Journal
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
Volume 55, Issue -, Pages 73-81Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2016.11.006
Keywords
Nesquehonite; Mineral carbonation; Carbon sequestration; Trace metals; Mg carbonate minerals; Enhanced weathering; X-ray fluorescence microscopy
Categories
Funding
- Carbon Management Canada
- NSW Department of Industry
- Multi-modal Australian ScienceS Imaging and Visualisation Environment (MASSIVE)
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Acid leaching of ultramafic rocks to produce Mg2+- and Ca2+-rich solutions for mineral carbonation may inadvertently leach toxic trace metals. This study investigates the capacity of nesquehonite (MgCO3 center dot 3H(2)O), a common product of mineral carbonation at Earth's surface conditions, to sorb Cr, Ni, Mn, Co and Cu from solution. Our results demonstrate that upon precipitation, nesquehonite rapidly sequesters transition metals present in solution at concentrations from 10 to 100 mg/L. Trace metal uptake appears to occur by substitution for Mg2+ in the nesquehonite crystal structure, and also by incorporation into minor, metal-rich phases, such as Fe-oxyhydroxides. This indicates that first row transition metals will likely be trapped and stored within Mg-carbonate minerals produced in industrial mineral carbonation reactors and in landscapes modified to capture atmospheric CO2 via enhanced weathering. Thus, it is unlikely that trace metals will pose an environmental risk in the event of accidental release of wastewater. (C) 2016 Elsevier Ltd. All rights reserved.
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