CN102842648A - Method for carrying out desilvering processing on waste solar cell slice - Google Patents
Method for carrying out desilvering processing on waste solar cell slice Download PDFInfo
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- CN102842648A CN102842648A CN2012102841479A CN201210284147A CN102842648A CN 102842648 A CN102842648 A CN 102842648A CN 2012102841479 A CN2012102841479 A CN 2012102841479A CN 201210284147 A CN201210284147 A CN 201210284147A CN 102842648 A CN102842648 A CN 102842648A
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- slice
- clean
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- silver
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
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- Silicon Compounds (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a method for carrying out desilvering processing on a waste solar cell slice and relates to a solar silicon slice washing technology. The method comprises the following steps of: a, washing the surface of the waste solar cell slice clean; b, soaking the waste solar cell slice in hydrochloric acid for 2 to 5 hours to remove an aluminium back surface field, wherein the analytical pure content of the hydrochloric acid is 36 percent to 38 percent; c, flushing the silicon slice subjected to removal of the aluminium back surface field clean by pure water, placing the silicon slice into aqua regia to soak for 2 to 5 hours and removing a silver electrode on the upper surface of the silicon slice; d, according to a volume ratio of the aqua regia to HF (Hydrogen Fluoride) of (16 to 20):1, adding the HF into the aqua regia, placing the silicon slice subjected to removal of the silver electrode into the mixture to soak for 2 to 5 hours and removing a silicon nitride blue film on the surface of the silicon slice to obtain a clean desilvered slice, wherein the analytical pure HF content of the HF is between 42 percent to 50 percent; and e, flushing the desilvered slice clean by pure water to obtain the clean desilvered slice. The method has the beneficial effects that aluminium, silver and silicon nitride on the upper surface of the cell slice are independently processed by the properties of different types of acid; in the processing process, the effect of sufficient reaction, low processing cost and high efficiency can be obtained; the production cost of a silicon ingot can be effectively reduced; and the furnace throwing quantity is increased, so that the aim of effciency improving is fulfilled.
Description
Technical field
The present invention relates to solar energy single crystal, polysilicon chip technology manufacturing field, especially relate to solar energy single crystal, that polysilicon chip is washed material is technological.
Background technology
Solar energy industry is a rising industry, and Along with people's is to the increasing of environmental protection attention dynamics, and solar energy industry develops rapidly especially.The silica-based battery sheet of photovoltaic solar is one of green energy resource of popularizing at present, and the waste battery sheet produces in production process, has apparatus and process, human error etc. to cause, and the waste battery sheet can not reach throwing stove ingot casting standard must be to its pickling processes.Pickling in the market is generally hydrofluoric acid and adds the ammonium fluoride immersion, and processing cost is high, and poor processing effect is thrown stove has certain influence to the silicon ingot quality.Add the hydrofluoric acid immersion through salt soak, chloroazotic acid and totally can obtain the clean silver strip that moves back with pure water rinsing again.
Summary of the invention
The purpose of this invention is to provide a kind of useless solar battery sheet and move back silver-colored processing method, it has overcome the defective of prior art, and processing cost is low and meet next procedure and throw the stove standard.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
Useless solar battery sheet moves back silver-colored processing method, it is characterized in that comprising the steps: that a is with solar energy waste battery sheet surface wash clean; B carried on the back the field with aluminium in 2-5 hour with the salt soak and removes, and wherein, hydrochloric acid refers to analyze pure content 36%-38%; Silicon chip after the removal of the c aluminium back of the body (containing the blue film of silver electrode and silicon nitride) is clean with pure water rinsing, puts into chloroazotic acid and soaks 2-5 hour, removes silver electrode above the silicon chip; D adds HF (hydrofluoric acid) in the ratio of chloroazotic acid and HF (hydrofluoric acid) volume ratio 16-20:1 in chloroazotic acid, the silicon chip of removing silver electrode is inserted soaked 2-5 hour, removes the blue film of surfaces nitrided silicon, obtains the clean silver strip that moves back; Said HF (hydrofluoric acid) refers to analyze pure HF content 42%-50%; E moves back silver strip and obtains moving back silver strip with pure water rinsing after clean.
The objective of the invention is and can further realize through following scheme:
Said ratio in chloroazotic acid and HF volume ratio 18:1 adds HF in chloroazotic acid.Said hydrochloric acid refers to analyze pure content: 36%-38%.
Said chloroazotic acid (nitrohydrochloric acid) refers to that its ratio of mixed liquor of hydrochloric acid and nitric acid is a hydrochloric acid: nitric acid=3:1, wherein, content of hydrochloric acid: analyze pure 36%-38%, nitric acid content: analyze pure 68%-70%.
Said pure water can be standard compliant any pure water, specifically is meant: pure water is the deionization pure water, and resistivity is that 10 megaohm mommes are to 18 megaohm mommes.
Described silicon nitride is high-purity monocrystalline silicon nitride.
The invention has the beneficial effects as follows: be the aluminium above the battery sheet, silver, silicon nitride to be carried out individual processing, can be fully reacted during processing that processing cost is low, efficient is high through the character of different acid.Can effectively reduce the silicon ingot production cost, make and throw the purpose that the increase of stove amount reaches synergy.
Embodiment
In order to make those skilled in the art person understand the present invention program better, and make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with embodiment the present invention done further detailed explanation.
Embodiment:
Useless solar battery sheet moves back silver-colored processing method, progressive successively following steps:
The first step: with solar energy waste battery sheet surface wash clean (mainly being to remove dust, metal, greasy dirt);
Second step: the gaily decorated basket that the battery sheet will be housed is put into soaking compartment (every groove bubble material 30KG) and is poured pure water and hydrochloric acid into, hydrochloric acid: water=1:15,30 liters in hydrochloric acid 2 premium on currency.Hydrochloric acid is to analyze pure content: 36%-38%; Soaked 2-5 hour.Remove surfaces of aluminum back of the body field.Reaction equation is shown in the formula 1: 2Al+6HCl=2AlCl
3+ 3H
2↑.
Its advantage is: hydrochloric acid and reactive aluminum form hydrogen rapidly, effectively remove aluminium back of the body field, carry out place mat for moving back silver.
The 3rd step: preparation chloroazotic acid (hydrochloric acid and nitric acid mixed liquor) hydrochloric acid: nitric acid=3:1,27 liters of hydrochloric acid, 9 liters in nitric acid, with the battery sheet that has moved back aluminium with pure water (resistivity 10-18 megaohm momme.) put into chloroazotic acid after rinsing well and soak, to soak 2-5 hour, each hour stirs once.Remove the silver electrode above the battery sheet.Chloroazotic acid refers to that its ratio of mixed liquor of hydrochloric acid and nitric acid is a hydrochloric acid: nitric acid=3:1, content of hydrochloric acid: analyze pure 36%-38%.Nitric acid content: analyze pure 68%-70%.Reaction equation is shown in the formula 2: Ag+HNO
3+ HCl=AgCl+NO
2↑+H
2O.
Its advantage is: chloroazotic acid and the silver efficient height that is swift in response, later collection silver is carried out place mat.
The 4th step: the reaction back adds in chloroazotic acid removed surperficial blue rete in 2 liters of hydrofluoric acid dips 2-5 hours, and hydrofluoric acid refers to analyze pure content: 42%-50%.Reaction equation is shown in the formula 3: SiN
4+ 4HF+9H
2O=3H
2SiO
3↓+4NH4F.
Its advantage is: hydrofluoric acid can handled under the mixed liquor of chloroazotic acid and hydrofluoric acid totally mixing of fast efficient height of silicon nitride reaction and battery sheet surface.
The 5th step: will move back battery sheet behind the silver and totally finally wait until with pure water rinsing and move back silver strip.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (4)
1. useless solar battery sheet moves back silver-colored processing method, it is characterized in that comprising the steps: that a is with solar energy waste battery sheet surface wash clean; B carried on the back the field with aluminium in 2-5 hour with the salt soak and removes, and wherein, hydrochloric acid refers to analyze pure content 36%-38%; Silicon chip after the removal of the c aluminium back of the body is clean with pure water rinsing, puts into chloroazotic acid and soaks 2-5 hour, removes silver electrode above the silicon chip; D adds HF in the ratio of chloroazotic acid and HF volume ratio 16-20:1 in chloroazotic acid, the silicon chip of removing silver electrode is inserted soaked 2-5 hour, removes the blue film of surfaces nitrided silicon, obtains the clean silver strip that moves back; Said HF refers to analyze pure HF content 42%-50%; E moves back silver strip and obtains moving back silver strip with pure water rinsing after clean.
2. useless solar battery sheet according to claim 1 moves back silver-colored processing method, it is characterized in that: said ratio in chloroazotic acid and HF volume ratio 18:1 adds HF in chloroazotic acid.
3. useless solar battery sheet according to claim 1 and 2 moves back silver-colored processing method; It is characterized in that: said chloroazotic acid refers to the mixed liquor of hydrochloric acid and nitric acid, and its ratio is a hydrochloric acid: nitric acid=3:1, wherein; Content of hydrochloric acid: analyze pure 36%-38%, nitric acid content: analyze pure 68%-70%.
4. useless solar battery sheet according to claim 1 moves back silver-colored processing method, it is characterized in that: said pure water is meant: pure water is the deionization pure water, and resistivity is that 10 megaohm mommes are to 18 megaohm mommes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102841479A CN102842648A (en) | 2012-08-12 | 2012-08-12 | Method for carrying out desilvering processing on waste solar cell slice |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102841479A CN102842648A (en) | 2012-08-12 | 2012-08-12 | Method for carrying out desilvering processing on waste solar cell slice |
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| Publication Number | Publication Date |
|---|---|
| CN102842648A true CN102842648A (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102841479A Pending CN102842648A (en) | 2012-08-12 | 2012-08-12 | Method for carrying out desilvering processing on waste solar cell slice |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779441A (en) * | 2013-11-13 | 2014-05-07 | 河南科技学院 | Cleaning recovery treatment process of solar cell sheet |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB931336A (en) * | 1959-08-06 | 1963-07-17 | Monsanto Chemicals | Improvements in or relating to boron phosphide |
| CN1851016A (en) * | 2006-05-30 | 2006-10-25 | 姜益群 | Silicon waste-slice surface metal removal and noblemetal silver-platinum-gold recovery method |
| CN101671026A (en) * | 2009-09-29 | 2010-03-17 | 包头市山晟新能源有限责任公司 | Pickling impurity removal method and equipment and method and system for purifying polysilicon |
| CN102295289A (en) * | 2011-06-01 | 2011-12-28 | 宁夏银星多晶硅有限责任公司 | Hydrometallurgical purification process of metal impurities in metallurgical polysilicon |
-
2012
- 2012-08-12 CN CN2012102841479A patent/CN102842648A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB931336A (en) * | 1959-08-06 | 1963-07-17 | Monsanto Chemicals | Improvements in or relating to boron phosphide |
| CN1851016A (en) * | 2006-05-30 | 2006-10-25 | 姜益群 | Silicon waste-slice surface metal removal and noblemetal silver-platinum-gold recovery method |
| CN101671026A (en) * | 2009-09-29 | 2010-03-17 | 包头市山晟新能源有限责任公司 | Pickling impurity removal method and equipment and method and system for purifying polysilicon |
| CN102295289A (en) * | 2011-06-01 | 2011-12-28 | 宁夏银星多晶硅有限责任公司 | Hydrometallurgical purification process of metal impurities in metallurgical polysilicon |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779441A (en) * | 2013-11-13 | 2014-05-07 | 河南科技学院 | Cleaning recovery treatment process of solar cell sheet |
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Application publication date: 20121226 |