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有色金属(冶炼部分):2021,(10):96-101
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模拟降雨条件下不同磷酸盐对土壤吸附铀的影响
张子晴1, 陈井影1, 范镇荻2
(1.东华理工大学;2.东华理工大学核资源与环境国家重点实验室)
Effect of Different Phosphate on Uranium Adsorption in Simulated Rainfall
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投稿时间:2021-05-31    修订日期:2021-06-01
中文摘要: 以铀矿山尾矿库周边的土壤为研究对象,通过不同磷酸盐作用下的淋滤试验,研究土壤吸附放射性核素铀的机理,以及铀在土壤中迁移、转化的规律和赋存形态的影响。结果表明,随着淋滤时间的增加,因磷酸二氢根与羟基在土壤中发生交换解吸反应,体系中富含OH-,渗滤液pH均不断升高;土壤中添加磷酸盐后,渗沥液中铀浓度低于矿山废水排放标准,淋滤后土壤中铀含量随深度增加而降低,土壤中残渣态铀含量增加明显,表明磷酸盐可以在一定程度上固定土壤中的铀,其中磷酸二氢钾的效果最佳。FTIR分析得知,土壤中吸附铀的官能团主要有—OH、COO—、C—O和—NH2。
中文关键词: 磷酸盐    吸附  迁移转化
Abstract:Soil around uranium mine tailings was taken as research object. Mechanism of soil adsorption of radionuclide uranium, rule of migration and transformation of uranium in soil and influence of occurrence form were studied through leaching experiments under action of different phosphates. The results show that with increase of leaching time, pH value of leachate rises because of exchange and desorption reaction between dihydrogen phosphate and hydroxyl in soil. After adding phosphate to soil, uranium concentration in leachate is lower than the discharge standard of mine wastewater. After leaching, uranium content in soil drops with increase of depth, and residual uranium content in soil rises obviously, which indicates that phosphate can fix uranium in soil to a certain extent, in which potassium dihydrogen phosphate has the best effect. FTIR analysis shows that main functional groups of uranium adsorption in soil are —OH, COO—, C—O and —NH2.
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基金项目:江西省自然科学基金资助项目(20171BAB203027);国家自然科学基金资助项目(21407023)
引用文本:
张子晴,陈井影,范镇荻.模拟降雨条件下不同磷酸盐对土壤吸附铀的影响[J].有色金属(冶炼部分),2021(10):96-101.
ZHANG Zi-qing,CHEN Jing-ying,FAN Zhen-di.Effect of Different Phosphate on Uranium Adsorption in Simulated Rainfall[J].Nonferrous Metals (Extractive Metallurgy),2021(10):96-101.

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