Oleksandr Kovtun , Mykyta Levchenko , Stephan Höntsch , Laura Lohmeier , Marcus Schreiner , Martin Gräbner , Olena Volkova
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引用次数: 0
摘要
要还原含氧化铁的矿石，就必须探索替代方法。回收富含氧化铁的冶金粉尘可作为冶金工艺的二次原料。利用氢气实施环境友好型技术促使人们提出了用氢气还原冶金粉尘以回收二次钢铁生产产品的概念。本研究调查了在 850 °C 温度下氢还原碱性氧气炉粉尘生产的煤块和球团的特性。实验结果表明，球团的还原度约为煤球的 1.5 倍。与铁矿球团的还原膨胀指数文献数据相比，球团的还原膨胀指数明显较低。扫描电子显微镜/能量色散 X 射线光谱法检测了样品微观结构和化学成分的变化。随后对还原样品进行熔化，揭示了铁合金中的非金属夹杂物以及熔渣对其在合金和熔渣之间分布的影响。
Recycling of iron-rich basic oxygen furnace dust using hydrogen-based direct reduction
The reduction of iron oxide-bearing ores necessitates the exploration of alternatives. Recycling iron oxide-enriched metallurgical dust could serve as secondary raw material for metallurgical processes. Implementing environmentally friendly technologies utilizing hydrogen has prompted the concept of hydrogen reduction of metallurgical dust to recycle secondary steel production products. The present study investigates the characteristics of hydrogen reduction of briquettes and pellets produced from basic oxygen furnace dust and reduced at the temperature of 850 °C. Experimental results revealed that the reduction degree for pellets was approximately 1.5 times higher compared to briquettes. The reduction swelling index of pellets was noticeable lower compared to literature data of reduction swelling index for iron ore pellets. Scanning electron microscopy/energy-dispersive X-ray spectroscopy was carried out to detect changes in the microstructure and chemical composition of the samples. Subsequent melting of the reduced samples unveiled non-metallic inclusions within the iron alloy and the impact of slag on their distribution between the alloy and slag.
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