CN115571883B - Purifying device for preparing crystalline silicon of photovoltaic material - Google Patents
Purifying device for preparing crystalline silicon of photovoltaic material Download PDFInfo
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- CN115571883B CN115571883B CN202211304529.3A CN202211304529A CN115571883B CN 115571883 B CN115571883 B CN 115571883B CN 202211304529 A CN202211304529 A CN 202211304529A CN 115571883 B CN115571883 B CN 115571883B
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- 239000000463 material Substances 0.000 title claims abstract description 102
- 229910021419 crystalline silicon Inorganic materials 0.000 title claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 174
- 239000002245 particle Substances 0.000 claims abstract description 95
- 238000012216 screening Methods 0.000 claims abstract description 35
- 238000005554 pickling Methods 0.000 claims abstract description 33
- 239000002253 acid Substances 0.000 claims abstract description 26
- 238000005406 washing Methods 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 11
- 238000000746 purification Methods 0.000 claims description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 5
- 238000002360 preparation method Methods 0.000 claims 2
- 230000004308 accommodation Effects 0.000 claims 1
- 239000011148 porous material Substances 0.000 claims 1
- 239000008187 granular material Substances 0.000 description 27
- 238000000034 method Methods 0.000 description 13
- 239000002210 silicon-based material Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 8
- 241000883990 Flabellum Species 0.000 description 5
- 239000012535 impurity Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/02—Silicon
- C01B33/037—Purification
Abstract
The invention discloses a purifying device for preparing crystalline silicon of a photovoltaic material, which comprises a frame, an acid washing cylinder, a stirring column, a screening ring, a stirring column, a mounting plate and a lifting piece, wherein: the acid washing cylinder is arranged on the frame, the acid washing cylinder is provided with a stirring cavity, the screening ring is arranged on the inner wall of the stirring cavity, the screening ring divides the stirring cavity into a large particle containing cavity and a small particle containing cavity, the large particle containing cavity is positioned below the lower particle containing cavity, the screening ring is provided with a material distributing hole, and small particle materials in the large particle containing cavity enter the small particle containing cavity through the material distributing ring; the lifting piece is installed in the frame, the mounting panel is installed the lower extreme of lifting piece, the stirring post is vertical to be rotated and is installed on the mounting panel, the stirring post is used for right the mixture stirring in the stirring chamber, the lifting piece is used for driving the stirring post is relative the stirring chamber reciprocates. The device is convenient for improving the material pickling efficiency.
Description
Technical Field
The invention relates to the technical field of photovoltaic material processing equipment, in particular to a purifying device for preparing crystalline silicon of a photovoltaic material.
Background
The metallurgical method is an optional back end which can effectively reduce the content of metal impurities in the industrial silicon in advance before the prior metallurgical method for purifying the polycrystalline silicon needs to be subjected to vacuum melting and directional solidification purification, and can be combined with the metallurgical methods such as vacuum melting, directional solidification and the like to produce the solar polycrystalline silicon material with the purity of 99.9999 percent, wherein the purity of the industrial silicon produced by adopting the arc heating quartz sand changing method is lower than 99.9 percent.
Before the pickling process, coarse silicon is crushed into a material with certain granularity, then the material of the granules is placed in an acid solution for stirring and pickling, the granularity of the silicon material is related to the pickling effect and the recovery rate of the silicon material, and metal impurities are enriched in grain boundaries or gaps of silicon blocks, and only when the grain size of the silicon material is smaller than or equal to the grain boundaries, the metal impurities can be effectively taken out, but the smaller the size is, the less easy the silicon material is recovered.
In the crushing process, the materials are crushed by a jaw crusher, and then the crushed materials are subjected to air flow crushing to ensure that the particle size of the silicon materials reaches 38-160 mu m, but the acid washing time of the silicon materials with different particle sizes is different, but the existing acid washing is carried out by simultaneously placing the silicon materials with different particle sizes in an acid solution for stirring for about 5 hours, then taking out all the materials at the same time, wherein the silicon materials with smaller particle sizes are subjected to acid washing in the process, the silicon materials with smaller particle sizes are contacted with the larger silicon materials after the acid washing are finished, the acid washing effect of the silicon materials with larger particle sizes is affected to a certain extent, further long-time stirring is needed, and the acid washing efficiency is lower.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides a purifying device for preparing crystalline silicon of a photovoltaic material.
The invention provides a purifying device for preparing photovoltaic material crystalline silicon, which comprises a frame, an acid washing cylinder, a stirring column, a screening ring, a stirring column, a mounting plate and a lifting piece, wherein:
the acid washing cylinder is arranged on the frame, the acid washing cylinder is provided with a stirring cavity, the screening ring is arranged on the inner wall of the stirring cavity, the screening ring divides the stirring cavity into a large particle containing cavity and a small particle containing cavity, the large particle containing cavity is positioned below the small particle containing cavity, the screening ring is provided with a material separating hole, and small particle materials in the large particle containing cavity enter the small particle containing cavity through the screening ring;
the lifting piece is arranged on the frame, the mounting plate is arranged at the lower end of the lifting piece, the stirring column is vertically and rotatably arranged on the mounting plate, the stirring column is used for stirring the mixture in the stirring cavity, the lifting piece is used for driving the stirring column to move up and down relative to the stirring cavity, and when the stirring column moves in the large particle accommodating cavity, the distance between the outer side wall of the stirring column and the inner wall of the screening ring is smaller than the particle size of the minimum particle material, preferably, a certain distance is reserved between the outer wall of the stirring column and the outer diameter of the screening ring;
specifically, the lifting piece can be a mechanism which can drive the plate-shaped material to move up and down, such as an electric cylinder, an oil cylinder, a screw rod sliding block mechanism and the like in the prior art.
Firstly, shift out the stirring post through the lifting piece the pickling section of thick bamboo to make the stirring post be located the pickling section of thick bamboo top, will have big granule and the material of granule to put in big granule holds the chamber, then drive through the lifting piece the stirring post moves down and makes the latter half of stirring post remove to dividing sieve ring department, avoid the material to arrange to the granule from dividing sieve ring's centre bore department and hold the chamber, then put into acid solution in the stirring chamber, the stirring post makes acid solution carry out the pickling to the material, when stirring 3-4 hours, the material surface impurity that the granule is less has been washd and is accomplished, drive the stirring post through the lifting piece and move down and carry out stirring to the liquid in the big granule holds the chamber again to a decurrent force of liquid, make liquid downward movement and big granule hold the bottom surface contact back liquid to the material of chamber and upward force, and then make the granule material enter into the granule and hold the chamber through dividing the material hole, after the lifting piece drives the stirring post and reciprocate a plurality of times, there is more granule material to be located the granule and hold the chamber, then to take out granule hold the chamber, then carry out the granule to hold the material and carry out the pickling to big granule and the whole granule and hold the granule in the chamber.
Preferably, the screening ring is rotatably arranged on the pickling cylinder, and the rotation axis of the screening ring is coaxial with the rotation axis of the stirring column, so that the efficiency of entering small materials into the small particle accommodating cavity in the large particle accommodating cavity is further increased.
Preferably, the range of the aperture of the distributing hole is as follows: 45um-80um, because the particle diameter of the acid washing material is 38-160um, the smaller material is distinguished from the larger material, and the smaller material is prevented from being stuck to the outer wall of the larger material, so that the acid washing effect and efficiency are affected.
In order to further increase efficiency, the stirring device preferably further comprises a driving piece, wherein the driving piece is arranged on the mounting plate and used for driving the stirring column to rotate, and the driving piece can be a motor and other components capable of driving the shaft components to rotate in the prior art.
In order to further improve the pickling efficiency, it is preferable that the pickling device further comprises a heating member which is mounted on the frame and is used for heating the stirring column.
In order to further improve the pickling efficiency, preferably, the inner diameter of the large particle containing cavity is gradually reduced from top to bottom, so that small particle materials can enter the small particle containing cavity through the material separating hole.
Preferably, the pickling device further comprises a vertical stirring rod, wherein the vertical stirring rod is vertically and slidably arranged at the bottom of the stirring column, the vertical stirring rod is provided with a part extending out of the stirring column, the bottom of the vertical stirring rod is in contact with the bottom of the stirring cavity, the stirring column is moved downwards, and the vertical stirring rod vertically slides relative to the stirring column, so that pickling efficiency is further improved.
Preferably, the outer side wall of the vertical stirring rod is provided with stirring blades, so that the pickling efficiency is further improved.
Preferably, the pickling device further comprises a stirring fan, wherein the stirring fan is arranged on the outer side wall of the stirring column, and when the stirring column moves downwards to the bottommost end, the stirring fan is in contact with the upper surface of the screening ring, so that the pickling efficiency is further improved.
Preferably, the stirring fan blade is provided with a material accommodating cavity, the upper surface and the lower surface of the stirring fan blade are respectively provided with a blanking hole and a liquid leakage hole, the blanking holes and the liquid leakage holes are communicated with the accommodating cavity, the blanking holes are used for leaking materials in the small particle accommodating cavity to the accommodating cavity, and the liquid leakage holes are used for discharging liquid in the accommodating cavity; preferably, the thickness of stirring flabellum from stirring flabellum's first side to stirring flabellum's second side gets thicker gradually, first side with the second side is followed stirring flabellum's radial, and then be convenient for collect the granule material, stirring flabellum can be installed on the spliced pole through joint or other modes, and then be convenient for take out of granule material.
According to the purification device for preparing the photovoltaic material crystalline silicon, the structure is simple, the small particle materials are subjected to acid washing after a period of acid washing, the small particle materials are separated from the large particle materials, and part of the small particle materials are taken out, so that the acid washing efficiency of the large particle materials is increased.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a partial cross-sectional view of the pickling cartridge of the present invention;
FIG. 3 is an enlarged view of a portion of the area A of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar symbols indicate like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
It is to be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," and the like are directional or positional relationships as indicated based on the drawings, merely to facilitate describing the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
The purifying device for preparing the crystalline silicon of the photovoltaic material comprises a frame 1, a driving piece 2, a heating piece 3, an acid washing cylinder 4, a stirring column 5, a screening ring 6, a mounting plate 7 and a lifting piece 8, wherein:
the heating piece 3 is a heating plate, the heating plate is fixed on the frame 1, the pickling cylinder 4 is arranged on the heating plate, and the heating plate is used for heating the pickling cylinder 4;
the acid washing cylinder 4 is provided with a stirring cavity 40, a screening ring 6 is arranged on the inner wall of the stirring cavity 40, the screening ring 6 divides the stirring cavity 40 into a large particle accommodating cavity 400 and a small particle accommodating cavity 401, the large particle accommodating cavity 400 is positioned below the small particle accommodating cavity 401, a material separating hole 60 is formed in the screening ring 6, small particle materials in the large particle accommodating cavity 400 enter the small particle accommodating cavity 401 through the screening ring, the aperture of a powder hole is 70um, and the materials with the particle size smaller than 70um enter the small particle accommodating cavity 401 through the powder hole;
the lifting piece 8 is a screw rod sliding block mechanism and mainly comprises a screw rod, a sliding block and a driving motor, wherein the screw rod is vertically and rotatably arranged on the frame 1, the sliding block is arranged on the screw rod in a threaded manner, the sliding block vertically moves on the screw rod by rotating the screw rod, and the driving motor is arranged on the frame 1 and is used for driving the screw rod to rotate;
the lifting pieces 8 are two, the two lifting pieces 8 are positioned on two opposite sides of the pickling cylinder 4, in particular, a supporting frame 9 is fixed above the mounting plate 7, and two sides of the supporting frame 9 are fixedly connected with the sliding blocks; the stirring column 5 is vertically rotatably arranged on the mounting plate 7, the driving piece 2 is a gear motor, the driving piece 2 is arranged on the mounting plate 7 and is used for driving the stirring column 5 to vertically rotate, and the axis of the stirring column 5 is coaxial with the pickling cylinder 4;
the stirring column 5 is used for stirring the mixture in the stirring cavity 40, the lifting piece 8 is used for driving the stirring column 5 to move up and down relative to the stirring cavity 40, and when the stirring column 5 moves in the large particle accommodating cavity 400, the distance between the outer side wall of the stirring column 5 and the inner wall of the screening ring 6 is smaller than the particle size of the minimum particle material, preferably, the outer side wall of the stirring column 5 is in rotary contact with the inner diameter of the screening ring 6;
firstly, a stirring column 5 is moved out of a pickling cylinder 4 through a lifting piece 8, the stirring column 5 is positioned above the pickling cylinder 4, materials with large particles and small particles are placed in a large particle accommodating cavity 400, then the lifting piece 8 drives the stirring column 5 to move downwards so that the lower half part of the stirring column 5 moves to a screening ring 6, the materials are prevented from being discharged from a middle hole of the screening ring 6 to a small particle accommodating cavity 401, then an acidic solution is placed in the stirring cavity 40, the stirring column 5 is stirred by a driving piece 2 to carry out primary pickling on the materials, and when the materials are stirred for 3.5 hours, impurities on the surfaces of the materials with small particles are washed;
and then screening the small-particle materials and the large-particle materials:
the stirring column 5 is driven to reciprocate up and down by the lifting part 8, in the process, the driving part 2 drives the stirring column 5 to rotate, the stirring column 5 does not separate from the screening ring 6 when the stirring column 5 moves up to the maximum displacement, the lifting part 8 drives the stirring column 5 to move down to stir the liquid in the large particle containing cavity 400 and simultaneously exert a downward force on the liquid, so that the liquid moves down to contact with the bottom surface of the large particle containing cavity 400 and then the liquid exerts an upward force on the material, and then the small particle material enters the small particle containing cavity 401 through the material separating hole 60, and the lifting part 8 drives the stirring column 5 to reciprocate up and down for a plurality of times; in addition, in the process of downwards moving the stirring column 5, the stirring column 5 extrudes the material positioned at the bottom of the stirring column 5, so that the extrusion of large-particle materials is facilitated, the large-particle materials are reduced, in addition, small-particle materials adhered to the large-particle materials can be separated, and the pickling efficiency is further improved; when the stirring column 5 moves upwards, the larger materials are convenient to return to the middle part of the large particle containing cavity 400 again, and the stirring column 5 is convenient to extrude the large particle materials again; after the lifting piece 8 drives the stirring column 5 to reciprocate up and down for a plurality of times, more small particle materials enter the small particle accommodating cavity 401, and then the small particle materials in the small particle accommodating cavity 401 are taken out;
finally, the large-particle materials and a small amount of small-particle materials in the large-particle containing cavity 400 are stirred and then subjected to final pickling, the stirring column 5 rotates in the process, and the lifting piece 8 can drive the stirring column 5 to move up and down so that the bottom of the stirring column 5 extrudes the large-particle materials to facilitate crushing the large-particle materials, so that pickling efficiency is increased.
As a preferred embodiment of the invention, the screening ring 6 is rotatably arranged on the pickling cylinder 4, and the rotation axis of the screening ring 6 is coaxial with the rotation axis of the stirring column 5, so that the pickling efficiency is improved, and meanwhile, the small-particle materials and the large-particle materials are conveniently distinguished.
As a preferred embodiment of the present invention, the inner diameter of the large particle receiving chamber 400 is gradually reduced from top to bottom, so that the small particle material is conveniently introduced into the small particle receiving chamber 401 through the distribution holes 60.
In some embodiments, it is preferable to further include a vertical stirring rod 10, where the vertical stirring rod 10 is vertically slidably mounted on the bottom of the stirring column 5, and the vertical stirring rod 10 has a portion extending out of the stirring column 5, and the vertical bottom of the vertical stirring rod 10 is in contact with the bottom of the stirring cavity 40;
specifically, a vertical accommodating hole 50 is formed in the lower bottom surface of the stirring column 5, a limiting chute 51 is formed in the side wall of the accommodating hole 50 along the vertical direction, a sliding block 11 is arranged on the top surface of the vertical stirring rod 10, the sliding block 11 is matched with the limiting chute 51, the vertical stirring rod 10 vertically moves up and down in the accommodating hole 50, and the limiting chute 51 is used for preventing the vertical stirring rod 10 from sliding out of the accommodating hole 50;
when the lifting member 8 drives the stirring column 5 to move up and down, the bottom of the vertical stirring rod 10 is always in contact with the bottom of the large particle containing cavity 400, and the vertical stirring rod 10 moves vertically in the containing hole 50 along with the lifting of the lifting member 8.
In some embodiments, it is preferable that the outer side wall of the vertical stirring rod 10 is provided with stirring blades 12, so as to further improve the pickling efficiency.
In some embodiments, the stirring device further comprises a stirring fan 13, wherein the stirring fan 13 is detachably mounted on the outer side wall of the stirring column 5 in a clamping manner, when the stirring column 5 moves downwards to the bottommost end, the stirring fan 13 is in contact with the upper surface of the screening ring 6, four stirring fan 13 blades are arranged, and a certain distance is reserved between any two adjacent blades, so that on one hand, the stirring effect is improved, and on the other hand, the collection of small particle materials in the small particle containing cavity 130 is facilitated.
In some embodiments, it is preferable that the stirring fan 13 blade is provided with a containing cavity 130, the upper surface and the lower surface of the stirring fan 13 blade are respectively provided with a blanking hole 131 and a liquid leakage hole 132, the blanking hole 131 and the liquid leakage hole 132 are both communicated with the containing cavity 130, the aperture of the blanking hole 131 is 3-4 times of the particle size of the small particle material, the blanking hole 131 is used for leaking the material in the small particle containing cavity 401 to the containing cavity 130, the aperture of the liquid leakage hole 132 is smaller than the particle size of the minimum particle material, and the liquid leakage hole 132 is used for discharging the liquid in the containing cavity 130; preferably, the thickness of stirring fan 13 leaf is from the first side of stirring fan 13 leaf to the second side of stirring fan 13 leaf thickness gradually thicken, first side and second side are along the radial of stirring fan 13 leaf, and then be convenient for to the collection of granule material, stirring fan 13 leaf can be installed on spliced pole 5 through joint or other modes, and then be convenient for take out of granule material, avoid granule material to enter into granule holding chamber 401 again in the stirring process, and then in the stirring process of stirring pole 5 upwards remove the in-process speed can be great and then be convenient for big granule material remove to the below of stirring pole 5 through the pressure differential change in the big granule holding chamber 400, and then be convenient for the extrusion to big granule material when stirring pole 5 moves down once more, further increase the pickling efficiency of big granule material.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. A purification device for photovoltaic material crystalline silicon preparation, its characterized in that includes frame, pickling section of thick bamboo, stirring post, divides sieve ring, stirring post, mounting panel, lifter, wherein:
the acid washing cylinder is arranged on the frame, the acid washing cylinder is provided with a stirring cavity, the screening ring is arranged on the inner wall of the stirring cavity, the screening ring divides the stirring cavity into a large particle containing cavity and a small particle containing cavity, the large particle containing cavity is positioned below the small particle containing cavity, the screening ring is provided with a material separating hole, and small particle materials in the large particle containing cavity enter the small particle containing cavity through the screening ring;
the lifting piece is arranged on the frame, the mounting plate is arranged at the lower end of the lifting piece, the stirring column is vertically rotatably arranged on the mounting plate, the stirring column is used for stirring the mixture in the stirring cavity, and the lifting piece is used for driving the stirring column to move up and down relative to the stirring cavity;
the stirring fan is arranged on the outer side wall of the stirring column, and when the stirring column moves downwards to the bottommost end, the stirring fan is in contact with the upper surface of the screening ring;
the stirring fan blade is provided with a material accommodating cavity, the upper surface and the lower surface of the stirring fan blade are respectively provided with a blanking hole and a liquid leakage hole, the blanking holes are communicated with the accommodating cavity, the blanking holes are used for enabling materials in the small particle accommodating cavity to leak to the accommodating cavity, and the liquid leakage holes are used for discharging liquid in the accommodating cavity.
2. The purification apparatus for the production of crystalline silicon of photovoltaic material according to claim 1, wherein the screening ring is rotatably mounted on the acid wash drum with the screening ring rotation axis coaxial with the stirring column rotation axis.
3. The purification device for preparing crystalline silicon of a photovoltaic material according to claim 1, wherein the range of values of the pore diameters of the material dividing holes is: 45um-80um.
4. The purification apparatus for the production of crystalline silicon of photovoltaic material according to claim 1, further comprising a driving member mounted on the mounting plate and configured to rotate the stirring column.
5. The purifying apparatus for use in the preparation of crystalline silicon of photovoltaic material according to claim 1, further comprising a heating member mounted on the frame and adapted to heat the stirring column.
6. The purifying apparatus for crystalline silicon production of photovoltaic material according to claim 1, wherein the inner diameter of the large particle accommodation chamber becomes gradually smaller from top to bottom.
7. The purification device for crystalline silicon production of photovoltaic material of claim 1, further comprising a vertical stirring rod mounted to the bottom of the stirring column in a vertically sliding manner, the vertical stirring rod having a portion extending out of the stirring column, the bottom of the vertical stirring rod being in contact with the bottom of the receiving cavity, the stirring column being moved downward, the vertical stirring rod sliding vertically with respect to the stirring column.
8. The purification device for crystalline silicon production of photovoltaic material according to claim 7, wherein the outer side wall of the vertical stirring rod is provided with stirring blades.
9. The purifying apparatus for producing crystalline silicon of photovoltaic material according to claim 1, wherein the thickness of the stirring blade becomes thicker gradually from a first side face of the stirring blade to a second side face of the stirring blade, the first side face and the second side face being along a radial direction of the stirring blade.
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| FR2944520B1 (en) * | 2009-04-17 | 2011-05-20 | Similelt | PROCESS AND INSTALLATION FOR THE PURIFICATION OF METALLURGICAL SILICON. |
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