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Journal of Mining and Environment، جلد ۱۲، شماره ۲، صفحات ۴۷۱-۴۸۹
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عنوان انگلیسی Direct and Indirect Bio-Leaching of Co and Ni from an Iron-Rich Laterite Ore using Delftia Acidovorans and Acidithiobacillus Ferrooxidans
چکیده انگلیسی مقاله 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 83.65% and 80.18%, respectively, by the supernatants of Acidithiobacillus ferrooxidans and Delftia acidovorans, both measured at 90 °C for 3 h with a stirring speed of 370 rpm and S/L of 0.1, while the corresponding cobalt recovery rates have reached 86.93% and 83.94%, respectively. The iron dissolution rates in these conditions for the two studied bacteria are 64.34% and 54.41%, respectively. The nickel and cobalt extractions by the indirect bio-leaching of Delftia acidovorans are, respectively, 29.84% and 23.75% higher than those for the direct bio-leaching, performed at 30 °C and 150 rpm of an incubator shaker for 30 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 40.07 and 39.08 kJ/mol, respectively.
کلیدواژه‌های انگلیسی مقاله laterite, acidophilic bacteria, supernatant, Kinetics, chemical control
نویسندگان مقاله 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

نشانی اینترنتی http://jme.shahroodut.ac.ir/article_2037_c14198951021bf578b0c35de5209fc9e.pdf
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