Pre-enrichment layering device for micro-fine particle low-grade tailings

Abstract

The utility model discloses a micro-fine particle low-grade tailing pre-enrichment layering device which comprises an enrichment layering barrel and a raising assembly, the upper end of the enrichment layering barrel is provided with a small-specific-gravity overflow port, the lower end of the enrichment layering barrel is provided with a large-specific-gravity discharge port, and the raising assembly comprises a plurality of raising aeration column sets distributed from top to bottom in the height direction of the enrichment layering barrel. And each upward-raising aeration column group comprises a plurality of upward-raising aeration ports which are arranged in the enriching and layering barrel in a surrounding manner and have upward spraying directions. The ore pulp particles entering the enriching and layering barrel are raised upwards through bubbles overflowing from the upward-raising aeration opening, so that the small-specific-gravity ore particles are continuously scoured by the buoyancy of water and the drag force of the ore pulp, float upwards to the upper end of the enriching and layering barrel and are discharged from the small-specific-gravity overflow opening; the large-specific-gravity ore grains overcome buoyancy of water and drag force of ore pulp due to self gravity to continuously sink, and are discharged from a large-specific-gravity discharge port in the lower end of the enrichment layering barrel; therefore, micro-fine particle grade mineral aggregate separation of the ore pulp is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of ore sorting, in particular to a device for pre-enrichment and stratification of micro-grained low-grade tailings. Background Art

[0002] As the mineral resources become more scarce and finer, the cost of mineral processing becomes higher and higher. The comprehensive utilization of mineral resources is becoming more and more important. Pre-disposal or low-cost recovery of valuable metals from tailings is a promising development direction of mineral processing technology, and gravity separation technology is one of the most cost-effective mineral processing technologies. Based on the principles of gravity separation and centrifugal separation, researchers have designed shaking tables, spiral chutes, liquid-solid fluidized bed separators, water-medium (heavy medium) cyclones, spiral classifiers, horizontal / vertical centrifugal separators, Nelson separators, countercurrent gravity separation columns, and stirred fluidized bed gravity separation columns.

[0003] For example, the patent document with patent number CN201410305266.7 provides an air jet mineral particle sorting method and device, which utilizes multiple independent air jets to form a changing fluid drag field in the sorting chamber. The multi-component mineral particles entering the sorting chamber move under the synergistic effect of gravity and airflow drag. Mineral particles of different densities have different motion trajectories. At the same time, the degree of separation of the motion trajectories of the mineral particles in the changing fluid drag field will be continuously enhanced. Finally, the sorted mineral particles of different densities fall into multiple aggregate chutes arranged laterally, thereby obtaining a variety of products with different densities and realizing efficient sorting of mineral particles.

[0004] However, the method of screening multi-component mineral particles by forming a changing fluid drag field in the sorting chamber through air jet can only effectively recover materials of 3mm to 38um, and the sorting effect of fine-grained minerals smaller than 38um is poor, the sorting particle size is narrow, and the metal recovery rate is low. Therefore, the recycling of fine-grained valuable metals will be an inevitable trend in the development of gravity separation equipment in the future. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, the utility model provides a fine-grained low-grade tailings pre-enrichment and stratification device, which lifts up small-density ore particles by an upward jet of water, so that the small-density ore particles are separated from the large-density ore particles under the action of the buoyancy of water and the drag of the slurry, thereby reducing the lower limit of the separation particle size of high-density minerals, strengthening the difference in mineral specific gravity, and realizing the separation of fine-grained ore materials.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: to provide a fine-grained low-grade tailings pre-enrichment and stratification device, which includes an enhanced stirring barrel and an enrichment and stratification barrel, the material output port of the enhanced stirring barrel is connected to the material input port of the enrichment and stratification barrel, wherein the enhanced stirring barrel is provided with a strong stirring motor and a strong stirring shaft, the power output shaft of the strong stirring motor is connected to the strong stirring shaft, the strong stirring shaft is coaxially arranged in the enhanced stirring barrel, and its lower end bearing is positioned at the bottom of the enhanced stirring barrel; the upper end of the enrichment and stratification barrel is provided with a small specific gravity overflow port, and the lower end is provided with a large specific gravity discharge port, and an upward component is provided in the barrel, and the upward component includes a plurality of groups of upward aeration array groups distributed from top to bottom along the height direction of the enrichment and stratification barrel, and each group of upward aeration array groups includes a plurality of upward aeration ports arranged around the enrichment and stratification barrel and with the spraying direction upward.

[0007] Preferably, the strong stirring shaft is provided with multiple layers of transverse stirring impellers distributed along the longitudinal direction of the shaft.

[0008] Preferably, the lateral extension radius of the lateral stirring impeller is 2 / 3 of the radius of the enhanced stirring barrel.

[0009] Preferably, longitudinal stirring plates are symmetrically provided on both sides of the powerful stirring shaft, and the longitudinal stirring plates are arranged parallel to the powerful stirring shaft and have the same length as the powerful stirring shaft.

[0010] Preferably, a plurality of spoilers are circumferentially distributed on the barrel wall of the enhanced stirring barrel.

[0011] Preferably, the injection intensity of the upward aeration port gradually increases from top to bottom along the height direction of the enrichment and stratification barrel.

[0012] Preferably, a central support shaft is provided in the enrichment and stratification barrel, and the plurality of groups of upward aeration arrays are upward aeration pipes which are coaxially arranged in the enrichment and stratification barrel from top to bottom along the central support shaft through radial support rods.

[0013] Preferably, an umbrella-shaped dispersion plate is provided at the top end of the central support shaft of the enrichment and stratification barrel, and the ore inlet of the enrichment and stratification barrel is arranged vertically downward relative to the umbrella-shaped dispersion plate.

[0014] Preferably, an overflow groove is arranged around the outer side of the upper end port of the enrichment and stratification barrel, and the small specific gravity overflow port is connected to the overflow groove; the bottom of the overflow groove is inclined toward one side of the enrichment and stratification barrel, and the small specific gravity overflow port is arranged at the lowest position of the bottom of the overflow groove.

[0015] Preferably, the inner diameter of the enrichment and stratification barrel gradually decreases from top to bottom, and the inner wall of the enrichment and stratification barrel is radially inclined inward; a gathering hopper is provided at the lower end of the enrichment and stratification barrel, the radial inclination angle of the gathering hopper is greater than the radial inclination angle of the inner wall of the enrichment and stratification barrel, and the high specific gravity discharge outlet is connected to the lowest point of the gathering hopper.

[0016] The beneficial effects of the utility model are:

[0017] The utility model discloses a micro-fine low-grade tailings pre-enrichment and stratification device, which provides enhanced power for a powerful stirring shaft through a powerful stirring motor, and the tailings are fully stirred under the joint strengthening action of the powerful stirring motor and the powerful stirring shaft, so that various components in the tailings are fully mixed and uniform, and the fully mixed tailings material enters the enrichment and stratification barrel from the powerful stirring barrel, and the bubbles overflowing from the upward aeration port in the enrichment and stratification barrel lift the slurry particles entering the enrichment and stratification barrel upward, and form stratification according to the particle size and specific gravity difference of the ore particles under the action of the multi-layer vertical rising medium flow, so that the ore particles with small specific gravity are continuously washed and floated to the upper end of the enrichment and stratification barrel by the buoyancy of water and the drag force of the ore pulp, and are discharged from the overflow port with small specific gravity; the ore particles with large specific gravity continuously sink due to their own gravity overcoming the buoyancy of water and the drag force of the ore pulp, and are discharged from the discharge port with large specific gravity at the lower end of the enrichment and stratification barrel, thereby realizing the ore material sorting of micro-fine particle level of the ore pulp.

[0018] In order to ensure the stability of the powerful stirring shaft under enhanced power, the utility model positions the lower end bearing of the powerful stirring shaft at the bottom of the enhanced stirring barrel, fixes the upper and lower ends of the powerful stirring shaft, and ensures the stability of the powerful stirring shaft under increased power.

[0019] The utility model arranges an enrichment and stratification barrel so that the inner diameter thereof gradually decreases from top to bottom, and the inner wall of the enrichment and stratification barrel is arranged to be inclined radially inward to form a smooth inclined surface, so that the high-specific-density ore particles can be rapidly settled along the inner wall of the enrichment and stratification barrel by the boycott and finger effects, thereby improving the separation speed of the high-specific-density ore particles and the low-specific-density ore particles in the enrichment and stratification barrel.

[0020] The utility model arranges an umbrella-shaped dispersion plate below the ore inlet of the enrichment and stratification barrel, so that the ore pulp entering the enrichment and stratification barrel from the ore inlet of the enrichment and stratification barrel impacts the umbrella-shaped dispersion plate, and is dispersed in all directions in the enrichment and stratification barrel under the obstruction of the umbrella-shaped dispersion plate, thereby improving the dispersion efficiency of the high-specific-density ore particles and the low-specific-density ore particles in the enrichment and stratification barrel, and at the same time can also reduce the speed of the ore pulp, so as to avoid the ore pulp flow rate being too high and being directly discharged from the high-specific-density discharge port at the lower end of the enrichment and stratification barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the device for pre-enrichment and stratification of fine-grained low-grade tailings described in an embodiment of the utility model.

[0022] Figure 2 It is a schematic structural diagram of the enhanced stirring barrel in the fine-grained low-grade tailings pre-enrichment and stratification device described in an embodiment of the utility model.

[0023] Figure 3 It is a schematic structural diagram of the enrichment and stratification barrel in the fine-grained low-grade tailings pre-enrichment and stratification device described in an embodiment of the utility model.

[0024] The markings of the components in the accompanying drawings are as follows:

[0025] 1. Enhanced mixing barrel; 2. Enrichment and stratification barrel; 11. Powerful mixing motor; 12. Powerful mixing shaft; 121. Horizontal mixing impeller; 122. Longitudinal mixing plate; 123. Spoiler; 3. Horizontal centrifugal pump; 201. Low specific gravity overflow port; 202. High specific gravity discharge port; 21. Overflow trough; 22. Aggregation hopper; 23. Central support shaft; 231. Base; 232. Ore falling window; 233. Radial support rod; 24. Upward aeration pipe; 25. Ultrafine bubble generator; 26. Umbrella-shaped dispersion plate; 203. Ore inlet. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0027] The utility model provides a device for pre-enrichment and stratification of fine-grained low-grade tailings, such as Figures 1 to 3 As shown, it includes an enhanced stirring barrel 1 and an enrichment and stratification barrel 2, the material output port of the enhanced stirring barrel 1 is connected to the material input port of the enrichment and stratification barrel 2, wherein the enhanced stirring barrel 1 is provided with a strong stirring motor 11 and a strong stirring shaft 12, the power output shaft of the strong stirring motor 11 is connected to the strong stirring shaft 12, the strong stirring shaft 12 is coaxially arranged in the enhanced stirring barrel 1, and its lower end bearing is positioned at the bottom of the enhanced stirring barrel 1; the upper end of the enrichment and stratification barrel 2 is provided with a small specific gravity overflow port 201, and the lower end is provided with a large specific gravity discharge port 202, and an upward component is provided in the barrel, and the upward component includes a plurality of upward aeration array groups distributed from top to bottom along the height direction of the enrichment and stratification barrel 2, and each group of upward aeration array groups includes a plurality of upward aeration ports arranged around the enrichment and stratification barrel 2 and with the spraying direction upward.

[0028] The powerful stirring motor 11 provides enhanced power for the powerful stirring shaft 12. To ensure the stability of the powerful stirring shaft 12 under the enhanced power, the lower end bearing of the powerful stirring shaft 12 is positioned at the bottom of the enhanced stirring barrel 1, and the upper and lower ends of the powerful stirring shaft 12 are fixed to ensure the stability of the powerful stirring shaft 12 under the increased power; the tailings are fully stirred under the joint enhanced action of the powerful stirring motor 11 and the powerful stirring shaft 12, so that the various components in the tailings are fully mixed and uniform, and the fully mixed tailings material enters the enrichment and stratification barrel 2 from the powerful stirring barrel The bubbles overflowing from the upward aeration port in the enrichment and stratification barrel 2 lift the slurry particles entering the enrichment and stratification barrel 2 upward, and form stratification according to the particle size and specific gravity difference of the ore particles under the action of the multi-layer vertical rising medium flow, so that the ore particles with small specific gravity are continuously washed and floated to the upper end of the enrichment and stratification barrel 2 by the buoyancy of water and the drag force of the ore pulp, and are discharged from the overflow port 201 with small specific gravity; the ore particles with large specific gravity continue to sink due to their own gravity overcoming the buoyancy of water and the drag force of the ore pulp, and are discharged from the discharge port 202 with large specific gravity at the lower end of the enrichment and stratification barrel 2; thereby realizing the fine-grained mineral sorting of the ore pulp.

[0029] like Figure 2 As shown, the strong stirring shaft 12 is provided with multiple layers of transverse stirring impellers 121 along the longitudinal direction of its shaft body, which enhances the stirring power of the strong stirring shaft 12 in the longitudinal direction, and ensures that the tailings materials at all heights in the strong stirring barrel can be fully stirred. Preferably, the lateral extension radius of the transverse stirring impeller 121 is 2 / 3 of the radius of the enhanced stirring barrel 1; at the same time, longitudinal stirring plates 122 are symmetrically arranged on both sides of the strong stirring shaft 12, and the longitudinal stirring plates 122 are arranged parallel to the strong stirring shaft 12 and are equal in length to the strong stirring shaft 12, thereby increasing the effective area of ​​the strong stirring shaft 12 and enhancing the stirring effect of the strong stirring shaft 12. In addition, in order to further enhance the stirring power of the strong stirring barrel, a plurality of spoilers 123 are circumferentially distributed on the barrel wall of the enhanced stirring barrel 1 to disrupt the flow path of the tailings materials in the stirring barrel and increase the mixing effect of the tailings materials; preferably, the spoilers 123 are detachably arranged on the barrel wall of the enhanced stirring barrel 1 through snap-fit ​​components.

[0030] The material output port of the enhanced mixing barrel 1 is at the bottom of the mixing barrel, and the material input port of the enrichment and stratification barrel 2 is at the upper end of the enrichment and stratification barrel 2. The material output port of the enhanced mixing barrel 1 is connected to the material input port of the enrichment and stratification barrel 2 through a material transmission pipeline; wherein, a horizontal centrifugal pump 3 is also provided on the material transmission path between the material output port of the enhanced mixing barrel 1 and the material input port of the enrichment and stratification barrel 2, and the horizontal centrifugal pump 3 pumps the tailings material of the enhanced mixing barrel 1 into the enrichment and stratification barrel 2.

[0031] like Figure 3As shown, the inner diameter of the enrichment and stratification barrel 2 gradually decreases from top to bottom, and the inner wall of the enrichment and stratification barrel 2 is radially inclined inward to form a smooth inclined surface. The boycott and finger effects can realize the rapid sedimentation of high-density ore particles along the inner wall of the enrichment and stratification barrel 2, so as to improve the separation speed of high-density ore particles and low-density ore particles in the enrichment and stratification barrel 2. An overflow trough 21 is arranged around the outer side of the upper end port of the enrichment and stratification barrel 2, and the low-density overflow port 201 is connected to the overflow trough 21; preferably, the bottom of the overflow trough 21 is inclined toward one side of the enrichment and stratification barrel 2, and the low-density overflow port 201 is arranged at the lowest position of the bottom of the overflow trough 21. A gathering hopper 22 is arranged at the lower end of the enrichment and stratification barrel 2, and the radial inclination angle of the gathering hopper 22 is greater than the radial inclination angle of the inner wall of the enrichment and stratification barrel 2, and the high-density discharge port 202 is connected to the lowest point of the gathering hopper 22.

[0032] A central support shaft 23 is provided in the middle of the enrichment and stratification barrel 2. The central support shaft 23 is coaxially supported and arranged in the enrichment and stratification barrel 2 through a base 231; the base 231 is arranged above the gathering hopper 22, so that the ore material can smoothly fall into the gathering hopper 22 and be discharged from the high specific gravity discharge port 202. Figure 3 As shown, a plurality of tailings dropping windows 232 are provided on the base 231 , and the ore material drops into the gathering hopper 22 through the tailings dropping windows 232 and is discharged from the high specific gravity discharge port 202 .

[0033] The plurality of upward aeration arrays are upward aeration pipes 24 coaxially arranged in the enrichment and stratification barrel 2 from top to bottom along the central support shaft 23 through radial support rods 233, and the upward aeration pipes 24 are provided with a plurality of upward aeration ports with the spray direction facing upward, and the upward aeration pipes 24 at each height are respectively connected to an ultra-fine bubble generator 25. The bubbles overflowing from the upward aeration ports can provide upward power for the slurry particles in the enrichment and stratification barrel 2, and the water retention time is long, so that the small specific gravity ore particles are raised to the upper end of the enrichment and stratification barrel 2 under the action of the upward backwash water and discharged from the small specific gravity overflow port 201, thereby reducing the lower limit of the separation particle size of high specific gravity minerals, strengthening the difference in mineral specific gravity, and realizing the separation of fine-grained ore materials.

[0034] like Figure 3As shown, the diameters of the multiple groups of upward aeration pipes 24 around the central support shaft 23 of the enrichment and stratification barrel 2 gradually decrease from top to bottom; that is, since the diameter of the upper part of the enrichment and stratification barrel 2 is relatively large, the first group of upward aeration arrays arranged at the upper part of the enrichment and stratification barrel 2 includes two upward aeration pipes 24 inside and outside, the second group of upward aeration arrays arranged at the middle part of the enrichment and stratification barrel 2 and the third group of upward aeration arrays arranged at the lower part of the enrichment and stratification barrel 2 each have only one upward aeration pipe 24, and the diameter of the upward aeration pipe 24 of the second group of upward aeration arrays around the central support shaft 23 of the enrichment and stratification barrel 2 is larger than the diameter of the upward aeration pipe 24 of the third group of upward aeration arrays around the central support shaft 23 of the enrichment and stratification barrel 2. Preferably, the injection intensity of the upward aeration port gradually increases from top to bottom along the height direction of the enrichment and stratification barrel 2.

[0035] The ore pulp enters the enrichment and stratification barrel 2 from the ore inlet 203 of the enrichment and stratification barrel 2. In order to improve the dispersion effect of the high-density ore particles and the low-density ore particles in the ore pulp, Figure 3 As shown, an umbrella-shaped dispersion plate 26 is provided at the top of the central support shaft 23 of the enrichment and stratification barrel 2, and the ore inlet 203 of the enrichment and stratification barrel 2 is arranged vertically downward relative to the umbrella-shaped dispersion plate 26; the ore slurry entering the enrichment and stratification barrel 2 from the ore inlet 203 of the enrichment and stratification barrel 2 impacts the umbrella-shaped dispersion plate 26, and is dispersed in all directions in the enrichment and stratification barrel 2 under the obstruction of the umbrella-shaped dispersion plate 26, thereby improving the dispersion efficiency of the high-density ore particles and the low-density ore particles in the enrichment and stratification barrel 2, and at the same time, the ore slurry can be decelerated to avoid the ore slurry flow rate being too high and being directly discharged from the high-density discharge port 202 at the lower end of the enrichment and stratification barrel 2.

[0036] When the ore pulp falls from the ore inlet 203, it is blocked by the umbrella-shaped dispersion plate 26 and then falls into the enrichment and stratification barrel 2 in a dispersed manner. A fluidized bed is formed in the enrichment and stratification barrel 2 under the action of the upward aeration pipe 24. According to the difference in specific gravity and particle size of the mineral particles, the sedimentation speeds of the high-density and low-density mineral particles in the enrichment and stratification barrel 2 are also different. Under the action of the oblique inner wall of the enrichment and stratification barrel 2, the sedimentation speed of the mineral particles will be accelerated, among which the high-density mineral particles will sink first, and the bed density of the separation fluidized bed will gradually increase from top to bottom. Correspondingly, the injection intensity of the upward aeration port will gradually increase from top to bottom along the height direction of the enrichment and stratification barrel 2; the low-density mineral particles at the lower layer move upward through the strong backwash water, the concentration of the upper fluidized bed is relatively low, and the drag effect such as particle friction is small. The low-density mineral particles rise to the upper end of the enrichment and stratification barrel 2 under the action of multiple backwash waters and are discharged from the low-density overflow port 201. The high-density ore particles quickly settle along the inner wall of the enrichment and stratification barrel 2 to the lower end of the enrichment and stratification barrel 2. The bed concentration at the lower end of the enrichment and stratification barrel 2 is relatively high, and the drag effects such as particle friction are relatively large. The high-density ore particles continue to sink due to their own gravity overcoming the buoyancy of water and the drag of the slurry, and are discharged from the high-density discharge port 202 at the lower end of the enrichment and stratification barrel 2.

[0037] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for pre-enrichment and stratification of fine-grained low-grade tailings, characterized in that: It comprises an enhanced stirring barrel and an enrichment and stratification barrel, wherein the material output port of the enhanced stirring barrel is connected to the material input port of the enrichment and stratification barrel, wherein the enhanced stirring barrel is provided with a strong stirring motor and a strong stirring shaft, the power output shaft of the strong stirring motor is connected to the strong stirring shaft, the strong stirring shaft is coaxially arranged in the enhanced stirring barrel, and the lower end bearing thereof is positioned at the barrel bottom of the enhanced stirring barrel; the upper end of the enrichment and stratification barrel is provided with a small specific gravity overflow port, and the lower end is provided with a large specific gravity discharge port, and an upward component is provided in the barrel, and the upward component comprises a plurality of upward aeration array groups distributed from top to bottom along the height direction of the enrichment and stratification barrel, and each group of upward aeration array groups comprises a plurality of upward aeration ports which are arranged around the enrichment and stratification barrel and whose spraying direction is upward.

2. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 1 is characterized in that: The strong stirring shaft is provided with multiple layers of transverse stirring impellers distributed along the longitudinal direction of the shaft body.

3. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 2 is characterized in that: The lateral extension radius of the lateral stirring impeller is 2 / 3 of the radius of the enhanced stirring barrel.

4. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 1 is characterized in that: Longitudinal stirring plates are symmetrically arranged on both sides of the powerful stirring shaft. The longitudinal stirring plates are arranged parallel to the powerful stirring shaft and have the same length as the powerful stirring shaft.

5. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 1 is characterized in that: The barrel wall of the enhanced stirring barrel is provided with a plurality of spoilers distributed circumferentially.

6. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 1 is characterized in that: The jet intensity of the upward aeration port is gradually increased from top to bottom along the height direction of the enrichment and stratification barrel.

7. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 1 is characterized in that: A central support shaft is arranged in the enrichment and stratification barrel, and the plurality of upward aeration arrays are upward aeration pipes which are coaxially arranged in the enrichment and stratification barrel from top to bottom along the central support shaft through radial support rods.

8. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 7, characterized in that: An umbrella-shaped dispersion plate is arranged at the top end of the central support shaft of the enrichment and stratification barrel, and an ore inlet of the enrichment and stratification barrel is arranged vertically downward relative to the umbrella-shaped dispersion plate.

9. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 1, characterized in that: An overflow trough is arranged around the outer side of the upper end port of the enrichment and stratification barrel, and the small specific gravity overflow port is connected to the overflow trough; the bottom of the overflow trough is inclined toward one side of the enrichment and stratification barrel, and the small specific gravity overflow port is arranged at the lowest position of the bottom of the overflow trough.

10. The micro-particle low-grade tailings pre-enrichment and stratification device according to claim 1, characterized in that: The inner diameter of the enrichment and stratification barrel gradually decreases from top to bottom, and the inner wall of the enrichment and stratification barrel is radially inclined inward; a gathering hopper is provided at the lower end of the enrichment and stratification barrel, and the radial inclination angle of the gathering hopper is greater than the radial inclination angle of the inner wall of the enrichment and stratification barrel, and the high specific gravity discharge port is connected to the lowest point of the gathering hopper.

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