Regrowth of arsenate–sulfate efflorescences on processing plant walls at the Ottery arsenic–tin mine, New South Wales, Australia: Implications for arsenic mobility and remediation of mineral processing sites

Hebbard, Emily R.; Wilson, Siobhan A.; Jowitt, Simon M.; Tait, Alastair W.; Turvey, Connor C.; Wilson, Harriet L.

doi:10.1016/j.apgeochem.2017.01.015

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…This study examines AMD at the Ottery Mine, a former As–Sn mine in eastern Australia (29°24′30″S; 151°39′39″E) that operated from 1882 to 1936 and again in 1956/57 . During this time, ∼110,000 T of ore was recovered, with the As-rich ore being processed on-site via calcination.…”

Section: Methodsmentioning

confidence: 99%

Iron Isotopes in Acid Mine Drainage: Extreme and Divergent Fractionation between Solid (Schwertmannite, Jarosite, and Ferric Arsenate) and Aqueous Species

Burton

Karimian

Hamilton

et al. 2022

Environ. Sci. Technol.

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Examination of stable Fe isotopes is a powerful tool to explore Fe cycling in a range of environments. However, the isotopic fractionation of Fe in acid mine drainage (AMD) has received little attention and is poorly understood. Here, we analyze Fe isotopes in waters and Fe(III)-rich solids along an AMD flow-path. Aqueous Fe spanned a concentration and δ 56 Fe range of ∼420 mg L −1 and + 0.04‰ at the AMD source to ∼100 mg L −1 and −0.81‰ at ∼450 m downstream. Aqueous As (up to ∼33 mg L −1 ) and SO 4 2− (up to ∼2000 mg L −1 ), like aqueous Fe, decreased in concentration down the flow-path. X-ray absorption spectroscopy indicated that downstream attenuation in aqueous Fe, As, and SO 4 2− was due to the precipitation of amorphous ferric arsenate (AFA), schwertmannite, and jarosite. The Fe(III) in these solids displayed extreme variability in δ 56 Fe, spanning +3.95‰ in AFA near the AMD source to −1.34‰ in schwertmannite at ∼450 m downstream. Similarly, the isotopic contrast between solid Fe(III) precipitates and aqueous Fe (Δ 56 Fe ppt-aq ) dropped along the flow-path from about +4.1 to −1.1‰. The shift from positive to negative Δ 56 Fe ppt-aq reflects divergence between competing equilibrium versus kinetic fractionation processes.

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Section: Methodsmentioning

confidence: 99%

Iron Isotopes in Acid Mine Drainage: Extreme and Divergent Fractionation between Solid (Schwertmannite, Jarosite, and Ferric Arsenate) and Aqueous Species

Burton

Karimian

Hamilton

et al. 2022

Environ. Sci. Technol.

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“…Indeed, arsenic has been shown to be abundant at mine sites and in contaminated soil profiles (e.g. Hebbard et al , 2017; Rahman et al ., 2017; Drahota et al , 2018; Akopyan et al ., 2018; Gamble et al ., 2018; Cui et al ., 2018), or in aquifers and rivers (e.g. Bozau et al ., 2017; Shen et al ., 2018; Bhowmick et al ., 2018).…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of mansfieldite (AlAsO₄·2H₂O), angelellite (Fe₄(AsO₄)₂O₃) and kamarizaite (Fe₃(AsO₄)₂(OH)₃·3H₂O)

et al. 2018

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Thermodynamic data for the arsenates of various metals are necessary to calculate their solubilities and to evaluate their potential as arsenic storage media. If some of the less common arsenate minerals have been shown to be less soluble than the currently used options for arsenic disposal (especially scorodite and arsenical iron oxides), they should be further investigated as promising storage media. Furthermore, the health risk associated with arsenic minerals is a function of their solubility and bioavailability, not merely their presence. For all these purposes, solubilities of such minerals need to be known. In this work, a complete set of thermodynamic data has been determined for mansfieldite, AlAsO4·2H2O; angelellite, Fe4(AsO4)2O3; and kamarizaite, Fe3(AsO4)2(OH)3·3H2O, using a combination of high-temperature oxide-melt calorimetry, relaxation calorimetry, solubility measurements, and estimates where possible and appropriate. Several choices for the reference compounds for As for the high-temperature oxide-melt calorimetry were assessed. Scorodite was selected as the best one. The calculated Gibbs free energy of formation (all data in kJ·mol–1) is –1733.4 ± 3.5 for mansfieldite, –2319.2 ± 7.9 for angelellite and –3056.8 ± 8.5 for kamarizaite. The solubility products for the dissolution reactions are –21.4 ± 0.5 for mansfieldite, –43.4 ± 1.5 for angelellite and –50.8 ± 1.6 for kamarizaite. Available, but limited, chemical data for the natural scorodite–mansfieldite solid-solution series hint at a miscibility gap; hence the non-ideal nature of the series. However, no mixing parameters were derived because more data are needed. The solubility of mansfieldite is several orders of magnitude higher than that of scorodite. The solubility of kamarizaite, on the other hand, is comparable to that of scorodite, and kamarizaite even has a small stability field in a pH-pε diagram. It is predicted to form under mildly acidic conditions in acid drainage systems that are not subject to rapid neutralization and sudden strong supersaturation. The solubility of angelellite is high, and the mineral is obviously restricted to unusual environments, such as fumaroles. Its crystallization may be enhanced via its epitaxial relationship with the much more common hematite. The use of the scorodite–mansfieldite solid solution for arsenic disposal, whether the solid solution is ideal or not, is not practical. The difference in solubility products of the two end-members (scorodite and mansfieldite) is so large that almost any system will drive the precipitation of essentially pure scorodite, leaving the aluminium in the aqueous phase.

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Geochemical cycles of arsenic in historic tin tailings from multiple ore sources: an example from Australia

Remigio

Rubinos

Ent

et al. 2021

Water Air Soil Pollut

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Regrowth of arsenate–sulfate efflorescences on processing plant walls at the Ottery arsenic–tin mine, New South Wales, Australia: Implications for arsenic mobility and remediation of mineral processing sites

Cited by 4 publications

References 26 publications

Iron Isotopes in Acid Mine Drainage: Extreme and Divergent Fractionation between Solid (Schwertmannite, Jarosite, and Ferric Arsenate) and Aqueous Species

Iron Isotopes in Acid Mine Drainage: Extreme and Divergent Fractionation between Solid (Schwertmannite, Jarosite, and Ferric Arsenate) and Aqueous Species

Thermodynamic properties of mansfieldite (AlAsO₄·2H₂O), angelellite (Fe₄(AsO₄)₂O₃) and kamarizaite (Fe₃(AsO₄)₂(OH)₃·3H₂O)

Geochemical cycles of arsenic in historic tin tailings from multiple ore sources: an example from Australia

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Regrowth of arsenate–sulfate efflorescences on processing plant walls at the Ottery arsenic–tin mine, New South Wales, Australia: Implications for arsenic mobility and remediation of mineral processing sites

Cited by 4 publications

References 26 publications

Iron Isotopes in Acid Mine Drainage: Extreme and Divergent Fractionation between Solid (Schwertmannite, Jarosite, and Ferric Arsenate) and Aqueous Species

Iron Isotopes in Acid Mine Drainage: Extreme and Divergent Fractionation between Solid (Schwertmannite, Jarosite, and Ferric Arsenate) and Aqueous Species

Thermodynamic properties of mansfieldite (AlAsO4·2H2O), angelellite (Fe4(AsO4)2O3) and kamarizaite (Fe3(AsO4)2(OH)3·3H2O)

Geochemical cycles of arsenic in historic tin tailings from multiple ore sources: an example from Australia

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Product

Resources

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Thermodynamic properties of mansfieldite (AlAsO₄·2H₂O), angelellite (Fe₄(AsO₄)₂O₃) and kamarizaite (Fe₃(AsO₄)₂(OH)₃·3H₂O)