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首页> 外文期刊>ISIJ international >Effect of Hydrogen Concentration in Reducing Gas on the Changes in Mineral Phases during Reduction of Iron Ore Sinter
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Effect of Hydrogen Concentration in Reducing Gas on the Changes in Mineral Phases during Reduction of Iron Ore Sinter

机译：氢气浓度降低气体对铁矿烧结减少过程中矿物相变的影响

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摘要

In order to decrease CO_2 emission from the ironmaking process, an increasing use of hydrogen in blast furnace (BF) ironmaking is a promising way. In this case, the properties of iron ore sinter such as reducibility and strength need to be optimized because hydrogen reduction of iron oxide is an endothermic reaction and temperature distribution in BF drastically changes. In this study, the effect of hydrogen concentration in the reducing gas on the changes in mineral phases during reduction of iron ore sinter is evaluated. Mineral composition of the ten types of sinter samples was analyzed by XRD and image analysis. Sinter sample was reduced under the simulated conditions such as Low-H_2 (N_2 - 48%(CO + CO_2) - 5.8%(H_2 + H_2O)) and High-H_2 (N_2 - 48%(CO + CO_2) - 13%(H_2 + H_2O)). After reduction, microstructure of the sample was observed. Iron ore sinters usually consist of mineral phases such as hematite, magnetite, calcium-ferrites and slag. Furthermore, calcium-ferrite phases are roughly divided into four types: 1) acicular texture coexisted with primary hematite (1H-ACF), 2) columnar texture coexisted with secondary hematite (2H-CF), 3) small and 4) large columnar textures coexisted with magnetite (M-FCF and M-CCF). An increase in hydrogen concentration of reducing gas accelerates the reduction of hematite, 1H-ACR and 2H-CF in all sinter samples, while it does not affect the reduction of magnetite, and calcium-ferrite coexisted with magnetite.
机译：为了减少来自炼制过程的CO_2排放，在高炉（BF）炼铁中增加氢气的使用是一种有希望的方式。在这种情况下，需要优化铁矿石烧结的性质，例如还原和强度，因为氧化铁的氢还原是BF的吸氢反应和强烈变化。在该研究中，评估了在还原气体降低过程中的氢气浓度对铁矿石烧结烧结烧结过程中矿物相变的影响。通过XRD和图像分析分析了十种烧结样品的矿物组合物。在模拟条件下降低烧结样品，例如低温 - H_2（N_2-48％（CO + CO_2） - 5.8％（H_2 + H_2O））和高H_2（N_2 - 48％（CO + CO_2） - 13％（ h_2 + h_2o））））。减少后，观察样品的微观结构。铁矿石烧结通常由矿物阶段如赤铁矿，磁铁矿，钙铁氧体和渣组成。此外，钙 - 铁素体相大致分为四种类型：1）针状纹理与初级赤铁矿（1H-ACF），2）柱状纹理共存，其与二次赤铁矿（2H-CF），3）小和4）大柱状纹理共存。与磁铁矿（M-FCF和M-CCF）共存。还原气体的氢浓度的增加加速了所有烧结样品中赤铁矿，1H-ACR和2H-CF的减少，而它不会影响磁铁矿的还原，并与磁铁矿共存的钙 - 铁素体。

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  • 来源
    《ISIJ international》 |2020年第12期|2678-2685|共8页
  • 作者

    Taichi MURAKAMI; Hiroki WAKABAYASHI; Daisuke MARUOKA; Eiki KASAI;

  • 作者单位

    Graduate School of Environmental Studies Tohoku University 6-6-02 Aramaki-aza Aoba Aoba-ku Sendai 980-8579 Japan;

    Graduate School of Environmental Studies Tohoku University. Now at Denso Corp. 1-1 Showa-cho Kariya Aichi 448-8661 Japan;

    Graduate School of Environmental Studies Tohoku University 6-6-02 Aramaki-aza Aoba Aoba-ku Sendai 980-8579 Japan;

    Graduate School of Environmental Studies Tohoku University 6-6-02 Aramaki-aza Aoba Aoba-ku Sendai 980-8579 Japan;

  • 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

    sinter; calcium ferrite; hydrogen; reduction;

    机译：烧结;铁氧体;氢;减少;

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