Evaluation of groundnut shell as a reductant for microwave reduction of low grade banded iron ore

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 experime...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-11, Vol.641 (1), p.12008
Main Authors: Rayapudi, V, Dhawan, N
Format: Article
Language:English
Subjects:
Concentrates (ores)
Fayalite
Groundnuts
Hematite
Iron compounds
Iron ores
Raw materials
Reducing agents
Steel production
Wustite
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Summary: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.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/641/1/012008