Direct and Indirect Bio-Leaching of Co and Ni from an Iron-Rich Laterite Ore using Delftia Acidovorans and Acidithiobacillus Ferrooxidans
Publish place: Journal of Mining and Environment، Vol: 12، Issue: 2
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JMAE-12-2_013
تاریخ نمایه سازی: 20 تیر 1400
Abstract:
In this research work, the bio-leaching of Co and Ni from an iron-rich laterite ore is assessed using the acidophilic heterotrophic (Delftia acidovorans)and autotrophic (Acidithiobacillus ferrooxidans) bacteria. The metabolic products of the acidophilic bacteria play an important role in bio-leaching. The results obtained from the indirect bio-leaching indicate the highest nickel recoveries of up to ۸۳.۶۵% and ۸۰.۱۸%, respectively, by the supernatants of Acidithiobacillus ferrooxidans and Delftia acidovorans, both measured at ۹۰ °C for ۳ h with a stirring speed of ۳۷۰ rpm and S/L of ۰.۱, while the corresponding cobalt recovery rates have reached ۸۶.۹۳% and ۸۳.۹۴%, respectively. The iron dissolution rates in these conditions for the two studied bacteria are ۶۴.۳۴% and ۵۴.۴۱%, respectively. The nickel and cobalt extractions by the indirect bio-leaching of Delftia acidovorans are, respectively, ۲۹.۸۴% and ۲۳.۷۵% higher than those for the direct bio-leaching, performed at ۳۰ °C and ۱۵۰ rpm of an incubator shaker for ۳۰ days. For the indirect bio-leaching, the chemical control has a larger influence on the dissolution rate of the iron-rich laterite compared to the diffusion control. The activation energies of nickel and cobalt in the chemical control model are ۴۰.۰۷ and ۳۹.۰۸ kJ/mol, respectively.
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Authors
M. Hosseini Nasab
Mining Department, University of Sistan and Baluchestan, Zahedan, Iran
M. Noaparast
School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
H. Abdollahi
School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran