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REVISTA DE CHIMIE
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https://doi.org/10.37358/Rev.Chim.1949

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Revista de Chimie (Rev. Chim.), Year 2008, Volume 59, Issue 1, 74-78

https://doi.org/10.37358/RC.08.1.1711

Mihaela Bragea, Delia Perju, Gheorghiţa Jinescu, Laszlo Toro, Carmen Cristache

Experimental Modelling of the Radionuclides Diffusion Process in Uranifer Tailing Dum

Abstract:

Generally, the uranifer tailings dump are not protected. During the time appear chemical and physical modifications which favour spreading of the radioactive contaminant into the environment, because of the waters provided from precipitations with pH variation (acid rainfall, snow), solar radiance, variation of temperature and humidity, interaction of different minerals from the waste rock with infiltration water during the flow, leading to precipitations phenomenon, ionic exchange, adsorption and re-dissolving [2]. As a rule, the speed of radionuclides diffusion from radioactive tailings dump depends on each of these factors and is very specific to the hydro and geochemistry of the nearest rocks [7]. Because of that, the scientific research is very difficult and will obliges us to study through the simplified physical systems but maintaining the important parameters which are influencing the diffusion process of the contaminant in the environment. The main objective of this paper is to characterize hydro and geochemistry properties controlling the migration of radionuclides extracted from tailings dump into the environment, including the processes of sorption and adsorption and neglecting other physical processes as precipitation, ion exchange or some other geochemical interactions within the system. For this purpose we made studies on 226Ra and Unat extraction from uranifer tailings dump analyzed in pure water in dynamic system, studies about the influence of clay presence on speed of diffusion process in sorption and adsorption phenomenon. Finally we made a prediction for long term about variation of concentrations of 226Ra and Unat based on experimental data using some software programs from literature [8].
Keywords:
adsorption; prediction; migration; clay; radioactive waste

Issue: 2008, Volume 59, Issue 1
Pages: 74-78
Publication date: 09/02/2008
https://doi.org/10.37358/RC.08.1.1711
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This article is published under the Creative Commons Attribution 4.0 International License
 
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