Bauxite desliming device and bauxite desliming method

Abstract

The application relates to a bauxite desliming device and a bauxite desliming method, wherein the bauxite desliming device comprises a first roller screen assembly, a first crusher assembly, a second crusher assembly, a second roller screen assembly and a rotary kiln assembly; the main discharge port of the first roller screen assembly is connected with the feeding port of the first crusher assembly; the side discharge port of the first roller screen assembly is connected with the feeding port of the second crusher assembly; the discharge port of the second crusher assembly is connected with the feeding port of the second roller screen assembly; the feeding port of the rotary kiln assembly is connected with the discharge port of the second roller screen assembly, and the smoke outlet of the rotary kiln assembly is connected with raw materials; the discharge port of the rotary kiln assembly is connected with the first magnetic separator assembly; and the discharge port of the first crusher assembly is connected with the second magnetic separator assembly. The technical scheme of the application solves the problems of waste of water resources and soil erosion caused by bauxite desliming in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of bauxite desliming, and more specifically, to a bauxite desliming device and method. Background Technology

[0002] Muddy bauxite consists of bauxite lumps and fragments (particles larger than 1 mm and smaller than 1 mm) with an average content of 63.5%. The average plasticity of the mud is 22.8, and it contains a small amount of mud, making it a difficult-to-wash ore. The ore surface is rough, with embedded mud and clay, requiring vigorous washing and scrubbing to remove it. The mud in muddy bauxite is clay and sub-clay, reddish-brown in color, and highly viscous. A small amount consists of bauxite particles smaller than 1 mm. Its main characteristics are:

[0003] (1) The particle size distribution is relatively fine, with 0.037mm particles accounting for more than 80%.

[0004] (2) The physical and mechanical properties of clay are special, and it has the characteristics of red clay, such as large porosity, low compressibility and high liquid limit.

[0005] (3) The natural water content is relatively large, while the liquidity index is relatively small. This indicates that the water content is mainly composed of molecularly bound water. Molecular water has viscosity and is difficult to separate.

[0006] It is evident that the clay in accumulated bauxite has unique physical and mechanical properties, which leads to increased ore strength, reduced compressibility, and increased stability, making it difficult to separate the ore from the slime adhering to its surface.

[0007] A key characteristic of sedimentary bauxite deposits is their high clay content, which distinguishes them from general soil and rock properties and is fundamentally different from the sedimentary bauxite deposits already mined in my country. Sedimentary bauxite requires washing to remove approximately 60% of the clay from the raw ore, while also removing the mud embedded in the surface of the bauxite to obtain clean aluminum concentrate. This is the main challenge encountered in the development and utilization of sedimentary bauxite deposits in my country. Currently, the processing of sedimentary bauxite generally employs a water washing and crushing process, which consumes a large amount of water resources. The resulting tailings require special storage facilities, causing not only necessary soil and water loss but also significant safety hazards. The produced clean bauxite ore, due to its excessive clay and water content, affects subsequent processing and smelting, increasing smelting costs. Furthermore, the high clay content in the raw sedimentary bauxite ore makes it difficult for current washing processes to remove the outer clay coating, impacting subsequent processing and smelting. Summary of the Invention

[0008] This application provides a desliming device and method for bauxite, in order to solve the problems of water waste and soil erosion caused by desliming in existing bauxite processes.

[0009] A desliming device for bauxite according to this application includes: a first drum screen assembly; a first crusher assembly, the main discharge port of the first drum screen assembly being connected to the feed port of the first crusher assembly; a second crusher assembly, the side discharge port of the first drum screen assembly being connected to the feed port of the second crusher assembly; a second drum screen assembly, the discharge port of the second crusher assembly being connected to the feed port of the second drum screen assembly; a rotary kiln assembly, the feed port of the rotary kiln assembly being connected to the discharge port of the second drum screen assembly, and the flue gas outlet of the rotary kiln assembly being connected to the raw material; a first magnetic separator assembly, the discharge port of the rotary kiln assembly being connected to the first magnetic separator assembly; and a second magnetic separator assembly, the discharge port of the second magnetic separator assembly being connected to the discharge port of the first crusher assembly.

[0010] Furthermore, the rotary kiln assembly includes a rotary kiln drive motor, a rotary kiln body, and a burner structure. The output end of the rotary kiln drive motor is connected to the side wall of the rotary kiln body, and the combustion end of the burner structure is located at the discharge port of the rotary kiln body and faces the interior of the rotary kiln body.

[0011] Furthermore, the burner structure includes a burner nozzle, which includes an axial flow air hole, an outer swirling flow air hole, a first air hole, a second air hole, a central air hole, and an inner swirling flow air hole. The central air hole is located at the center of the burner nozzle. There are multiple inner swirling flow air holes, which are located circumferentially outside the central air hole. The second air hole is located circumferentially outside the multiple inner swirling flow air holes. The first air hole is located circumferentially outside the second air hole. There are multiple outer swirling flow air holes, which are located circumferentially outside the first air hole. The axial flow air hole is located circumferentially outside the outer swirling flow air hole.

[0012] Furthermore, the burner nozzle is circular, and the axis of the burner nozzle coincides with the central axis of the rotary kiln body. The cross-sectional area of ​​the burner nozzle accounts for between 1 / 3 and 3 / 5 of the cross-sectional area of ​​the rotary kiln body.

[0013] Furthermore, the diameter of the central air hole is 1 / 15 to 1 / 12 of the burner nozzle, the inner swirling air hole is between 3.8 mm and 6.2 mm, and the diameter of the circle containing the inner swirling air hole is 2 to 3 times the diameter of the central air hole.

[0014] Furthermore, the first air vent is a complete annular shape, and there are multiple second air vents, each of which is elliptical in shape. The dimensions and shape of the second air vents should satisfy: b 2 x 2 +a 2 y 2 =a 2 b 2, 0.28R < a < 0.3R, 0.1R < b < 0.12R, where a is the major axis of the elliptical air hole, b is the minor axis of the elliptical air hole, and R is the outer diameter dimension of the burner. This design enables the combustion particles to obtain a relatively wide purging margin, allowing them to be better purged by the inner swirling air flow, thereby achieving a better combustion effect.

[0015] Further, the flue of the rotary kiln body is connected to the algae cultivation device.

[0016] Further, the rotary kiln assembly further includes a discharge port structure. The discharge port structure is connected to the outlet of the rotary kiln body. The discharge port structure includes a kiln furnace discharge housing, an upper screen, a reinforcement member, a lower screen, a kiln furnace discharge port, and a kiln furnace slag discharge port. The first end of the upper screen is connected to the inner wall of the kiln furnace discharge housing, the second end of the upper screen is connected to the reinforcement member, and the first end to the second end of the upper screen gradually slopes downward. The first end of the lower screen is connected to the reinforcement member, the second end of the lower screen is connected to the kiln furnace discharge port, the second end of the upper screen is higher than the first end of the lower screen, and the kiln furnace slag discharge port is connected to the bottom of the upper screen and the bottom of the lower screen.

[0017] According to another aspect of the present application, a method for de-sludging bauxite is also provided, including the following steps: screening the raw materials; the raw materials with the largest particles enter the first crusher assembly; the remaining raw materials enter the second crusher assembly, and after passing through the second crusher assembly, they enter the second drum screen assembly; the raw materials removed from the second drum screen assembly enter the rotary kiln assembly; the raw materials removed from the rotary kiln assembly are further screened by the first magnetic separator; the raw materials removed from the first crusher assembly are screened by the second magnetic separator.

[0018] Further, the following steps are also included: the flue of the rotary kiln assembly is connected to the algae cultivation device, and the screened mud is backfilled into the mined-out area.

[0019] Applying the technical solution of the present application, when de-sludging bauxite, it is preliminarily screened by the first drum screen assembly, and a part of the raw materials enter the rotary kiln assembly through the first crusher assembly, the second crusher assembly, and the second drum screen assembly, and de-sludging is carried out by means of combustion and high temperature. This can greatly save water resources. In addition, the de-sludged material is easy to collect, and the collected mud can be backfilled, which is beneficial to improving the environmental damage. The technical solution of the present application effectively solves the problems of water resource waste and soil erosion caused by bauxite de-sludging in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments in accordance with the present application, and are used together with the specification to explain the principles of the present application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the bauxite desliming process of this application is shown;

[0023] Figure 2 It shows Figure 1 A schematic diagram of the rotary kiln assembly of the desliming device;

[0024] Figure 3 It shows Figure 1 A schematic diagram of the discharge port structure of the rotary kiln assembly of the desliming device;

[0025] Figure 4 It shows Figure 1 A schematic diagram of the burner nozzle structure of a rotary kiln assembly.

[0026] The above figures include the following reference numerals:

[0027] 1. Axial flow air vent; 2. Outer vortex air vent; 3. First air vent; 4. Second air vent; 5. Central air vent; 6. Inner vortex air vent; 7. Upper screen; 8. Lower screen; 9. Kiln outlet; 10. Reinforcing component; 11. Kiln slag outlet; 12. Kiln outlet shell; 221. Kiln tail smoke chamber; 222. First elevator; 223. Feeder; 224. Rotary drying kiln body; 225. Large gear ring; 226. Burner; 227. Fan; 228. Second elevator; 229. Hopper; 230. Support-thrust wheel assembly; 231. Pinion gear; 232. Gear motor; 233. Algae cultivation device. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0031] like Figures 1 to 4 As shown, this embodiment of a bauxite desliming device includes: a first drum screen assembly, a first crusher assembly, a second crusher assembly, a third crusher, a second drum screen assembly, a rotary kiln assembly, a first magnetic separator assembly, and a second magnetic separator assembly. The main discharge port of the first drum screen assembly is connected to the feed port of the first crusher assembly. The side discharge port of the first drum screen assembly is connected to the feed port of the second crusher assembly. The discharge port of the second crusher assembly is connected to the feed port of the second drum screen assembly. The side discharge port of the second drum screen assembly is connected to the feed port of the third crusher assembly. The feed port of the rotary kiln assembly is connected to the discharge port of the second drum screen assembly, and the flue gas outlet of the rotary kiln assembly is connected to the raw material. The discharge port of the rotary kiln assembly is connected to the first magnetic separator assembly. The discharge port of the second magnetic separator assembly is connected to the discharge port of the first crusher assembly.

[0032] By applying the technical solution of this application, bauxite undergoes preliminary screening via a first drum screen assembly during desliming. A portion of the raw material then passes through a second crusher assembly, a third crusher assembly, a second drum screen, and a third drum screen assembly before entering a rotary kiln assembly for desliming via combustion and high temperature. This significantly saves water resources, and the deslimed material is easy to collect; the collected mud can be backfilled, which helps mitigate environmental damage. The technical solution of this application effectively solves the problems of water waste and soil erosion caused by existing bauxite desliming techniques.

[0033] It should be noted that in this embodiment, two-stage crushing and screening were used before drying, and three-stage crushing and screening were used during wet screening. This results in more uniform screening and reduces the intensity of subsequent separation.

[0034] like Figures 2 to 4As shown, in this embodiment, the rotary kiln assembly includes a rotary kiln drive motor (gear motor 232), a rotary kiln body, and a burner structure. The output end of the rotary kiln gear motor 232 is connected to the side wall of the rotary kiln body, and the combustion end of the burner structure is located at the discharge port of the rotary kiln body and faces the interior of the rotary kiln body. A gear is provided at the output end of the rotary kiln gear motor 232, and a large gear (large gear ring 225) meshing with a small gear 231 is provided on the outer wall of the rotary kiln body. The gear motor 232 drives the rotary kiln body to rotate. The combustion end of the burner structure is located inside the rotary kiln body, which allows for full utilization of heat. Furthermore, the injection of heat from the burner structure into the interior of the rotary kiln body agitates the gas inside the kiln body.

[0035] like Figure 2 and Figure 3 As shown, in the technical solution of this embodiment, the burner structure includes a burner nozzle, which includes an axial flow air hole 1, an outer swirling flow air hole 2, a first air hole 3, a second air hole 4, a central air hole 5, and an inner swirling flow air hole 6. The central air hole 5 is located at the center of the burner nozzle 226. Multiple inner swirling flow air holes 6 are located circumferentially outside the central air hole 5. The second air hole 4 is located circumferentially outside the multiple inner swirling flow air holes 6. The first air hole 3 is located circumferentially outside the second air hole 4. Multiple outer swirling flow air holes 2 are located circumferentially outside the first air hole 3. The axial flow air hole 1 is located circumferentially outside the outer swirling flow air hole 2. The arrangement of these air holes ensures sufficient fuel contact and combustion, maximizing heat utilization. Furthermore, the airflow within the rotary kiln body agitates the airflow, resulting in more uniform heat distribution. This structure also allows the airflow to exert a moving, stripping force on the mud, leading to better desliming.

[0036] like Figures 2 to 4 As shown, in this embodiment, the burner nozzle is circular, and its axis coincides with the central axis of the rotary kiln body. The cross-sectional area of ​​the burner nozzle is between 1 / 3 and 3 / 5 of the cross-sectional area of ​​the rotary kiln body. This structure provides good combustion. If the cross-sectional area of ​​the burner nozzle is the same as that of the rotary kiln body, it not only wastes fuel but also results in poor desliming. If the cross-sectional area of ​​the burner nozzle is smaller, the impact of combustion on the raw materials is less.

[0037] like Figure 3As shown, in the technical solution of this embodiment, the diameter of the central air hole 5 accounts for 1 / 15 to 1 / 12 of the nozzle of the burner. The inner swirl air hole 6 is between 3.8 mm and 6.2 mm, and the diameter of the circle where the inner swirl air hole 6 is located is 2 to 3 times the diameter of the circle of the central air hole 5. The respective sizes of the above-mentioned central air hole 5 and inner swirl air hole 6, as well as the sizes of their mutual cooperation, enable the air flow pressure, air flow rate, and fuel to fully contact and burn, and can also play a role in agitating the gas inside the rotary kiln body. It should be noted that the included angle between the axis of the inner swirl air hole 6 and the central air hole 5 is between 3° and 25°, and the included angle between the outer swirl air hole 2 and the central air hole 5 is between 2° and 27°. Among them, the included angle between the inner swirl air hole 6 and the outer swirl air hole 2 is between 3° and 7°, and the inclination angle of the inner swirl air hole 6 is greater than that of the outer swirl air hole 2. The inclination angle of the inner swirl air hole 6 being greater than that of the outer swirl air hole 2 enables the air flow of the inner swirl air hole 6 to drive the air flow (flame) of the outer swirl air hole 2. Through simulation, this effect is better, that is, the inner swirl air hole 6 can provide power for the flame of the outer swirl air hole 2, and the flame of the outer swirl air hole 2 plays a greater role in the de-sludging of raw materials.

[0038] As Figure 4 shown, in the technical solution of this embodiment, the first air hole 3 is in a whole circular ring shape, the second air holes 4 are multiple, each second air hole 4 is in an elliptical shape, and the elliptical shape of the second air hole 4 and the size and shape of the second air hole 4 should satisfy:

[0039] b 2 x 2 +a 2 y 2 =a 2 b 2 , 0.28R < a < 0.3R, 0.1R < b < 0.12R. Here, a is the major axis of the elliptical air hole, b is the minor axis of the elliptical air hole, and R is the outer diameter size of the burner. This design can enable the combustion particles to obtain a relatively wide purging margin, making them better purged by the inner swirl air flow, and thus obtaining a better combustion effect.

[0040] As Figure 1 shown, in the technical solution of this embodiment, the flue of the rotary kiln body is connected to the algae cultivation device 233. In this way, on the one hand, it avoids environmental pollution, and on the other hand, it can effectively achieve waste utilization.

[0041] As Figure 3As shown in the technical solution of this embodiment, the rotary kiln assembly also includes a discharge port structure. The discharge port structure is connected to the outlet of the rotary kiln body. The discharge port structure includes an upper screen 7, a lower screen 8, a kiln discharge port 9, a reinforcing member 10, a kiln slag discharge port 11, and a kiln discharge shell 12. The first end of the upper screen 7 is connected to the inner wall of the kiln discharge shell 12, and the second end of the upper screen 7 is connected to the reinforcing member 10. The upper screen 7 gradually slopes downward from the first end to the second end. The first end of the lower screen 8 is connected to the reinforcing member, and the second end of the lower screen 8 is connected to the kiln discharge port 9. The second end of the upper screen 7 is higher than the first end of the lower screen 8. The kiln slag discharge port 11 is connected to the bottom of the upper screen 7 and the bottom of the lower screen 8. The aforementioned structure allows for further desliming and separation of the bauxite removed from the rotary kiln body. The multi-segmented screen at varying heights effectively ensures optimal desliming performance; moving the material only on a single screen segment is less effective than drop-down desliming. Furthermore, this embodiment fully utilizes its own structure for desliming, resulting in better separation and a more compact structure.

[0042] This application also provides a method for desliming bauxite, comprising the following steps: raw materials enter a first drum screen for screening; the largest particles of raw materials enter a first crusher assembly (the aforementioned largest particles or large particles refer to particles larger than 8000 cubic centimeters in this application); the remaining raw materials enter a second crusher assembly, and after passing through the second crusher assembly, enter a second drum screen assembly; the raw materials removed from the second drum screen assembly enter a third crusher, and then enter the second drum screen assembly; the raw materials removed from the third drum screen assembly enter a rotary kiln assembly; the raw materials removed from the rotary kiln assembly are then screened by a first magnetic separator; the raw materials removed from the first crusher assembly are screened by a second magnetic separator. The method for desliming bauxite further includes the following steps: the flue of the rotary kiln assembly is connected to an algae cultivation device, and the screened mud is backfilled into the mined-out area.

[0043] The following table compares the process parameters of the mineral processing method of this application with those of the traditional water washing method in industrial trials. The method can effectively reduce the water content and mud content of the ore and increase the throughput of the raw ore per unit time.

[0044]

[0045] Bauxite sample #1 was a washed sample, and bauxite sample #2 was a sample prepared using the method proposed in this application. A comparative leaching test was conducted using an autoclave under identical experimental conditions. The relevant data are recorded in Tables 1 and 2 below. The ore leaching was good, and it reduced the A / S and N / S values ​​of the leached red mud, thus lowering the cost of tailings treatment.

[0046] Table 1.1# Bauxite Leaching Performance Test Record Sheet

[0047]

[0048]

[0049] Table 2.2# Bauxite Leaching Performance Test Record Sheet

[0050]

[0051]

[0052] The technical solution of this application allows switching between wet separation and drying desliming, with the switching process using a conveyor belt (details omitted here). This method provides good desliming results. Furthermore, by employing a kiln for desliming, water consumption is significantly reduced.

[0053] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A desliming device for bauxite, characterized in that, include: First drum screen assembly; The first crusher assembly has its main discharge port connected to the feed port of the first crusher assembly. The second crusher assembly has its side discharge port of the first drum screen assembly connected to the feed port of the second crusher assembly. The discharge port of the second crusher assembly is connected to the feed port of the second drum screen assembly; A rotary kiln assembly, wherein the feed inlet of the rotary kiln assembly is connected to the discharge outlet of the second drum screen assembly, and the flue gas outlet of the rotary kiln assembly is connected to the raw material; The first magnetic separator assembly is connected to the discharge port of the rotary kiln assembly. The second magnetic separator assembly is connected to the discharge port of the first crusher assembly; The rotary kiln assembly includes a rotary kiln drive motor, a rotary kiln body, and a burner structure. The output end of the rotary kiln drive motor is connected to the side wall of the rotary kiln body, and the combustion end of the burner structure is located at the discharge port of the rotary kiln body and faces the interior of the rotary kiln body. The burner structure includes a burner nozzle, which includes an axial flow air hole, an outer swirling flow air hole, a first air hole, a second air hole, a central air hole, and an inner swirling flow air hole. The central air hole is located at the center of the burner nozzle. The inner swirling flow air hole includes multiple inner swirling flow air holes, which are located circumferentially outside the central air hole. The second air hole is located circumferentially outside the multiple inner swirling flow air holes. The first air hole is located circumferentially outside the second air hole. The outer swirling flow air hole includes multiple outer swirling flow air holes, which are located circumferentially outside the first air hole. The axial flow air hole is located circumferentially outside the outer swirling flow air hole. The angle between the inner swirling air hole (6) and the central air hole (5) is between 3° and 25°, and the angle between the outer swirling air hole (2) and the central air hole (5) is between 2° and 27°. The angle between the inner swirling air hole (6) and the outer swirling air hole (2) is between 3° and 7°, and the inner swirling air hole (6) has a larger tilt angle than the outer swirling air hole (2).

2. The bauxite desliming device according to claim 1, characterized in that, The burner nozzle is circular, and its axis coincides with the central axis of the rotary kiln body. The cross-sectional area of ​​the burner nozzle accounts for between 1 / 3 and 3 / 5 of the cross-sectional area of ​​the rotary kiln body.

3. The bauxite desliming device according to claim 1, characterized in that, The diameter of the central air hole is 1 / 15 to 1 / 12 of the burner nozzle, the inner swirling air hole is between 3.8 mm and 6.2 mm, and the diameter of the circle containing the inner swirling air hole is 2 to 3 times the diameter of the central air hole.

4. The bauxite desliming device according to claim 1, characterized in that, The first air vent is a complete annular shape, and there are multiple second air vents, each of which is elliptical in shape. The dimensions and shape of the second air vents should meet the following requirements: , a The major axis of the elliptical air vent is... b It is the minor axis of the elliptical air vent.

5. The bauxite desliming device according to claim 1, characterized in that, The flue of the rotary kiln body is connected to the algae cultivation device.

6. The bauxite desliming device according to claim 1, characterized in that, The rotary kiln assembly also includes a discharge port structure connected to the outlet of the rotary kiln body. The discharge port structure includes a kiln discharge shell, an upper screen, a reinforcing member, a lower screen, a kiln discharge port, and a kiln slag discharge port. The first end of the upper screen is connected to the inner wall of the kiln discharge shell, and the second end of the upper screen is connected to the reinforcing member. The upper screen gradually slopes downward from its first end to its second end. The first end of the lower screen is connected to the reinforcing member, and the second end of the lower screen is connected to the kiln discharge port. The second end of the upper screen is higher than the first end of the lower screen. The kiln slag discharge port is connected to the bottom of the upper screen and the bottom of the lower screen.

7. A method for desliming bauxite, characterized in that, The desliming method employs the desliming apparatus according to any one of claims 1 to 6, and includes the following steps: The raw materials are screened; The largest particles of raw material enter the first crusher assembly; The remaining raw materials enter the second crusher assembly, and after passing through the second crusher assembly, they enter the second drum screen assembly; The raw material removed from the second drum screen assembly enters the rotary kiln assembly; The raw materials removed from the rotary kiln assembly are then screened by the first magnetic separator; The raw materials removed from the first crusher assembly are screened by the second magnetic separator.

8. The method for desliming bauxite according to claim 7, characterized in that, It also includes the following steps: The flue of the rotary kiln assembly is connected to the algae cultivation device, and the screened soil is used to backfill the mined-out area.

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