Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1991-05-06
1992-12-01
Valentine, Donald R.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
C25C 308
Patent
active
051677873
ABSTRACT:
The amount of electrically conductive material in the bottom floor lining of a conventional aluminum reduction cell is reduced by using a non-conductive lining material in its place. The non-conductive material separates the remaining electrically conductive regions from the sidewall linings of the cell and preferably confines the electrically conductive material to the "anode shadow" region of the cell floor. In another embodiment joints between the conductive and non-conductive regions are positioned such that they are covered by cell freeze (solid electrolyte) during operation of the cell. This prevents liquid cell contents penetrating the joint and adversely affecting the cell lining, thus shortening the life of the cell. The non-conductive material preferably comprises a particulate alumina mixture made up of large shapes which firmly compact together and smaller particles which fill the remaining voids. Optionally, the mixture may be bonded together with amorphous alumina, in which case the mixture can also be used for cell wall linings. The linings can be used in reduction cells of conventional design and reduces undesirable magnetohydrodynamic effects as well as pollution hazards caused by conventional carbonaceous cell linings.
REFERENCES:
patent: 3960696 (1976-06-01), Wittner
patent: 4087345 (1978-05-01), Sandvik et al.
patent: 4194959 (1980-03-01), Hudson et al.
patent: 4392925 (1983-07-01), Alder et al.
patent: 4495047 (1985-01-01), Gesing et al.
Allaire Claude
Gnyra Bohdan
Hudson Tom J.
McIntyre John
Tremblay Pierre
Alcan International Limited
Valentine Donald R.
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