铝热法冶炼钒铁渣的熔化性能

Melting performance of the slag system from FeV alloy production by thermit method

摘要: 采用热力学软件FactSage中的Equilib和Phase Diagram模块分别对Al₂O₃-CaO-MgO三元渣系的熔化性能及添加助熔剂后对渣系熔点的影响进行理论分析，并实验测定渣系的实际熔点.发现渣系熔点随w（Al₂O₃）/w（CaO）比的升高先降低后升高，w（MgO）为4%～5%时渣系熔点最低.对于w（Al₂O₃）/w（MgO）>3的渣系，w（CaO）<30%时渣系熔点随w（CaO）增加而降低.2<w（Al₂O₃）/w（CaO）<2.5，w（MgO）为15%～18%时，钒铁渣中加2.29%AlCl₃、4.86% Fe₂O₃或4.77% Na₂O时均可降低原渣熔化性温度约100℃.

Abstract: The melting performance of an Al₂O₃-CaO-MgO ternary slag system and the effect of added fluxes on the melting point of the slag system were theoretically analyzed by using Equilib and Phase Diagram modules in thermodynamic software FactSage. The melting temperature of the slag system from production was measured. It is found that the melting point of the slag system decreases first and then increases with increasing w(Al₂O₃)/w(CaO) ratio, and it reaches the lowest value when w(MgO) is 4% to 5%. At the w (Al₂O₃)/w(MgO) ratio more than 3 and w(CaO) less than 30%, the melting point decreases with increasing w(CaO). When 2〈w (Al₂O₃)/w(CaO) 〈2.5 and w(MgO) is 15% to 18%, the melting point can decrease about 100℃ with the addition of 2.29% AlCl₃, 4.86% Fe₂O₃ or 4.77% Na₂O in the slag system.