Study on the excitation effect and mechanism of coal gasification slag based on solid waste

Abstract

Coal gasification slag (CGS) has pozzolanic activity, and it could be used as a supplementary cementitious material after be activated by some solid waste, which will promote resource utilization of solid waste. In this paper, coal calcium carbide slag and desulfurization gypsum were chosen to activate CGS, the excitation effects were evaluated in different ways and compared with those of salt activators. The microscopic were measured by thermal gravimetry (TG), scanning electron microscopy (SEM) and X-ray diffractometer (XRD) to analyze the excitation mechanism of CGS. The results show that the excitation effects of calcium carbide slag and desulfurization gypsum on CGS are superior to those of salt activators; Through microscopic analysis, the activator promotes the dissolution of glassy state in CGS, accelerates the disaggregation of network structures such as silicon and oxygen, enhancing the activity of CGS. The results of this study can provide references for the excitation of CGS.