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Research on Bayer Red Mud Slurry Electrolysis.

Shengnan Lin1, Tingan Zhang2, Boran Zhang1

  • 1School of Metallurgy, Key Laboratory of Ecological Metallurgy of Multi-metal Intergrown Ores of Ministry of Education, Northeastern University, 110819, Liaoning Shenyang, China.

Bulletin of Environmental Contamination and Toxicology
|May 13, 2022
PubMed
Summary

This study explores removing sodium from Bayer red mud using slurry electrolysis with different leaching agents. Hydrochloric acid achieved the highest sodium removal rate, suggesting a cost-effective pre-treatment method.

Keywords:
Bayer red mudSlurry electrolysisSodium removal rate

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Bayer red mud, a byproduct of alumina production, presents a significant waste management challenge in China, with over 1.1 billion tons accumulated.
  • The high sodium content in red mud limits its comprehensive utilization, necessitating effective sodium removal techniques.

Purpose of the Study:

  • To investigate novel methods for sodium removal from Bayer red mud.
  • To evaluate the efficacy of slurry electrolysis combined with different leaching agents for red mud desalination.

Main Methods:

  • A combined traditional red mud desalination and slurry electrolysis process was employed.
  • The influence of three leaching agents (CaO, CaCl2, HCl) on sodium removal under an electric field was analyzed.

Main Results:

  • Slurry electrolysis experiments demonstrated varying sodium removal rates: CaO > CaCl2 > HCl.
  • Hydrochloric acid (HCl) as a leaching agent yielded the highest sodium removal rate of 93.11%.

Conclusions:

  • A pre-slurry-electrolysis cycle process utilizing HCl as a circulating leaching agent was proposed.
  • This optimized process offers a cost-effective and efficient solution for sodium removal from Bayer red mud.