Patent ID: 8021459

Claim:
A method for controlling a continuous cobalt removal in conjunction with a zinc preparation process, in which the cobalt removal is performed in at least two reactors comprising a first reactor and a second reactor connected in series and having a connecting pipe between the two reactors and an outlet pipe from the second reactor, in conjunction with the two reactors, redox potential and acidity and/or basicity are measured, and process variables of the cobalt removal are adjusted toward a desired direction based on the measurement results, wherein the measurement of the redox potential is performed on a sludge produced in the two reactors and is performed in the connecting pipe and in the outlet pipe, and measurement of the acidity and/or basicity are performed on a reactor solution and are determined by means of a BT value, and a measuring instruments of the redox potential are purified at predetermined intervals, and based on the measurement results, introduction of zinc powder into the cobalt removal reactors is adjusted to provide a BT value of about 1.0 to 3.0.