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首页> 外文期刊>Journal of Hazardous Materials >Characterization of chromium doped tricalcium silicate using SEM/EDS, XRD and FTIR
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Characterization of chromium doped tricalcium silicate using SEM/EDS, XRD and FTIR

机译:使用SEM / EDS,XRD和FTIR表征铬掺杂的硅酸三钙

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摘要

The containment of chromium in tricalcium silicate (C_3S~1) has been investigated. Tricalcium silicate is a major component in ordinary Portland cement (OPC), and chromium compounds used as dopants simulate chromium wastes that might be stabilized in a cement matrix. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to probe the distribution of chromium in the stabilized waste form and also to identify the microstructural changes in the normal hydration products of C_3S accompanying the addition of chromium as Cr(Ⅲ) and Cr(Ⅵ). X-ray diffraction (XRD) was used to monitor the hydration reaction of C_3S and formation of crystalline calcium hydroxide (CH). The effect of chromium addition on the condensation of the orthosilicate units in C_3S was followed with Fourier transform infrared spectroscopy (FTIR). Standard acetic acid leaching tests were carried out to evaluate the mobility of chromium in the Cr(Ⅲ)/C_3S and Cr(Ⅵ)/C_3S systems. Probable mechanisms of chromium containment in the amorphous calcium silicate hydrate (C-S-H) phase are discussed.
机译:研究了硅酸三钙(C_3S〜1)中铬的含量。硅酸三钙是普通波特兰水泥(OPC)中的主要成分,用作掺杂剂的铬化合物模拟了铬废物,这些废物可能稳定在水泥基体中。使用扫描电子显微镜(SEM)和能量色散X射线光谱(EDS)来探测稳定废物形式中铬的分布,并确定伴随添加铬作为Cr的C_3S正常水合产物的微观结构变化。 (Ⅲ)和Cr(Ⅵ)。 X射线衍射(XRD)用于监测C_3S的水合反应和结晶氢氧化钙(CH)的形成。通过傅里叶变换红外光谱(FTIR)跟踪了铬添加对C_3S中原硅酸酯单元缩合的影响。进行标准的乙酸浸出试验,以评估铬在Cr(Ⅲ)/ C_3S和Cr(Ⅵ)/ C_3S系统中的迁移率。讨论了无定形硅酸钙水合物(C-S-H)相中铬的可能保留机理。

著录项

  • 来源
    《Journal of Hazardous Materials》 |1995年第1期|p.87-102|共16页
  • 作者单位

    Department of Mining, Metallurgical and Petroleum Engineering, University of Alberta, Edmonton, Alta., Canada T6G 2G6;

  • 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
  • 中图分类 工程基础科学;
  • 关键词

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