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Preparation of Fe–Ni Alloy Containing Low Cr and Ti from Red Mud Through Molten Salt Electrolysis

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Abstract

The paper reports the preparation of iron–nickel alloy with low chromium (Cr) and titanium (Ti) from pre-treated red mud through molten salt electrolysis. The pre-treatment of red mud involves the heat treatment of red mud with Na2CO3 in a graphite crucible at a temperature of 1000 °C for 1 h followed by water leaching and drying. The electrolysis of pre-treated red mud is carried out in a molten CaCl2 bath at a temperature of 1000 °C taking heat-treated red mud as cathode and graphite as anode. The electrolysis of pre-treated red mud is carried out at a constant cell voltage of 3 V for 1 h in a molten CaCl2 bath at a temperature of 1000 °C to produce the iron–nickel alloy containing low chromium and titanium. The partially metalized phases (α-Fe, CrTi and NiTi) present in the pre-treated red mud accelerate the cathodic reduction during molten salt electrolysis to produce the said alloy and ultimately decrease the time period of electrolysis.

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Acknowledgements

The authors acknowledge Science and Engineering Research Board, DST, Govt. of India, for financial sanction (Sanction Order No. SB/FT/CS-135/2014) to carry out the work. The author also acknowledges STIC, Cochin University of Science and Technology, Kerala, India, for characterizing the samples.

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  1. Department of Chemistry, C. V. Raman College of Engineering, Mahura, Janla, 752054, Odisha, India

    Jayashree Mohanty & Rama Chandra Muduli

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  1. Jayashree Mohanty
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  2. Rama Chandra Muduli
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Correspondence to Jayashree Mohanty.

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Mohanty, J., Muduli, R.C. Preparation of Fe–Ni Alloy Containing Low Cr and Ti from Red Mud Through Molten Salt Electrolysis. J. Inst. Eng. India Ser. C 101, 401–406 (2020). https://doi.org/10.1007/s40032-019-00543-9

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