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Magnetizing roast and magnetic separation of iron in rare-earth tailings

  • Materials, Metallurgy, Chemical and Environmental Engineering
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Abstract

Magnetic separation of iron in rare-earth tailings was achieved by magnetizing roast process with coal as reductant. Effects of the temperature, carbon to oxygen ratio, and cooling type on magnetic susceptibility and composition of rare-earth tailings were investigated. The results show that roast conditions with the temperature of 650 °C, carbon to oxygen ratio of 3.85, and holding time of 2.5 h are in favor of reduction of Fe2O3 to Fe3O4 when the roasted rare-earth tailings is cooled along with furnace. Under these roast conditions, magnetic susceptibility of rare-earth tailings is 2.36 that is very close to theoretical value (2.33). However, magnetic separation results of iron in rare-earth tailings cooled along with furnace are not satisfactory. Through comparing magnetic separation results of iron in rare-earth tailings cooled by different ways, it is found that water cooling is more favored of magnetic separation of iron in the roasted rare-earth tailings than furnace cooling and air cooling. Grade and recovery of iron in concentrate from rare-earth tailings cooled by water are 45.00%-49.00% and 65.00%-77.50%, respectively.

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    He Yang  (杨合), Yi Rong  (荣宜), Chong Han  (韩冲), Rong Tang  (唐荣), Xiang-xin Xue  (薛向欣), Yong Li  (李勇) & Ying-nan Li  (李英楠)

Authors
  1. He Yang  (杨合)
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  2. Yi Rong  (荣宜)
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  3. Chong Han  (韩冲)
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  4. Rong Tang  (唐荣)
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  5. Xiang-xin Xue  (薛向欣)
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  6. Yong Li  (李勇)
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  7. Ying-nan Li  (李英楠)
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Corresponding author

Correspondence to He Yang  (杨合).

Additional information

Foundation item: Project(2012CBA01205) supported by National Basic Research Program of China, Projects(50934004, 51274061) supported by the National Natural Science Foundation of China; Project(N110502002) supported by the Fundamental Research Funds for the Central Universities, China

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Yang, H., Rong, Y., Han, C. et al. Magnetizing roast and magnetic separation of iron in rare-earth tailings. J. Cent. South Univ. 23, 1899–1905 (2016). https://doi.org/10.1007/s11771-016-3245-3

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  • DOI: https://doi.org/10.1007/s11771-016-3245-3

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