Neutralization of acid sulfate solutions using bauxite refinery residues and its derivatives

Couperthwaite, Sara J., Johnstone, Dean W., Millar, Graeme J., & Frost, Ray L. (2013) Neutralization of acid sulfate solutions using bauxite refinery residues and its derivatives. Industrial & Engineering Chemistry Research, 52(4), pp. 1388-1395.

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This investigation has shown that by transforming free caustic in red mud (RM) to Bayer hydrotalcite (during the seawater neutralization (SWN) process) enables a more controlled release mechanism for the neutralization of acid sulfate soils. The formation of hydrotalcite has been confirmed by X-ray diffraction (XRD) and differential thermalgravimetric analysis (DTG), while the dissolution of hydrotalcite and sodalite has been observed through XRD, DTG, pH plots, and ICP-OES. Coupling of all techniques enabled three neutralization mechanisms to be determined: (1) free alkali, (2) hydrotalcite dissolution, and (3) sodalite dissolution. The mechanisms are determined on the basis of ICP-OES and kinetic information. When the mass of RM or SWN-RM is greater than 0.08 g/50 mL, the pH of solution increases to a suitable value for plant life with aluminum leaching kept at a minimum. To obtain a neutralization pH greater than 6 in 10 min, the following ratio of bauxite residue (g) in 50 mL with a known iron sulfate (Fe2(SO4)3) concentration can be determined as follows: 0.04 g:50 mL:0.1 g/L of Fe2(SO4)3.

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ID Code: 58779
Item Type: Journal Article
Refereed: Yes
Keywords: acid sulphate soils, bauxite residue, hydrotalcite, remediation, red mud, seawater, sulphate-reduction
DOI: 10.1021/ie301618p
ISSN: 1520-5045
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 American Chemical Society
Deposited On: 04 Apr 2013 22:46
Last Modified: 02 Dec 2014 12:01

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