来自难处理铀矿石的柱式反应器中硫对铀生物浸出的强化作用。
Sulfur enhancement effects for uranium bioleaching in column reactors from a refractory uranium ore.
作者信息
Li Qian, Yang Yu, Ma Jinfang, Sun Jing, Li Guangyue, Zhang Ruiyong, Cui Zhao, Li Ting, Liu Xiaobei
机构信息
School of Resources and Environment and Safety Engineering, University of South China, Hengyang, China.
Key Discipline Laboratory for National Defence of Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China.
出版信息
Front Microbiol. 2023 Jan 26;14:1107649. doi: 10.3389/fmicb.2023.1107649. eCollection 2023.
The feasibility of sulfur enhancement for uranium bioleaching in column reactors was assessed with a designed mixed and 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.
通过设计的混合体系并采用难处理铀矿石，评估了在柱式反应器中硫强化铀生物浸出的可行性。在77天的浸出过程中，添加硫强化剂（1 g/kg）时铀提取率达到86.2%，相较于不添加硫的对照试验提高了12.6%。动力学分析表明，柱式反应器中硫强化铀生物浸出遵循通过产物层控制的内扩散模型。矿石残渣特性表明，硫强化可增强钝化层的孔隙率，提高矿石渗透性。值得注意的是，细菌群落分析表明，1 g/kg的硫强化可使矿石表面的铁氧化菌和硫氧化菌保持良好平衡（约1:1），从而更有效地分解矿石。最后，提出了硫强化铀生物浸出的可能机理模型。
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