Apparatus and method for recovery of silver

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 11/00 (2006.01) C22B 3/02 (2006.01) C22B 3/44 (2006.01) G03C 5/395 (2006.01)

Patent

CA 2168342

An improved apparatus and method for recovering metal- lic silver from solutions containing silver ions by reducing sil- ver ions and oxidizing an element in the electromotive series above silver, such as iron. The apparatus provides plug flow of solution into the reaction media and thereby eliminates the principal cause of channelling and premature failure of the me- dia. A distribution chamber distributes solution uniformly to a porous pad of tangled threads or fibers ahead of the media. This ensures a planar flow front of solution as it enters and passes through the media. In a preferred embodiment, the pad is resilient and is supported by a highly open grating. By elim- inating the flow and pressure imbalances or gradients at the entry to the media which are inherent in previous apparatus designs, the invention prevents or greatly retards the onset of channelling or plugging of the media.

L'invention se rapporte à un appareil et à un procédé améliorés de récupération de l'argent métallique compris dans des solutions contenant des ions d'argent. Ce procédé consiste à réduire les ions d'argent et à oxyder un élément qui dans la série électrochimique est supérieur à l'argent, tel que le fer. L'appareil permet un écoulement idéal de la solution dans le milieu réactionnel, et par conséquent, élimine la cause principale de formation de canaux et d'une altération prématurée dudit milieu. Une chambre de distribution répartit uniformément la solution sur un tampon poreux de fils ou fibres enchevêtrés en amont dudit milieu. On obtient ainsi un front d'écoulement plan de la solution lorsqu'elle pénètre et traverse ledit milieu. Selon un mode préféré de réalisation, le tampon est élastique et est supporté par une grille à larges ouvertures. En éliminant les déséquilibres ou gradients de pression et d'écoulement inhérents aux anciens appareils, l'invention prévient ou retarde considérablement la formation de canaux dans ledit milieu ou l'engorgement dudit milieu.

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