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Effect of carbon dioxide concentration on the bioleaching of a pyrite–arsenopyrite ore concentrate

The effect of carbon dioxide concentration on the bacterial leaching of a pyrite‐arsenopyrite ore concentrate was studied in continuous‐flow reactors. Steady‐state operation with two feed slurry densities, 6 wt% and 16 wt% solids, were tested for the effect of carbon dioxide concentration. Bacterial growth rates were estimated via the measurement of carbon dioxide consumption rates. Aqueous‐phase carbon dioxide concentrations in excess of 10 mg/L were found to be inhibitory to bacterial growth. © 1993 John Wiley & Sons, Inc.