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试验考察了以7301,TBP,P204和醋酸丁脂+煤油组成的混合萃取体系对硫酸铀酰的萃取情况,同时分别考察了7301,TBP,P204和醋酸丁脂各组分对铀纯化效果的影响。通过小型试验、台架试验和扩大试验,筛选出混合萃取体系的最佳组成,同时确定了以黄饼为原料制备核电级U3O8的工艺流程和工艺参数。试验结果表明:醋酸丁脂虽有助于两相的分离,但溶解损失过大,不宜用作相改良剂;阳离子萃取剂P204可萃取一定量的阳离子杂质,不宜加入;中性分子萃取剂TBP与三脂肪胺一同使用时,其相改良剂的作用优于传统的高碳醇,需要加入;阴离子萃取剂7301可以萃取硫酸铀酰溶液中呈阴离子状态的UO2(SO4)32-。最终确定新混合萃取体系为7301+TBP的煤油溶液。
The effects of 7301, TBP, P204 and butyl acetate on the purification of uranium were investigated in a mixed extraction system composed of 7301, TBP, P204 and butyl acetate + kerosene. . The optimum composition of the mixed extraction system was screened through small scale test, bench test and expansion test. The technological process and process parameters for preparing U3O8 with yellow cake as raw material were also determined. The experimental results show that although butyl acetate can contribute to the separation of two phases, the dissolution loss is too large and should not be used as phase modifier. Cation extractant P204 can extract a certain amount of cationic impurities and should not be added. Neutral molecular extraction agent TBP When used together with tri-fatty amines, its phase-modifying agent performs better than traditional higher alcohol alcohols and needs to be added. Anionic extractant 7301 can extract UO2 (SO4) 32- in anionic state from uranyl sulfate solution. Finally, the kerosene solution of 7301 + TBP was determined for the new mixed extraction system.