Method of purifying gold

Details Method of purifying gold Method of purifying gold

C - Chemistry, Metallurgy

22

B

C22B 11/00 (2006.01) C22B 7/00 (2006.01)

Patent

CA 2237171

The present invention is a method of increasing the gold content of metallic gold comprising the step of exposing the metallic gold composition to a leach liquor. The leach liquor is selected to dissolve the impurities from the metallic gold composition without dissolving a significant amount of the gold metal. Preferably, the leach liquor is a solution having a highly acidic dissociation constant, a high oxidative potential and a high tendency to complex cations. The present method preferably includes the steps of roasting the gold in an oxidizing atmosphere or atomization before leaching. The metallic gold composition may be repeatedly roasted and leached until the desired gold purity is obtained.

Procédé permettant d'augmenter la teneur en or de l'or métallique, consistant à mettre la composition d'or métallique en contact avec une liqueur lixiviante. La liqueur lixiviante est adaptée pour dissoudre les impuretés de la composition d'or métallique sans dissoudre en quantité significative l'or. De préférence, la liqueur lixiviante est une solution présentant une constante de dissociation fortement acide, un potentiel d'oxydation élevé et une forte tendance à la complexion des cations. Le procédé décrit consiste de préférence à griller l'or en atmosphère oxydante ou à l'atomiser avec lixiviation. La composition d'or métallique peut être grillée et lixiviée à plusieurs reprises jusqu'à obtention de la pureté d'or voulue.

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