Short communication: The dissolution of UK simulant vitrified high-level-waste in groundwater solutions

JOURNAL OF NUCLEAR MATERIALS

卷:538

Article

Fisher, Adam J.¹  Imran, Mohammed N. B.¹  Mann, Colleen¹  Gausse, Clemence¹  Hand, Russell J.¹  Hyatt, Neil C.¹  Corkhill, Claire L.¹ 

[1] Univ Sheffield, Dept Mat Sci & Engn, NucleUS Immobilisat Sci Lab, Sheffield S1 3JD, S Yorkshire, England

关键词: Aluminoborosilicate glass;    Nuclear waste;    Chemical durability;    Corrosion;    Zinc;    Magnesium;    Calcium;    Groundwater;   

DOI  :  10.1016/j.jnucmat.2020.152245

来源: Elsevier

【 摘 要 】

Dissolution of a simulant UK nuclear waste glass containing Mg, Ca and Zn was investigated over 35 d at 50 degrees C in ultra-high quality (UHQ) water and simulant groundwater solutions. The dissolution rates were influenced subtly by the groundwater composition, following the trend, from least to most durable: clay > UHQ water > granite approximate to saline. Solutions were rapidly silica saturated but boron dissolution rates continued to increase. This is hypothesised to be due to the formation of secondary Mg-silicate precipitates, preventing the formation of a passivating silica gel layer and allowing glass dissolution to proceed at close to the maximum rate. (c) 2020 The Authors. Published by Elsevier B.V.

【 授权许可】

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