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US 4,900,532 AGranted
Continuous process for refining silicon
AssigneeBayer Aktiengesellschaft
InventorsGunter Kurz, Ingo Schwirtlich, Klaus Gebauer
Life of this patent
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Abstract
An improved process for purifying and refining silicon containing impurities comprises: (i) continuously melting impure silicon to form a thin film silicon melt, preferably on an inclined surface of a silicon-resistant material, (ii) continuously treating the thin film silicon melt with a reactive gas with or without an inert gas, (iii) optionally degassing the treated silicon melt, and thereafter (iv) continuously crystallizing the treated silicon.
Claims11
In a continuous process for purifying and refining silicon containing impurities,
- the improvement comprises continuosuly melting silicon to form a film of silicon melt, continuously treating the silicon melt film with reactive gas comprising steam, silicon tetrahalide, halogen silane, hydrogen chloride, mixtures thereof, or mixtures thereof with hydrogen, then continuously crystallizing the treated silicon melt.
Dependencies are inferred from the claim text.