N,N,N’,N’-tetra-n-butylurea was synthesized by the means of “nonphosgene”.The extraction properties of dioxouranium(Ⅱ)from nitric acid solution by N,N,N’,N’-tetra-n-butylurea(TBU)were studied.The extraction law...N,N,N’,N’-tetra-n-butylurea was synthesized by the means of “nonphosgene”.The extraction properties of dioxouranium(Ⅱ)from nitric acid solution by N,N,N’,N’-tetra-n-butylurea(TBU)were studied.The extraction laws of dioxouranium(Ⅱ)with TBU were similar to that with tributyl-phosphate(TBP).Its extracting ability was bitter lower than that of TBP.In the all experiment condition,the third phase doesn’t appear.Its solvation number to dioxouranium was 2.展开更多
采用空气冷却的方式,在FLi Na K熔盐体系中开展了熔盐冷冻壁的形成工艺实验,考察了冷冻壁形成状态、温度分布及传热规律等。结果表明,冷冻壁形成过程中熔盐凝固界面沿逆热流方向逐渐推进,厚度增长速率与冷却热流量正相关,径向温度分布...采用空气冷却的方式,在FLi Na K熔盐体系中开展了熔盐冷冻壁的形成工艺实验,考察了冷冻壁形成状态、温度分布及传热规律等。结果表明,冷冻壁形成过程中熔盐凝固界面沿逆热流方向逐渐推进,厚度增长速率与冷却热流量正相关,径向温度分布及传热规律均符合理论预期,但不同高度上换热不均导致轴向上冷冻壁厚度有一定差异,需考虑熔盐自然对流的影响并优化容器外壁换热方式。研究结果可为配置冷冻壁功能设备的设计尤其是换热器结构的优化提供数据支撑。展开更多
文摘N,N,N’,N’-tetra-n-butylurea was synthesized by the means of “nonphosgene”.The extraction properties of dioxouranium(Ⅱ)from nitric acid solution by N,N,N’,N’-tetra-n-butylurea(TBU)were studied.The extraction laws of dioxouranium(Ⅱ)with TBU were similar to that with tributyl-phosphate(TBP).Its extracting ability was bitter lower than that of TBP.In the all experiment condition,the third phase doesn’t appear.Its solvation number to dioxouranium was 2.
文摘采用空气冷却的方式,在FLi Na K熔盐体系中开展了熔盐冷冻壁的形成工艺实验,考察了冷冻壁形成状态、温度分布及传热规律等。结果表明,冷冻壁形成过程中熔盐凝固界面沿逆热流方向逐渐推进,厚度增长速率与冷却热流量正相关,径向温度分布及传热规律均符合理论预期,但不同高度上换热不均导致轴向上冷冻壁厚度有一定差异,需考虑熔盐自然对流的影响并优化容器外壁换热方式。研究结果可为配置冷冻壁功能设备的设计尤其是换热器结构的优化提供数据支撑。
