Peculiarities of protective layer formation in fireclay-based castables during potassium attack
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Peržiūrėti/ Atidaryti
Data
2022Autorius
Malaiškienė, Jurgita
Antonovič, Valentin
Boris, Renata
Stonys, Rimvydas
Zdanevičius, Povilas
Metaduomenys
Rodyti detalų aprašąSantrauka
The potassium released in biomass boilers (used for wood incineration) during fuel burning and penetrates deep into the fireclay-based castable, forming new corrosion compounds (kalsilite, leucite, etc.). The volume of new compounds increases and causes degradation of fireclay-based castables. In addition, the thermal expansion coefficient of altered zones becomes significantly different from that of the original zone in a refractory promoting stress and later degradation of material. However, it was found that dispersive quartz additive retards corrosion process, due to formation of high viscosity amorphous layer.