Simulation Study on Direct Desulfurization of Molten Iron by Magnesium Vapor

A new technique of bottom blown method was proposed for desulfurization of molten iron, which uses inert gas to carry magnesium vapor and combines with mechanical stirring. A water model was established based on the similarity principle. Experimental phenomena were recorded by a high-speed camera combining with image processing method. The influence factors on bubbles disintegration and dispersion of molten pool were researched. By the stimulus response technique measuring changes of conductivity in the molten pool, influence factors of mixing time were studied. Results show that: the new technique is conducive to the bubble disintegration and dispersion of the molten pool, which shortens the uniform mixing time and prolongs the residence time of bubbles in the molten pool. The desulfurization efficiency can be enhanced and the removal time of sulfur is shortened. It can also reduce the temperature drop during desulphurization and be beneficial to improve the efficiency utilization of magnesium in iron industry.