Direct and indirect bioleaching of Co and Ni from iron rich laterite ore using Delftia acidovorans and Acidithiobacillus ferrooxidans

IF 1.1 Q3 MINING & MINERAL PROCESSING
M. H. Nasab, M. Noaparast, H. Abdollahi
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引用次数: 1

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 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.
利用Delftia acidovorans和酸性氧化亚铁硫杆菌直接和间接生物浸出富铁红土矿中的Co和Ni
本研究利用嗜酸异养(Delftia acidovorans)和自养(Acidithiobacillus ferrooxidans)细菌对某富铁红土矿石中Co和Ni的生物浸出进行了研究。嗜酸菌的代谢产物在生物浸出过程中起着重要作用。间接生物浸出结果表明,在温度为90℃、搅拌速度为370 rpm、S/L为0.1的条件下,酸化氧化亚铁硫杆菌和酸化多菌上清液的镍回收率最高,分别为83.65%和80.18%,钴的回收率分别为86.93%和83.94%。在此条件下,两种细菌的铁溶出率分别为64.34%和54.41%。在30℃、150转/分的培养摇床条件下,通过间接生物浸出法提取的镍和钴分别比直接生物浸出法高29.84%和23.75%。对于间接生物浸出,化学控制对富铁红土溶出速率的影响大于扩散控制。化学控制模型中镍和钴的活化能分别为40.07和39.08 kJ/mol。
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来源期刊
Journal of Mining and Environment
Journal of Mining and Environment MINING & MINERAL PROCESSING-
CiteScore
1.90
自引率
25.00%
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0
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