Inhibition Behaviour of a Mixed Additive upon Zinc Electrowinning from Sulphate Solutions Containing Germanium
A detailed investigation has been carried out to determine the inhibition behavior of a mixed additive gelatin+thiourea+cresol (GTC) on zinc electrowinning from sulphate solutions containing germanium. The results indicate that zinc redissolution is inhibited because of germanium in existence, current efficiency is increased and surface morphology of cathode zinc is improved using proper GTC in the electrolyte. Cathode polarization curves were traced and analyzed to indicate that additive GTC may inhibit the depolarization and stimulating hydrogen evolution effects of germanium on zinc deposition.
Yungang Li, Pengcheng Wang, Liqun Ai, Xiaoming Sang and Jinglong Bu
C. X. Liu et al., "Inhibition Behaviour of a Mixed Additive upon Zinc Electrowinning from Sulphate Solutions Containing Germanium", Advanced Materials Research, Vols. 291-294, pp. 1479-1483, 2011