Abstract
With the increasing awareness of environmental protection, the disposal of solid waste such as red mud (RM) and silica fume (SF) has attracted widespread attention. In this study, a novel method by recycling RM and SF simultaneously was proposed for preparing Fe-Si alloy and extracting alumina. The process is mainly composed of vacuum carbothermal reduction and magnetic separation. The results show that Fe-Si alloy was successfully synthesized during the vacuum carbothermal reduction and it was effectively separated during the magnetic separation. Additionally, after the magnetic separation, the non-magnetic portion mainly contains alumina and it can be a potential raw material to produce alumina by the Bayer process. This process could recycle RM and SF simultaneously, and almost no waste residue was generated. Therefore, it provided a clean and sustainable route for synergistic recycling of RM and SF.KeywordsFe-Si alloyAlumina extractionRed mudSilica fumeVacuum carbothermal reduction
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