Effects of Activation and Modification on the Microstructure and Composition of Fly Ash
Mande Qiu *
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, People’s Republic of China
Yidan Wang
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, People’s Republic of China
Miao Niu
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, People’s Republic of China
Qingjiao Han
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, People’s Republic of China
Miao Zhang
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, People’s Republic of China
*Author to whom correspondence should be addressed.
Abstract
The fly ash was activated and modified respectively by acid and alkali- soluble method, BET, XRD, SEM and EDS were used to investigate the specific surface area, phase, surface microstructure and the major elements of the original coal fly ash and the modified sample. The results show that the acid or alkali can change the specific surface area, the microstructure and phase composition of fly ash obviously and the activation and modification by the sulfuric acid can improve the surface area significantly. Different modifiers have great effects on the relative content of the major elements in fly ash.
Keywords: Fly ash, activation, modification, microstructure