separator is respectively connected to the second concentrating cyclone, the underflow outlet of the second concentrating cyclone is connected to the second dewatering screen, the over-screen outlet product of the second dewatering screen is directly sold or fed to the mill and float as a fine-grained concentrate product, the overflow outlet of the second concentrating cyclone and the under-screen outlet of the second dewatering screen are connected to the concentrate collecting tank via a pipeline; the non-magnetic outlet of the tailings scavenging magnetic separator is respectively connected to the third concentrating cyclone, the underflow outlet of the third concentrating cyclone is connected to the inlet of the third dewatering screen, the over-screen outlet product of the third dewatering screen is directly sold or landfilled as a fine-grained tailings product, the overflow outlet of the third concentrating cyclone and the under-screen outlet of the third dewatering screen are returned via a pipeline to be connected to the tailings collecting tank; According to step (1), the system selects parameters and runs, the heavy medium in the first heavy medium mixing barrel is ferrosilicon powder, the magnetic content of the ferrosilicon powder is ≥90%, the proportion of -325 mesh fineness is 90%-97%, and the content of -400 mesh is 85%-90%, the density of the heavy medium suspension in the first heavy medium mixing barrel is 1.70-3.20g / cm³, the overflow fineness of the concentrating cyclone is -200 mesh ≥95%, the heavy medium in the second heavy medium mixing barrel is ferrosilicon powder, the magnetic content of the ferrosilicon powder is ≥95%, the fineness of -325 mesh content is 90%-97%, and the content of -400 mesh content is 85%-90%. The content of -400 mesh is 80%-85%, the content of -400 mesh is 60%-65%, the density of the concentrate collection tank and the tailings collection tank is controlled at 1.10-1.35g / cm3, the mesh size of the first dewatering screen is 0.15-0.30mm, the mesh size of the second dewatering screen is 0.15-0.3mm, the mesh size of the third dewatering screen is 0.15-0.3mm, the pressure of the first slurry pump is 0.1Mpa-0.25Mpa, the pressure of the third slurry pump is 0.1Mpa-0.25Mpa, the heavy medium suspension and the ore are pumped by the slurry pump at a pressure of 0 .1MPa - 0.25MPa is fed into the heavy medium cyclone and sorted under the action of centrifugal force. The underflow products of the two-product heavy medium cyclones are subsequently treated to become heavy medium concentrates, and the overflow products are subsequently treated to become waste rock. The pressure of the second slurry pump is 0.08Mpa-0.15Mpa, the pressure of the fourth slurry pump is 0.02-0.04Mpa, and the pressure of the fifth slurry pump is 0.02-0.04Mpa.

8. The ore dressing method of a full-size heavy medium ore dressing system according to claim 7, characterized in that In the step (1), the aperture size of the grading screen is 0.35-1 mm, and the cone angle of the fine-grained heavy medium cyclone is 40°-150°.

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