(1) Thermal expansion: Kyanite minerals are converted into a mixture of mullite and kyanite during heating. During this transformation, the minerals expand with volume and form a good ashhole needle network, which expands in volume. The rate is 16-18%. (2) Stability: The stability of refractory materials produced by kyanite minerals is 1.5 times higher than that of clay refractories. Kyanite refractory bricks have a 43% lower loss than clay bricks and 150-200 furnaces longer than clay bricks. (3) High refractoriness: the general clay-like refractory has a refractoriness of 1670-1770 ° C, while the kyanite refractory material is usually greater than 1790 ° C and the highest is greater than 1850 ° C. (4) Irreversibility: Calcination of kyanite minerals into mullite is an irreversible transformation. It is stable below 1810 °C. Therefore, the mullite refractory material has the characteristics of stable volume at high temperature, low expansion ratio, strong chemical corrosion resistance, high mechanical strength and strong thermal shock resistance.
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