铁氧体法处理核电厂含Co^(2+)离子放射性废水的模拟试验

Simulated Tests of Treatment for Radioactive Wastewater Containing Co^(2+) Ion in Nuclear Power Plant by Means of Ferrite Process

该试验以59Co作为模拟非放射性同位素,在硼酸存在的条件下研究了铁氧体法去除模拟核电厂放射性废水中Co2+离子的各种工艺条件,结果表明铁氧体法可以有效去除模拟核电厂废水中的Co2+离子。当废水中Co2+离子浓度为5 mg/L、硼酸浓度(以硼计)为1 000 mg/L时,最佳工艺条件:反应时间为60 min、Fe2+/Co2+物质的量比为20∶1、Fe3+/Fe2+物质的量比3∶1、反应温度为40℃、pH为11。在此条件下出水Co2+离子浓度约0.5μg/L,净化因子达到10 000。

59Co was used as the simulated material of non-radioactive isotope in this experiment. The process parameters of ferrite method were investigated to remove Co2＋ ion from simulated radioactive wastewater containing boric acid in nuclear power plant. The results show that ferrite process can efficiently remove Co2＋ ion from the simulated wastewater. When the wastewater contains 5 mg/L Co2. ion and 1 000 mg/L boric acid （as B）, the optimum process parameters are as follows： reaction time is 60 min, Fe2＋/Co2＋ molar ratio is 20 ： 1, Fe3＋/Fe2＋ molar ratio is 3 ： 1, reaction temperature is 40℃ and pH is 11. Under these conditions concentration of Co2＋ ion in effluent is around 0.5 μg/L and decontamination factor reaches 10 000.