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利用电子探针对水泥净浆中Cr、As、Pb分布特征的研究
引用本文:薛靖川,黄启飞,杨玉飞.利用电子探针对水泥净浆中Cr、As、Pb分布特征的研究[J].环境科学学报,2011,31(4):798-804.
作者姓名:薛靖川  黄启飞  杨玉飞
作者单位:1. 中国环境科学研究院,北京,100012
2. 中国环境科学研究院,北京,100012;北京科技大学土木与环境工程学院,北京,100083;浙江工业大学浙西分校,衢州,324000
基金项目:国家“十一五”科技支撑计划项目
摘    要:通过在模拟水泥窑中高温煅烧含Cr、As、Pb的水泥生料,制取水泥熟料,进而制备水泥净浆片.然后利用电子探针的点、线、面分析,研究了水泥净浆中Cr、As、Pb的整体分布特征及在不同矿物相中的具体分布特征,以揭示Cr、As、Pb在其中的微观物理化学形态,为建立Cr、As、Pb的释放机制提供理论基础.结果表明,Cr在水化硅酸...

关 键 词:水泥窑  电子探针  重金属  分布  形态
收稿时间:7/1/2010 1:56:54 PM
修稿时间:9/6/2010 12:00:00 AM

Distribution of Cr,As and Pb in cement mortar determined by electron probe microanalysis
XUE Jingchuan,HUANG Qifei and YANG Yufei.Distribution of Cr,As and Pb in cement mortar determined by electron probe microanalysis[J].Acta Scientiae Circumstantiae,2011,31(4):798-804.
Authors:XUE Jingchuan  HUANG Qifei and YANG Yufei
Institution:Chinese Research Academy of Environmental Science, Beijing 100012,Chinese Research Academy of Environmental Science, Beijing 100012 and 1. Chinese Research Academy of Environmental Science, Beijing 100012; 2. Civil and Environment Engineering School, University of Science & Technology Beijing, Beijing 100083; 3. Zhejiang University of Technology Zhexi Branch, Quzhou 324000
Abstract:Clinker and cement mortar were produced from raw materials with Cr,As and Pb by simulating the high-temperature calcination in a cement kiln.According to the electron probe microanalysis (EPMA) point,line and surface analysis,the distribution and mineral phases of Cr,As and Pb in cement paste and concrete were identified and the microphysicochemical species of Cr,As and Pb were characterized,thus establishing a theoretical basis to understand the release mechanisms of Cr,As and Pb in cement paste.The results show that:Cr was predominantly enriched in the calcium silicate hydrates,whose content decreases gradually from the center of the gel to the circumference.Other mineral phases,including portlandite crystal and middle phases,with lower content,and some Cr grains with high concentration of Cr exist in the gel.In the cement mortar,only the calcium silicate hydrates contained As,the content in other mineral phases being nearly zero,and the majority of As is likely to form arsenate on the surface of hydration products in the form of physical fixation or sorption.The distribution of Pb in the cement mortar was highly decentralized.Alow level of Pb was present in every hydration product,the calcium silicate hydrates being an exception with a somewhat higher Pb content.Alarge portion of Pb probably forms some compounds with other elements dispersed on the surface of each hydration product.
Keywords:cement kiln  electron probe microanalysis  heavy metal  distribution  speciation
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