Biological extraction of metals from a Polish black shale
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Uniwersytet Opolski, Katedra Biologii Stosowanej i Eksperymentalnej
Uniwersytet Opolski, Katedra Inżynierii Procesowej
Jadwiga Farbiszewska-Kiczma   

Uniwersytet Opolski, Wydział Przyrodniczo-Techniczny, Katedra Inżynierii Procesowej, ul. Dmowskiego 7/9, 45-365 Opole, Poland
Publication date: 2003-01-01
Physicochem. Probl. Miner. Process. 2003;37(1):51–56
The black shale ore is characterized by variable content of metals. In black shale metals occur in form of sulphides and sandwich compounds in which metals create organometalic connections with hydrocarbons. The method of flotation is successfully used to enriching sandstone and carbonate ores but this method is not effective for the shale ore. In existing technology of shale ore enriching, this ore is in considerable degree not used and passes to waste material. In this study, the bioextraction process was carried out with a Polish cupriferous black shale ore coming from Lubin-Głogów region on a large laboratory scale. This process was carried out in the „Biomel” batch reactor during 28 days with temperature control (40o C), continuous aeration and mixing (300 r.p.m.). There were used two bacterial cultures A.ferooxidans F7-01 and A.thiooxidans T1- 01. Simultaneously, a control test was performed with thymol as a bacteriostatic substance. A concentration of Cu, Ni, Zn, Pb ions was determined by ASA method every three-four days. The results of investigations confirm our assumptions that Polish black shale ore could be a source of many metals by bioleaching in acid medium. We can suggest that 50% of copper contained in shale is a chalcocite because bioleaching of them was the most effective. The effect of bioleaching sphalerite contained in black shale ore was very low. We have not succeed in bioleaching galena. The following conclusion can be drown: batch strains used in our study convert PbS into PbSO4, which is sparingly soluble and forms precipitate.