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JOM

, Volume 71, Issue 9, pp 2936–2943 | Cite as

Comprehensive Recovery of Iron and Aluminum from Ordinary Bayer Red Mud by Reductive Sintering–Magnetic Separation–Digesting Process

  • Feng GaoEmail author
  • Jihao Zhang
  • Xinjie Deng
  • Kaituo Wang
  • Chunlin He
  • Xinsheng Li
  • Yuezhou Wei
Aluminum: Recycling and Environmental Footprint
  • 210 Downloads

Abstract

Iron and aluminum in red mud were recovered by a reductive sintering–magnetic separation–digesting process. The raw materials were composed of ordinary Bayer red mud, MgO, Na2CO3 and C, in which MgO and Na2CO3 were used as mineralizing agents, and C as a reductive agent. Sintering orthogonal experiments showed that 55.03% content of iron concentrate with 91.02% iron recovery could be obtained using sintering conditions of 1200°C for 90 min and mole ratio (MgO/SiO2) of 1.3. Following magnetic separation of the sintered product, orthogonal experiments on the digestion of the nonmagnetic residue showed that the highest aluminum recovery, 70.15%, was achieved using digesting conditions of 90°C, 20 min and 3% NaOH concentration. Analysis of the recovered products showed that Fe2O3 and Al2O3 can be transformed simultaneously into Fe and NaAlO2 phases, and most of the iron aggregates in the larger metallic particles in the sintering process contribute to the high iron recovery.

Notes

Acknowledgements

The authors would like to thank the financial support from the Programs for Natural Science Foundation of Guangxi (2017GXNSFAA198206, 2015GXNSFAA139268), the Key University Science Research Projects of Guangxi Province (KY2015ZD001), Guangxi Key Laboratory Development Foundation (GXYSSF1802) and the Scientific Research Foundation of Guangxi University (DD1330019).

Supplementary material

11837_2018_3311_MOESM1_ESM.pdf (974 kb)
Supplementary material 1 (PDF 973 kb)

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Feng Gao
    • 1
    • 2
    Email author
  • Jihao Zhang
    • 1
    • 2
  • Xinjie Deng
    • 1
    • 2
  • Kaituo Wang
    • 1
    • 2
  • Chunlin He
    • 1
    • 2
  • Xinsheng Li
    • 1
    • 2
  • Yuezhou Wei
    • 1
    • 2
  1. 1.Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured MaterialsGuangxi UniversityNanningPeople’s Republic of China
  2. 2.School of Resources, Environment and MaterialsGuangxi UniversityNanningPeople’s Republic of China

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