Low cement refractory castables refer to castables with CaO content less than 2.5% in calcium aluminate cement refractory castables.Different from the traditional refractory castable, the base of low cement refractory castable is to replace part of calcium aluminate cement with ultrafine powder with the same chemical composition as the main material of the castable, thus the low cement refractory castable has the following properties:
1. The low content of CaO in castable can reduce the formation of low eutectic phase in the material, thus improving the refractoriness, high temperature strength and slag corrosion resistance;
2, the mixing water consumption of castable during construction is only 1/3 -- 1/2 of ordinary castable, so the porosity is low, the volume density is high;
3. After pouring and molding, less cement compounds are generated in curing, and there is no large amount of hydration bond failure during heating and baking, resulting in the decrease of medium temperature strength, but the strength gradually increases with the increase of heat treatment temperature;
4, the strength of the composition of the castable do appropriate adjustment can be prepared into the flow of castable and pump pouring castable.