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Shear-Force Based Stainless Steel Slag Modification for Chromium Immobilization

机译：基于剪切力的不锈钢渣改性铬

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摘要

Immobilization of chromium in a stable spinel by modification is a powerful way to prevent chromium pollution of stainless steel (SS) slags. The precipitated spinel grain size is usually smaller than 30 μm, however, which limits the effectiveness of the modification. In the literature, very few efforts have been reported on promotion of spinel growth rate by optimizing the dynamic conditions. In this study, the effects of shear force on the spinel grain size evolution under isothermal conditions and during cooling were investigated. The experimental results indicate that the employment of shear force significantly changes the growth behavior of spinel at 1 500℃. The growth mechanism of spinel was studied by using crystal size distribution (CSD) theory, showing different regimes of supply-controlled Ostwald ripening, surface-controlled growth with decaying nucleation rate, and constant rate nucleation and growth at shear rates of 0 s~(-1), 10.83 s~(-1) and 21.67 s(-1), respectively. On the other hand, at a cooling rate of 5℃•min~(-1), the shear force was found to have little effect on the crystallization behavior of spinel. The results of static leaching tests indicated that hardly any chromium had leached, which makes the modified SS slag more environmentally friendly when used as a raw material.
机译：通过改性将铬固定在稳定的尖晶石中是防止不锈钢（SS）炉渣铬污染的有效方法。但是，析出的尖晶石晶粒尺寸通常小于30μm，这限制了改性的有效性。在文献中，很少有关于通过优化动态条件来促进尖晶石生长速率的努力的报道。在这项研究中，研究了剪切力对等温条件和冷却过程中尖晶石晶粒尺寸演变的影响。实验结果表明，剪切力的施加显着改变了尖晶石在1500℃下的生长行为。利用晶体尺寸分布（CSD）理论研究了尖晶石的生长机理，表明了供应控制的奥斯特瓦尔德熟化，具有成核速率衰减的表面控制生长，以及恒定速率成核和剪切速率为0 s〜（）的生长的不同机制。 -1），10.83 s〜（-1）和21.67 s（-1）。另一方面，在5℃·min〜（-1）的冷却速度下，剪切力对尖晶石的结晶行为影响很小。静态浸出试验的结果表明，几乎没有铬被浸出，这使得改性的SS渣用作原料时对环境更加友好。

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  • 来源
    《ISIJ international》 |2019年第3期|583-589|共7页
  • 作者

    Qing ZHAO; Chengjun LIU; Longhu CAO; Maofa JIANG; Baokuan LI; Henrik SAXEN; Ron ZEVENHOVEN;

  • 作者单位

    Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang, 110819 China;

    Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang, 110819 China;

    Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang, 110819 China;

    Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), School of Metallurgy, Northeastern University, Shenyang, 110819 China;

    School of Metallurgy, Northeastern University, Shenyang, 110819 China;

    Thermal and Flow Engineering Laboratory, Abo Akademi University, Abo/Turku, 20500 Finland;

    Thermal and Flow Engineering Laboratory, Abo Akademi University, Abo/Turku, 20500 Finland;

  • 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

    stainless steel slag; spinel; crystal growth; modification; shear force; chromium immobilization;

    机译：不锈钢渣尖晶石晶体生长修改;剪切力铬固定;

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