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研究了一种处理高燃耗钍铀燃料的酸式Thorex流程。该流程的特点在于在钍铀共萃取中避免采用欠酸进料而采用酸性进料,同时采用计算机优化选择最佳工艺参数并加若干有效强化措施(料液加肼加热予处理,洗涤液中加少量EDTA,双酸洗涤等)使单循环流程的去污效果与欠酸进料流程相接近。铀线-循环加低浓度TBP的补充萃取净化,铀产品总γ去污系数大于10~7。
An acid Thorex process for the treatment of high-burn thorium-uranium fuels was studied. The process is characterized by avoiding the use of acid feed in the thorium-uranium co-extraction with acidic feedstocks, using computer optimization to select the optimum process parameters and adding several effective strengthening measures (feed liquid plus hydrazine heating to treat, washing liquid Plus a small amount of EDTA, double acid washing, etc.) so that the single-cycle decontamination effect and sub-acid feed process are close. Uranium line - cycle plus low concentration of TBP supplement extraction purification, total uranium gamma decontamination factor greater than 10 ~ 7.