Excess vaporization of Na from Na2O-SiO2 molten slag by transfer thermal plasma of Ar

Abstract

The transfer thermal plasma of argon (Ar) was deposited onto the surface of a Na2O-SiO2 molten slag at about 1200 to 13.50 C. using a hybrid plasma furnace composed of transfer- and non-transfer plasma. Only the non-transfer plasma of Ar was deposited onto the slag, there was little vaporization of Na according to the thermodynamics. When the transfer plasma current was greater than 3 A. the amount of Na vaporized from the surface was seven times larger than the amount calculated by Faraday's Law. ©2009 The Japan Institute of Metals.