Excess Vaporization of Na from Na₂O-SiO₂ Molten Slag by Transfer Thermal Plasma of Ar

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The transfer thermal plasma of argon (Ar) was deposited onto the surface of a Na₂O-SiO₂ molten slag at about 1200 to 1350°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.