The effect of waste on the formation of cement clinker

Abstract

The article is devoted to the development of resource-saving technology of Portland cement clinker using man-made raw materials. Wastes of skarn-magnetite ores enrichment were used in the experiments. Influence of the man-made component on the processes of clinker formation and composition of clinker phases were studied. Differential thermal and X – ray phase analysis methods were used to study the processes of formation and composition of clinker. It was revealed that the polymineral composition of the waste determines the intensity of low-temperature reactions, the variety of intermediate compounds. The formation of belite proceeds in three stages based on the structures of natural silicates (andradite, grossular, pyroxenes, amphiboles, chlorites, scapolite, epidote and feldspars). The bulk of the belite is formed at a temperature of 1050 – 1150 °C, this contributes to the intensification of the final stage of the formation of alite. Low-base clinker synthesized using ore dressing waste contains active modifications of alite and belite. Low-base cements (KN = 0.77 – 0.87) are characterized by increased strength. Man-made component provision into the raw mix reduces fuel consumption by 7.4 – 21.6 kg / ton of clinker. The research results prove the effectiveness of the use of technogenic materials for the production of cement clinker.