Aluminum Pechiney

Aluminium Pechiney

Paul Morel

Jean-Pierre Dugois

Bernard Langon

The invention concerns a process for reducing magnetic disturbances in series of electrolysis tanks operating at high current strength. The process comprises passing the negative connecting conductors between the tanks and fixing the distribution of current between the downstream end and the upstream end or the central riser input members of each tank, so as to nullify the component By of the magnetic field at the center of the tank and to render anti-symmetric the component By of the magnetic field at the middle of the long side of the tank, relative to the axis Oy. The field of the adjacent row is also compensated by means of a compensation conductor through which passes a current which circulates in the opposite direction to the electrolysis current. Use for the production of aluminium in series of electrolysis tanks which are supplied with current strengths which may reach 200,000 amperes.

Process for reducing the magnetic disturbances in series of

The invention relates to a device for reducing magnetic disturbances in a series of very high intensity electrolysis cells. The device is characterized by the supply of an anode bus bar both through its two ends and through at least one central riser supplied from upstream cathode outputs and by a branch on the downstream cathode output rods of the preceding cell. Application is to the production of aluminum by electrolysis of alumina in molten cryolite.

Device for reducing magnetic disturbances in series of very high

A means of compensating the magnetic field induced by the adjacent line in series of high intensity electrolysis cells placed in a transverse direction. A compensating conductor traversed by a direct current which induces an antagonistic field neutralizing the parasitic field of the adjacent line is arranged along each line on the internal side and/or on the external side. Excellent compensation is achieved by regulating the intensity in each conductor and the distance between the conductor and the line. Application may be to series of igneous, very high intensity electrolysis cells for the production of aluminum.

Means of compensating the magnetic field induced by the adjacent line in

The invention relates to a method of improving the current supply of electrolysis cells such as used in the production of aluminum by igneous electrolysis of alumina dissolved in cryolite, in which the cells are aligned in a lengthwise direction, allowing the harmful influence of the induced magnetic fields to be reduced. In a series, each cell is supplied with current from the preceding cell both via the head and via at least one side riser. The output of the cathode bars are divided into two separate groups, the upstream group supplying the head of the subsequent cell and the downstream group supplying the side risers of the subsequent cell. This produces a substantial improvement in the efficiency and a greater regularity.

Method of improving the current supply of electrolysis cells aligned in

A method of compensating the magnetic fields of adjacent rows of transversely arranged igneous electrolysis cells, in which the distribution of the current in the conductors feeding the anode of a downstream cell from the cathode of the adjacent upstream cell is modified so as to superimpose upon the cell an electrical loop which produces an additional magnetic field substantially equal to that created by the adjacent row and opposite to it in direction, wherein the electrical loop develops its compensating effect solely on the outer head of the electrolysis cell.

Method of and an apparatus for compensating the magnetic fields of

The invention relates to a method of and an apparatus for compensating the magnetic fields in adjacent rows of transversely arranged igneous electrolysis cells. In this method, the distribution of current in the conductors feeding the anode of a downstream cell from the cathode of the adjacent upstream cell is modified in such a way as to superimpose upon the cell an electrical loop which produces an additional magnetic field substantially equal to that created by the adjacent row and opposite in direction. The invention is applicable to the compensation of the magnetic fields of adjacent rows of transversely arranged igneous electrolysis cells and, more particularly, to cells for the production of aluminium.

Method and apparatus for compensating the magnetic fields in adjacent

The invention relates to a method and a device for supplying electric current to igneous electrolysis tanks. According to the method, each element, front and rear, of the upstream collector is divided into two parts, one end part 19-20 and the other the central part 17-18, and the tank is supplied by four risers, including two end risers 23-24 and two central risers 25-27 and 26-28; each central riser comprises two elements 25 and 27 located in the same plane parallel to the plane of symmetry (XX) and situated respectively at 1/4 and 3/4 of the length of the cathode, one 25 of these elements passing under the upstream tank 13. The invention applies to igneous electrolysis tanks and more particularly to those intended for the manufacture of aluminium.

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Le Vesinet, France

Paul Morel