Preparation device and preparation method of nano silicon

Abstract

The invention relates to the technical field of nanometer silicon preparation, in particular to a nanometer silicon preparation device which comprises a driving box, a driving shaft is installed at the output end of the driving box, a plurality of dispersing discs are arranged on the outer wall of the driving shaft in a sliding mode, a sanding barrel is installed on the side wall of the driving box, and a discharging assembly is arranged at the end, away from the driving box, of the sanding barrel. A sealing plate is slidably connected between the inner walls of the sanding barrel, an air cylinder is rotatably connected to the side face, close to the driving box, of the sealing plate, and the dispersing disc and the driving shaft are connected through a clamping piece. When nanometer silicon is ground, the sealing plate can be pushed by the air cylinder to slide along the driving shaft, so that the volume of the interior of the sanding barrel is adjusted; the large volume of the sanding cylinder can be kept when materials are dispersed, the dispersing effect is improved, the volume of the sanding cylinder can be reduced when the materials are ground, the concentration of grinding media in the sanding cylinder can be increased, the contact probability of the grinding media and the materials can be increased, and therefore the grinding effect is improved.

Description

Technical Field

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

[0002] Nano silicon needs to be ground by a sand mill during the preparation process, that is, raw materials and grinding media, such as zirconium oxide beads, glass beads, zirconium silicate beads, etc., are added into the sand mill, and then the driving shaft drives the dispersion disk and the grinding media to rotate to grind the raw materials. However, the grinding chamber inside the existing sand mill is fixed and cannot be adjusted, resulting in that no matter how much raw material is, only the same volume of sand mill can be used for grinding, resulting in low grinding efficiency when the raw material is less. To this end, the present invention has developed a nano silicon preparation device to solve the above problem. Summary of the invention

[0003] The object of the present invention is to provide a nano-silicon preparation device and preparation method, which can adjust the volume of the 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 object, the first technical solution provided by the present invention is: A nano-silicon preparation device comprises a base, wherein a driving box is arranged on one side of the top of the base, an 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 arranged 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, a discharging assembly is arranged 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, a cylinder is rotatably connected to a side of the sealing plate 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 a plurality of 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 in the direction of the discharging assembly and unlocks each dispersion disk in turn.

[0005] Preferably, the clamping part includes an arc-shaped mounting groove formed 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 fixedly connected 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 cooperating with the clamping rod is formed on the outer wall of the drive shaft.

[0006] 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 with an 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 communicated with 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 an inclined slope is provided.

[0007] Preferably, the arc-shaped mounting grooves on each of the dispersion discs are respectively arranged at different angles.

[0008] Preferably, a limiting block is disposed on the outer wall of the arc-shaped sliding block, and a limiting ring cooperating with the limiting block is disposed on the end of the arc-shaped sleeve.

[0009] 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.

[0010] Preferably, the discharge assembly comprises a discharge cover, an open end of which 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 a discharge pipe is connected to the bottom of the discharge cover.

[0011] Preferably, a brush assembly that cooperates with the filter screen is installed at the end of the driving shaft, 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 L-shaped fixing rod is fixedly connected to the outer wall of one side of the slider, and 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 fixedly connected to a driving gear meshing with the transition gear column, the transition gear column is intermittently meshing with the inner gear ring as the slider reciprocates, and the end of the concave rotating cover is fixedly connected to a brush that abuts against the filter screen.

[0012] Preferably, a mounting plate is fixedly connected to the end of the reciprocating screw rod, the mounting plate is connected to a dispersion disk via a telescopic member, a fixing strip is fixedly connected to the side wall of the sealing cover, a sliding groove which cooperates with the fixing strip is provided on the inner wall of the sanding cylinder, and the end of the sliding groove passes through the end of the sanding cylinder.

[0013] The second technical solution provided by the present invention is: A method for preparing nano-silicon comprises the following steps: S1. Add high-purity silicon powder into the dispersion tank of the primary sand mill, add appropriate solvent to adjust the solid content to 20-40wt.%, 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 a preparation device for grinding to obtain a silicon slurry with a nano-silicon particle size D50 < 50 nm, and then atomized and dried to obtain nano-silicon powder.

[0014] Compared with the prior art, the present invention has the following beneficial effects: When the present invention is grinding nano silicon, the sealing plate can be pushed to slide along the driving shaft by the cylinder, thereby adjusting the volume inside the sand mill, so that the large volume of the sand mill can be maintained when the material is dispersed, thereby improving the dispersion effect. During grinding, the volume of the sand mill can be reduced, so that the concentration of the grinding medium in the sand mill 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, during the sliding process of the sealing plate, the present invention can sequentially drive each dispersion disk to separate from the driving shaft, so that the adjustment range of the sealing plate is larger, and the sealing plate can also be used to push the material in the sand mill toward the discharge component to increase the discharge speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of the preparation device of the present invention; Figure 2 It is a schematic diagram of the front cross-section structure of the preparation device of the present invention; Figure 3 It is a schematic structural diagram of a driving shaft and its connecting parts in the preparation device of the present invention; Figure 4 for Figure 3 Schematic diagram of the cross-section structure; Figure 5 for Figure 4 A schematic diagram of the structure enlargement at the center A; Figure 6 It is a schematic diagram of the exploded structure of the telescopic member in the preparation device of the present invention; Figure 7 It is a schematic diagram of the structure of the dispersion disk in the preparation device of the present invention; Figure 8 It is a schematic structural diagram of a driving shaft in the preparation device of the present invention; Fig. 9It is a schematic diagram of the front cross-section structure of the discharging component in the preparation device of the present invention; Fig.10 It is a schematic diagram of the side section structure of the discharging assembly in the preparation device of the present invention.

[0017] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Base; 2. Drive box; 3. Drive shaft; 31. Snap-on groove; 4. Dispersing disc; 5. Sanding cylinder; 51. Slide; 6. Discharging assembly; 61. Discharging cover; 62. Filter screen; 63. Discharging pipe; 7. Sealing plate; 71. Annular rotating groove; 8. Cylinder; 81. Rotating bearing; 9. Telescopic member; 91. Arc sleeve; 92. Arc slide block; 921. Limit block; 93. Slot; 10. Snap-on Parts; 101, arc-shaped installation groove; 102, extrusion block; 103, clamping rod; 104, spring; 11, brush assembly; 111, reciprocating screw rod; 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

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0019] like Figure 1-10 As shown: One embodiment of the present invention is: A nano-silicon preparation device comprises a base 1, a driving box 2 is arranged 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 installed with a driving shaft 3, a plurality of dispersion discs 4 are slidably arranged on the outer wall of the driving shaft 3, a sand mill 5 is installed on the side wall of the driving box 2, and the driving shaft 3 and the dispersion disc 4 are located in the sand mill 5, a discharge assembly 6 is arranged at one end of the sand mill 5 away from the driving box 2, a sealing plate 7 is slidably connected between the inner walls of the sand mill 5, and the sealing plate 7 is located on the same side of each dispersion disc 4 and close to the driving box 2, a side of the sealing plate 7 close to the driving box 2 is rotatably connected with a cylinder 8, and a 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 disks 4, and the two adjacent dispersion disks 4 are connected by a plurality of telescopic members 9, each dispersion disk 4 is connected to the driving shaft 3 by a clamping member 10, and the cylinder 8 pushes the sealing plate 7 to slide toward the discharging assembly 6 and unlocks each dispersion disk 4 in turn, and the dispersion disk 4 in this embodiment is provided with a plurality of through grooves.

[0020] 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 fixedly connected 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 an arc-shaped sliding block 92 is slidably connected to the inner wall of the arc-shaped sleeve 91, and one end of each arc-shaped sliding block 92 is respectively fixedly connected to the sealing plate 7 and the adjacent dispersion disk 4, and an arc-shaped sleeve 91 is adapted to and The arc-shaped sliding block 92 on the arc-shaped sleeve 91 is connected, and one end of the arc-shaped sliding block 92 near the arc-shaped mounting groove 101 is provided with a groove 93 that cooperates with the clamping rod 103, and is provided with an inclined slope, wherein, when the sealing plate just 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 an arc-shaped sliding block among the multiple telescopic parts is inserted into the arc-shaped mounting groove, so that the extrusion block and the clamping rod are lifted upward by the arc-shaped sliding block, 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 is adjusted, and the number of dispersion discs in the adjusted sand mill remains unchanged, thereby improving the grinding efficiency.

[0021] In this embodiment, in order to make each dispersion disk able to be in place when returning, the arc-shaped mounting groove 101 on each dispersion disk 4 is respectively 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 slidingly connected by a key-groove method.

[0022] In this embodiment, a limit block 921 is provided on the outer wall of the arc-shaped slider 92, and a limit ring cooperating with the limit block 921 is provided at the end of the arc-shaped sleeve 91. The cooperation between the limit block and the limit ring can prevent the arc-shaped slider from separating from the arc-shaped sleeve.

[0023] 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 .

[0024] 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.

[0025] 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 driving shaft 3. The brush assembly 11 includes a reciprocating screw 111 connected to the driving 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 end of the sealing cover 112 away from the driving shaft 3 is rotatably connected to a concave rotating cover 113, and 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 a transition gear column 117. A driving gear 118 meshing with a transition gear column 117 is fixedly connected to the wall. The transition gear column 117 is intermittently meshed with the inner gear ring 114 as the slider 115 slides back and forth. A brush 119 abutting against the filter screen 62 is fixedly connected to the end of the concave rotating cover 113. 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 and the driving gear are meshed, the concave rotating cover and the brush can be driven 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.

[0026] In this embodiment, in order to facilitate the cleaning of the material in the sand mill cylinder, a mounting plate 1111 is fixedly connected 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 strip 1121 is fixedly connected to the side wall of the sealing cover 112. A slide groove 51 cooperating with the fixing strip 1121 is provided on the inner wall of the sand mill cylinder 5, and the end of the slide groove 51 passes through the end of the sand mill cylinder 5. When the sand mill cylinder needs to be cleaned, the staff can remove the discharge assembly and push the sealing plate and the dispersion disk to slide through the cylinder, and then push the mounting plate, the reciprocating screw, the sealing cover, etc. to slide, so that all the materials can be pushed out of the sand mill cylinder, and the sealing plate can push out the remaining materials in the sand mill cylinder to achieve cleaning.

[0027] The specific working process of this preparation device is as follows: When nano silicon needs to be ground, the mixed nano silicon raw material is added into the sand mill 5 through a feed pipe (the feed pipe is arranged at one 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; 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 remaining arc-shaped sliders 92) are inserted into the arc-shaped installation groove 101 of the dispersion disk 4, and the extrusion block 102 and the clamping rod 103 are gradually lifted up through 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 disks 4 from the drive shaft 3, so that the group of dispersion disks 4 can slide synchronously with the sealing plate 7, so that different numbers of dispersion disks 4 are adjusted to slide according to the amount of material, thereby adjusting the volume of the sand mill 5 to a suitable size; 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.

[0028] 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 sand mill 5, and push the material toward the filter screen 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 sand mill 5 can be further reduced, so that the grinding effect can be always guaranteed.

[0029] After the grinding is completed, when it is necessary to clean the filter screen 62 and the sand mill 5, first remove the discharge assembly 6, and then use the cylinder 8 to push the dispersion disk 4 and the brush assembly 11 to gradually separate from the drive shaft 3 and push out the sand mill 5, so as to facilitate the cleaning of the inside of the sand mill 5, and at the same time, all the residues in the sand mill 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 the fixed position of the brush assembly 11.

[0030] 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.

[0031] A method for preparing nano-silicon comprises the following steps: S1. Add high-purity silicon powder into the dispersion tank of the primary sand mill, add appropriate solvent to adjust the solid content to 20-40wt.%, 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 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.

[0032] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; 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.

[0033] 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 nano-silicon preparation device, characterized in that: The invention comprises a base (1), wherein a driving box (2) is arranged 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 installed on the side wall of the driving box (2), and the driving shaft (3) and the dispersion discs (4) are located in the sanding cylinder (5), a discharge assembly (6) is arranged at 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 ( The sealing plate (7) is arranged on the same side of the drive box (4) and close to the drive box (2); the sealing plate (7) is rotatably connected to a cylinder (8) on a 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 via a plurality of telescopic parts (9); each dispersion disc (4) is connected to the drive shaft (3) via 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.

2. The nano-silicon preparation device according to claim 1, characterized in that: The clamping member (10) comprises an arc-shaped installation groove (101) formed on the surface of the dispersion disk (4); an extrusion block (102) is slidably connected between the inner walls of the arc-shaped installation 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) cooperating with the clamping rod (103) is formed on the outer wall of the drive shaft (3).

3. The nano-silicon preparation device according to claim 2, characterized in that: Each of the telescopic members (9) comprises an arc-shaped sleeve (91) mounted on the surface of the dispersion disk (4); an arc-shaped slider (92) is slidably connected to the inner wall of the arc-shaped sleeve (91); 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.

4. The nano-silicon preparation device according to claim 3, characterized in that: The arc-shaped installation groove (101) on each dispersion disc (4) is respectively arranged at different angles.

5. The nano-silicon preparation device according to claim 3, characterized in that: A limiting block (921) is disposed on the outer wall of the arc-shaped sliding block (92), and a limiting ring cooperating with the limiting block (921) is disposed at the end of the arc-shaped sleeve (91).

6. 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).

7. 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 is connected to the sand mill cylinder (5) and is detachably connected, and a discharge pipe (63) is connected to the bottom of the discharge cover (61).

8. The nano-silicon preparation device according to claim 7, characterized in that: A brush assembly (11) that cooperates with the filter screen (62) is mounted at the end of the drive shaft (3). The brush assembly (11) comprises 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). An 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). The slider (115) is slidably connected to the inner wall of the sealing cover (112); an L-shaped fixing rod (116) is fixedly connected to the outer wall of one side of the slider (115); a transition gear column (117) is rotatably connected to the outer wall of the L-shaped fixing rod (116); a driving gear (118) meshingly connected to the transition gear column (117) is fixedly connected to the outer wall of the end of the reciprocating screw rod (111); the transition gear column (117) is intermittently meshedly connected to the inner gear ring (114) as the slider (115) reciprocates; and a brush (119) abutting against the filter screen (62) is fixedly connected to the end of the concave rotating cover (113).

9. The nano-silicon preparation device according to claim 8, characterized in that: A mounting plate (1111) is fixedly connected to the end of the reciprocating screw rod (111); the mounting plate (1111) is connected to a dispersion plate (4) via a telescopic member (9); a fixing strip (1121) is fixedly connected to the side wall of the sealing cover (112); a slide groove (51) cooperating with the fixing strip (1121) is formed 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).

10. A method for preparing nano-silicon, using the preparation device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Add high-purity silicon powder into the dispersion tank of the primary sand mill, add appropriate solvent to adjust the solid content to 20-40wt.%, 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 9 for grinding to obtain silicon slurry with nano-silicon particle size D50 < 50 nm, and then atomized and dried to obtain nano-silicon powder.

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