Bench-scale test to selectively recover metals from metal mine drainage using biogenic H2S.
Proceedings of the International Land Reclamation and Mine Drainage Conference and Third International Conference on the Abatement of Acidic Drainage, April 24-29, 1994, Pittsburgh, Pennsylvania. Washington, DC: United States Department of the Interior, SP 06D-94, 1994 Apr; 1:214-222
Hydrogen sulfide generated by the anaerobic respiration of sulfate-reducing bacteria was used to treat samples of pH 2.2 water from the abandoned Rio Tinto copper mine in Nevada. The untreated water contained 550 mg/L Fe, 140 mg/L Al, 92 mg/L Cu, 76 mg/L Mn, 60 mg/L Zn, 4 mg/L Co, and 2 mg/L Ni. H2S was generated in a bench-scale bioreactor and bubbled into the mine water in three precipitator-clarifier units, where metal sulfide precipitation and recovery took place. The treatment system reduced the concentrations of all metals except Mn to less than 0.1 mg/L. Manganese concentrations were reduced by 96% to 3.3 mg/L. A CuS-S0 concentrate (33% Cu) and a ZnS-S0 concentrate (28% Zn) were produced that may be suitable for metal recovery at existing smelters.
Proceedings of the International Land Reclamation and Mine Drainage Conference and Third International Conference on the Abatement of Acidic Drainage, April 24-29, 1994, Pittsburgh, Pennsylvania