柠檬酸结合铀酰离子印迹材料循环温和淋洗铀污染土壤

Cyclic Mild Elution of Uranium Contaminated Soil by Citric Acid Combined with Uranyl Ion Imprinting Material

随着铀矿的开采,所带来的矿山周围土壤放射性污染问题对生态环境、人体健康造成严重影响。采用柠檬酸联合铀酰离子印迹淋洗含铀土壤的方法,可以温和高效去除矿山周围土壤中的铀。结果表明,在pH=4淋洗环境中,温和循环淋洗系统对铀的去除率为89.92%,而仅使用柠檬酸淋洗对于铀的去除率为59.6%;相较于单一柠檬酸淋洗,试验达到平衡时间减少了20 h,对于土壤中常规元素的洗出率减少10个百分点。同时,传统化学淋洗方式中,柠檬酸投入量通常约为20~100 g/L,而本试验中,柠檬酸投入量仅为15 g/L,具有高的成本优势。

With the mining of uranium ore,the radioactive contamination of soil around the mine has caused serious impact on the ecological environment and human health.The method of elution uranium containing soil by citric acid combined with uranyl ion imprinting material can gently and efficiently remove uranium from the soil around mines.The results show that in pH=4 elution environment,the removal rate of uranium by mild cycle leaching system is 89.92%,while that by citric acid leaching is only 59.6%.Compared with single citric acid leaching,the time to reach equilibrium is reduced by 20 hours,and the washing rate of conventional elements in the soil is reduced by 10 percentage points.At the same time,in the traditional chemical leaching method,the input of citric acid is usually about 20~100 g/L,while in this experiment,the citric acid input is only 15 g/L,which has a high cost advantage.