Dephosphorization during the Process of Vanadium Extraction from Vanadium-bearing Hot Metal Based on the Coexistence Theory of Slag Structure
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摘要: 基于共存理论建立钒渣活度计算模型,研究含钒铁水提钒同时脱磷而加入的CaO对提钒及脱磷带来的影响。渣铁平衡试验结果表明在低碱度(R<1)时,钒和磷的分配比计算值和试验值吻合较好,回归分析得到了提钒率DV和脱磷率DP的关系:DV=72.43+0.79DP。模型对转炉钒渣的计算结果表明碱度升高增大磷和钒在渣金间的分配比,其中对磷的增大更加明显;温度的升高不利于提钒,但在低碱度(R<1)时有利于脱磷;碱度的升高对渣中其它组分的影响表现为使FeO、Mn O的活度和活度系数下降,SiO2、TiO2的活度和活度系数上升。Abstract: The activity model of vanadium slag was established according to the coexistence theory of slag structure,based on which the influence of CaO addition on the dephosphorization of liquid iron containing vanadium during the process of producing vanadium slag was conducted in this paper.The equilibrium experiments between the hot metal and the molten slag were designed to validate the proposed model.In the comparison of the calculated value with the measured value,it was found that the calculated value of vanadium and phosphorus distribution ratio (LV and LP) between slag and melt agreed well with that of the measured value when the binary basicity was low(R<1).And the relationship DV=72.43+0.79 DPwas obtain through regression analysis.The model calculation results indicated that both LV and LP increased with the increase of the binary basicity,and the effect on LPis more obviously.The increase of temperature will reduce LV,however,it can increase LP when the binary basicity was low(R<1).With the increase of binary basicity,the activity and activity coefficient ratio of FeO and Mn O increased and that of SiO2 and TiO2 decreased.
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Key words:
- vanadium-bearing hot metal /
- vanadium extraction /
- dephosphorization /
- activity
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