ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 59, (1) 48 - 58 (2015)


AN EXPERIMENTAL STUDY ON HYDRATION OF VARIOUS MAGNESIA RAW MATERIALS
 
Jastrzebska Ilona, Szczerba Jacek, Prorok Ryszard, Sniezek Edyta
 
AGH University of Science and Technology, Faculty of Materials Science and Engineering, Department of Ceramics and Refractories, al. Mickiewicza 30, 30-059 Kraków, Poland

Keywords: MgO, Mg(OH)₂, Hydration, Refractories, Raw materials
 

Hydration of various commercially available magnesia raw materials were studied under hydrothermal conditions. Raw materials were characterized by XRD, XRF, TG/DTA and SEM/EDS methods. Subsequently, they were subjected to hydration test conducted at temperature of 162°C and presuure of 552 kPa according to ASTM C 554-92 standard. The evolution of phase, microstructure and physicochemical behaviour after hydration test were analysed by XRD, DTA/TG and SEM/EDS. The results showed that presence of the specific secondary phases plays a crucial role in preventing MgO grains against the hydration. Merwinite, monticellite, magnesioferrite and srebrnodolskite were found to constitute protector-like phases that inibit hydration process of magnesia.


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