HIGH LEVEL WASTES IMMOBILIZATION IN CERAMIC AND HYDRATED PHOSPHATE MATRIX
Abstract
The results of experimental research for obtaining of phosphate matrix materials: fluorapatite Ca10(PO4)6F2, sodium zirconium phosphate NaZr2(PO4)3 and potassium magnesium phosphate KMgPO4·6H2O were presented. The evolution of phase composition in their synthesis was investigated. The optimal parameters for obtaining monophasic phosphate matrix materials were found. Possibility of obtaining powders of calcium Ca10(PO4)6F2 and strontium-containing Ca9Sr(PO4)6F2 fluorapatites by both solid phase reaction method with subsequent heat treatment and chemical co-precipitation method from solutions of the initial components was investigated. Nanosized zirconium orthophosphate powders NaZr2(PO4)3 were synthesized by the sol-gel method. Hydrated phosphatic matrices KMgPO4·6H2O by a chemical reaction between MgO and KH2PO4 in water at a room temperature were obtained. The requirements for high-level waste matrix were presented. The suitability of the use of synthetic phosphate materials as a matrix for the immobilization of high level nuclear wastes was determined.
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