CN108339831A - The method of disposal of silicon solar cell - Google Patents
The method of disposal of silicon solar cell Download PDFInfo
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- CN108339831A CN108339831A CN201810136650.7A CN201810136650A CN108339831A CN 108339831 A CN108339831 A CN 108339831A CN 201810136650 A CN201810136650 A CN 201810136650A CN 108339831 A CN108339831 A CN 108339831A
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- solar cell
- silicon solar
- silicon
- filter residue
- disposal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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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
- Y02W30/20—Waste processing or separation
Abstract
The invention discloses a kind of methods of disposal of silicon solar cell comprising：Machinery removes glass after silicon solar cell component is carried out high-temperature heat treatment, obtains the silicon solar cell component of organic matter and glass and is immersed in the mixed solution of sulfuric acid and copper sulphate, the first filtrate and the first filter residue is obtained by filtration；It is filtered after hydrogen peroxide and basic copper carbonate is added into the first filtrate, obtains stannic acid precipitation and the second filtrate；SnO will be obtained after stannic acid precipitation calcining2Powder；Copper wire in first filter residue is taken out into cleaning, remaining first filter residue is leached after rinsing with nitric acid, is obtained leachate and is removed the cell piece of silver；Sodium chloride or hydrochloric acid is added to leachate, obtains silver chlorate；The cell piece of silver will be gone to be sequentially placed into alkaline solution to remove aluminum back electrode, be put into phosphoric acid and remove silicon nitride, be put into alkaline solution and remove emitter, obtain silicon chip.Method provided by the invention plays comprehensive recycling to silicon solar cell, and neither waste of resource in turn avoids generating larger pollution.
Description
Technical field
The present invention relates to technical field of solar batteries more particularly to a kind of methods of disposal of silicon solar cell.
Background technology
Present Global energy crisis and atmosphere polluting problem become increasingly conspicuous, and sight is all invested regenerative resource by the whole world,
Wherein solar energy becomes people's focus of attention with its exclusive advantage.Abundant solar radiant energy is important the energy, takes
Not to the utmost, it is nexhaustible, be the energy that the mankind can freely utilize.There are mainly three types of the direct Land use systems of solar energy：Photo-thermal
Conversion, photochemical transformation and opto-electronic conversion.Solar water heating system is the typical case of photothermal conversion, is answered extensively at present
With.Photochemical convertion is substantially at laboratory stage, than it is more typical be exactly photochemistry hydrogen manufacturing.Photoelectric conversion is then solar energy
Using one of most important direction, main forms are photovoltaic generation.
Solar cell principle is mixed using diffusion technique in silicon crystal mainly using Semiconducting Silicon Materials as matrix
Impurity：When mixing the impurity such as boron, phosphorus, n type semiconductors will be formed there is a hole in silicon crystal；Equally, it mixes
After phosphorus atoms, p-type semiconductor will be formed there are one electronics in silicon crystal, p-type semiconductor is incorporated in one with n-type semiconductor
It rises and forms pn-junction, after solar irradiation radiosilicon crystal, the hole of n-type semiconductor is moved toward p-type area in pn-junction, and in p-type area
Electronics is moved toward n-type area, and to form the electric current from n-type area to p-type area, potential difference is formed in pn-junction, which forms
Solar cell.
The life cycle of solar cell is generally 25 years, when transformation efficiency reduces to a certain extent, solar cell
Failure becomes substandard solar cell, needs to scrap the qualified solar cell of update, under normal circumstances, solar energy by regarding
For a kind of energy of waste yield minimum, environmentally harmful waste, but the sun not will produce during the use of component
The solid waste that energy battery generates after scrapping can not be ignored.After the year two thousand twenty, the solid of the solar cell in China
Waste, which will appear, to increase substantially, and accumulative discarded amount also gradually increases, and the processing disposition and recycling of solar cell will
An important environmental protection subject can be become.Meanwhile it can be produced due to various in the production process of solar cell
Raw a large amount of substandard solar cell, currently, for the substandard solar cell and production process of use later failure
The substandard solar cell of middle generation is mostly by the way of concentrating destruction.In solar cell containing silicon, silver, aluminium,
Copper, tin, lead and other elements, moreover, the content of the valuable metals such as silver, aluminium, copper, tin is even beyond these metallic elements in mineral
Content can not only cause the huge waste of raw material, and the battery remaining after destruction if solar cell directly destroyed
Slag can also generate pollution (such as lead element) to environment.
Invention content
The main purpose of the present invention is to provide a kind of methods of disposal of silicon solar cell, it is intended to solve solar-electricity
Pond is directly destroyed, and can not only cause the huge waste of raw material, and the battery residue after destruction can also generate pollution to environment
The technical issues of.
To achieve the above object, the method for disposal of silicon solar cell provided by the invention, includes the following steps：
A, machinery remove the aluminium frame and terminal box for the silicon solar cell that need to be recycled, obtain silicon solar cell component；
Silicon solar cell component progress high-temperature heat treatment is made EVA adhesive film in silicon solar cell component and organic by B
Backboard volatilizees；
After C, EVA adhesive film and the volatilization of organic backboard, machinery removes glass, obtains the silicon sun electricity of organic matter and glass
Pond component and being immersed in the mixed solution of sulfuric acid and copper sulphate is ultrasonically treated, and is filtered after supersound process
To the first filtrate and the first filter residue, wherein the first filter residue includes copper wire, lead sulfate and cell piece；
D is filtered after hydrogen peroxide and basic copper carbonate is added into the first filtrate, obtains stannic acid precipitation and the second filtrate；
E will obtain SnO after stannic acid precipitation calcining2Powder, the second filtrate be added sulfuric acid after return for impregnate go it is organic
The silicon solar cell component of object and glass；
Copper wire in first filter residue is taken out and is cleaned by F, and remaining first filter residue uses nitre after being rinsed with water after taking-up copper wire
Ore Leaching obtains leachate and removes the cell piece of silver, wherein obtaining lead sulfate filter residue after the washing lotion filtering rinsed；
Sodium chloride or hydrochloric acid are added into leachate, obtains silver nitride precipitation by G；
H, the aluminum back electrode that the cell piece of silver will be gone to be sequentially placed into removal cell piece in potassium hydroxide or sodium hydroxide solution
It cleans afterwards, be put into phosphoric acid and cleaned after the silicon nitride of removal cell piece, and be put into potassium hydroxide or sodium hydroxide solution
Except being cleaned after the emitter of cell piece, silicon chip is obtained.
Preferably, the step B includes：
Silicon solar cell component is put into nitrogen or argon gas atmosphere, 450- is risen to the heating rate of 1-30 DEG C/min
550 DEG C, make the EVA adhesive film in silicon solar cell component and the volatilization of organic backboard.
Preferably, further include after the step B：
The organic volatile obtained after volatilization is collected for for heating furnace heat supply.
Preferably, the temperature of phosphoric acid is 150-250 DEG C in the step H, a concentration of 80%-95%.
Preferably, specifically used 50-90 DEG C of deionized water is clear to the cell piece after removing silicon nitride in the step H
It washes.
Preferably, when removing the aluminum back electrode of cell piece in the step H, used potassium hydroxide or sodium hydroxide
A concentration of 40%-50%, temperature be 70-90 DEG C, the removal time be 5-15min.
Preferably, when removing the emitter of cell piece in the step H, used potassium hydroxide or sodium hydroxide
A concentration of 0.01%-20%.
Preferably, when removing the emitter of cell piece in the step H, used potassium hydroxide or sodium hydroxide
A concentration of 0.05%.
Preferably, further comprising the steps of after the step G：
It is leached with ammonia after silver nitride precipitation is cleaned, is used in combination hydrazine hydrate reduction at silver powder.
In technical solution proposed by the present invention, the aluminium frame and terminal box of silicon solar cell are removed by machinery, obtains silicon too
Positive battery component, aluminium frame can recycle, and terminal box, which can be done, scraps processing；Again to silicon solar cell assembly high-temperature heat at
Reason, this EVA adhesive film for play bonding effect on component and organic backboard of protection and insulating effect volatilize；Then will
The front glass panel to shield disassembles, silicon solar cell component only leave silicon substrate, the silver grating line on silicon substrate,
Used solder and aluminum back electrode when playing the tinned wird of confluence, welding tinned wird on a silicon substrate；Then
Silicon solar cell component is immersed in after carrying out sonication filtration in the mixed solution of sulfuric acid and copper sulphate, obtains the first filter
Liquid and the first filter residue, wherein the tin in tinned wird and solder is dissolved into divalent tin ion and enters the first filtrate, and lead is transformed into
Lead sulfate, due to the dissolving of solder, copper wire and silicon substrate are detached, and lead sulfate, copper wire and silicon substrate enter the first filter residue；
After hydrogen peroxide is added into the first filtrate, the tin of dissolving is after being oxidized to tetravalence tin ion, and addition basic copper carbonate improves ph values
Afterwards, tetravalent tin ion is hydrolyzed to stannic acid precipitation, and stannic acid precipitation obtains SnO after calcining2Powder；By copper wire from the first filter residue
The Cu for sorting out and clean to obtain recoverable obtains cell piece after rinsing remaining first filter residue, will clean copper wire
PbSO can be obtained with after the washing lotion filtering of remaining first filter residue4Precipitation, to avoid lead ion from polluting environment；Then,
Cell piece is leached with nitric acid, the silver paste on cell piece generates silver ion with nitric acid reaction and enters leachate, leachate chlorination
AgCl precipitations are obtained after sodium or HCl treatment；Finally the cell piece of silver will be gone to be sequentially placed into the higher potassium hydroxide of concentration or hydrogen
Aluminum back electrode is removed in sodium oxide molybdena, is put into phosphoric acid and removes silicon nitride, and is put into the lower potassium hydroxide of concentration or hydroxide
Emitter (i.e. pn-junction) is removed in sodium, finally obtains the silicon chip that purity is 99.9999%.Method of disposal pair provided by the invention
All parts in silicon solar cell are all handled, and silicon, silver, copper and tin are recycled, and lead is changed into lead sulfate quilt
Centralized collection, silicon solar cell have obtained most comprehensive recycling, and neither waste of resource in turn avoids generating larger dirt to environment
Dye, and recycle the purity nearly 100% of the silicon chip obtained.
Specific implementation mode
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described reality
A part of the embodiment that example is only the present invention is applied, instead of all the embodiments.Based on the embodiments of the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained without creative efforts, belongs to the present invention
The range of protection.
In one embodiment of the present invention, the method for disposal of silicon solar cell includes the following steps：
A, machinery remove the aluminium frame and terminal box for the silicon solar cell that need to be recycled, obtain silicon solar cell component；
Silicon solar cell component progress high-temperature heat treatment is made EVA adhesive film in silicon solar cell component and organic by B
Backboard volatilizees；
Specifically, silicon solar cell component is put into nitrogen or argon gas atmosphere, with the heating rate liter of 1-30 DEG C/min
To 450-550 DEG C, make the EVA adhesive film in silicon solar cell component and the volatilization of organic backboard, the organic volatile obtained after volatilization
Object is also collected for being heating furnace heat supply.
After C, EVA adhesive film and the volatilization of organic backboard, machinery removes glass, obtains the silicon sun electricity of organic matter and glass
Pond component and being immersed in the mixed solution of sulfuric acid and copper sulphate is ultrasonically treated, and is filtered after supersound process
To the first filtrate and the first filter residue, wherein the first filter residue includes copper wire, lead sulfate and cell piece；
D is filtered after hydrogen peroxide and basic copper carbonate is added into the first filtrate, obtains stannic acid precipitation and the second filtrate；
E will obtain SnO after stannic acid precipitation calcining2Powder, the second filtrate be added sulfuric acid after return for impregnate go it is organic
The silicon solar cell component of object and glass；
Specifically, the SnO generated through the above steps2Not only purity is high for powder, but also the rate of recovery of tin is also high.In addition,
Second filtrate can also return after sulfuric acid is added for impregnating the silicon solar cell component for removing organic matter and glass, whole system
In copper sulphate recycled, reduce cost.
Copper wire in first filter residue is taken out and is cleaned by F, and remaining first filter residue uses nitre after being rinsed with water after taking-up copper wire
Ore Leaching obtains leachate and removes the cell piece of silver, wherein obtaining lead sulfate filter residue after the washing lotion filtering rinsed；
Specifically, copper wire is screened from the first filter residue, and uses pickling and washing successively, it is residual on copper wire to remove
The lead stayed.
Sodium chloride or hydrochloric acid are added into leachate, obtains silver nitride precipitation by G；
Further, it is leached with ammonia after silver nitride precipitation being cleaned, is used in combination hydrazine hydrate reduction at silver powder.
H, the aluminum back electrode that the cell piece of silver will be gone to be sequentially placed into removal cell piece in potassium hydroxide or sodium hydroxide solution
It cleans afterwards, be put into phosphoric acid and cleaned after the silicon nitride of removal cell piece, and be put into potassium hydroxide or sodium hydroxide solution
Except being cleaned after the emitter of cell piece, silicon chip is obtained.
Specifically, the temperature of phosphoric acid is 150-250 DEG C, a concentration of 80%-95% in the step H, can be quickly molten
The silicon nitride of solution.Furthermore it is also possible to which the fluoride that weight percent is 0.01-10wt% is added into phosphoric acid, fluoride can be with
For HF, NH4F、NH4HF2At least one of, the phosphoric acid added with fluoride to the corrosion rate of silicon nitride faster.
Further, the cell piece after silicon nitride is gone to be cleaned using 50-90 DEG C of deionized water, it can be to avoid silicon chip
It is cracked, to be applied directly on the production line of solar cell.If die crack, need to melt down as silicon sun electricity
The raw material in pond.
When removing the aluminum back electrode of cell piece in the step H, used potassium hydroxide or sodium hydroxide it is a concentration of
40%-50%, temperature are 70-90 DEG C, and the removal time is 5-15min.
In addition, being turned by chemical mode containing aluminum solutions using what potassium hydroxide or sodium hydroxide removal aluminum back electrode obtained
It turns to aluminium oxide and then is used to prepare electronic aluminum paste, use on production line again.
When removing the emitter of cell piece in the step H, used potassium hydroxide or sodium hydroxide it is a concentration of
0.01%-20%.Removing the alkaline solution concentration used when emitter can not be excessively high, in order to avoid etching is generated to silicon chip, to drop
The rate of recovery of low silicon chip, preferred concentration 0.05% can not only remove pn-junction but also can reduce cost.
In technical solution proposed by the present invention, the aluminium frame and terminal box of silicon solar cell are removed by machinery, obtains silicon too
Positive battery component, aluminium frame can recycle, and terminal box, which can be done, scraps processing；Again to silicon solar cell assembly high-temperature heat at
Reason, this EVA adhesive film for play bonding effect on component and organic backboard of protection and insulating effect volatilize；Then will
The front glass panel to shield disassembles, silicon solar cell component only leave silicon substrate, the silver grating line on silicon substrate,
Used solder and aluminum back electrode when playing the tinned wird of confluence, welding tinned wird on a silicon substrate；Then
Silicon solar cell component is immersed in after carrying out sonication filtration in the mixed solution of sulfuric acid and copper sulphate, obtains the first filter
Liquid and the first filter residue, wherein the tin in tinned wird and solder is dissolved into divalent tin ion and enters the first filtrate, and lead is transformed into
Lead sulfate, due to the dissolving of solder, copper wire and silicon substrate are detached, and lead sulfate, copper wire and silicon substrate enter the first filter residue；
After hydrogen peroxide is added into the first filtrate, the tin of dissolving is after being oxidized to tetravalence tin ion, and addition basic copper carbonate improves ph values
Afterwards, tetravalent tin ion is hydrolyzed to stannic acid precipitation, and stannic acid precipitation obtains SnO after calcining2Powder；By copper wire from the first filter residue
The Cu for sorting out and clean to obtain recoverable obtains cell piece after rinsing remaining first filter residue, will clean copper wire
PbSO can be obtained with after the washing lotion filtering of remaining first filter residue4Precipitation, to avoid lead ion from polluting environment；Then,
Cell piece is leached with nitric acid, the silver paste on cell piece generates silver ion with nitric acid reaction and enters leachate, leachate chlorination
AgCl precipitations are obtained after sodium or HCl treatment；Finally the cell piece of silver will be gone to be sequentially placed into the higher potassium hydroxide of concentration or hydrogen
Aluminum back electrode is removed in sodium oxide molybdena, is put into phosphoric acid and removes silicon nitride, and is put into the lower potassium hydroxide of concentration or hydroxide
Emitter (i.e. pn-junction) is removed in sodium, finally obtains the silicon chip that purity is 99.9999%.Method of disposal pair provided by the invention
All parts in silicon solar cell are all handled, and silicon, silver, copper and tin are recycled, and lead is changed into lead sulfate quilt
Centralized collection, silicon solar cell have obtained most comprehensive recycling, and neither waste of resource in turn avoids generating larger dirt to environment
Dye, and recycle the purity nearly 100% of the silicon chip obtained.
Embodiment 1
The aluminium frame for the silicon solar cell that need to be recycled and terminal box machinery are removed, silicon solar cell component is obtained, by aluminium
Frame, terminal box, silicon solar cell component separately recycle；Then silicon solar cell component is put into heating furnace burner hearth, to burner hearth
In be filled with nitrogen, and rise to 500 DEG C with the heating rate of 10 DEG C/min, EVA adhesive film in silicon solar cell component and organic
Backboard is volatilized, and gas phase color can be used in this process in the fuel after the organic matter collection after volatilization as heating furnace
Spectrometer detects the changes of contents of organic matter in burner hearth, when the content of organic matter no longer changes, illustrates EVA adhesive film and organic back of the body
Plate volatilization is complete；Then glass is removed from silicon solar cell component, obtains the silicon solar cell group of organic matter and glass
Part；Then the silicon solar cell component is immersed in the mixed solution of sulfuric acid and copper sulphate and is ultrasonically treated, is ultrasonically treated
After carry out that the first filtrate and the first filter residue is obtained by filtration, wherein the first filter residue includes copper wire, lead sulfate and cell piece；To
It is filtered after hydrogen peroxide and basic copper carbonate is added in one filtrate, obtains stannic acid precipitation and the second filtrate；After stannic acid precipitation calcining
Obtain SnO2Powder, the second filtrate return after sulfuric acid is added for impregnating the silicon solar cell component for removing organic matter and glass；It will
Copper wire in first filter residue, which takes out, to be cleaned, and remaining first filter residue is leached after being rinsed with water with nitric acid after taking-up copper wire, is soaked
Go out liquid and remove the cell piece of silver, wherein obtaining lead sulfate filter residue after the washing lotion filtering rinsed；Sodium chloride is added into leachate
Or hydrochloric acid, obtain silver nitride precipitation；It will be put into a concentration of 45% after the cell piece cleaning for removing silver again, the hydrogen-oxygen that temperature is 80 DEG C
Change and remove aluminum back electrode in potassium, the removal time is 10min；Then by the cell piece deionized water after removal aluminum back electrode
After cleaning, it is 180 DEG C, in a concentration of 90% phosphoric acid to be put into temperature, and silicon nitride is removed；The battery of silicon nitride will finally be removed
It after piece is cleaned with 60 DEG C of deionized water, is put into a concentration of 0.05% potassium hydroxide and removes pn-junction, obtaining purity is
99.9999% silicon chip.
Embodiment 2
The aluminium frame for the silicon solar cell that need to be recycled and terminal box machinery are removed, silicon solar cell component is obtained, by aluminium
Frame, terminal box, silicon solar cell component separately recycle；Then silicon solar cell component is put into heating furnace burner hearth, to burner hearth
In be filled with nitrogen, and rise to 500 DEG C with the heating rate of 10 DEG C/min, EVA adhesive film in silicon solar cell component and organic
Backboard is volatilized, and gas phase color can be used in this process in the fuel after the organic matter collection after volatilization as heating furnace
Spectrometer detects the changes of contents of organic matter in burner hearth, when the content of organic matter no longer changes, illustrates EVA adhesive film and organic back of the body
Plate volatilization is complete；Then glass is removed from silicon solar cell component, obtains the silicon solar cell group of organic matter and glass
Part；Then the silicon solar cell component is immersed in the mixed solution of sulfuric acid and copper sulphate and is ultrasonically treated, is ultrasonically treated
After carry out that the first filtrate and the first filter residue is obtained by filtration, wherein the first filter residue includes copper wire, lead sulfate and cell piece；To
It is filtered after hydrogen peroxide and basic copper carbonate is added in one filtrate, obtains stannic acid precipitation and the second filtrate；After stannic acid precipitation calcining
Obtain SnO2Powder, the second filtrate return after sulfuric acid is added for impregnating the silicon solar cell component for removing organic matter and glass；It will
Copper wire in first filter residue, which takes out, to be cleaned, and remaining first filter residue is leached after being rinsed with water with nitric acid after taking-up copper wire, is soaked
Go out liquid and remove the cell piece of silver, wherein obtaining lead sulfate filter residue after the washing lotion filtering rinsed；Sodium chloride is added into leachate
Or hydrochloric acid, obtain silver nitride precipitation；It will be put into a concentration of 48% after the cell piece cleaning for removing silver again, the hydrogen-oxygen that temperature is 75 DEG C
Change and remove aluminum back electrode in sodium, the removal time is 8min；Then the cell piece deionized water after removal aluminum back electrode is clear
After washing, it is 230 DEG C, in a concentration of 85% phosphoric acid to be put into temperature, and silicon nitride is removed；The cell piece of silicon nitride will finally be removed
It after being cleaned with 80 DEG C of deionized water, is put into a concentration of 15% sodium hydroxide and removes pn-junction, obtaining purity is
99.9999% silicon chip.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every at this
Under the design of invention, using equivalent structure transformation made by present specification, or directly/it is used in other phases indirectly
The technical field of pass is included in the scope of patent protection of the present invention.
Claims (9)
1. a kind of method of disposal of silicon solar cell, which is characterized in that include the following steps：
A, machinery remove the aluminium frame and terminal box for the silicon solar cell that need to be recycled, obtain silicon solar cell component；
Silicon solar cell component progress high-temperature heat treatment is made EVA adhesive film in silicon solar cell component and organic backboard wave by B
Hair；
After C, EVA adhesive film and the volatilization of organic backboard, machinery removes glass, obtains the silicon solar cell component of organic matter and glass
And be immersed in the mixed solution of sulfuric acid and copper sulphate and be ultrasonically treated, it carries out that the first filter is obtained by filtration after supersound process
Liquid and the first filter residue, wherein the first filter residue includes copper wire, lead sulfate and cell piece；
D is filtered after hydrogen peroxide and basic copper carbonate is added into the first filtrate, obtains stannic acid precipitation and the second filtrate；
E will obtain SnO after stannic acid precipitation calcining2Powder, the second filtrate be added sulfuric acid after return for impregnate remove organic matter and glass
The silicon solar cell component of glass；
Copper wire in first filter residue is taken out and is cleaned by F, and remaining first filter residue is soaked after being rinsed with water with nitric acid after taking-up copper wire
Go out, obtain leachate and remove the cell piece of silver, wherein obtaining lead sulfate filter residue after the washing lotion filtering rinsed；
Sodium chloride or hydrochloric acid are added into leachate, obtains silver nitride precipitation by G；
H is clear after the cell piece of silver will be gone to be sequentially placed into the aluminum back electrode for removing cell piece in potassium hydroxide or sodium hydroxide solution
It washes, be put into phosphoric acid and cleaned after the silicon nitride of removal cell piece, and be put into potassium hydroxide or sodium hydroxide solution and remove electricity
It is cleaned after the emitter of pond piece, obtains silicon chip.
2. the method for disposal of silicon solar cell as described in claim 1, which is characterized in that the step B includes：
Silicon solar cell component is put into nitrogen or argon gas atmosphere, 450-550 DEG C is risen to the heating rate of 1-30 DEG C/min,
Make the EVA adhesive film in silicon solar cell component and the volatilization of organic backboard.
3. the recovery method of silicon solar cell as claimed in claim 2, which is characterized in that further include after the step B：
The organic volatile obtained after volatilization is collected for for heating furnace heat supply.
4. the method for disposal of silicon solar cell as described in claim 1, which is characterized in that the temperature of phosphoric acid in the step H
It is 150-250 DEG C, a concentration of 80%-95%.
5. the method for disposal of silicon solar cell as claimed in claim 4, which is characterized in that specifically used 50- in the step H
90 DEG C of deionized water cleans the cell piece after removing silicon nitride.
6. the method for disposal of silicon solar cell as described in claim 1, which is characterized in that remove cell piece in the step H
Aluminum back electrode when, a concentration of 40%-50% of used potassium hydroxide or sodium hydroxide, temperature is 70-90 DEG C, when removal
Between be 5-15min.
7. the method for disposal of silicon solar cell as described in claim 1, which is characterized in that remove cell piece in the step H
Emitter when, a concentration of 0.01%-20% of used potassium hydroxide or sodium hydroxide.
8. the method for disposal of silicon solar cell as claimed in claim 7, which is characterized in that remove cell piece in the step H
Emitter when, a concentration of the 0.05% of used potassium hydroxide or sodium hydroxide.
9. the method for disposal of silicon solar cell as described in claim 1, which is characterized in that further include after the step G with
Lower step：
It is leached with ammonia after silver nitride precipitation is cleaned, is used in combination hydrazine hydrate reduction at silver powder.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109360942A (en) * | 2018-11-22 | 2019-02-19 | 中南大学 | A method of negative electrode of lithium ion battery is prepared based on recycling solar cell |
| CN111719043A (en) * | 2020-06-09 | 2020-09-29 | 山西潞安太阳能科技有限责任公司 | Method for recycling waste solar cell |
| CN114522965A (en) * | 2022-03-12 | 2022-05-24 | 湖北智烨新能科技有限公司 | Green and environment-friendly recycling method for new energy material |
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