| Title | Recycling of discarded photovoltaic solar modules for metal recovery |
|---|---|
| ID_Doc | 9427 |
| Authors | Dhawan, N; Agrawal, S |
| Title | Recycling of discarded photovoltaic solar modules for metal recovery |
| Year | 2022 |
| Published | Mining Metallurgy & Exploration, 39.0, 6 |
| Abstract | India's most extensive renewable energy expansion program targets 280 GW of solar energy by 2030. Due to the massive generation of photovoltaic waste (expected 34,600 T by 2030), stringent recycling effort to recover metal resources from end-of-life PVs is required for resource recovery, circular economy, and subsequent reduction in the environmental impact. The present study investigates the recycling potential of end-of-life silicon solar modules. The feed characterization reveals that most of the values in PV modules are concentrated in the frame (pure Al), Si wafer (72-84% Si, 9-12% Al, and 0.13-0.71% Ag), and electrical connections (Cu wire coated with Sn). The Si and Ag values in the feed were beneficiated using water fluidization, and concentrate with 90% Si and 2% Ag was attained in the underflow concentrate. Ag values were recovered in the form of AgCl by leaching in nitric acid and precipitation. After the purification step, the residue containing 99% Si can be further utilized to fabricate Si wafer and Al-Si alloy. The preliminary cost estimations suggest that the proposed process is economically viable for the recycling of solar panels with the maximum value generated from the AgCl precipitate followed by Al panels and Si wafers. |
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