高碳铬铁和氧化钼直接合金化冶炼过程热力学分析

基于直接还原理论,对高碳铬铁和氧化钼直接合金化冶炼过程进行了热力学分析。在共同作用理论基础上,建立了CaO-SiO2-FeO-MoO3-Cr2O3渣系活度计算模型,分析了铁液和熔渣中各组元活度及对氧化钼直接还原合金化过程的影响。结果表明:在高碳铬铁铁液中饱和C]和外配还原剂焦炭的作用下,将氧化钼直接合金化得到一种碳素铬钼铁合金是完全可行的。MoO3在熔渣中活度很小,还原率高;高碳铁液中C、Cr元素有效降低了合金中Mo的活度,保证了Mo具有较高收得率,为铬钼铁合金的冶炼提供了理论依据。

Thermodynamic Analysis of Direct Smelting and Alloying Process of High-Carbon Ferrochrome and Molybdenum

Based on the direct reduction theory, the thermodynamic analysis of direct smelting and alloying process of high-carbon ferrochrome and molybdenum was carried out. The activity calculation model of slag system of CaO-SiO2-FeO-MoO3-Cr2O3 was established on the basis of coexistence theory. The activity of each component in the molten iron and slag and their effects on molybdenum direct alloying were analyzed. The results show that under the action of the saturated carbon in the molten iron of high-carbon ferrochrome and the addition reductant coke, the direct alloying by molybdenum and making a new type of carbon Cr-Mo ferroalloy are entirely feasible. The activity of MoO3 is low in the slag, which leads to its high reduction rate; the C, Cr in molten iron reduce the activity of Mo effectively which ensured the Mo with a high yield and provides theoretical basis for smelting Cr-Mo ferroalloy.