Patent ID: 9039833
Filing Date: 2015-05-26
Classification: C01B,C30B

Abstract:
1. A semi-continuous process for the formation, separation and melting of large and pure silicon crystals of a size of 1-5 mm, wherein a prepurified binary or ternary hypereutectic alloy containing Si melt is transferred to a furnace having a temperature gradient from top to bottom, small and pure silicon crystals of a size of 100-200 μm are then added to the melt in the furnace and grow due to the temperature difference until the melt in the furnace reaches eutectic composition, whereupon the melt is transported from the furnace and brought to the hypereutectic state, is then returned to the furnace and the process is repeated until an amount of large (1-5 mm) Si crystals has been formed.