2种浸取程序下炉渣重金属浸出特性  

Heavy metal leaching characteristics of slag under two leaching procedures

作　　者：吴丽萍[1] 苟楚璇 李庆波[1] 文科军[1] 张玉瑶[1] 冉帆[1] 

机构地区：[1]天津城建大学环境与市政工程学院,天津市水质科学与技术重点实验室,天津300384

出　　处：《环境工程学报》2016年第3期1418-1425,共8页Chinese Journal of Environmental Engineering

基　　金：天津市自然科学基金项目(15JCZDJC40100);国家科技支撑计划项目(2009BAC55B03-1);天津市科技支撑计划项目(12ZCGYSF01900);天津市科技计划项目(13ZXCXSF12000)

摘　　要：对锅炉煤渣、高炉煤渣、流化床焚烧渣和炉排焚烧渣4种炉渣样品进行了分级,研究炉渣典型重金属（Cu、Zn、Cr、Cd、Pb）含量,以及基于水平振荡浸出程序（HVEP）和毒性特性浸出程序（TCLP）浸取程序的重金属浸出特性,为炉渣的资源化利用模式提供科学依据。结果表明,2种浸取程序下,4种炉渣的重金属浸出浓度远低于浸出毒性限值,其中,炉排焚烧渣中典型重金属（Cu、Zn、Pb、Cr、Cd）浸出量最大,高炉煤渣最小;HVEP方法下,〈2 mm粒级炉渣对重金属浸出总量的贡献较大,TCLP方法下则为2-6 mm粒径段;高炉煤渣和流化床焚烧渣可作为基质应用于潜流园林湿地污水处理系统,但不适宜于酸雨区。Bottom-ash samples of slag from coal-fired boilers,blast furnaces,fluidized-bed incinerators,and grate incinerators were classified by size. The typical heavy metals（ Cu,Zn,Cr,Cd,Pb） present,and their leaching characteristics,in relation to the particle-size-class fractions,were studied based on the horizontal vibration extraction procedure（ HVEP） and toxicity characteristic leaching procedure（ TCLP）,which would provide reliable data for slag-resource-utilization methods. The results indicated that the leaching concentration was considerably lower than the toxicity limited standard for HVEP and TCLP,wherein the typical heavy-metal leaching amount of grate incinerator slag is maximum,but that of blast furnace slag is minimum. Slag in fractions of 〈0. 9 mm particle size greatly contributed to the amount of heavy metals leaching under the HVEP procedure.The leaching concentrations increased in fractions from 2 to 6 mm particle size under the TCLP procedure. The slag from blast furnaces and fluidized-bed incinerators could be applied to subsurface-flow gardens or constructed wetlands as filler or substrates,but would not be suitable for areas with acid rain.

关 键 词：炉渣 重金属 浸取程序 浸出特性 

分 类 号：X705[环境科学与工程—环境工程]