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Rotating drum bioreactors have shown the potential for bioleaching processes with high solids concentration. A gas-sparger that can produce small bubbles (∼1.0mm) has been fitted into a rotating drum bioreactor to improve gas–liquid mass transfer performance. Gas–liquid mass transfer, solids distribution and power consumption in the rotating drum bioreactor were evaluated as function of bioreactor...
Bioleaching of a marmatite flotation concentrate by Acidithiobacillus ferrooxidans was carried out at 35 °C and an initial pH of 2.0 on an orbital shaker at 160 min −1 . Experimental results indicated that the adapted strains markedly increased the dissolution rate of marmatite when compared with the sterile control and the original strains. The fact that Fe 3+ ions played a key role...
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