Stability of [BMIM]HSO4 for using as additive during zinc electrowinning from acidic sulfate solution

The stability of ionic liquid additive 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM]HSO 4 ) during zinc electrowinning from acidic sulfate solution was investigated by cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy. Compared with the traditional in...

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Bibliographic Details
Published inJournal of Central South University Vol. 19; no. 9; pp. 2451 - 2457
Main Authors Zhang, Qi-bo, Hua, Yi-xin
Format Journal Article
LanguageEnglish
Published Heidelberg Central South University 01.09.2012
Subjects
Engineering
Metallic Materials
zinc electrowinning
electrochemical measurement
morphology
ionic liquid additive
stability
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Summary:The stability of ionic liquid additive 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM]HSO 4 ) during zinc electrowinning from acidic sulfate solution was investigated by cyclic voltammetry, electrochemical impedance spectroscopy and scanning electron microscopy. Compared with the traditional industrial additives, gelatine and gum arabic, [BMIM]HSO 4 has more excellent chemical and thermal stabilities. The inhibition effects of gelatine and gum arabic on the zinc electrocrystallization are observed to markedly weaken due to their part degradation after 12 h longtime successive electrolysis and high temperature (90 °C) treatments. In contrast, the activity of [BMIM]HSO 4 is practically unaffected after 24 h longtime successive electrolysis and high temperature treatments. These results are corroborated with the corresponding morphological analysis of the cathodic deposits.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-012-1296-7