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投稿时间:2019-02-11 修订日期:2019-02-18
投稿时间:2019-02-11 修订日期:2019-02-18
中文摘要: 采用不同酸度和不同Fe3+浓度的菌液,对取自新疆伊犁盆地的低品位砂岩铀矿石进行了浸出对比试验,研究矿石的浸出特征及酸度和Fe3+浓度对浸出效果的影响。结果表明,铀的浸出主要发生在前8h,铀浸出最高速度达到16%/h左右,且浸出速度迅速衰减;铀的浸出与酸度正相关, Fe3+浓度高于2.0g/L则对铀的浸出存在明显抑制作用,这可能与发生黄铁钾钒沉淀有关。浸出过程中体系pH和Eh分别上升和下降,变化幅度均与Fe3+浓度呈反相关关系;综合试验成果认为,对研究区矿石而言,微生物浸出酸度5g/L、Fe3+浓度1.5g/L的工艺条件是适宜的。
中文关键词: 砂岩铀矿,微生物溶浸,酸度,Fe3+
Abstract:Batch bioleaching of low-grade sandstone-type uranium ore taken from the Yili basin had been conducted using bacterial solution of different acidity and ferric concentration. Uranium dissolution characteristics and the influences of acidity and Fe3+ concentrations on the uranium dissolution were discussed. It is shown that the uranium dissolution occurs mainly in the first 8 hours of each test. The uranium dissolution rate, of which the maximum is 16%/h, decreases rapidly. Uranium recovery is positively correlated with acidity. However, when the ferric concentration is higher than 2.0g/L the inhibition on uranium dissolution will occur, which may be related to the occurrence of the jarosite precipitation. During the leaching processes, the pH value increases and Eh decreases, and the variations of them are all inversely correlated to ferric concentration. In general, it is believed that acidity of 5g/L and ferric concentration of 1.5g/L are reasonable for leaching of the ore from the interest deposit.
文章编号:20190211001 中图分类号:TL212.1 文献标志码:
基金项目:国家自然科学(41572231),江西省重点研发计划项目(20161BBH80051)
作者 | 单位 | 邮编 |
王晓 | 核资源与环境国家重点实验室 | 330013 |
孙占学 | 核资源与环境国家重点实验室 | 330013 |
周义朋* | 核资源与环境国家重点实验室 | 330013 |
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