A thermodynamic model of desulfurization for CaO-SiO2-MgO-Al2O3-Na2O slag based on IMCT theory
LEI Jia-liu1， ZHAO Dong-nan1， ZHU Hang-yu2， JIANG Yue-dong3
（1. Metallurgy Engineering Department， School of Materials Science and Engineering， Hubei Polytechnic University，Huangshi 435003， Hubei， China； 2. Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources， Wuhan University of Science and Technology， Wuhan 430081， Hubei， China）
3. Wuhan Branch， Baosteel Central Research Institute， Wuhan 430080， Hubei， China
Abstract：In order to accurately characterize the desulfurization capacity of the Na2O-containing slag system and improve the desulfurization effect， the thermodynamic model for the mass action concentrations calculation for the CaO-SiO2-MgO-Al2O3-Na2O slag system and the thermodynamic model of the desulfurization for the slag at 1 753 K were established， based on the ion and molecule coexistence theory （IMCT）. Then the influence factors of total sulfur distribution ratio and the respective sulfur distribution ratio of the slag were discussed and analyzed. The theoretical results showed that， aparting from the LS， MgS， with the increasing of the mass percent of Al2O3， the desulfurization capacity of the slag significantly decreased. While the increasing of the mass percent of MgO and Na2O can significantly promote the desulfurization capability of the slag. In addition， a small amount of the mass percent of Na2O showed a strong effect on the desulphurization capability， which provided a theoretical basis for the application of the Na2O-containing secondary metallurgical resources and the optimization of the desulfurization slag system in the desulphurization process for the hot metal.
雷家柳， 赵栋楠， 朱航宇， 蒋跃东. 基于IMCT理论的CaO-SiO2-MgO-Al2O3-Na2O渣系的脱硫热力学模型[J]. 钢铁, 2019, 54(3): 35-41.
LEI Jia-liu1， ZHAO Dong-nan1， ZHU Hang-yu2， JIANG Yue-dong3. A thermodynamic model of desulfurization for CaO-SiO2-MgO-Al2O3-Na2O slag based on IMCT theory. Iron and Steel, 2019, 54(3): 35-41.
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2019, Vol. 54 
