ORCID Profile
0000-0002-1779-8587
Current Organisation
Deakin University
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Mineral Processing/Beneficiation | Resources Engineering and Extractive Metallurgy
Concentrating Processes of Base Metal Ores (excl. Aluminium and Iron Ores) | First Stage Treatment of Ores and Minerals not elsewhere classified |
Publisher: Elsevier BV
Date: 06-2017
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 09-2012
Publisher: Elsevier BV
Date: 10-2023
Publisher: Wiley
Date: 05-2017
DOI: 10.1111/EMR.12264
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 05-2012
Publisher: Elsevier BV
Date: 03-2018
Publisher: American Chemical Society (ACS)
Date: 09-05-2023
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 09-2013
Publisher: Elsevier BV
Date: 2017
DOI: 10.1016/J.JENVMAN.2016.06.062
Abstract: Iron monosulfides are the initial iron sulfide minerals that form under reducing conditions in organic-rich sediments. Frequently referred as monosulfidic black ooze (MBO), these sediments exists in a range of anoxic systems including estuaries, coastal wetlands and permeable reactive barriers. The objective of this study was to investigate the transformation of solid phase sulfur, iron fractions and trace metals mobilisation in organic-rich hypersulfidic sediments during dredging. Two sediments from geographically contrasting sites in the Peel-Harvey Estuary were collected and subjected to oxidation through resuspension over 14 days. During oxidation, redox potential rapidly and continuously increased, although minimal change in pH was observed in both sediments. The majority of FeS was oxidised within 48 h. Although not as dynamic as FeS, unusually high rates of FeS
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 11-2011
Publisher: American Chemical Society (ACS)
Date: 18-10-2023
Publisher: American Chemical Society (ACS)
Date: 22-07-2016
Abstract: Fires in iron-rich seasonal wetlands can thermally transform Fe(III) minerals and alter their crystallinity. However, the fate of As associated with thermally transformed Fe(III) minerals is unclear, as are the consequences for As mobilization during subsequent reflooding and reductive cycles. Here, we subject As(V)-coprecipitated schwertmannite to thermal transformation (200, 400, 600 and 800 °C) followed by biotic reductive incubation (150 d) and examine aqueous- and solid-phase speciation of As, Fe and S. Heating to >400 °C caused transformation of schwertmannite to a nanocrystalline hematite with greater surface area and smaller particle size. Higher temperatures also caused the initially structurally incorporated As to become progressively more exchangeable, increasing surface-complexed As (AsEx) by up to 60-fold, thereby triggering enhanced As mobilization during incubation (∼70-fold in the 800 °C treatment). Although more As was mobilized in biotic treatments than controls (∼3-20×), in both cases it was directly proportional to initial AsEx and mainly due to abiotic desorption. Higher transformation temperatures also drove ergent pathways of Fe and S biomineralization and led to more As(V) and SO4 reduction relative to Fe(III) reduction. This study reveals thermal transformation of schwertmannite can greatly increase As mobility and has major consequences for As/Fe/S speciation under reducing conditions. Further research is warranted to unravel the wider implications for water quality in natural wetlands.
Publisher: Elsevier BV
Date: 06-2018
DOI: 10.1016/J.CHEMOSPHERE.2018.01.164
Abstract: The increased use of estuarine waters for commercial and recreational activities is one consequence of urbanisation. Western Australia's Peel-Harvey Estuary highlights the impacts of urbanisation, with a rapidly developing boating industry and periodic dredging activity. The aim of this research is to evaluate the potential mobility of nutrients and trace elements during dredging, and the influence of flocculation on iron and sulfur partitioning in iron monosulfide enriched sediments. Our findings indicate a short-term increase in nitrate, phosphate and ammonium, during dredging through the resuspension of sediments. However, no increase in metal mobilisation during dredging was observed except copper (Cu) and zinc (Zn). Flocculant addition increased the release of nutrients, zinc (Zn) and arsenic (As) from sediments, had no effect on acid volatile sulfides and pyritic sulfur, but corresponded with an initial sharp rise in elemental sulfur concentrations. The run-off water from geofabric bags should be treated to decrease the concentrations of Zn and As to their background levels before releases into the estuary. Long-term impact of dredging on organic matter mineralisation and its subsequent effect on nutrients and trace elements dynamics needs further investigation.
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: Australia
Start Date: 2016
End Date: 2016
Funder: Bragg Institute
View Funded ActivityStart Date: 2015
End Date: 2015
Funder: Australian Institute of Nuclear Science and Engineering
View Funded ActivityStart Date: 2016
End Date: 2016
Funder: Bragg Institute
View Funded ActivityStart Date: 2015
End Date: 2015
Funder: Southern Cross University
View Funded ActivityStart Date: 2015
End Date: 2015
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2014
End Date: 2014
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2015
End Date: 2016
Funder: Australian Institute of Nuclear Science and Engineering
View Funded ActivityStart Date: 2015
End Date: 2015
Funder: Bragg Institute
View Funded ActivityStart Date: 2012
End Date: 2012
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2012
End Date: 2012
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2013
End Date: 2013
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2012
End Date: 2012
Funder: Australian Synchrotron
View Funded ActivityStart Date: 2012
End Date: 2012
Funder: Bragg Institute
View Funded ActivityStart Date: 07-2020
End Date: 07-2027
Amount: $35,000,000.00
Funder: Australian Research Council
View Funded Activity