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- Title
EFFECT OF THALLIUM (I) IONS ON THE ZINC ELECTROWINNING PROCESS.
- Authors
Ning YUAN; Xi CHEN; Xing LIU; Lin FU; Yan CUI; Shihong HUANG; Wenjia ZHAO
- Abstract
The effects of thallium(I) ions on the surface morphology, cathode current efficiency, cathode potential, polarization behavior, and electrochemical impedance spectroscopy of zinc electrowinning were studied by scanning electron microscopy and electrochemical measurements. The results showed that with increasing thallium(I) ion concentration in the electrolyte, the hydrogen evolution reaction and the galvanic effect produced during zinc electrowinning increased. When the concentration of thallium(I) ions in the electrolyte was 0.6 mg L-1, the exchange current density of the zinc electrowinning process was maximum and the polarization was minimum. At this time, the Rct of the equivalent circuit was minimum, the CPE value was minimum, and the charge transfer rate was maximum. The cathodic current efficiency decreased from 80% to 55% when the thallium(I) ion concentration was 1.5 mg L-1. The presence of thallium(I) ions also affected the surface macro- and microstructure of the zinc deposits. This result confirmed that thallium(I) ions have a significant negative influence on the electrowinning of zinc.
- Subjects
THALLIUM; ELECTROWINNING; ZINC ions; SCANNING electrochemical microscopy; CATHODE efficiency; HYDROGEN evolution reactions
- Publication
Studia Universitatis Babes-Bolyai, Chemia, 2024, Vol 69, Issue 1, p51
- ISSN
1224-7154
- Publication type
Article
- DOI
10.24193/subbchem.2024.1.04