Mark Pownceby | CSIRO - Academia.edu (original) (raw)
Papers by Mark Pownceby
Minerals, May 26, 2023
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Isij International, Apr 15, 2022
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Powder Diffraction, Oct 26, 2017
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Mineral Processing and Extractive Metallurgy Review, Aug 28, 2022
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Journal of Hazardous Materials, Feb 1, 2021
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Journal of the American Ceramic Society, Apr 20, 2017
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Materials Chemistry and Physics, Dec 1, 2020
Abstract This study aims to explore the feasibility of using waste red clay from a sedimentary, i... more Abstract This study aims to explore the feasibility of using waste red clay from a sedimentary, interlayered phosphate deposit to produce a geopolymer mortar without any pre-treatment. Alkali activated mortars were prepared by mixing fly ash or slag with red clay and sand, using different fly ash or slag/red clay ratios. The effects of sodium silicate to sodium hydroxide ratio (SS/SH) and curing time on the mortar's properties were studied. The results showed that compared to fly ash-based alkali activated materials, an increase of the slag content resulted in the formation of dense mortars while in the case of fly ash based-samples more porous mortars were formed when the fly ash amount was increased. The mineralogical investigations indicated a partial contribution of montmorillonite and palygorskite from the clay to the alkali activation reaction. The mechanical properties of the materials were promising with a maximum compressive strength of up to 39 MPa obtained for the mixture of fly ash and red clay at a fly ash/red clay ratio of 2 and a SS/SH of 1.
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Mineral Processing and Extractive Metallurgy, Jul 2, 2016
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Minerals Engineering, Dec 1, 2012
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Isij International, 2016
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Mineral processing and extractive metallurgy, Feb 28, 2022
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Minerals Engineering, Jun 1, 2019
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JOM, Nov 16, 2020
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Mineral Processing and Extractive Metallurgy, Aug 31, 2015
Mineral sand deposits in the Murray Basin offer the potential for significantly expanding Austral... more Mineral sand deposits in the Murray Basin offer the potential for significantly expanding Australia's production of ilmenite, rutile and zircon. Since prices of zircon and rutile are higher than ilmenite, and zircon grades in most deposits are significantly higher than those for rutile, zircon often is the major economic mineral component in mineral sand deposits. Two types of deposits occur in the Murray Basin. They comprise strandline deposits, in which the particle size of the heavy minerals is similar to that in other Australian deposits, and fine grained, sheet-like, WIM style, deposits. While production from several strandline deposits has commenced, the fine grained deposits, which contain significantly greater amounts of mineralisation, are still to be developed. Problems with processing the finer particle size of the mineralisation, its variable mineralogy, higher surface and lattice impurity levels, in particular uranium and thorium in zircon grains, have contributed to this. Overcoming these problems is necessary to obtain the full commercial value from the Murray Basin deposits. Processing to recover a fine grained zircon concentrate from the extensive WIM style deposits and the removal of impurities in the concentrate are discussed in this paper. In particular, treatments to remove surface and lattice impurities, and to lower uranium and thorium levels by an acid leach and with heat and leach treatments, are reviewed. The conditions used in the heating treatment (e.g. temperature and nature of any fluxes added) affect the impurity removal and whether zirconia (ZrO2) or zircon (ZrSiO4) is obtained as the product.
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Ore Geology Reviews, 2019
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Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, Jun 30, 2016
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Contributions to Mineralogy and Petrology, 1994
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Chemie der Erde, Sep 1, 2022
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Minerals, May 26, 2023
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Isij International, Apr 15, 2022
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Powder Diffraction, Oct 26, 2017
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Mineral Processing and Extractive Metallurgy Review, Aug 28, 2022
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Journal of Hazardous Materials, Feb 1, 2021
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Journal of the American Ceramic Society, Apr 20, 2017
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Materials Chemistry and Physics, Dec 1, 2020
Abstract This study aims to explore the feasibility of using waste red clay from a sedimentary, i... more Abstract This study aims to explore the feasibility of using waste red clay from a sedimentary, interlayered phosphate deposit to produce a geopolymer mortar without any pre-treatment. Alkali activated mortars were prepared by mixing fly ash or slag with red clay and sand, using different fly ash or slag/red clay ratios. The effects of sodium silicate to sodium hydroxide ratio (SS/SH) and curing time on the mortar's properties were studied. The results showed that compared to fly ash-based alkali activated materials, an increase of the slag content resulted in the formation of dense mortars while in the case of fly ash based-samples more porous mortars were formed when the fly ash amount was increased. The mineralogical investigations indicated a partial contribution of montmorillonite and palygorskite from the clay to the alkali activation reaction. The mechanical properties of the materials were promising with a maximum compressive strength of up to 39 MPa obtained for the mixture of fly ash and red clay at a fly ash/red clay ratio of 2 and a SS/SH of 1.
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Mineral Processing and Extractive Metallurgy, Jul 2, 2016
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Minerals Engineering, Dec 1, 2012
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Isij International, 2016
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Mineral processing and extractive metallurgy, Feb 28, 2022
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Minerals Engineering, Jun 1, 2019
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JOM, Nov 16, 2020
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Mineral Processing and Extractive Metallurgy, Aug 31, 2015
Mineral sand deposits in the Murray Basin offer the potential for significantly expanding Austral... more Mineral sand deposits in the Murray Basin offer the potential for significantly expanding Australia's production of ilmenite, rutile and zircon. Since prices of zircon and rutile are higher than ilmenite, and zircon grades in most deposits are significantly higher than those for rutile, zircon often is the major economic mineral component in mineral sand deposits. Two types of deposits occur in the Murray Basin. They comprise strandline deposits, in which the particle size of the heavy minerals is similar to that in other Australian deposits, and fine grained, sheet-like, WIM style, deposits. While production from several strandline deposits has commenced, the fine grained deposits, which contain significantly greater amounts of mineralisation, are still to be developed. Problems with processing the finer particle size of the mineralisation, its variable mineralogy, higher surface and lattice impurity levels, in particular uranium and thorium in zircon grains, have contributed to this. Overcoming these problems is necessary to obtain the full commercial value from the Murray Basin deposits. Processing to recover a fine grained zircon concentrate from the extensive WIM style deposits and the removal of impurities in the concentrate are discussed in this paper. In particular, treatments to remove surface and lattice impurities, and to lower uranium and thorium levels by an acid leach and with heat and leach treatments, are reviewed. The conditions used in the heating treatment (e.g. temperature and nature of any fluxes added) affect the impurity removal and whether zirconia (ZrO2) or zircon (ZrSiO4) is obtained as the product.
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Ore Geology Reviews, 2019
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Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, Jun 30, 2016
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Contributions to Mineralogy and Petrology, 1994
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Chemie der Erde, Sep 1, 2022
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