[China Aluminum Industry Net] pure calcium aluminate cement refractory castable uses calcium aluminate cement as cementing agent, special grade alumina clinker, sintered alumina and fused corundum as refractory aggregates and powders, proportionate The non-fired high-grade refractories are made by mixing with water, mixing, molding and curing. It has the characteristics of high refractoriness and load softening temperature, high compressive strength, good wear resistance, small change after firing, good slag resistance and strong resistance to reducing gas, etc. The higher use temperature is 1800°C. Calcium-acid cement has the characteristics of early strength, block hardness and fire resistance, and is one of the good cementing agents for refractory castables.

The refractory aggregates and powders usually use corundum, mullite, special bauxite clinker and sintered alumina, and chromium slag, chromite, etc. can also be used. Its larger particle size is generally 5mm and in some cases it should be reduced to 3mm. When using special alumina clinker as aggregate, the particle size can be appropriately enlarged to 10mm. In order to achieve a high bulk density of the refractory castable mixture, a reasonable particle size distribution must be selected. In the case of ensuring the compatibility of the refractory castable mix, water consumption should be minimized.

The normal temperature compressive strength is measured after standard curing. 1d compressive strength is about 15.3Mpa, 7d compressive strength is about 41Mpa. Drying compressive strength is higher than 3d at room temperature compressive strength and close to 7d strength. The change rule and formation reason of the compressive strength after burning and high temperature are basically the same as that of low-calcium aluminate cement refractory castables. The difference is that in pure calcium aluminate cements, the alumina content is higher, the impurities are less, the sintering temperature is higher (generally greater than 1300°C), and therefore there is a high fire resistance.

The calcium aluminate cement refractory castable has a small change after firing and has a slight shrinkage below 1000°C, generally about 0.07%. The change after firing at 1500°C does not exceed ±0.08%. Pure calcium aluminate cement refractory castable also has good thermal conductivity and thermal shock stability. The normal temperature thermal conductivity is about 0.31W/(m·K), and the thermal stability is more than 30 times. In addition, the pure calcium aluminate cement refractory castables have excellent wear resistance and slag resistance, and because of their pure composition and low impurity content, they have better resistance to reducing gases.

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