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首页> 外文期刊>ISIJ international >Effect of Temperature on Hexavalent Chromium Formation in (AI,Cr)_20_3 with Calcium Aluminate Cement in Air
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Effect of Temperature on Hexavalent Chromium Formation in (AI,Cr)_20_3 with Calcium Aluminate Cement in Air

机译：温度对（AI，Cr）_20_3在空气中钙铝酸钙水泥中六价铬形成的影响

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摘要

Cr_2O_3 containing refractories castables are widely used as linings of various furnaces because of its remarkable corrosion resistance. However, Cr_2O_3 can be oxidized to toxic Cr(Vl) by calcium aluminate cement phases (CA and CA_2) which are used as hydraulic binder in castables. In the present research, one of the most stable Cr(lll) phase viz., (Al,Cr)_2O_3 solid solution was synthesized and then reacted with cement phases in order to check the formation of Cr(Vl). The (Al, Cr)_2O_3 solid solution and calcium aluminate cement (70% Al_2O_3) were mixed in the ratio 1:1 (mass%) and heated in the temperature range of 500-1 500C in air. The phase compositions and formation/leachability of Cr(Vl) were investigated using XRD, XPS and the leaching tests. The (Al,Cr)_2O_3 solid solution didn't react with calcium aluminate cement at 500-900C, while it partially converted to a Cr(Vl)-containing phase at 1 100-1 300C. However, (Al,Cr)_2O_3 and cement phases react to form a ternary Cr(lll) phase (Ca(Al,Cr)_(12)O_(19) at 1 500C.
机译：由于其显着的耐腐蚀性，CR_2O_3含有耐火材料铸件广泛用作各种熔炉的衬里。然而，Cr_2O_3可以通过氧化铝水泥相（CA和Ca_2）氧化成毒性Cr（V1），其用作浇注液中的液压粘合剂。在本研究中，合成（Al，Cr）相级，（Al，Cr）_2O_3固体溶液，然后与水泥相反应以检查Cr（V1）的形成。将（Al，Cr）_2O_3固溶体和铝酸钙水泥（70％Al_2O_3）以1：1（质量％）混合，并在空气中的500-1 500℃的温度范围内加热。使用XRD，XPS和浸出试验研究Cr（VL）的相组合物和形成/可渗滤性。 （A1，Cr）_2O_3固溶体在500-900℃下没有与铝酸钙水泥反应，同时它在1 100-1300℃下部分转化为Cr（V1）筛选相。然而，（Al，Cr）_2O_3和水泥相反应以形成三元Cr（LLL）相（Ca（Al，Cr）_（12）O_（12）O_（19）在1 500℃。

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  • 来源
    《ISIJ international》 |2019年第7期|1178-1183|共6页
  • 作者

    Yingjiang WU; Shengqiang SONG; Zhengliang XUE; Mithun NATH;

  • 作者单位

    The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources Wuhan 430081 China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 China;

    The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources Wuhan 430081 China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 China;

    The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China Hubei Provincial Engineering Technology Research Center of Metallurgical Secondary Resources Wuhan 430081 China Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education Wuhan University of Science and Technology Wuhan 430081 China;

    The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and Technology Wuhan 430081 China National-provincial Joint Engineering Research Center of High Temperature Materials & Lining Technology Wuhan University of Science & Technology Wuhan 430081 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    (Al, Cr)_2O_3 solid solution; calcium aluminate cement; Cr(Vl); leaching.;

    机译：（Al;Cr）_2O_3固溶体;钙铝酸钙;CR（vl）;浸出。;

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