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有色金属(冶炼部分):2019,(11):81-86
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化学淋洗法对铀污染土壤的修复效果研究
沈威1, 高柏1, 章艳红1, 张海阳1, 牛天洋1, 杨冰2, 连国玺2
(1.东华理工大学 水资源与环境工程学院;2.中核第四研究设计工程有限公司)
Study on Remediation Effect of Uranium Contaminated Soil by Chemical Elution
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投稿时间:2019-06-29    修订日期:2019-07-01
中文摘要: 采用振荡淋洗方法对三种粒径(+2 mm、-2 mm+0.15 mm、-0.15 mm)某尾矿库周边铀污染土壤进行去污试验,选用盐酸、硝酸、柠檬酸、草酸为淋洗剂,通过控制淋洗浓度、液固比、时间、温度、混合淋洗等因素来确定较优的淋洗条件。结果表明:各淋洗剂对铀污染土壤的去污效果为草酸>盐酸>硝酸>柠檬酸;当淋洗浓度大于0.5 mol/L、淋洗时间大于8 h或液固比大于10︰1时,其淋洗效果都逐渐趋于稳定;提高淋洗温度可显著提升淋洗效果;选用草酸+盐酸和草酸+硝酸两组较优混合淋洗组合对全粒径土壤进行淋洗时,土壤中铀去除率均达50%以上,总含铀量分别降至27.15、24.32 mg/kg,均达到土壤修复目标(40 mg/kg)。
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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基金项目:国家自然科学基金资助项目(41162007,41362011);江西省重点研发计划项目(20181ACG70023);河北省重点研发计划项目(18274216D)
引用文本:
沈威,高柏,章艳红,张海阳,牛天洋,杨冰,连国玺.化学淋洗法对铀污染土壤的修复效果研究[J].有色金属(冶炼部分),2019(11):81-86.
Shen Wei,Gao Bai,zhangyanhong,zhanghaiyang,niutianyang,yangbing,LIAN Guo-xi.Study on Remediation Effect of Uranium Contaminated Soil by Chemical Elution[J].Nonferrous Metals (Extractive Metallurgy),2019(11):81-86.

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