|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||8th International Symposium on High Temperature Metallurgical Processing
||Investigate on the Phase Composition of Vanadium Slag with High CaO Content and Influence of P2O5 on Crystallization Kinetics of Spinels
||Wang Zhou, Bing Xie, Zhao-Qun Ke, Jiang Diao, Wen-Feng Tan, Yu-Hao Liu, Hong-Yi Li, Tao Zhang
|On-Site Speaker (Planned)
An effective way to decrease the dephosphorization burden in the current vanadium extraction-steelmaking process is adding CaO into the vanadium extraction step. The phase composition of vanadium slag with different basicity and the regularities distribution of elements have been investigated by X-ray diffraction analysis and scanning electron microscopy combining with energy disperse X-ray spectrometry (SEM/EDS), respectively. The results indicate that V mainly concentrates in the spinel phases; Ca and P are rich in the silicate phases. While the basicity of vanadium slag is 1.3, Fe2SiO4 transform to CaFeSiO4. With further increase of basicity, 2CaO·SiO2 could form in the silicate phases. Moreover, the phosphorus-containing phase will transform from Ca3(PO4)2 to Ca3(PO4)2-Ca2SiO4. With the increase of P2O5 content, the crystallization rate of spinels decrease obviously. Furthermore, the peak temperature for crystallization of spinels decrease 5K with P2O5 content increasing 1wt%.
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