Hydrotalcite formation for contaminant removal from ranger mine process water

Douglas, G. B., Wendling, L. A., Pleysier, R. and Trefry, M. G. (2010) Hydrotalcite formation for contaminant removal from ranger mine process water. Mine Water and the Environment, 29 2: 108-115. doi:10.1007/s10230-010-0106-4


Author Douglas, G. B.
Wendling, L. A.
Pleysier, R.
Trefry, M. G.
Title Hydrotalcite formation for contaminant removal from ranger mine process water
Journal name Mine Water and the Environment   Check publisher's open access policy
ISSN 1025-9112
1616-1068
Publication date 2010-06
Sub-type Article (original research)
DOI 10.1007/s10230-010-0106-4
Volume 29
Issue 2
Start page 108
End page 115
Total pages 8
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Formatted abstract
Process water from the Ranger Uranium Mine requires treatment to meet stringent environmental water quality criteria. The acidic water contains substantial SO4, metals, and U. One novel treatment method under consideration is the use of Na-aluminate to both neutralise the process water and precipitate hydrotalcites. Hydrotalcites are a class of Mg–Al layered double hydroxide minerals with a typical endmember chemical composition: Mg6Al2(A)(OH)16·n(H2O), where A = CO3 2−, SO4 2−, etc. Many acidic wastewaters contain Mg and/or Al in sufficient abundance for hydrotalcite formation upon addition of alkali to achieve solution pH > 5, and Mg and/or Al to attain a Mg:Al ratio of 2 to 3:1. The utility of hydrotalcites lies in their ability to incorporate a range of cationic (Cu2+, UO2 2+), metalloid (AsO4 3−), and (oxy)anionic contaminants (CrO4 2−). The broad spectrum removal of contaminants, including U, also indicates that hydrotalcites and their derivatives could potentially be used as a containment material in nuclear waste repositories. In this study, Ranger process water derived from extraction of U from chloritic schist was treated with Na-aluminate sourced from Bayer process liquor, in combination with NaOH or Ca(OH)2. Hydrotalcites formed as the primary mineral during process water neutralisation with the ability to simultaneously remove a suite of contaminants from solution.
Keyword Hydrotalcite
Uranium
Wastewater
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Fri, 31 Jan 2014, 17:38:49 EST by Laura Wendling on behalf of School of Agriculture and Food Sciences