Accelerated heat generation in heap bioleaching

Details Accelerated heat generation in heap bioleaching Accelerated heat generation in heap bioleaching

C - Chemistry, Metallurgy

22

B

C22B 3/18 (2006.01) C22B 15/00 (2006.01)

Patent

CA 2664030

A microbial leaching process is carried out on a heap of particulate chalcopyrite ore by adding carbon dioxide to an air stream directed into the heap at least when the heap is at mesophilic temperatures, to stimulate growth, and to achieve a sufficiently high concentration, of mesophilic microbial strains in the heap so as to generate heat, at moderate thermophilic temperatures, at a rate which exceeds the rate of heat loss from the heap.

La présente invention concerne à un procédé de lixiviation bactérienne, qui est réalisé sur un tas de minerai de chalcopyrite particulaire, et qui consiste à ajouter du dioxyde de carbone à un écoulement d'air dirigé dans le tas au moins lorsque ce dernier se trouve à des températures mésophiles, afin de stimuler la croissance, et d'atteindre une concentration suffisamment élevée, de souches microbiennes mésophiles dans le tas, ce qui permet de générer de la chaleur, à des températures thermophiles modérées, à une vitesse supérieure à la vitesse de déperdition thermique du tas.

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