Carbon Sequestration Kinetic and Storage Capacity of Ultramafic Mining Waste

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• 作者：Julie Pronost ; Georges Beaudoin ; Joniel Tremblay ; Fa茂莽al Larachi ; Jos茅e Duchesne ; R茅jean H茅bert ; Marc Constantin
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：November 1, 2011
• 年：2011
• 卷：45
• 期：21
• 页码：9413-9420
• 全文大小：1008K
• 年卷期：v.45,no.21(November 1, 2011)
• ISSN：1520-5851

文摘

Mineral carbonation of ultramafic rocks provides an environmentally safe and permanent solution for CO₂ sequestration. In order to assess the carbonation potential of ultramafic waste material produced by industrial processing, we designed a laboratory-scale method, using a modified eudiometer, to measure continuous CO₂ consumption in samples at atmospheric pressure and near ambient temperature. The eudiometer allows monitoring the CO₂ partial pressure during mineral carbonation reactions. The maximum amount of carbonation and the reaction rate of different samples were measured in a range of experimental conditions: humidity from dry to submerged, temperatures of 21 and 33 掳C, and the proportion of CO₂ in the air from 4.4 to 33.6 mol %. The most reactive samples contained ca. 8 wt % CO₂ after carbonation. The modal proportion of brucite in the mining residue is the main parameter determining maximum storage capacity of CO₂. The reaction rate depends primarily on the proportion of CO₂ in the gas mixture and secondarily on parameters controlling the diffusion of CO₂ in the sample, such as relative saturation of water in pore space. Nesquehonite was the dominant carbonate for reactions at 21 掳C, whereas dypingite was most common at 33 掳C.