Device and method for comminuting coarsely crushed polycrystalline silicon

US7950600B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Peter Gruebl · Triftern, DE
• Rainer Hoelzlwimmer · Vilshofen an der Donau, DE

Key dates

• Filing date: Mar 14, 2007
• Grant date: May 31, 2011
• Expiry date: Aug 29, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C01B33/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Polysilicon is crushed with a minimum of manual and machine crushing steps by utilizing a large diameter roll crusher, the circumferential crushing surface of which is formed of a plurality of reversibly mounted, close fitting hard metal plates. Reproducible crushing along with such low metal contamination that subsequent cleaning of the crushed polysilicon is not necessary are both obtained.