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Iron and Nickel Enrichment in Low Grade Chromite Overburden to Produce Ferronickel Alloys

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Abstract

Chromite overburden (COB), considered as a waste material with 46% Fe and 0.8% Ni, is the only source of nickel in India. Iron and nickel from COB were recovered through reduction roasting, magnetic separation and smelting. In sintering, maximum Ni% was achieved at 1.0% S, 10% C inside and 10% C outside of the COB pellet. Ni was, further, enriched by smelting the magnetic fraction of sintered COB. XRD, SEM–EDS and chemical analysis of the feed material and products confirmed enriched Ni content in the ferronickel alloy. With the optimized parameters such as 12 min time, 1.2 basicity and 10% reductant, ferronickel alloy contains 8% Ni and 89% Fe with recovery of 87% Ni. It was possible to produce different grades of ferronickel, varying from 2 to 10% Ni.

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Acknowledgement

The authors would like to thank the Director, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar for the support to publish this work. We also thank Ministry of Mines, India for their financial support to carry out the research work and Kiran Lata Bhaskar expresses her gratefulness to Academy of Scientific & Innovative Research.

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Authors and Affiliations

  1. Academy of Scientific & Innovative Research, IMMT, Bhubaneswar, Odisha, India

    Kiran Lata Bhaskar

  2. Advanced Materials Technology Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, Odisha, India

    Kiran Lata Bhaskar & Bhagyadhar Bhoi

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  1. Kiran Lata Bhaskar
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  2. Bhagyadhar Bhoi
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Correspondence to Bhagyadhar Bhoi.

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Bhaskar, K.L., Bhoi, B. Iron and Nickel Enrichment in Low Grade Chromite Overburden to Produce Ferronickel Alloys. Trans Indian Inst Met 74, 1321–1332 (2021). https://doi.org/10.1007/s12666-020-02176-4

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