1. Drastic changes in temperature cause refractory castables to be damaged too quickly. The thermal shock stability of refractory castables is relatively poor, and severe temperature changes can easily damage them. For example, the cooling zone of the rotary kiln is not only subject to the erosion of clinker, but also constantly receives the effect of secondary high-temperature clinker. The kiln lining material is sometimes buried under high-temperature materials, and sometimes exposed to flames, causing the surface temperature of the lining material to change with the rotation of the kiln, with a temperature difference of more than 200 degrees Celsius. If it is a cold cellar. This temperature change will be more severe, which are factors that cause damage to refractory castables. 2. The falling anchors form pieces of refractory castables. During the use of refractory castables, the falling anchors play a role in tightly sticking to the container wall, maintaining the integrity of the castables and resisting bending of the castables. In the places where the refractory castables fell in pieces, inspection found that many places had fallen off by their roots, leaving only traces of some solder joints. 3