METHOD OF CORRECTION OF A MAGNETIC FIELD OF HEROULT-HALL ELECTROLYZER AND A DEVICE FOR ITS REALIZATION Russian patent published in 2005 - IPC

FIELD: nonferrous metallurgy.

SUBSTANCE: the invention is dealt with nonferrous metallurgy, in particular, with devices and methods of correction of the magnetic fields at production of aluminum by an electrolysis from fused salts in an electrolyzer of a square form. The method provides for a passing of a correcting current through a bus-duct electrically not linked with the electrolyzer to independent sections of the bus-duct, which magnetic field interacts with an operating current of a vertical direction in the molten aluminum with origination of longitudinal force of compensation of the longitudinal skews of a boundary of an electrolyte - the molten aluminum, bus ducts caused by external magnetic fields of bus-ducts and adjacent electrolyzers. At the initial stage after start-up of the electrolyzer or an anodic effect quenching, a permanent electric current is fed onto all independent sections of the bus-duct; and in periods between anodic effects an alternating current is fed onto the middle independent section of the bus-duct, and in a mode of an approaching anodic effect they fed a pulsed alternating in-phase current with a frequency equal to the resonance frequency of standing waves at the border of an electrolyte - molten aluminum on all is fed onto all independent sections of the bus-duct. The device contains a bus-duct for gating through of the correcting current. The bus-duct is made in the form of a closed circuit formed by pipes made out of a nonmagnetic weak-conductive material and separated by bonding strips being in parallel to the short side of the bath for at least three independent sections and laid along the internal perimeter of the ferromagnetic body of the bath under a laying of refractory bricks. Inside the sections there are control windings with a possibility to be connected to independent power supplies a permanent, variable or pulsed alternating current. The invention allows to eliminate a longitudinal skew of the surface of the molten aluminum, caused by external magnetic fields of bus-ducts and adjacent electrolyzers, to quench the dangerous oscillations and to intensify process in the interpole space.

EFFECT: the invention allows to compensated a longitudinal skew of the molten aluminum surface, to quench the dangerous oscillations, to intensify process in the interpole space.

2 cl, 2 dwg