不同硅铝比电镀污泥烧制陶粒过程中Zn和Pb的挥发特性  

Volatilization Characteristics of Zn and Pb in the Process of Sintering Ceramsite from Electroplating Sludge with Different Si/Al Ratios

作　　者：李晶晶 张敏娜 李媛[2] 唐阵武 LI Jingjing;ZHANG Minna;LI Yuan;TANG Zhenwu(Sinochem Environmental Restoration(Shanghai)Co.Ltd.,Shanghai 200235;School of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029;Beijing Jinyu Mangrove Environmental Protection and Technology Co.Ltd.,Beijing 102402;College of Life and Environmental Sciences,Minzu University of China,Beijing 100081)

机构地区：[1]中化环境修复(上海)有限公司,上海200235 [2]北京化工大学化学工程学院,北京100029 [3]北京金隅红树林环保技术有限责任公司,北京102402 [4]中央民族大学生命与环境科学学院,北京100081

出　　处：《环境卫生工程》2024年第1期28-36,共9页Environmental Sanitation Engineering

基　　金：国家重点研发计划项目(2018YCF1900104)。

摘　　要：为研究电镀污泥陶粒烧制过程中不同工况条件及固体基质组分下Zn和Pb迁移转化规律,以电镀污泥和页岩为原料开展了不同硅铝比生料的烧制陶粒实验,选取烧结温度为700、800、900、1 000、1 150℃,停留时间为8、16、24、32、40 min。结果表明,Zn和Pb的挥发率随着温度升高和反应时间延长而逐渐增大。当烧结温度为1 150℃、停留时间为40 min时,Zn和Pb的挥发率达最大值,挥发率为Pb>Zn。当陶粒原料中硅铝比增大,重金属挥发率减小。动力学分析结果表明,陶粒原料中硅铝比增大,Zn的反应级数和反应活化能均下降,Pb的反应级数和反应活化能均上升。XRD分析结果表明,1 150℃下陶粒中Pb分布较少,可能与Pb氧化物的熔沸点较低有关,而Zn主要以性质较稳定的ZnCr_2O_4和ZnGa_2O_4结构存在于陶粒中,分布量较大。SEM分析进一步表明,陶粒原料中硅铝比增大,导致了高温下陶粒熔融产生的玻璃相物质增多,对重金属挥发的抑制作用增强。In order to study the transfer and transformation of Zn and Pb under different working conditions and solid matrix components during the firing of electroplating sludge ceramsite,the firing experiments of ceramsite with different Si/Al ratios were carried out using electroplating sludge and shale as raw materials.The sintering temperatures was selected as 700,800,900,1000 and 1150℃.The residence time was 8,16,24,32,40 minutes.The results showed that the volatilization rates of Zn and Pb increased gradually with the increased of temperature and reaction time.When the sintering temperature was 1150℃and the residence time was 40 minutes,the volatilization rate of Zn and Pb reached the maximum,and the volatilization rate of Pb was higher than that of Zn.The volatilization rate of heavy metals decreased with the increased of Si/Al ratio in ceramsite.The kinetic analysis results showed that the reaction order and activation energy of Zn decreased and that of Pb increased with the increased of Si/Al ratio.The results of XRD analysis showed that the distribution of Pb in the ceramide at 1150℃was small,which may be related to the low melting boiling point of Pb oxides.While Zn mainly existed in the ceramsite in the structure of ZnCr2O4 and ZnGa2O4 with relatively stable properties,and the distribution of Zn in the ceramsite was large.The SEM analysis further showed that the increased of Si/Al ratio in ceramsite raw materials leaded to the increase of glass-phase substances produced by ceramic melting at high temperature,and the inhibition of heavy metal volatilization was enhanced.

关 键 词：电镀污泥 陶粒 硅铝比 铅 锌 挥发 

分 类 号：X703[环境科学与工程—环境工程]