title: Synergistic effect of biogenic Fe3+coupled to S° oxidation on simultaneous bioleaching of Cu, Co, Zn and As from hazardous Pyrite Ash Waste.
abstract: Pyrite ash, a waste by-product formed during roasting of pyrite ores, is a good source of valuable metals. The waste is associated with several environmental issues due to its dumping in sea and/or land filling. Although several other management practices are available for its utilization, the waste still awaits and calls for an eco-friendly biotechnological application for metal recovery. In the present study, chemolithotrophic meso-acidophilic iron and sulphur oxidisers were evaluated for the first time towards simultaneous mutli-metal recovery from pyrite ash. XRD and XRF analysis indicated higher amount of Hematite (Fe2O3) in the sample. ICP-OES analysis indicated concentrations of Cu>Zn>Co>As that were considered for bioleaching. Optimization studies indicated Cu - 95%, Co - 97%, Zn - 78% and As - 60% recovery within 8days at 10% pulp density, pH - 1.75, 10% (v/v) inoculum and 9g/L Fe2+. The productivity of the bioleaching system was found to be Cu - 1696ppm/d (12% dissolution/d), Co - 338ppm/d (12.2% dissolution/d), Zn k 576ppm/d (9.8% dissolution/d) and As - 75ppm/d (7.5% dissolution/d). Synergistic actions for Fe2+- S° oxidation by iron and sulphur oxidisers were identified as the key drivers for enhanced metal dissolution from pyrite ash sample.
authors.affiliation: Mineral-Metal Recovery and Recycling (MMR&R) Research Group, Mineral Processing Division, Department of Mining Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey.
authors.forename: Sandeep
authors.initials: S
authors.lastname: Panda
authors.affiliation: Mineral-Metal Recovery and Recycling (MMR&R) Research Group, Mineral Processing Division, Department of Mining Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey. Electronic address: ataakcil@sdu.edu.tr.
authors.forename: Ata
authors.initials: A
authors.lastname: Akcil
authors.affiliation: Mineral-Metal Recovery and Recycling (MMR&R) Research Group, Mineral Processing Division, Department of Mining Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey; Academy of Scientific and Innovation, Research, CSIR - Institute of Minerals & Materials Technology (AcSIR), Bhubaneswar 751013, India.
authors.forename: Srabani
authors.initials: S
authors.lastname: Mishra
authors.affiliation: Mineral-Metal Recovery and Recycling (MMR&R) Research Group, Mineral Processing Division, Department of Mining Engineering, Suleyman Demirel University, TR32260 Isparta, Turkey.
authors.forename: Ceren
authors.initials: C
authors.lastname: Erust
mesh_terms: D001151:Arsenic / Q000737:chemistry; D001673:Biodegradation, Environmental; D019149:Bioreactors; D060729:Coal Ash / Q000032:analysis; D003035:Cobalt / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D004777:Environment; D004785:Environmental Pollutants / Q000032:analysis*; D005290:Ferric Compounds / Q000737:chemistry*; D006256:Hazardous Waste / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis; D007501:Iron / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D013440:Sulfides / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry; D014866:Waste Products / Q000032:analysis; D014961:X-Ray Diffraction; D015032:Zinc / Q000737:chemistry
chemical_list: D060729:Coal Ash; D004785:Environmental Pollutants; D005290:Ferric Compounds; D006256:Hazardous Waste; D007220:Industrial Waste; D013440:Sulfides; D013464:Sulfuric Acids; D014866:Waste Products; C011342:pyrite; C000499:ferric oxide; D003035:Cobalt; D013455:Sulfur; D003300:Copper; D007501:Iron; D015032:Zinc; D001151:Arsenic; C033158:sulfuric acid; D010100:Oxygen
keywords: Acidophiles; Bioleaching; Multi-metal recovery; Pyrite ash; Waste