Influence of Hot Metal Composition on Ar-1Mg Gas-Metal Reaction in Magnesium Desulfurization Process

摘要

The influences of oxygen O, sulfur S, carbon C, silicon Si, manganese Mn and phosphorus P in hot metal on the reaction of an Ar-1Mg(g) bubble rising in the hot metal during desulfurization by granulated magnesium (Mg) injection were analysed by kinetic simulation. The increase in 0 decreases the Mg yield of the process. This study suggests that the Mg yield can be improved and the process time be shortened by the pre-deoxidation of the hot metal. The Mg(g) in gas is consumed by four routes: the dissolution into metal; desulfurization; deoxidation; and the remainder in bubbles. The variation of the fraction of the Mg(g) for each route with O, S or C is significant, but that with Si, Mn or P is marginal. The content of Mg(g) in the process offgas is lower in the earlier injection period, but it is higher and increases with decreasing C in the final injection period.