Akzo Nobel N.v.

Permascand Ab

Sven-Erik Bohlin

Anders Ullman

Lars-Erik Bergman

Martin Kroon

Pekka Heiskanen

The present invention relates to a method and a device for sealing a cover plate for an electrolytic cell. Prior-art cell constructions suffer from the problems of, inter alia, a short service life of certain materials and cracking in the materials which results in leakage, which makes it necessary to put the cell out of operation. The problem is solved by the present method of sealing a cover plate for an electrolytic cell, the cell having a base (2), in which risers (1) for the anodes of the cell are attached, the base consisting of at least one basic material with high thermal conductivity, preferably copper, and at least one cover plate (8) which is arranged on the basic material towards the inside of the cell, the riser having a sealing flange (6), to which the cover plate is connected, an additional plate being attached between riser and cover plate to act as a bellows (9; 20), said bellows being attached by welding (10; 11) to the sealing flange (6) of the riser and the cover plate (8), respectively.

Method and device for sealing a cover plate for an electrolytic cell

Electrode used for one pole in underwater transmission of high-voltage direct current, an insulated cable being used for the other pole, such electrodes being adapted to be stationary on the bottom of the sea to serve as the anode and the cathode, respectively, while the sea-water constitutes the electric conductor therebetween. What characterises the invention is that the electrode comprises at least one layer (1) of a flexible, electrically conductive material which preferably is resistant to chlorine-alkali, said layer (1) being enclosed between protective structures (2,3) of a flexible, mechanically resistant material which preferably is resistant to chlorine-alkali, at least one protective structure (2) having openings (4) which are positioned across the surface thereof and through which the sea-water comes into contact with the layer (1).

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Ljungaverk, Sweden

Sven-Erik Bohlin