摘要
为研究α安息香肟(α-BO)沉淀法从低浓铀裂变产物中提取裂变^99Mo工艺,考察了 α-BO沉淀法提 取^99Mo的条件,包括温度、HNO3浓度、α-BO 与Mo摩尔比、辐照剂量、 U浓度对(α-80沉淀- Mo的影响, 探索了MoO2 (a-BO)2 沉淀的再溶解条件,测定了α-BO淀法对^131 I、 Sr、 Zr、 RU、 CS、 Ce、 U 等杂质元素的 去污系数,以及Mo回收率.结果表明,在室温下,当 HNO3 浓度为1 mol/L,α-BO Mo摩尔比大于2 时,在无水乙醇和0.4 mol/L NaOH两种 α-BO解体系下, Mo回收率均大于95%.保持辐照剂量率 为 5 000 Gy/h,α-BO淀法提取Mo的回收率随α-BO照剂量的增大而降低.辐照剂量低于8.25 X 105 Gy时,两种 α-BO解体系下, Mo回收率均大于85%.随着U浓度的上升, Mo回收率逐渐下降. MoO2(α-BO2沉淀可在15 min内溶于0. 5 mol/LNaOH溶液中.以上结果表明,采用 α-BO淀法分 离靶件溶解模拟液时,对 Sr、 Zr、 RU、 CS、 Ce、 I、 U 等杂质元素有较好的去污效果.研究结果可为低浓铀 生产裂变99 Mo提供参考.
To separate molybdenum-99 from fission products of low enriched uranium (LEU) by precipitation with a-benzoin oxime (a-BO), influences of temperature, con-centration of nitrate, molar ratio of a-BO to Mo, radiation dose and uranium concentra-tion on precipitating molybdenum with crBO had been evaluated. Re-dissolution of Mo02(a-BO)2 was performed. The decontamination factors of impurity elements inclu-ding strontium zirconium、 ruthenium、 cesium、 cerium、 iodine-131 and uranium had been determined. The recovery yield of Mo for the separation procedure was calculated.It showed that, at the room temperature, with 1 mol/L of nitric acid concentration ,higher than 2 of molar ratio of a-BO to Mo, when a-BO was dissolved in anhydrous eth-anol or 0. 4 mol/L sodium hydroxide solution, higher than 95% of Mo recovery yield could be obtained. Under the radiation dose rate of 5 000 Gy/h, when the radiation dose increased, Mo recovery yield decreased instead. When the total radiation dose of a-BO was below 8. 25 X 105 Gy, Mo recovery yield was higher than 85%. When uranium con-centration increased, Mo recovery yield decreased. Mo02 (crBO)2 precipitate could be dissolved in sodium hydroxide of 0. 5 mol/L within 15 minutes. Effective decontamina-tion for all major impurity elements including strontium, zirconium, ruthenium, cesium, cerium, iodine and uranium were observed. This study has paved the pay for further research for fission "Mo production.
出处
《同位素》
CAS
2016年第4期216-222,共7页
Journal of Isotopes
基金
国家科技部科技支撑计划项目(2014BAA03B01)
中国核工业集团公司优先发展项目
关键词
低浓铀
α安息香肟
沉淀法
分离
裂变钼
low enriched uranium
a-benzoin oxime
precipitation
separation
fission molybdenum