PHYSICOCHEMICAL BASIS OF THERMAL ACTIVATION OF DOLOMITE RAW MATERIAL FROM KARAKALPAKSTAN FOR THE SYNTHESIS OF COMPOSITE BUILDING MATERIALS
Authors
Amina Zhanabayevna Abilova, Rysgul Zhiyemuratovna Bekbosinova, Abat Azatovich Saypov, Zhenis Zhanabayevich Abilov, Bakhtiyar Muratbaevich Ismailov
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This study presents the results of a comprehensive investigation of the physicochemical characteristics, phase composition, and kinetics of thermal activation of natural dolomite from the Jamansay deposit in the Republic of Karakalpakstan. Energy-dispersive X-ray fluorescence spectroscopy (EDXRF), X-ray diffraction (XRD), and Fourier-transform infrared spectroscopy (FTIR) were used to determine the chemical and mineralogical composition of the raw material, which is characterized by a predominance of magnesium–calcium carbonate components and a relatively low content of silicate impurities. Differential thermal and thermogravimetric analysis (DTA-TG) was employed to identify the main stages of thermal decomposition and decarbonization of dolomite. It was established that the most intensive decomposition of the magnesium-bearing component occurs within the temperature range of 730–750 °C, where a reactive magnesia phase, predominantly active MgO, is formed, while the calcium-bearing component is mainly preserved in carbonate form. Scanning electron microscopy (SEM) revealed changes in surface morphology, development of porosity, and structural rearrangement of the material during thermal activation. The obtained results substantiate a rational selective calcination regime and demonstrate the potential of thermally activated dolomite for producing magnesia-based binders, composite, and refractory building materials with controlled properties. The practical significance of the study lies in expanding the raw material base of the construction industry through the utilization of local mineral resources and creating prerequisites for the development of energy-efficient and environmentally safe composite materials.
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Authors
Amina Zhanabayevna Abilova, Rysgul Zhiyemuratovna Bekbosinova, Abat Azatovich Saypov, Zhenis Zhanabayevich Abilov, Bakhtiyar Muratbaevich Ismailov
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