Process and apparatus for refining silicon

Details Process and apparatus for refining silicon Process and apparatus for refining silicon

C - Chemistry, Metallurgy

01

B

C01B 33/037 (2006.01)

Patent

CA 2200166

Process and apparatus for refining silicon by treatment in a graphite vessel with irradiation with an electron beam while removing impurity elements by evaporation. A single graphite vessel is used, or plural graphite vessels are arranged in sequence. During treatment in successive graphite vessels, molten silicon is poured in succession from one vessel to another. Use of graphite vessels improves heat efficiency, prevents contamination and produces refined silicon containing very low contents of impurities.

Procédé et appareil pour raffiner le silicium en l'irradiant à l'intérieur d'un contenant en graphite par un faisceau d'électrons, tout en éliminant les impuretés par évaporation. On peut utiliser un seul contenant de graphite ou plusieurs contenants disposés en série. Pendant le traitement dans les contenants successifs, le silicium fondu est versé d'un contenant à l'autre. L'emploi de contenants de graphite améliore le rendement thermique, prévient la contamination et permet d'obtenir du silicium raffiné contenant de très faibles teneurs en impuretés.

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