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Calcification-Carbonation Method for Bayer Red Mud Treatment: Carbonation Performance of Hydrogarnets

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Abstract

Hydrogarnets are vital intermediate products in the calcification- carbonation method, which is designed for Bayer red mud treatment. Their carbonation performance greatly depends on SiO2 substitution. In this study, different SiO2-substituted hydrogarnets were synthesized and characterized. Then, batch experiments were performed to evaluate the potential effects of important parameters such as CO2 pressure, and SiO2 substitution degree (x) on the carbonation process. The SiO2 substitution degrees of the hydrogarnets synthesized at 60, 120, 180, and 240°C were 0.27, 0.36, 0.70, and 0.73, respectively. As the SiO2 substitution degree increased, the hydrogarnet carbonation extents gradually declined. With an increase in CO2 pressure, the hydrogarnet carbonation percentages increased gradually and rose from 80.33% to 98.19% within 120 min. The phases detected in the carbonized products were strip-like aragonite as well as some calcite; the Al-rich and Si-rich phases in the carbonized products were amorphous.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51904139, 52164034), Youth Science and Technology Foundation of Gansu Province (No. 20JR10RA192) and the Open Fund of Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education, Northeastern University (No. NEMM2019004).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Xiaofeng Zhu, Yongmei Liu, Fengqi Jiang & Bin Li

  2. Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education, Special Metallurgy and Process Engineering Institute, School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Guozhi Lv & Ting-an Zhang

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  1. Xiaofeng Zhu
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  2. Yongmei Liu
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  3. Fengqi Jiang
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  4. Bin Li
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  5. Guozhi Lv
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  6. Ting-an Zhang
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Correspondence to Ting-an Zhang.

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Zhu, X., Liu, Y., Jiang, F. et al. Calcification-Carbonation Method for Bayer Red Mud Treatment: Carbonation Performance of Hydrogarnets. Bull Environ Contam Toxicol 109, 68–75 (2022). https://doi.org/10.1007/s00128-022-03522-6

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  • DOI: https://doi.org/10.1007/s00128-022-03522-6

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