??????? ?? ???? ??? ??? ?? ?? ?? (The Change of Isoelectric Points and the Attachment for Chalcopyrite by Indigenous Bacteria)

?? ??? ??????? 42¡æ?? ?????, ??? ???? ??? ??? ??? ????? ?????. ???? ??? ????? ??? ?? 4.20?? ????. ??? ????, ???? ??(»¡ÐÎ) ??? ?????? ??? ??? ???? ????. ?? ????? ??? ?? 0.3¡Á1.6 ???0.3¡Á3.7 ? ??? ????. ???? ??? ??? ???? ???? ??? ? 1.1?? ? 1.6 ? ????. ??????? ???? 50?? ???? ???? ??? XRD??? ??? ??, ?????? (312)??? (116)??? ???? X-????? ?? ??? ?????, ???? (004)??? ???? X-?? ????, ??? (116)??? ???? X-?? ????. ?? ?? XRD?? ??? ??????? ???? ?????? ???? ???? ????. ??? ???? ?? ???-??????, Fe ?? ??? ????? ?? ???????? 1.6? ?? ?? ????, ?? Zn ?? ??? ????? ?? ?????? ???? ????? ?? ????.

This study was to investigate the viability of indigenous acidopuilic bacteria at 42¡æ, including whether there was attachment to chalcopyrite surface with no addition of sulfuric acid. On the results of the zeta potential for the chalcopyrite, the isoelectric point obtained was at a pH value of 4.20. The vibrio-shaped bacteria with flagellum were attached to halcopyrite surface, and the length of these bacteria ranged from 0.3¡Á1.6 ? to 0.3¡Á3.7 ?. The length of a single flagellum with vibrio-shaped bacteria ranged from 1.1 to 1.6 ?. In X-ray diffraction patterns of chalcopyrite in the medium inoculated with indigenous bacteria for 50 days, the intensity of peaks corresponding to planes (312) and (116) were decreased, and a peak at plane (004) appeared, whereas the peak at plane (224) disappeared in the bacteria sample. The results of XRD analysis indicated that the indigenous bacteria were selectively attacking the chalcopyrite on a specific crystal plane. The experiment was in a chalcopyrite-leaching medium with no addition of sulfuric acid, the Fe ion content was higher in the bacteria sample up to 1.6 times more than in the control sample, and the Zn ion content was relatively more than in the control sample.