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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石英，方解石和橄榄石添加剂的相互作用

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Magnetite-based pellets with large amounts of the additives olivine, calcite and quartzite were isothermally 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 wüstite at three different temperatures: 900, 1000 and 1150°C. 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 fayalitic melt at 1000°C. The calcium ferrites of the pellets with calcite reacted to form a porous calciowüstite already at 900°C. In the pellets with olivine, the magnesium, which had constrained into magnesioferrite pockets after induration, redistributed into the entire iron oxide structure at 900°C and also reacted with silica at 1000°C. The olivine core which had not reacted during induration did not appear to react in reducing conditions at temperatures of 1150°C 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大量添加剂橄榄石，方解石和石英岩的磁铁矿颗粒，以研究和描述颗粒中添加剂矿物的反应行为。热还原设定为在三种不同温度下（900、1000和1150°C）产生白钨矿。通过扫描电子显微镜和X射线衍射研究还原之前和之后形成的矿物相。由于硬化过程中的不同反应行为，具有不同添加剂的颗粒在还原前就已经有所不同：结果表明，使用所有三种添加剂的颗粒在还原过程中可以识别出主要反应。除了极小的石英岩颗粒外，所有其他颗粒都在还原性气氛中保持不活泼，直到它们开始在1000°C形成铁橄榄石熔体。球状钙铁矿与方解石的钙已经在900°C下反应形成多孔钙钙石。在具有橄榄石的颗粒中，镁在硬结后被限制在镁铁氧体囊中，然后在900°C时重新分布到整个氧化铁结构中，并在1000°C下与二氧化硅反应。在硬化过程中没有反应的橄榄石核在1150℃及以下的还原条件下似乎没有反应。这些反应机理表明减少粒料中所需添加剂量的潜力。

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