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首页> 外文期刊>Environmental Science & Technology >Pyrolysis Treatment of Chromite Ore Processing Residue by Biomass: Cellulose Pyrolysis and Cr(Ⅵ) Reduction Behavior
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Pyrolysis Treatment of Chromite Ore Processing Residue by Biomass: Cellulose Pyrolysis and Cr(Ⅵ) Reduction Behavior

机译：生物质热解铬铁矿渣的纤维素热解及Cr（Ⅵ）还原行为

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摘要

The pyrolysis treatment with biomass is a promising technology for the remediation of chromite-ore-processing residue (COPR). However, the mechanism of this process is still unclear. In this study, the behavior of pyrolysis reduction of Cr(Ⅵ) by cellulose, the main component of biomass, was elucidated. The results showed that the volatile fraction (VF) of cellulose, ie. gas and tar, was responsible for Cr(Ⅵ) reduction. All organic compounds, as well as CO and H2 in VF, potentially reduced Cr(Ⅵ). X-ray absorption near-edge structure (XANES) spectroscopy and extended X-ray absorption fine-structure (EXAFS) spectroscopy confirmed the reduction of Cr(Ⅵ) to Cr(Ⅲ) and the formation of amorphous Cr_2O_3. The remnant Cr(Ⅵ) content in COPR can be reduced below the detection limit (2 mg/kg) by the reduction of COPR particle and extension of reaction time between VF and COPR. This study provided a deep insight on the co-pyrolysis of cellulose with Cr(Ⅵ) in COPR and an ideal approach by which to characterize and optimize the pyrolysis treatment for COPR by other organics.
机译：用生物质进行热解处理是修复铬铁矿加工残渣（COPR）的有前途的技术。但是，此过程的机制仍不清楚。在这项研究中，阐明了纤维素（生物质的主要成分）热解还原六价铬的行为。结果表明，纤维素的挥发性分数（VF），即。气体和焦油是造成Cr（Ⅵ）还原的原因。 VF中的所有有机化合物以及CO和H2都可能还原Cr（Ⅵ）。 X射线吸收近边缘结构（XANES）光谱和扩展X射线吸收精细结构（EXAFS）光谱证实了Cr（Ⅵ）还原为Cr（Ⅲ）并形成了非晶态Cr_2O_3。通过减少COPR颗粒和延长VF和COPR之间的反应时间，可将COPR中的残留Cr（Ⅵ）含量降低到检测极限（2 mg / kg）以下。这项研究为纤维素与Cr（Ⅵ）在COPR中的共热解提供了深刻的见解，并为表征和优化其他有机物对COPR的热解处理提供了理想的方法。

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  • 来源
    《Environmental Science & Technology》 |2016年第6期|3111-3118|共8页
  • 作者

    Da-Lei Zhang; Mei-Yi Zhang; Chu-Hui Zhang; Ying-Jie Sun; Xiao Sun; Xian-Zheng Yuan;

  • 作者单位

    School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao, Shandong Province 266033 P. R. China;

    Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, P. R. China;

    School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao, Shandong Province 266033 P. R. China;

    School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao, Shandong Province 266033 P. R. China;

    School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao, Shandong Province 266033 P. R. China;

    Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, Shandong Province 266101, P. R. China;

  • 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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