A novel process for extraction of iron from a refractory red mud
Wei Ding 1,   Junhui Xiao 1  
,   Yang Peng 1,   Siyue Shen 1,   Tao Chen 1,   Kai Zou 1,   Zhen Wang 1
 
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SWUST
CORRESPONDING AUTHOR
Junhui Xiao   

SWUST
Publication date: 2020-09-07
 
Physicochem. Probl. Miner. Process. 2020;56(In honour to Professor Zygmunt Sadowski 6):125–136
 
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ABSTRACT
Red mud is a kind of solid waste produced during alumina extraction from bauxite. To extraction valuable iron from red mud, the technology of adding sodium sulfate-segregation roasting-magnetic separation to treat red mud was developed. During the paper, the effects of various process parameters on the extraction of iron by segregation roasting-magnetic separation were studied, and the phase transformation behavior and microstructure of iron are explored. Repeated test results showed that magnetic concentrate (mass percent), TFe of 80.29 % and overall iron recovery of 92.08 %was obtained. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results indicated that after the segregation roasting, the hematite was transformed into a new metal phase consisting mainly of metallic iron and magnetite. The addition of sodium sulfate during the segregation roasting can obviously improve the efficiency of segregation roasting-magnetic separation for iron extraction.
eISSN:2084-4735
ISSN:1643-1049