期刊
RADIOCHEMISTRY
卷 60, 期 1, 页码 70-78出版社
PLEIADES PUBLISHING INC
DOI: 10.1134/S1066362218010125
关键词
mineral-like phosphate compounds; radioactive waste solidification; leaching
资金
- Russian Science Foundation [16-13-10539]
- Russian Science Foundation [16-13-10539] Funding Source: Russian Science Foundation
Low-temperature mineral-like magnesium potassium phosphate (MPP) compounds were synthesized in the course of immobilization of nitric acid solutions containing cesium, strontium, sodium, ammonium, lanthanum, and iron as simulated radioactive waste (RW). The phase composition and structure of the compounds and the distribution of the RW components were studied. The mechanical strength (15 +/- 3 MPa), heat resistance (up to 450 degrees C), and radiation resistance (absorbed dose 1 MGy) of the compounds were evaluated in accordance with the existing regulations. The MPP compound exhibits high hydrolytic durability: The differential leach rate of Pu-239 and Eu-152 on the 28th day, measured in accordance with GOST (State Standard) R 52 126-2003, is 2.1 x 10(-6) and 1.4 x 10(-4) g cm(-2) day(-1), respectively. Introduction of wollastonite into the compound decreases the radionuclide leach rate by a factor of up to 5. The MPP compound shows promise for industrial solidification of liquid RW, including high-level highly saline multicomponent actinide-containing waste.
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