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Physicochemical relationships during a KCl-bentonite hydrothermal reaction

Published online by Cambridge University Press:  09 July 2018

J. Linares ,
F. Huertas ,
E. Caballero  and
C. Jimenez de Cisneros
J. Linares
Affiliation:
Estación Experimental del Zaidin, CSIC, Profesor Albareda, 1, 18008, Granada, Spain
F. Huertas
Affiliation:
Estación Experimental del Zaidin, CSIC, Profesor Albareda, 1, 18008, Granada, Spain
E. Caballero
Affiliation:
Estación Experimental del Zaidin, CSIC, Profesor Albareda, 1, 18008, Granada, Spain
C. Jimenez de Cisneros
Affiliation:
Estación Experimental del Zaidin, CSIC, Profesor Albareda, 1, 18008, Granada, Spain
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Abstract

A dioctahedral bentonite was treated hydrothermally with KCI solutions (0.025-1 M) at different temperatures (60-200°C) and times (1-360 days) to evaluate its use as a barrier for radioactive waste disposal. Equations relating adsorbed K on smectite with initial and equilibrium K concentrations in solution, temperature and time have been obtained. These equations are useful for modelling the influence and behaviour of these variables and contribute to the performance assessment calculations for radioactive waste repositories. Likewise, the thermodynamic parameters of the K adsorption process have been calculated. Other relationships, including silica in solution and pH, are also shown.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 3 , September 1998 , pp. 475 - 482
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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