Process for refining silicon and silicon purified thereby

US4837376A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ingo Schwirtlich · Miltenberg, DE
• Horst Lange · Bochum, DE
• Werner Kannchen · Duisburg, DE

Key dates

• Filing date: Oct 5, 1987
• Grant date: Jun 6, 1989
• Expiry date: Oct 5, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B33/037
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Highly pure silicon is produced by refining impure silicon to remove deleterious impurities by contacting a melt of the impure silicon with a reacitve gas which comprises a gaseous halogen compound mixed with steam, hydrogen or a stem/hydrogen mixture.