How to remove silicon powder from photovoltaic panels
Pyrolysis is an effective thermal treatment process wherein high heat is applied to the silicon PV panel, leading to the delamination of glass and the EVA layer from silicon-based PV panels.
Pyrolysis is an effective thermal treatment process wherein high heat is applied to the silicon PV panel, leading to the delamination of glass and the EVA layer from silicon-based PV panels.
The proposed technique provides silicon powder that could be reused as a raw material for upcycling into silicon nitride, silicon oxide, or silicon carbide.
Conventional recycling methods to separate pure silicon from photovoltaic cells rely on complete dissolution of metals like silver and aluminium and the recovery of insoluble silicon by employing multiple leaching reagents. A common approach that eschews hydrofluoric acid (HF) treatment is the double reagent approach which utilizes nitric acid .
To overcome this obstacle, we have advanced a way of recuperating silicon from waste PV panels and their efficient utilization in battery technology. A patented technique was used to deconstruct PV panels into various materials stream where the recovered silicon was purified by adopting a KOH-based green chemistry approach.
The results show that alkali/acid leaching can effectively remove the main impurities and obtain high purity silicon (∼99.86%). The resulting PSi/Li/N@C composite exhibits a high capacity of 685.2 mA h g −1 after 100 cycles at 2000 mA g −1 .
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