Dissolution of montmorillonite in compacted bentonite by highly alkaline aqueous solutions and diffusivity of hydroxide ions

Experimental and Modeling Study on Diffusion of Selenium under Variable Bentonite Content and Porewater Salinity

“…26) In addition, the amount of montmorillonite in compacted bentonite/sand mixtures did not decrease in a few months at pH 13 and 130 C in a previous study; 27) bentonite is not likely to be altered at pH 12 and room temperature during the experimental period.…”

Experimental study of the effect of pH on the kinetics of montmorillonite dissolution at 25°C

“…Heydemann, 1966;Novak and Č ičel, 1978;Kline and Fogler, 1981a,b;Furrer et al, 1993;Zysset and Schindler, 1996;Bauer and Berger, 1998;Cama et al, 2000;Huertas et al, 2001;Tournassat et al, 2003;Nakayama et al, 2004;Amram and Ganor, 2005;Choi et al, 2005a,b;Metz et al, 2005a,b;Sánchez et al, 2006;Golubev et al, 2006) that have considered dissolution-affecting processes including: formation of surface complexes, evolution of reactive surface area, effects of solution saturation, and rate control by steady state vs. initial dissolution reaction(s). The results are in some cases discrepant as they were obtained under different experimental conditions (batch or flowthrough reactors, far or close to equilibrium conditions), using different smectites (in addition to raw or pretreated, 0016-7037/$ -see front matter Ó 2008 Elsevier Ltd. All rights reserved.…”

Geochemical constraints on the stability of zeolites and C–S–H in the high pH reaction of bentonite

“…doi:10. 1016/j.gca.2009.10.042 values (initially 14-13) when NaOH is the dominant base (Vigil de la Villa et al, 2001;Nakayama et al, 2004), but the crystallisation sequence and the zeolite composition depend on the reactive conditions. For instance, the presence of KOH or higher temperatures favour the formation of phillipsite and K-feldspar or analcime, respectively (Bauer and Berger, 1998;Sánchez et al, 2006).…”