Patent ID: 8997524
Filing Date: 2015-04-07
Classification: B01J,C01B,C30B

Abstract:
1. A method of manufacturing polysilicon comprising: feeding powdery raw silicon to a silicon melting unit and melting the fed raw silicon by irradiating a first electron beam upon the raw silicon; continuously feeding and melting the raw silicon such that molten silicon is overflowed from the silicon melting unit; receiving, by an unidirectional solidification unit, the molten silicon overflowed from the silicon melting unit, transferring the molten silicon in a downward direction by driving a start block with silicon material, followed by solidifying the molten silicon from a lower portion thereof to an upper portion thereof to form a refined silicon ingot; and cutting off an upper portion of the refined silicon ingot to remove metal impurities from the silicon ingot, wherein the start block is made by melting a silicon button on a dummy bar by a second electron beam under a vacuum atmosphere of about 10