Journal
HYDROMETALLURGY
Volume 191, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.hydromet.2019.105219
Keywords
Antimony; Tellurium; Tellurium-bearing alkaline skimming slag; Hydrogen peroxide; Sodium sulfide; Sodium sulfite
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Funding
- National Natural Science Foundation of China [51604303]
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Sb and Te in Te-bearing alkaline skimming slag were extracted into a leach solution using a two-stage sodium sulfide leaching process. In this study, a possible method for selective recovery of Sb and Te from the sodium sulfide leach solution by drop-wise H2O2 addition followed by Na2S-Na2SO3 precipitation was developed. 99% of Sb was precipitated selectively at 50 degrees C for 100 min with addition of 90 mL H2O2 while Te precipitation was near-zero. Te in the oxidized solution was converted to the form of TeS42- with Na2S, and recovered by Na2SO3 reduction. The results indicated that 95% of Te was precipitated under the optimum conditions: 1.0 of Na2S excess coefficient, 1.75 of Na2SO3 excess coefficient, 50 degrees C of temperature and 30 min of time. XRD pattern and chemical analysis indicated that the H2O2 oxidation precipitate was NaSb(OH)(6) with Sb content of 46.92% and the Na2S-Na2SO3 precipitate was elemental Te with a purity of 98.61%.
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