The effect of iron on montmorillonite stability. (I) Background and thermodynamic considerations

Wilson, James A.; Savage, David; Cuadros, Javier; Shibata, Masahiro; Ragnarsdottir, KV

doi:10.1016/j.gca.2005.10.003

Cited by 98 publications

(77 citation statements)

References 80 publications

(104 reference statements)

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“…14 Finally, it is remarkable that no phases resulting from minireactor degradation, 15 or europium silicate bearing phases were detected in the reacted bentonite. 16 The SEM micrographs of FEBEX before and after hydrothermal treatment are 17 shown in Fig. 3.…”

Section: Characterization Methodsmentioning

confidence: 99%

Competitive effect of the metallic canister and clay barrier on the sorption of Eu3+ under subcritical conditions

Mrabet

Castro

Hurtado

et al. 2014

Applied Geochemistry

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13An in depth knowledge and understanding of high activity radionuclide (HLRW) 14 immobilization processes on the materials composing the engineered barrier (clay and 15 metallic canister) is required to ensure the safety and the long-term performance of 16 radioactive waste disposal procedures. Therefore, the aim of this study was to 17 understand the mechanisms involved in the retention of Eu 3+ by two components of the 18 multibarrier system, the bentonite barrier and the canister. As such, a comparative study 19 of the interaction of trivalent Eu 3+ , used to simulate trivalent actinides, with both 20 bentonite and a metallic canister has been undertaken in this work. To this end, we 21 designed a minireactor into which the bentonite was introduced and compacted. The 22 minireactor-bentonite system was then submitted to a hydrothermal reaction with a 23 7.9·10

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Section: Characterization Methodsmentioning

confidence: 99%

Competitive effect of the metallic canister and clay barrier on the sorption of Eu3+ under subcritical conditions

Mrabet

Castro

Hurtado

et al. 2014

Applied Geochemistry

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“…In a large number of experiments, the pH at the interface (which is difficult to measure in integrated experiments), or the pH of solutions in batch experiments, is slightly alkaline as a result of the corrosion process, with values increasing up to about 9e10 (Wilson et al, 2006b;De Combarieu et al, 2007: Perronnet et al, 2007Ishidera et al, 2008;Perronnet et al, 2008). This pH perturbation is responsible for the presence of a transformed clay mineral layer showing systematic dissolution of primary clay minerals: in experiments with clay-rocks, illite, and I-Sm (Jodin-Caumon et al, 2012) tend to dissolve preferentially along with the occasional destabilization of quartz and dolomite (Bourdelle et al, 2014).…”

Section: Steel Corrosion In Claymentioning

confidence: 99%

Stability of Clay Barriers Under Chemical Perturbations

Bildstein

Claret

2015

Natural and Engineered Clay Barriers

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“…The interaction between bentonite and iron (Fe) has been investigated to model montmorillonite stability and the evolution of the waste canister -bentonite buffer interface through time (Wilson et al, 2006;Marty et al, 2010) and its dependence on alkalinity (Charpentiera et al, 2006) or salinity (Milodowski et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Monitoring water-chemistry evolution in the bentonite buffer using magnets: Effects of corrosion on buffer stability

Rigonat¹,

Mavris²,

Harley³

et al. 2016

Filling the Gaps - From Microscopic Pore Structures to Transport Properties In Shales

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Bentonite has been chosen as a buffer material by several national nuclear-waste management companies because of its swelling capacity and low water permeability, and because it retards the transport of radionuclides and corrosion products toward the geosphere. The aim of the present study was to develop a magnetic material that has the ability to detect changes in groundwater compositions in an underground nucleardeposit facility through variation in its magnetic properties with time.The present study has investigated the effect of the corrosion of NdFeB magnets on the Na-bentonite buffer under different environmental conditions. Seven different aqueous solutions were used for long-time exposure tests (708C, 5 months) with fragments of NdFeB magnets and powdered Na-bentonite. The corrosion of NdFeB alloy had no detectable effect on the mineralogy of the clay minerals, and any change on the bentonite matrix, measured through X-ray diffraction analysis, was related to the different initial chemistry of the solutions.

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The effect of iron on montmorillonite stability. (I) Background and thermodynamic considerations

Cited by 98 publications

References 80 publications

Competitive effect of the metallic canister and clay barrier on the sorption of Eu3+ under subcritical conditions

Competitive effect of the metallic canister and clay barrier on the sorption of Eu3+ under subcritical conditions

Stability of Clay Barriers Under Chemical Perturbations

Monitoring water-chemistry evolution in the bentonite buffer using magnets: Effects of corrosion on buffer stability

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