Analysis of the Formed Protective Layer Inhibiting Alkali Corrosion in Aluminosilicate Refractory Castables

This article analyzes the mechanism of protective layer formation under action alkali in a refractory castable when ground quartz sand (GQS) is used as an admixture to produce conventional castables (CC) and medium cement (MCC). It was found that, independently composition, addition GQS (2.5%) reduces degree K2CO3 dissolution at high temperature, released potassium reacts with silica forms viscous silicate glass, which mobility alkali. The liquid phase formed filled some open pores hindered penetration into deeper layers castable. thickness layer, after three cycles alkaline corrosion test, varies from 700 µm up 1300 µm, depending on composition.