Abstract
One-step separation and recovery of sodium, aluminum and iron in high-iron red mud in a high-calcium alkaline hydrothermal system is realized by a high-pressure hydrothermal reduction process. The transformation behavior of the aluminasilica phase in high-iron red mud is mainly investigated. The results show that under the optimized conditions, a temperature of 290℃, a Na2O concentration of 240 g/L, a calcium to silicon ratio of 3.5, and a liquid–solid ratio of 5, the Na2O content in the transition slag is reduced to 0.12%, the dealkalization rate can reach 98%, and the alumina dissolution rate is 73%. When the starch-free reductant is added, the transition slag mainly consists of hematite and hydroandradite, and when the starch reductant is added (the addition amount is 1/4 that of ω(Fe2O3) in the red mud), all Fe2O3 in the transition slag is completely reduced to Fe3O4, and the main phases are magnetite and hydrogrossular.
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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. LKDYC202106), and the Innovation Team Project of Yingkou Institude of Technology (Grant No. TD20190).
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Wang, X., Wang, Y., Jin, H. et al. Phase Transformation Behavior of the Aluminosilicate Phase During High-Pressure Hydrothermal Reduction of High-Iron Red Mud. Bull Environ Contam Toxicol 109, 186–193 (2022). https://doi.org/10.1007/s00128-022-03492-9
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DOI: https://doi.org/10.1007/s00128-022-03492-9