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| Study on Remediation Effect of Uranium Contaminated Soil by Chemical Elution |
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Received:June 29, 2019
Revised:July 01, 2019
Accepted:July 03, 2019
Published Online:October 23, 2019
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| DOI：doi：10.3969/j.issn.1007-7545.2019.11.017 |
| KeyWord:radionuclide; uranium contaminated soil; soil particle size; mixture elution |
| Author | Institution |
| Shen Wei |
东华理工大学 水资源与环境工程学院 |
| Gao Bai |
东华理工大学 水资源与环境工程学院 |
| zhangyanhong |
东华理工大学 水资源与环境工程学院 |
| zhanghaiyang |
东华理工大学 水资源与环境工程学院 |
| niutianyang |
东华理工大学 水资源与环境工程学院 |
| yangbing |
中核第四研究设计工程有限公司 |
| LIAN Guo-xi |
中核第四研究设计工程有限公司 |
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| Abstract: |
| Oscillation leaching method was applied to conduct decontamination experiment for three kinds of particle size (+2 mm, -2 mm+0.15 mm, -0.15 mm) of contaminated soils surrounding uranium tailings. The optimum leaching conditions were obtained by single factor test through selection of hydrochloric acid, nitric acid, citric acid, and oxalic acid as eluting agent, and by controlling elution concentration, L/S, time, temperature, and mixture elution. The results show that removal effect of leaching agent on uranium contaminated soil is oxalic acid > hydrochloric acid > nitric acid > citric acid. When leaching concentration is 0.5 mol/L above and leaching time is 8 h above or L/S>10/1, elution effect gradually tends to be stable. Elution effect can be significantly improved by increasing leaching temperature. When two groups of oxalic acid + hydrochloric acid and oxalic acid + nitric acid are selected for elution agent, uranium removal rate in soil with full grain size is 50% above, and total uranium content drop to 27.15 and 24.32 mg/kg respectively, all of which reaches the soil remediation target (40 mg/kg). |
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