Wacker Chemie Ag

Michael Fricke

Eckhard Hanelt

Gerhard Forstpointner

Rainer Hauswirth

Jan Tillmann

Bernhard Baumann

Martin Brixel

Robert Enggruber

Sebastian Kneissl

Alena Kalyakina

Christoph Dräger

The invention relates to methods for producing silicon particles by grinding silicon-containing solids, wherein one or more gases are used, which contain reactive gas at a partial pressure of &#x2265;0.3 bar, wherein reactive gases are selected from the group comprising oxygen, ozone, inorganic peroxides, carbon monoxide, carbon dioxide, ammonia, nitrogen oxides, hydrogen cyanide, hydrogen sulfide, sulfur dioxide, and volatile organic compounds.

Method for grinding silicon-containing solids

The object of the invention are methods for the production of silicon particles by grinding silicon-containing solids in a jet mill using a grinding fluid containing water vapor.

Plastic material-comprising surfaces of a substrate are coated with elemental silicon by cold gas spraying by injecting a powder containing silicon into a gas and powder with a high velocity onto the substrate surface, such that the silicon forms a firmly adherent coat on the substrate surface comprising the plastics material. Apparatuses having such silicon-coated surfaces are useful in minimizing contamination of polycrystalline silicon production, processing, packaging, and transport.

Plastics material substrate having a silicon coating

Granular polysilicon is fed into a screening plant, divided into two or more fractions by means of one or more screen surfaces, and thereby classified and dedusted wherein a throwing motion of the granular polysilicon in the screening plant removes adhering dust particles from the granular polysilicon, the removed dust particles are taken off from the screening plant by means of a gas flow supplied to the screening plant, and the screening plant is of gas-tight design and supply and takeoff of the gas flow are effected such that the screening plant is at a positive pressure compared to the surroundings.

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Burghausen, Germany

Michael Fricke