화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.98, 298-307, June, 2021
DOI10.1016/j.jiec.2021.03.038  Export Citation
Innovative utilization of red mud through co-roasting with coal gangue for separation of iron and aluminum minerals
Jianping Jin1, 2, Xiao Liu1, 2, †, Shuai Yuan1, 2, Peng Gao1, 3, Yanjun Li1, 2, Hao Zhang1, 2, and Xiangzhi Meng4
  • 1School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, PR China
  • 2National-local Joint Engineering Research Center of High-efficient exploitation technology for Refractory Iron Ore Resources, Shenyang 110819, PR China
  • 3State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, PR China
  • 4School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, PR China
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Red mud and coal gangue are industrial solid wastes discharged during alumina extraction and coal mining, respectively. As these are hazardous materials, their disposal leads to serious environmental issues. In this study, an innovative utilization of red mud through co-roasting with coal gangue for separation and recycling of iron and aluminum minerals is presented. Under optimum co-roasting conditions (550 °C for 50 min), an iron concentrate containing 57.25% TFe (total iron content) with the recovery of 65.22%, and an aluminum-rich product containing 27.26% Al2O3 with the recovery of 71.37% were obtained after magnetic separation. The characteristics of mixed raw material and products all indicated that the goethite and hematite phases in the mixed raw material were transformed into a magnetite phase after co-roasting, although some of the magnetite generated during co-roasting was oxidized to hematite again. This study demonstrates that co-roasting of coal gangue and red mud is a promising technology for the reduction of iron and activation of aluminum to realize resource recycling without additional materials.
Keywords:Solid waste;Red mud;Coal gangue;Co-roasting;Separation;Iron concentrate
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