Waste photovoltaic panel pyrolysis nondestructive recovery system and method

Through the combined method of low-temperature pyrolysis and chemical treatment, the problem of silicon wafer damage during photovoltaic panel pyrolysis was solved, and lossless recycling of silicon wafers was achieved, which reduced production costs and improved material purity, making it suitable for industrial applications.

CN120679816APending Publication Date: 2025-09-23XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD
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Patent Information

Application Number
CN202510845316.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-23
Publication Date
2025-09-23

AI Technical Summary

Technical Problem

Existing photovoltaic panel pyrolysis technology requires breaking silicon wafers when recycling them, which causes damage to the silicon wafers and increases reproduction costs.

Method used

A method combining low-temperature pyrolysis with chemical treatment is used. The aluminum frame and back panel are removed through the pretreatment unit, the EVA film is softened in a low-temperature pyrolysis furnace, and the glass sheet and battery sheet are separated by a cutting machine. The aluminum back electrode is then dissolved in the acid-base treatment module, and finally the silver electrode is electrolytically recovered in the electrochemical recovery module to achieve lossless recycling of silicon wafers.

Benefits of technology

It realizes lossless recycling of silicon wafers, reduces the production cost of photovoltaic panels, improves material purity and recycling efficiency, and is suitable for industrial production.

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Abstract

The invention provides a waste photovoltaic panel pyrolysis nondestructive recovery system and method, and relates to the technical field of photovoltaic panel pyrolysis, the system comprises a pretreatment unit, a mechanical treatment unit and a chemical treatment unit, the pretreatment unit is used for dismounting an aluminum frame, a junction box and a back plate on a waste photovoltaic panel; the mechanical treatment unit comprises a low-temperature pyrolyzing furnace and a cutting machine which are connected with each other, the low-temperature pyrolyzing furnace is connected with the pretreatment unit and is used for softening an EVA adhesive film on the waste photovoltaic panel, and the cutting machine is used for cutting the softened EVA adhesive film so as to separate a glass sheet from a battery piece; the chemical treatment unit comprises an acid-base treatment module and an electrochemical recovery module which are connected, the acid-base treatment module is connected with the cutting machine and used for recovering aluminum back electrodes on the battery pieces, and the electrochemical recovery module is used for electrolyzing and recovering silver electrodes on the battery pieces to obtain silicon wafers. According to the invention, nondestructive recovery of the silicon wafer can be realized, the recovered silicon wafer can be directly reused for photovoltaic panel production, and the production cost of the photovoltaic panel is reduced.
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