Low cement castable

The low cement refractory castable refers to the refractory castable combined with calcium aluminate cement. The castable with CaO content less than 2.5%, that is, the calcium aluminate cement is added in an amount of about 1/2-1 of the ordinary calcium aluminate cement castable. /3 castables, the traditional refractory castables are different: the low cement refractory castable matrix is replaced by a superfine powder with the same or similar chemical composition of the main material of the castable to replace some or most of the calcium aluminate. Cement, so such castables belong to a castable that is shared by hydration bonding and agglomeration. Since the partial calcium aluminate cement is replaced by ultrafine powder (fine powder), the low cement refractory castable has the following advantages:

1. The Cao content in the castable is low, which can reduce the formation of low eutectic phase in the material, thereby improving the refractoriness, high temperature strength and resistance to slag erosion;

2. The water consumption of the castables during construction is only 1/3-1/2 of the ordinary castables, so the porosity is low and the bulk density is high;

3. After casting, there is less cementing in the curing, and there is no large amount of hydration bond breaking during heating and baking, which causes the medium temperature strength to decrease, but the strength increases with the increase of the heat treatment temperature;

4. The strength composition of the castables can be formulated into self-flowing castables and pumping castables by making appropriate adjustments.