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Correlation between aggregation structure and tailing mineral crystallinity |
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| Authors: | Wen-tao Hu Xin-wei Li Hua-jun Wang Chuan-yao Sun Xu-qin Duan |
| Institution: | 1. State Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, University of Science and Technology Beijing, Beijing, 100083, China 2. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China 3. State Key Laboratory of Mineral Processing Science and Technology, Beijing General Research Institute of Mining and Metallurgy, Beijing, 100070, China |
| Abstract: | Direct reduction is an emerging technology for the utilization of refractory iron ore. With this technology, iron oxides in the ore can be reduced to recoverable elemental iron. The structure of granular aggregates in direct reduction products was investigated by X-ray diffraction (XRD). The results show that iron is mainly generated as a shell in the outer edge of the aggregates. The thermal conductivity of the iron shell is higher than that of other minerals. Thus, minerals close to the iron shell cool faster than those in the inner shells and do not crystallize well. These minerals mainly become stage 2 tailings. Hence the XRD intensity of stage 2 tailings is lower than that of stage 1 tailings. When iron is mainly generated in the interior of the aggregates, the crystallinity of stage 2 tailings will be higher than that of stage 1 tailings. This indicates that the crystallinity of tailings can be used as a marker for the aggregate structure. |
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