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首页> 外文期刊>Environmental Science & Technology >Thermal Activation of Antigorite for Mineralization of CO_2
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Thermal Activation of Antigorite for Mineralization of CO_2

机译：蛇纹石的热活化以CO_2矿化

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摘要

This contribution demonstrates the sensitivity of antigorite dehydroxylation to treatment conditions and discusses the implications of the observations for scientific (i.e., dehydroxylation kinetics) and technological (i.e., energy efficient conditions and design of practical activation reactors) applications. At present, the energy cost of dehydroxylation of serpentinite ores represent the most important impediment for a large scale implementation of sequestering CO_2 by mineralization. We have analyzed changes in antigorite's derivative thermogravimetric curves (DTG) and deduced factors affecting the mass loss profiles. The imposed heating rate, type of purge gas, type of comminution and sample mass all influence the dehydroxylation curve. However, the results show no influence of material of construction of the heating vessel and flow rate of the purge gas. We report an important effect of oxidation of Fe~(2+) under air purge gas that occurs prior to dehydroxylation and leads to formation of hematite skins on serpentinite particles, slowing down subsequent mass transfer and increasing the treatment temperature. From the process perspective, 75 μm particles afford optimal conditions of temperature and rate of dehydroxylation. Overall, the practical considerations, in thermally activating serpentinite ores for storing CO_2 by carbonation, comprise rapid heating, proper size reduction, prior demagnetisation, and fluidization of the powder bed.
机译：这项贡献证明了蛇纹石脱羟基对处理条件的敏感性，并讨论了观察结果对科学（即脱羟基动力学）和技术（即节能条件和实际活化反应器设计）应用的意义。目前，蛇纹石矿石脱羟基化的能源成本是大规模实施通过矿化隔离CO_2的最重要障碍。我们已经分析了反蛇纹石的导数热重曲线（DTG）的变化以及影响质量损失曲线的推论因素。施加的加热速率，吹扫气体的类型，粉碎的类型和样品质量都会影响脱羟基曲线。但是，结果表明加热容器的结构材料和吹扫气体的流量没有影响。我们报道了在空气净化气体中Fe〜（2+）在脱羟基之前发生的氧化的重要作用，这导致在蛇纹石颗粒上形成赤铁矿皮，减慢了后续的传质并提高了处理温度。从工艺角度来看，75μm颗粒提供了最佳的温度条件和脱羟基速率。总体而言，在热活化蛇纹石矿石以通过碳化来存储CO_2时，实际考虑因素包括快速加热，适当减小尺寸，事先退磁以及粉末床的流化。

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  • 来源
    《Environmental Science & Technology》 |2013年第1期|182-190|共9页
  • 作者

    Reydick D. Balucan; Bogdan Z. Dlugogorski;

  • 作者单位

    Priority Research Centre for Energy, The University of Newcastle, Callaghan, NSW 2308, Australia;

    Priority Research Centre for Energy, The University of Newcastle, Callaghan, NSW 2308, 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);
  • 原文格式 PDF
  • 正文语种 eng
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