Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 172, Issue 2-3, Pages 1629-1634Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.08.036
Keywords
Red mud; Alumina; Sodium oxide; Mild hydro-chemical process
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Funding
- National Key Basic Research Program of China [2007CB613501]
- National Key Technologies RD Program [2006BAC02A05]
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A mild hydro-chemical process to extract Al2O3 in red mud to produce sodium aluminate hydrate was investigated, and the optimum conditions of Al2O3 extraction were verified by experiments as leaching in 45% NaOH solution with CaO-to-red mud mass ratio of 0.25 and liquid-to-solid ratio of 0.9. under 0.8 MPa at 200 degrees C for 3.5 h. Subsequent process of extracting Na2O from the residue of Al2O3 extraction was carried out in 7% NaOH solution with liquid-to-solid ratio of 3.8 under 0.9 MPa at 170 degrees C for 2 h. Overall, 87.8% of Al2O3 and 96.4% of Na2O were extracted from red mud. The final residues with less than 1% Na2O could be utilized as feedstock in construction materials. The chemical reactions taking place in both Al2O3 and Na2O extractions from red mud are proposed. (C) 2009 Elsevier B.V. All rights reserved.
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