Mechanochemical activation of steelmaking slag to obtain a cementless composite binder

Abstract

Objective. One of the promising areas for the use of slag raw materials in the construction industry is to increase its structural instability and activity with the help of mechanochemistry. The article is devoted to the study of the combined activation of the produced (fresh) slag of steelmaking production in order to create an effective technology for obtaining cementless slag binder.Method. Steel slags were used as raw materials - energy-saturated large-tonnage waste of the West Siberian Metallurgical Plant (Novokuznetsk). As an activator waste from the coal industry of the «Abashevskaya» mine (Novokuznetsk): burnt rocks from waste heaps and sludge, obtained by lime neutralization of electrolytes of spent acid batteries, industrial transport batteries. The study of thermogravimetric curves of raw materials: "steel slag" and "burnt rock" before processing showed the characteristic features and their inherent exothermic and endothermic effects. The effect of additives-activators on the physical and chemical processes during the mechanochemical activation of steel-smelting slag has been established and main structure-forming factors.Result. Based on the used mechanically activated slag raw materials, a cementless binder of a matrix structure was obtained.Conclusion. The creation of composite binders using steel-smelting slag is relevant today as part of a large-scale task of construction and technological utilization of technogenic formations.