CN115026108A - Photovoltaic module recycling method - Google Patents
Photovoltaic module recycling method Download PDFInfo
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- CN115026108A CN115026108A CN202210335433.7A CN202210335433A CN115026108A CN 115026108 A CN115026108 A CN 115026108A CN 202210335433 A CN202210335433 A CN 202210335433A CN 115026108 A CN115026108 A CN 115026108A
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- 238000000034 method Methods 0.000 title claims abstract description 66
- 238000004064 recycling Methods 0.000 title claims description 18
- 238000000926 separation method Methods 0.000 claims abstract description 63
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 61
- 239000010703 silicon Substances 0.000 claims abstract description 61
- 239000011521 glass Substances 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 38
- 238000004227 thermal cracking Methods 0.000 claims abstract description 38
- 238000009826 distribution Methods 0.000 claims abstract description 21
- 239000012454 non-polar solvent Substances 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000005520 cutting process Methods 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
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- 230000001070 adhesive effect Effects 0.000 claims description 10
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 9
- 229910052731 fluorine Inorganic materials 0.000 claims description 9
- 239000011737 fluorine Substances 0.000 claims description 9
- 150000002736 metal compounds Chemical class 0.000 claims description 9
- 238000010306 acid treatment Methods 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 3
- 230000002378 acidificating effect Effects 0.000 claims 1
- 230000006378 damage Effects 0.000 abstract description 8
- 239000003960 organic solvent Substances 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- CRSBERNSMYQZNG-UHFFFAOYSA-N 1 -dodecene Natural products CCCCCCCCCCC=C CRSBERNSMYQZNG-UHFFFAOYSA-N 0.000 description 8
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 8
- 239000002253 acid Substances 0.000 description 8
- 229940069096 dodecene Drugs 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- AFFLGGQVNFXPEV-UHFFFAOYSA-N n-decene Natural products CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 8
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 6
- 150000001336 alkenes Chemical class 0.000 description 6
- 238000010248 power generation Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- YHHHHJCAVQSFMJ-UHFFFAOYSA-N deca-1,3-diene Chemical compound CCCCCCC=CC=C YHHHHJCAVQSFMJ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 239000000446 fuel Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a photovoltaic module recovery method, which comprises the following steps: preparing primary distribution materials of a photovoltaic module, carrying out steam treatment on the primary distribution materials to separate out glass, then carrying out steam treatment on the first separation component to separate out a battery silicon wafer, and finally carrying out thermal cracking treatment on the second separation component, wherein the separated glass and the battery silicon wafer are respectively cleaned by a small amount of nonpolar solvent; the invention can greatly improve the use benefit of the high-temperature thermal cracking method, reduce the damage of the glass and the battery silicon chip and improve the value of the recycled glass and the battery silicon chip; the invention can effectively reduce the usage amount of the organic solvent and greatly reduce the waste brought in the treatment process.
Description
Technical Field
The invention relates to a method for recycling solid waste, in particular to a method for recycling a photovoltaic module.
Background
In the past decades, the solar photovoltaic power generation industry has rapidly developed around the world and is now an important green energy industry. The solar photovoltaic module cannot cause pollution in the power generation process, but if the damaged or retired photovoltaic module is not properly recycled, serious heavy metal and waste pollution can be caused to the environment subsequently.
Therefore, how to develop a feasible and economic photovoltaic module disassembling and recycling method is a very important part in the development of the photovoltaic industry at present. The photovoltaic component comprises glass, a battery silicon chip, a cementing layer, a back plate, an inverter, an aluminum material, a copper wire, a small amount of precious metals and the like, wherein the inverter, the aluminum material and the copper wire have mature recovery mechanisms at present, but the glass, the battery silicon chip, the cementing layer, the back plate, the small amount of precious metals and the like in the glass component cannot have economic benefits at present, and a new technology needs to be further developed.
The recovery methods commonly used in the industry currently include thermal cracking treatment and chemical solvent treatment. The thermal cracking treatment method is to directly carry out high-temperature thermal cracking treatment on the photovoltaic glass assembly, burn out the cementing layer and the back plate in the glass assembly, and then treat the rest glass, the battery silicon wafer and the metal compound powder, however, the treatment by the method can pollute the purity of the glass and damage the battery silicon wafer module.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a photovoltaic module recovery method which can sequentially separate all components in a photovoltaic module, reduce the damage of glass and battery silicon chips and is more environment-friendly.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a photovoltaic module recycling method, comprising the steps of:
1) the photovoltaic module preliminary distribution material comprises glass, a first cementing layer, a battery silicon wafer, a second cementing layer and a back plate which are sequentially stacked, and a metal wire is arranged in the second cementing layer or between the battery silicon wafer and the second cementing layer.
2) Placing the primary distribution material in a high-pressure kettle, and treating the primary distribution material by using water vapor at a first temperature to reduce the adhesive force between the glass and the first cementing layer in the primary distribution material, wherein the first temperature is higher than 100 ℃; and then taking out the primary materials, and cutting the first cementing layer to obtain separated glass and a first separation assembly, wherein the first separation assembly comprises a battery silicon wafer, a metal wire, a second cementing layer and a back plate.
3) Cutting the second cementing layer to expose the edge of the battery silicon chip, and then placing the first separation assembly in a high-pressure kettle to be treated by water vapor at a second temperature, so as to reduce the adhesive force between the battery silicon chip and the second cementing layer, wherein the second temperature is higher than 100 ℃; and then taking out the first separation assembly, and separating the battery silicon wafer from the second cementing layer to obtain a separated battery silicon wafer and a separated second separation assembly, wherein the second separation assembly comprises a metal lead, a second cementing layer and a back plate.
4) And the second separation component is treated by a thermal cracking method.
In the step 2, the primary material is placed in an autoclave and treated by water vapor at the temperature of 120 ℃ and 180 ℃ for 36-48 h.
In the step 2, the separated glass is cleaned by a non-polar solvent.
In the step 2, the first cementing layer is cut by a steel wire cutter.
In the step 3, the first separation assembly is placed in an autoclave and treated with steam at 130-150 ℃ for 36-48 h.
And in the step 3, cleaning the separated battery silicon wafer by using a nonpolar solvent.
In the step 2 and the step 3, the treatment with the water vapor is carried out in a water vapor environment for a period of time.
In the step 4, the combustible gas generated in the thermal cracking method treatment process of the second separation assembly is recycled.
In the step 4, the fluorine-containing acid gas in the combustible gas generated in the thermal cracking method treatment process of the second separation assembly is neutralized by the alkaline aqueous solution.
In step 4, the metal compounds contained in the residual solids after the thermal cracking process of the second separation assembly are purified by acid treatment.
The beneficial effects of the invention are:
1. the invention can orderly separate the glass, the battery silicon chip and the metal compound, and simultaneously the cementing layer and the back plate are processed by adopting a high-temperature thermal cracking method, the generated combustible gas can be used by itself or used for power generation, and the economic effect of photovoltaic panel recovery can be effectively improved;
2. the invention can greatly improve the use benefit of the high-temperature thermal cracking method, reduce the damage of the glass and the battery silicon chip and improve the value of the recycled glass and the battery silicon chip;
3. the invention can effectively reduce the use amount of the organic solvent and greatly reduce the waste brought in the treatment process.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of the steps of the present invention.
Detailed Description
Example 1:
a photovoltaic module recycling method, comprising the steps of:
1) demolish frame and terminal box on the photovoltaic module, prepare photovoltaic module's the first material that divides, the first material that divides contains glass, first cementing layer, battery silicon chip, second cementing layer and the backplate that stacks gradually, has wire in the second cementing layer or between battery silicon chip and the second cementing layer.
2) Placing the primary distribution material in a high-pressure kettle, and treating the primary distribution material by using water vapor at a first temperature to reduce the adhesive force between the glass and the first cementing layer in the primary distribution material, wherein the first temperature is higher than 100 ℃; and then taking out the primary materials, and cutting the first cementing layer to obtain separated glass and a first separation assembly, wherein the first separation assembly comprises a battery silicon wafer, a metal wire, a second cementing layer and a back plate.
3) Cutting the second cementing layer to expose the edge of the battery silicon chip, and then placing the first separation assembly in a high-pressure kettle to be treated by water vapor at a second temperature, so as to reduce the adhesive force between the battery silicon chip and the second cementing layer, wherein the second temperature is higher than 100 ℃; and then taking out the first separation assembly, and separating the battery silicon wafer from the second cementing layer to obtain a separated battery silicon wafer and a separated second separation assembly, wherein the second separation assembly comprises a metal wire, a second cementing layer and a back plate.
4) And treating the second separation component by a thermal cracking method.
The embodiment has the following beneficial effects:
1. the embodiment can orderly separate the glass, the battery silicon chip and the metal compound, and simultaneously the cementing layer and the back plate are treated by adopting a high-temperature thermal cracking method, so that the generated combustible gas can be used by itself or used for power generation, and the economic effect of photovoltaic panel recovery can be effectively improved;
2. the embodiment can greatly improve the use benefit of the high-temperature thermal cracking method, simultaneously reduce the damage of the glass and the battery silicon chip and improve the value of the recycled glass and the battery silicon chip;
3. the embodiment can effectively reduce the use amount of the organic solvent and greatly reduce the waste brought in the treatment process.
In the step 2, the primary ingredient is treated in an autoclave by steam treatment at 130 ℃ for 48 hours, specifically, the primary ingredient is treated in an autoclave by providing a high temperature and high pressure steam environment at 130 ℃ for 48 hours. The glass is separated by adopting steam treatment, so that the damage to the glass caused by high-temperature thermal cracking treatment in the later period is avoided.
In the step 2, the separated glass is cleaned by a small amount of nonpolar solvent, the nonpolar solvent may be one of liquid alkene octene, decene and dodecene, in this embodiment, liquid alkene octene is preferred, in the conventional method, the whole primary material is soaked by the nonpolar solvent, and after the cementing layer on the glass is dissolved by the organic solvent, the glass is separated.
And in the step 2, cutting the first cementing layer by a steel wire cutter.
In the step 3, the first separation module is treated in an autoclave for 48 hours by treating the first separation module with 130 ℃ steam, specifically, the first separation module is treated in an autoclave for 48 hours by providing a high temperature and high pressure steam environment at 130 ℃. And the battery silicon wafer is separated by adopting steam treatment, so that the battery silicon wafer is prevented from being damaged by high-temperature thermal cracking treatment in the later stage.
In the step 3, the separated battery silicon wafer is cleaned by using a small amount of nonpolar solvent, the nonpolar solvent may be one of liquid vinyl octene, decene, and dodecene, in this embodiment, liquid vinyl octene is preferred, in the conventional method, the whole first separation assembly is soaked by using the nonpolar solvent, and after the organic solvent dissolves the glue layer on the battery silicon wafer, the battery silicon wafer is separated.
In the step 2 and the step 3, the treatment with the water vapor is carried out in a water vapor environment for a period of time.
In the step 4, the high-temperature thermal cracking method comprises the steps of placing the second separation assembly in a pyrolysis reactor for decomposition, wherein the reaction temperature is 600 ℃, the reaction time is determined according to the amount of the processed substances, the glue layer and the back plate can be decomposed, and compared with the traditional method of directly carrying out thermal treatment on the whole primary separation material, the method firstly separates the glass and the battery silicon wafer, and then carries out high-temperature thermal cracking on the rest assemblies, so that the thermal cracking efficiency can be effectively improved, the damage of the glass and the battery silicon wafer in the thermal cracking process can be reduced, and the value of the recycled glass and the battery silicon wafer can be improved.
In the step 4, the combustible gas generated in the thermal cracking process of the second separation module can be recycled, and can be used for power generation by recycling, or can be recycled as fuel of the thermal cracking reactor.
In the step 4, the fluorine-containing acid gas in the combustible gas generated in the thermal cracking method treatment process of the second separation assembly is neutralized by the alkaline aqueous solution. The fluorine-containing acid gas is corrosive, can cause harm to the skin when a human body is contacted with the fluorine-containing acid gas, and can cause an acid rain phenomenon when the fluorine-containing acid gas is discharged into the air, so that the fluorine-containing acid gas generated by pyrolysis treatment needs to be collected and neutralized.
In the step 4, the metal compound contained in the residual solid after the thermal cracking process of the second separation assembly is purified by acid treatment, and the purified metal compound can be reused.
Example 2:
a photovoltaic module recycling method, comprising the steps of:
1) demolish frame and terminal box on the photovoltaic module, prepare photovoltaic module's the first material that divides, the first material that divides contains glass, first cementing layer, battery silicon chip, second cementing layer and the backplate that stacks gradually, has wire in the second cementing layer or between battery silicon chip and the second cementing layer.
2) Placing the primary distribution material in a high-pressure kettle, and treating the primary distribution material by using water vapor at a first temperature to reduce the adhesive force between the glass and the first cementing layer in the primary distribution material, wherein the first temperature is higher than 100 ℃; and then taking out the primary materials, and cutting the first cementing layer to obtain separated glass and a first separation assembly, wherein the first separation assembly comprises a battery silicon wafer, a metal wire, a second cementing layer and a back plate.
3) Cutting the second cementing layer to expose the edge of the battery silicon chip, and then placing the first separation assembly in a high-pressure kettle to be treated by water vapor at a second temperature to reduce the adhesive force between the battery silicon chip and the second cementing layer, wherein the second temperature is higher than 100 ℃; and then taking out the first separation assembly, and separating the battery silicon wafer from the second cementing layer to obtain a separated battery silicon wafer and a separated second separation assembly, wherein the second separation assembly comprises a metal wire, a second cementing layer and a back plate.
4) And treating the second separation component by a thermal cracking method.
In the step 2, the initial material is placed in an autoclave and treated with 160 ℃ steam for 36 h.
In the step 2, the separated glass is cleaned with a small amount of non-polar solvent, which may be one of liquid alkenes octene, decene and dodecene, and in this embodiment, decene is preferred.
And in the step 2, cutting the first cementing layer by a steel wire cutter.
In said step 3, the first separation assembly is placed in an autoclave and treated with steam at 150 ℃ for 36 h.
In the step 3, the separated battery silicon wafer is cleaned by a small amount of non-polar solvent, wherein the non-polar solvent may be one of liquid alkenes, namely octene, decene and dodecene, and in the embodiment, decene is preferred.
In the step 2 and the step 3, the treatment with the water vapor is carried out in a water vapor environment for a period of time.
In the step 4, the high-temperature thermal cracking method comprises the step of placing the second separation assembly in a pyrolysis reactor for decomposition, wherein the reaction temperature is 600 ℃.
In the step 4, the combustible gas generated in the thermal cracking method treatment process of the second separation assembly is recycled.
In the step 4, the fluorine-containing acid gas in the combustible gas generated in the thermal cracking method treatment process of the second separation assembly is neutralized by the alkaline aqueous solution.
In step 4, the metal compounds contained in the residual solids after the thermal cracking process of the second separation assembly are purified by acid treatment.
Example 3:
a photovoltaic module recycling method, comprising the steps of:
1) demolish frame and terminal box on the photovoltaic module, prepare photovoltaic module's the first material that divides, the first material that divides contains glass, first cementing layer, battery silicon chip, second cementing layer and the backplate that stacks gradually, has wire in the second cementing layer or between battery silicon chip and the second cementing layer.
2) Placing the primary distribution material in a high-pressure kettle, and treating the primary distribution material by using water vapor at a first temperature to reduce the adhesive force between the glass and the first cementing layer in the primary distribution material, wherein the first temperature is higher than 100 ℃; and then taking out the primary materials, and cutting the first cementing layer to obtain separated glass and a first separation assembly, wherein the first separation assembly comprises a battery silicon wafer, a metal wire, a second cementing layer and a back plate.
3) Cutting the second cementing layer to expose the edge of the battery silicon chip, and then placing the first separation assembly in a high-pressure kettle to be treated by water vapor at a second temperature, so as to reduce the adhesive force between the battery silicon chip and the second cementing layer, wherein the second temperature is higher than 100 ℃; and then taking out the first separation assembly, and separating the battery silicon wafer from the second cementing layer to obtain a separated battery silicon wafer and a separated second separation assembly, wherein the second separation assembly comprises a metal wire, a second cementing layer and a back plate.
4) And the second separation component is treated by a thermal cracking method.
In the step 2, the initial material is placed in an autoclave and treated by steam at 140 ℃ for 42 h.
In the step 2, the separated glass is cleaned by a small amount of non-polar solvent, which may be one of liquid alkenes octene, decene and dodecene, and in this embodiment, dodecene is preferred.
In the step 2, the first cementing layer is cut by a steel wire cutter.
In said step 3, the first separation module was placed in an autoclave and treated with steam at 140 ℃ for 42 h.
In the step 3, the separated battery silicon wafer is cleaned by a small amount of non-polar solvent, wherein the non-polar solvent may be one of liquid alkenes, namely octene, decene and dodecene, and in this embodiment, dodecene is preferred.
In the step 2 and the step 3, the treatment with the water vapor is carried out in a water vapor environment for a period of time.
In the step 4, the high-temperature thermal cracking method comprises the step of placing the second separation assembly in a pyrolysis reactor for decomposition, wherein the reaction temperature is 600 ℃.
In the step 4, the combustible gas generated in the thermal cracking method treatment process of the second separation assembly is recycled.
In the step 4, the fluorine-containing acid gas in the combustible gas generated in the thermal cracking method treatment process of the second separation assembly is neutralized by the alkaline aqueous solution.
In step 4, the metal compounds contained in the residual solids after the thermal cracking process of the second separation assembly are purified by acid treatment.
The above embodiments do not limit the scope of the present invention, and those skilled in the art can make modifications and variations without departing from the overall spirit of the present invention.
Claims (10)
1. A photovoltaic module recycling method is characterized by comprising the following steps:
1) preparing primary distribution material of the photovoltaic module, wherein the primary distribution material comprises glass, a first cementing layer, a battery silicon chip, a second cementing layer and a back plate which are sequentially stacked, and a metal wire is arranged in the second cementing layer or between the battery silicon chip and the second cementing layer;
2) placing the primary distribution material in a high-pressure kettle, and treating the primary distribution material by using water vapor at a first temperature to reduce the adhesive force between the glass and the first cementing layer in the primary distribution material, wherein the first temperature is higher than 100 ℃; then taking out the primary split materials, and cutting the first cementing layer to obtain separated glass and a first separation assembly, wherein the first separation assembly comprises a battery silicon chip, a metal lead, a second cementing layer and a back plate;
3) cutting the second cementing layer to expose the edge of the battery silicon chip, and then placing the first separation assembly in a high-pressure kettle to be treated by water vapor at a second temperature to reduce the adhesive force between the battery silicon chip and the second cementing layer, wherein the second temperature is higher than 100 ℃; then taking out the first separation assembly, and separating the battery silicon wafer from the second cementing layer to obtain a separated battery silicon wafer and a second separation assembly, wherein the second separation assembly comprises a metal lead, a second cementing layer and a back plate;
4) and treating the second separation component by a thermal cracking method.
2. The photovoltaic module recycling method according to claim 1, wherein in the step 2, the primary distribution is treated in an autoclave with water vapor at 120-.
3. The photovoltaic module recycling method according to claim 1, wherein in the step 2, the separated glass is cleaned with a non-polar solvent.
4. The photovoltaic module recycling method according to claim 1, wherein in the step 2, the first glue layer is cut with a wire cutter.
5. The method as claimed in any one of claims 1 to 4, wherein in the step 3, the first separated module is placed in an autoclave and treated with water vapor at 130-150 ℃ for 36-48 h.
6. The photovoltaic module recycling method according to any one of claims 1 to 4, wherein in the step 3, the separated battery silicon wafer is cleaned with a non-polar solvent.
7. The photovoltaic module recycling method according to any one of claims 1 to 4, wherein in the steps 2 and 3, the treatment with water vapor is performed in a water vapor atmosphere for a period of time.
8. The photovoltaic module recycling method according to any one of claims 1 to 4, wherein in the step 4, the combustible gas generated during the thermal cracking process of the second separation module is recycled.
9. The photovoltaic module recycling method according to any one of claims 1 to 4, wherein in the step 4, the fluorine-containing acidic gas in the combustible gas generated in the thermal cracking process of the second separation module is neutralized by an alkaline aqueous solution.
10. The photovoltaic module recovery method according to any of claims 1 to 4, wherein in step 4, the metal compounds contained in the residual solids after the thermal cracking process of the second separation module are purified by acid treatment.
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