Wacker Chemie Ag

Bernhard Baumann

Gerhard Forstpointner

Norbert Ellinger

Michael Fricke

Simon Pedron

Nobert Ellinger

A subject of the invention is a fluidized-bed reactor for producing granular polycrystalline silicon. The fluidized-bed reactor comprises a segmented reactor tube, which is disposed between a reactor top and a reactor bottom, a heating facility, at least one nozzle for supplying fluidizing gas, at least one nozzle for supplying reaction gas, a facility for supplying silicon seed particles, a product removal line, and an offgas removal line. The segmented reactor tube comprises a base segment and at least one spacer segment, there being disposed, between base segment and spacer segment, a flat seal made from a carbon-containing material, the spacer segment consisting of a material which, within a temperature range from 100 to 950&#xb0; C., has a thermal conductivity of &#x3c;2 W/mK.

Fluidized bed reactor for production of granular polycrystalline silicon

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

Control of the flow of granular polysilicon granules is effected by employing an elastomeric pinch sleeve valve. The flow control by this method is especially useful for controlling the flow of silicon seed particles and granular polysilicon product in the fluidized bed method for producing polysilicon. The flow may be stopped without gas leakage, and is suitable for use over long operating campaigns.

Fluidized bed reactor with pinching fittings for producing polysilicon granulate, and method and use for same

Silicon granules are conveyed in an encapsulated conveying channel by swaying movement of the channel produced by a permanent magnet excited by an external alternating electromagnetic field.

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Emmerting, Germany

Bernhard Baumann