Mineralography and Comprehensive Utilization of Highly Activity Steel Slag

Abstract

The traditional technical constraints made low utilization of the steel slag, which caused a waste of resources and polluted the environment, therefore, new methods are urgently needed to make full use of the waste steel slag. In this paper, quicklime, fly ash and slag were added to steel slag according to the proportioning principle of cement, and then reconstructed by high temperature calcination, finally the steel slag with highly activity was obtained. The study of comprehensive utilization of highly activity steel slag could reduce the accumulation of steel slag and improve the environmental quality. The theoretical contents of minerals in highly activity steel slag were calculated, and the XRD and mineragraphy were performed to analyze the reasons for the increased activity of steel slag. The results showed that there were more tricalcium silicate generated as the improving of calcium-silicate ratio, and there were more liquid phase and calcium aluminoferrite as the improving silica-alumina ratio, the increase of cementitious activity minerals in the steel slag made the cementitious activity improve in the steel slag. Wherein, the crystal defect made the minerals activity improve in the steel slag, and to further improve the cementitious activity of steel slag.