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Separation and purification of tantalum from plumbomicrolite of amazonite deposit in Kola Peninsula by acid leaching and solvent extraction

酸浸法和溶剂萃取法分离提纯 Kola Peninsula 铅细晶矿中的钽

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Abstract

A plumbomicrolite concentrate (PMC) was leached with the mixture of HF and H2SO4, HF and HNO3 acids, respectively. Optimal conditions ensuring high recovery of tantalum and niobium (up to 99%) into solution, and radionuclides into insoluble residue were determined. Fluoride-sulfuric acid and fluoride-nitric acid schemes were proposed for PMC leaching by an extractive separation of tantalum form niobium, lead and impurities, and production of high-purity tantalum compounds. Octanol-1 was used as an extractant. Optimal conditions for production of high-purity tantalum strip solutions were defined for all stages (extraction-scrubbing-stripping). Produced tantalum compounds, such as tantalum pentoxide and potassium heptafluotanthalate, comply with the norms for high-purity substances in terms of impurities content. Final choice of the PMC processing scheme is determined by its profitability.

摘要

采用了氢氟酸和硫酸、 氢氟酸和硝酸的混合酸浸出法, 对铅细晶矿进行了浸取分离。 在最佳条件下, 钽和铌的收率达到 99%, 同时并确保放射性核素留在不溶性残渣中。 提出了采用氟酸-硫酸和氟酸-硝酸萃取分离钽与铌、 铅和杂质的浸出方案, 并生产高纯钽化合物。 确定了辛醇-1 作为萃取剂, 反萃生产高纯钽的各阶段萃取-洗涤-反萃的最佳条件。 生产出的钽化合物, 如五氧化二钽和七氟戊二酸钾, 杂质含量符合高纯物质的标准。

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Authors and Affiliations

  1. Tananaev Institute of Chemistry - Subdivision of the Federal Research Centre, Kola Science Centre of the Russian Academy of Sciences, Apatity, 184209, Russia

    S. M. Masloboeva, L. G. Arutyunyan, M. N. Palatnikov & D. V. Manukovskaya

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  1. S. M. Masloboeva
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  2. L. G. Arutyunyan
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  3. M. N. Palatnikov
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  4. D. V. Manukovskaya
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Correspondence to D. V. Manukovskaya.

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The authors declare no conflict of interest.

Data availability statement

The raw data required to reproduce our findings are available in Ref. [35].

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Project supported by the Federal Research Centre of Kola Science Centre of the Russian Academy of Sciences, Russian

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Masloboeva, S.M., Arutyunyan, L.G., Palatnikov, M.N. et al. Separation and purification of tantalum from plumbomicrolite of amazonite deposit in Kola Peninsula by acid leaching and solvent extraction. J. Cent. South Univ. 28, 72–88 (2021). https://doi.org/10.1007/s11771-021-4587-z

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