CN107716431A - A kind of polycrystalline sheet stock cleaning method - Google Patents

A kind of polycrystalline sheet stock cleaning method Download PDF

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Publication number
CN107716431A
CN107716431A CN201711036945.9A CN201711036945A CN107716431A CN 107716431 A CN107716431 A CN 107716431A CN 201711036945 A CN201711036945 A CN 201711036945A CN 107716431 A CN107716431 A CN 107716431A
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China
Prior art keywords
fragment material
fragment
sheet stock
cleaning method
polycrystalline
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CN201711036945.9A
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Chinese (zh)
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CN107716431B (en
Inventor
姚翠云
孟涛
路景刚
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Jiangsu Meike Solar Technology Co Ltd
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Zhenjiang Huantai Silicon Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/30—Combinations with other devices, not otherwise provided for

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Cleaning In General (AREA)
  • Silicon Compounds (AREA)

Abstract

The invention discloses a kind of polycrystalline sheet stock cleaning method, removed one by one for various non-silicon impurities in fragment material, it not only can effectively remove the impurity contained in polycrystalline chip material and the slurry of surface attachment, metal etc., lift the cleaning quality of fragment material, so that the quality of polycrystalline chip material reaches the requirement of high-purity silicon material, while sorting labor strength can be reduced, improve production efficiency and economic benefit.

Description

A kind of polycrystalline sheet stock cleaning method
Technical field
The present invention relates to a kind of polycrystalline sheet stock cleaning method, applied to the semi-automatic post of cooking process.
Background technology
Polycrystalline sheet stock is the fragment that the small side's ingot of polycrystalline is formed after mortar cutting or Buddha's warrior attendant wire cutting, is contained in its fragment There are a large amount of non-silicon impurities（Glass, adhesive tape, steel wire, screw etc.）, slurry, metal ion, oxide layer, conventional method are also adhered in surface Uniformly take alkali cleaning --- rinsing --- nitration mixture neutralization --- rinsing --- drying --- sorting --- packaging, usual this method There are the non-silicon impurities of alkaline spot, water spots, and glass, adhesive tape, steel wire, screw etc. in the fractal surfaces cleaned out, worker sorts difficult Degree is big, and is difficult to all sub-elect, and fragment material quality is unable to reach high-purity requirement, then to melt down quality fluctuation big.
The content of the invention
The defects of it is an object of the invention to overcome prior art, there is provided one kind is for non-silicon present in polycrystalline chip material The cleaning method that impurity removes one by one, to improve polycrystalline sheet stock purity.
The present invention specifically adopts the following technical scheme that：
The first step：Fragment material suctions out the Ferromagnetic Impurities wherein contained by magnetic roller type conveyer belt tramp iron separator；
Second step：By the non-ferrous metal filter using electromagnetic coupled balance reception principle, the metal impurities in fragment are gone Remove；
3rd step：Using 800-850 degree high-temperature calcinations, by substance decomposition containing glue in fragment material into powdered；
4th step：Fragment material 24h-48h is soaked using pure hydrofluoric acid solution more than 70% concentration, by glass biodissolution in fragment material And remove fragment material surface oxide layer；
5th step：Corrode fragment material using sodium hydrate aqueous solution more than 99% purity, dosage is per the corrosion of 4kg sodium hydroxides Fragment material 30kg, removes slurry, impurity of fragment material surface attachment etc., and etching time was controlled in 3-4 minutes；
6th step：Using hydrofluoric acid and hydrochloric acid by weight 1:The solution that 5 ratios neutralize rinses to fragment material, then carries out Drying, sorting, packaging.
By improvement of the present invention to polycrystalline chip material cleaning method, gone one by one for various non-silicon impurities in fragment material Remove, not only can effectively remove the impurity contained in polycrystalline chip material and the slurry of surface attachment, metal etc., lift fragment material Cleaning quality so that the quality of polycrystalline chip material reaches the requirement of high-purity silicon material, while can reduce sorting labor strength, Improve production efficiency and economic benefit.
Embodiment
Embodiment one
The high-purity polycrystalline sheet stock cleaning method of the present invention comprises the following steps：
The first step：Fragment material suctions out by magnetic roller type conveyer belt tramp iron separator wherein contains Ferromagnetic Impurities, the magnetic field intensity of magnetic roller For background 14000GS, gradient 18000GS；
Second step：By the non-ferrous metal filter using electromagnetic coupled balance reception principle, the metal impurities in fragment are gone Remove；
3rd step：Using 800 degree of high-temperature calcinations, by substance decomposition containing glue in fragment material into powdered；
4th step：Fragment material 48h is soaked using the pure hydrofluoric acid solution of 70% concentration, by glass biodissolution in fragment material and removes table Face oxide layer；
5th step：Corrode fragment material using sodium hydroxide solution more than 99% purity, dosage is broken per the corrosion of 4kg sodium hydroxides Sheet stock 30kg, removes slurry, impurity of fragment material surface attachment etc., and etching time is controlled in 3-4 minutes, can corroded in theory The picometre of silicon face 2.5.
6th step：Using hydrofluoric acid and hydrochloric acid by weight 1:The solution that 5 ratios neutralize rinses to fragment material, then Dried, sorted, packed.
Embodiment two
The high-purity polycrystalline sheet stock cleaning method of the present invention comprises the following steps：
The first step：Fragment material suctions out by magnetic roller type conveyer belt tramp iron separator wherein contains Ferromagnetic Impurities, the magnetic field intensity of magnetic roller For background 14000GS, gradient 18000GS；
Second step：By the non-ferrous metal filter using electromagnetic coupled balance reception principle, the metal impurities in fragment are gone Remove；
3rd step：Using 825 degree of high-temperature calcinations, by substance decomposition containing glue in fragment material into powdered；
4th step：Fragment material 36h is soaked using the pure hydrofluoric acid solution of 73% concentration, by glass biodissolution in fragment material and removes table Face oxide layer；
5th step：Corrode fragment material using sodium hydroxide solution more than 99% purity, dosage is broken per the corrosion of 4kg sodium hydroxides Sheet stock 30kg, removes slurry, impurity of fragment material surface attachment etc., and etching time is controlled in 3-4 minutes, can corroded in theory The picometre of silicon face 2.5；
6th step：Using hydrofluoric acid and hydrochloric acid by weight 1:The solution that 5 ratios neutralize rinses to fragment material, then carries out Drying, sorting, packaging.
Embodiment three
The high-purity polycrystalline sheet stock cleaning method of the present invention comprises the following steps：
The first step：Fragment material suctions out by magnetic roller type conveyer belt tramp iron separator wherein contains Ferromagnetic Impurities, the magnetic field intensity of magnetic roller For background 14000GS, gradient 18000GS；
Second step：By the non-ferrous metal filter using electromagnetic coupled balance reception principle, the metal impurities in fragment are gone Remove；
3rd step：Using 850 degree of high-temperature calcinations, by substance decomposition containing glue in fragment material into powdered；
4th step：Fragment material 24h is soaked using the pure hydrofluoric acid solution of 75% concentration, by glass biodissolution in fragment material and removes table Face oxide layer；
5th step：Corrode fragment material using sodium hydroxide solution more than 99% purity, dosage is broken per the corrosion of 4kg sodium hydroxides Sheet stock 30kg, removes slurry, impurity of fragment material surface attachment etc., and etching time is controlled in 3-4 minutes, can corroded in theory The picometre of silicon face 2.5.
6th step：Using hydrofluoric acid and hydrochloric acid by weight 1:The solution that 5 ratios neutralize rinses to fragment material, then Dried, sorted, packed.

Claims (3)

1. a kind of polycrystalline sheet stock cleaning method, it is characterised in that comprise the following steps：
The first step：Fragment material suctions out the Ferromagnetic Impurities wherein contained by magnetic roller type conveyer belt tramp iron separator；
Second step：By the non-ferrous metal filter using electromagnetic coupled balance reception principle, the metal impurities in fragment are gone Remove；
3rd step：Using 800-850 degree high-temperature calcinations, by substance decomposition containing glue in fragment material into powdered；
4th step：Fragment material 24h-48h is soaked using pure hydrofluoric acid solution more than 70% concentration, by glass biodissolution in fragment material And remove fragment material surface oxide layer；
5th step：Corrode fragment material using sodium hydrate aqueous solution more than 99% purity, dosage is per the corrosion of 4kg sodium hydroxides Fragment material 30kg, removes slurry, impurity of fragment material surface attachment etc., and etching time was controlled in 3-4 minutes；
6th step：Using hydrofluoric acid and hydrochloric acid by weight 1:The solution that 5 ratios neutralize rinses to fragment material, then carries out Drying, sorting, packaging.
2. polycrystalline sheet stock cleaning method as claimed in claim 1, it is characterised in that the 5th step, silicon face corrosion depth are 2.5 Picometre.
3. polycrystalline sheet stock cleaning method as claimed in claim 1, it is characterised in that the first step, the magnetic field intensity of magnetic roller is background 14000GS, gradient 18000GS.
CN201711036945.9A 2017-10-30 2017-10-30 Polycrystalline sheet stock cleaning method Active CN107716431B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711036945.9A CN107716431B (en) 2017-10-30 2017-10-30 Polycrystalline sheet stock cleaning method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711036945.9A CN107716431B (en) 2017-10-30 2017-10-30 Polycrystalline sheet stock cleaning method

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CN107716431A true CN107716431A (en) 2018-02-23
CN107716431B CN107716431B (en) 2020-02-14

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108910891A (en) * 2018-08-02 2018-11-30 镇江环太硅科技有限公司 A kind of high quality polycrystalline silicon material processing method
CN109112638A (en) * 2018-10-10 2019-01-01 镇江环太硅科技有限公司 A kind of method of sheet stock recycling and reusing fine crushing
CN109950137A (en) * 2019-04-11 2019-06-28 江苏美科硅能源有限公司 One kind is for handling cutting belt adhesive tape fragment material processing method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1994877A (en) * 2006-12-26 2007-07-11 朱喜斌 Chemical method for promoting silicon metal purity
CN102694074A (en) * 2012-06-08 2012-09-26 英利能源（中国）有限公司 Method for cleaning waste silicon material generated in silicon wafer treatment process
CN103011168A (en) * 2011-09-23 2013-04-03 上海普罗新能源有限公司 Cleaning method of polycrystalline silicon raw material
CN103406344A (en) * 2013-08-28 2013-11-27 河北宁晋松宫半导体有限公司 Treatment method for linearly-chopped silicon wafer impurities
CN104176737A (en) * 2014-08-07 2014-12-03 佳明新材料科技有限公司 Method for recovering silicon powder from cut mortar waste
CN105887206A (en) * 2016-06-26 2016-08-24 河南盛达光伏科技有限公司 Method for cleaning debris in monocrystal silicon wire-cut electrical discharge machining

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1994877A (en) * 2006-12-26 2007-07-11 朱喜斌 Chemical method for promoting silicon metal purity
CN103011168A (en) * 2011-09-23 2013-04-03 上海普罗新能源有限公司 Cleaning method of polycrystalline silicon raw material
CN102694074A (en) * 2012-06-08 2012-09-26 英利能源（中国）有限公司 Method for cleaning waste silicon material generated in silicon wafer treatment process
CN103406344A (en) * 2013-08-28 2013-11-27 河北宁晋松宫半导体有限公司 Treatment method for linearly-chopped silicon wafer impurities
CN104176737A (en) * 2014-08-07 2014-12-03 佳明新材料科技有限公司 Method for recovering silicon powder from cut mortar waste
CN105887206A (en) * 2016-06-26 2016-08-24 河南盛达光伏科技有限公司 Method for cleaning debris in monocrystal silicon wire-cut electrical discharge machining

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108910891A (en) * 2018-08-02 2018-11-30 镇江环太硅科技有限公司 A kind of high quality polycrystalline silicon material processing method
CN109112638A (en) * 2018-10-10 2019-01-01 镇江环太硅科技有限公司 A kind of method of sheet stock recycling and reusing fine crushing
CN109950137A (en) * 2019-04-11 2019-06-28 江苏美科硅能源有限公司 One kind is for handling cutting belt adhesive tape fragment material processing method

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Effective date of registration: 20201217

Address after: No.198 Guangming Road, Yangzhong Economic Development Zone, Zhenjiang City, Jiangsu Province

Patentee after: Jiangsu Meike Solar Energy Technology Co.,Ltd.

Address before: 212200 new materials Industrial Park, Yangzhong Youfang Town, Zhenjiang City, Jiangsu Province

Patentee before: ZHENJIANG HUANTAI SILICON TECHNOLOGY Co.,Ltd.

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Address after: 212200 No. 198 Guangming Road, Yangzhong Economic Development Zone, Zhenjiang City, Jiangsu Province

Patentee after: Jiangsu Meike Solar Energy Technology Co., Ltd

Address before: 212200 No. 198 Guangming Road, Yangzhong Economic Development Zone, Zhenjiang City, Jiangsu Province

Patentee before: Jiangsu Meike Solar Energy Technology Co., Ltd