零价铁去除堆浸采铀工艺废水中U(Ⅵ)的研究  

Removal of U( Ⅵ) from Leaching Process Wastewater by Zero- Valent Iron

作　　者：曾华[1,2,3] 高柏[2] 赵素芬[2] 张卫民[2] 

机构地区：[1]南昌大学资源环境与化工学院,南昌330031 [2]东华理工大学水资源与环境工程学院,南昌330013 [3]核资源与环境省部共建国家重点实验室培育基地(东华理工大学),南昌330013

出　　处：《工业安全与环保》2015年第11期23-25,36,共4页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(41362011;41162007);江西省科技厅项目(20132BAB203031);江西省科技落地计划项目(KJLD13054);东华理工大学地质资源经济与管理研究中心开放基金(14JC06);东华理工大学校长基金(DHXK201414)

摘　　要：研究了零价铁(Zero-valent iron,ZVI)粉和废铁屑分别去除堆浸采铀工艺废水中以铀酰离子形式(UO2+2)存在的U(Ⅵ),分析了p H值、震荡时间、反应温度、ZVI投加量、共存离子等因素对U(Ⅵ)去除效果的影响。结果表明:在p H=6,震荡时间为80 min,ZVI投加量为1.5 g,铀去除量为0.18 mg/g,ZVI对U(Ⅵ)的去除率可达到98.6%,零价铁粉比废铁屑去除效率略高,共存离子Mg2+,Mn2+,Cl-,NO-3对ZVI去除U(Ⅵ)影响不超过3%,CO2-3和Cu2+影响显著。ZVI去除溶液中U(Ⅵ)以还原沉淀和吸附作用为主,吸附-还原反应遵循一级化学反应动力学方程,探讨出零价铁去除堆浸采铀工艺废水中U(Ⅵ)的机理。The removing effectiveness of U（Ⅵ） in leaching process wastewater by Zero -valent iron （ZVI）（iron powder and waste iron scrap）has been studied .The effects of the dosage of ZVI ,pH ,shaking time and temperature on the removal efficiency are investigated .The results show that：ZVI has very good removal effect on U（Ⅵ） when pH value of solution is 6 ,the dosage of ZVI is 1 .5 g ,the shaking time is 80 min ,the removal rate of U （Ⅵ） and ZVI on U （Ⅵ） can reach 0 .18 mg/g and 98 .6% respectively;the removing efficiency of iron powder is slightly higher than that of waster scrap;the ions Mg2＋ ,Mn2＋ ,Cl- and NO3- have no evident influence on U（Ⅵ） removing rate ,while CO2-3 and Cu2＋ affects obviously . The removal process contains reduction precipitation and sorption ,the adsorption-reduction process follows the pseudo first order reduction kinetics model and the removal mechanism of U（Ⅵ） in leaching process wastewater by ZVI is discussed .

关 键 词：零价铁 废铁屑 U(Ⅵ) 堆浸 

分 类 号：X753[环境科学与工程—环境工程]