A thermodynamic model for predicting activity of CaO-SiO_(2)-Al_(2)O_(3)-MgO-TiO_(2)-V_(2)O_(3)-FeO slags during electric furnace smelting process  

作　　者：Jian-fa Jing Shuai Wang Yu-feng Guo Feng Chen Ling-zhi Yang Jian-feng Yang Fu-chun Xu 

机构地区：[1]School of Minerals Processing and Bioengineering,Central South University,Changsha,410083,Hunan,China

出　　处：《Journal of Iron and Steel Research International》2024年第9期2156-2172,共17页钢铁研究学报（英文版）

基　　金：the National Natural Science Foundation of China on the project 52104345 were acknowledged.

摘　　要：To optimize the comprehensive utilization of vanadium titanomagnetite by direct reduction-smelting processes,it is essential to acquire titanium slag with a higher TiO_(2)content of 45–60 wt.%.A thermodynamic model was developed based on the ion and molecule coexistence theory,specifically targeting the CaO–SiO_(2)–Al_(2)O_(3)–MgO–TiO_(2)–V_(2)O_(3)–FeO slag system.The impact of slag composition on the smelting of vanadium titanomagnetite was assessed,and the thermodynamic model was utilized to identify the optimal high-titanium slag.The results revealed that increasing the basicity,MgO content,and FeO content within the slag effectively suppressed the reduction of titanium and silicon oxides.Furthermore,the calculated activity coefficient of TiO_(2)decreased with higher basicity,MgO,and FeO levels.While an increase in basicity significantly enhanced the reduction of vanadium oxides,the effects of MgO and FeO contents on vanadium oxide reduction were comparatively less significant.Notably,higher basicity and FeO content promoted the formation of calcium titanates,whereas an elevated MgO content favored the formation of magnesium titanates.The smelting results indicated that a lower V_(2)O_(3)content and higher TiO_(2)activity corresponded to a smaller titanium mass fraction in the iron alloy,while the opposite trend was observed for vanadium.

关 键 词：Vanadium titanomagnetite Titanium slag VANADIUM Ion and molecule coexistence theory 

分 类 号：TF524[冶金工程—钢铁冶金]