G - Physics – 05 – F
Patent
G - Physics
05
F
204/74, 341/1.1
G05F 1/10 (2006.01) C23F 13/00 (2006.01) C25B 15/00 (2006.01) C25C 1/16 (2006.01) C25C 7/06 (2006.01)
Patent
CA 1111125
ABSTRACT OF THE DISCLOSURE A method is disclosed for controlling a process for the recovery or zinc from zinc sulfate electrowinning solutions containing concentrations of impurities. The disclosed method includes the steps or establishing a test circuit comprising a test cell, a sample or electrowinning solution, a cathode, an anode and a reference electrode immersed in said sample, a vari- able voltage source and measuring means electrically connected to the elec- trodes. A potential is applied to the electrodes in the test cell to obtain a predetermined potential between the cathode and the reference electrode. The potential is decreased from the predetermined value at substantially zero current, the decreasing potential is measured, and the decreasing of the potential is terminated at a value corresponding to the point at which zinc starts to deposit on the cathode and the measured electrode current density increases rapidly from a value or substantially zero for further small decreases in potential. The activation over-potential is determined and is related to the concentration of impurities in the sample, whereupon the process for the recovery of zinc is adjusted to obtain optimum zinc re- covery.
306805
Cominco Ltd.
Smart & Biggar
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