| 杨雨,李乾,马晋芳,孙静,李广悦,刘晓蓓.某铀矿细菌菌群柱浸过程中的硫强化作用及其机理分析[J].南华大学学报(自然科学版),2022,(4):17~25.[YANG Yu,LI Qian,MA Jinfang,SUN Jing,LI Guangyue,LIU Xiaobei.Sulfur Enhancement and Mechanism Analysis During Column Bioleaching of a Uranium Ore by Mixed Bacteria Community Leaching[J].Journal of University of South China(Science and Technology),2022,(4):17~25.] |
| 某铀矿细菌菌群柱浸过程中的硫强化作用及其机理分析 |
| Sulfur Enhancement and Mechanism Analysis During Column Bioleaching of a Uranium Ore by Mixed Bacteria Community Leaching |
| 投稿时间：2022-03-27 |
| DOI： |
| 中文关键词: 铀生物浸出 硫强化 细菌群落 铀溶解动力学 |
| 英文关键词:uranium bioleaching sulfur enhancement bacterial community structure uranium dissolution kinetic |
| 基金项目:国家自然科学基金项目(51804165);湖南省自然科学基金项目(2018JJ3441) |
| 作者 | 单位 | | 杨雨 | 南华大学 资源环境与安全工程学院,湖南 衡阳 421001
南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001 | | 李乾 | 南华大学 资源环境与安全工程学院,湖南 衡阳 421001
南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001 | | 马晋芳 | 南华大学 资源环境与安全工程学院,湖南 衡阳 421001
南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001 | | 孙静 | 南华大学 资源环境与安全工程学院,湖南 衡阳 421001
南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001 | | 李广悦 | 南华大学 资源环境与安全工程学院,湖南 衡阳 421001
南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001 | | 刘晓蓓 | 南华大学 资源环境与安全工程学院,湖南 衡阳 421001
南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001 |
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| 中文摘要: |
| 评估了由Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans和Leptospirillum ferriphilum组成的混合菌群在柱式反应器中浸出某复杂铀矿的硫强化作用及其可行性。在77 d细菌柱浸过程中,硫强化(8 g/kg)后,铀的浸出率达到了约83.61%,与对照组相比,增加了10%。利用扫描电镜和X射线荧光光谱仪对矿渣进行了表征,结果表明硫强化后的矿渣表面有细菌侵蚀的痕迹且孔隙度增大。细菌群落分析表明,硫强化后浸出液中的优势种群从Leptospirillum ferriphilum转变为Acidithiobacillus ferrooxidans,且Leptospirillum ferriphilum在下层矿石表面占比从强化前的4.3%增加到了40.74%,和Acidithiobacillus thiooxidans保持了较好的平衡。此外,动力学分析表明,铀矿细菌柱浸动力学模型更遵循了通过中间产物层控制的内部扩散模式,且硫强化能够增强铀的浸出动力学。最后,建立了一个与细菌群落和化学反应相关联的硫强化生物浸铀的机制模型。 |
| 英文摘要: |
| The feasibility of sulfur enhancement for uranium bioleaching in column reactors from a refractory uranium ore by Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans and Leptospirillum ferriphilum consortium was assessed. The leaching rate of uranium after sulfur enrichment (8 g/kg) reached about 86.31% during 77 days of column leaching, increased by 10% versus the control without sulfur. The characteristics of mineral residue were detected by SEM and XRF. The results indicated that there were traces of bacterial erosion on the surface of the sulfur-enhanced slag surface and significantly increased porosity. Bacterial community analysis showed that the dominant community in the leachate after sulfur enhancement was transferred from Leptospirillum ferriphilum to Acidithiobacillus ferrooxidans, and the percentage of Leptospirillum ferriphilum on the lower ore surface increased from 4.3% before enhancement to 40.74%, maintaining a better balance with Acidithiobacillus thiooxidans. Additionally, the kinetic analysis showed that the sulfur-enhanced uranium bioleaching process in the column reactor followed more of an internal diffusion pattern controlled through the product layer, and sulfur enhancement could enhance the leaching kinetics and accelerate the leaching of uranium. Lastly, a mechanistic model of sulfur-enhanced uranium bioleaching with the bacterial community and chemical reactions was established. |
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