Effect of domestic dolomite additives used in the refractory production

Abstract

In this study, the effect of alumina addition on dolomite refractory (extracted from Konya/Turkey) which has been planned to use in refractory industry was investigated. The aim of the study is to increase the brownmillerite phase which aids the sintering process of dolomite. For that purpose, 0.5 wt-% alumina powder (including 99,5 % Al2O3) was added to 3 to 6 mm fraction dolomite, and a sintering operation was carried out at a temperature of 1600, 1650 and 1700 degrees C for 3 different soaking times (2, 4 and 6 h). The resultant phases occured at dolomas (sintered dolomite) were investigated and evaluated by X-Ray diffraction pattern (XRD) and analized by scanning electron microscopy (SEM). It turned out that periclase, lime also portlandite, alite, forsterite, tricalcium aluminate, brownmillerite, merwinite were created. The densities of dolomas were measured. Temperature and increase in time were investigated but convenience in density could not be established.