SE359319

• Main Authors: LUECKER J,NL, ARTS M,NL, GROENENBOOM M,NL
• Format: Patent
• Language: English
• Published: 27.08.1973
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS

An apparatus for controlling the electrolytic reduction of aluminum oxide by adjusting the depth of immersion of anode blocks suspended on an anode bridge in an electrolysis melt containing Al2O3, said apparatus being of the type comprising an electric voltage supply for generating a reference voltage which is proportionate with the momentary bath current, an adjusting device for the anode bridge, which adjusting device is controlled by the difference in voltage over the bath and the reference voltage, and a system for deriving, according to a chosen program, a command signal for the adjusting device from the aforementioned differential voltage and the periodic, short excitation of the adjusting device by means of this possible command signal, said apparatus characterized by the improvement that the apparatus comprises an integrator having an input and an output, a set of relays each preceded by a trigger circuit connectable to said output, and means for feeding the differential voltage of the bath voltage and the reference voltage to the integrator and for disconnecting the integrator from the set of relays in the non-excited condition of the adjusting device, and for disconnecting the feeding of said differential voltage to said integrator and connecting said integrator to said set of relays in the excited condition of the adjusting device, and means for feeding back to the input of the integrator the integrated signal from said output when the differential voltage is fed to said integrator.