ABSTRACT This paper describes the development of a flowsheet using a combination of sample preparation, magnetic separation (in a range 0.4–1 T), microwave treatment (in a range 0.54–0.9 kW), and leaching operations (HCl, in a range 0.25–1.25 M) for the beneficiation of iron ores (Total Fe [TFE]: 55.48%). The work was aimed at recovering TFE from the non-magnetic product by increasing its magnetic susceptibility through microwave treatment. It was found that goethite mineral in the non-magnetic product at a temperature of around 200oC was converted to paramagnetic (hematite) or ferromagnetic minerals (maghemite and magnetite) by microwave treatment and overall beneficiation recovery was improved. The phosphorus (P) content in the final product was then removed by leaching in 0.25 M HCl. The iron loss from the final concentrate during leaching was found to be 0.78%, which was negligible. Overall, a final concentrate assaying 61.78% TFE with a recovery of 94.97%, and containing 0.04% P with 94.73% removal was obtained providing satisfactory results for use in the industry. This study gives an alternative way for possible future studies to produce an iron concentrate with a high recovery from problematic iron ores, which can be categorised due to its P content.

中文翻译：

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微波辅助磁选后脱磷浸提提质铁矿石

摘要 本文描述了使用样品制备、磁分离（范围为 0.4-1 T）、微波处理（范围为 0.54-0.9 kW）和浸出操作（HCl，范围为 0.25 –1.25 M) 用于铁矿石的选矿（总铁 [TFE]：55.48%）。这项工作旨在通过微波处理增加其磁化率，从非磁性产品中回收 TFE。发现非磁性产品中的针铁矿在 200oC 左右的温度下通过微波处理转化为顺磁性（赤铁矿）或铁磁性矿物（磁赤铁矿和磁铁矿），提高了整体选矿回收率。然后通过在 0.25 M HCl 中浸出去除最终产品中的磷 (P) 含量。浸出过程中最终精矿的铁损为 0.78%，可以忽略不计。总体而言，最终浓缩物的 TFE 含量为 61.78%，回收率为 94.97%，P 含量为 0.04%，去除率为 94.73%，为工业使用提供了令人满意的结果。该研究为未来可能的研究提供了一种替代方法，以从有问题的铁矿石中生产具有高回收率的铁精矿，可根据其 P 含量对其进行分类。