Fe–Al based flocculants (PAFC) have been widely used in sewage treatment. In this article, a new method for preparing PAFC from red mud was proposed, the magnetic product was upgraded and “downgrading Fe of red mud” was obtained based on a microwave selective carbothermic reduction and magnetic separation technique. The results showed that the Fe and Al contents in “downgrading Fe of red mud” were determined to be 24.60% and 22.27%, respectively. The Fe and Al digestion rates of “downgrading Fe of red mud” were 81.24% and 28.55% during the preparation of PAFC, respectively. The prepared PAFC can effectively achieve the effect of sewage treatment, and the turbidity removal rate of sewage reached 88.17%. In addition, microwave can realize rapid reduction at low temperature, and the magnetite obtained by magnetic separation can be used in the iron‐making process to realize the recycling of resources.

中文翻译：

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微波选择性碳热还原和磁分离从赤泥中高效制备铁铝基絮凝剂

铁铝基絮凝剂（PAFC）已广泛用于污水处理。本文提出了一种利用赤泥制备PAFC的新方法，通过微波选择性碳热还原和磁选技术，对磁性产品进行了提纯，并获得了“降级赤泥中的Fe”。结果表明，“降级赤泥铁”中的Fe和Al含量分别为24.60％和22.27％。在制备PAFC时，“降解赤泥铁”的Fe和Al消化率分别为81.24％和28.55％。所制备的PAFC可以有效地达到污水处理的效果，污水的浊度去除率达到88.17％。另外，微波可以实现低温下的快速还原，