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High‐efficiency preparation of Fe–Al based flocculants from red mud by microwave selective carbothermic reduction and magnetic separation
Author(s) -
Zhang Junhong,
Guo Qing,
Tian Chen,
Zhan Wenlong,
Chen Shuwen,
He Zhijun
Publication year - 2020
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13466
Subject(s) - red mud , flocculation , magnetite , microwave , magnetic separation , materials science , sewage , reduction (mathematics) , turbidity , microwave digestion , chemical engineering , chemistry , waste management , metallurgy , chromatography , geology , computer science , telecommunications , engineering , oceanography , geometry , mathematics , detection limit
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.