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首页> 外文期刊>ISIJ international >Interactions between Iron Oxides and the Additives Quartzite, Calcite and Olivine in Magnetite based Pellets
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Interactions between Iron Oxides and the Additives Quartzite, Calcite and Olivine in Magnetite based Pellets

机译：磁铁矿球粒中氧化铁与添加剂石英岩，方解石和橄榄石之间的相互作用

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摘要

Magnetite-based pellets with large amounts of the additives olivine, calcite and quartzite were isother-mally reduced in a tubular furnace to study and describe the reaction behaviour of the additive minerals in the pellets.The reduction was thermodynamically set to yield wustite at three different temperatures: 900, 1 000 and 1 150℃.The mineralogical phases that had formed before and after reduction were studied by Scanning electron microscope and X-ray diffraction.The pellets with the different additives were different already before reduction due to different reaction behaviour during induration: The results showed that it was possible to identify the main reactions during reduction for pellets with all three additives.All but the very small quartzite particles remained unreactive in reducing atmosphere until they began to form a fay-alitic melt at 1 000℃.The calcium ferrites of the pellets with calcite reacted to form a porous calciowustite already at 900℃n the pellets with olivine, the magnesium, which had constrained into magnesioferrite pockets after induration, redistributed into the entire iron oxide structure at 900℃ and also reacted with silica at 1 000℃.The olivine core which had not reacted during induration did not appear to react in reducing conditions at temperatures of 1 150℃ and below.These reaction mechanisms have indicated a potential to reduce the required amounts of additives in the pellets.
机译：在管式炉中等温还原含有橄榄石，方解石和石英岩等添加剂的磁铁矿球团，以研究和描述球团中添加剂矿物质的反应行为。热还原设定为在三种不同的条件下生成辉石还原温度为900、1000和1 150℃。通过扫描电子显微镜和X射线衍射研究了还原前后的矿物相。还原过程中，由于反应的不同，具有不同添加剂的颗粒在还原前已经不同。硬结：结果表明，用所有三种添加剂还原颗粒，可以识别出主要反应。除极小的石英岩颗粒外，其余所有颗粒在还原气氛中均无反应，直到它们在1 000℃开始形成辉石状熔体。与方解石成球状的钙铁氧体已经在900℃下与橄榄石成球状反应生成了多孔钙铝铁矿镁在硬结后被约束在铁素体铁矿袋中，在900℃重新分布到整个氧化铁结构中，并在1000℃下与二氧化硅反应。在硬结过程中未反应的橄榄石核在还原条件下似乎不发生反应。这些反应机理表明可以降低颗粒中所需的添加剂量。

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  • 来源
    《ISIJ international》 |2011年第2期|p.173-180|共8页
  • 作者

    Par SEMBERG; Anders RUTQVIST; Charlotte ANDERSSON; Bo BJORKMAN;

  • 作者单位

    Division of Extractive Metallurgy, Lulea University of Technology, SE-971 87 Lulea, Sweden.;

    Division of Extractive Metallurgy, Lulea University of Technology, SE-971 87 Lulea, Sweden.;

    Division of Extractive Metallurgy, Lulea University of Technology, SE-971 87 Lulea, Sweden.;

    Division of Extractive Metallurgy, Lulea University of Technology, SE-971 87 Lulea, Sweden.;

  • 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

    reduction iron ore pellets additives quartzite calcite olivine;

    机译：还原铁矿石球团添加剂石英岩方解石橄榄石;

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