Study On Adsorption And Migration Of Uranium In Clay In Tailings

This paper explores the migration of adsorption behavior of uranium in claymedium, for risk assessment of the tailings and shallow provide evidence on thesuitability evaluation of the treatmentStatic adsorption experiment mainly explores the influence of various factors onthe clay adsorption uranium, and under the influence of various factors, clayadsorption distribution coefficient of uranium. In addition, in addition to the staticexperiment study of clay adsorption uranium, also in the migration of uranium in claysoil column experiment research, examines the leaching filtrate the acidity and theinfluence of the intensity of leaching of uranium migration.Static adsorption experiments, adsorption time, solid-liquid ratio, pH value andthe influence of the initial concentration of uranium and other factors on theadsorption behavior, Using multiple dynamic model and the thermodynamic equationfitting the experimental data and the fitting equation is obtained by analysis, byscanning electron microscope and infrared spectrum analysis and adsorptionmechanism. Static adsorption experiment results show that the pH value of2.0~2.0,clay adsorption of uranium increases with the increase of pH value, adsorption rate upto92.1%;In the best conditions of clay adsorption of maximum distributioncoefficient of4.9x104ml/g; The most conforms to the Langmuir adsorption isothermadsorption process model (R2=0.999); Conform to the dynamics equation of quasisecondary adsorption kinetics; Before and after adsorption clay shows that form moreobvious changes; Infrared spectra before and after adsorption changes smaller; Inaddition to physical adsorption process and chemical process.Migration of soil column experiment investigates the simulated acid rain anddifferent amount of leaching of uranium migration effect in clay. Through theleaching experiment of three months, Determine the largest uranium migrationdistance. Results show that under the leaching of90days, of leach solution pH valuewere decreased, the biggest drop two orders of magnitude, The largest uraniummigration distance, respectively, to12cm,13cm,16cm; Spray intensity, the greater the amount of the migration distance is more far.