Calcium-silicate based slag for treatment of molten silicon

Details Calcium-silicate based slag for treatment of molten silicon Calcium-silicate based slag for treatment of molten silicon

2009-07-13

2010-12-21

Wyszomierski, George (Department: 1793)

Specialized metallurgical processes, compositions for use therei

Compositions

Solid treating composition for liquid metal or charge

C075S392000

Reexamination Certificate

active

07854784

ABSTRACT:
A method for making solar grade silicon from metallurgical grade silicon is accomplished by treating a calcium silicate based slag with ferrosilicon in the first vessel so as to obtain a purification of the calcium silicate based slag. In a second vessel, the purified calcium based silicate slag is used to treat metallurgical grade silicon in order to obtain a solar grade silicon. The purification of calcium silicate based slag in the first vessel is accomplished to reduce phosphorous to a level of less than 3 ppmw.

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