Biooxidation of arsenic refractory ores in the presence of polymer film

摘要

The bacterial oxidation of arsenic bearing tailings from Zloty Stok (Poland) closed arsenic mine was investigated. Experiments were conducted using a culture of T. ferrooxidans originates from mine water samples. Isolated strains were adapted to the high arsenic concentration. The maximum surface area after the biooxidation process was obtained at the pulp density of 12%(w/w). The adsorption isotherms of Dextrin were determined for three-size fraction of tailings. The leaching of As and Fe (Ⅲ) was a lineal correlation with the Dextrin adsorption. Study of the biooxidation with various mediums showed that the medium without ferrous iron was the best. Furthermore, the surface area of mineral samples should be available parameter for the kinetic investigation of arsenic bearing minerals biooxidation when the ferric arsenate and sulfur were precipitated.