Abstract
This study investigates the utilization of low-grade banded iron ore for its utilization as a blast furnace feedstock. The complex association of the quartz-hematite phase and a fine liberation size prohibits the direct use of these ores in the steel production cycle. Conventional reduction experiments using different reductants yielded limited iron enrichment. Microwave carbothermal reduction using economical and abundantly available groundnut shell was investigated using a Taguchi L9 statistical design. The design optimal condition of 900W power, 20 min time and 3% equivalent carbon yielded an enriched iron concentrate with Fe 58% at 85.6% recovery. Characterization studies reveal the formation of sequential hematite, magnetite and wustite formation with groundnut shell dosage. The concentrate obtained can be used as feedstock for blast furnace burden. Microwave reduction was found better in terms of product control than conventional reduction, as fayalite formation was not observed.
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