Impurity treatment device for aluminum oxide production

Abstract

The invention provides an impurity treatment device for aluminum oxide production, and relates to the technical field of aluminum oxide production, the impurity treatment device comprises: a housing having a feed port and a discharge port, the top of the housing being provided with a feed hopper; the filter cartridge is arranged on the inner wall surface of the shell, a spiral sliding plate is arranged on the outer wall surface of the fixed column, and a transition cavity is formed in the sliding plate; each inclined block is distributed on the surface of the top of the sliding plate, and a sieve hole is formed in one end of each inclined block; the first conveying mechanism is arranged on the inner wall surface of the shell; the sieve plate is arranged on the inner wall surface of the shell; and the water tank is arranged at the inner bottom of the shell, and a second conveying mechanism is arranged in the water tank. According to the treatment device, particles and powder impurities attached to the surface of bauxite can be pre-screened and filtered, the amount of a solution or a solvent used for follow-up impurity treatment is reduced, the purity of prepared aluminum oxide is improved, and the situation that heat generated when the bauxite is washed in water affects use of equipment can be prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of alumina production, and particularly relates to an impurity treatment device for alumina production. Background Art

[0002] At present, the main methods for preparing alumina from bauxite include the Bayer process and the sintering process. Before preparing alumina by these two methods, the bauxite needs to be crushed. First, the bauxite is coarsely crushed by a jaw crusher, then finely crushed by a cone crusher, and finally sent to a grinding mill to be ground into fine powder. After the bauxite is broken into appropriate-sized particles, it is more conducive to subsequent chemical reactions and leaching processes. Moreover, during the high-pressure digestion process, the fine particles can contact the lye more fully, improving the extraction efficiency of alumina. During the crushing process of bauxite, large impurities can be removed by screening, further ensuring the purity of bauxite. In addition, during the calcination process of the crushed bauxite, impurities such as silicon and iron will be decomposed and separated from alumina, improving the purity of the final product.

[0003] During the above-mentioned crushing and screening process of bauxite, it is relatively easy to screen and remove some large impurities with larger volumes. However, it is difficult to perform pre-screening treatment in advance for other impurities in bauxite that affect the purity of alumina preparation. For example, bauxite contains impurities such as Na2O, Fe2O3, SiO2, CaO, and MgO. These oxides are usually mixed in bauxite in the form of particles or powders. As the bauxite enters the subsequent operation steps for treatment, pre-screening the crushed bauxite can not only reduce the amount of solutions or solvents used for cleaning these impurities in the subsequent process, but also improve the purity of the finally prepared alumina. In addition, for some oxide impurities in bauxite, a large amount of heat will be generated when rinsing with water, thus affecting the use of equipment. Summary of the Invention

[0004] In order to solve the problems that it is difficult to screen the impurities attached to bauxite more thoroughly during the current crushing and screening process of bauxite, and a large amount of heat generated when rinsing bauxite with water affects the practical use of equipment, the present invention provides an impurity treatment device for alumina production. When coarsely crushing bauxite, it can perform pre-screening and filtering treatment on the particles and powder impurities attached to the surface of bauxite, reduce the amount of solutions or solvents used for treating impurities in the subsequent process, improve the purity of the prepared alumina, and prevent the heat generated when rinsing bauxite with water from affecting the use of equipment.

[0005] The technical solution adopted by the present invention is as follows:

[0006] There is provided an impurity treatment device for alumina production, comprising:

[0007] A housing having a feed inlet at its top and a discharge outlet at its bottom, with a feed hopper provided at the top of the housing and located within the feed inlet; a filter cartridge disposed on the inner wall surface of the housing, the top opening of the filter cartridge being located at the bottom of the feed hopper, a fixing column being provided inside the filter cartridge, a spiral slide plate being provided on the outer wall surface of the fixing column along the direction of its central axis, the outer wall surface of the slide plate being connected to the inner wall surface of the filter cartridge, and a transition cavity being formed inside the slide plate; a plurality of inclined blocks, each inclined block being distributed on the top surface of the slide plate along the central axial direction of the fixing column, and each inclined block being inclined towards the bottom of the filter cartridge, a sieve hole communicating with the transition cavity being formed at one end of each inclined block facing the top of the filter cartridge; a first conveying mechanism disposed on the inner wall surface of the housing and located below the filter cartridge for conveying bauxite; a sieve plate disposed on the inner wall surface of the housing and located at the output end of the first conveying mechanism for filtering and screening bauxite; a water tank disposed at the inner bottom of the housing for soaking the bauxite screened on the sieve plate, and a second conveying mechanism being provided inside the water tank for conveying the bauxite in the water tank outside the water tank.

[0008] Optionally, a plurality of through holes are inclinedly formed inside the side wall of the filter cartridge, the central axis of each through hole being inclined towards the central axis of the fixing column, and a dust collector is provided on the outer wall surface of the housing, the suction port of the dust collector being communicated with each through hole through a pipeline.

[0009] Optionally, a chute is formed on the inner wall surface of the housing, and a slide bar located in the chute is provided on the outer wall surface of the filter cartridge, such that the filter cartridge is slidably connected to the inner wall surface of the housing; a support plate is further provided on the inner wall surface of the housing, a telescopic mechanism is provided at the top of the support plate, and the working end of the telescopic mechanism is connected to the slide bar for driving the filter cartridge to move up and down in the vertical direction.

[0010] Optionally, a baffle is provided on the inner wall surface of the housing and located directly above the first conveying mechanism, such that the bottom of the filter cartridge periodically collides with the baffle.

[0011] Optionally, a support rod is provided on the inner wall surface of the housing, and the sieve plate is rotatably connected to the outer wall surface of the support rod.

[0012] Optionally, a first connecting rod is further provided on the inner wall surface of the housing, a rotating rod is rotatably connected to the outer wall surface of the first connecting rod, one end of the rotating rod is hinged to a second connecting rod, the other end is hinged to a third connecting rod, the other end of the second connecting rod is connected to the outer wall surface of the filter cartridge, and the other end of the third connecting rod is connected to the outer wall surface of the sieve plate; wherein, when the filter cartridge collides with the baffle, one end of the sieve plate facing the first conveying mechanism is higher than the other end of the sieve plate.

[0013] Optionally, a heat exchanger is provided on the outer wall surface of the water tank, an exhaust port is formed at the top of the water tank, and a pump body communicated with the exhaust port is provided on the outer wall surface of the housing for absorbing the heat generated inside the water tank.

[0014] Optionally, an air suction fan is provided on the inner wall surface of the housing, and the inlet of the air suction fan is located directly above the first conveying mechanism.

[0015] Optionally, the first conveying mechanism is a belt conveyor mechanism, and the second conveying mechanism is a belt conveyor mechanism.

[0016] Optionally, a collection box is provided at the inner bottom of the housing.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By putting the bauxite after coarse crushing into the feed hopper at the feed inlet of the housing, the bauxite is conveyed into the filter cartridge inside the housing by the feed hopper. The bauxite entering the filter cartridge can fall in a spiral along the slide plate. During the falling process of the bauxite, since a plurality of inclined blocks are provided on the top surface of the slide plate, and each inclined block is inclined towards the bottom of the filter cartridge, the bauxite will collide with the inclined blocks during the falling process. During the collision process, some impurity particles with smaller particle sizes can enter the transition cavity opened inside the slide plate through the sieve holes opened at one end of the inclined block towards the top of the filter cartridge for temporary storage. In addition, some powdery impurities can also enter the transition cavity inside the slide plate through the sieve holes for temporary storage. That is, during the falling process of the bauxite, some particles or powdery impurities attached to the surface of the bauxite can be pre-screened and stored.

[0019] 2. A water tank is provided inside the housing. When the bauxite falls from the bottom of the filter cartridge onto the first conveying mechanism and is conveyed by the first conveying mechanism to the sieve plate, the particles or powdery impurities still attached to the bauxite are filtered for the second time. At this time, after the bauxite passes through the second filtration of the sieve plate, the bauxite enters the inside of the water tank from the sieve plate. The bauxite entering the water tank will undergo immersion and washing treatment, and this process can remove the particles or powdery impurities still remaining on the surface of the bauxite. Finally, the bauxite is sent out of the water tank by the second conveying mechanism in the water tank for subsequent corresponding operations on the bauxite. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a front view structural schematic diagram of an impurity treatment device for alumina production;

[0022] Figure 2 For Figure 1Top view structural schematic diagram;

[0023] Figure 3 is Figure 1 Partial enlarged schematic diagram at position A in

[0024] Figure 4 is Figure 1 Partial enlarged schematic diagram at position B in

[0025] Reference numerals:

[0026] 1 - housing, 10 - feed inlet, 11 - discharge outlet, 12 - support rod, 13 - first connecting rod, 14 - support plate, 15 - baffle, 16 - chute; 2 - feed hopper;

[0027] 3 - filter cartridge, 30 - fixing column, 31 - sliding plate, 310 - inclined block, 3101 - sieve hole, 311 - transition cavity, 32 - sliding rod, 33 - through hole; 4 - first conveying mechanism;

[0028] 5 - sieve plate, 50 - second sieve hole;

[0029] 6 - water tank, 60 - exhaust port, 61 - heat exchanger; 7 - second conveying mechanism, 8 - collection box, 9 - vacuum cleaner. Detailed implementation manners

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] The following disclosure provides many different implementation manners or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0032] The embodiments of the invention will be described in detail below with reference to the drawings.

[0033] Embodiment

[0034] As Figure 1As shown in the figure, an impurity treatment device for alumina production includes a housing 1. There is a feed inlet 10 at the top of the housing 1 and a discharge outlet 11 at the bottom. The feed inlet 10 is used to send the crushed bauxite into the interior of the housing 1, and the discharge outlet 11 is used to discharge and collect the impurities screened from the surface of the bauxite. A feed hopper 2 is arranged at the top of the housing 1. The inlet of the feed inlet 10 faces the outside of the housing 1, and the outlet of the feed inlet 10 faces the inside of the housing 1. The feed hopper 2 is used to gather the bauxite entering the housing 1 and then discharge it from the outlet of the feed hopper 2. The discharged bauxite then enters a filter cartridge 3 arranged inside the housing 1. The middle of the filter cartridge 3 is hollowed out, and the outer wall surface of the filter cartridge 3 is connected to the inner wall surface of the housing 1. A fixed column 30 is coaxially arranged inside the filter cartridge 3. A slide plate 31 is arranged on the outer wall surface of the fixed column 30. The slide plate 31 can enable the bauxite entering the filter cartridge 3 to continue to fall and move. It should be noted here that the overall shape of the cross plate is spiral and it winds around the outer wall surface of the fixed column 30, so that a spiral channel is formed between the slide plate 31, the fixed column 30 and the filter cartridge 3, and this spiral channel is used for the transportation of bauxite.

[0035] A transition cavity 311 is opened inside the above-mentioned slide plate 31. And on the top surface of the slide plate 31, that is, when the bauxite is transported in the spiral channel, a plurality of inclined blocks 310 are arranged on the surface where the slide plate 31 is in rolling contact with the bauxite. The inclined blocks 310 are in the shape of a right-angled triangular prism as a whole. The inclined surface of each inclined block 310 inclines towards the bottom of the filter cartridge 3, so that when the bauxite enters the filter cartridge 3, the particulate impurities on the surface of the bauxite can be blocked by the inclined blocks 310. Sieve holes 3101 are opened on the blocking surface of each inclined block 310 facing the top of the filter cartridge 3. The sieve holes 3101 are communicated with the transition cavity 311, and the blocked particulate impurities can enter the transition cavity 311 through the sieve holes 3101 for collection. It should be noted that the size of the inclined blocks 310 is not large, and the aperture of the sieve holes 3101 opened on the blocking surface of the inclined blocks 310 only needs to meet the requirement that the particulate impurities can enter, and the blocking surface of the inclined blocks 310 will not affect the rolling of the bauxite in the filter cartridge 3. Thus, the particulate impurities attached to the bauxite are screened and stored. For the slide plate 31 after storing a certain amount of particulate impurities, it needs to be cleaned and replaced. For this, the slide plate 31 can be removed from the outer wall surface of the fixed column 30 for replacement. The replacement method is that the connection between the slide plate 31 and the outer wall surface of the fixed column 30 is detachable. The specific detachable connection method can be snap connection, etc., as long as it is convenient to replace the slide plate 31.

[0036] A first conveying mechanism 4 is arranged on the inner wall surface of the housing 1. The first conveying mechanism 4 is specifically a belt conveyor mechanism and is located directly below the filter cartridge 3. When the bauxite is conveyed out from the spiral channel inside the filter cartridge 3, the bauxite at this time will fall onto the first conveying mechanism 4, and the first conveying mechanism 4 conveys the preliminarily screened bauxite to the output end, and then outputs and drops from the output end of the first conveying mechanism 4 onto the sieve plate 5 arranged on the inner wall surface of the housing 1, and the sieve plate 5 performs secondary screening. It should be noted that the sieve plate 5 is inclined on the inner wall surface of the housing 1, which can facilitate the bauxite to roll spontaneously on the sieve plate 5 due to its own gravity.

[0037] A water tank 6 is arranged at the inner bottom of the above-mentioned housing 1. The water tank 6 is filled with clean water. The output end of the above-mentioned sieve plate 5 extends into the interior of the water tank 6, which can convey the bauxite after secondary screening on the sieve plate 5 into the interior of the water tank 6, and the clean water in the water tank 6 rinses the surface of the bauxite. The bauxite entering the water tank 6 is soaked and cleaned by the clean water, and the particulate impurities and powdery impurities still attached to the bauxite can be cleaned. In this process, since some powdery impurities will release heat after being soaked in water, the temperature inside the water tank 6 will rise. For this reason, an exhaust port 60 is opened at the top of the water tank 6, and a pump body is connected to the exhaust port 60. The pump body recovers and utilizes the heat generated inside the water tank 6. In addition, a heat exchanger 61 is arranged on the side wall surface of the water tank 6. The heat exchanger 61 can reduce the temperature of the clean water in the water tank 6, and the absorbed heat can be recovered through subsequent operations to prevent the internal environment of the water tank 6 and the equipment inside the housing 1 from being affected due to the gradual increase in the temperature inside the water tank 6. Finally, the second conveying mechanism 7 arranged inside the water tank 6 conveys the bauxite in the water tank 6 and passes through subsequent operations.

[0038] Embodiment 2

[0039] This embodiment is a further optimization based on Embodiment 1. Specifically, as Figures 1-4 shown, a plurality of through holes 33 are opened inside the side wall of the filter cartridge 3. Each through hole 33 connects the internal space of the filter cartridge 3 and the internal space of the housing 1. Then, a vacuum cleaner 9 is arranged on the outer wall surface of the housing 1, and the pipeline of the vacuum cleaner 9 is connected to the through hole 33 on the outer wall surface of the filter cartridge 3 through the side wall of the housing 1. When the bauxite is rolling and screening inside the filter cartridge 3, the powdery impurities attached to the surface of the bauxite will generate dust when rolling in the spiral channel. Such dust can be absorbed and collected by the vacuum cleaner 9 through the through hole 33, preventing the working environment inside the housing 1 from being greatly affected.

[0040] A chute 16 is formed on the inner wall surface of the housing 1. The chute 16 is formed in a direction perpendicular to the bottom of the housing 1. A sliding rod 32 is provided on the outer wall surface of the filter cartridge 3. The sliding rod 32 is slidably connected to the inner wall surface of the housing 1 through the chute 16, so that the filter cartridge 3 can move up and down vertically inside the housing 1. The purpose is to shake and clean the particulate impurities on the slide plate 31 inside the filter cartridge 3 to prevent the particulate impurities from clogging the sieve holes 3101. In addition, to reduce the operation of manually holding the filter cartridge 3 by the staff to move it up and down to complete the shaking and sieving operation, a support plate 14 is provided on the inner wall surface of the housing 1. The support plate 14 is located directly above the first conveying mechanism 4 and below the filter cartridge 3, and the support plate 14 does not affect the bauxite from falling onto the first conveying mechanism 4. A telescopic mechanism is provided on the top of the support plate 14. The telescopic mechanism can specifically be a telescopic rod. The telescopic end of the telescopic rod is connected to the sliding rod 32. By adjusting the telescopic rod, the up and down movement of the sliding rod 32 can be adjusted, so as to realize the up and down movement adjustment of the filter cartridge 3 and complete the shaking and sieving operation.

[0041] In order to enhance the shaking and sieving effect when the first sieve holes 3101 at the inclined blocks 310 on the surface of the slide plate 31 are blocked, a baffle 15 is also provided on the inner wall surface of the housing 1. The baffle 15 is also located between the filter cartridge 3 and the first conveying mechanism 4, and the baffle 15 does not affect the bauxite from falling onto the first conveying mechanism 4. When the filter cartridge 3 moves up and down, the bottom of the filter cartridge 3 can make periodic collision contact with the baffle 15. During the collision, the filter cartridge 3 can be made to have a relatively strong shaking effect, thereby enhancing the shaking and sieving effect at the first sieve holes 3101.

[0042] A support rod 12 is provided on the inner wall surface of the above-mentioned housing 1. The support rod 12 is located above the first conveying mechanism 4. A sieve plate 5 is rotatably connected to the outer wall surface of the support rod 12, so that the sieve plate 5 can rotate along the support rod 12. Then a first connecting rod 13 is provided on the inner wall surface of the housing 1. A rotating rod is rotatably connected to the outer wall surface of the first connecting rod 13. One end of the rotating rod is hinged to a second connecting rod, and the other end is hinged to a third connecting rod. The other end of the second connecting rod is hinged to the outer wall surface of the filter cartridge 3, and the other end of the third connecting rod is hinged to the outer wall surface of the sieve plate 5. When the filter cartridge 3 moves up and down, the rotating rod can be driven to rotate through the second connecting rod, and the rotating rotating rod can drive the sieve plate 5 to rotate through the third connecting rod, which can not only adjust the inclination angle of the sieve plate 5, but also have the effect of shaking and sieving the sieve plate 5.

[0043] An air suction fan is arranged on the inner wall surface of the above-mentioned housing 1. The air suction fan is located directly above the first conveying mechanism 4 and can absorb dust from the bauxite conveyed on the first conveying mechanism 4, avoiding excessive dust filling the internal environment of the housing 1. In addition, for the convenience of collecting the screened granular impurities, etc., a collection box 8 is arranged inside the housing 1. The collection box 8 is communicated with the discharge port 11 of the housing 1 to facilitate the collection of granular impurities.

[0044] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Without conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An impurity treatment device for alumina production, characterized in that, Comprising: A housing having a feed inlet at the top and a discharge outlet at the bottom, and a feed hopper located within the feed inlet is provided at the top of the housing; A filter cartridge provided on the inner wall surface of the housing, the top opening of the filter cartridge being located at the bottom of the feed hopper. A fixing column is provided inside the filter cartridge, and a spiral slide plate is provided on the outer wall surface of the fixing column along the central axis direction of the fixing column. The outer wall surface of the slide plate is connected to the inner wall surface of the filter cartridge, and a transition cavity is formed inside the slide plate; A plurality of inclined blocks, each inclined block being distributed on the top surface of the slide plate along the central axial direction of the fixing column, and each inclined block being inclined towards the bottom of the filter cartridge. A sieve hole communicating with the transition cavity is formed at one end of each inclined block facing the top of the filter cartridge; a first conveying mechanism is provided on the inner wall surface of the housing and located below the filter cartridge for conveying bauxite; A sieve plate is provided on the inner wall surface of the housing and located at the output end of the first conveying mechanism for filtering and screening bauxite; a water tank is provided at the inner bottom of the housing for soaking the bauxite screened on the sieve plate. A second conveying mechanism is provided inside the water tank for conveying the bauxite in the water tank to the outside of the water tank.

2. The impurity treatment device for alumina production according to claim 1, wherein, A plurality of through holes are inclinedly formed inside the side wall of the filter cartridge, and the central axis of each through hole is inclined towards the central axis of the fixing column. A dust collector is provided on the outer wall surface of the housing, and the suction inlet of the dust collector is communicated with each through hole through a pipeline.

3. The impurity treatment device for alumina production according to claim 2, wherein, A chute is formed on the inner wall surface of the housing, and a sliding rod located in the chute is provided on the outer wall surface of the filter cartridge, so that the filter cartridge is slidably connected to the inner wall surface of the housing; a support plate is further provided on the inner wall surface of the housing, and a telescopic mechanism is provided on the top of the support plate. The working end of the telescopic mechanism is connected to the sliding rod for driving the filter cartridge to move up and down in the vertical direction.

4. The impurity treatment device for alumina production according to claim 3, wherein, A baffle is provided on the inner wall surface of the housing and located directly above the first conveying mechanism, so that the bottom of the filter cartridge collides with the baffle periodically.

5. The impurity treatment device for alumina production according to claim 4, characterized in that, A support rod is provided on the inner wall surface of the housing, and the sieve plate is rotatably connected to the outer wall surface of the support rod.

6. The impurity treatment device for alumina production according to claim 5, wherein, A first connecting rod is further provided on the inner wall surface of the housing. A rotating rod is rotatably connected to the outer wall surface of the first connecting rod. One end of the rotating rod is hinged to a second connecting rod, and the other end is hinged to a third connecting rod. The other end of the second connecting rod is connected to the outer wall surface of the filter cartridge, and the other end of the third connecting rod is connected to the outer wall surface of the sieve plate; wherein, when the filter cartridge collides with the baffle, one end of the sieve plate facing the first conveying mechanism is higher than the other end of the sieve plate.

7. The impurity treatment device for alumina production according to claim 1 or 6, characterized in that, A heat exchanger is provided on the outer wall surface of the water tank, an exhaust port is formed at the top of the water tank, and a pump body communicated with the exhaust port is provided on the outer wall surface of the housing for absorbing the heat generated in the water tank.

8. The impurity treatment device for alumina production according to claim 7, characterized in that, An air blower is provided on the inner wall surface of the housing, and the inlet of the air blower is located directly above the first conveying mechanism.

9. The impurity treatment device for alumina production according to claim 8, wherein, The first conveying mechanism is a belt conveyor, and the second conveying mechanism is a belt conveyor.

10. The impurity treatment device for alumina production according to claim 9, wherein, A collection box is provided at the inner bottom of the housing.

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