RESEARCH OF SILICATE SYSTEMS WITH TECHNOGENIC RAW MATERIALS FOR CEMENT PRODUCTION
DOI:
https://doi.org/10.35546/kntu2078-4481.2025.3.1.10Keywords:
cement, rice husk, fly ash, raw material mixture, crystalline phases, propertiesAbstract
Cement production is characterized by high resource intensity and is based on the use of natural raw materials, the deposits of which are exhaustible and non-renewable. This makes the problem of replacing natural raw materials with waste from other industries as man-made raw materials relevant. Silicate systems for the production of cement based on compositions of various natural and man-made raw materials were investigated. As man-made raw materials, high-tonnage waste from the agricultural industry – rice husk and from the heat and power industry – fly ash were used. The work comprehensively used methods of physicochemical analysis of silicates and standardized technological testing of the properties of the binder material: Calculations of the composition of raw material mixtures were carried out using the computer program “RomanCem”. The peculiarities of the chemical and mineralogical composition of rice husk as a source of amorphous silica with increased reactivity and fly ash with an increased content of iron oxides and a developed glass phase are noted. Calculations of the possible concentration of the specified technogenic raw materials in raw material mixtures at given values of the hydraulic and silica moduli of cement were carried out.Based on the analysis of computer calculations, new compositions of the initial raw material mixtures were determined based on the systems limestone-kaolin-rice husk and limestone-rice husk-fly ash with a content of 20.0 to 48.5 wt.% of components of technogenic origin. The features of the phase composition of cement from raw material mixtures based on the studied silicate systems during firing at a maximum temperature of 1100 °C and the possibility of regulating the properties of the mineral binder by varying the developed compositions of the initial mixtures are shown. It is concluded that the assessment of the possibility and degree of effectiveness of using individual varieties of technogenic raw materials as a component of silicate systems should take into account the peculiarities of their aggregate state, chemical and mineralogical composition, and reactivity in the processes of physicochemical transformations in technological cycles. At the same time, scientifically based use of industrial waste makes it possible to comprehensively solve the problems of resource conservation and chemical technology of silicates.
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