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There is a limit for lowering nitrogen in steel because nitrogen is absorbed into metal by contact with air during and after degassing. Therefore, the nitride capacity of various fluxes has been measured with the aim of exploring the slag with the higher capacity and investigating the possibility of nitrogen removal by using slag. However, for the efficient removal of nitrogen to the atmosphere through the slag phase, it is also important to take into account the nitrogen reaction rate between gas and slag phases and know the nitrogen behavior through successive phases of metal, slag, and gas in practical steelmaking process. In the previous work, we have examined the nitrogen removal rate from molten iron to the gas phase through CaO–Al2O3 melt, of which the nitride capacity has been already reported, and it is found important to keep the oxygen partial pressure in the gas phase higher and the oxygen potential at the slag/metal interface lower for the efficient nitrogen removal. From the derived equation, it can be also considered that the nitrogen is removed from slag to gas phases even if the nitrogen partial pressure of the gas phase is high, except the strong reducing atmosphere. In the present study, the nitrogen removal rate from molten Fe–1mass%Al alloy to the gas phase through CaO–Al2O3–CaF2 melt has been investigated in N2–Ar and N2–O2 atmosphere and the applicability of the mixed rate determining model derived in the previous work has been examined.

Nitrogen Removal from Molten Iron to Gas Phase through CaO-Al2O3-CaF2 Melt.