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Open AccessArticle

Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process

Department of Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
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Minerals 2020, 10(12), 1091; https://doi.org/10.3390/min10121091
Received: 15 November 2020 / Revised: 1 December 2020 / Accepted: 3 December 2020 / Published: 5 December 2020
(This article belongs to the Special Issue Emerging Insights into Serpentinites)
The aim of this study was to increase feedstock availability for mineral carbonation. Acid dissolution and carbonic acid dissolution approaches were used to achieve higher Mg extractions from peridotites. Acid dissolution studies of raw dunite, heat-activated dunite, heat-transformed dunite, and twin sister dunite have not been reported in the literature. Heat-activated dunite is more reactive as compared to heat-transformed dunite, raw dunite, and twin sister dunite. The fraction of magnesium extracted from heat-activated dunite was 57% as compared to 18% from heat-transformed dunite, 14% from raw dunite, and 11% from twin sister dunite. Similarly, silicon and iron extractions were higher for heat-activated dunite compared to that of heat-transformed dunite, raw dunite, and twin sister dunite. Materials rich in forsterite (twin sister dunite and heat-transformed dunite) showed preferential Mg release and exhibited incongruent dissolution similar to that of forsterite. Heat-activated dunite (amorphous magnesium silicate rich) on the other hand behaved differently and showed congruent dissolution. Olivine did not dissolve under carbonic acid dissolution (with concurrent grinding) and acidic conditions. Under carbonic acid dissolution with concurrent grinding conditions, olivine was partially converted into nanometer sized particles (d10 = 0.08 µm) but still provided 16% Mg extraction during 4 h of dissolution. View Full-Text
Keywords: acid dissolution; dunite rock; olivine; carbonic acid dissolution; peridotites acid dissolution; dunite rock; olivine; carbonic acid dissolution; peridotites
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MDPI and ACS Style

Rashid, M.I.; Benhelal, E.; Farhang, F.; Stockenhuber, M.; Kennedy, E.M. Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process. Minerals 2020, 10, 1091. https://doi.org/10.3390/min10121091

AMA Style

Rashid MI, Benhelal E, Farhang F, Stockenhuber M, Kennedy EM. Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process. Minerals. 2020; 10(12):1091. https://doi.org/10.3390/min10121091

Chicago/Turabian Style

Rashid, Muhammad I.; Benhelal, Emad; Farhang, Faezeh; Stockenhuber, Michael; Kennedy, Eric M. 2020. "Magnesium Leachability of Mg-Silicate Peridotites: The Effect on Magnesite Yield of a Mineral Carbonation Process" Minerals 10, no. 12: 1091. https://doi.org/10.3390/min10121091

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