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Minerals 2017, 7(11), 207;

CO2 Mineralization Using Brine Discharged from a Seawater Desalination Plant

Change Mitigation and Sustainability Division, Korea Institute of Geoscience and Mineral Resources (KIGAM), 124 Gwahang-no, Yuseong-gu, Daejeon 34132, Korea
Author to whom correspondence should be addressed.
Received: 12 September 2017 / Revised: 16 October 2017 / Accepted: 27 October 2017 / Published: 30 October 2017
(This article belongs to the Special Issue Carbon Capture and Storage via Mineral Carbonation)
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CO2 mineralization is a method of sequestering CO2 in the form of carbonated minerals. Brine discharged from seawater desalination is a potential source of Mg and Ca, which can precipitate CO2 as forms of their carbonate minerals. The concentration of Mg and Ca in brine are twice those in the seawater influent to desalination process. This study used a cycle for CO2 mineralization that involves an increase in the pH of the brine, followed by CO2 bubbling, and, finally, filtration. To the best of our knowledge, this is the first time that non-synthesized brine from a seawater desalination plant has been used for CO2 mineralization. The resulting precipitates were CaCO3 (calcite), Mg5(CO3)4(OH)2·4H2O (hydromagnesite), and NaCl (halite) with these materials being identified by X-ray Diffraction (XRD), Fourier transform infrared (FTIR) and thermo gravimetric-differentail thermal Analysis (TGA)-DTA. Despite the presence of Ca with Mg in brine being unfavorable for the precipitation of Mg carbonate, Mg reacted with CO2 to form hydromagnesite at a yield of 86%. Most of the Ca formed calcite, at 99% yield. This study empirically demonstrates that brine from seawater desalination plants can be used for CO2 mineralization. View Full-Text
Keywords: CO2 mineralization; desalination; carbonates; brine; seawater CO2 mineralization; desalination; carbonates; brine; seawater

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Bang, J.-H.; Yoo, Y.; Lee, S.-W.; Song, K.; Chae, S. CO2 Mineralization Using Brine Discharged from a Seawater Desalination Plant. Minerals 2017, 7, 207.

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