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Sequestering CO_2 by Mineral Carbonation: Stability against Acid Rain Exposure

机译：通过矿物碳酸化隔离CO_2：抵抗酸雨暴露的稳定性

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摘要

Mineral carbonation is a potentially attractive alternative to storage of compressed CO_2 in underground repositories, known as geosequestration. Processes for the conversion of basic ores, such as magnesium silicates, to carbonates have been proposed by various researchers, with storage of the carbonate as backfill in the original mine representing a solid carbon sink. The stability of such carbon sinks against acid rain and other sources of strong acids is examined here. It is acknowledged that in the presence of strong acid, carbonates will dissolve and release carbon dioxide. A sensitivity analysis covering annual average rainfall and pH that may be encountered in industrialized areas of the United States, China, Europe, and Australia was conducted to determine maximum CO_2 rerelease rates from mineral carbonation carbon sinks. This analysis is based on a worst-case premise that is equivalent to assuming infinitely rapid kinetics of dissolution of the carbonate. The analysis shows that under any likely conditions of pH and rainfall, leakage rates of stored CO_2 are negligible. This is illustrated in a hypothetical case study under Australian conditions. It is thus proposed that sequestration by mineral carbonation can be considered to be permanent on practical human time scales. Other possible sources of acid have also been considered.
机译：矿物碳酸化是将压缩的CO_2储存在地下资源库中的一种潜在诱人的替代方法，称为地质封存。各种研究人员已经提出了将碱性矿石（例如硅酸镁）转化为碳酸盐的方法，并将碳酸盐作为回填物存储在代表固体碳汇的原始矿山中。在此检查了此类碳汇对酸雨和其他强酸来源的稳定性。公认的是，在强酸的存在下，碳酸盐会溶解并释放出二氧化碳。进行了敏感性分析，涵盖美国，中国，欧洲和澳大利亚的工业区可能遇到的年平均降雨量和pH值，以确定矿物碳酸化碳汇的最大CO_2再释放速率。该分析基于最坏情况的假设，该假设等于假设碳酸盐溶解的无限快速动力学。分析表明，在任何可能的pH值和降雨条件下，储存的CO_2的泄漏率均可以忽略不计。在澳大利亚条件下的假设案例研究中对此进行了说明。因此提出，在实际的人的时间尺度上，可以认为通过矿物碳酸化作用进行的螯合是永久的。还考虑了其​​他可能的酸源。

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  • 来源
    《Environmental Science & Technology》 |2010年第7期|p.2735-2739|共5页
  • 作者

    DANIEL J. ALLEN; GEOFF F. BRENT;

  • 作者单位

    Orica Pty. Ltd., P.O. Box 196, Kurri Kurri, New South Wales 2327, Australia;

    Orica Pty. Ltd., P.O. Box 196, Kurri Kurri, New South Wales 2327, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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