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Experimental Investigation on Preparation of NaMgF3 and MgF2 from the Leaching Solution of SPL

  • Pyrometallurgical Techniques Driving Recycling and the Circular Economy
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Abstract

Generally, there is a large amount of sodium fluoride in the spent potlining of aluminum electrolysis (SPL), which is a high-value fluorine resource. Therefore, recycling the fluorine resource from SPL is of profound significance, which not only saves the primary fluorine resource but also reduces energy consumption and carbon emissions. In this paper, co-precipitation method for the preparation of NaMgF3 and MgF2 was explored by using the leaching solution of SPL as raw material and magnesium sulfate as reagent. The results showed that the decisive factor for the type of product was the molar ratio of magnesium ion to fluorion (M/F) rather than the reaction temperature and holding time. When M/F is < 0.33, the product was mainly NaMgF3. When M/F increased further to 0.33–0.81, MgF2 was gradually produced, and the product was a mixture of NaMgF3 and MgF2. When M/F exceeded 0.81, the product was mainly MgF2.

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Acknowledgements

Authors are grateful for the support from the Scientific Research Development Foundation Fund of Zhengzhou University (25124510001) and the Key Research Project of Henan Province (212102311161).

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  1. School of Material Science and Engineering, Zhengzhou University, Zhengzhou, 450001, Henan, China

    Hongwei Xuan, ** Chen, Na Li & Weidong Zhao

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  1. Hongwei Xuan
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    Correspondence to **** Chen.

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    Xuan, H., Chen, X., Li, N. et al. Experimental Investigation on Preparation of NaMgF3 and MgF2 from the Leaching Solution of SPL. JOM 75, 3480–3488 (2023). https://doi.org/10.1007/s11837-023-05995-0

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    • DOI: https://doi.org/10.1007/s11837-023-05995-0

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