Method and means for extracting heat from aluminium...

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 3/12 (2006.01) C25C 3/08 (2006.01)

Patent

CA 2741168

A method and means for extracting more heat out from electrolysis cells for production of aluminium, in order to compensate for the extra heat generated in the cell following amperage increase, as well as reducing the amount of heat dissipated into the raw gas from the cell. An anode assembly in the cell comprises the anode stem (1) which is con-nected to the anode beam (2) and the anode yoke (3) from which the stubs (4) provide further electric contact to the carbon anode (5). The anode stem is for instance cooled by increasing the surface area of the stem above the cell's superstructure (6), or by applying a cooling medium that circulates along the stem. The anode cooling can be combined with the use of a thermal insulation material (7) at the anode stem inside the superstructure.

La présente invention concerne un procédé et un moyen permettant d'extraire une plus grande quantité de chaleur à partir de cellules d'électrolyse destinées à la production d'aluminium afin de compenser la chaleur excédentaire produite dans la cellule suite à une augmentation de l'intensité de courant et permettant également de réduire la quantité de chaleur dissipée dans le gaz brut provenant de la cellule. Un ensemble anode situé dans la cellule comprend la tige anodique (1), qui est assemblée à la poutre anodique (2), et la barrette anodique (3) à partir de laquelle les pieds (4) établissent un contact électrique supplémentaire avec l'anode de carbone (5). La tige d'anode est, par exemple, refroidie en agrandissant la surface de la tige au-dessus de la superstructure de la cellule (6) ou en appliquant un fluide de refroidissement qui circule le long de la tige. Le refroidissement de l'anode peut être combiné à l'utilisation d'un matériau d'isolation thermique (7) au niveau de la tige d'anode à l'intérieur de la superstructure.

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