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Atmospheric Carbon Mineralization in an Industrial-Scale Chrysotile Mining Waste Pile

机译：工业规模的温石棉开采废料堆中的大气碳矿化

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摘要

Magnesium-rich minerals that are abundant in ultramafic mining waste have the potential to be used as a safe and permanent sequestration solution for carbon dioxide (CO2). Our understanding of thermo-hydro-chemical regimes that govern this reaction at an industrial scale, however, has remained an important challenge to its widespread implementation. Through a year-long monitoring experiment performed at a 110 Mt chrysotile waste pile, we have documented the existence of two distinct thermo-hydrochemical regimes that control the ingress of CO2 and the subsequent mineral carbonation of the waste. The experimental results are supported by a coupled free-air/porous media numerical flow and transport model that provides insights into optimization strategies to increase the efficiency of mineral sequestration at an industrial scale. Although functioning passively under less-than-optimal conditions compared to laboratory-scale experiments, the 110 Mt Thetford Mines pile is nevertheless estimated to be sequestering up to 100 tonnes of CO2 per year, with a potential total carbon capture capacity under optimal conditions of 3 Mt. Annually, more than 100 Mt of ultramafic mine waste suitable for mineral carbonation is generated by the global mining industry. Our results show that this waste material could become a safe and permanent carbon sink for diffuse sources of CO2.
机译：在超镁铁矿开采废物中富含的富含镁的矿物有可能被用作二氧化碳的永久安全固存解决方案。然而，我们对在工业规模上控制该反应的热-水-化学方法的理解仍然是对其广泛实施的重要挑战。通过在110吨温石棉废料堆上进行的为期一年的监测实验，我们记录了存在两种不同的热-水化学方法来控制CO2的进入和随后的废物矿物碳酸化。实验结果得到耦合的自由空气/多孔介质数值流动和传输模型的支持，该模型提供了对优化策略的见解，以提高工业规模上的矿物固存效率。尽管与实验室规模的实验相比，在不理想的条件下被动发挥作用，但估计110吨的Thetford矿堆每年可封存高达100吨的CO2，在最佳条件下3的潜在总碳捕获能力公吨。每年，全球采矿业产生超过100吨的适于矿物碳化的超镁铁矿废料。我们的结果表明，这种废料可以成为分散的CO2来源的安全且永久的碳汇。

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  • 来源
    《Environmental Science & Technology》 |2018年第14期|8050-8057|共8页
  • 作者

    Nowamooz Ali; Dupuis J. Christian; Beaudoin Georges; Molson John; Lemieux Jean-Michel; Horswill Micha; Fortier Richard; Larachi Faical; Maldague Xavier; Constantin Marc; Duchesne Josee; Therrien Rene;

  • 作者单位

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Res Ctr Geol & Engn Mineral Resources E4m, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Res Ctr Geol & Engn Mineral Resources E4m, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

    Univ Laval, Dept Geol & Genie Geol, Quebec City, PQ G1V 0A6, Canada;

  • 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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