Process for the production of medium and high purity silicon...

Details Process for the production of medium and high purity silicon... Process for the production of medium and high purity silicon...

2008-03-13

2010-06-01

Vanoy, Timothy C (Department: 1793)

Chemistry of inorganic compounds

Silicon or compound thereof

Elemental silicon

Reexamination Certificate

active

07727502

ABSTRACT:
A process for purifying low-purity metallurgical grade silicon, contains at least one contaminant and obtains a higher-purity solid polycrystalline silicon. The process includes containing a melt of low-purity metallurgical grade silicon in a mold having insulated bottom and side walls, and an open top; solidifying the melt by unidirectional solidification from the open top towards the bottom wall while electromagnetically stirring the melt; controlling a rate of the unidirectional solidification; stopping the unidirectional solidification when the melt has partially solidified to produce an ingot having an exterior shell including the higher-purity solid polycrystalline silicon and a center including an impurity-enriched liquid silicon; and creating an opening in the exterior shell of the ingot to outflow the impurity-enriched liquid silicon and leave the exterior shell which has the higher-purity solid polycrystalline silicon.

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