高炉矿渣细粉对粉煤灰硬化体中Cr(Ⅵ)溶出的抑制  

Retention Effect of Ground Blast-Furnace Slag on the Leaching of Cr(Ⅵ) from Hardened Fly Ashes

作　　者：成立[1] 余其俊[2] 林锦眉 長瀧重義 

机构地区：[1]华南理工大学特种功能材料及其制备新技术教育部重点实验室,广东广州510640 [2]华南理工大学材料学院,广东广州510640 [3]新泻大学工学部建设学科 [4]爱知工业大学工业技术研究所

出　　处：《华南理工大学学报（自然科学版）》2005年第4期73-78,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50372021)

摘　　要：研究了两种高炉矿渣细粉对泥浆型粉煤灰硬化体和干硬击实成型粉煤灰硬化体中Cr(Ⅵ)溶出的抑制效果.结果表明: (1)经适当处理的高炉矿渣细粉能有效抑制粉煤灰硬化体中Cr(Ⅵ)的溶出; (2)溶出抑制的效果与粉煤灰的种类、硬化体制备方法以及矿渣的细度和掺量有关; (3)矿渣细粉与普通硅酸盐水泥复掺时,抑制效果更佳; (4)一般来说,养护龄期延长,硬化体中Cr(Ⅵ)的溶出量减少.同时发现,硬化体中钙矾石和C—S—H凝胶粒子等的生成,对固化稳定Cr(Ⅵ)离子和防止其溶出作用.The retention effects of two kinds of ground blast-furnace slag (GBFS) on the leaching of Cr(Ⅵ) from hardened fly ash slurry and the hardened fly ash compacted at the optimum moisture content were investigated in this paper. The results show that:(1) the leaching of Cr(Ⅵ) from hardened fly ashes can be effectively restrained by GBFS with proper treatment; (2) the retention effect of GBFS on the leaching of Cr(Ⅵ) depends on the types of fly ashes, the preparation method of specimens and the fineness and content of GBFS; (3) better retention effect is achieved when GBFS and OPC (Ordinary Portland Cement) are used together; and (4) generally speaking, the leaching of Cr(Ⅵ) from hardened fly ashes decreases with the prolonging of curing time. It is also indicated that the formation of ettringite and C—S—H gel in hardened fly ashes contributes significantly to the fixation and stabilization of Cr (Ⅵ).

关 键 词：粉煤灰硬化体 六价铬离子 高炉矿渣细粉 溶出 抑制 

分 类 号：TQ172[化学工程—水泥工业]