Abstract In the UK, the Waste Vitrification Plant (WVP) at Sellafield converts the highly active liquid (HAL) waste from the reprocessing of spent nuclear fuel into a glass wasteform suitable for long term storage and disposal. After the completion of reprocessing operations, the highly active liquor (HAL) storage tanks will be emptied and washed out to remove any accumulated solids. These solids are expected to contain high concentrations of molybdenum. Hence, a new glass formulation has been developed specifically for immobilisation of these waste streams. This ‘Ca/Zn’ glass allows for significantly higher waste loadings by the formation of CaMoO4 crystals when the Mo content exceeds its solubility limit in the glass. The product quality of the new Ca/Zn glass is currently undergoing validation, which includes measuring the chemical durability to demonstrate its suitability for long-term storage and disposal. Previous powder-based leach tests have indicated a very slow approach to the low residual dissolution rate regime in contrast to other HLW glasses. Hence, this study investigated the leaching of Ca/Zn glass powders in Si-saturated solutions at high surface area to volume ratios in order to probe the long-term dissolution rate.

中文翻译：

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英国玻璃化高放废物在硅饱和溶液中的化学耐久性

摘要 在英国，塞拉菲尔德的废物玻璃化工厂 (WVP) 将来自乏核燃料后处理的高活性液体 (HAL) 废物转化为适合长期储存和处置的玻璃废物形式。后处理操作完成后，高活性液体 (HAL) 储罐将被清空并冲洗干净，以去除任何积聚的固体。这些固体预计含有高浓度的钼。因此，专门开发了一种新的玻璃配方来固定这些废物流。当 Mo 含量超过其在玻璃中的溶解度极限时，这种“Ca/Zn”玻璃会通过形成 CaMoO4 晶体来显着增加废物负载。新型钙锌玻璃的产品质量目前正在验证中，这包括测量化学耐久性以证明其适合长期储存和处置。以前的粉末浸出试验表明，与其他 HLW 玻璃相比，采用一种非常缓慢的方法来实现低残留溶解速率。因此，本研究调查了 Ca/Zn 玻璃粉末在高表面积与体积比的 Si 饱和溶液中的浸出，以探查长期溶解速率。