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Dealkalization of Bauxite Residue Through Acid Neutralization and Its Revegetation Potential

  • Bauxite to Aluminum: Advances, Automation, and Alternative Processes
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Abstract

Bauxite residue is a highly alkaline industrial solid waste generated through the alumina production process. Its high alkalinity causes serious environmental pollution. In this article, a fast, high-efficiency, low-cost dealkalization process was developed. Bauxite residue was dealkalized by sulfuric acid and CAM, a calcium-containing compound. The revegetation potential of dealkali bauxite residue was also studied. The dealkalization rate reached up to 94.31% when 18.4% sulfuric acid was added, and 2% CAM leaching occurred at room temperature for 10–30 min. The filtration speed increased by about 70 times with the addition of CAM up to 4.5%. The subsequent pot experiment showed that the dealkali bauxite residue met the growth requirements of plants. Scanning electron microscopy analysis showed that the particle size of neutralized bauxite residue was enlarged, thereby accelerating the soil formation process of the bauxite residue. This work provides technical support for ecologic restoration of a bauxite residue disposal area.

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Acknowledgements

This work was supported financially by the National Key Research and Development Program of China (No. 2018YFC1901901), Natural Science Foundation of China (Nos. U1704252, 51704329), Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources (No. 2018TP002), and Collaborative Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources and Open Foundation of State Key Laboratory of Mineral Processing (No. BGRIMM-KJSKL-2019-18).

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Authors and Affiliations

  1. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China

    Hua Zeng, Fei Lyu, Guangyan Hu, Honghu Tang, Li Wang, Wei Sun, Yuehua Hu & Runqing Liu

  2. State Key Laboratory of Mineral Processing, Beijing General Research Institute of Mining & Metallurgy, Beijing, 100000, China

    Li Wang & Wei Sun

  3. Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-Containing Mineral Resources, Central South University, Changsha, 410083, China

    Hua Zeng, Fei Lyu, Guangyan Hu, Honghu Tang, Li Wang, Yuehua Hu & Runqing Liu

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  1. Hua Zeng
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  2. Fei Lyu
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  3. Guangyan Hu
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  4. Honghu Tang
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  5. Li Wang
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  6. Wei Sun
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Correspondence to Li Wang or Wei Sun.

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Zeng, H., Lyu, F., Hu, G. et al. Dealkalization of Bauxite Residue Through Acid Neutralization and Its Revegetation Potential. JOM 72, 319–325 (2020). https://doi.org/10.1007/s11837-019-03911-z

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  • DOI: https://doi.org/10.1007/s11837-019-03911-z

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