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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。
Based on the molecular ion coexistence theory of slag structure, a CaO-SiO2-Al2O3-V2O3 quaternary system activity model was established. Based on the activity data calculated by this model, the thermodynamic calculation and analysis of the process of direct alloying vanadium iron oxide with vanadium oxide ore to smelt high speed steel were carried out. The activity data were used to calculate the equilibrium composition of slag when Al was used as the reductant. The calculated results show that the mass fraction of V2O3 in slag is very low, the thermodynamic conditions of direct alloying are good, and the maximum theoretical reduction rate of vanadium is high. The reduction of ΔG and LV of V2O3 in slag by calculating various reductants in steel or slag indicates that Al is the most reducible among all the reducing agents commonly used in the steelmaking process.