Method and apparatus for controlling the quality of zinc...

Details Method and apparatus for controlling the quality of zinc... Method and apparatus for controlling the quality of zinc...

C - Chemistry, Metallurgy

25

C

204/74, 341/1.1

C25C 1/16 (2006.01) G01N 27/416 (2006.01)

Patent

CA 1174200

ABSTRACT OF THE DISCLOSURE A method and apparatus for controlling a process for the recovery of zinc from zinc sulfate electrolyte containing concentrations of impurities and addition agents. The method and apparatus include a test circuit comprising a test cell, a sample of electrolyte, a moving cathode, an anode and a reference electrode immersed in said sample, a constant current source and measuring means electrically connected to the electrodes. A controlled low current is applied to the electrodes in the test cell to measure the activation overpotential between the cathode and the reference electrode. The activation overpotential is measured at the point of inchoate deposition of zinc and is related to the concentration of impurities and addition agents in the sample. The processes for the purification of zinc sulfate electrolyte and the recovery of zinc from zinc sulfate electrolyte are subsequently adjusted in relation to the measured value of the activation overpotential to obtain optimum zinc recovery.

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