Role of Fe/S ratios in the enhancement of uranium bioleaching from a complex uranium ore by Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans consortium

Sun, Jing; Ma, Jinfang; Li, Qian; Li, Guangyue; Shi, Wujie; Yang, Yu; Hu, Pengfei; Guo, Zhouyi

doi:10.1007/s11771-022-5216-1

Cited by 3 publications

(1 citation statement)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, it was found that an appropriate Fe/S ratio in the ores is critical for the growth and activities of the bioleaching microorganisms, which would be the prerequisite for the synergistic effects of the bacterial consortia (Xia et al, 2009 ). The process of community succession and metabolism of a microbial consortium composed of Acidithiobacillus thiooxidans ( A. thiooxidans ), Acidithiobacillus ferrooxidans ( A. ferrooxidans ) and Leptospirillum ferriphilum ( L. ferriphilum ) were closely related to the leaching behavior of minerals, and could be regulated by mineral composition and element ratio like iron/sulfur ratio (Yang et al, 2021 ; Sun et al, 2022 ; Wu et al, 2022 ). The variation in energy metabolism structure of the microbial community during chalcopyrite bioleaching with different iron/sulfur ratios was proved different (Yang et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore

Yang

et al. 2023

Front. Microbiol.

Self Cite

View full text Add to dashboard Cite

The feasibility of sulfur enhancement for uranium bioleaching in column reactors was assessed with a designed mixed Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferriphilum from a refractory uranium ore. The uranium extraction reached 86.2% with the sulfur enhancement (1 g/kg) in 77 days leaching process, increased by 12.6% vs. the control without sulfur addition. The kinetic analysis showed that uranium bioleaching with sulfur enhancement in columns followed an internal diffusion through the product layer-controlled model. Ore residue characteristics indicated that sulfur enhancement could strengthen the porosity of passivation layer, improving the ore permeability. Notably, bacterial community analysis showed that sulfur enhancement at 1 g/kg could make the iron-oxidizing and sulfur-oxidizing bacteria on the ore surface maintain a good balance (approx. 1:1), and thus decomposing ore more effectively. Lastly, a possible mechanism model for uranium bioleaching with sulfur enhancement was proposed.

show abstract