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Title: Chemoorganotrophic Bioleaching of Olivine for Nickel Recovery
Authors: Chiang, Yi Wai ×
Santos, Rafael
Van Audenaerde, Aldo
Monballiu, Annick
Van Gerven, Tom
Meesschaert, Boudewijn #
Issue Date: Jun-2014
Publisher: MDPI
Series Title: Minerals vol:4 pages:553-564
Abstract: Bioleaching of olivine, a natural nickel-containing magnesium-iron-silicate, was conducted by applying chemoorganotrophic bacteria and fungi. The tested fungus, Aspergillus niger, leached substantially more nickel from olivine than the tested bacterium, Paenibacillus mucilaginosus. A. niger also outperformed two other fungal species: Humicola grisae and Penicillium chrysogenum. Contrary to traditional acid leaching, the microorganisms leached nickel preferentially over magnesium and iron. An average selectivity factor of 2.2 was achieved for nickel compared to iron. The impact of ultrasonic conditioning on bioleaching was also tested, and it was found to substantially increase nickel extraction by A. niger. This is credited to an enhancement in the fungal growth rate, to the promotion of particle degradation, and to the detachment of the stagnant biofilm around the particles. Furthermore, ultrasonic conditioning enhanced the selectivity of A. niger for nickel over iron to a value of 3.5. Pre-carbonating the olivine mineral, to enhance mineral liberation and change metal speciation, was also attempted, but did not result in improvement as a consequence of the mild pH of chemoorganotrophic bioleaching.
URI: 
ISSN: 2075-163X
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Process Engineering for Sustainable Systems Section
Bioengineering Technology TC, Technology Campus Ostend
Technologiecluster Bioengineering Technologie
× corresponding author
# (joint) last author

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