期刊
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
卷 25, 期 -, 页码 121-140出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijggc.2014.04.002
关键词
Carbon accounting; Carbon mineralization; Mount Keith Nickel Mine; Reactive transport modeling; Stable isotopes; Quantitative X-ray diffraction
类别
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- BHP Billiton through a Collaborative Research and Development Grant
- Carbon Management Canada National Centre of Excellence
- Discovery Grant
- Foundation Scholarship from the Mineralogical Association of Canada
- Alexander Graham Bell Canada Graduate Scholarship from NSERC
- Post-Graduate Scholarships from NSERC
- University of British Columbia Four-Year Fellowship
The hydrated Mg-carbonate mineral, hydromagnesite [Mg-5(CO3)(4)(OH)(2)center dot 4H(2)O], precipitates within mine tailings at the Mount Keith Nickel Mine, Western Australia as a direct result of mining operations. We have used quantitative mineralogical data and delta C-13, delta O-18 and (FC)-C-14 isotopic data to quantify the amount of CO2 fixation and identify carbon sources. Our radiocarbon results indicate that at least 80% of carbon stored in hydromagnesite has been captured from the modern atmosphere. Stable isotopic results indicate that dissolution of atmospheric CO2 into mine tailings water is kinetically limited, which suggests that the current rate of carbon mineralization could be accelerated. Reactive transport modeling is used to describe the observed variation in tailings mineralogy and to estimate rates of CO2 fixation. Based on our assessment, approximately 39,800 t/yr of atmospheric CO2 are being trapped and stored in tailings at Mount Keith. This represents an offsetting of approximately 11% of the mine's annual greenhouse gas emissions. Thus, passive sequestration via enhanced weathering of mineral waste can capture and store a significant amount of CO2. Recommendations are made for changes to tailings management and ore processing practices that have potential to accelerate carbonation of tailings and further reduce or completely offset the net greenhouse gas emissions at Mount Keith and many other mines. (C) 2014 Elsevier Ltd. All rights reserved.
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