FIELD: chemistry.
SUBSTANCE: method includes separation of silicium tetrafluoride by fluorination of natural silicium oxides - silica sand or quartzite - with reversible elementary fluorine, electrolytic reduction of melted eutectic of fluoride salts of alkaline metals and washing of electrolyte salts and impurities with ammonium hydrofluoride.
EFFECT: invention allows obtaining semiconducting polycrystalline silicium with reduced expenses.
4 cl
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