IMMOBILISATION METHOD OF LIQUID RADIOACTIVE WASTE TO CERAMICS Russian patent published in 2011 - IPC G21F9/16 

FIELD: power industry.

SUBSTANCE: immobilisation method of liquid radioactive waste to ceramics involves concentration of radioactive solutiona, its mixing with phosphate matrix and further heat treatment. Waste concentrated to the level of high-active waste is calcinated after having been mixed with bone phosphate till ceramic sinter is obtained. Sinter is capsulated into glass. All the process stages are performed in one and the same reaction vessel. Vitrification is performed at temperatures not exceeding 1000°C. Invention allows obtaining stable mineral-like structural forms: kosnarite [(Na, Cs, Sr, Ln)(Zr, An, Fe)2(PO₄)3], monazite [(Ln, An)PO₄], zirconium oxide [(Zr, Ln, An)O₂], which have essentially large capacity approximately in relation to all radionuclides.

EFFECT: during one process both fixing of radionuclides to stable polycrystalline matrix, and creation of additional physical barrier in the form of glass capsule takes place.

2 cl, 3 ex