title: A novel biphasic leaching approach for the recovery of Cu and Zn from polymetallic bulk concentrate.
abstract: 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.
authors.affiliation: Institute of Forensic Science, Gujarat Forensic Sciences University, Gandhinagar 382007, Gujarat, India; Department of Microbiology and Biotechnology, School of Sciences, Gujarat University, Ahmedabad 380009, Gujarat, India.
authors.forename: Bhargav C
authors.initials: BC
authors.lastname: Patel
authors.affiliation: CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India.
authors.forename: Manish Kumar
authors.initials: MK
authors.lastname: Sinha
authors.affiliation: Department of Microbiology and Biotechnology, School of Sciences, Gujarat University, Ahmedabad 380009, Gujarat, India.
authors.forename: Devayani R
authors.initials: DR
authors.lastname: Tipre
authors.affiliation: CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India.
authors.forename: Abhilash
authors.initials: A
authors.lastname: Pillai
authors.affiliation: Department of Microbiology and Biotechnology, School of Sciences, Gujarat University, Ahmedabad 380009, Gujarat, India. Electronic address: shaileshrdave@yahoo.co.in.
authors.forename: Shailesh R
authors.initials: SR
authors.lastname: Dave
mesh_terms: D001673:Biodegradation, Environmental; D018441:Biofilms; D019149:Bioreactors; D003300:Copper / Q000302:isolation & purification*; D007501:Iron / Q000378:metabolism; D010084:Oxidation-Reduction; D012997:Solvents; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D015032:Zinc / Q000302:isolation & purification*
chemical_list: D012997:Solvents; D014874:Water Pollutants, Chemical; D003300:Copper; D007501:Iron; D015032:Zinc
keywords: Bioleaching; Leptospirillum ferriphilum; Solvent extraction; Two stage leaching