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- Title
Selenium Leaching from Copper Anode Slimes Using a Nitric Acid-Sulfuric Acid Mixture.
- Authors
Li, Xue-jiao; Yang, Hong-ying; Jin, Zhe-nan; Tong, Lin-lin; Xiao, Fa-xin
- Abstract
Based on the Eh-pH diagram for the Se-HO system, a new method is proposed for leaching selenium from copper anode slimes using a nitric acid-sulfuric acid mixture. The effects of solid/liquid ratio, HNO and HSO concentrations, leaching temperature, and reaction time on the leaching efficiency of selenium were investigated. Samples were mineralogically characterized by x-ray diffraction and scanning electron microscopy with energy-dispersive spectroscopy to study the transformation of selenium-containing phases during the leaching process. The results showed that the optimal conditions comprised a solid/liquid ratio of 0.25 g/ml, HNO concentration of 0.5 M, HSO concentration of 2 M, leaching temperature of 363 K, and reaction time of 3 h. A selenium leaching efficiency of 97.79% was obtained under these conditions. Mineralogical characterization indicated that selenium occurred as Cu-Ag selenide in the raw copper anode slimes. This was first converted to elemental selenium and then to selenite ions in solution.
- Subjects
SELENIUM; LEACHING; CHEMICAL engineering; SLIMES (Metallurgy); METAL tailings
- Publication
Metallurgist, 2017, Vol 61, Issue 3/4, p348
- ISSN
0026-0894
- Publication type
Article
- DOI
10.1007/s11015-017-0500-2