4.7 Article

Application of suspension magnetization roasting as technology for high-efficiency separation of valuable iron minerals from high-iron bauxite

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ELSEVIER
DOI: 10.1016/S1003-6326(22)65955-7

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high-iron bauxite; suspension magnetization roasting; comprehensive utilization; magnetic separation; phase transformation

资金

  1. National Natural Science Foundation of China [51904058, 52174240]
  2. Fundamental Research Funds for the Central Universities, China [2101023]

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A suspension magnetization roasting-magnetic separation technology was proposed for the recovery of iron minerals. The optimized parameters achieved a high separation efficiency.
A technology for suspension magnetization roasting-magnetic separation was proposed to separate iron minerals for recovery. The optimum parameters were as follows: a roasting temperature of 650 degrees C, a roasting time of 20 min, a CO concentration of 20%, and particles with a size less than 37 mu m accounting for 67.14% of the roasted product. The total iron content and iron recovery of the magnetic concentrate were 56.71% and 90.50%, respectively. The phase transformation, magnetic transition, and microstructure evolution were systematically characterized through iron chemical phase analysis, X-ray diffraction, vibrating sample magnetometry, X-ray photoelectron spectroscopy, and transmission electron microscopy. The results demonstrated the transformation of hematite to magnetite, with the iron content in magnetite increasing from 0.41% in the raw ore to 91.47% in the roasted product.

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