Wacker Chemie Ag

Gerhard Traunspurger

Reiner Pech

Laszlo Fabry

Uwe Paetzold

Karl-Heinz Rimboeck

Uwe Pätzold

Karl-Heinz Rimböck

Bernhard Pflügler

Walter Grünleitner

Metallurgical silicon containing impurities of carbon and/or carbon-containing compounds is classified and subsequently used selectively for chlorosilane production. The process comprises the steps of: As a result of the process, metallurgical silicon having a total carbon content of up to 2500 ppmw can be used for producing chlorosilanes.

Method of classifying metallurgical silicon

The invention provides chunk polycrystalline silicon having a concentration of carbon at the surface of 0.5-35 ppbw. A process for cleaning polycrystalline silicon chunks having carbon contaminations at the surface, includes a thermal treatment of the polycrystalline silicon chunks in a reactor at a temperature of 350 to 600&#xb0; C., the polycrystalline silicon chunks being present in an inert gas atmosphere during the thermal treatment, and the polycrystalline silicon chunks after the thermal treatment having a concentration of carbon at the surface of 0.5-35 ppbw.

Chunk polycrystalline silicon and process for cleaning polycrystalline silicon chunks

A process for preparing trichloromonosilane, in which silicon particles are reacted with hydrogen chloride in a fluidized bed reactor, wherein the silicon particles used are a silicon dust which is obtained as a waste product in the preparation of defined silicon particle size fractions from lump-form silicon and the silicon dust is introduced directly into the reactor.

Process for preparing trichloromonosilane

Growing community of inventors

Berchtesgaden, Germany

Gerhard Traunspurger