Abstract
In this study, magnesia–nickel silicate ore was investigated, which contained 0.83% Ni and antigorite, chlorite, magnetite (Fe3O4), quartz, and mica as the main minerals. Chloride roasting and magnetic separation were used to treat the ore. The addition of red mud enhanced the transformation of nickel silicate to a strongly magnetic mineral mainly comprising metallic Ni and that of hematite to Fe3O4 and metallic Fe. Test results showed that a Ni concentrate with a Ni content of 11.41% and Ni recovery of 92.77% was achieved under the following optimal conditions: roasting temperature: 1373.15 K; roasting time: 120 min; CaCl2 dosage: 20%; coke dosage: 14%; red mud dosage: 30%; magnetic field intensity = 0.14 T; and grinding fineness: 90% < 0.05 mm. The major minerals in the Ni concentrate were Fe3O4, metallic Fe, and metallic Ni. Sc entered the magnetic separation tailings, creating a favorable condition for the further extraction of Sc by hydrometallurgy. The thermodynamic calculation results are in good agreement with the test results.
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Acknowledgements
This work was funded by the Research Fund Program of Innovation Center of Rare Earth Resources Development and Utilization, China Geological Survey (Grant No. 2021XTZX01), the Sichuan Science and Technology Program (Grant Nos. 2021YJ0057, 2021YFG0268, 2019FS0451, and 2019FS0452), Key Laboratory of Guangdong Provincial Key Laboratory of Radioactive and Rare Resource Utilization (Grant No. 2018B030322009), and the Research Fund Program of Key Laboratory of Sichuan Province for Comprehensive Utilization of Vanadium and Titanium Resources Foundation (Grant No. 2018FTSZ35).
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Xiao, J., Xiong, W., Zou, K. et al. Extraction of Nickel from Magnesia–Nickel Silicate Ore. J. Sustain. Metall. 7, 642–652 (2021). https://doi.org/10.1007/s40831-021-00364-0
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DOI: https://doi.org/10.1007/s40831-021-00364-0