某铀尾矿中U、Th在电场作用下释放及迁移规律
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摘要
以电流场作为核素迁移的载体,研究某铀尾矿中U、Th在0、0.5、1.0、1.5V/cm直流电场条件下的释放及迁移规律。结果表明,在添加电场时,铀元素的浸出量小于自然淋滤条件下的浸出量,但土壤对铀的释放能力明显提升,且电场强度越强,释放能力越强,而钍元素则受其影响不大。在0、0.5、1.0、1.5V/cm电场强度条件下铀元素的累积浸出量分别为1.439、1.285、1.474、1.795mg/L,说明电场强度对U的释放以及迁移有促进作用。铀元素在电场作用下的迁移规律和其他重金属元素的规律类似,都是阳极往阴极迁移,且电场强度越大,阳极附近富集的铀元素浓度越高。
With current field as carrier of nuclide migration,release and migration of U and Th in uranium tailings under different DC electric fields of 0,0.5,1.0 and 1.5 V/cm were investigated.The results show that leaching amount of uranium in electric field is lower than that of natural leaching conditions,but uranium release ability from soil under electric field is significantly improved,and the stronger the electric field intensity,the stronger the release ability is,while Th element is not affected.Cumulative leaching amount of uranium element is 1.439,1.285,1.474,and 1.795 mg/L respectively under electric field of 0,0.5,1.0 and 1.5 V/cm,which indicates that electric field promotes release and migration of U.Uranium element moves from anode toward cathode under electric field,which is similar to that of other heavy metal elements.The higher the electric field intensity,the higher the concentration of uranium enriched near the anode is.
With current field as carrier of nuclide migration,release and migration of U and Th in uranium tailings under different DC electric fields of 0,0.5,1.0 and 1.5 V/cm were investigated.The results show that leaching amount of uranium in electric field is lower than that of natural leaching conditions,but uranium release ability from soil under electric field is significantly improved,and the stronger the electric field intensity,the stronger the release ability is,while Th element is not affected.Cumulative leaching amount of uranium element is 1.439,1.285,1.474,and 1.795 mg/L respectively under electric field of 0,0.5,1.0 and 1.5 V/cm,which indicates that electric field promotes release and migration of U.Uranium element moves from anode toward cathode under electric field,which is similar to that of other heavy metal elements.The higher the electric field intensity,the higher the concentration of uranium enriched near the anode is.
引文
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[23]方振东.电动力学修复重金属铜钴复合污染土壤的研究[D].合肥:合肥工业大学,2014.
[2]王慧.重金属污染土壤的电动原位修复技术研究[J].生态环境,2007,16(1):223-227
[3]SILVER M.Water leaching characteristic of uranium tailings from Ontario and Northern Saskatchewan[J]Hydrometallurgy,1985,14(2):189-217
[4]曾文琪.铀尾矿中放射性核素的迁移研究[J].江西化工,2017(5):42-45.
[5]BINAY K DUTTA,SWAPAN KHANRA,DURJOYMALLICK.Leaching of elements from coal fly ash:Assessment of its potential for use in filling abandoned coal mines[J].Fuel,2009,88(7):1314-1323.
[6]ABDELOUAS A.Uranium mill tailings:geochemistry,mineralogy,and environmental impact[J].Elements,2006,2(6):335-341
[7]LANDA E R.Uranium mill tailings:nuclear waste and natural laboratory for geochemical and radioecological investigations[J].Journal of Environmental Radioactivity,2004,77(1):1-27.
[8]曾文淇.南方某铀矿尾矿铀、钍核素在降水淋滤过程中的浸出模拟研究[D].南昌:东华理工大学,2018.
[9]周敏,杜洋.铀尾矿放射性核素迁移研究现状[J].广东化工,2013,40(1):60-62.
[10]周霞,李拥军,赵斌.重金属污染土壤的修复对策[J].广东农业科学,2010,37(12):158-160.
[11]MARY M PAGE,CHRISTOPHER L PAGE.Electroremediation of contaminated soils[J].Journal of Environmental Engineering,2002,128(3):208-219.
[12]RHRS J,LUDWIG G,RAHNER D.Electrochemically induced reactions in soils-a new approach to the insitu remediation of contaminated soils[J].Electrochimica Acta,2002,47(9):1405-1414.
[13]王友东.电动淋洗联合修复铜铅污染土壤的研究[D].北京:中国地质大学,2016.
[14]李文,许虹,王秋舒,等.全球铀矿资源分布以及对中国勘查开发建议[J].中国矿业,2016,25(6):1-6.
[15]石晓亮,钱公望.放射性污染的危害及防护措施[J].工业安全与环保,2004,30(1):6-9.
[16]熊钡,邵友元,易筱筠.外加电场下镍污染土壤离子迁移过程及机理[J].环境科学与技术,2015,38(6):33-38.
[17]周鸣,朱书法.汞污染土壤的电动力学修复试验研究[J].环境污染与防治,2015,37(8):21-25.
[18]朱莉.铀尾矿与土壤中放射性铀、钍及部分重金属的释放迁移规律研究[D].广州:广州大学,2013.
[19]史鸿晋,彭同江,孙红娟,等.模拟降雨对铀尾矿中U、Sr、Mn、Fe释放规律的影响[J].环境化学,2016,35(6):1253-1260.
[20]林增森,杨欣欣.电动力学修复污染土壤的改进技术[J].大学物理试验,2014,27(4):10-13
[21]刘媛媛.放射性核素在不同介质中的迁移规律研究现状及进展[J].有色金属(冶炼部分),2018(6):76-81.
[22]刘又畅.电动力学新技术及其在重金属污染土壤修复中应用研究[D].重庆:重庆大学,2014.
[23]方振东.电动力学修复重金属铜钴复合污染土壤的研究[D].合肥:合肥工业大学,2014.