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Reduction Roasting Followed by Pelletization Study of Concentrate Fines of a Low Grade Iron Ore

  • Thematic Section: New Approaches for Sustainable Steel Production and Processing
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Abstract

Utilizing iron ore mining wastes like dump fines, slimes, and tailings, which contain significant iron values, is essential to meet future needs and environmental sustainability, requiring intensive research to develop a process that can identify the route for sustainable usage. Reduction roasting is a proven route for converting and recovering high-grade iron value from low-grade iron ore (LGIO) resources. However, the further step is pelletization, by which these concentrated fines can be utilized for iron and steel making. This experimental investigation summarized the utilization of (LGIO) fines containing goethite to obtain high-grade iron ore pellets where the waste fines were earlier undergone reduction roasting and magnetic separation. The LGIO fines assayed 53.19% TFe, collected from Barbil, Odisha region, a mining waste dumped at the mine site. The reduction roasting experiments were designed using Taguchi's L9 experiment design and performed in a lab-scale muffle furnace. After magnetic separation, the magnetite obtained from the roasted sample underwent a pelletization study. The optimum roasting temperature and time were found to be 900 °C and 30 min, resulting in maximum yield and recovery, 70.4% and 84.2%, respectively, from the roasting experiments. The pellet produced from optimum roasting temperature and time possessed 310.6 kg/pellet Cold Compressive Strength (CCS) and 31.8% porosity, having 63.13% TFe at 1220 °C induration temperature and 5 min retention time.

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Abbreviations

LGIO:

Low grade iron ore

TFe:

Fe total, Fe(T)

RFe:

Fe recovery

CCS:

Cold compressive strength

SFCA:

Silico-ferrite of calcium and aluminum

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Acknowledgments

The authors thank Dr. Pallishree Prusti (Principal Scientist, CSIR-IMMT, Bhubaneswar, India) for his extended support for the pelletization study. They also acknowledge the help of Dr. Binod Behari Palei (Principal Technical Officer, CSIR-IMMT, Bhubaneswar, India) and the Central Characterization Department (CSIR-IMMT, Bhubaneswar, India) for the characterization study. The authors also extend their regards to the Head of the Mineral Processing Department and the Director, CSIR-IMMT, Bhubaneswar, for permission to conduct this research work. Moreover, the authors extend their regards to CSIR-HQ, New Delhi, for the Financial Grant.

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Authors and Affiliations

  1. CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, 751013, India

    Subhabrata Mishra, Jyotirmayee Mahanta, Sibangi Rath, Madhusmita Baliarsingh & Prabhas Chandra Beuria

  2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India

    Subhabrata Mishra, Jyotirmayee Mahanta, Madhusmita Baliarsingh & Prabhas Chandra Beuria

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  1. Subhabrata Mishra
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  2. Jyotirmayee Mahanta
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Contributions

SM: Conceptualization, investigation, writing original draft, and editing. JM: Data analysis, writing the original draft, and editing. SR: Investigation. MB: Investigation. PCB: Supervision and reviewing.

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Correspondence to Subhabrata Mishra or Prabhas Chandra Beuria.

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The contributing editor for this article was Yan Ma.

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Mishra, S., Mahanta, J., Rath, S. et al. Reduction Roasting Followed by Pelletization Study of Concentrate Fines of a Low Grade Iron Ore. J. Sustain. Metall. (2024). https://doi.org/10.1007/s40831-024-00828-z

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