某低品位铀矿微生物柱浸试验及其菌群分布规律分析  

Microbial Column Bioleaching Test and Analysis on Bacterial Community Distribution in a Low-grade Uranium Ore

作　　者：马晋芳 李乾 孙静[1,2] 杨雨 蒋熊睿[1,2] 曾海滨 李广悦 史文革 MA Jinfang;LI Qian;SUN Jing;YANG Yu;JIANG Xiongrui;ZENG Haibin;LI Guangyue;SHI Wenge(School of Resource Environment and Safety Engineering,University of South China,Hengyang,Hunan 421001,China;Key Discipline Laboratory for National Defence For Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang,Hunan 421001,China)

机构地区：[1]南华大学资源环境与安全工程学院,湖南衡阳市421001 [2]南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳市421001

出　　处：《矿业研究与开发》2021年第11期138-143,共6页Mining Research and Development

基　　金：国家自然科学基金项目(51804165);湖南省自然科学基金项目(2018JJ3441)。

摘　　要：为了探明混合浸矿细菌菌群对低品位铀矿的浸出特性及菌群分布规律,研究了用混合菌群(A.ferrooxidans、L.ferriphilum、A.thiooxidans)柱浸某低品位花岗岩型铀矿石过程中浸出液参数变化、上下层矿石钝化层的表面特性及微生物群落的分布规律。结果表明,该铀矿石经过20 d酸浸、57 d菌浸之后,铀浸出率达到82.56%左右,其中上层矿石铀浸出率比下层高约1.49%,为83.3%左右,且上层矿渣表面钝化物产生量比下层更少。菌群群落结构分析表明,浸出液中优势菌群为L.ferriphilum、A.thiooxidans、A.ferrooxidans,而上层矿石表面优势菌群为A.thiooxidans、A.ferrooxidans,下层矿石表面优势菌群为A.thiooxidans、L.ferriphilum。研究结果为混合菌群浸铀工艺的实践应用具有一定的指导意义与参考价值。In order to explore the bioleaching characteristics and bacterial community distribution of mixed leaching bacteria for low-grade uranium ore,the liquid parameters,the surface characteristics of the passivation layer in the in the upper and lower column and the bacterial community distribution were investigated in the process of column bioleaching of a low-grade of granite type uranium ore by the mixed bacterial consortium(A.ferrooxidans,L.ferriphilum and A.thiooxidans).The results show that the uranium recovery is about 82.56%in the 20 days acidic leaching and 57 days bacterial leaching.The uranium recovery in the upper column layer is about 83.3%,1.49%higher than that in the lower column layer.Moreover,the yield of the passivation substances in the upper column layer is less than that in the lower column layer.Additionally,the community structure analysis results show that the dominant species in the leaching solution are L.ferriphilum,A.thiooxidans and A.ferrooxidans,while the dominant species on ore surface in the upper column layer are A.thiooxidans,L.ferriphilum,and A.thiooxidans,A.ferrooxidans in the lower column layer.The above results would provide some valuable references for the practical application of uranium bioleaching using mixed bioleaching microorganisms.

关 键 词：低品位铀矿 混合细菌菌群 柱浸 浸出特性 菌群分布规律 

分 类 号：TD925.4[矿业工程—选矿]