An environmentally friendly desliming process for bauxite beneficiation

Abstract

This invention relates to the field of mining engineering technology, specifically to an environmentally friendly desliming process for bauxite beneficiation, comprising the following steps: raw ore washing and desliming, fine mud concentration and water separation, slurry filtration and wastewater return, and clean water replenishment and system circulation. During operation, the fine mud-containing slurry in the collection tank below the desliming screen is pumped to the concentration equipment. During the operation of the concentration equipment, the slurry slowly diffuses and settles within the equipment, while the fine mud particles settle downwards under gravity, forming concentrated slurry. Clear water is formed at the top and flows back into the clean water tank for recycling. During the operation of the filter press, the wastewater generated by filtration also flows into its matching collection tank. Through a return pipeline and a quantitative conveying pump, this portion of wastewater is quantitatively and continuously transported to the desliming screen collection tank in step S1. The return flow rate matches the slurry flow rate in the desliming screen collection tank, achieving internal circulation of wastewater within the system and avoiding water waste and a significant increase in load during subsequent treatment.

Description

Technical Field

[0001] This invention relates to the field of mining engineering technology, and in particular to an environmentally friendly desliming process for bauxite beneficiation. Background Technology

[0002] Bauxite is the core raw material for the production of alumina. During its beneficiation process, the raw ore often contains a large amount of fine mud, mainly clay minerals such as clay, kaolin, and hydromica. This fine mud will seriously affect the efficiency of subsequent beneficiation and the quality of the product. Therefore, desliming is a key pre-process in bauxite beneficiation. Most existing bauxite desliming processes adopt an open process of "washing-concentration-discharge".

[0003] For example, Chinese patent application number CN202411698054.X discloses a desliming device for mining and mineral processing operations, including a main body with a U-shaped groove attached to its top. A diversion box is located at one end of the main body, and a hydrocyclone is installed between the main body and the diversion box. The final solid-liquid separation is achieved through the relative movement and compression of the upper and lower mesh belts, ensuring that substances of different phases are separated and processed in the intended manner, improving the convenience and environmental friendliness of subsequent processing. The convenient cleaning method for each component solves the problem of difficult mud and sand removal in traditional equipment. However, it only discharges the liquid into the sewage treatment facility through a drain pipe located outside the diversion box. Although this can mitigate the environmental impact to some extent, it still requires a continuous pumping of fresh water to replenish the losses during system operation. This desliming process fails to promptly recycle and reuse the sewage, resulting in a large volume of sewage to be treated, leading to water waste and a surge in the treatment load. Summary of the Invention

[0004] In view of this, the purpose of this invention is to propose an environmentally friendly desliming process for bauxite beneficiation, in order to solve the technical problems of existing technologies that still require a continuous pumping of fresh water to compensate for losses during system operation, and the failure of the desliming process to recycle and reuse wastewater in a timely manner, resulting in a large volume of wastewater to be treated, leading to water waste and a surge in treatment load.

[0005] To achieve the above objectives, the present invention provides an environmentally friendly desliming process for bauxite beneficiation, which includes the following steps: S1. Raw ore washing and desliming: First, clean water is pumped to the desliming screen to wash the raw ore. During the washing process, the liquid collection tank on the desliming screen will collect a thin slurry containing a large amount of fine mud to complete the initial desliming treatment of the raw ore. S2, Fine mud thickening and water separation: The fine mud-containing slurry from the S1 process is pumped to a thickening device for sedimentation and thickening. Inside the thickening device, the slurry is separated into two parts: the thickened slurry formed by sedimentation at the bottom and the clear water produced after clarification at the top. The clear water is then recycled to the clear water tank. S3, Slurry Filtration and Wastewater Recirculation: The concentrated slurry discharged from the bottom of the thickening equipment is pumped into the filter press for pressurized dewatering to form a filter cake. During the operation of the filter press, its matching collection tank will collect the wastewater generated by filtration. This wastewater is not discharged externally, but is recycled to the desliming screen collection tank in the S1 process to realize the internal wastewater circulation treatment of the system. S4. Clean Water Supply and System Circulation: The clean water tank, which collects recycled clean water, provides water storage for the entire circulating water system on the one hand, and introduces new water through an external water supply pipe to replenish the natural losses during system operation on the other hand. Finally, the water in the clean water tank is supplied to the clean water pump, thus forming a complete closed-loop water circulation system with internal sewage recycling treatment.

[0006] Furthermore, in the S2 fine mud concentration and reclaimed water separation process, a flocculant is added to the concentration equipment to accelerate the settling of fine mud particles.

[0007] Furthermore, the filter cake produced in the S3 slurry filtration and wastewater recirculation process is transported to a stockpile or used as raw material for subsequent processing.

[0008] Furthermore, the clean water recovered in the S2 fine mud concentration and water separation process is reused as rinsing water in the S raw ore washing and desliming process.

[0009] Furthermore, the wastewater from the filter press collection tank in step S3 is quantitatively and continuously transported to the sludge removal and screening collection tank in step S1 through a return pipe.

[0010] Furthermore, the filter press in the S3 process is a plate and frame filter press or a chamber filter press.

[0011] Furthermore, the concentration device includes: The upper port of the central water inlet cylinder is connected to the liquid collection tank on the desliming screen; An inverted conical bucket is provided on the outside of the central water inlet tank, and the bottom of the bucket is provided with a bottom outlet, which is connected to the slurry pump; An annular overflow trough is provided at the top of the bucket body, and the annular overflow trough is connected to the clear water tank. The clear water produced after clarification in the upper part is recycled back to the clear water tank through the annular overflow trough. Several bundles of oblique tubes evenly distributed circumferentially on the inner wall of the hopper; A high-pressure air duct is provided at the lower part of the bucket body, and the high-pressure air duct is positioned below the bundle-shaped inclined tube; Adjustment section for regulating the discharge of fine mud-containing dilute mineral slurry from the outlet of the central water inlet tank.

[0012] Furthermore, the adjustment unit includes: The inlet flange is located at the top of the central inlet tank cylinder; A flow hopper is provided at the outlet of the central water inlet tank, and there is a material passage gap between the flow hopper and the outlet of the central water inlet tank; The lower end is fixedly connected to the top of the flow hopper, and the lifting screw is threadedly connected to the inlet tank flange; A handwheel is provided at the top of the lifting screw.

[0013] Furthermore, the bucket body is provided with an inclined tube support seat, the bottom of the bundle of inclined tubes abuts against the inclined tube support seat, the middle part of the inclined tube support seat is provided with a guide ring, and an avoidance gap is provided between the central water inlet tank and the guide ring.

[0014] Furthermore, a sliding plate is provided within the guide ring for limiting sliding, and a windward curved plate is provided at the lower part of the sliding plate. The windward curved plate corresponds to the air outlet of the high-pressure air duct. A cleaning rake is fixedly connected to the sliding plate, and the cleaning rake penetrates the clearance gap and cooperates with the end face of the bundle-shaped inclined tube.

[0015] The beneficial effects of this invention are as follows: In use, the fine mud-containing slurry in the collection tank below the desliming screen is pumped to the thickening equipment. During the operation of the thickening equipment, the slurry slowly diffuses and settles in the thickening equipment, and the fine mud particles settle downwards under the action of gravity to form a thickened slurry. The upper part forms clear water, which then flows into the clear water tank for recycling. During the operation of the filter press, the wastewater generated by filtration also flows into its matching collection tank. Through the return pipe and the quantitative conveying pump, this part of the wastewater is quantitatively and continuously transported to the desliming screen collection tank of the S1 process. The return flow rate matches the slurry flow rate in the desliming screen collection tank, realizing the internal circulation of wastewater within the system and avoiding water waste and a surge in load during subsequent treatment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a schematic diagram of the water system circulation path in this invention; Figure 3 This is a schematic diagram of the concentration equipment in this invention; Figure 4 This is a schematic diagram of the internal structure of the concentration equipment in this invention; Figure 5 This is a schematic diagram of the assembly of the adjusting part and the central water inlet tank in this invention; Figure 6 This is a schematic diagram of the assembly of the bundled inclined tube and the cleaning rake in this invention; Figure 7 This is a schematic diagram of the assembly of the sliding plate, the windward curved plate, and the cleaning rake in this invention.

[0018] The diagram is marked as follows: 1. Clear water pump; 2. Desliming screen; 3. Thickening equipment; 4. Clear water tank; 5. Slurry pump; 6. Filter press; 7. Water supply pipe; 8. Central inlet tank cylinder; 9. Hopper body; 10. Bottom outlet; 11. Annular overflow trough; 12. Bundle-shaped inclined tube; 13. High-pressure air duct; 14. Inlet tank flange; 15. Flow hopper; 16. Lifting screw; 17. Handwheel; 18. Inclined tube support seat; 19. Guide ring; 20. Sliding plate; 21. Windward curved plate; 22. Cleaning rake. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] An embodiment of the present invention proposes an environmentally friendly desliming process for bauxite beneficiation, such as... Figure 1-7 As shown, the process includes the following steps: S1. Raw ore washing and desliming: First, clean water is pumped to the desliming screen 2 by the clean water pump 1 to wash the raw ore. During the washing process, the liquid collection tank on the desliming screen 2 will collect a thin slurry containing a large amount of fine mud to complete the initial desliming treatment of the raw ore. S2, Fine mud thickening and water separation: The fine mud-containing slurry from the S1 process is pumped to the thickening equipment 3 for sedimentation and thickening. In the thickening equipment 3, the slurry is separated into two parts: the thickened slurry formed by the bottom sedimentation and the clear water produced after the upper clarification. The clear water is then recycled to the clear water tank 4. S3, Slurry Filtration and Wastewater Recirculation: The concentrated slurry discharged from the bottom of the thickening equipment 3 is sent to the filter press 6 by the slurry pump 5 for pressurization and dewatering to form a filter cake. During the operation of the filter press 6, its matching collection tank will collect the wastewater generated by filtration. This wastewater is not discharged externally, but is returned to the collection tank of the desliming screen 2 in the S1 process to realize the internal wastewater circulation treatment of the system. S4. Clean water supply and system circulation: The clean water tank 4, which collects recycled clean water, provides water storage for the entire circulating water system on the one hand, and introduces new water through the external water supply pipe 7 to replenish the natural losses during system operation on the other hand. Finally, the water in the clean water tank 4 is supplied to the clean water pump 1, thus forming a complete closed-loop water circulation system with internal sewage recycling treatment.

[0022] Specifically, when using this process, the first step is to start the clean water pump 1 and transport the clean water in the clean water tank 4 to the spray device of the desliming screen 2 to continuously wash the bauxite ore entering the desliming screen 2, ensuring that the fine mud on the surface of the ore is fully stripped off. The desliming screen 2 is a high-frequency vibrating screen, which can effectively intercept coarse bauxite particles. At the same time, the stripped fine mud is allowed to flow into the collection tank below the desliming screen 2 with the washing water, completing the preliminary desliming treatment of the ore. The coarse bauxite particles after preliminary desliming are sent to the subsequent mineral processing process. The fine mud-containing dilute slurry collected in the collection tank below the desliming screen 2 enters the next process. The fine mud-containing slurry in the collection tank below the desliming screen 2 of the previous process is pumped to the thickening equipment 3 by a conveying pump. At the same time, a suitable flocculant is added to the thickening equipment 3 in a quantitative manner. The flocculant and the slurry are fully mixed in the thickening equipment 3 to accelerate the agglomeration and sedimentation of fine mud particles. During the operation of the thickening equipment 3, the slurry slowly diffuses and settles in the thickening equipment 3, and the fine mud particles settle downward under the action of gravity to form a thickened slurry. The upper part forms clear water, which then flows into the clear water tank 4 to complete the recycling and can be directly used for subsequent washing operations. For the concentrated slurry discharged from the bottom outlet 10 of the thickening equipment 3, the slurry pump 5 is started to transport the discharged concentrated slurry to the filter press 6. The filter press 6 pressurizes and dewaters the concentrated slurry to form a filter cake. During the operation of the filter press 6, the wastewater generated by filtration flows into its matching collection tank. Through the return pipeline and the quantitative conveying pump, this part of the wastewater is quantitatively and continuously transported to the collection tank of the desliming screen 2 in the S1 process. The return flow rate matches the slurry flow rate in the collection tank of the desliming screen 2 to realize the internal circulation of wastewater in the system. The filter cake formed by the filter press is sent to a special stockpile for storage by the conveying device, or used as raw material for subsequent processing to realize the recycling of fine mud resources. Meanwhile, the clear water tank 4 collects the clarified water recovered from the fine mud concentration and water separation process, serving as the water storage carrier for the entire circulating water system. Fresh water is also connected to the system through the external water supply pipe 7 to replenish the natural losses caused by evaporation and filter cake entrainment during system operation. The amount of water replenished is dynamically adjusted according to the system water level and the amount of loss to ensure a stable water level in the clear water tank 4. The clear water in the clear water tank 4 is continuously supplied to the clear water pump 1, which then transports the water to the desludge screen 2 for washing the raw ore, forming a complete closed-loop water circulation system of "clear water supply - raw ore washing - fine mud concentration - sewage return - clear water recycling". The system water reuse rate reaches more than 92%, achieving zero sewage discharge.

[0023] In this embodiment, in the S2 fine mud concentration and water separation process, a flocculant is added to the concentration equipment 3 to accelerate the settling of fine mud particles. The flocculant can fully capture the fine mud particles in the slurry, reduce the content of suspended particles in the water, and significantly reduce the turbidity of the clean water recovered in the S2 process. This prevents the clean water from carrying fine mud into the subsequent washing process, prevents the fine mud from re-adhering to the surface of the raw ore, and ensures the cleaning and initial desliming effect of the raw ore.

[0024] In this embodiment, the filter cake produced in the S3 slurry filtration and wastewater recirculation process is transported to a stockpile or used as a raw material for subsequent processing, such as building materials, roadbed fillers, etc., to replace traditional raw materials.

[0025] In this embodiment, the clean water recovered in the S2 fine mud concentration and water separation process is reused as the rinsing water in the S1 raw ore washing and desliming process. After concentration and clarification, the water quality meets the standards and can directly replace fresh water for raw ore washing without additional treatment, which greatly improves the water reuse rate, further reduces the consumption of fresh water resources, and lowers production costs.

[0026] In this embodiment, the wastewater from the collection tank of filter press 6 in process S3 is quantitatively and continuously transported to the collection tank of desliming screen 2 in process S1 through the return pipe. This can replenish the slurry water in process S1, reduce the amount of clean water replenished in clear water tank 4, further save fresh water resources, and balance the water distribution of the entire system.

[0027] In this embodiment, the filter press 6 in the S3 process is a plate and frame filter press or a chamber filter press. The bauxite concentrated slurry has high viscosity and high fine mud content. Both plate and frame filter presses and chamber filter presses can provide high pressing pressure, which can effectively squeeze out the water in the slurry and quickly form a filter cake with low moisture content.

[0028] In this embodiment, the concentration device 3 includes: The upper port of the central water inlet cylinder 8 is connected to the liquid collection tank on the desliming screen 2; An inverted conical bucket 9 is located outside the central water inlet tank 8. The bottom of the bucket 9 is provided with a bottom outlet 10, which is connected to the slurry pump 5. An annular overflow trough 11 is provided at the top of the bucket body 9. The annular overflow trough 11 is connected to the clear water tank 4. The clear water produced after clarification in the upper part is recycled back to the clear water tank 4 through the annular overflow trough 11. Several bundles of inclined tubes 12 are evenly distributed circumferentially on the inner wall of the bucket body 9; A high-pressure air duct 13 is located at the lower part of the bucket body 9, and the high-pressure air duct 13 is positioned below the bundle-shaped inclined tube 12; A regulating section for adjusting the discharge of fine mud-containing dilute mineral slurry at the outlet of the central inlet tank 8; Specifically, the upper port of the central water inlet trough 8 receives the fine mud-containing dilute slurry from the collection tank of the desliming screen 2. The central water inlet trough 8 has a vertical downward structure, and the fine mud-containing dilute slurry is forced downward. The discharge rate of the fine mud-containing dilute slurry at the outlet of the central water inlet trough 8 is adjusted by the regulating unit to adapt to different mud contents and different flow rates of slurry working conditions, ensuring that the slurry enters the hopper 9 evenly and avoiding pulse impact. Several bundles of inclined tubes 12, evenly distributed around the inner wall of the bucket body 9, are arranged at a 60° angle to form a large number of shallow, independent settling channels. The slurry entering the bucket body 9 diffuses in all directions and needs to flow upward to pass through the bundles of inclined tubes 12. Fine mud particles settle rapidly in the inclined tubes under gravity and slide down the inclined tube walls to the lower part of the bucket body 9. The clear water after the fine mud particles settle slowly flows upward to form a clear water layer and flows to the top of the annular overflow trough 11, which is then recycled into the clear water trough 4, greatly improving the fine mud settling efficiency and the clear water clarification effect. The high-pressure air duct 13 at the bottom of the bucket body 9 is introduced from the lower side wall of the bucket body 9. The inlet of the high-pressure air duct 13 is close to the area of ​​the bottom outlet 10. By intermittently or continuously introducing high-pressure compressed air, tiny bubbles are generated and float upwards to slightly aerodynamically disturb, loosen, and turn over the mud layer. The loosened and compressed concentrated mud, under its own weight and aerodynamic disturbance, gathers towards the center of the equipment and is continuously discharged from the bottom outlet 10 to the filter press for drying, realizing a complete desludge decontamination process of fine mud concentration, clean water reuse, and environmental closed-loop.

[0029] In this embodiment, the adjustment unit includes: The inlet flange 14 is located at the top of the central inlet tank cylinder 8; A flow hopper 15 is installed at the outlet of the central water inlet cylinder 8, and there is a material passage gap between the flow hopper 15 and the outlet of the central water inlet cylinder 8. The lower end is fixedly connected to the top of the flow bucket 15. The lifting screw 16 is threadedly connected to the inlet tank flange 14. A handwheel 17 is provided on the top of the lifting screw 16; Specifically, by rotating the handwheel 17, the lifting screw 16 is moved up and down, thereby adjusting the material passage gap between the flow hopper 15 and the outlet of the central water inlet trough 8, achieving precise adjustment of the slurry discharge volume to adapt to different working conditions. The manual adjustment structure is simple, requiring no complex power equipment, making operation convenient and maintenance costs low. Furthermore, the flow hopper 15 can stabilize and evenly distribute the slurry discharged from the central water inlet trough 8, avoiding slurry pulse impact, and ensuring that the slurry enters the area of ​​the hopper body 9 and the bundled inclined tube 12 evenly, ensuring uniform settling of fine mud particles, improving concentration efficiency and water clarification effect.

[0030] In this embodiment, the bucket body 9 is provided with an inclined tube support seat 18, the bottom of the bundled inclined tube 12 abuts against the inclined tube support seat 18, the middle of the inclined tube support seat 18 is provided with a guide ring 19, and an avoidance gap is provided between the central water inlet cylinder 8 and the guide ring 19. The inclined tube support seat 18 plays a fixed support role for the bundled inclined tube 12, preventing the bundled inclined tube 12 from shifting, deforming or being damaged due to slurry impact and equipment vibration, extending the service life of the bundled inclined tube 12, ensuring the stable operation of the shallow settling function, and the avoidance gap can prevent the central water inlet cylinder 8 and the inclined tube support seat 18 from interfering with each other, while providing space for subsequent cleaning.

[0031] In this embodiment, a sliding plate 20 is provided within the guide ring 19 for limiting sliding. A windward curved plate 21 is provided at the lower part of the sliding plate 20. The windward curved plate 21 corresponds to the air outlet of the high-pressure air pipe 13. A cleaning rake 22 is fixedly connected to the sliding plate 20. The cleaning rake 22 passes through the clearance gap and cooperates with the end face of the bundled inclined tube 12. The high-pressure air ejected from the high-pressure air pipe 13 acts on the windward curved plate 21, pushing the sliding plate 20 to slide back and forth along the guide ring 19, thereby driving the cleaning rake 22 to scrape off the fine mud attached to the end face of the bundled inclined tube 12, avoiding blockage of the bundled inclined tube 12, solving the problem of high viscosity and easy blockage of bauxite fine mud, ensuring continuous and stable operation of the thickening equipment 3, and reducing downtime for cleaning.

[0032] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0033] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An environmentally friendly desliming process for bauxite beneficiation, characterized in that, The process includes the following steps: S1. Raw ore washing and desliming: First, clean water is pumped to the desliming screen (2) by the clean water pump (1) to wash the raw ore. During the washing process, the liquid collection tank on the desliming screen (2) will collect a large amount of fine mud in the thin slurry to complete the initial desliming treatment of the raw ore. S2, Fine mud thickening and water separation: The fine mud-containing slurry from the S1 process is pumped to the thickening equipment (3) for sedimentation and thickening. In the thickening equipment (3), the slurry is separated into two parts: the thickened slurry formed by the bottom sedimentation and the clear water produced after the upper clarification. The clear water is then recycled to the clear water tank (4). S3, Slurry Filtration and Wastewater Recirculation: The concentrated slurry discharged from the bottom of the thickening equipment (3) is sent to the filter press (6) by the slurry pump (5) for pressurization and dewatering to form a filter cake. During the operation of the filter press (6), its matching collection tank will collect the wastewater generated by filtration. This wastewater is not discharged externally, but is returned to the collection tank of the desludge screen (2) in the S1 process to realize the wastewater circulation treatment inside the system. S4. Clean water supply and system circulation: The clean water tank (4) collects recycled clean water, which provides water storage for the entire circulating water system on the one hand, and new water is connected through the external water supply pipe (7) to supplement the natural losses in the operation of the system on the other hand. Finally, the water in the clean water tank (4) is supplied to the clean water pump (1) for use, thus forming a complete closed-loop water circulation system with internal sewage circulation treatment.

2. The environmentally friendly desliming process for bauxite beneficiation according to claim 1, characterized in that, In the S2 fine mud thickening and reclaimed water separation process, flocculant is added to the thickening equipment (3) to accelerate the settling of fine mud particles.

3. The environmentally friendly desliming process for bauxite beneficiation according to claim 1, characterized in that, The filter cake produced in the S3 slurry filtration and wastewater recirculation process is transported to the stockpile or used as raw material for subsequent processing.

4. The environmentally friendly desliming process for bauxite beneficiation according to claim 1, characterized in that, The clean water recovered in the S2 fine mud concentration and water separation process is reused as the rinsing water in the S1 raw ore washing and desliming process.

5. The environmentally friendly desliming process for bauxite beneficiation according to claim 1, characterized in that, The wastewater from the filter press (6) collection tank in the S3 process is quantitatively and continuously transported to the sludge removal screen (2) collection tank in the S1 process through the return pipe.

6. The environmentally friendly desliming process for bauxite beneficiation according to claim 1, characterized in that, The filter press (6) in the S3 process is a plate and frame filter press or a chamber filter press.

7. The environmentally friendly desliming process for bauxite beneficiation according to claim 1, characterized in that, The concentration device (3) includes: The upper port of the central water inlet cylinder (8) is connected to the liquid collection tank on the desliming screen (2); An inverted conical bucket (9) is provided outside the central water inlet tank (8), and the bottom of the bucket (9) is provided with a bottom outlet (10), which is connected to the slurry pump (5). An annular overflow trough (11) is provided at the top of the bucket body (9). The annular overflow trough (11) is connected to the clear water tank (4). The clear water generated after clarification in the upper part is recycled back to the clear water tank (4) through the annular overflow trough (11). A bundle of inclined tubes (12) evenly distributed circumferentially on the inner wall of the bucket body (9); A high-pressure air duct (13) is provided at the lower part of the bucket body (9), and the high-pressure air duct (13) is located below the bundle-shaped inclined tube (12); Adjustment section for adjusting the discharge of fine mud-containing dilute mineral slurry at the outlet of the central water inlet tank (8).

8. The environmentally friendly desliming process for bauxite beneficiation according to claim 7, characterized in that, The adjustment unit includes: The inlet flange (14) is located at the top of the central inlet tank cylinder (8); A flow hopper (15) is provided at the outlet of the central water inlet cylinder (8), and there is a material passage gap between the flow hopper (15) and the outlet of the central water inlet cylinder (8). The lower end is fixedly connected to the top of the flow bucket (15) by a lifting screw (16), which is threaded onto the inlet tank flange (14). The top of the lifting screw (16) is equipped with a handwheel (17).

9. The environmentally friendly desliming process for bauxite beneficiation according to claim 7, characterized in that, The bucket body (9) is provided with an inclined tube support seat (18), the bottom of the bundled inclined tube (12) abuts against the inclined tube support seat (18), the middle part of the inclined tube support seat (18) is provided with a guide ring (19), and a clearance gap is provided between the central water inlet tank (8) and the guide ring (19).

10. The environmentally friendly desliming process for bauxite beneficiation according to claim 9, characterized in that, The guide ring (19) is equipped with a sliding plate (20) for limiting sliding. The lower part of the sliding plate (20) is provided with a windward curved plate (21). The windward curved plate (21) corresponds to the air outlet of the high-pressure air duct (13). A cleaning rake (22) is fixedly connected to the sliding plate (20). The cleaning rake (22) passes through the clearance gap and cooperates with the end face of the bundle-shaped inclined tube (12).

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