Processing of acid-consuming mineral materials involving...

C - Chemistry – Metallurgy – 22 – B

Patent

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C22B 15/00 (2006.01) C22B 11/00 (2006.01) C22B 23/00 (2006.01)

Patent

CA 2571557

In one aspect the present invention provides a method of recovering gold from each of at least two different refractory gold-bearing sulfidic mineral materials. A first mineral material is subjected to biooxidation pretreatment to release gold locked within sulfide minerals. The biooxidation produces an acidic biooxidation liquor effluent that contains significant dissolved iron in the ferric form. All or a portion of the biooxidation liquor effluent is used as an acidic treatment liquid to treat the second mineral material, which contains acid-consuming minerals. During the treatment, acid-consuming minerals react with the acidic solution, raising solution pH and resulting in reduced solubility and precipitation of dissolved iron and other metals. Also during the treating, sulfides in the second mineral material or oxidized, thereby releasing gold for subsequent recovery.

L'invention concerne, dans un aspect, un procédé permettant de récupérer de l'or à partir d'au moins deux différents matériaux minéraux sulfurés aurifères réfractaires. Un premier matériau minéral est soumis à un traitement préliminaire par biooxydation, afin de libérer l'or pris dans les minéraux sulfurés. La biooxydation produit un effluent de liqueur de biooxydation acide, qui contient du fer dissous de manière significative, sous forme ferrique. L'ensemble ou une partie de l'effluent de liqueur de biooxydation est utilisé(e) comme liquide de traitement acide, pour traiter le second matériau minéral, qui contient des minéraux avides d'acide. Au cours du traitement, les minéraux avides d'acide réagissent avec la solution acide, ce qui augmente le pH de la solution et a pour effet de réduire la solubilité et le dépôt du fer dissous et d'autres métaux. Au cours du traitement, les sulfures contenus dans le second matériau sont oxydés, ce qui libère l'or pour une récupération subséquente.

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