Abstract
The leaching capacity of a new extremely thermophilic microorganism ( Sulfolobus rivotincti) was tested on different metal concentrates. The results using three complex sulphide concentrates demonstrated, in all cases, the culture's capacity to recover high percentages of copper and zinc with slight differences according to the composition of the concentrate used. The bioleaching of chalcopyrite concentrates was studied in the presence of different compounds (chlorides and metallic ions) in an attempt to improve the efficiency of bioleaching. The results confirm the high toxicity of the chloride ion and the negative effect of silver. Of the other ions studied, only bismuth had a positive effect, increasing the rate of copper leaching, although the final percentage of metal in solution was very similar to that obtained with experiments not involving bismuth.
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