Abstract
The method of red uction roasting a nd magnetic separatio n of low- grade, micro- fine disseminated refractory iron ore following granulation with coal produced unexpected success. Pellets of iron ore with diameter between 3 and 8mm were granulated with coal, bentonite and water. The raw pellets a nd reduction products were analyzed by scanning electron microscopy and x-ray diffraction. Results show uniformly distributed coal powders inside the pellets improved the kinetics of the reduction process and accelerated the reduction rate. Reduction time was higher at temperatures below 890°C, which resulted in the formation of substantial amounts of fayalite. When temperature was increased, micro-fine hematite was then quickly reduced to iron metal a nd the amount of fayalite decreased sharply. When pellets were reduced at 950°C for 25min, reduc tion products with 56.73% metallization rate were obtained. After grinding and magnetic separation, a concentrate with 72.18% Fetot was obtained.
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© 2015 TMS (The Minerals, Metals & Materials Society)
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Huang, Z., Zhong, R., Zou, J., Jiang, T. (2015). Effect of Temperature on Reduction Roasting of Low-Grade Iron Ore after Granulating with Coal. In: Battle, T.P., et al. Drying, Roasting, and Calcining of Minerals. Springer, Cham. https://doi.org/10.1007/978-3-319-48245-3_23
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DOI: https://doi.org/10.1007/978-3-319-48245-3_23
Publisher Name: Springer, Cham
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