Considering the different physical and chemical properties between
magnesium granules and calcium carbide powders, the thermodynamics, mechanism and kinetics of
desulphurization in
hot metal by magnesium
injection were mainly discussed. Based on the analysis about the influences of the mixing time, the penetration ratio of injected powder and the residence time of injected powder in the bath on the desulphurization
process, a mathematical
model which taken these three parameters into account was developed to simulate the desulphurization rate of hot metal by co injection of magnesium CaC 2 mixture, and the coupling effect between magnesium and CaC 2 was discussed. The water model experiment results, the flow field information from the authors and the industrial data from Baoshan Iron and Steel Company were used to determine the model parameters and verify the model, which can make the prediction values from the model agrees well with practical ones. The simulated results showed that the dissolved magnesium plays a main role in desulphurization. The relative desulphurization rates of Mg and CaC 2 are different at different stages of the injection process, whereby an appropriate injection diagram was proposed.
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