NITROGEN TRANSFER BETWEEN CaO-SiO2 BINARY SLAG AND CARBON SATURATED IRON.

This study was made on the reaction of the nitrogen transfer between CaO-SiO//2 binary slag and carbon saturated iron melted in graphite crucible under an atmosphere of nitrogen, where the reactions of nitrogen absorption in slag and silica reduction to metal occurred simultaneously. The rates of nitrogen transfer were expressed by a zero order reaction for the forward reaction (from slag to metal) and a second order reaction for the backward reaction. The results show that the reaction of nitrogen transfer from slag to metal proceeds electrochemically and nitrogen in metal is partially removed to CO bubbles formed at the slag-metal interface. It appears that the rates of each reaction are controlled by chemical reactions and are greatly influenced by the advance of the reaction of silica reduction.