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核技术  2015 

稀土氟化物在硝酸中溶解性质的研究

DOI: 10.11889/j.0253-3219.2015.hjs.38.110304, PP. 110304-110304

Keywords: 微波消解,电感耦合等离子体原子发射光谱,稀土氟化物,硝酸,溶解

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Abstract:

采用微波消解-电感耦合等离子体原子发射光谱(InductivelyCoupledPlasmaAtomicEmissionSpectroscopy,ICP-AES),系统研究了钍铀燃料循环后处理中4种典型稀土氟化物(NdF3、EuF3、GdF3、CeF3)在硝酸中的溶解性质。结果表明,在10mL、浓度为16mol?L?1的硝酸中,微波消解2h,190oC下,4种稀土氟化物的最大溶解量可达2.5?3.9g?L?1,均比文献报道的数值高2?3个数量级;采用ICP-AES测试溶解液,线性范围0.99947?0.99996,标准偏差SD≤4.2%(n=3),该溶解方法旨在为核燃料后处理流程中含有难溶稀土氟化物的熔盐固溶体样品分析前处理提供参考。

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