Silica and Iron Recovery from a Residue of Iron Ore Flotation

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DOI: 10.4236/jmmce.2017.54013    1,919 Downloads   4,800 Views  Citations

ABSTRACT

A study of silica and iron recovery from the iron ore concentration tailing is presented. The residue is composed of 40.1% Fe, 33.4% SiO2, 8.31% Al2O3, 0.08% P, and 0.34% MnO. The developed process of silica and iron recovery consisted of size classification, magnetic separation, and removal of impurities by leaching. A concentration of SiO2 from 33.4% to 67.0%, with 60.0% of mass reduction, was achieved by size classification. After magnetic separation, the SiO2 grade increased from 67.0% to 95.0%, in non-magnegtic fraction and iron increased from 40.1% to 60.2% in magnetic fraction. The iron content in magnetic fraction achieved the commercial grade. In order to increase the content of silica, the impurities removal from the non-magnetic fraction was studied. The leaching agents investigated were HCl, H2SO4, HNO3, HF, C6H8O7, (COOH)2.2H2O and NaOH. A concentration of 98.0% SiO2 was attained with the acid digestion.

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Martins, P. , Morais, C. , Lameiras, F. and Albuquerque, R. (2017) Silica and Iron Recovery from a Residue of Iron Ore Flotation. Journal of Minerals and Materials Characterization and Engineering, 5, 153-160. doi: 10.4236/jmmce.2017.54013.

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