Process for the production of refined metallurgical silicon

Details Process for the production of refined metallurgical silicon Process for the production of refined metallurgical silicon

1977-11-21

1980-03-25

Cooper, Jack

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

23295R, 23296, 156616R, 156DIG64, C01B 3302

Patent

active

041950674

ABSTRACT:
Silicon platelets essentially free of iron are precipitated from a solution of metallurgical grade silicon in molten aluminum and are melted in contact with silica slag to produce a refined metallurgical silicon (RMS). By directionally solidifying the refined silicon-slag melt, a directionally solidified refined metallurgical silicon (DS/RMS) is separated from a region of solidified melt having a high concentration of impurities rejected by the silicon as it solidifies. The resulting RMS and DS/RMS materials are low-cost, multigrained products having a substantially higher impurity content than in conventional high purity semiconductor grade silicon while, at the same time, have suitable properties for desirable solar cell and other silicon applications.

REFERENCES:
patent: 1180968 (1916-04-01), Brockbank
patent: 2749216 (1956-06-01), Dinwiddie et al.
patent: 3012865 (1961-12-01), Pellin
patent: 3097068 (1963-07-01), Litz et al.
patent: 3871872 (1975-03-01), Downing et al.

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