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On the Mechanism of Sodic Removal from Bauxite Residue and Bauxite Desilication Products (BDP) Using Acetic Acid

  • Sicheng Wang
  • Tuan Nguyen
  • Hong Peng
  • Longbin HuangEmail author
Bauxite to Aluminum: Advances, Automation, and Alternative Processes
  • 46 Downloads

Abstract

Bauxite desilication products (BDPs) are fundamental causes of persistent alkalinity and salinity in bauxite residue. Previous studies have shown that significant amounts of acetic acid and Na+ were detected in the pore water of organic matter-amended and bacteria-regulated bauxite residue, implying the capability of acetic acid to alleviate the long-term residual alkalinity and salinity of bauxite residue. The present study aims to establish a fundamental understanding of the bauxite residue/BDP weathering mechanism using acetic acid as a case model of microbial-derived low-molecular-weight soluble organics. Large amounts of Na+ were released into the solution in treated bauxite residue, implying enhanced desalination of bauxite residue/BDP by acetic acid. Attenuated total reflectance—Fourier transform infrared spectroscopy, Raman spectroscopy, and nuclear magnetic resonance spectroscopy indicated the adsorption of acetate on the surface of BDP, which caused slight deformation of BDP’s cages and thus made encaged Na+ exchange easily with other cations. This mechanism of organic acid-mediated Na+ exchange may provide the key to unlocking the barrier of alkaline mineral weathering and subsequent development of soil-like properties for sustainable plant colonization.

Notes

Acknowledgements

SW thanks David Appleton and Ekaterina Strounina for bauxite residue and BDP sample analysis and Lachlan Robertson for helpful discussion. SW gratefully acknowledges the University of Queensland for the UQ-RTP and UQ Graduate School scholarships.

Supplementary material

11837_2019_3884_MOESM1_ESM.docx (1.1 mb)
Supplementary material 1 (DOCX 1123 kb)

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Sicheng Wang
    • 1
  • Tuan Nguyen
    • 1
  • Hong Peng
    • 2
  • Longbin Huang
    • 1
    Email author
  1. 1.Centre for Mined Land Rehabilitation, Sustainable Minerals InstituteThe University of QueenslandBrisbaneAustralia
  2. 2.School of Chemical EngineeringThe University of QueenslandBrisbaneAustralia

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