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首页> 外文期刊>ISIJ international >Optimization of Dolomite Usage in Iron Ore Sintering Process
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Optimization of Dolomite Usage in Iron Ore Sintering Process

机译：铁矿烧结过程中白云石用量的优化

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摘要

To achieve the action mechanism and optimal usage of dolomite in the sintering process, solid reaction tests, fluidity tests, bonding strength tests and sinter pot tests were conducted, then microstructure and energy spectrum were analysed further. Reaction temperature of dolomite with calcium ferrite was lower than that with limonite iron ore about 155℃. Fluidity of bonding phase and strength of sinter using dolomite were lower than that using light burned dolomite and serpentine owing to the higher MgO content in the calcium ferrite and formation of secondary bonding phase. Action mechanism of dolomite in sintering process mainly included 4 steps, thermal decomposition, solid reaction, formation of primary bonding phase and formation of secondary bonding phase. Dolomite mainly played it's role in the third step in which high viscosity CFM (calcium ferrite with MgO) and magnetite solid solution formed. Increasing the solid solubility of MgO in magnetite by mixing dolomite with magnetite concentrate before granulation, decreasing the dispersity of MgO in sinter mixture by increasing the particle size of dolomite appropriately, increasing the separation degree of MgO and CaO by light-burning the dolomite, and decreasing the reaction amount of MgO by using big particle size magnesia, all could decrease the content of MgO in calcium ferrite, thus showed good performance in sinter pot tests.
机译：为了实现白云石在烧结过程中的作用机理和最佳使用，进行了固相反应试验，流动性试验，结合强度试验和烧结罐试验，然后进一步分析了组织和能谱。白云石与铁酸钙的反应温度比与褐铁铁矿的反应温度低约155℃。由于铁酸钙中MgO含量较高，并且形成二次粘结相，因此使用白云石的粘结相的流动性和烧结强度低于使用轻烧白云石和蛇纹石的烧结相。白云石在烧结过程中的作用机理主要包括热分解，固相反应，一次结合相形成和二次结合相形成四个步骤。白云石在形成高粘度CFM（含MgO的铁酸钙）和磁铁矿固溶体的第三步中起主要作用。通过在造粒前将白云石与磁铁矿精矿混合来增加MgO在磁铁矿中的固溶度，通过适当增加白云石的粒径，降低烧结矿混合物中MgO的分散度，通过轻烧白云石来增加MgO和CaO的分离度，以及通过使用大粒径氧化镁降低MgO的反应量，都可以降低铁酸钙中MgO的含量，因此在烧结罐试验中表现出良好的性能。

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  • 来源
    《ISIJ international》 |2013年第9期|1515-1522|共8页
  • 作者

    Guoliang ZHANG; Shengli WU; Shaoguo CHEN; Juan ZHU; Jiaxin FAN; Bo SU;

  • 作者单位

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China;

    State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 China,School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing, 100083 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

    iron ore sinter; dolomite; action mechanism; usage optimization;

    机译：铁矿烧结矿白云石;动作机制使用优化;

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