Method of preparing silicon from sodium fluosilicate

Method of preparing silicon from sodium fluosilicate

A process for preparing high purity silicon metal from Na2SiF6 (sodium fluosilicate). The sodium fluosilicate is heated to decomposition temperature to form NaF, which retains most of the impurities, and gaseous SiF4. The SiF4 is then reduced by the bomb reduction method using a reductant having a l...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SCHMIDT, FREDERICK A, REHBEIN, DAVID, CHIOTTI, PREMO
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Zusammenfassung:A process for preparing high purity silicon metal from Na2SiF6 (sodium fluosilicate). The sodium fluosilicate is heated to decomposition temperature to form NaF, which retains most of the impurities, and gaseous SiF4. The SiF4 is then reduced by the bomb reduction method using a reductant having a low packing density.