用电解精炼法回收和纯化铀和钚的研究Ⅰ．铀－锆合金芯块的直接溶解

STUDIES ON THE RECOVERY AND PURIFICATION OF URANIUM AND PLUTONIUM BY ELECTREFINING Ⅰ.DIRECT DISSOLUTION OF U-10Zr ALLOY IN LIQUID CADMIUM

采用直接溶解法，研究了时间、温度、搅拌与否及芯块表面积等参数对铀－锆合金在液态镉中的溶解影响。实验结果表明，在４００℃和５００℃、搅拌速度约为１５０ｒ／ｍｉｎ时，铀在液态镉中的溶解度分别为０．４ｇ和２．２ｇ；初始０．５ｈ时，铀溶解速度分别为０．３２ｇ／ｃｍ￣２·ｈ和０．０５ｇ／ｃｍ￣２·ｈ。Ｕ－１０Ｚｒ合金芯块在液态镉中（液态镉与Ｕ－１０Ｚｒ芯块质量比约为７）直接溶解的合适条件为：溶解温度约４８０℃，搅拌速度约１５０ｒ／ｍｉｎ，溶解时间约４ｈ。

he effects of time,temperature,total surface area of pellets and stirring on the solubilityand dissolution rate of uranium in liquid cadmium are studied.The experimental results show thatat 500℃ or 400℃ with the stirring rate of some 150r/min ,the solubilities of uranium in liquidcadmium are 2.2g and 0.4g,respectively. At the first 30 min,the dissolution rates of U-10Zr al-loy pellets are 0.32g/cm￣2·h and 0.05g/cm￣2·h,respectively.The suitable dissolution conditionsfor U-10Zr alloy pellets in liquid cadmium(the ratio of the quality of liquid cadmium to that ofthe pellets≈7)are:temperature,about 480℃;stirring rate,about 150r/min,time,4h.