C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 3/08 (2006.01) C22B 11/00 (2006.01)
Patent
CA 2593474
The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by a number of mechanisms, including control of the oxidation reaction conditions in the first autoclave compartment, hot curing of the autoclave discharge slurry, and/or contacting of the autoclave feed slurry with the hot cured discharge liquid. Through curing, reactive iron-containing precipitate, such as basic iron sulphate, is allowed to react with acid to form a dissolved iron- containing species, such as ferric sulphate.
L'invention concerne un procédé de récupération de métal précieux, dans lequel des sulfates ferriques basiques et/ou des jarosites sont contrôlés par une pluralité de mécanismes, y compris le contrôle des conditions de réaction d'oxydation dans le premier compartiment de l'autoclave, le traitement à chaud de la bouillie déchargée de l'autoclave, et/ou la mise en contact de la bouillie de chargement de l'autoclave avec le liquide de décharge traité à chaud. Par traitement à chaud, le précipité à teneur en fer réactif, tel que le sulfate de fer basique, est amené à réagir avec l'acide pour former une espèce contenant la fer dissous, sous forme de sulfate ferrique
Ferron Cesare Giosue
Fleming Christopher Andrew
Ji Jinxing
King James A.
Goodwin Mckay
Placer Dome Technical Services Limited
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