Abstract：Kinetic experiments of the hot metal desulfurization were carried out using the CaO-SiO2-Al2O3-Na2O-TiO2 slag at 1 673 to 1 773 K in the laboratory to study the desulfurization rate. The results indicated that the desulfurization rate was accelerated and the melting effect of slag was enhanced with the temperature increasing. The sulfur content was changeless after about 50 min for most of desulfurization reactions. A mathematical model of kinetics of hot metal desulfurization was developed to calculate the mass transfer coefficients and the mass transfer resistance of the sulfur in the molten slag during the desulfurization process. The mass transfer coefficients of sulfur were in the range of 5.02×10－7-18.69×10－7 m/s. The estimated activation energy was 464.06 kJ/mol at 1 673 to 1 723 K and 176.35 kJ/mol at 1 723 to 1 773 K. The distribution of the sulfur at the slag-metal interface was observed by the Mineral Liberation Analyzer（MLA）.Combined with the image of MLA， it is finally concluded that the mass transfer of sulfur in molten slag was the restrictive step at a high temperature during the desulfurization process.
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2018, Vol. 53 
