Studies On Dolomite Refractories, [III]

Abstract

In the course of the fundamental studies on dolomite refractory, the composition range which have molar ratio of CaO/MgO=1.0, 0.75, and 0.5 was studied in this report.Anti-slaking property were determined by water immersion method at 175°C for 8 hours and were measured by the weight percents of the particles remained on the 6 mesh Tyler's sieve.Test pieces which were made from dolomite, magnesite clinker, pyrite cinder and qualzite, and had molar ratio of CaO/(Fe2O3+Al2O3+SiO2)=1-3, SiO2/(Fe2O3+Al2O3)=1-13, were burned at 1440°C and 1500°C for 1 hour.Dusting, surface luster, crack, and linear shrinkage after these firing were listed in Table 1-3 and shown in Fig. 1. Slaking proerty was listed in Table 4 and Shown in Fig. 2. Refractoriness was shown in Fig. 3. Dusting field and contours of melting point in the special range with respect to corrosion, were measured and shown in Fig. 4.The results of this study showed that the refractories which have the quite good refractoriness of S. K. 37 and stability against the slaking could be obtained in the narrow range on the diagram of molar ratio of CaO/(Fe2O3+Al2O3+SiO2) and SiO2/(Fe2O3+Al2O3). (Cf. This Journal 1950, 58, 46, and 195.)