首页|A novel Sr2Nd8 (SiO4)(6)O-2 glass-ceramics for rapid immobilization of FP and An(3+) co-doped uranium tailings by microwave sintering: mechanism and performance
A novel Sr2Nd8 (SiO4)(6)O-2 glass-ceramics for rapid immobilization of FP and An(3+) co-doped uranium tailings by microwave sintering: mechanism and performance
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NSTL
Elsevier
Oxyapatite (general formula: A(2)(I)A(8)(II) (BO4)(6)O-2) is a potential material for immobilization of nuclear waste. Here, a novel Sr2Nd8(SiO4)6O(2) glass-ceramics (GCs) derived from uranium tailings were synthesized by consecutive microwave sintering technology at 1200 degrees C for simultaneous immobilization of simulated bivalent fission product (FP) Sr and trivalent actinide (An(3+)) Nd. Sr and Nd were successfully immobilized into A(2)(I) and A(8)(II) acceptor sites of oxyapatite respectively, and glass structures. The phase evolution, microstructure, physical property, and radon exhalation of as-prepared sintered forms were systematically investigated by XRD, FT-IR, SEM-EDS, TEM, and RAD7 radon meter. The experimental results demonstrated that the ultimate solid solubility of Sr reached 25 wt.%, while Nd exceeded 30 wt.% at 1200 degrees C. Importantly, the solidified samples exhibited homogenous and dense microstructure, and the radon exhalation rate improved with the increase of pore. It was indicated that oxyapatite glass-ceramics could be a potential matrix for the simultaneous immobilization of bivalent FP and An(3+). (c) 2022 Elsevier B.V. All rights reserved.
NSTL
Elsevier
