C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 18/32 (2006.01) B05D 7/22 (2006.01) C23C 18/16 (2006.01)
Patent
CA 2136022
A method and an apparatus for coating tanks and pipe systems internally in that, first, a tank (1) is filled with a liquid (3) consisting of water to which is admixed an acid (10). Oxide coating on the internal surface is removed through heating and circulating the liquid (3) through a filter (4). The liquid (3) is neutralized through the admixture of a base (12). Approximately one fifth of the neutralized liquid (3) is drawn off, the tank (1) being refilled with a concentrated metal solution (15). The temperature, acidity and metal concentration of the liquid (3) are maintained close to constant through supplying heat, acid (10) or base (12), and concentrated metal solution (15), respectively. Air or vapour is supplied through a blowing pipe (5) and creates stirring, surplus liquid and gas being drained through a pipe (16). When the internal surface of the tank (1) has received a coaling having the desired thickness, the process is interrupted in that the liquid (3) is cooled and drained.
Un procédé et un appareil permettent de revêtir la surface interne de réservoirs et de tuyaux. On remplit d'abord un réservoir (1) d'un liquide (3) comprenant de l'eau à laquelle on rajoute un acide (10). L'oxyde se déposant sur la surface interne est éliminé par le chauffage et le passage du liquide (3) au travers d'un filtre (4). On neutralise ce liquide (3) par l'adjonction d'une base (12). On retire environ le cinquième du liquide neutralisé (3) et on refait le plein du réservoir (1) avec une solution métallique concentrée (15). On maintient pratiquement constantes la température, l'acidité et la concentration en métal de ce liquide (3) par apport de chaleur, d'acide (10) ou de base (12) et de solution métallique concentrée (15) respectivement. On amène de l'air ou de la vapeur par un tuyau soufflant (5), ce qui crée une agitation, et le gaz et le liquide excédentaires s'évacuent par un tuyau (16). Lorsque la surface interne du réservoir (1) a reçu un revêtement de l'épaisseur désirée, on interrompt le processus en refroidissant le liquide (3) puis en l'évacuant.
Aanestad Leif I.
Ridout & Maybee Llp
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