Abstract: More and more people have been paying attention to the bioleaching technology due to the advantages of low cost, less pollution, shortened process.Because of the low bacterial leaching rate of chalcopyrite at room temperature, it was necessary to research the methods of improving leaching rate of chalcopyrite.Summarized the mechanism of bacterial leaching and the passivation of chalcopyrite.The results showed that jarosite, sulfur layer, intermediate layer, high value of the solution reduction potential and the stability of the chalcopyrite's crystal structure may be the passivation of the bacterial leaching of chalcopyrite.

Key words: Chalcopyrite, Passivation, Bioleaching, Electrochemistry