4.7 Article

Recovery of iron from high-iron red mud using suspension magnetization roasting and magnetic separation

期刊

MINERALS ENGINEERING
卷 178, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2022.107394

关键词

High-iron red mud; Alumogeothite; Suspension magnetization roasting; Phase transformation; Magnetic separation

资金

  1. National Key Research and Development Program of China [2018YFC1901902]
  2. Fundamental Research Funds for the Central Universities [N182508026]

向作者/读者索取更多资源

An innovative suspension magnetization roasting followed by magnetic separation process was developed to recover iron from high-iron red mud. Under the optimized conditions, an iron concentrate with high purity and recovery rate was obtained. The suspension magnetization roasting converted hematite into magnetite, improving the magnetism, and also allowed hematite and alumina to enter the iron concentrate, increasing the aluminum content.
An innovative suspension magnetization roasting followed by magnetic separation process was developed to recover iron from high-iron red mud (HIRM), and the effects of roasting temperature, roasting time, CO concentration and grinding fineness on the recovery of iron were investigated. Under the optimized conditions, determined to be a roasting temperature of 560 degrees C, reaction time of 15 min, CO concentration of 30% and total gas-flow rate of 500 mL/min, an iron concentrate assaying 55.44 wt% Fe with an iron recovery of 89.34% was prepared by magnetic separation. X-ray diffraction, chemical phase analysis, vibrating sample magnetometer, and scanning electron microscope were employed to assess the characteristics of red mud, roasted sample and magnetic separation products. The hematite in the red mud was transformed into magnetite during the suspension magnetization roasting, thus the magnetism was significantly enhanced. While, the alumogoethite was transformed into Fe-Al spinel phase Fe(Al,Fe)(2)O-4, and entered the magnetic concentrate along with the magnetite. In addition, some fine-grained alumina particles were also easy to be wrapped by magnetic agglomerates and entered the magnetic concentrate, resulting in high aluminum content in the iron concentrate.

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