Effect of clayey groundwater on the dissolution rate of SON68 simulated nuclear waste glass at 70 °C

Echave, T. De; Tribet, M.; Jollivet, Patrick; Marques, Caroline; Gin, Stéṕhane; Jégou, Christophe

doi:10.1016/j.jnucmat.2018.03.013

Cited by 18 publications

(5 citation statements)

References 34 publications

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“…The formation of the gel competes with the formation of other secondary minerals [3][4][5][6][7][8][9]. As an illustration, some experiments show the presence of gel dissolution patterns under neoformed secondary phases [10,11]. Finally, the geochemical modeling of nuclear glasses alteration is based on the respective solubilities of the gel and secondary phases [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of pH on the stability of passivating gel layers formed on International Simple Glass

Fournier

Ducasse

Pérez

et al. 2019

Journal of Nuclear Materials

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It is known for decades that silica saturated solutions allow borosilicate glass to dissolve much slower than in deionized water. The present study assesses this assertion in the specific case of the International Simple Glass, a 6-oxide borosilicate glass of nuclear interest, which we altered between pH = 1 and 10.7 at 90 °C. Depending on the stage of reaction, aqueous silica can promote either the formation of a passivating gel layer on the glass surface or the precipitation of certain secondary phases at the expense of the passivating gel. We demonstrate a negligible effect of aqueous silica at acidic pH and a marked effect beyond pH90 °C = 7, ensuring a better glass chemical durability. At higher reaction progress and above pH90 °C = 9.5, this effect becomes negative due to the formation of secondary phases such as hydroxides or zeolites.

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Section: Introductionmentioning

confidence: 99%

Effect of pH on the stability of passivating gel layers formed on International Simple Glass

Fournier

Ducasse

Pérez

et al. 2019

Journal of Nuclear Materials

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“…Molecular dynamics and Monte Carlo simulations are promising means to decipher the structure and properties of nanoporous networks 20,[49][50][51] , but more work is needed to parameterize laws for reactive transport models. Furthermore, although we have focused on a simple glass that does not form secondary silicate minerals, borosilicate nuclear waste glasses are known to form phyllosilicates, calcium silicate hydrates, and/or zeolites as corrosion products [52][53][54][55][56] . The precipitation of these minerals disrupts the passivating layer [57][58][59] .…”

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confidence: 99%

Insights into the mechanisms controlling the residual corrosion rate of borosilicate glasses

et al. 2020

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Borosilicate glasses are widely used to confine high-level radioactive wastes. The lifetime of these materials could reach hundreds of thousands of years if leaching of the glass into groundwater enables the formation of a passivating gel layer. Even in this regime, the glass will never stop corroding as thermodynamic equilibrium between glass and solution cannot be achieved. Therefore, accurate predictions of glass durability including passivation, require a deep understanding of the mechanisms controlling the so-called residual rate. However, despite tremendous efforts, these mechanisms remain poorly understood. Here, focusing on the behavior of the soluble elements of the International Simple Glass (B, Na, and Ca), we show that the residual rate is controlled by the behavior of B, a glass former supposed to dissolve instantaneously when in contact with water and thus widely considered as an ideal tracer. We then demonstrate that B release is controlled by multiple processes highly dependent on the pH. At the beginning of the passivating layer formation, the hydrolysis of B-O-Si linkages is rate-limiting and has an activation energy of ∼60 kJ mol−1, a value slightly lower than that for breaking Si-O-Si linkages. Once the fraction of closed pores resulting from gel restructuring is high enough, then diffusion of both reactants (water molecules) and some products (mainly Baq, Caaq) through the growing gel layer becomes rate-limiting. Consequently, B and Ca accumulate in an inner layer referred to as the active zone, with potential feedback on the B-O-Si hydrolysis. A new paradigm, including B as a key element of the system, is proposed to develop a comprehensive model for the corrosion of borosilicate glass.

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“…In conducting research, development, and utilization of nuclear technology, XYZ Radioactive Industries also produces hazardous waste with non-radioactive waste. This hazardous waste will harm health and pollute the environment if not manage with good management (De Echave et al, 2018;Pearce et al, 2016…”

Section: Introductionmentioning

confidence: 99%

Design of Hazardous Waste Station in Xyz Radioactive Industry

Prameswari¹,

Nurhadi²,

Rizaldi³

et al. 2020

envirotek

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A hazardous waste station must be designed following Regulation of the Minister of Environment and Forestry Number P.12 of 2020 concerning the Storage of Hazardous Waste so as not to cause environmental impacts. The purpose of this design is to improve the design criteria for the hazardous waste station in accordance with applicable regulations. The type and volume of hazardous waste storage have jerry can shape in 60 and 30-liter volumes, HDPE drum, and pallet. Each container is equipped with a symbol and label. Hazardous liquid waste and hazardous solid waste are designed with the dimensions of 10.66m x 8.2m and 8.65m x 8.2m. Each is equipped with coordinate, spill kit, fire extinguisher, pallet, shower & eyewash, and container. The new design of hazardous waste selected has met the requirements in the regulation, safe from outside interference and environmental impacts.

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Effect of clayey groundwater on the dissolution rate of SON68 simulated nuclear waste glass at 70 °C

Cited by 18 publications

References 34 publications

Effect of pH on the stability of passivating gel layers formed on International Simple Glass

Effect of pH on the stability of passivating gel layers formed on International Simple Glass

Insights into the mechanisms controlling the residual corrosion rate of borosilicate glasses

Design of Hazardous Waste Station in Xyz Radioactive Industry

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Effect of clayey groundwater on the dissolution rate of SON68 simulated nuclear waste glass at 70 °C

Cited by 18 publications

References 34 publications

Effect of pH on the stability of passivating gel layers formed on International Simple Glass

Effect of pH on the stability of passivating gel layers formed on International Simple Glass

Insights into the mechanisms controlling the residual corrosion rate of borosilicate glasses

Design of Hazardous Waste Station in Xyz Radioactive Industry

Contact Info

Product

Resources

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Effect of clayey groundwater on the dissolution rate of SON68 simulated nuclear waste glass at 70 °C