The current study investigates the effect of microwave processing on low-grade banded iron ore using charcoal, coking coal, and non-coking coal. Charcoal showed better microwave heating response at low temperatures, and the coals exhibit better heating response at higher temperatures. Low carbon dosage ~ 12% is sufficient to generate concentrate with 61.8% iron grade and ~6% for 94.8% iron recovery comprising of magnetite phase suitable for iron-making applications. The process separation efficiency of ~ 95% is achieved at 6% carbon dosage and decreases with an increase in carbon due to formation of the fayalite phase. The metallization degree showed a strong dependency on reductant dosage and achieved a maximum value of 22.7% at 18% charcoal. The comparison of ore with pure iron oxide and the synthetic mixture of iron oxide indicated that the underlying bonding due to banded structure enhances the Joule heating during microwave irradiation and thereby aids in attaining higher temperature and better separation.

中文翻译：

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不同还原剂微波处理低品位带状铁矿

目前的研究调查了微波处理对使用木炭、焦煤和非焦煤的低品位带状铁矿石的影响。木炭在低温下表现出更好的微波加热响应，而煤在更高温度下表现出更好的加热响应。低碳用量 ~ 12% 足以产生铁品位为 61.8% 的精矿和 ~6% 的 94.8% 铁回收率，包括适用于炼铁应用的磁铁矿相。约 95% 的过程分离效率在 6% 的碳剂量下实现，并且由于铁橄榄石相的形成而随着碳的增加而降低。金属化度对还原剂用量有很强的依赖性，在 18% 的木炭时达到 22.7% 的最大值。