JPS57164996A - Controlling method for aluminum electrolyzing cell - Google Patents

Abstract

PURPOSE: To control the reduction of inter-electrode distances by measuring any of the cell voltage, cell resistance or cell electric power of an electrolytic cell, then moving an anode upward and downward in conformity with the measured value, and ceasing the downward movement of the anode when the integrated value of the upward and downward movements of the anode lowers below the prescribed lower limit value.

CONSTITUTION: An inter-electrode distance is controlled by moving an anode upward and downward with the electric power, cell voltage or cell resistance to be supplied to an electrolytic cell as an index. More specifically, a standard value is beforehand set as an index, and when the difference between the set value and a measured value exceeds a fixed value, the anode is moved upward or downward by a fixed extent, and the extents of the upward and downward movements of the anode are integrated with the upward movement of the anode as plus and the downward movement as minus. A reference time is set within two hours, more preferably, within 30 minutes from the generation of an anode effect. The rate of the permissible reduction in the inter-electrode distance from the inter-electrode distance at said reference time is beforehand set as a minus value, and when the integrated value lowers below this set value, the downward movement of the anode is ceased, whereby the excessive reduction in the inter-electrode distance is prevented.

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