Electrochemical preparation of the Fe–Ni36 Invar alloy from a mixed oxides precursor in molten carbonates

Yan-peng Dou; Di-yong Tang; Hua-yi Yin; Di-hua Wang

doi:10.1007/s12613-020-2169-y

Volume 27 Issue 12

Dec. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(12): 1695-1702

Yan-peng Dou, Di-yong Tang, Hua-yi Yin, and Di-hua Wang, Electrochemical preparation of the Fe–Ni36 Invar alloy from a mixed oxides precursor in molten carbonates, Int. J. Miner. Metall. Mater., 27(2020), No. 12, pp. 1695-1702. https://doi.org/10.1007/s12613-020-2169-y

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Yan-peng Dou, Di-yong Tang, Hua-yi Yin, and Di-hua Wang, Electrochemical preparation of the Fe–Ni36 Invar alloy from a mixed oxides precursor in molten carbonates, Int. J. Miner. Metall. Mater., 27(2020), No. 12, pp. 1695-1702. https://doi.org/10.1007/s12613-020-2169-y

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Research Article

Electrochemical preparation of the Fe–Ni36 Invar alloy from a mixed oxides precursor in molten carbonates

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Corresponding author:
Di-hua Wang E-mail: wangdh@whu.edu.cn
Received: 31 May 2020; Revised: 14 August 2020; Accepted: 17 August 2020; Available online: 20 August 2020

Abstract

Abstract

The Fe–Ni36 alloy was prepared via the one-step electrolysis of a mixed oxides precursor in a molten Na₂CO₃–K₂CO₃ eutectic melt at 750°C, where porous Fe₂O₃–NiO pellets served as the cathode and the Ni10Cu11Fe alloy was an inert anode. During the electrolysis, NiO was preferentially electro-reduced to Ni, then Fe₂O₃ was reduced and simultaneously alloyed with nickel to form the Fe–Ni36 alloy. Different cell voltages were applied to optimize the electrolytic conditions, and a relatively low energy consumption of 2.48 kW·h·kg⁻¹ for production of FeNi36 alloy was achieved under 1.9 V with a high current efficiency of 94.6%. The particle size of the alloy was found to be much smaller than that of the individual metal. This process provides a low-carbon technology for preparing the Fe–Ni36 alloy via molten carbonates electrolysis.
- molten carbonates;
- cyclic voltammetry;
- electro-reduction;
- inert anode;
- Invar36 alloy

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References

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