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US 10,118,830 B2Granted
Method for producing granular polysilicon
AssigneeWacker Chemie AG
InventorsRainer Hauswirth, Robert Enggruber
Life of this patent
Estimating the term…
Abstract
Segregation of silicon granules in the fluidized bed production of polycrystalline silicon is achieved by successively transferring granular polycrystalline silicon through a plurality of vessels designed for funnel flow of granular material. The transfers may occur prior to introduction of feed particles into the reactor, or the enlarged granules from the reactor may be thus transferred to improve product size uniformity.
Claims3
A process for avoiding particle segregation by size in the handling of granular polysilicon after production of the granular polysilicon by a process comprising:
- fluidizing silicon particles by means of a gas flow in a fluidized bed which is heated to a temperature of 850-1100° C. by means of a heating apparatus, adding a silicon-containing reaction gas and depositing silicon on the silicon particles, and withdrawing granular polysilicon from the fluidized bed reactor, and before packing the granular polysilicon, transferring the granular polysilicon by means of a plurality of successive conical vessels designed for funnel flow, and wherein at least one of the plurality of vessels comprises filling distributor cones consisting of silicon of coated or lined with silicon, installed in at least one of the plurality of vessels.
Dependencies are inferred from the claim text.