Electrowinning anodes which rapidly produce a protective...

Details Electrowinning anodes which rapidly produce a protective... Electrowinning anodes which rapidly produce a protective...

C - Chemistry, Metallurgy

25

C

C25C 7/02 (2006.01)

Patent

CA 2348492

An anode for use in zinc electrowinning is described. The anode is made of a lead-silver alloy which has been cast as a billet, rolled and subjected to heat treatment either during or after rolling. The temperature of treatment is high enough to cause recrystallization of the alloy and to prevent precipitation of any alloying elements. The anode has a surface grain structure which facilitates rapid oxidation of the anode to condition the anode. The anode preferably contains at least 0.03 to 0.45 % silver and up to 0.08 % calcium.

L'invention concerne une anode à utiliser pour l'extraction électrolytique du zinc. L'anode est fabriquée à partir d'un alliage de plomb-argent coulé sous la forme d'une billette, laminé et soumis à un traitement thermique soit pendant, soir après le laminage. La température du traitement, suffisamment élevée, provoque la recristallisation de l'alliage et prévient la précipitation d'un quelconque élément d'alliage. L'anode présente une structure à grains superficielle qui facilite l'oxydation rapide de l'anode de façon à la conditionner. De préférence, l'anode contient au moins 0,03 à 0, 45 % d'argent et jusqu'à 0,08 % de calcium.

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