Passive remediation of acid mine drainage using cryptocrystalline magnesite: A batch experimental and geochemical modelling approach

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dc.citation.doi10.4314/wsa.v41i5.10en_ZA
dc.citation.epage682en_ZA
dc.citation.issue5en_ZA
dc.citation.spage677en_ZA
dc.contributor.authorMasindi, V.
dc.contributor.authorGitari, M.W.
dc.contributor.authorTutu, H.
dc.contributor.authorDe Beer, M.
dc.date.accessioned2016-11-18T14:09:36Z
dc.date.available2016-11-18T14:09:36Z
dc.date.issued2015-10
dc.description.abstractAcid mine drainage is generated when mining activities expose sulphidic rock to water and oxygen leading to generation of sulphuric acid effluents rich in Fe, Al, SO4 and Mn with minor concentrations of Zn, Cu, Mg, Ca, Pb depending on the geology of the rock hosting the minerals. These effluents must be collected and treated before release into surface water bodies. Mining companies are in constant search for cheaper, effective and efficient mine water treatment technologies. This study assessed the potential of applying magnesite as an initial remediation step in an integrated acid mine drainage (AMD) management system. Neutralization and metal attenuation was evaluated using batch laboratory experiments and simulations using geochemical modelling. Contact of AMD with cryptocrystalline magnesite for 60 min at 1 g: 100 mℓ S/L ratio led to an increase in pH, and a significant increase in metals attenuation. Sulphate concentration was reduced to ≈1 910 mg/ℓ. PH redox equilibrium (in C language) (PHREEQC) geochemical modelling results showed that metals precipitated out of solution to form complex mineral phases of oxy-hydroxysulphates, hydroxides, gypsum and dolomite. The results of this study showed that magnesite has potential to neutralize AMD, leading to the reduction of sulphate and precipitation of metals.en_ZA
dc.description.librarianSP2016en_ZA
dc.identifier.citationMasindi, V. et al. 2015. Passive remediation of acid mine drainage using cryptocrystalline magnesite: A batch experimental and geochemical modelling approach. Water SA 41(5), pp.677-682.en_ZA
dc.identifier.issn0378-4738 (Print)
dc.identifier.issn1816-7950 (Online)
dc.identifier.urihttp://hdl.handle.net/10539/21456
dc.journal.titleWater SAen_ZA
dc.journal.volume41en_ZA
dc.language.isoenen_ZA
dc.publisherSouth African Water Research Commissionen_ZA
dc.rightsPublished under a Creative Commons Attribution Licenceen_ZA
dc.subjectAcid mine drainageen_ZA
dc.subjectCryptocrystalline magnesiteen_ZA
dc.subjectGeochemical modellingen_ZA
dc.subjectToxic metalsen_ZA
dc.subjectWater treatmenten_ZA
dc.titlePassive remediation of acid mine drainage using cryptocrystalline magnesite: A batch experimental and geochemical modelling approachen_ZA
dc.typeArticleen_ZA
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