Atmospheric CO2 Sequestration in Iron and Steel Slag: Consett, County Durham, United Kingdom.
Atmospheric CO2 Sequestration in Iron and Steel Slag: Consett, County Durham, United Kingdom.
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DOI：
10.1021/acs.est.8b01883
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发表时间：
2018-06
影响因子：
11.4
通讯作者：
William M. Mayes;A. Riley;Helena I Gomes;Peter Brabham;Joanna Hamlyn;H. Pullin;P. Renforth
中科院分区：
文献类型：
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作者：
William M. Mayes;A. Riley;Helena I Gomes;Peter Brabham;Joanna Hamlyn;H. Pullin;P. Renforth
钢铁工业废物中碳酸盐的形成可能会在全球以潜在的低成本从大气中消除二氧化碳的需求中占据相当大的比例。为了利用这一潜力，我们研究了英国英格兰北部一个2000万吨遗留矿渣矿床的大气二氧化碳封存情况。堆场排水形成的碳酸盐对δ13C和δ18O的碳氧同位素值分别在-12~-25‰和-5~-18‰之间，表明大气中的二氧化碳在高pH溶液中被固定。根据溶液饱和状态的分析，我们估计从排水中沉淀出的二氧化碳在280至2900吨之间。然而，通过将长达37年的排水水化学数据集与地理空间分析相结合，我们估计该矿床最大碳捕获潜力的1%可能已经实现。这意味着，不受控制的矿渣沉积不足以最大限度地实现碳固定，而且可能有相当数量的未反应遗留沉积物可用于大气碳固定。
Carbonate formation in waste from the steel industry could constitute a nontrivial proportion of the global requirements for removing carbon dioxide from the atmosphere at a potentially low cost. To utilize this potential, we examined atmospheric carbon dioxide sequestration in a >20 million ton legacy slag deposit in northern England, United Kingdom. Carbonates formed from the drainage water of the heap had stable carbon and oxygen isotope values between -12 and -25 ‰ and -5 and -18 ‰ for δ13C and δ18O, respectively, suggesting atmospheric carbon dioxide sequestration in high-pH solutions. From the analyses of solution saturation states, we estimate that between 280 and 2900 tons of CO2 have precipitated from the drainage waters. However, by combining a 37 year long data set of the drainage water chemistry with geospatial analysis, we estimate that <1% of the maximum carbon-capture potential of the deposit may have been realized. This implies that uncontrolled deposition of slag is insufficient to maximize carbon sequestration, and there may be considerable quantities of unreacted legacy deposits available for atmospheric carbon sequestration.