Phase transformation in suspension roasting of oolitic hematite ore
来源期刊：中南大学学报(英文版)2015年第12期
论文作者：LI Yan-jun WANG Ru HAN Yue-xin WEI Xin-chao
文章页码：4560 - 4565
Key words：oolitic hematite ore; suspension roasting; Mossbauer spectrum; magnetic property; phase transformation
Abstract: Suspension roasting followed by magnetic separation is a promising method to upgrade oolitic hematite ore. An oolitic hematite ore was roasted using suspension roasting technology at different temperatures. The phase transformation for iron minerals was investigated by XRD and Mossbauer spectrum, and the characteristics of roasted product were analyzed by VSM and SEM-EDS. Results indicate that the magnetic concentrate is of 58.73% Fe with iron recovery of 83.96% at 650 °C. The hematite is rapidly transformed into magnetite during the roasting with transformation ratio of 92.75% at 650 °C. Roasting temperature has a significant influence on the phase transformation of hematite to magnetite. The transformation ratio increases with increased temperature. After roasting, the magnetic susceptibility is significantly improved, while iron ore microstructure is not altered significantly.
LI Yan-jun(李艳军)1, WANG Ru(王儒)1, HAN Yue-xin(韩跃新)1, WEI Xin-chao(魏新超)2
(1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;
2. College of Engineering, The State University of New York Polytechnic Institute, Utica, NY 13502, USA)
Abstract:Suspension roasting followed by magnetic separation is a promising method to upgrade oolitic hematite ore. An oolitic hematite ore was roasted using suspension roasting technology at different temperatures. The phase transformation for iron minerals was investigated by XRD and Mossbauer spectrum, and the characteristics of roasted product were analyzed by VSM and SEM-EDS. Results indicate that the magnetic concentrate is of 58.73% Fe with iron recovery of 83.96% at 650 °C. The hematite is rapidly transformed into magnetite during the roasting with transformation ratio of 92.75% at 650 °C. Roasting temperature has a significant influence on the phase transformation of hematite to magnetite. The transformation ratio increases with increased temperature. After roasting, the magnetic susceptibility is significantly improved, while iron ore microstructure is not altered significantly.
Key words:oolitic hematite ore; suspension roasting; Mossbauer spectrum; magnetic property; phase transformation
