Abstract
Tungsten was recovered from sulfuric–phosphoric acid leach solution of scheelite using 2-octanol and tributyl phosphate (TBP). Approximately 76% of the tungsten and less than 6.2% of the iron were extracted when using 70% 2-octanol, showing good selectivity for tungsten over iron; the tungsten extraction could not be significantly enhanced using a three-stage countercurrent simulation test. Moreover, more than 99.2% of the W and 91.0% of the Fe were extracted when using 70% TBP, showing poor selectivity, but after pretreating the leach solution with iron powder, less than 5.5% of the Fe was extracted. The loaded phases were stripped using deionized water and ammonia solution. The maximum strip** rate of tungsten from loaded 2-octanol was 45.6% when using water, compared with only 13.1% from loaded TBP. Tungsten was efficiently stripped from loaded phases using ammonia solution without formation of Fe(OH)3 precipitate. Finally, a flow sheet for recovery of tungsten with TBP is proposed.
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Acknowledgements
This work is financially supported by the National Natural Science Foundation of China (No. 51334008). We thank **amen Tungsten Co., Ltd., China for provision of leach solution.
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Liao, Y., Zhao, Z. Comparison of 2-Octanol and Tributyl Phosphate in Recovery of Tungsten from Sulfuric–Phosphoric Acid Leach Solution of Scheelite. JOM 70, 581–586 (2018). https://doi.org/10.1007/s11837-018-2763-x
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DOI: https://doi.org/10.1007/s11837-018-2763-x