Patent ID: 8551439
Filing Date: 2013-10-08
Classification: C01B

Abstract:
1. A method of refining carbon parts for the production of polycrystalline silicon, comprising the steps of: a) replacing an inside gas of a reactor, in which the carbon parts are placed, with an inert gas; b) drying the carbon parts by raising a temperature in the reactor to a drying temperature of the carbon parts while flowing an inert gas through the reactor after the step of a); c) raising a temperature in the reactor to a purification temperature higher than the drying temperature while flowing chlorine gas through the reactor after the step of b); d) reducing a pressure in the reactor after the step of c); e) maintaining the inside of the reactor in a reduced pressure caused by the step of d); f) pressurizing the inside of the reactor by introducing chlorine gas for bringing the inside of the reactor into a pressurized state after the step of e); and g) cooling the inside of the reactor after the step of f).