Process for removing impurities from residual silicon powder
AssigneeGeneral Electric Company
InventorsBakulesh N. Shah, Alan Ritzer
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Abstract
A process for recovering and recycling elementary silicon from a direct process organohalosilane reactor system is provided, comprising the steps of analyzing a portion of effluent contact mass, such as the silicon fines from a secondary cyclone with a particle size distribution analyzer, determing the fines fractions containing the relatively greatest amounts of impurities and segregating a relatively impure fine fraction from a purer coarse fraction with the aid of an aerodynamic centrifugal classifier.
Claims10
A process for purifying silicon metal contact mass from a direct process organohalosilane reactor system comprising the steps of:
- (a) analyzing a portion of reactor contact mass for particle size distribution;
- (b) classifying said analyzed contact mass into a relatively pure first fraction and a relatively impure second fraction;
- and
- (c) segregating said first and second fractions.
Dependencies are inferred from the claim text.