A method and apparatus for applying a treating liquid to a...

C - Chemistry – Metallurgy – 04 – B

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C04B 41/85 (2006.01) B05C 3/09 (2006.01) B05D 1/18 (2006.01) B05D 3/04 (2006.01) C04B 41/45 (2006.01) C04B 41/81 (2006.01) C25C 3/08 (2006.01) C25C 3/12 (2006.01)

Patent

CA 2242387

A method of applying a treating liquid to a porous body (11), in particular a pre-baked carbon component of an aluminium production cell, such as an anode block, a cathode block or a sidewall. In this method, first the body (11) to be treated is inserted, with its part to be treated up, in the treating chamber (12). At least one sealing member (13) is then applied to the inserted body (11) in such a manner as to isolate the chamber into two parts: an upper part (14) of the treating chamber around the part of the body to be treated, isolated from a lower part (15) of the treating chamber around a bottom part of the body which is not to be treated. Next, the upper part (14) of the treating chamber is filled with a treating liquid (10) to cover the part of the body to be treated, and a vacuum is applied to intake an amount of the treating liquid into pores in the part of the body to be treated so that the part of the body to be treated is impregnated with the treating liquid. After completion of the impregnation, the sealing member or members (13) is/are released to free the body, and the treated body (11) is removed from the treating chamber.

Procédé permettant d'appliquer un liquide d'imprégnation sur un corps poreux (11), notamment sur un composant carboné précuit d'une cellule de production d'aluminium, tel qu'un bloc anode, un bloc cathode ou une paroi latérale. Dans ce procédé, on commence par introduire le corps à traiter (11), avec les parties à traiter vers le haut, dans la cuve de traitement (12). On applique au moins un élément d'obturation (13) sur le corps introduit (11), de façon à diviser la chambre en deux parties: une partie supérieure (14) de la chambre de traitement entourant la partie du corps qui est à traiter, isolée d'une partie inférieure (15) de la chambre de traitement entourant la partie inférieure du corps qui n'est pas à traiter. Ensuite, on remplit la partie supérieure (14) de la chambre de traitement avec un liquide d'imprégnation (10) de façon à recouvrir la partie du corps à traiter, et on applique une aspiration de façon à introduire une quantité de liquide d'imprégnation dans les pores de la partie du corps à traiter pour imprégner celle-ci de liquide d'imprégnation. Une fois l'imprégnation terminée, on relâche le ou les éléments (13) de façon à libérer le corps, puis on sort le corps traité (11) de la chambre de traitement.

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