Patent ID: 8790584
Filing Date: 2014-07-29
Classification: C01B,H05H

Abstract:
1. System for refining UMG Si using steam plasma torch, comprising: a vacuum chamber; a cold crucible disposed within the vacuum chamber; a device for feeding UMG Si to the cold crucible; a steam plasma torch applying steam plasma to the Si fed to the cold crucible, the steam plasma formed by introducing a reactive gas into plasma flame by a first inert gas; and an impurity collector for collecting impurity gas generated from the cold crucible, wherein the plasma torch includes: an electrode rod having a predetermined length and formed with a tip at an end thereof and being electrically connected with an external cathode power supply; an internal cover surrounding the electrode rod in a longitudinal direction of the electrode rod with a first space formed between the internal cover and the electrode rod and being electrically connected with an external anode power supply; an external cover surrounding the internal cover in the longitudinal direction with a second space formed between the external cover and the internal cover; a nozzle cover unit having an internal nozzle cover connected with the internal cover and an external nozzle cover connected with the external cover, the internal nozzle cover covering the tip and having a horizontal nozzle end formed at a lower end thereof, the horizontal nozzle end being formed with a first orifice, the external nozzle cover covering the internal nozzle cover except for the horizontal nozzle end and having open bottom and a vertical nozzle end vertical to the horizontal nozzle end at a lower end thereof, the vertical nozzle end formed along a circumference of the horizontal nozzle end to the open bottom of the external nozzle cover, the vertical nozzle end being formed with a second orifice(s) in the upper part thereof and a third orifice(s) in the lower part thereof, wherein to the first orifice the first inert gas for generation of plasma is fed through the first space, to the second orifice the reactive gas for formation of steam plasma is fed through a tube installed in the second space, and to the third orifice a second inert gas for generation of plasma is fed through the second space.