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本文用模拟料液,研究了以萃取法为基本方法,从核燃料后处理废液中提取贵金属铑和钯。所得产品铑和钯的化学纯度分别大于99.9％和99.95％。该流程中铑和钯的收率均在90％以上。几个主要的长寿命放射性核素(~(90)Sr/~(90)Y、~(106)Ru/~(106)Rh、~(125)Sb、~(137)Cs、~(144)Ce/~(144)Pr和~(147)Pm)对产品钯都没有沾污。~(137)Cs对产品铑没有沾污。产品铑对~(90)Sr/~(90)Y、~(106)Ru/~(106)Rh、~(125)Sb、~(144)Ce/~(144)Pr和~(147)Pm的放射性去污系数分别为2.4×10~6、5.2×10~4、9.0×10~4、9.6×10~6和4.1×10~6。经加反载体纯化(对~(147)Pm未进行此实验),产品铑对~(106)Ru/~(106)Rh的放射性去污系数为6.2×10~7,对上述其它几种核素都达到完全去污。
In this paper, simulated feed solution was used to study the extraction method as the basic method to extract the precious metal rhodium and palladium from the nuclear fuel post-treatment waste liquid. The chemical purity of the resulting products, rhodium and palladium, is greater than 99.9% and 99.95%, respectively. The yield of rhodium and palladium in the process is over 90%. Several major long - lived radionuclides (~ (90) Sr / ~ (90) Y, ~ 106 Ru / ~ 106 Rh, 125 Sb, 137 Cs, Ce / ~ (144) Pr and ~ (147) Pm) were not contaminated with the product palladium. ~ (137) Cs No rhodium product contamination. The results show that the rhodium has a good catalytic activity for the conversion of ~ (90) Sr / ~ (90) Y, ~ 106 Ru / ~ (106) Rh, ~ 125 Sb, ~ 144 Ce / ~ 144 Pr and ~ 147 Pm The radioactivity decontamination coefficients were 2.4 × 10 ~ 6, 5.2 × 10 ~ 4, 9.0 × 10 ~ 4, 9.6 × 10 ~ 6 and 4.1 × 10 ~ 6, respectively. The radioactivity decontamination coefficient of Rh (106) Ru / ~ (106) Rh was about 6.2 × 10 ~ 7 for the rhodium product after adding anti-vector purification (~ 147 147 Pm did not do this experiment) All are completely decontaminated.