Feeding assembly and device for improving leaching efficiency of aluminum oxide recovered from aluminum ash through alkaline leaching method

Abstract

The invention provides a feeding assembly and device for improving the leaching efficiency of aluminum oxide recovered from aluminum ash through an alkaline leaching method, and belongs to the technical field of aluminum ash treatment. The feeding assembly comprises a material distribution cabin and a gas mixing cabin. The material distribution cabin comprises a first cabin body, a top cover and a powder distribution piece. An annular air storage chamber is arranged on the lower portion of the outer side wall of the first cabin body, and a first annular narrow slit is formed in the side wall, corresponding to the annular air storage chamber, of the first cabin body. The powder distribution piece is detachably arranged on the inner side of the bottom of the opening of the first cabin body in a matched mode, and the upper surface of the powder distribution piece is flush with the plane where the center of the first annular narrow slit in the height direction is located. And a plurality of groups of through powder distribution holes which are arranged in a concentric circle manner are formed in the powder distribution piece by taking the axial center of the powder distribution piece as the center. The device comprises the feeding assembly. According to the feeding assembly and device, aluminum ash or aluminum ash calcined clinker can make contact with leaching alkali liquor in a looser mode, the powder agglomeration phenomenon is reduced, and the leaching efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum ash treatment, and in particular to a feeding component and a device for improving the leaching efficiency of aluminum oxide recovered from aluminum ash by an alkaline leaching method. Background Art

[0002] At present, the main methods for recovering alumina from aluminum ash include acid method, alkali smelting method, alkali leaching method and ammonium aluminum carbonate method. Among them, the alkali leaching method uses the aluminum and alumina in the aluminum ash to dissolve in NaOH solution to form AlO 2- 、AlO3 - , then recover aluminum hydroxide through crystallization / precipitation and other methods, and finally calcine at high temperature to generate aluminum oxide.

[0003] For example, a Chinese invention application (name: "Method for preparing alumina using aluminum ash", publication number: CN111960450A, publication date: 20201120) discloses a method for preparing alumina using aluminum ash, comprising the following steps: 10 parts by weight of aluminum ash, 12 parts of red mud, 20 parts of fly ash or coal gangue, 45 parts of limestone or carbide slag, 5 parts of iron powder, and 8 parts of soda ash are mixed and ground evenly, then calcined in a rotary kiln, and then the kiln materials are evenly mixed. The materials are evenly distributed into two single-drum coolers for cooling. The materials cooled in the two single-drum coolers are then screened separately. The materials on the screen are crushed by a first-stage high-temperature roller crusher and then conveyed to a second-stage high-temperature roller crusher together with the materials under the screen for crushing. Finally, the materials are cooled in a G-type cooler to obtain alumina clinker. The alumina clinker is dissolved in alkali solution and then solid-liquid separation is performed to obtain a sodium aluminate solution. Carbon dioxide gas is introduced into the sodium aluminate solution and filtered to obtain aluminum hydroxide. Alumina is obtained by calcining aluminum hydroxide.

[0004] The aluminum oxide recovered from aluminum ash by alkali leaching has high purity and low impurity content, but the initial contact and mixing state of aluminum ash or aluminum ash calcined clinker with alkali solution will directly affect the leaching efficiency. In the prior art, most of them adopt the method of one-time feeding or multiple dispersed feeding, but aluminum ash or aluminum ash calcined clinker still has agglomeration phenomenon after one-time feeding or multiple dispersed feeding, and dispersed contact needs to be completed before leaching can be achieved, and the leaching efficiency is difficult to guarantee. Summary of the invention

[0005] The present invention aims to provide a feeding component and device for improving the leaching efficiency of recovering alumina from aluminum ash by alkali leaching. Aluminum ash or aluminum ash calcined clinker contacts with leaching alkali solution in a looser manner, reducing powder agglomeration and improving leaching efficiency.

[0006] The technical solution adopted by the present invention is: A feeding assembly for improving the leaching efficiency of aluminum oxide recovered from aluminum ash by alkaline leaching, comprising: A distribution cabin, which is connected to the discharge end of the aluminum ash temporary storage tank or the aluminum ash calcined clinker temporary storage tank; An air mixing cabin, the air mixing cabin being arranged below the material distribution cabin; Wherein, the material distribution cabin comprises: A straight-cylindrical first cabin body is provided with a material receiving pipe at the upper part of the outer wall of the first cabin body; an annular air storage chamber is provided at the lower part of the outer wall of the first cabin body, and the annular air storage chamber has an air inlet interface; and a first annular narrow slit is provided on the side wall of the first cabin body corresponding to the annular air storage chamber; A top cover, the top cover is detachably arranged on the open top of the first cabin body; A disc-shaped powder distribution piece is detachably arranged on the inner side of the open bottom of the first chamber body; the upper surface of the powder distribution piece is flush with the plane where the center of the height direction of the first annular narrow slit is located; the powder distribution piece is provided with a plurality of groups of through powder distribution holes arranged in a concentric circle manner with its own axial center as the center.

[0007] Furthermore, a number of clamping rods are evenly arranged vertically near the edge of the lower surface of the top cover; an annular baffle is formed on the inner side of the open bottom of the first cabin body along the circumferential direction; the powder distribution piece is placed on the annular baffle; a number of positioning blind holes evenly arranged in a circular manner are also opened near the edge of the upper surface of the powder distribution piece; wherein, when the top cover is connected to the first cabin body, the lower ends of the clamping rods are inserted into the positioning blind holes one by one, and cooperate with the annular baffle to tighten the powder distribution piece.

[0008] Furthermore, along the through direction of the powder distribution hole, from top to bottom, the powder distribution hole includes a first conical hole segment, a cylindrical hole segment and a second conical segment, and the sizes of the first conical hole segment and the second conical segment gradually shrink to the same size as the cylindrical hole segment.

[0009] Furthermore, a linear air guide groove is opened on the upper surface of the powder distribution piece along its own radial direction, and the linear air guide groove starts from the edge of the powder distribution piece and ends at the center position of the powder distribution piece; at the same time, an annular air guide groove is opened on the upper surface of the powder distribution piece along the circumferential direction of multiple groups of powder distribution holes arranged in a concentric circle manner, and the annular air guide groove intersects with the linear air guide groove.

[0010] Furthermore, a hydraulic cylinder is vertically arranged in the middle of the outer surface above the top cover, and the piston rod of the hydraulic cylinder passes through the middle of the powder distribution hole along the direction coinciding with the axial center of the first cabin body, and extends to the bottom of the open opening of the first cabin body; a circular grille plate is arranged at the lower end of the piston rod, and the circular grille plate is parallel to the powder distribution part; a top block matching the lower part of the corresponding powder distribution hole is arranged on the upper surface of the circular grille plate at a position corresponding to each powder distribution hole.

[0011] Furthermore, one or a bundle of steel wires is arranged on the top of each top block and is passed through the corresponding powder distribution hole; the diameter of a single steel wire or a single bundle of steel wires is smaller than the aperture of the powder distribution hole, and the straight length thereof should be sufficient to ensure that when the top block moves to the maximum distance from the powder distribution hole as the lower end of the piston rod moves, the steel wire cannot fall out of the powder distribution hole.

[0012] Furthermore, the gas mixing cabin includes a second cabin body that is straight-cylindrical and penetrates from top to bottom; the open top of the second cabin body is connected to the fabric cabin; an annular liquid storage chamber is provided on the outer side wall of the second cabin body, and the annular liquid storage chamber has a liquid inlet interface; at the same time, a second annular narrow slit is provided on the side wall of the second cabin body corresponding to the annular liquid storage chamber.

[0013] Furthermore, a plurality of spiral guide grooves are formed on the inner side wall of the second cabin body from the lower edge of the second annular narrow slit to the open bottom of the second cabin body.

[0014] Furthermore, a wind fan blade is provided at a central position in the second cabin body.

[0015] Based on the same inventive concept, the present invention also provides a device for improving the leaching efficiency of recovering aluminum oxide from aluminum ash by alkaline leaching, comprising: A mixing kettle, wherein an agitator is provided inside the mixing kettle, a stirring motor is provided outside the mixing kettle, and the agitator is connected to the stirring motor; an external circulation pump is also provided outside the mixing kettle, an input end of the external circulation pump is connected to the lower part of the outer side wall of the mixing kettle, and an output end of the external circulation pump is connected to the upper part of the outer side wall of the mixing kettle; One or more feeding components as described above for improving the leaching efficiency of recovering alumina from aluminum ash by alkaline leaching.

[0016] The beneficial effects of the present invention are: The present invention designs a feeding assembly and device for improving the leaching efficiency of recovering alumina from aluminum ash by alkali leaching. The feeding assembly and device are connected to the gas generator through the air inlet interface of the annular air storage chamber, and then released from the first annular narrow slit to form an air cushion layer near the upper surface of the powder distribution piece, so as to prevent aluminum ash or aluminum ash calcined clinker from directly accumulating on the upper surface of the powder distribution piece and blocking the powder distribution holes, and to be loosely accumulated in the first chamber body; at the same time, the continuously introduced air drives the aluminum ash or aluminum ash calcined clinker to spray out from the powder distribution holes, so as to contact the leaching alkali solution in the form of dispersed powder, reduce agglomeration, and improve the leaching efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a front view of a feeding assembly for improving the leaching efficiency of recovering alumina from aluminum ash by alkaline leaching in an embodiment.

[0019] Figure 2 Figure 1 AA section view.

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the feeding assembly for improving the efficiency of recovering aluminum oxide from aluminum ash by alkaline leaching in the embodiment Figure 1 .

[0021] Figure 4 Schematic diagram of the three-dimensional structure of the feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching in the embodiment Figure 2 .

[0022] Figure 5 It is a schematic diagram of the combined structure of the hydraulic cylinder, the circular grid plate and the top block in the embodiment.

[0023] Figure 6 The three-dimensional structure of the powder distribution part of this embodiment is shown in FIG. Figure 1 .

[0024] Figure 7 The three-dimensional structure of the powder distribution part of this embodiment is shown in FIG. Figure 2 The accompanying drawings are marked as follows: 100- material distribution cabin, 110- first cabin body, 111- annular baffle, 120- top cover, 121- clamping rod, 130- hydraulic cylinder, 131- piston rod, 140- material receiving pipe, 150- annular air storage chamber, 151- air inlet interface, 152- first annular narrow slit, 160- powder distribution part, 161- through hole, 162- powder distribution hole, 163- linear air guide groove, 164- annular air guide groove, 170- circular grille plate, 171- top block, 172- steel wire.

[0025] 200 - air mixing chamber, 210 - second chamber body, 211 - second annular narrow slit, 212 - guide groove, 220 - annular liquid storage chamber, 221 - liquid inlet interface. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0027] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention.

[0028] The embodiments of the invention are described in detail below with reference to the accompanying drawings.

[0029] Example 1

[0030] Figure 1 It is a front view of a feeding assembly for improving the leaching efficiency of recovering alumina from aluminum ash by alkaline leaching in an embodiment. Figure 2 Figure 1 AA section view. Figure 3 Schematic diagram of the three-dimensional structure of the feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching in the embodiment Figure 1 . Figure 4 Schematic diagram of the three-dimensional structure of the feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching in the embodiment Figure 2 .like Figures 1 to 4 As shown in , the feeding assembly includes a distribution cabin 100, and the distribution cabin 100 is connected to the discharge end of the aluminum ash temporary storage tank or the aluminum ash calcined clinker temporary storage tank.

[0031] Specifically, the material distribution cabin 100 includes a first cabin body 110 that is through-through and has a straight cylindrical shape; a top cover 120 is provided on the open top of the first cabin body 110, and the top cover 120 is flange-connected to the first cabin body 110, and a plurality of clamping rods 121 are evenly and vertically arranged near the edge of the lower surface of the top cover 120; a material receiving pipe 140 is provided on the upper part of the outer wall of the first cabin body, and one end of the material receiving pipe 140 is flange-connected to the discharge end of the aluminum ash temporary storage tank or the aluminum ash calcined clinker temporary storage tank, and the other end of the material receiving pipe 140 is communicated with the interior of the first cabin body 110; an annular air storage chamber 150 is provided on the lower part of the outer wall of the first cabin body 110, and the annular air storage chamber 150 has an air inlet interface 151, and a height of about 0.1~1 is opened on the side wall of the first cabin body 110 corresponding to the annular air storage chamber 150 The first annular slit 152 of mm is provided, and the first annular slit 152 makes the interior of the annular air storage chamber 150 communicate with the internal area of ​​the first cabin body 110; an annular baffle 111 is formed on the inner side of the open bottom of the first cabin body 110 along the circumferential direction, and a disc-shaped powder distribution piece 160 is arranged on the annular baffle 111, and the diameter of the powder distribution piece 160 is roughly consistent with the inner diameter of the first cabin body 110, and the height of the powder distribution piece 160 is roughly consistent with the distance between the center of the height direction of the first annular slit 152 and the upper surface of the annular baffle 111; with the axial center of the powder distribution piece 160 as the center, the powder distribution piece 160 is provided with a plurality of groups of through powder distribution holes 162 arranged in a concentric circle manner, and a plurality of positioning blind holes 163 evenly arranged in a circular manner are also provided near the edge of the upper surface of the powder distribution piece 160. When the top cover 120 and the first cabin body 110 are flange-connected, the lower ends of the clamping rods 121 are inserted into the positioning blind holes 163 one by one, and cooperate with the annular stop 111 to clamp the powder distributing member 160 .

[0032] In the present embodiment, the air inlet interface 151 of the annular air storage chamber 150 is connected to a gas generator (such as an air compressor, etc.), and then the air is released from the first annular narrow slit 152 to form an air cushion layer near the upper surface of the powder distribution member 160, thereby preventing aluminum ash or aluminum ash calcined clinker from directly accumulating on the upper surface of the powder distribution member 160 and blocking the powder distribution hole 161, and being loosely accumulated in the first cabin body 110; at the same time, the continuously introduced air drives the aluminum ash or aluminum ash calcined clinker to be ejected from the powder distribution hole 162, so as to contact the leaching alkali solution in a dispersed powder form, reduce the agglomeration of the powder, and improve the leaching efficiency.

[0033] In this embodiment, Figure 2As shown in , along the through direction of the powder distribution hole 162, from top to bottom, the powder distribution hole 162 includes a first conical hole section, a cylindrical hole section, and a second conical section, and the size of the first conical hole section and the second conical section gradually shrinks to the same size as the cylindrical hole section. In this embodiment, the three sections of the first conical hole section, the cylindrical hole section, and the second conical section make the powder distribution hole 162 form a necking structure, which is conducive to the accelerated ejection of aluminum ash or aluminum ash calcined clinker from the powder distribution hole 162.

[0034] Figure 6 The three-dimensional structure of the powder distribution part of this embodiment is shown in FIG. Figure 1 . Figure 7 The three-dimensional structure of the powder distribution part of this embodiment is shown in FIG. Figure 2 .like Figure 6 and Figure 7 As shown in , the upper surface of the powder distributing member 160 is provided with a linear air guide groove 163 along its own radial direction, and the linear air guide groove 163 starts from the edge of the powder distributing member 160 and ends at the center of the powder distributing member 160; at the same time, the upper surface of the powder distributing member 160 is provided with an annular air guide groove 164 along the circumferential direction of the multiple groups of powder distributing holes 162 arranged in a concentric circle manner, and the annular air guide groove 164 intersects with the linear air guide groove 163. In this embodiment, the staggered annular air guide grooves 164, the linear air guide grooves 163 and the distribution holes 163 facilitate air to flow from the first annular narrow slit 152 to the central area of ​​the powder distributing member 160, covering the entire upper surface of the distribution member 160.

[0035] Figure 5 Schematic diagram of the combined structure of the hydraulic cylinder, the circular grid plate and the top block in the embodiment. Figure 5As shown in , a hydraulic cylinder 130 is vertically arranged in the middle of the outer surface above the top cover 120, and the piston rod 131 of the hydraulic cylinder 130 coincides with the direction of the axial center of the first cabin body 110. At the same time, a through hole 161 having a diameter roughly consistent with the diameter of the piston rod 131 is opened in the center of the powder distributing member 160, and the lower end of the piston rod 131 passes through the through hole 161 and extends to the bottom of the open opening of the first cabin body 110; a circular grid plate 170 is arranged at the lower end of the piston rod 131, and the circular grid plate 170 is roughly parallel to the powder distributing member 160, and the diameter of the circular grid plate 170 is smaller than the diameter of the powder distributing member 160; a conical top block 171 is arranged on the upper surface of the circular grid plate 170 at a position corresponding to each powder distributing hole 162, which cooperates with the second conical section at the lower part of the corresponding powder distributing hole 162. In this embodiment, when the hydraulic cylinder 130 drives the piston rod 131 to move back and forth along the axial center direction of the first cabin body 110, the top block 171 will gradually move toward the powder distribution hole 162 until the powder distribution hole 162 is completely blocked, and then move away from the powder distribution hole 162, and repeat this process. When the top block 171 blocks the powder distribution hole 162, the powder structure of the bridge in the powder distribution hole 162 can be destroyed by extrusion, and at the same time, the internal pressure in the first cabin body 110 is increased due to the continuous introduction of air within a certain period of time; when the top block 171 is away from the powder distribution hole 162, the aluminum ash or aluminum ash calcined clinker that flows rapidly with the air can collide violently with the top block 171 and be dispersed.

[0036] In this embodiment, Figure 2 As shown in , a steel wire 172 is disposed on the top of each top block 171 and is passed through the corresponding powder distribution hole 162; the diameter of the single steel wire 172 or the single steel wire 172 is smaller than the diameter of the cylindrical hole section of the powder distribution hole 162; the straight length of the single steel wire 172 or the single steel wire 172 should be sufficient to ensure that when the top block 171 moves to the maximum distance from the powder distribution hole 162 along with the lower end of the piston rod 131, the steel wire 172 cannot escape from the corresponding powder distribution hole 162. The other end of the steel wire 172 is freely or randomly connected to the inner wall of the first cabin body 110. In this embodiment, when the top block 171 moves back and forth up and down with the lower end of the piston rod 131, the steel wire 172 will scratch the inner wall of the powder distribution hole 162 to reduce the hole blockage phenomenon; at the same time, the steel wire 172 will undergo flexible deformation, interweaving and disturbing the aluminum ash or aluminum ash calcined clinker accumulated in the first cabin body 110, which is beneficial to the introduction of air to form loose aluminum ash or aluminum ash calcined clinker.

[0037] like Figures 1 to 4As shown in , the feeding assembly also includes an air-mixing cabin 200, which is arranged below the material distribution cabin 100. Specifically, the air-mixing cabin 200 includes a second cabin body 210 that is through and straight; the open top of the second cabin body 210 is flange-connected to the open bottom of the first cabin body 110; an annular liquid storage chamber 220 is arranged on the outer wall of the second cabin body 210 corresponding to the top block 171 when the lower end of the piston rod 131 moves to the maximum distance from the powder distribution hole 162, and the annular liquid storage chamber 220 has a liquid inlet interface 221; at the same time, a second annular narrow slit 211 with a height of about 0.1~5mm is opened on the side wall of the second cabin body 210 corresponding to the annular liquid storage chamber 220, and the second annular narrow slit 211 makes the interior of the annular liquid storage chamber 220 communicate with the internal area of ​​the second cabin body 210.

[0038] In this embodiment, the liquid inlet interface 221 of the annular liquid storage chamber 220 is connected to an external circulation pump to extract the leaching alkali solution in the mixing kettle. After the leaching alkali solution flows out from the second annular narrow slit 211, it flows along the inner wall of the second cabin body 210, and contacts and mixes with a part of the aluminum ash or aluminum ash calcined clinker evenly dispersed from the material distribution cabin 100, and the remaining aluminum ash or aluminum ash calcined clinker is stirred and mixed with the leaching alkali solution in the mixing kettle. Compared with one-time feeding or multiple feeding, the agglomeration phenomenon of aluminum ash or aluminum ash calcined clinker is reduced, and the leaching efficiency is improved. At the same time, when the leaching alkali solution falls along the inner wall of the second cabin body 210, a cylindrical liquid curtain area is formed, which has a certain restraining effect on the flying aluminum ash or aluminum ash calcined clinker, and reduces its flying in the mixing kettle.

[0039] In this embodiment, Figure 2 and Figure 4 As shown in the figure, a plurality of spiral guide grooves 212 are formed on the inner side wall of the second chamber body 210 from the lower edge of the second annular narrow slit 211 to the open bottom of the second chamber body 210. In this embodiment, the guide grooves 212 greatly increase the contact area between the aluminum ash or aluminum ash calcined clinker and the leaching alkali solution in the mixing kettle, thereby increasing the contact mixing time.

[0040] In this embodiment, Figure 2 and Figure 4 As shown in the figure, a wind fan blade (not shown in the figure) is provided at the center position of the corresponding top block 171 in the second cabin body 210 when the lower end of the piston rod 131 moves to the maximum distance from the powder distribution hole 162; the wind fan blade rotates due to the air blown out from the first cabin body 110, so that the aluminum ash or aluminum ash calcined clinker flowing with the air flows to the inner wall of the second cabin body 210, thereby increasing the mass of the aluminum ash or aluminum ash calcined clinker captured by the leaching alkali solution along the inner wall of the second cabin body 210.

[0041] Example 2

[0042] In this embodiment, a device for improving the leaching efficiency of recovering aluminum oxide from aluminum ash by alkaline leaching is provided. The device comprises a mixing kettle; a stirrer is provided inside the mixing kettle, a stirring motor is provided outside the mixing kettle, and the stirrer and the stirring motor are connected; an external circulation pump is also provided outside the mixing kettle, the input end of the external circulation pump is connected to the lower part of the outer wall of the mixing kettle, and the output end of the external circulation pump is connected to the upper part of the outer wall of the mixing kettle; at the same time, one or more feeding components as in Example 1 are also provided on the top of the mixing kettle, and the liquid inlet interface 221 of the annular liquid storage chamber 220 on the feeding component is also connected to the output end of the external circulation pump.

[0043] Compared with the method of one-time feeding or multiple dispersed feeding, the device in this embodiment can achieve the contact between aluminum ash or aluminum ash calcined clinker and the leaching alkali solution in a looser manner, reducing powder agglomeration and improving leaching efficiency.

Claims

1. A feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching, characterized in that: include: A distribution cabin, which is connected to the discharge end of the aluminum ash temporary storage tank or the aluminum ash calcined clinker temporary storage tank; An air mixing cabin, the air mixing cabin being arranged below the material distribution cabin; Wherein, the material distribution cabin comprises: A straight-cylindrical first cabin body is provided with a material receiving pipe at the upper part of the outer wall of the first cabin body; an annular air storage chamber is provided at the lower part of the outer wall of the first cabin body, and the annular air storage chamber has an air inlet interface; and a first annular narrow slit is provided on the side wall of the first cabin body corresponding to the annular air storage chamber; A top cover, the top cover is detachably arranged on the open top of the first cabin body; A disc-shaped powder distribution piece is detachably arranged on the inner side of the open bottom of the first chamber body; the upper surface of the powder distribution piece is flush with the plane where the center of the height direction of the first annular narrow slit is located; the powder distribution piece is provided with a plurality of groups of through powder distribution holes arranged in a concentric circle manner with its own axial center as the center.

2. The feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching according to claim 1 is characterized in that: A number of clamping rods are evenly arranged vertically near the edge of the lower surface of the top cover; an annular baffle is formed on the inner side of the open bottom of the first cabin body along the circumferential direction; the powder distribution piece is placed on the annular baffle; a number of positioning blind holes evenly arranged in a circular manner are also opened near the edge of the upper surface of the powder distribution piece; wherein, when the top cover is connected to the first cabin body, the lower ends of the clamping rods cooperate to be inserted into the positioning blind holes one by one, and cooperate with the annular baffle to tighten the powder distribution piece.

3. The feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching according to claim 1, characterized in that: Along the through direction of the powder distribution hole, from top to bottom, the powder distribution hole includes a first conical hole segment, a cylindrical hole segment and a second conical segment, and the sizes of the first conical hole segment and the second conical segment gradually shrink to the same size as the cylindrical hole segment.

4. The feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching according to claim 1, characterized in that: The upper surface of the powder distribution piece is provided with a linear air guide groove along its own radial direction, and the linear air guide groove starts from the edge of the powder distribution piece and ends at the center of the powder distribution piece; at the same time, the upper surface of the powder distribution piece is provided with annular air guide grooves along the circumferential direction of multiple groups of powder distribution holes arranged in a concentric circle manner, and the annular air guide grooves intersect with the linear air guide grooves.

5. The feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching according to claim 1, characterized in that: A hydraulic cylinder is vertically arranged in the middle of the outer surface above the top cover, and the piston rod of the hydraulic cylinder passes through the middle of the powder distribution hole along the direction coinciding with the axial center of the first cabin body, and extends to the bottom of the open opening of the first cabin body; a circular grid plate is arranged at the lower end of the piston rod, and the circular grid plate is parallel to the powder distribution part; a top block matching the lower part of the corresponding powder distribution hole is arranged on the upper surface of the circular grid plate at a position corresponding to each powder distribution hole.

6. The feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching according to claim 5, characterized in that: A steel wire or a bundle of steel wires is arranged on the top of each top block and is passed through the corresponding powder distribution hole; the diameter of a single steel wire or a single bundle of steel wires is smaller than the aperture of the powder distribution hole, and the straight length thereof should be sufficient to ensure that when the top block moves to the maximum distance from the powder distribution hole along with the lower end of the piston rod, the steel wire cannot fall out of the corresponding powder distribution hole.

7. The feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching according to any one of claims 1 to 6, characterized in that: The gas mixing cabin includes a second cabin body that is straight and passes through from top to bottom; the open top of the second cabin body is connected to the fabric cabin; an annular liquid storage chamber is provided on the outer side wall of the second cabin body, and the annular liquid storage chamber has a liquid inlet interface; at the same time, a second annular narrow slit is provided on the side wall of the second cabin body corresponding to the annular liquid storage chamber.

8. The feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching according to claim 7, characterized in that: A plurality of spiral guide grooves are formed on the inner side wall of the second cabin body from the lower edge of the second annular narrow slit to the open bottom of the second cabin body.

9. The feeding assembly for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching according to claim 7, characterized in that: A wind fan blade is arranged at the center of the second cabin body.

10. A device for improving the leaching efficiency of aluminum oxide from aluminum ash by alkaline leaching, characterized in that: include: A mixing kettle, wherein an agitator is provided inside the mixing kettle, a stirring motor is provided outside the mixing kettle, and the agitator is connected to the stirring motor; an external circulation pump is also provided outside the mixing kettle, an input end of the external circulation pump is connected to the lower part of the outer side wall of the mixing kettle, and an output end of the external circulation pump is connected to the upper part of the outer side wall of the mixing kettle; One or more feeding components for improving the leaching efficiency of alumina recovered from aluminum ash by alkaline leaching as described in any one of claims 1 to 9.

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