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开展铀吸附研究,特别是铀在黏土矿物上的吸附行为研究,对处置库安全评价十分必要.叶腊石是自然界常见的黏土矿物,但是对叶腊石和铀相互作用的研究还较少.本文采用批式实验的方法研究了pH、离子强度等对铀在叶腊石上吸附行为的影响,还探讨了该吸附反应的热力学和动力学特性.结果表明,铀在叶腊石上的吸附受pH影响较大,受离子强度影响较小.铀在叶腊石上的吸附过程符合准二级动力学方程,Freundlich模型可以更好地拟合铀在叶腊石上的吸附行为.叶腊石吸附铀是一个自发进行的吸热反应.
Research on uranium adsorption, especially the adsorption behavior of uranium on clay minerals, is very necessary for the safety assessment of the reservoir.Palpolite is a common clay mineral in nature, but the research on the interaction between pyrophyllite and uranium is still little.In this paper, The effect of pH and ionic strength on the adsorption behavior of uranium on pyrophyllite was studied by means of the experimental method.The thermodynamic and kinetic properties of the adsorption reaction were also discussed.The results showed that the adsorption of uranium on pyrophyllite was greatly affected by pH , Which is less affected by ionic strength.The adsorption process of uranium on pyrophyllite accords with quasi-second-order kinetic equation and Freundlich model can better fit the adsorption behavior of uranium on pyrophyllite.The pyrite adsorption of uranium is a spontaneous absorption Thermal reaction.