Characterization and pozzolanic properties of calcined alum sludge

被引：109

作者：

Tantawy, M. A. ^{[1
]}

机构：

[1] Menia Univ, Dept Chem, Fac Sci, Al Minya, Egypt

来源：

MATERIALS RESEARCH BULLETIN | 2015年 / 61卷

关键词：

Calcined alum sludge; Pozzolanic activity; High temperature hydration; XRD; FTIR; TGA; SEM; WATER-TREATMENT SLUDGE; HYDRATION CHARACTERISTICS; WASTE; ASH; SOIL; SILICA; REUSE;

D O I：

10.1016/j.materresbull.2014.10.042

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Microstructure and pozzolanic properties of water treatment sludge calcined for 3 h at 600-900 degrees C were investigated by XRD, FTIR, SEM, and TGA techniques and Chapelle test. Calcination of alum sludge was accompanied with sequence of chemical reactions including; dehydration of colloidal Al(OH)3, formation of Al2O3, and crystallization of amorphous silica. Calcination conditions greatly affect the microstructure and pozzolanic activity of calcined alum sludge. Under the hydration at high temperature of calcined alum sludge with lime, boehmite (AlOOH), and amorphous silica react with lime forming amorphous calcium aluminate hydrates and calcium silicate hydrates. The amount and density of hydrates increased with calcination temperature up to 800 degrees C then decreased after that. Calcination of alum sludge at 800 degrees C is enough to improve its pozzolanic properties. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：415 / 421

页数：7

共 59 条

[1] Isotherm equilibria of Mn2+ biosorption in drinking water treatment by locally isolated Bacillus species and sewage activated sludge [J].