Mohsen Valizadeh Holagh, Davood Moradkhani, Behzad Sedaghat
In this paper the production of cobalt cathode, using hydrometallurgical process from zinc plant
residue in pilot scale is discussed. The pilot was set up for a period of 2 months. Pilot test results
have been reported during 15 days. The cobalt filter cake produced in the zinc production plants in
Iran contains 0.32 % cobalt, 2.65 % manganese and 20.44 % zinc. The cobalt cathode production
process consists of 6 stages:
1) Zinc Washing,
2) Reductive-acidic leaching,
3) Zinc solvent extraction,
4) Precipitation of Co as carbonate,
5) Acidic dissolution of CoCO3,
6) Co electrowinning.
The average purity of produced cobalt cathode was 99.984 %. Applying the mentioned method,
average recovery of the cobalt cathode production was achieved 73.23 %. The mass balance of
flows was achieved during pilot tests. The cobalt plant basic engineering design was done according
to pilot mass balance.