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Due to the increasing strict requirements on steel quality, controlling the content of sulfur which is the main impurity element has become more important.1) External desulfurization of hot metal has proven to be suitable technology for controlling sulfur content due to its low cost. Magnesium, as a refining agent, is widely used for the treatment of various high quality steels owing to its strong affinity for non-metallic elements such as oxygen, sulfur, phosphorus and nitrogen.2–5) While being desulfurized from molten iron with passivation magnesium particles, the equilibrium constant of desulfurization reaction is 2.06×104, slag can not only reduce largly, temperature drop is not high, but also high quality steel can be obtained.6–9) At present, there are insufficiencies on the hot iron pretreatment with magnesium. Firstly, the equilibrium relation between the magnesium vapor pressure PMg and the temperature T is given by, lgPMg=−6 802/T+9.993, where PMg is magnesium vapor pressure, Pa; and T is absolute temperature, K. The results show that when the temperature is between 1 573 K and 1 723 K, magnesium vapor pressure, PMg, varies between 0.405 Mpa and 0.993 MPa.10) Therefore, it will produce an explosive reaction when magnesium is added into hot metal too quickly, which will lead to serious splash and significant loss of hot metal, and the utilization efficiency of magnesium will be decreased, so magnesium particles for desulfurization must be passivated. Secondly, saturated vapor pressure of Mg is very large at high temperature during the desulfurization process, so Kinetics of Generation of Magnesium Vapor of Novel Magnesiabased Desulfurizer for External Desulfurization of Hot Metal

Kinetics of Generation of Magnesium Vapor of Novel Magnesia-based Desulfurizer for External Desulfurization of Hot Metal