Abstract
In recent years, a new process for leaching scheelite concentrates with sulfur-phosphorus mixed acid has been successfully industrialized. This process suffers from the elimination of the retarding effect of calcium sulfate, the selective extraction of tungsten from the H3PW12O40-H2SO4-H3PO4 mixture solution, and the removal of introduced phosphorus. Therefore, in this paper, we investigated the inhibition measures of a calcium sulfate-blocking membrane, the selective extraction of tungsten by ion exchange, and the removal of phosphorus by the magnesium ammonium salt method. The results showed that the addition of calcium sulfate whisker seeds and a higher H3PO4 concentration inhibited spontaneous diffuse nucleation, promoted crystal growth, and avoided the formation of a dense blocking film. About 98 wt.% of the scheelite concentrate was digested by H2SO4-H3PO4. The selective adsorption of PW12O403− was realized using D301 resin, and the extraction efficiency of tungsten exceeded 99.9%. After desorption with ammonia water, PW12O403− was depolymerized into WO42− and PO43−. 99.9 wt.% of phosphorus was removed in the form of MgNH4PO4 by the magnesium ammonium salt method, and the residual phosphorus concentration in the solution was lower than 10 mg·L−1. After purification, the highest-grade ammonium paratungstate product was prepared by evaporative crystallization.
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Acknowledgements
This work was jointly supported by the National Natural Science Foundation of China (No. 51334008), the Basic Science Center of the National Natural Science Foundation of China (72088101), and the National Key Research and Development Program of China (No. 2022YFC2904505).
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Li, JT., Gao, LL., Zhao, ZW. et al. Efficient recovery of tungsten from scheelite concentrates using a sulfur-phosphorus mixed acid leaching system. Tungsten (2024). https://doi.org/10.1007/s42864-024-00265-1
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DOI: https://doi.org/10.1007/s42864-024-00265-1