Abstract
Copper telluride slag from copper smelting process is an important source of tellurium (Te). In this work, an efficient and economical hydrometallurgical process for extracting Te from copper telluride slag was proposed. First, H2SO4 and NaClO3 were demonstrated to be effective for separating Te and Cu, and the leaching efficiency of Cu(II) reached 99.44 pct, while that of Te(IV) was only 3.00 pct. Tellurium oxide in the oxidative acid leaching residue was dissolved in NaOH solution, and Na2S was added as precipitant to purify alkali leaching solution. Valuable metals (Bi, Se, Pb, Sb, Ag, Au) were enriched in alkaline leaching residue. Furthermore, the separation of Te and Se was realized by adding H2O2 in alkali leaching solution, the precipitation efficiency of Te(VI) was up to 99.43 pct. Finally, Te(VI) was reduced by Na2S-Na2SO3, and the reduction efficiency was 99.85 pct under optimized conditions. The results show that 96.18 pct of Te can be extracted as elemental Te powder with a purity of 99.98 pct, indicating that the process achieves an efficient extraction efficiency of Te from copper telluride slag.
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This work was financially supported by the National Natural Science Foundation of China (No. 51374185).
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Shen, Y., Xu, S., Feng, W. et al. An Efficient Hydrometallurgical Process for Extracting Tellurium From Copper Telluride Slag. Metall Mater Trans B 53, 2838–2851 (2022). https://doi.org/10.1007/s11663-022-02568-5
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DOI: https://doi.org/10.1007/s11663-022-02568-5