Centrifugal machine for realizing double separation of slag separation and dehydration of ore washing slurry

Abstract

The centrifugal machine comprises a shell, a first bearing and a second bearing are connected with a differential system respectively, the differential system is installed in the top of the shell, the second bearing is installed in the first bearing, the bottom end of a rotating shaft movably penetrates through a bearing support, the differential system and the second bearing in sequence to be connected with a material distributing mechanism, and the material distributing mechanism is connected with the shell. The first-layer rotary drum is movably installed between the first bearing and the bottom of the shell, the second-layer rotary drum is located in the first-layer rotary drum, the material distributing mechanism is located in the second-layer rotary drum, the material distributing mechanism and the second-layer rotary drum are movably installed between the second bearing and the bottom of the shell, and one end of the feeding pipe penetrates through the bottom of the shell and extends into the material distributing mechanism. A liquid phase outlet, a first solid phase outlet and a second solid phase outlet are formed in the bottom of the shell, the liquid phase outlet is formed between the first-layer rotary drum and the shell, the first solid phase outlet is formed between the first-layer rotary drum and the second-layer rotary drum, and the second solid phase outlet is formed between the second-layer rotary drum and the second column casing. According to the utility model, the separation of slag, slime and water in the ore washing slurry can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of washing ore slurry slag separation and dehydration, and particularly relates to a centrifuge for realizing double separation of washing ore slurry slag separation and dehydration. Background Technique

[0002] Washing ore slurry is a special suspension produced during the washing ore process, mainly composed of slag, slime and water. In the process of mining production, washing ore is an important link, aiming to remove soil, impurities, etc. from the ore through washing to improve the grade and quality of the ore. However, a large amount of washing ore slurry will be generated in this process, which contains a large amount of slag, slime and moisture, bringing challenges to environmental protection and resource recycling. The treatment and recycling of washing ore slurry have always been a research hotspot in the mining field. Due to the small particle size of the solid particles in the washing ore slurry and the small density difference, the dehydration treatment is relatively complex and difficult. Traditional treatment methods often have problems such as poor dehydration effect and low treatment efficiency, and it is difficult to meet the requirements of high efficiency and environmental protection in mining production. Therefore, it is of great significance to research and develop efficient washing ore slurry treatment technologies and equipment. This can not only reduce environmental pollution, improve the resource recycling rate, but also reduce the cost of mining production and promote the sustainable development of the mining industry.

[0003] At present, the treatment technologies for washing ore slurry mainly include steps such as centrifuge dehydration, sedimentation in sedimentation tanks, filtration and purification. The centrifuge dehydration technology is based on the semi-dry discharge technology. By using external force, the washing ore slurry is dehydrated. That is, a certain concentration of dehydration agent is added to the washing ore slurry conveying pipeline, and after the dehydrating agent is fully mixed with the washing ore slurry, it enters the centrifuge cylinder. The washing ore slurry and the agent mixture are subjected to solid-liquid separation under the action of the centrifugal force generated by the high-speed rotation of the centrifuge. The solid slag is led to the solid slag yard by the centrifuge auxiliary equipment, and the liquid phase is led to the clear liquid pool by the centrifuge auxiliary equipment, so as to achieve the purpose of dehydrating the washing ore slurry.

[0004] At present, there are few types of centrifuges used for dehydrating washing ore slurry, which can only separate the washing ore slurry from water, and the dehydration effect is poor, and it is impossible to achieve the effect of separating slag, slime and water at the same time. Due to the small particle size of the washing ore slurry, the pore size of the filter medium in the currently used centrifuges is relatively large, resulting in unsatisfactory dehydration effect of the washing ore slurry, low dehydration efficiency and high moisture content of the obtained slime, and the separated filtrate is not clear enough. The internal structure of the centrifuge is complex, and it is easy to wear under long-term uninterrupted high-speed operation, and it needs to be maintained regularly and parts need to be replaced, resulting in high maintenance costs. Content of the Utility Model

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a centrifuge that realizes the dual separation of slag and dehydration of washing ore slurry, aiming to achieve the dual separation of slag and dehydration of washing ore slurry, improve the dehydration efficiency of washing ore slurry, obtain slag and ore mud with a lower moisture content, improve the clarity of the filtrate, and at the same time facilitate the maintenance and cleaning of the machine.

[0006] In order to achieve the above object, the specific scheme of the utility model is as follows:

[0007] A centrifuge that realizes the dual separation of slag and dehydration of washing ore slurry includes a housing, a feed pipe, a rotating shaft, a bearing support installed outside the top of the housing, and a first layer of drum, a first bearing, a second bearing, a second layer of drum, a material distribution mechanism, and a differential system installed inside the housing. The first bearing and the second bearing are respectively connected to the differential system. The differential system is installed at the top of the housing, and the second bearing is movably installed inside the first bearing. The bottom end of the rotating shaft sequentially passes through the bearing support, the differential system, and the second bearing and is connected to the material distribution mechanism. The first layer of drum is movably connected between the first bearing and the bottom of the housing. The second layer of drum is located inside the first layer of drum. The material distribution mechanism is located inside the second layer of drum. The material distribution mechanism and the second layer of drum are respectively movably connected between the second bearing and the bottom of the housing. One end of the feed pipe passes through the bottom of the housing and extends into the material distribution mechanism. The bottom of the housing is provided with a liquid phase outlet, a first solid phase outlet, and a second solid phase outlet. The liquid phase outlet is arranged between the first layer of drum and the housing. The first solid phase outlet is arranged between the first layer of drum and the second layer of drum. The second solid phase outlet is arranged between the second layer of drum and the second cylinder.

[0008] Furthermore, the first bearing is composed of a trapezoidal ring body and an annular base connected. The bottom surface of the annular base is respectively provided with a guide rail and an annular slide rail one for movably connecting the first layer of drum from the inside to the outside. The second bearing is composed of an annular column and an annular disc connected to form an inverted T shape. The bottom surface of the annular disc is respectively provided with an annular groove for movably connecting the material distribution mechanism and an annular slide rail two for movably connecting the second layer of drum from the inside to the outside. And a plurality of sliders engaged with the guide rail are arrayed in the circumferential direction at the edge of the annular disc. The bottom of the housing is respectively provided with an annular slide rail three corresponding to the annular slide rail one and an annular slide rail four corresponding to the annular slide rail two. The two ends of the first layer of drum are respectively movably connected to the annular slide rail one and the annular slide rail three. The two ends of the second layer of drum are respectively movably connected to the annular slide rail two and the annular slide rail four.

[0009] Furthermore, a first scraping and discharging mechanism is arranged between the first layer of drum and the second layer of drum. The two ends of the first scraping and discharging mechanism are respectively installed on the second bearing and the bottom of the housing. A second scraping and discharging mechanism is arranged between the material distribution mechanism and the second layer of drum. The two ends of the second scraping and discharging mechanism are respectively installed on the material distribution mechanism.

[0010] Further, both the first scraper discharging mechanism and the second scraper discharging mechanism respectively include a scraper, a metal fixing member, a telescopic pipe A and a telescopic pipe B. The metal fixing member is L-shaped. Two ends of the scraper are respectively connected to one ends of the telescopic pipe A and the telescopic pipe B. The other ends of the telescopic pipe A and the telescopic pipe B are respectively connected to the metal fixing member. The metal fixing members at both ends of the first scraper discharging mechanism are respectively installed on the second bearing and the bottom of the housing. The metal fixing members at both ends of the second scraper discharging mechanism are respectively installed on the material distributing mechanism. A first brush is provided on the metal fixing member at the bottom of the first scraper discharging mechanism, and a second brush is provided on the metal fixing member at the bottom of the second scraper discharging mechanism.

[0011] Further, the material distributing mechanism includes a first column cylinder, a diverter, a material distributing cylinder and a second column cylinder. The material distributing cylinder and the diverter are respectively installed at the bottom of the first column cylinder, and the diverter is located inside the material distributing cylinder. The second column cylinder is connected to the bottom end of the material distributing cylinder. The material distributing cylinder is tubular, and multiple rows of material distribution holes are provided in the circumferential direction.

[0012] Further, the diverter is in an inverted bowl shape, and the cross-section of the inverted bowl shape is trapezoidal.

[0013] Further, support feet are also provided on the outer side of the bottom of the housing.

[0014] Further, a flexible filter medium is provided on the first layer of the rotating drum. According to the particle size distribution of the ore washing slurry under different working conditions, filter media with different interception particle sizes are selected.

[0015] Further, two liquid phase outlets, two first solid phase outlets and two second solid phase outlets are respectively provided. The two liquid phase outlets are symmetrically arranged on both sides of the bottom of the housing and are located between the first layer of the rotating drum and the housing. The two first solid phase outlets are symmetrically arranged on both sides of the bottom of the housing and are located between the first layer of the rotating drum and the second layer of the rotating drum. The two second solid phase outlets are symmetrically arranged on both sides of the bottom of the housing and are located between the second layer of the rotating drum and the second column cylinder.

[0016] Advantages of the present utility model

[0017] 1. The centrifuge of the present utility model realizes the dual separation of slag separation and dehydration of ore washing slurry. By selecting the corresponding filter medium combination according to the particle size distribution of the ore washing slurry under the working conditions to be processed, it is convenient to improve the interception efficiency of the filter medium for the ore washing slurry, reduce the moisture content of the ore washing slurry, and improve the separation effect and filtrate clarity of the device.

[0018] 2. According to the ore washing slurry under different working conditions, the utility model extends the scraper to different distances from the filter medium, so that the filter cake intercepted on the filter medium maintains a certain thickness, which can not only allow water to pass through the filter cake, but also intercept the ore washing slurry with finer particle size. By tilting the scraper to different angles, the filter cake accumulated on the filter medium after filtration can be scraped off, and the scraped slag and mud are sent to the solid phase outlet through the rotation of the brush, which is convenient to improve the interception efficiency of the filter medium for the ore washing slurry, reduce the moisture content of the ore washing slurry, and improve the separation effect and filtrate clarity of the device.

[0019] 3. By controlling the tilt angle of the scraper, the utility model is beneficial to reducing the wear of the scraper on the filter medium. The scraper is replaceable, which is beneficial to reducing the maintenance cost. It also has the characteristics of high practicability, easy cleaning and maintenance. Brief Description of the Drawings

[0020] Figure 1 Schematic cross-sectional structure diagram of a centrifuge for realizing the dual separation of slag separation and dehydration of ore washing slurry in the utility model.

[0021] Figure 2 For Figure 1 Stereoscopic sectional view.

[0022] Figure 3 For Figure 1 Partial structure enlarged view in

[0023] Figure 4 For Figure 1 Schematic diagram of the outer structure of

[0024] Figure 5 For Figure 1 Schematic diagram of the structure of the scraper discharging mechanism of

[0025] Figure 6 For Figure 1 Schematic diagram of the structure of the material distributing mechanism in

[0026] Figure 7 For Figure 1 Schematic diagram of the structure at the bottom of the housing in

[0027] Figure 8 For Figure 1 Exploded schematic diagram of the front view structure of bearing one and bearing two in

[0028] Figure 9 For Figure 1 Exploded schematic diagram of the top view structure of bearing one and bearing two in

[0029] Figure 10 For Figure 1 Schematic diagram of the connection structure of bearing two and bearing one in

[0030] In the figure:

[0031] 1. Housing; 2. First - layer drum; 3. Differential system; 4. Second - layer drum; 5. Liquid - phase outlet; 6. First solid - phase outlet; 7. Feeding cylinder; 8. Feed pipe; 9. First bearing; 10. Flexible filter medium; 11. Second solid - phase outlet; 12. Annular groove; 13. First annular slide rail; 14. Second annular slide rail; 15. Shunt; 16. Second bearing; 17. Metal fixture; 18. Telescopic pipe A; 19. Telescopic pipe B; 20. First brush; 21. Scraper; 22. Second brush; 23. Support foot; 24. First cylinder; 25. Second cylinder; 26. Rotating shaft; 27. Bearing support; 28. Guide rail; 29. Slide block; 30. Third annular slide rail; 31. Fourth annular slide rail. Detailed implementation mode

[0032] The present utility model will be further explained and described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the specific embodiments do not limit the scope of rights of the present utility model.

[0033] As Figures 1 to 10 shown, the centrifuge for realizing the dual separation of washing ore mud slag separation and dehydration in this specific embodiment includes a housing 1, a feed pipe 8, a rotating shaft 26, a bearing support 27 installed outside the top of the housing 1, a first scraper unloading mechanism, a second scraper unloading mechanism, and a first - layer drum 2, a first bearing 9, a second bearing 16, a second - layer drum 4, a feeding mechanism, and a differential system 3 installed inside the housing 1.

[0034] Bearing One 9 and Bearing Two 16 are respectively connected to the differential system 3. The differential system 3 is installed inside the top of the housing 1, and Bearing Two 16 is movably installed inside Bearing One 9. The first-layer drum 2 is movably connected between Bearing One 9 and the bottom of the housing 1. Specifically, Bearing One 9 is composed of a trapezoidal annular body and an annular base connected. The bottom surface of the annular base is respectively provided with a guide rail 28 and an annular slide rail one 13 for movably connecting the first-layer drum 2 from the inside to the outside. Bearing Two 16 is composed of an annular column and an annular disc connected to form an inverted T shape. The bottom surface of the annular disc is respectively provided with an annular groove 12 for movably connecting the material distribution mechanism and an annular slide rail two 14 for movably connecting the second-layer drum 4 from the inside to the outside. And a plurality of sliders 29 engaged with the guide rail 28 are arrayed in the circumferential direction at the edge of the annular disc, so that Bearing Two 16 is engaged with the guide rail 28 of Bearing One 9 through the sliders 29 to realize the rotation of Bearing Two 16 and Bearing One 9 at different speeds. The bottom of the housing 1 is respectively provided with an annular slide rail three 30 corresponding to the annular slide rail one 13 and an annular slide rail four 31 corresponding to the annular slide rail two 14, so that both ends of the first-layer drum 2 are respectively clamped on the annular slide rail one 13 and the annular slide rail three 30, and both ends of the second-layer drum 4 are respectively clamped on the annular slide rail two 14 and the annular slide rail four 31. When the rotation of Bearing One 9 is controlled by the differential system 3, Bearing One 9 can drive the first-layer drum 2 to rotate between the annular slide rail one 13 and the annular slide rail three 30, and Bearing Two 16 can drive the second-layer drum 4 to rotate between the annular slide rail two 14 and the annular slide rail four 31.

[0035] A flexible filter medium 10 is provided on the first-layer drum 2. The flexible filter medium 10 refers to a woven filter cloth. The filter cloth is divided into various types according to the yarn type and weaving method. The filter cloth that meets the requirements is selected according to the minimum particle size of the filter mud of the ore washing slurry. The flexible filter medium 10 selects filter media with different interception particle sizes according to the different particle size distributions of the ore washing slurry under different working conditions, so as to improve the interception efficiency of the filter medium for the ore washing slurry, reduce the moisture content of the ore washing slurry, and improve the separation effect and filtrate clarity of the device. The flexible filter medium in this embodiment can select a polypropylene double-layer monofilament filter cloth.

[0036] As Figure 5 shown, a first scraper unloading mechanism is provided between the first-layer drum 2 and the second-layer drum 4, and a second scraper unloading mechanism is provided between the material distribution mechanism and the second-layer drum 4.

[0037] Specifically, both the first scraper unloading mechanism and the second scraper unloading mechanism respectively include a scraper 21, a metal fixing member 17, a telescopic tube A 18 and a telescopic tube B 19. The metal fixing member 17 is L-shaped. Both ends of the scraper 21 are respectively connected to one end of the telescopic tube A 18 and the telescopic tube B 19, and the other ends of the two telescopic tubes A 18 and the telescopic tube B 19 are respectively connected to the metal fixing member 17.

[0038] Fix the metal fixing parts 17 at both ends of the first scraper discharging mechanism on the annular slide rail two 14 of the second bearing 16 and the annular slide rail four 31 at the bottom of the housing 1 respectively, and it is located between the first layer of drum 2 and the second layer of drum 4. The purpose is to make the scraper 21 of the first scraper discharging mechanism scrape off the ore sludge attached to the first layer of drum 2. A first brush 20 is provided on the metal fixing part 17 at the bottom of the first scraper discharging mechanism, and the purpose is to sweep the scraped ore sludge to the first solid phase outlet 6. The metal fixing part 17, the telescopic pipe A 18 and the telescopic pipe B 19 are all made of stainless steel.

[0039] The material distributing mechanism includes a first column cylinder 24, a diverter 15, a material distributing cylinder 7 and a second column cylinder 25. The material distributing cylinder 7 and the diverter 15 are respectively installed at the bottom of the first column cylinder 24, and the diverter 15 is located inside the material distributing cylinder 7. The diverter 15 is in the shape of an inverted bowl, and the cross-section of the inverted bowl is trapezoidal. The function of the diverter 32 is to flush the ore washing slurry from the feed pipe 8 onto the diverter 32 and evenly distribute it onto the rotating material distributing cylinder 7 along the diverter 32, so that the ore washing slurry is more evenly distributed. The second column cylinder 25 is connected to the bottom end of the material distributing cylinder 7. The material distributing cylinder 7 is tubular, and multiple rows of material distributing holes are provided in the circumferential direction.

[0040] The function of the material distributing mechanism is to evenly distribute the ore washing slurry sent by the feed pipe 8 through the rotating diverter 15 inside the material distributing cylinder 7, and then throw the ore washing slurry into the second layer of drum 4 through the material distributing ports of the material distributing cylinder 7.

[0041] Install the metal fixing parts 17 at both ends of the two second scraper discharging mechanisms on the first column cylinder 24 and the second column cylinder 25 respectively, and it is located between the material distributing mechanism and the second layer of drum 4. The purpose is to make the scraper 21 of the second scraper discharging mechanism scrape off the ore slag attached to the second layer of drum 4. A second brush 22 is provided on the metal fixing part 17 at the bottom of the second scraper discharging mechanism.

[0042] The function of the material distributing cylinder 7 is to evenly throw the ore washing slurry onto the second layer of drum 4. The ore washing slurry is thrown towards the inner wall of the second layer of drum 4 rotating at a certain speed. Under the action of centrifugal force, the ore sludge and water with small particle size will pass through the holes on the second layer of drum 4 and be thrown onto the first layer of drum 10, and the ore slag with larger particle size is intercepted on the inner wall of the second layer of drum 4. Control the scraper 21 of the second scraper discharging mechanism to scrape off the ore slag and discharge it through the second solid phase outlet 11. Such a design can effectively realize the separation and discharge of the ore slag in the ore washing slurry. The material distributing cylinder 7 is made of the same material as the first layer of drum 2 and the second layer of drum 4, which is a perforated stainless steel hollow cylinder. Parameters such as the diameter and hole size of the hollow cylinder need to be made by relevant factories according to engineering requirements and relevant specifications.

[0043] The bottom end of the rotating shaft 26 sequentially passes through the bearing support 27, the differential system 3, and the second bearing 16 to connect the material distribution mechanism. The material distribution mechanism is located inside the second-layer drum 4, and annular grooves 15 are respectively provided corresponding to the bottom of the second bearing 16 and the bottom of the housing 1 between the two scraper discharging mechanisms. The material distribution mechanism is movably connected between the second bearing 16 and the bottom of the housing 1 through the two annular grooves 15, so that when the rotating shaft 26 rotates, it can drive the material distribution mechanism to rotate in the two annular grooves 15.

[0044] The first-layer drum 2 and the second-layer drum 4 are respectively controlled by the differential system 3, and the material distribution mechanism is controlled by the rotating shaft 26, so that the first-layer drum 2, the second-layer drum 4 and the material distribution mechanism have different rotation speeds.

[0045] Both the first-layer drum 2 and the second-layer drum 4 can be purchased on the market. In this embodiment, the first-layer drum 2 and the second-layer drum 4 with small holes on the market are selected. Both the first-layer drum 2 and the second-layer drum 4 are made of stainless steel, and the materials can be selected from 321 / 304 / 316 / 317 titanium. To prevent wear, hard alloy can be sprayed or alloy tiles can be added, all depending on engineering requirements. The first-layer drum 2 and the second-layer drum 4 can be customized with different pore diameters according to different working conditions to meet engineering requirements.

[0046] The function of the second-layer drum 4 is to intercept the slag with larger particle sizes inside, so that water and the slime with smaller particle sizes are thrown onto the first-layer drum 2 through the pores. The first-layer drum 2 is made of stainless steel and has small holes. The flexible filter medium 10 is covered on the inner surface of the first-layer drum 2 and can be rotatably connected to the second annular slide rail 14 together with the first-layer drum 2. The slime and water passing through the second-layer drum 4 reach the first-layer drum 2 under the action of centrifugal force and are intercepted by the flexible filter medium 10 on the inner surface of the first-layer drum 2, and the water can pass through the flexible filter medium 10 and the small holes of the first-layer drum 2, thus realizing the triple separation of slag, slime and water.

[0047] The differential system 3 of this embodiment can select a commercially available mechanical planetary gear transmission differential. The function of the differential system 3 is to enable the second-layer drum 4 and the first-layer drum 2 to have different rotation speeds, so that the materials are subjected to different centrifugal forces, thereby realizing the separation of slag, slime and water. The first-layer drum 2 and the second-layer drum 4 are respectively detachably installed. The differential system allows the second-layer drum 4 to rotate at different speeds, and the slag with larger particle sizes is intercepted. The first-layer drum 2 rotates at different speeds to adapt to the solid-liquid separation on the flexible filter medium 10 and realize a more refined solid-liquid separation, and the slime with smaller particle sizes is intercepted. The distribution cylinder 7 rotates at different speeds to evenly distribute the ore washing slurry and promote the separation process.

[0048] At the bottom of the housing 1, there are a liquid phase outlet 5, a first solid phase outlet 6, and a second solid phase outlet 11. The liquid phase outlet 5 is arranged between the first layer of the rotating drum 2 and the housing 1. The first solid phase outlet 6 is arranged between the first layer of the rotating drum 2 and the second layer of the rotating drum 4. The second solid phase outlet 11 is arranged between the second layer of the rotating drum 4 and the second cylinder 25. In this embodiment, there are two liquid phase outlets 5, two first solid phase outlets 6, and two second solid phase outlets 11 respectively. The two liquid phase outlets 5 are symmetrically arranged on both sides of the bottom of the housing 1 and are located between the first layer of the rotating drum 2 and the housing 1. The two first solid phase outlets 6 are symmetrically arranged on both sides of the bottom of the housing 1 and are located between the first layer of the rotating drum 2 and the second layer of the rotating drum 4. The two second solid phase outlets 11 are symmetrically arranged on both sides of the bottom of the housing 1 and are located between the second layer of the rotating drum 4 and the second cylinder 25.

[0049] The function of the liquid phase outlet 5 is to discharge the aqueous phase substances that have not been intercepted after being separated by the flexible filter medium 10 on the first layer of the rotating drum 2.

[0050] The function of the first solid phase outlet 6 is to discharge the solid particles, i.e., slime, intercepted on the first layer of the rotating drum 2 after centrifugal separation.

[0051] The function of the second solid phase outlet 11 is to discharge the solid particles, i.e., slag, intercepted on the second layer of the rotating drum 4 after centrifugal separation.

[0052] One end of the feed pipe 8 passes through the bottom of the housing 1 and extends into the material distribution mechanism.

[0053] On the outer side of the bottom of the housing 1, there are also support feet 33. The support feet 33 are used to support the housing 1 so as to facilitate the feeding of the ore washing slurry into the feed pipe 8.

[0054] The scraper 21 is made of stainless steel, carbon steel, or cemented carbide, and specifically needs to be made according to the engineering requirements. The scraper 21 extends to different distances from the flexible filter medium 10 according to the ore washing slurry under different working conditions, so as to keep the filter cake intercepted on the flexible filter medium 10 at a certain thickness, which can not only allow water to pass through the filter cake but also intercept finer slime.

[0055] The telescopic lengths of the two corresponding telescopic pipes A18 are set to be the same, and the forward telescopic distances of the two telescopic pipes A18 and the two telescopic pipes B19 can be set to be the same or different. By telescoping the same distance with the telescopic pipes A18 and the telescopic pipes B19, the forward and backward movement of the scraper 21 can be achieved. By controlling the two telescopic pipes A18 and the two telescopic pipes B19 to telescope different distances forward respectively, the rotation angle of the scraper 21 can be controlled. By tilting the scraper 21 of the first scraper discharging mechanism to different angles, the filter cake accumulated on the flexible filter medium 10 after filtration can be scraped off. The washed ore slurry scraped off is sent to the first solid phase outlet 11, the second solid phase outlet 12, the third solid phase outlet 22, and the fourth solid phase outlet 24 by the rotation of the first brush 20 and the second brush 30, which is beneficial to reducing the wear of the flexible filter medium 10 by the scraper 21 and the scraper 31, and the scraper 21 and the scraper 31 are detachable and replaceable, which is beneficial to reducing the maintenance cost.

[0056] Working principle:

[0057] First, the washed ore slurry is fed into the feed pipe 8. The washed ore slurry impacts on the diverter 15 along the feed pipe 8 and is evenly distributed onto the material distributing cylinder 7 with a certain rotational speed along the diverter 15. Under the action of centrifugal force, the washed ore slurry is thrown onto the second layer of the rotating drum 4 rotating at a certain rotational speed through the discharge port on the material distributing cylinder 7. Under the action of centrifugal force, the fine-grained ore mud and water will be thrown out through the small holes on the second layer of the rotating drum 4, while the large-grained slag cannot pass through the second layer of the rotating drum 4 and is retained on the surface of the second layer of the rotating drum 4. The washed ore slurry and water passing through the second layer of the rotating drum 4 are thrown onto the first layer of the rotating drum 2 with a certain rotational speed. The first layer of the rotating drum 2 is supported by a rigid filter medium with a larger pore diameter and a flexible filter medium with an extremely small pore diameter on the surface. The ore mud cannot pass through the flexible filter medium 10 on the first layer of the rotating drum 2 and is retained on the flexible filter medium 10. The water is thrown onto the housing 1 through the flexible filter medium 10 on the first layer of the rotating drum 2, and the water flows along the housing 1 to the bottom and flows out through the liquid phase outlet 5 at the bottom of the housing 1.

[0058] During the operation of the centrifuge, the slag intercepted on the second-layer drum 4 and the slime intercepted on the first-layer drum 2 will form a filter cake and gradually thicken. By controlling the front and rear telescopic movement of the telescopic pipes A18 and B19 of the first and second scraper discharging mechanisms by the same distance, and controlling the scrapers 21 of the first and second scraper discharging mechanisms to extend to a fixed position, the filter cake can be scraped off and a certain thickness of the filter cake can be retained. The scraped slime and slag will fall to the bottom and are respectively brushed to the first solid phase outlet 6 and the second solid phase outlet 11 by the first brush 20 and the second brush 22. When the washing ore slurry filtration is completed, by controlling the telescopic pipes A18 and B19 of the first and second scraper discharging mechanisms to have different telescopic distances, forming a certain gap, the angles of the scrapers 21 of the first and second scraper discharging mechanisms can be adjusted to scrape off the slag intercepted on the second-layer drum 4 and the slime intercepted on the first-layer drum 2. While scraping, the scrapers 21 of the first and second scraper discharging mechanisms are extended to the outermost until all the slag and slime are scraped off. Finally, the first-layer drum 2, the second-layer drum 4 and the flexible filter medium installed on the first-layer drum 2 are disassembled, cleaned and maintained.

Claims

1. A centrifuge that realizes dual separation of slag separation and dehydration of ore washing slurry, characterized in that: It includes a shell, a feed pipe, a rotating shaft, a bearing support installed outside the top of the shell, and a first-layer drum, a bearing 1, a bearing 2, a second-layer drum, a material distribution mechanism and a differential system installed in the shell. The bearing 1 and the bearing 2 are respectively connected to the differential system, the differential system is installed on the top of the shell, and the bearing 2 is movably installed in the bearing 1. The bottom end of the rotating shaft moves through the bearing support, the differential system, and the bearing 2 in sequence to connect the material distribution mechanism. The first-layer drum is movably connected between the bearing 1 and the bottom of the shell, the second-layer drum is located in the first-layer drum, and the material distribution mechanism is located in the second-layer drum. The material distribution mechanism and the second-layer drum are respectively movably connected between the bearing 2 and the bottom of the shell. One end of the feed pipe passes through the bottom of the shell and extends into the material distribution mechanism. A liquid phase outlet, a solid phase outlet 1 and a solid phase outlet 2 are provided at the bottom of the shell. The liquid phase outlet is arranged between the first-layer drum and the shell, the solid phase outlet 1 is arranged between the first-layer drum and the second-layer drum, and the solid phase outlet 2 is arranged between the second-layer drum and the column barrel 2.

2. The centrifuge according to claim 1, characterized in that The bearing 1 is composed of a trapezoidal annular body and an annular base, and the bottom surface of the annular base is provided with a guide rail and an annular slide rail 1 for movably connecting the first layer of the drum from the inside to the outside. The bearing 2 is formed into an inverted T shape by an annular column and an annular disk. The bottom surface of the annular disk is provided with an annular groove for movably connecting the material distribution mechanism and an annular slide rail 2 for movably connecting the second layer of the drum from the inside to the outside, and a plurality of sliding blocks connected to the guide rails are arranged in an array in the circumferential direction at the edge of the annular disk. An annular slide rail 3 corresponding to the annular slide rail 1 and an annular slide rail 4 corresponding to the annular slide rail 2 are provided at the bottom of the shell, and both ends of the first layer of the drum are movably connected to the annular slide rail 1 and the annular slide rail 3, respectively, and both ends of the second layer of the drum are movably connected to the annular slide rail 2 and the annular slide rail 4, respectively.

3. The centrifuge according to claim 1, characterized in that A scraper unloading mechanism 1 is provided between the first drum and the second drum, and the two ends of the scraper unloading mechanism 1 are respectively installed on the bearing 2 and the bottom of the shell; a scraper unloading mechanism 2 is provided between the material distribution mechanism and the second drum, and the two ends of the scraper unloading mechanism 2 are respectively installed on the material distribution mechanism.

4. The centrifuge according to claim 3, characterized in that The scraper unloading mechanism 1 and the scraper unloading mechanism 2 respectively include a scraper, a metal fixing, a telescopic tube A and a telescopic tube B. The metal fixing is L-shaped. The two ends of the scraper are respectively connected to one end of the telescopic tube A and the telescopic tube B, and the other ends of the telescopic tube A and the telescopic tube B are respectively connected to the metal fixings. The metal fixings at both ends of the scraper unloading mechanism 1 are respectively installed on the bearing 2 and the bottom of the shell; the metal fixings at both ends of the scraper unloading mechanism 2 are respectively installed on the material dividing mechanism. A brush 1 is provided on the metal fixing at the bottom of the scraper unloading mechanism 1, and a brush 2 is provided on the metal fixing at the bottom of the scraper unloading mechanism 2.

5. The centrifuge according to claim 1, characterized in that: The material distribution mechanism includes a column barrel 1, a diverter, a material distribution barrel and a column barrel 2. The material distribution barrel and the diverter are respectively installed at the bottom of the column barrel 1, and the diverter is located in the material distribution barrel. The column barrel 2 is connected to the bottom end of the material distribution barrel. The material distribution barrel is tubular and has multiple rows of material distribution holes in the circumferential direction.

6. The centrifuge according to claim 5, characterized in that The diverter is in the shape of an inverted bowl, and the cross section of the inverted bowl is a trapezoid.

7. The centrifuge according to claim 1, characterized in that The outer side of the bottom of the shell is also provided with supporting feet.

8. The centrifuge according to claim 1, characterized in that The first drum is provided with a flexible filter medium, and the flexible filter medium is selected with different interception particle sizes according to the different particle size distributions of the ore washing slurry under different working conditions.

9. The centrifuge according to claim 1, characterized in that The liquid phase outlet, solid phase outlet 1 and solid phase outlet 2 are respectively provided with two, and the two liquid phase outlets are symmetrically arranged on both sides of the bottom of the shell, and are located between the first layer of the drum and the shell, the two solid phase outlets 1 are symmetrically arranged on both sides of the bottom of the shell, and are located between the first layer of the drum and the second layer of the drum, and the two solid phase outlets 2 are symmetrically arranged on both sides of the bottom of the shell, and are located between the second layer of the drum and the second column.

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