Phosphorus Capacity of CaO-SiO2-Al2O3-MgO-Fex O Slag

• Published in: 钢铁研究学报：英文版 2015 (5), p.377-381
• Main Author: Jian-chao LI Qing LU Xiao-jie LIU Shu-hui ZHANG Dong-hui LIU
• Format: Article
• Language: English
• Subjects: MgO含量; 二氧化硅; 容量; 平衡技术; 氧化钙; 氧化铝; 炼铁技术; 脱磷
• ISSN: 1006-706X; 2210-3988

CaO-SiO2-Al2O3-MgO-Fex O slag occurs in the production process of Corex ironmaking technology. Most of its metallurgical properties, especially the phosphorus property, are different from the slag produced from blast furnace or converter. In order to explore the dephosphorization ability of CaO-SiO2-Al2O3-MgO-Fex O slag, its phosphorus capacity was measured at 1673 K by gas-slag-metal equilibrium technique. An iron crucible was used as the reaction vessel, Ag alloy with 0.2 % P was used as the metal phase which equilibrated with CaO-SiO2-Al2O3-MgO-Fex O slag, and a constant flow of CO-CO2-N2 gas was used to provide oxygen partial pressure in the experi- ment. The effects of MgO, Fex O and basicity on slag phosphorus capacity were investigated by single factor test. The results show that the phosphorus capacity rises firstly and then decreases with increasing MgO content under the condition of basicity 1.3, Fe2 O content of 20% and A12 03 content of 12%. The phosphorus value reaches maximum as the MgO content is 8%. When the basicity of slag is 1.1, MgO content is 10%, and Al2O3 is 12%, the phos- phorus capacity increases with the increase of Fe, O content. The phosphorus capacity rises linearly when the basicity is increased from 1.1 to 1. 5.