水泥、粉煤灰及其硬化体中Cr(Ⅵ)溶出条件与其影响因素  

LEACHING TEST CONDITIONS FOR Cr(VI) IN CEMENT,FLY ASH AND CEMENT SOLIDIFIED FLY ASH AND THEIR INFLUENCING FACTORS

作　　者：余其俊[1] 白瑞英[1] 曾小星[1] 韦江雄[1] 周春英[1] 

机构地区：[1]华南理工大学材料学院特种功能材料教育部重点实验室,广州510640

出　　处：《硅酸盐学报》2007年第8期1115-1124,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50372021);教育部科学技术研究重点(105139)资助项目

摘　　要：分析了国内外现行的溶出试验方法,研究了不同溶出试验条件对水泥、粉煤灰及其硬化体中Cr(Ⅵ)溶出的影响,探讨了粉煤灰中可溶性Cr(Ⅵ)最大溶出量的测定方法。结果表明:静置时间、温度、液固比、颗粒细度、振荡频率及振荡容器尺寸对水泥和粉煤灰及其硬化体中Cr(Ⅵ)的溶出及测定都具有一定的影响,其中振荡时间和浸提液pH值的影响较为显著。粉煤灰中Cr(Ⅵ)的溶出是一个缓慢连续的过程,其可溶性Cr(Ⅵ)最大含量的测定以多级萃取溶出试验为宜。The leaching test methods adopted in different countries were screened and the effect of various leaching conditions on the leachability of Cr（VI） in cement, fly ashes and hardened fly ash cement specimens were investigated. Also, the maximum leachable Cr（VI） amount in fly ash was determined correspondingly. The test results show that the leaching test conditions, such as placement time, temperature, mass ratio of leachate to solid, fineness, shaking flequency and the size of sample holder, have a great effect on the leaching behavior of Cr（VI） in cement, fly ashes and hardened fly ash cement specimens. Of these conditions, the effect of shaking time and leachate pH is more obvious. Based on the continuous leaching characteristics of Cr（VI） in fly ash specimens, a sequential extraction test method is proposed.

关 键 词：溶出条件 水泥 粉煤灰 六价铬离子 

分 类 号：X75[环境科学与工程—环境工程]