Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach

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dc.contributor.authorMadzivire, Godfrey
dc.contributor.authorGitari, Wilson
dc.contributor.authorVadapalli, V.R. Kumar.
dc.contributor.authorOjumu, Tunde V.
dc.contributor.authorPetrik, Leslie
dc.date.accessioned2013-10-16T14:07:16Z
dc.date.available2013-10-16T14:07:16Z
dc.date.issued2011
dc.description.abstractThe treatment of acid mine drainage (AMD) and circumneutral mine water (CMW) with South African coal fly ash (FA) provides a low cost and alternative technique for treating mine wastes waters. The sulphate concentration in AMD can be reduced significantly when AMD was treated with the FA to pH 9. On the other hand an insignificant amount of sulphate was removed when CMW (containing a very low concentration of Fe and Al) was treated using FA to pH 9. The levels of Fe and Al, and the final solution pH in the AMD–fly ash mixture played a significant role on the level of sulphate removal in contrast to CMW–fly ash mixtures. In this study, a modelling approach using PHREEQC geochemical modelling software was combined with AMD–fly ash and/or CMW–fly ash neutralization experiments in order to predict the mineral phases involved in sulphate removal. The effects of solution pH and Fe and Al concentration in mine water on sulphate were also investigated. The results obtained showed that sulphate, Fe, Al, Mg and Mn removal from AMD and/or CMW with fly ash is a function of solution pH. The presence of Fe and Al in AMD exhibited buffering characteristic leading to more lime leaching from FA into mine water, hence increasing the concentration of Ca2+. This resulted in increased removal of sulphate as CaSO4·2H2O. In addition the sulphate removal was enhanced through the precipitation as Fe and Al oxyhydroxysulphates (as shown by geochemical modelling) in AMD–fly ash system. The low concentration of Fe and Al in CMW resulted in sulphate removal depending mainly on CaSO4·2H2O. The results of this study would have implications on the design of treatment methods relevant for different mine waters.en_US
dc.description.accreditationWeb of Scienceen_US
dc.identifier.citationMadzivire, G., et al. (2011). Fate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approach. Minerals Engineering 24 (13): 1467–1477en_US
dc.identifier.issn0892-6875
dc.identifier.urihttp://hdl.handle.net/10566/763
dc.language.isoenen_US
dc.privacy.showsubmitterfalse
dc.publisherElsevieren_US
dc.rightsThis is the author postprint version of an article by Elsevier. The file may be freely used, provided that acknowledgement of the source is given.
dc.source.urihttp://dx.doi.org/10.1016/j.mineng.2011.07.009
dc.status.ispeerreviewedtrue
dc.subjectFly ashen_US
dc.subjectCircumneutral mine wateren_US
dc.subjectAcid mine drainageen_US
dc.subjectPHREEQC geochemical modellingen_US
dc.subjectsulphatesen_US
dc.titleFate of sulphate removed during the treatment of circumneutral mine water and acid mine drainage with coal fly ash: Modelling and experimental approachen_US
dc.typeArticleen_US

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