根据熔渣结构的分子离子共存理论建立了CaO-SiO2-Al2O3-V2O3四元系活度模型。应用该模型计算出的活度数据,对用钒氧化物矿代替钒铁直接合金化冶炼高速钢的工艺过程进行了热力学计算和分析。用此活度数据计算了Al作还原剂时渣的平衡成分。计算结果表明,渣中V2O3的质量分数极低,直接合金化的热力学条件好,钒的理论最大还原率高。通过计算钢中或渣中的各种还原剂还原渣中V2O3的ΔG和LV,表明在炼钢工艺常用的所有还原剂中,Al的还原能力最强。
An activity model of CaO-SiO2-Al2 O3-V2O3 quaternary system is built accord- ing to the molecule-ion coexistence theory of slag structure. A thermodynamics analysis of the process for producing high speed steel using direct alloying of vanadium oxide to replace vanadium iron is made. Slag equilibrium composition is calculated by the activity data. The results show that the content of V2O3 in slag is very low, the thermodynamics of direct alloying is good, and the theoretical yield of vanadium is high. In addition, AG and Lv of V2 O3 reduction by various reductants are calculated by the activity data. The results show that Al is the strongest reductant among normal reductants adopted in steelmaking process.
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