Contribution à la purification des déchets de silicium solaire oxydé à l'aide d'un procédé assisté par plasma thermique

Abstract : Wafer manufacturing produces large amounts of solar-grade silicon waste that is not currently recovered because of its contamination during the slicing process. This work deals with the purification of silicon waste using a non-transferred arc plasma process. It was carried out by using a double approach combining numerical simulations and experiments. The former were done using a computational fluid dynamics (CFD) code and made it to size the experimental configuration and understand the effect of process parameters on gas flow fields and powder treatment. The experimental study consisted in injecting powdered silicon waste (sawdust silicon, crushed powder) into the plasma jet under controlled atmosphere and collecting the treated material in a hot crucible. Decarburization and deoxidation of silicon waste, including sawdust resulting from wafer slicing, was achieved by the developed method. However, the removal of metal impurities in silicon sawdust was not demonstrated in this study. The experimental and numerical results showed that deoxidation was improved with a low-velocity plasma jet and limited air content in the area of treatment. Silica carboreduction and silica volatilization by silicon oxidation seemed to be the two mechanisms involved in the purification process.
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Matthias de Sousa. Contribution à la purification des déchets de silicium solaire oxydé à l'aide d'un procédé assisté par plasma thermique. Matériaux. Université de Limoges, 2014. Français. ⟨NNT : 2014LIMO0033⟩. ⟨tel-01127382⟩

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