|Cite this article as:|
|Qiang Zhang, Yongsheng Sun, Yuexin Han, Yanjun Li, and Peng Gao, Review on coal-based reduction and magnetic separation for refractory iron-bearing resources, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2408-x|
The application of coal-based reduction in the efficient iron recovery from refractory iron-bearing resources is comprehensively reviewed. Currently, the development and beneficiation of refractory iron-bearing resources has attracted increasing attention. However, the effect of iron recovery by traditional beneficiation methods is unacceptable. The coal-based reduction and magnetic separation is proposed, which adopts coal as the reductant to reduce the iron oxides to metallic iron below the melting temperature. The metallic iron particles aggregate and grow, and the particle size continuously increases to be suitable for magnetic separation. The optimization and application of coal-based reduction have been abundantly researched. A detailed literature study on coal-based reduction is performed from the perspectives of thermodynamics, reduction kinetics, growth of metallic iron particles, additives, and application. The coal-based reduction industrial equipment can be developed based on the existing pyrometallurgical equipment rotary hearth furnace and rotary kiln, which is introduced briefly. However, the coal-based reduction is characterized by high carbon dioxide emissions, high energy consumption and high pollution. The development and application of coal-based reduction is expectedly hindered in the future. Technological innovation aiming at decreasing carbon dioxide emissions is a new trend of green and sustainable development of the steel industry. At present, substituting the coal with hydrogen for the iron oxides reduction is promising.