Abstract
This is a report on an investigation about the chemical composition, mineralogical structure and physical properties of the stabilized dolomite clinkers which are to be used as basic refractories. SiO2, Fe2O3, Al2O3 are added to dolomite ore as stabilizers and burnt at 1520°C. These materials are analysed by a chemical and mineralogical method. These stable clinkers consist of periclase and tricalcium silicate, and a dicalcium ferrite is produced with some amount of Fe2O3, Al2O3 also produces tricalcium aluminate. Both dicalcium ferrite and tricalcium aluminate have a low melting point and accelerate sintering properties. In consequence of this effect, apparent porosity decreases and compressive strength at room temperature increases. As the compressive strength extremely decreases above 1200°C, they are not suited for refractories. Material 5-9, 12 in Table 4 have excellent properties and suited for long storage. We suppose this effect is caused by existing tricalcium silicate and periclase.
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