首页 | 本学科首页   官方微博 | 高级检索  
     

硅酸盐水泥硬化体中Cr的存在形态分析
引用本文:韦江雄,尧璟云,余其俊,白瑞英.硅酸盐水泥硬化体中Cr的存在形态分析[J].硅酸盐学报,2009,37(7).
作者姓名:韦江雄  尧璟云  余其俊  白瑞英
作者单位:华南理工大学材料科学与工程学院,特种功能材料教育部重点实验室,广州,510640
摘    要:采用改进的BCR(The Community Bureau of Reference)分级浸提方法对硅酸盐水泥硬化体进行分离,并利用离子色谱、紫外-可见分光光度计等测定浸提液中离子浓度,利用X射线衍射和差热分析对浸提剂处理后残渣的组成进行分析,以研究改进的BCR分级浸提方法对硅酸盐水泥硬化体的分离作用以及水泥硬化体中Cr的存在形态与分布.结果表明:所选取的3种浸提剂能够有效地分离水泥水化产物,区分其中不同结合形态的Cr.硅酸盐水泥硬化体中Cr的存在形态可划分为:酸可交换态Cr、可还原态Cr、可氧化态和残渣态Cr,其中,酸可交换态Cr含量低于0.5%;可还原态Cr约占1%,其受环境pH值的影响较大;可氧化态和残渣态为水泥硬化体中Cr的主要存在形态,约为98%.随着龄期的延长,酸可交换态Cr会逐渐向残渣态转换,向环境溶出的可能性减小.

关 键 词:连续浸提方法  形态分析    硅酸盐水泥硬化体

CHEMICAL FORM OF Cr EXISTING IN HARDENED PORTLAND CEMENT
WEI Jiangxiong,YAO Jingyun,YU Qijun,BAI Ruiying.CHEMICAL FORM OF Cr EXISTING IN HARDENED PORTLAND CEMENT[J].Journal of The Chinese Ceramic Society,2009,37(7).
Authors:WEI Jiangxiong  YAO Jingyun  YU Qijun  BAI Ruiying
Affiliation:College of Materials Science and Engineering;South China University of Technology;Key Laboratory of Specially Functional Materials of Ministry of Education;Guangzhou 510640;China
Abstract:The aim of this work is to study the adaptability of BCR (The Community Bureau of Reference) sequential extraction procedures, proposed by the Commission of the European Community Bureau of Reference, to the extraction of hardened Portland cement and the analysits of chemical form and distribution of Cr existing in it. Four solutions and three residues were obtained through three-step extraction tests carried out on hardened Portland cement using the BCR method, and then they were analyzed with ion chromato...
Keywords:sequential extraction procedure  chemical form  chromium  hardened portland cement  
本文献已被 CNKI 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号