Hydrolytic and thermal stability of magnesium potassium phosphate compound for immobilization of high level waste

被引：9
|
作者：
Vinokurov, Sergey E. [1 ]
Kulikova, Svetlana A. [1 ]
Myasoedov, Boris F. [1 ]
机构：
[1] Russian Acad Sci, Vernadsky Inst Geochem & Analyt Chem, 19 Kosygin St, Moscow 119991, Russia
来源：
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2018年 / 318卷 / 03期
基金：
俄罗斯科学基金会;
关键词：
Magnesium potassium phosphate compound; High level waste; Immobilization; Thermal stability; Leaching rate; Leaching mechanism;
D O I：
10.1007/s10967-018-6181-x
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The samples of the magnesium potassium phosphate (MPP) compound have been synthesized during solidification of high level waste (HLW) surrogate. The compound consists of a main phosphate phases Mg(1.1)Na(0.35)K(0.45)PO(4)x(4-6)H2O and MgCs(0.5)Na(0.2)K(0.3)PO(4)x(5-6)H2O. Differential leaching rates of Pu-239, Eu-152 and Sr-90 from the MPP compound after heat treatment (450 degrees C) are 7.8x10(-9); 1.7x10(-7) and 8.8x10(-6)gcm(-2) day(-1), respectively. The coefficient of thermal expansion of MPP compound(11.6 +/- 0.3)x10(-6)degrees C-1; coefficient of thermal conductivity averages 0.5Wm(-1)K(-1). The properties of MPP compound meet the regulatory requirements for solidified HLW.
引用
收藏
页码：2401 / 2405
页数：5
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