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首页> 外文期刊>ISIJ international >Mass Transfer of P_2O_5 between Liquid Slag and Solid Solution of 2CaO-SiO_2 and 3CaO·P_2O_5
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Mass Transfer of P_2O_5 between Liquid Slag and Solid Solution of 2CaO-SiO_2 and 3CaO·P_2O_5

机译：P_2O_5在2CaO-SiO_2和3CaO·P_2O_5固溶体之间的传质

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摘要

Hot metal dephosphorization slags in the BOF can be considered to be within the CaO-SiO_2-FeO-P_2O_5 system, and are usually in the dicalcium silicate (C_2S) saturated composition range. It is well known that C_2S forms a pseudo-binary solid solution with tricalcium phosphate (C_3P) over a wide composition range at the dephosphorization treatment temperature. To increase the reaction efficiency of dephosphorization, it is important to increase the mass transfer rate of P_2O_5 from the liquid slag to the solid solution.rnIn order to clarify the mechanism of mass transfer of P_2O_5 between the solid solution and liquid slag, an artificially made C_2S-C_3P solid solution rod was dipped into the C_2S-C_3P saturated slag and the interface was observed.rnWhen the activity of P_2O_5 in liquid slag was higher than that in solid solution, a reaction layer was formed at the interface, and its width increased with immersion time. A concentration gradient of P_2O_5 was observed in the solid solution.rnWhen the activity of P_2O_5 in liquid slag was lower than that in solid solution, no reaction layer was formed, and P_2O_5 did not transfer to the liquid slag. In this case, P_2O_5 in the solid solution was quite stable.rnThe reason for these phenomena was discussed. The mass transfer of CaO and SiO_2 must occur simultaneously with the mass transfer of P_2O_5 in order to maintain the pseudo-binary relation of the solid solution.
机译：BOF中的铁水脱磷渣可认为在CaO-SiO_2-FeO-P_2O_5体系内，并且通常在硅酸二钙（C_2S）饱和组成范围内。众所周知，在脱磷处理温度下，C_2S与磷酸三钙（C_3P）形成伪二元固溶体，其组成范围很广。为了提高脱磷反应的效率，重要的是提高P_2O_5从液态渣向固溶体的传质速率。rn为了阐明P_2O_5在固溶体与液态渣之间的传质机理，是人工制造的。将C_2S-C_3P固溶棒浸入C_2S-C_3P饱和炉渣中并观察界面.rn当液态炉渣中P_2O_5的活性高于固溶体时，在界面处形成反应层，宽度增加与沉浸时间。在固溶体中观察到P_2O_5的浓度梯度。·当液态渣中P_2O_5的活性低于固溶体中的活性时，没有形成反应层，并且P_2O_5没有转移到液态渣中。在这种情况下，固溶体中的P_2O_5相当稳定。讨论了这些现象的原因。 CaO和SiO_2的传质必须与P_2O_5的传质同时进行，以保持固溶体的拟二元关系。

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  • 来源
    《ISIJ international》 |2009年第12期|1838-1844|共7页
  • 作者

    SHIN-YA KITAMURA; SHINYA SAITO; KEITA UTAGAWA; HIROYUKI SHIBATA; DAVID G. C. ROBERTSON;

  • 作者单位

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577 Japan;

    Graduate School of Engineering, Tohoku University, 2-1-1 Katahira, Aoba-ku,Sendai, Miyagi 980-8577 Japan Nippon Steel Corporation, 5-3 Tokaimachi, Tokai Aichi, Japan;

    Graduate School of Engineering, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577 Japan Kobe Steel Ltd., 14-1 Chofu Minatomachi, Shimonoseki, Yamaguchi, Japan;

    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577 Japan;

    Missouri University of Science & Technology, 143 McNutt Hall, Fiolla, Missouri 65409-0340, USA;

  • 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
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  • 关键词

    hot metal dephosphorization; dicalcium silicate; tricalcium phosphate; mass transfer; diffusion;

    机译：铁水脱磷硅酸二钙磷酸三钙传质扩散;

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