High-efficiency preparation of Fe-Al based flocculants from red mud by microwave selective carbothermic reduction and magnetic separation

摘要

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.