Abstract
Nowadays, the comprehensive utilization of red mud is still a difficult problem. Using starch as the reducing agent, the "high-pressure hydrothermal reduction method" is used to separate and recover sodium, aluminum, and iron in high-iron red mud in one step in an alkaline hydrothermal system. This article focuses on the hydrothermal reduction behavior of the iron ore phase. The results showed that starch formed a strong reduction system through degradation under alkaline hydrothermal conditions, in which Fe2O3 was first partially dissolved and reduced to form Fe[OH]+, then Fe[OH]+ further reacted with Fe2O3 to form Fe3O4. At a temperature of 260°C, a C/S (calcium to silicon ratio) of 3.5, a Na2O concentration of 250 g/L, Whigh-iron red mud/Wstarch = 10, the Fe reduction rate was 98.46%, and the transformation slag at a magnetic field strength of 1800 Gs resulted in a magnetic iron concentrate powder with a TFe grade of 65.75%.
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Acknowledgements
This work was supported by the Support Plan of Innovative Talents in Universities of Liaoning (Grant No. 2020-LN-064), and the Doctoral Start-up Foundation of Liaoning Province, China (Grant No. 2020-BS-226). This work was also supported by the University of Science and Technology Liaoning Graduate Education Reform and Technology Innovation and Entrepreneurship Project (Grant No. LKDYC202004), and the Innovation Team Project of Yingkou Institude of Technology (Grant No. TD20190).
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Wang, H., Wang, Y., Jin, H. et al. Transformation Behavior of Iron Minerals in High-Iron Red Mud During High-Pressure Hydrothermal Reduction. Bull Environ Contam Toxicol 109, 76–85 (2022). https://doi.org/10.1007/s00128-022-03496-5
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DOI: https://doi.org/10.1007/s00128-022-03496-5