Silica-based waste form for immobilization of iodine from reprocessing plant off-gas streams

被引：31
|
作者：
Matyas, Josef [1 ]
Canfield, Nathan [2 ]
Sulaiman, Sannoh [1 ]
Zumhoff, Mac [1 ]
机构：
[1] Pacific NW Natl Lab, Radiol Mat & Technol Dev, POB 999, Richland, WA 99352 USA
[2] Pacific NW Natl Lab, Electrochem Mat & Syst, POB 999, Richland, WA 99352 USA
来源：
JOURNAL OF NUCLEAR MATERIALS | 2016年 / 476卷
关键词：
Immobilization; Iodine; Silver-functionalized silica aerogel; Hot uniaxial pressing; Hot isostatic pressing; Silica-based waste form;
D O I：
10.1016/j.jnucmat.2016.04.047
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A high selectivity and sorption capacity for iodine and a feasible consolidation to a durable SiO2-based waste form makes silver-functionalized silica aerogel (Ag-aerogel) an attractive choice for the removal and sequestration of iodine compounds from the off-gas of a nuclear fuel reprocessing plant. Hot uniaxial pressing of iodine-loaded Ag-aerogel (20.2 mass% iodine) at 1200 degrees C for 30 min under 29 MPa pressure provided a partially sintered product with residual open porosity of 16.9% that retained -93% of sorbed iodine. Highly iodine-loaded Ag-aerogel was successfully consolidated by hot isostatic pressing at 1200 degrees C with a 30-min hold and under 207 MPa. The fully densified waste form had a bulk density of 3.3 x 10(3) kg/m(3) and contained -39 mass% iodine. The iodine was retained in the form of nano- and micro-particles of AgI that were uniformly distributed inside and along boundaries of fused silica grains. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：255 / 261
页数：7
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