C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/209
C25C 3/10 (2006.01) C25C 3/08 (2006.01)
Patent
CA 1151595
A B S T R A C T During its continuous use, the carbon lining of cells for the electrolysis of aluminum oxide frequently exhibits cracks which are formed by stresses due to the thermal dilation of the contents of the cell. The invention enables the formation of such cracks to be avoided by providing, in the floor and corner regions of the tank, grooves (protrusions, doming, bulging) which can be deformed elastically until the forces on the cell walls are equilibrated and therefore yield to the pressure caused by the dilation. Also provided are horizontal, moveable hollow sections, which are secured to the sidewalls of the metal tank and which bend as a result of the temperature gradient in them such that they counter the pressure on the sidewalls due to the dilation of the cell contents. This effect can be intensified by providing holes in the hollow section walls to reduce thermal con- duction within the sections, and therefore maintain the temperature gradient there; the effect can also be reinforc- ed by making the hollow sections out of two materials with different thermal expansion coefficients. - 1 -
362563
Sherman
Swiss Aluminium Ltd.
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