TITLE

Effects of cobalt, temperature and certain impurities upon cobalt electrowinning from sulfate solutions

AUTHOR(S)
Elsherief, A.E.
PUB. DATE
January 2003
SOURCE
Journal of Applied Electrochemistry;Jan2003, Vol. 33 Issue 1, p43
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The effects of cobalt concentration, temperature and the presence of zinc, copper and iron ions in the electrolyte on current efficiency and cathodic quality were investigated by cyclic voltammetry and galvanostatic methods during cobalt electrowinning. The results showed that high cathodic efficiency of cobalt deposition was obtained from solutions containing cobalt concentration in the range 30-60 g l-1. Current efficiency increased from 94% to 97% with increase in cobalt concentration to 60 g l-1 at 20 °C. it was also found that increase in temperature to 50 °C enhanced the cobalt deposition reaction, along with the rate of hydrogen evolution, resulting in little change in current efficiency. The presence of foreign cations in the electrolyte not only adversely affects current efficiency but also promotes cracking and peeling.
ACCESSION #
15102797

 

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