Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33872
Title: Nickel and zinc removal from acid mine drainage : roles of sludge surface area and neutralising agents
Authors: Olds, WE
Tsang, DC 
Weber, PA
Weisener, CG
Issue Date: 2013
Source: Journal of mining, 2013, v. 2013, p. 1-5 How to cite?
Journal: Journal of mining 
Abstract: During acid mine drainage (AMD) treatment by alkaline reagent neutralisation, Ni and Zn are partially removed via sorption to Fe and Al hydroxide precipitates. This research evaluated the effect of surface area of precipitates, formed by neutralisation of AMD using three alkalinity reagents (NaOH, Ca(OH)2, and CaCO3), on the sorption of Ni and Zn. The BET surface area of the precipitates formed by neutralisation of AMD with NaOH (173.7 m2 g−1) and Ca(OH)2 (168.2 m2 g−1) was an order of magnitude greater than that produced by CaCO3 neutralisation (16.7 m2 g−1). At pH 6.5, the residual Ni concentration was 0.32 and 0.41 mg L−1 for NaOH and Ca(OH)2 neutralised AMD, respectively, resulting in up to 60% lower Ni concentrations than achieved by CaCO3 neutralisation which had no effect on Ni removal. The residual Zn concentration was even more dependent on precipitate surface area for NaOH and Ca(OH)2 neutralised AMD (0.33 and 1.02 mg L−1), which was up to 85% lower than the CaCO3 neutralised AMD (2.20 mg L−1). These results suggest that the surface area of precipitated flocs and the selection of neutralising reagent critically affect the sorption of Ni and Zn during AMD neutralisation.
URI: http://hdl.handle.net/10397/33872
ISSN: 2314-6532(electronic)
DOI: 10.1155/2013/698031
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