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The fate of atmospheric carbon sequestrated through weathering in mine tailings
Minerals Engineering ( IF 4.9 ) Pub Date : 2021-01-11 , DOI: 10.1016/j.mineng.2020.106767
Reza Khalidy , Rafael M. Santos

Induced by fossil fuels combustion, GHGs emissions play a key role in the atmospheric CO2 level elevation. Accordingly, many mitigation strategies have been proposed to uptake atmospheric CO2. However, most of these methods demand industrial facilities, usually coming along with obstructive expenses. Residues produced from mining operations are among cheap and naturally occurring materials propounded for stable carbon sequestration through mineralization. Brucite and chrysotile are the major candidates for passive carbon mineralization in mining residues, belonging to magnesium hydroxide and magnesium silicates groups, respectively. This review paper critically explores available literature on mechanisms governing atmospheric CO2 capture in the mining residues, with an emphasis on the mine tailings. Firstly, the overall image of carbon mineralization in mineral residues is discussed in this paper. This entails the occurrence and the mechanisms governing the carbonation in the surface and deep layers of the mining residue piles. Secondly, factors that likely affect the mineralization are illustrated. Then, two tools, carbon isotopes and geochemical modeling, utilized for discriminating atmospheric CO2 and characterizing mineralization in the tailings are described, respectively. Finally, various conditions leading to different Mg-carbonates formation, carbonation rate estimations, and technologies proposed for enhancing carbonation in the mining residues are explored.



中文翻译:

矿山尾矿中的风化隔离了大气中碳的命运

由化石燃料燃烧引起的温室气体排放在大气CO 2水平升高中起关键作用。因此,已经提出了许多缓解策略来吸收大气中的CO 2。然而,这些方法大多数都需要工业设施,通常伴随着阻碍性支出。采矿作业产生的残渣属于廉价且天然存在的材料,可通过矿化来稳定碳固存。水镁石和温石棉是采矿残余物中被动碳矿化的主要候选物,分别属于氢氧化镁和硅酸镁族。这篇评论论文批判性地探索了有关控制大气中CO 2的机制的现有文献。捕集采矿残渣,重点放在矿山尾矿。首先,本文讨论了矿物残渣中碳矿化的总体情况。这就需要在采矿残渣堆的表层和深层中发生碳酸盐和控制碳化的机理。其次,说明了可能影响矿化的因素。然后,分别描述了用于区分大气中的CO 2和表征尾矿中矿化特征的两种工具,即碳同位素和地球化学模型。最后,探讨了导致镁碳酸盐形成不同的各种条件,碳酸化速率估算以及为提高采矿残余物中的碳酸化而提出的技术。

更新日期:2021-01-11
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