Abstract
Bauxite residue is generated from alumina production in the alumina refining industry by the Bayer process, which requires a large amount of land resource and causes serious environmental problems. In this paper, a novel recycling strategy is proposed to rehabilitate the land and produce the polyaluminium ferric sulfate (PAFS) and siliceous gypsum byproducts from the bauxite residue. The batch experiments reveal that the maximum Cr(VI) removal efficiency of as-prepared PAFS can reach 95.80% with an initial concentration of 10.41 mg/L. In addition, the non-toxic siliceous gypsum should be an ideal raw material for cement plants. Various characterizations (e.g., SEM, FTIR, and XRD) are employed to reveal the mechanism of synthesis PAFS and their Cr(VI) removal performance. Consequently, this paper provides a deep insight into the utilization of bauxite residue as a resource and gives a new strategy for preparing PAFS and gypsum from bauxite residue.
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Acknowledgements
This work has been supported by Hunan Provincial Key Research Plan Program of China (Grant Numbers 2021GK4059 and 2020SK2006), Natural Science Foundation of China (Grant Number 51804353) and Education Department of Hunan Province of China (Grant Number 18B195 and 17B276). The authors would like to extend special thanks to the editors and the anonymous reviewers for their constructive comments and suggestions for improving the quality of the paper.
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Lan, Z., Wan, S., Chen, R. et al. Fabrication of Polyaluminium Ferric Sulfate from Bauxite Residue for Efficient Removal of Cr(VI) from Simulated Wastewater. Bull Environ Contam Toxicol 109, 142–148 (2022). https://doi.org/10.1007/s00128-022-03494-7
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DOI: https://doi.org/10.1007/s00128-022-03494-7