Purification of metallurgical grade silicon
AssigneeUniversite de Sherbrooke
InventorMaher I. Boulos
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Abstract
There is disclosed a process for preparing ultra pure silicon from metallurgical grade silicon, which comprises (a) continuously passing powdered and acid-leached metallurgical grade silicon through an induction plasma; (b) quenching said treated particles whereby upon solidification of the molten particles, a portion of the impurities therein migrates to the surface of the granules obtained; (c) acid-leaching the surface impurities of the granules obtained in step (b); and (d) after drying the granules obtained, repeating steps (a), (b) and (c) until a silicon of the desired purity is obtained.
Claims5
Process for preparing ultra pure silicon which comprises:
- (a) continuously passing powdered and acid-leached metallurgical grade silicon through an induction plasma to melt the silicon;
- (b) quenching said molten silicon particles whereby upon solidification of the molten particles, a portion of the impurities therein migrates to the surface of the granules obtained;
- (c) acid-leaching the surface impurities of the granules obtained in step (b);
- and
- (d) after drying the granules obtained, repeating steps (a), (b), and (c) until a silicon of the desired purity is obtained.
Dependencies are inferred from the claim text.