Low cement refractory castable refers to the combination of calcium aluminate cement refractory castable.Different from the traditional refractory castable, the low-cement refractory castable matrix uses the superfine powder with the same or similar chemical composition of the main material of the castable to replace part or most of the calcium aluminate cement. Therefore, the refractory castable belongs to the mixture of hydration and aggregation.
Because ultrafine powder is used to replace part of calcium aluminate cement, the low content of CaO in low cement castable can reduce the formation of low eutectic phase in the material, thus improving the refractories, high temperature strength and corrosion resistance of slag.
During the construction of low cement refractory castable, the mixing water of castable is only 1/3~1/2 of that of ordinary castable, so the porosity is low and the volume density is high. In addition, after pouring molding, curing generates less cement compounds, and there is no large amount of hydration bond damage during heating and baking.
The low cement castable is used for the whole pouring, which has the characteristics of low porosity, small size of porosity, high density, good volume stability, high strength and small amount of water.In addition, it overcomes the characteristic that the strength of ordinary castable decreases significantly at 800 ~ 1200℃, the use of low cement casting refractory material increases with temperature, so that the thermal shock of the furnace body can be more than doubled.
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