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为了解镎在萃取过程中的化学行为,采用单级萃取研究了硝酸溶液中Np(Ⅴ)氧化为Np(Ⅵ)的行为和此过程中TBP萃取Np(Ⅵ)的性能。实验结果表明,提高硝酸浓度有利于Np(Ⅴ)的氧化,提高了萃取体系对Np(Ⅵ)的萃取;提高亚硝酸浓度加快了Np(Ⅵ)和Np(Ⅴ)之间氧化还原反应的进行,但是会降低平衡后萃取系统中Np(Ⅵ)的比例;升高温度可以提高Np(Ⅴ)转化为Np(Ⅵ)的速率。通过模拟1AF料液的混合澄清槽台架实验表明,自1AX中引入0.01 mol/L HNO2,同时将萃取温度升高到45℃,在1AF硝酸浓度为3.5mol/L的条件下,1A槽镎的萃取率可以达到80%。
In order to understand the chemical behavior during the extraction process, single-stage extraction was used to investigate the oxidation of Np (Ⅴ) to Np (Ⅵ) in nitric acid solution and the extraction of Np (Ⅵ) by TBP in this process. The experimental results showed that increasing the concentration of nitric acid was favorable for the oxidation of Np (Ⅴ) and the extraction of Np (Ⅵ) by the extraction system. The increase of nitrite concentration accelerated the redox reaction between Np (Ⅵ) and Np (Ⅴ) , But it will decrease the proportion of Np (Ⅵ) in the extraction system after the equilibration. Increasing the temperature can increase the Np (Ⅴ) to Np (Ⅵ) rate. Experimental results show that 1 mol / L HNO 2 is introduced from 1AX and the extraction temperature is increased to 45 ℃. Under 1AF nitric acid concentration of 3.5 mol / L, the 1A tank 镎The extraction rate can reach 80%.