Abstract: With the large-scale decommissioning of photovoltaic modules in China, photovoltaic glass accounts for the largest part of module mass (≥70%), and its high-value and green recycling have become the key issue to be solved urgently for the sustainable development of new energy industry. This study innovatively proposed the remelting waste photovoltaic glass to produce ultra-clear glass and explored the regulatory mechanism of the Redox of batch materials on the optical properties of the recycled ultra-clear glass. The results indicate that enhancing the oxidative nature of batch materials can effectively improve the optical performance of the glass. When using NaNO₃, CeO₂+NaNO₃, and Na₂SO₄+carbon powder (C) to adjust the Redox of batch materials, the visible light transmittance of the glass increase from 91.00%, 90.61% and 87.89% to 91.33%, 91.46% and 91.57%, respectively, and the yellow-green hue of the glass is reduced. In particular, the Na₂SO₄+C has the most significant effect on improving the visible light transmittance and reducing the yellow-green hue. This study provides a theoretical basis and process optimization scheme for the closed-loop high-value utilization of decommissioned photovoltaic glass.

Key words: waste photovoltaic glass, ultra-clear glass, Redox of batch material, visible light transmittance, chromaticity