A preparation device and preparation method of nano silicon

Abstract

The present invention relates to the technical field of nano-silicon preparation, and specifically to a nano-silicon preparation device, comprising a drive box, a drive shaft being installed at the output end of the drive box, a plurality of dispersion disks being slidably arranged on the outer wall of the drive shaft, a sand milling tube being installed on the side wall of the drive box, a discharge assembly being arranged on the end of the sand milling tube away from the drive box, a sealing plate being slidably connected between the inner walls of the sand milling tube, a cylinder being rotatably connected to the side of the sealing plate close to the drive box, and the dispersion disks and the drive shaft being connected via a clamping piece. When the present invention is grinding nano-silicon, the sealing plate can be pushed by the cylinder to slide along the drive shaft, thereby adjusting the volume inside the sand milling tube, so that the large volume of the sand milling tube can be maintained when the material is dispersed, thereby improving the dispersion effect; while during grinding, the volume of the sand milling tube can be reduced, so that the concentration of the grinding medium in the sand milling tube can be increased, so that the probability of contact between the grinding medium and the material can be increased, thereby improving the grinding effect.

Description

Technical Field

[0001] The present invention relates to the technical field of nano-silicon preparation, and in particular to a nano-silicon preparation device and a nano-silicon preparation method. Background Art

[0002] During the preparation process, nanosilicon needs to be ground in a sand mill. Specifically, raw materials and grinding media, such as zirconium oxide beads, glass beads, or zirconium silicate beads, are added to the sand mill. A drive shaft then drives the dispersion disc and grinding media to rotate and grind the raw materials. However, the grinding chamber inside the existing sand mill is fixed and cannot be adjusted. Consequently, regardless of the amount of raw material, the sand mill must have the same volume for grinding. This results in lower grinding efficiency when the raw material is small. Therefore, the present invention has developed a nanosilicon preparation device to address this issue. Summary of the Invention

[0003] The object of the present invention is to provide a device and method for preparing nano-silicon, which can adjust the volume of a sand mill according to the amount of grinding raw materials, so that the grinding efficiency can be maintained at all times.

[0004] To achieve the above objectives, the first technical solution provided by the present invention is:

[0005] A device for preparing nano-silicon comprises a base, a driving box is provided on one side of the top of the base, the output end of the driving box passes through the driving box and is installed with a driving shaft, a plurality of dispersion disks are slidably provided on the outer wall of the driving shaft, a sanding cylinder is installed on the side wall of the driving box, and the driving shaft and the dispersion disk are located in the sanding cylinder, and a discharging assembly is provided on the end of the sanding cylinder away from the driving box, a sealing plate is slidably connected between the inner walls of the sanding cylinder, and the sealing plate is located on the same side of each dispersion disk and is arranged close to the driving box, the sealing plate is rotatably connected to a side of the driving box close to the driving box, and the fixed end of the cylinder is fixedly connected to the inner wall of the driving box, the sealing plate and adjacent dispersion disks and two adjacent dispersion disks are connected by multiple telescopic parts, each of the dispersion disks is connected to the driving shaft by a clamping part, and the cylinder pushes the sealing plate to slide toward the discharging assembly and unlocks each dispersion disk in turn.

[0006] Preferably, the clamping part includes an arc-shaped mounting groove opened on the surface of the dispersion disk, an extrusion block is slidably connected between the inner walls of the arc-shaped mounting groove, a clamping rod is fixed to the bottom of the extrusion block, and one end of the clamping rod is inserted into the drive shaft, a spring is sleeved on the outer wall of the clamping rod, and the spring is located below the extrusion block, and a clamping groove is opened on the outer wall of the drive shaft to cooperate with the clamping rod.

[0007] Preferably, each of the telescopic parts includes an arc-shaped sleeve installed on the surface of the dispersion disk, the inner wall of the arc-shaped sleeve is slidably connected to a arc-shaped slider, and one end of each arc-shaped slider is respectively fixed to the sealing plate and the adjacent dispersion disk, one of the arc-shaped sleeves is adapted to and connected to the arc-shaped mounting groove, and the arc-shaped slider on the arc-shaped sleeve is provided with a groove that cooperates with the clamping rod at one end close to the arc-shaped mounting groove, and is provided with an inclined slope.

[0008] Preferably, the arc-shaped mounting grooves on each of the dispersion discs are respectively arranged at different angles.

[0009] Preferably, a limiting block is provided on the outer wall of the arc-shaped sliding block, and a limiting ring cooperating with the limiting block is provided on the end of the arc-shaped sleeve.

[0010] Preferably, the cylinder and the sealing plate are rotatably connected via a rotating bearing, and the sealing plate is provided with an annular rotating groove that cooperates with the rotating bearing.

[0011] Preferably, the discharge assembly includes a discharge cover, the open end of the discharge cover is provided with a filter screen, one end of the discharge cover equipped with the filter screen is connected to the sanding cylinder and is detachably connected, and the bottom of the discharge cover is connected to a discharge pipe.

[0012] Preferably, the end of the driving shaft is equipped with a brush assembly that cooperates with the filter screen, and the brush assembly includes a reciprocating screw connected to the driving shaft, the reciprocating screw is rotatably connected to a sealing cover, and the sealing cover is connected to the inner wall of the sanding cylinder, the sealing cover is rotatably connected to a concave rotating cover at one end away from the driving shaft, the inner wall of the concave rotating cover is provided with an internal gear ring, the outer wall of the reciprocating screw is threadedly connected to a slider, and the slider is slidably connected to the inner wall of the sealing cover, an outer wall of one side of the slider is fixed with an L-shaped fixing rod, the outer wall of the L-shaped fixing rod is rotatably connected to a transition gear column, the outer wall of the end of the reciprocating screw is fixed with a driving gear meshed with the transition gear column, the transition gear column is intermittently meshed with the inner gear ring as the slider slides back and forth, and the end of the concave rotating cover is fixed with a brush that abuts against the filter screen.

[0013] Preferably, the end of the reciprocating screw is fixedly connected to a mounting plate, the mounting plate is connected to a dispersion disk through a telescopic part, the side wall of the sealing cover is fixedly connected to a fixing strip, the inner wall of the sanding cylinder is provided with a sliding groove that cooperates with the fixing strip, and the end of the sliding groove passes through the end of the sanding cylinder.

[0014] The second technical solution provided by the present invention is:

[0015] A method for preparing nano-silicon comprises the following steps:

[0016] S1. Add high-purity silicon powder to the dispersion tank of a primary sand mill, add appropriate solvent to adjust the solid content to 20-40 wt.%, and then add dispersant, wherein the mass ratio of dispersant to silicon powder is (1-10):100, for pre-dispersion;

[0017] S2. The dispersed mixed solution is introduced into a preparation device for grinding to obtain a silicon slurry with a nano-silicon particle size D50 < 50 nm, and the nano-silicon powder is obtained by atomization drying.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] When the present invention is grinding nano-silicon, the sealing plate can be pushed to slide along the drive shaft by the cylinder, thereby adjusting the volume inside the sand mill barrel, so that the large volume of the sand mill barrel can be maintained when the material is dispersed, thereby improving the dispersion effect; while during grinding, the volume of the sand mill barrel can be reduced, so that the concentration of the grinding medium in the sand mill barrel can be increased, so that the contact probability between the grinding medium and the material can be increased, thereby improving the grinding effect; at the same time, the present invention can sequentially drive each dispersion disk to separate from the drive shaft during the sliding process of the sealing plate, so that the adjustment range of the sealing plate is larger, and the material in the sand mill barrel can also be pushed toward the discharge component through the sealing plate, thereby improving the discharge speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of the preparation device of the present invention;

[0022] Figure 2 It is a schematic diagram of the front cross-section structure of the preparation device of the present invention;

[0023] Figure 3 Schematic diagram of the structure of the drive shaft and its connecting parts in the preparation device of the present invention;

[0024] Figure 4 for Figure 3 Schematic diagram of the front cross-section structure;

[0025] Figure 5 for Figure 4 A schematic diagram of the structure at point A in the middle;

[0026] Figure 6 Schematic diagram of the exploded structure of the telescopic member in the preparation device of the present invention;

[0027] Figure 7 It is a schematic structural diagram of the dispersion disk in the preparation device of the present invention;

[0028] Figure 8 Schematic diagram of the structure of the drive shaft in the preparation device of the present invention;

[0029] Figure 9 It is a schematic diagram of the front cross-section structure of the discharging assembly in the preparation device of the present invention;

[0030] Figure 10 It is a schematic side sectional structure diagram of the discharge assembly in the preparation device of the present invention.

[0031] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0032] 1. Base; 2. Drive box; 3. Drive shaft; 31. Snap-fit groove; 4. Dispersing disc; 5. Sanding cylinder; 51. Slide; 6. Discharge assembly; 61. Discharge cover; 62. Filter screen; 63. Discharge pipe; 7. Sealing plate; 71. Annular rotating groove; 8. Cylinder; 81. Rotating bearing; 9. Telescopic member; 91. Arc sleeve; 92. Arc slide; 921. Stop block; 93. Slot; 10. Snap-fit Parts; 101, arc-shaped mounting groove; 102, extrusion block; 103, clamping rod; 104, spring; 11, brush assembly; 111, reciprocating screw; 1111, mounting plate; 112, sealing cover; 1121, fixing strip; 113, concave rotating cover; 114, inner gear ring; 115, slider; 116, L-shaped fixing rod; 117, transition gear column; 118, driving gear; 119, brush. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] like Figure 1-10 As shown: One embodiment of the present invention is:

[0035] A nano-silicon preparation device includes a base 1, a drive box 2 is provided on one side of the top of the base 1, the output end of the drive box 2 passes through the drive box 2 and is installed with a drive shaft 3, a plurality of dispersion discs 4 are slidably provided on the outer wall of the drive shaft 3, a sanding cylinder 5 is installed on the side wall of the drive box 2, and the drive shaft 3 and the dispersion disc 4 are located in the sanding cylinder 5, and a discharge assembly 6 is provided on the end of the sanding cylinder 5 away from the drive box 2, and a sealing plate 7 is slidably connected between the inner walls of the sanding cylinder 5, and the sealing plate 7 is located on the same side of each dispersion disc 4 and close to the drive box 2 is provided, the sealing plate 7 is rotatably connected to the side of the driving box 2 with a cylinder 8, and the fixed end of the cylinder 8 is fixedly connected to the inner wall of the driving box 2, the sealing plate 7 and the adjacent dispersion discs 4, and the two adjacent dispersion discs 4 are connected by a plurality of telescopic parts 9, each dispersion disc 4 is connected to the driving shaft 3 by a clamping part 10, and the cylinder 8 pushes the sealing plate 7 to slide toward the discharge assembly 6 and unlocks each dispersion disc 4 in turn, and the dispersion disc 4 in this embodiment is penetrated by a plurality of through grooves.

[0036] In this embodiment, in order to enable the sealing plate to unlock each dispersion disk in turn during the sliding process, the clamping member 10 includes an arc-shaped mounting groove 101 provided on the surface of the dispersion disk 4, and an extrusion block 102 is slidably connected between the inner walls of the arc-shaped mounting groove 101, and a clamping rod 103 is fixed to the bottom of the extrusion block 102, and one end of the clamping rod 103 is inserted into the drive shaft 3, and a spring 104 is sleeved on the outer wall of the clamping rod 103, and the spring 104 is located below the extrusion block 102, and a clamping groove 31 that cooperates with the clamping rod 103 is provided on the outer wall of the drive shaft 3; each telescopic member 9 includes an arc-shaped sleeve 91 installed on the surface of the dispersion disk 4, and the inner wall of the arc-shaped sleeve 91 is slidably connected with an arc-shaped slider 92, and one end of each arc-shaped slider 92 is respectively fixed to the sealing plate 7 and the adjacent dispersion disk 4, and an arc-shaped sleeve 91 is adapted to the arc-shaped mounting groove 101 and The arc-shaped slider 92 on the arc-shaped sleeve 91 is connected, and a slot 93 cooperating with the clamping rod 103 is opened at one end near the arc-shaped mounting groove 101, and an inclined slope is provided. When the sealing plate starts to slide, since all the dispersion discs are clamped and fixed to the drive shaft by the clamping parts, the sliding of the sealing plate can first push the telescopic part closest to it to contract, so that one of the arc-shaped sliders in the multiple telescopic parts is inserted into the arc-shaped mounting groove, thereby pushing the extrusion block and the clamping rod upward through the arc-shaped slider, so that the clamping rod is disengaged from the clamping groove on the drive shaft, so that the dispersion disc is separated from the drive shaft and can slide relative to each other, and then the second, third, fourth...dispersing discs are pushed in turn to unlock, and finally the volume of the sand mill barrel is adjusted, and the number of dispersion discs in the adjusted sand mill barrel remains unchanged, thereby improving the grinding efficiency.

[0037] In this embodiment, in order to ensure that each dispersion disk can be in place when it returns, the arc-shaped mounting groove 101 on each dispersion disk 4 is set at different angles. When each dispersion disk returns, it can only be fixed when the clamping rod matches the clamping groove, and the dispersion disk 4 and the drive shaft 3 are slidably connected by a key-groove method.

[0038] In this embodiment, a limiting block 921 is provided on the outer wall of the arc-shaped slider 92, and a limiting ring that cooperates with the limiting block 921 is provided at the end of the arc-shaped sleeve 91. The mutual cooperation between the limiting block and the limiting ring can prevent the arc-shaped slider from separating from the arc-shaped sleeve.

[0039] In this embodiment, the cylinder 8 and the sealing plate 7 are rotatably connected via a rotating bearing 81 , and the sealing plate 7 is provided with an annular rotating groove 71 that cooperates with the rotating bearing 81 .

[0040] In this embodiment, the discharge assembly 6 includes a discharge cover 61, and a filter screen 62 is provided at the open end of the discharge cover 61. One end of the discharge cover 61 equipped with the filter screen 62 is connected to the sanding cylinder 5 and is detachably connected. The bottom of the discharge cover 61 is connected to a discharge pipe 63. The material that has been ground and meets the particle size can be discharged into the discharge cover through the filter screen, and then discharged from the discharge pipe.

[0041] In this embodiment, in order to improve the filtering efficiency of the filter and avoid clogging of the filter surface, a brush assembly 11 that cooperates with the filter 62 is installed at the end of the drive shaft 3. The brush assembly 11 includes a reciprocating screw 111 connected to the drive shaft 3, and the reciprocating screw 111 is rotatably connected to a sealing cover 112, and the sealing cover 112 is connected to the inner wall of the sanding cylinder 5. The sealing cover 112 is rotatably connected to the end away from the drive shaft 3 with a concave rotating cover 113. The inner wall of the concave rotating cover 113 is provided with an inner gear ring 114. The outer wall of the reciprocating screw 111 is threadedly connected to a slider 115, and the slider 115 is slidably connected to the inner wall of the sealing cover 112. An L-shaped fixing rod 116 is fixed to the outer wall of one side of the slider 115. The outer wall of the L-shaped fixing rod 116 is rotatably connected to a transition gear column 117. The wall is fixed with a driving gear 118 that is meshed with the transition gear column 117. The transition gear column 117 is intermittently meshed with the inner gear ring 114 as the slider 115 slides back and forth. The end of the concave rotating cover 113 is fixed with a brush 119 that abuts against the filter screen 62. When the drive shaft rotates, the reciprocating screw and the driving gear can be synchronously driven to rotate, and the reciprocating screw can drive the slider and the transition gear column to slide back and forth under the limiting action of the sealing cover, so that the transition gear column intermittently meshes with the inner gear ring. Since the transition gear column and the driving gear are always meshed, when the transition gear column is meshed with the driving gear, it can drive the concave rotating cover and the brush to rotate, so that the brush can intermittently clean the filter screen to avoid clogging of the filter screen, and the intermittently rotating brush will not affect the discharge of the material.

[0042] In this embodiment, in order to facilitate the cleaning of the material in the sanding cylinder, a mounting plate 1111 is fixed to the end of the reciprocating screw 111, and the mounting plate 1111 is connected to a dispersion disk 4 by a telescopic member 9. A fixing bar 1121 is fixed to the side wall of the sealing cover 112, and a slide groove 51 that cooperates with the fixing bar 1121 is provided on the inner wall of the sanding cylinder 5, and the end of the slide groove 51 passes through the end of the sanding cylinder 5. When the sanding cylinder needs to be cleaned, the staff removes the discharge assembly, and can push the sealing plate and the dispersion disk to slide through the cylinder, and then push the mounting plate and the reciprocating screw, the sealing cover, etc. to slide, so that all the materials can be pushed out of the sanding cylinder, and the sealing plate can push out the remaining materials in the sanding cylinder to achieve cleaning.

[0043] The specific working process of this preparation device is as follows:

[0044] When nano-silicon needs to be ground, the mixed nano-silicon raw materials are added into the sand mill 5 through the feed pipe (the feed pipe is arranged at the end of the sand mill away from the discharge assembly 6, and the feed port of the feed pipe is located between the sealing plate 7 and the discharge assembly 6), and then the motor in the drive box 2 is started to drive the drive shaft 3 and the dispersion disk 4 to rotate, so as to disperse and mix the materials;

[0045] After dispersion is completed, the cylinder 8 is started according to the amount of added material, and the cylinder 8 pushes the sealing plate 7 to slide, thereby pushing the telescopic member 9 connected to the sealing plate 7 to shrink. During the shrinkage process of the telescopic member 9, a group of arc-shaped sliders 92 of the telescopic member 9 (the length of this group of arc-shaped sliders 92 is greater than the length of the other arc-shaped sliders 92) are inserted into the arc-shaped mounting groove 101 of the dispersion disc 4, and the extrusion block 102 and the clamping rod 103 are gradually lifted up by the inclined surface at the top of the arc-shaped slider 92, so that the clamping rod 103 is separated from the clamping groove 31 on the drive shaft 3, thereby separating the group of dispersion discs 4 from the drive shaft 3, so that the group of dispersion discs 4 can slide synchronously with the sealing plate 7. In this way, the sliding of different numbers of dispersion discs 4 is adjusted according to the amount of material, thereby adjusting the volume of the sanding cylinder 5 to an appropriate size;

[0046] During the grinding process, the ground material passes through the filtration of the filter screen 62 and enters the discharge cover 61 and is discharged through the discharge pipe 63 for collection. During the grinding process, the drive shaft 3 synchronously drives the reciprocating screw 111 and the driving gear 118 to rotate, and the reciprocating screw 111 drives the slider 115, the L-shaped fixing rod 116 and the transition gear column 117 to slide back and forth. During the back and forth sliding process, the transition gear column 117 intermittently engages with the inner gear ring 114. Since the transition gear column 117 always maintains engagement with the driving gear 118, when the transition gear column 117 engages with the inner gear ring 114, it can drive the inner gear ring 114, the concave rotating cover 113 and the brush 119 to rotate, thereby intermittently cleaning the filter screen 62 through the brush 119.

[0047] In order to improve the discharging efficiency after grinding for a period of time, the cylinder 8 can be started intermittently to push the sealing plate 7 to continue sliding, continue to compress the volume of the sanding barrel 5, and push the material toward the filter 62 through the sealing plate 7, so as to increase the discharging speed. At the same time, after discharging for a period of time, the volume of the sanding barrel 5 can be further reduced, so that the grinding effect can be always guaranteed.

[0048] After the grinding is completed, when the filter screen 62 and the sanding cylinder 5 need to be cleaned, the discharge assembly 6 is first removed, and then the cylinder 8 is used to push the dispersion disk 4 and the brush assembly 11 to gradually separate from the drive shaft 3 and push out the sanding cylinder 5, so as to facilitate the cleaning of the inside of the sanding cylinder 5, and at the same time, all the residues in the sanding cylinder 5 can be scraped out. When the device is working, the brush 119 of the brush assembly 11 abuts against the filter screen 62, thereby ensuring that the position of the brush assembly 11 is fixed.

[0049] In this embodiment, a cooling jacket is provided on the outer wall of the sand mill cylinder 5 and is connected with a cooling inlet pipe and a cooling outlet pipe.

[0050] A method for preparing nano-silicon comprises the following steps:

[0051] S1. Add high-purity silicon powder to the dispersion tank of a primary sand mill, add appropriate solvent to adjust the solid content to 20-40 wt.%, and then add dispersant, wherein the mass ratio of dispersant to silicon powder is (1-10):100, for pre-dispersion;

[0052] S2. The dispersed mixed solution is introduced into the preparation device of Example 1 for grinding to obtain silicon slurry with nano-silicon particle size D50 < 50 nm, and then atomized and dried to obtain nano-silicon powder.

[0053] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preparing nano-silicon, characterized in that: The invention comprises a base (1), a driving box (2) is provided on one side of the top of the base (1), an output end of the driving box (2) passes through the driving box (2) and is provided with a driving shaft (3), a plurality of dispersion discs (4) are slidably provided on the outer wall of the driving shaft (3), a sanding cylinder (5) is provided on the side wall of the driving box (2), and the driving shaft (3) and the dispersion disc (4) are located in the sanding cylinder (5), a discharge assembly (6) is provided on one end of the sanding cylinder (5) away from the driving box (2), a sealing plate (7) is slidably connected between the inner walls of the sanding cylinder (5), and the sealing plate (7) is located on each dispersion disc ( 4) and is arranged close to the drive box (2), the sealing plate (7) is rotatably connected to a cylinder (8) on one side close to the drive box (2), and the fixed end of the cylinder (8) is fixedly connected to the inner wall of the drive box (2), the sealing plate (7) and adjacent dispersion discs (4) and two adjacent dispersion discs (4) are connected through a plurality of telescopic parts (9), each dispersion disc (4) is connected to the drive shaft (3) through a clamping part (10), and the cylinder (8) pushes the sealing plate (7) to slide in the direction of the discharge assembly (6) and unlocks each dispersion disc (4) in turn; The clamping member (10) includes an arc-shaped mounting groove (101) provided on the surface of the dispersion disk (4); an extrusion block (102) is slidably connected between the inner walls of the arc-shaped mounting groove (101); a clamping rod (103) is fixedly connected to the bottom of the extrusion block (102); one end of the clamping rod (103) is inserted into the drive shaft (3); a spring (104) is sleeved on the outer wall of the clamping rod (103); and the spring (104) is located below the extrusion block (102); and a clamping groove (31) is provided on the outer wall of the drive shaft (3) to cooperate with the clamping rod (103); Each of the telescopic members (9) comprises an arc-shaped sleeve (91) mounted on the surface of the dispersion disk (4), an inner wall of the arc-shaped sleeve (91) is slidably connected to an arc-shaped slider (92), and one end of each arc-shaped slider (92) is respectively fixed to the sealing plate (7) and the adjacent dispersion disk (4), one of the arc-shaped sleeves (91) is adapted to and communicates with the arc-shaped mounting groove (101), and an end of the arc-shaped slider (92) on the arc-shaped sleeve (91) close to the arc-shaped mounting groove (101) is provided with a slot (93) that cooperates with the clamping rod (103), and is provided with an inclined slope; The arc-shaped mounting grooves (101) on each of the dispersion discs (4) are respectively arranged at different angles.

2. The nano-silicon preparation device according to claim 1, characterized in that: A limiting block (921) is provided on the outer wall of the arc-shaped sliding block (92), and a limiting ring cooperating with the limiting block (921) is provided at the end of the arc-shaped sleeve (91).

3. The nano-silicon preparation device according to claim 1, characterized in that: The cylinder (8) and the sealing plate (7) are rotatably connected via a rotating bearing (81), and the sealing plate (7) is provided with an annular rotating groove (71) that cooperates with the rotating bearing (81).

4. The nano-silicon preparation device according to claim 1, characterized in that: The discharge assembly (6) comprises a discharge cover (61), an open end of which is provided with a filter screen (62), one end of the discharge cover (61) on which the filter screen (62) is installed being connected to the sanding cylinder (5) and being detachably connected, and a discharge pipe (63) being connected to the bottom of the discharge cover (61).

5. The nano-silicon preparation device according to claim 4, characterized in that: The end of the drive shaft (3) is provided with a brush assembly (11) that cooperates with the filter screen (62). The brush assembly (11) includes a reciprocating screw (111) connected to the drive shaft (3). The reciprocating screw (111) is rotatably connected to a sealing cover (112), and the sealing cover (112) is connected to the inner wall of the sanding cylinder (5). The end of the sealing cover (112) away from the drive shaft (3) is rotatably connected to a concave rotating cover (113). The inner wall of the concave rotating cover (113) is provided with an inner gear ring (114). The outer wall of the reciprocating screw (111) is threadedly connected to a slider (115). , and the slider (115) is slidably connected to the inner wall of the sealing cover (112), an L-shaped fixing rod (116) is fixed to the outer wall of one side of the slider (115), and the outer wall of the L-shaped fixing rod (116) is rotatably connected to the transition gear column (117), the outer wall of the end of the reciprocating screw (111) is fixed to a driving gear (118) meshing with the transition gear column (117), and the transition gear column (117) is intermittently meshed with the inner gear ring (114) as the slider (115) slides back and forth, and the end of the concave rotating cover (113) is fixed to a brush (119) that abuts against the filter screen (62).

6. The nano-silicon preparation device according to claim 5, characterized in that: The end of the reciprocating screw (111) is fixedly connected to a mounting plate (1111), and the mounting plate (1111) is connected to a dispersion plate (4) via a telescopic member (9). The side wall of the sealing cover (112) is fixedly connected to a fixing strip (1121). The inner wall of the sanding cylinder (5) is provided with a sliding groove (51) that cooperates with the fixing strip (1121), and the end of the sliding groove (51) passes through the end of the sanding cylinder (5).

7. A method for preparing nano-silicon, using the preparation device according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Add high-purity silicon powder to the dispersion tank of a primary sand mill, add appropriate solvent to adjust the solid content to 20-40 wt.%, and then add dispersant, wherein the mass ratio of dispersant to silicon powder is (1-10):100, for pre-dispersion; S2. The dispersed mixed solution is introduced into the preparation device according to any one of claims 1 to 6 for grinding to obtain a silicon slurry with a nano-silicon particle size D50 < 50 nm, and the nano-silicon powder is obtained by atomization drying.

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