Activity coefficient of NiO in SiO2-saturated MnO–SiO2 slag and Al2O3-saturated MnO–SiO2–Al2O3 slag at 1623 K

Guoxing Ren; Songwen Xiao; Caibin Liao; Zhihong Liu

doi:10.1007/s12613-020-2205-y

Volume 29 Issue 2

Feb. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(2): 248-255

Guoxing Ren, Songwen Xiao, Caibin Liao, and Zhihong Liu, Activity coefficient of NiO in SiO₂-saturated MnO–SiO₂ slag and Al₂O₃-saturated MnO–SiO₂–Al₂O₃ slag at 1623 K, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 248-255. https://doi.org/10.1007/s12613-020-2205-y

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Guoxing Ren, Songwen Xiao, Caibin Liao, and Zhihong Liu, Activity coefficient of NiO in SiO2-saturated MnO–SiO2 slag and Al2O3-saturated MnO–SiO2–Al2O3 slag at 1623 K, Int. J. Miner. Metall. Mater., 29(2022), No. 2, pp. 248-255. https://doi.org/10.1007/s12613-020-2205-y

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Research Article

Activity coefficient of NiO in SiO₂-saturated MnO–SiO₂ slag and Al₂O₃-saturated MnO–SiO₂–Al₂O₃ slag at 1623 K

+ Author Affiliations

Corresponding authors:
Songwen Xiao E-mail: zhliu@csu.edu.cn

Zhihong Liu E-mail: zhliu@csu.edu.cn
Received: 18 May 2020; Revised: 28 September 2020; Accepted: 30 September 2020; Available online: 1 October 2020

Abstract

Abstract

As a part of the fundamental study related to the reduction smelting of spent lithium-ion batteries and ocean polymetallic nodules based on MnO–SiO₂ slags, this work investigated the activity coefficient of NiO in SiO₂-saturated MnO–SiO₂ slag and Al₂O₃-saturated MnO–SiO₂–Al₂O₃ slag at 1623 K with controlled oxygen partial pressure levels of 10⁻⁷, 10⁻⁶, and 10⁻⁵ Pa. Results showed that the solubility of nickel oxide in the slags increased with increasing oxygen partial pressure. The nickel in the MnO–SiO₂ slag and MnO–SiO₂–Al₂O₃ slag existed as NiO under experimental conditions. The addition of Al₂O₃ in the MnO–SiO₂ slag decreased the dissolution of nickel in the slag and increased the activity coefficient of NiO. Furthermore, the activity coefficient of NiO (γ_NiO), which is solid NiO, in the SiO₂ saturated MnO–SiO₂ slag and Al₂O₃ saturated MnO–SiO₂–Al₂O₃ slag at 1623 K can be respectively calculated as γ_NiO = 8.58w(NiO) + 3.18 and γ_NiO = 11.06w(NiO) + 4.07, respectively, where w(NiO) is the NiO mass fraction in the slag.
- nickel;
- equilibrium;
- MnO–SiO₂ slag;
- MnO–SiO₂–Al₂O₃ slag;
- activity coefficient;
- spent lithium-ion batteries recovery;
- polymetallic nodules

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References

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