Patent · US Expired

Method for producing highly purified, granular silicium

US7001579B2 · kind B2 · utility

38Cited by

4References

21Claims

0Family size

Assignee

SOLARWORLD AG · DE

Inventors

Karl-Ludwig Metzger · Bensberg, DE
Leslaw Mleczko · Bochum, DE
Sigurd Buchholz
Philipp Schlichthärle · Odenthal, DE

Key dates

Filing date	Nov 21, 2001
Grant date	Feb 21, 2006
Priority date	—
Expiry date	Jul 1, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B33/029
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

The invention relates to a method for producing granular silicon by thermal decomposition of a gas containing silicon in a fluidized bed, said decomposition occurring in the presence of free-flowing mobile elements. Preferably, said free-flowing mobile elements become devoid of silicon in a separate procedural step, said silicon being deposited during decomposition of gas containing silicon, by reacting with hydrogen halides, halogens, alkyl halogenides, aryl halogenides or combinations of halogen and/or hydrogen halide and/or oxidized mineral acids and/or by thermal treatment of said elements.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.