中文摘要
The bioleaching of copper sulphide minerals was investigated by using
A. ferrooxidans ATF6. The result shows the preferential order of the minerals bioleaching as djurleite>bornite>pyritic chalcopyrite>covellite>porphyry chalcopyrite. The residues were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It is indicated that jarosite may not be responsible for hindered dissolution. The elemental sulfur layer on the surface of pyritic chalcopyrite residues is cracked. The compact surface layer of porphyry chalcopyrite may strongly hinder copper extraction. X-ray photoelectron spectroscopy (XPS) further confirms that the passivation layers of covellite, pyritic chalcopyrite, and porphyry chalcopyrite are copper-depleted sulphide Cu
4S
11, S8, and copper-rich iron-deficient polysulphide Cu
4Fe
2S
9, respectively. The ability of these passivation layers was found as Cu
4Fe
2S
9>Cu
4S
11>S
8>jarosite.