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首页> 外文期刊>Environmental Science & Technology >Monitoring of Stainless-Steel Slag Carbonation Using X-ray Computed Microtomography
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Monitoring of Stainless-Steel Slag Carbonation Using X-ray Computed Microtomography

机译：使用X射线计算机断层摄影术监测不锈钢炉渣碳化

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摘要

Steel production is one of the largest contributors to industrial CO_2 emissions. This industry also generates large amounts of solid byproducts, such as slag and sludge. In this study, fine grained stainless-steel slag (SSS) is valorized to produce compacts with high compressive strength without the use of a hydraulic binder. This carbonation process is investigated on a pore-scale level to identify how the mineral phases in the SSS react with CO_2 where carbonates are formed, and what the impact of these changes is on the pore network of the carbonated SSS compact. In addition to conventional research techniques, high-resolution X-ray computed tomography (HRXCT) is applied to visualize and quantify the changes in situ during the carbonation process. The results show that carbonates mainly precipitate at grain contacts and in capillary pores and this precipitation has little effect on the connectivity of the pore space. This paper also demonstrates the use of a custom-designed polymer reaction cell that allows in situ HRXCT analysis of the carbonation process. This shows the distribution and influence of water and CO_2 in the pore network on the carbonate precipitation and, thus, the influence on the compressive strength development of the waste material.
机译：钢铁生产是工业CO_2排放的最大贡献者之一。该行业还产生大量的固体副产品，例如炉渣和污泥。在这项研究中，不使用水硬性粘结剂就对细晶粒的不锈钢炉渣（SSS）进行了增值处理，以生产出具有高抗压强度的压坯。在孔隙水平上研究了该碳化过程，以确定SSS中的矿物相如何与形成碳酸盐的CO_2反应，以及这些变化对碳酸盐化SSS压实体孔网络的影响。除了传统的研究技术外，高分辨率X射线计算机断层扫描（HRXCT）还可用于可视化和量化碳化过程中的原位变化。结果表明，碳酸盐主要在颗粒接触和毛细孔中沉淀，这种沉淀对孔空间的连通性影响很小。本文还演示了定制设计的聚合物反应池的使用，该反应池可对碳酸化过程进行原位HRXCT分析。这表明孔隙网络中水和CO_2的分布及其对碳酸盐沉淀的影响，从而对废料的抗压强度发展产生了影响。

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  • 来源
    《Environmental Science & Technology》 |2014年第1期|674-680|共7页
  • 作者

    Marijn A. Boone; Peter Nielsen; Tim De Kock; Matthieu N. Boone; Mieke Quaghebeur; Veerle Cnudde;

  • 作者单位

    Unit Sustainable Materials Management, VITO, Mol 2400, Belgium,Department of Geology and Soil Science Ghent University, Gent 9000, Belgium;

    Unit Sustainable Materials Management, VITO, Mol 2400, Belgium;

    Department of Geology and Soil Science, Ghent University, Gent 9000, Belgium;

    Department of Physics and Astronomy, Ghent University, Gent 9000, Belgium;

    Unit Sustainable Materials Management, VITO, Mol 2400, Belgium;

    Department of Geology and Soil Science, Ghent University, Gent 9000, Belgium;

  • 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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