A novel biphasic leaching approach for the recovery of Cu and Zn from polymetallic bulk concentrate

In scale-up biphasic leaching process of polymetallic concentrate, the ferric bioregeneration cycles were performed in 15.0L down flow packed bed reactor; whereas the chemical leaching cycles were done using the biogenerated ferric in an indigenously designed 10.0L stirred tank reactor. The consorti...

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Bibliographic Details
Published in:Bioresource technology 2014-04, Vol.157, p.310-315
Main Authors: PATEL, Bhargav C, MANISH KUMAR SINHA, TIPRE, Devayani R, PILLAI, Abhilash, DAVE, Shailesh R
Format: Article
Language:English
Subjects:
Biodegradation, Environmental
Biofilms
Biological and medical sciences
Bioreactors
Biotechnology
Copper
Copper - isolation & purification
Fundamental and applied biological sciences. Psychology
Iron
Iron - metabolism
Isotherms
Leaching
Oxidation-Reduction
Phase ratio
Reactors
Solvents
Tanks
Water Pollutants, Chemical - isolation & purification
Zinc
Zinc - isolation & purification
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Summary:In scale-up biphasic leaching process of polymetallic concentrate, the ferric bioregeneration cycles were performed in 15.0L down flow packed bed reactor; whereas the chemical leaching cycles were done using the biogenerated ferric in an indigenously designed 10.0L stirred tank reactor. The consortium took 25cycles for proper biofilm formation. It showed highest iron oxidation rate (IOR) of 3908.21mg/L/h at 25thcycle under no polymetallic stress. Even under stressed conditions, it was 2650-558mg/L/h. Cu extractions were 86.63-46.51 and Zn extractions were 67.89-14.74% in 1st-4thcycle, respectively. The developed consortium exhibited 17-51times higher IOR compared to original wild type consortium. Extraction isotherm for zinc with 30% Cyanex® 301 indicated that a total of two stages are required for its complete extraction using the phase ratio of 2:1 at equilibrium pH 1.5, leaving behind Fe(II) in the raffinate.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2014.01.101