锰铁熔体脱磷热力学分析

摘要

The liquid ferromanganese dephosphorization was studied by means of thermodynamic analysis. The BaO-based slag has a better dephosphorization capacity with the suitably lower reaction temperature, on the condition that the diffusion kinetics is not the rate-determining factor. The less the silicon content in the liquid ferromanganese, the more the dephosphorization benefit. The manganese activity increases with decreasing carbon content of the liquid, and has a defective action on the oxidative dephosphorization and the manganese conservation, but an effective action on the reductive dephosphorization by calcium. Therefor, it is suitable for a high-carbon ferromanganese to use the oxidative dephosphorization, and for a refine ferromanganese to use the reductive dephosphorization.%热力学分析表明，以氧化钡为主的脱磷剂，在满足扩散动力学的条件下，温度愈低，脱磷率愈高；硅含量愈低，愈有利于脱磷；碳含量降低，锰活度将增加，不利于氧化脱磷和保锰。碳含量高将抑制钙的还原脱磷作用。对高碳锰铁，宜采用氧化脱磷。对精炼锰铁，宜采用还原脱磷。