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Study on magnetic concentration of Nigerian Itakpe sinter concentrate to a Midrex-grade concentrate

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Author(s): Adewale O. Adeleke

Journal: Maejo International Journal of Science and Technology
ISSN 1905-7873

Volume: 3;
Issue: 03;
Start page: 400;
Date: 2009;
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Keywords: Itakpe iron ore | magnetic separation | Midrex-grade concentrate

ABSTRACT
The sinter grade of the Nigerian Itakpe iron ore that assayed 63.63% Fe and 6.62% total acid gangue was subjected to both wet low-intensity magnetic separation (LIMS) and wet high-intensity magnetic separation (WHIMS) to upgrade it to Midrex-grade super-concentrate. Chemical analysis conducted on the super-concentrate samples from LIMS and WHIMS gave Fe content of 67.59% and 68.70%, and lower acid gangue of 1.55% and 3.22% respectively. However, screen distribution analysis results showed that the cumulative fractions passing 45-m sieve were 0.88% and 0.38% for LIMS and WHIMS super-concentrates respectively. These results indicate that the Fe and acid content determined for both LIMS and WHIMS meets the requirement for a Midrex-grade super-concentrate, while the fractions of the concentrate passing 45-m sieve are below the 30% upper limit for transportation to the reduction plant.
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