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Extraction of iron and aluminum from high-iron bauxite by ammonium sulfate roasting and water leaching

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Abstract

High iron content is one of the challenges in utilizing the refractory bauxites in China. An improved method for treating the high-iron bauxite by roasting with (NH4)2SO4 was proposed, which offers a possible alternative method for utilizing the high-iron bauxite. The influences of the roasting time, roasting temperature, material ratio, and ore particle size on the extraction ratios of Fe and Al were studied, and the orthogonal test was used to optimize the reaction conditions. The optimized reaction conditions were proposed as follows: roasting temperature of 450 °C, roasting time of 120 min, material ratio of (NH4)2SO4 to ore of 2.5:1.0, and ore particle size below 80 μm. The roasting mechanism and kinetic parameters including the apparent activation energy and reaction rate constant were investigated. The results showed that the control step of the roasting process was the internal diffusion on the product layer and the apparent activation energy was 19.22 kJ mol−1 in the reaction temperature range. The kinetic equation was obtained finally.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51774070), the National Basic Research Program of China (2014CB643405), and the Fundamental Research Funds for the Central Universities of China (150204009).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, China

    Ding Tian, Xiao-yi Shen & Yu-chun Zhai

  2. School of Material Science and Engineering, Dalian Jiaotong University, Dalian, 116028, Liaoning, China

    Ding Tian

  3. Liaoning Key Laboratory for Metallurgical Sensor and Technology, Northeastern University, Shenyang, 110819, Liaoning, China

    Xiao-yi Shen

  4. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao, 066004, Hebei, China

    Yu-chun Zhai

  5. Department of Chemical & Biomolecular Engineering, University of Melbourne, Melbourne, 3010, VIC, Australia

    Penny Xiao & Paul Webley

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  1. Ding Tian
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  2. Xiao-yi Shen
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  3. Yu-chun Zhai
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Correspondence to Xiao-yi Shen or Yu-chun Zhai.

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Tian, D., Shen, Xy., Zhai, Yc. et al. Extraction of iron and aluminum from high-iron bauxite by ammonium sulfate roasting and water leaching. J. Iron Steel Res. Int. 26, 578–584 (2019). https://doi.org/10.1007/s42243-018-0128-x

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  • DOI: https://doi.org/10.1007/s42243-018-0128-x

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