Abstract
In order to know what effect on the yield of alloy elements will be if the steel is melted/refined with the DC arc furnace, the effect of melting and refining with DC-arc on the yield of alloy element has been investigated by a melting experiment, in which the melting/refining is switched to continuous melting/refining with DC-arc after the molten metal is contact with the molten slag for 41 minutes without DC-arc, and by a contrast experiment of melting/refining with DC-arc and with an AC-arc. When DC current passes through the slag-metal interface and the slag-gas interface, the existence of the electrolysis phenomenon during the DC-arc steel melting/refining has been confirmed. Electrolysis participates in the metallurgical reaction. The phenomenon of two or more electrode reactions taking place simultaneously at both the slag-metal interface and the slag-gas interface has also been observed. The two phenomena cause the accelerating loss of the alloy-elements in the molten metal and the decreasing of concentrations of the corresponding oxides in the molten slag. The electrochemical transfer of oxygen from the molten slag to the molten metal ((O2-)=[+2e and (O2-)=1/2O2+2e) at the slag-metal interface has been observed, and causes the increasing of oxygen content in the molten metal.
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