Self-flowing refractory castables are used in narrow parts of the kiln lining, or when repairing damage to various kilns. Self-flowing castables are characterized by high-temperature and hot self-flow pouring.
Self-flowing refractory castable material is a kind of refractory castable that has fluidity, filling property and stability, and can rely on self-flow to form a dense lining. In general, the self-flow rate of self-flowing material is controlled between 50% and 100%. If the self-flow value is too small, the material fluidity is poor, and the castable cannot fill the model during construction, forming a dense lining. If the self-flow value is too large, materials may segregate during construction.
Application of Self-flowing Refractory Castable in Kiln Repair
Due to the characteristics of the self-flowing refractory castable, it is convenient to be used for repairing the furnace. In most impressions, the maximum particle size of the self-flowing castable is 5mm. Because this facilitates the flow of the castable. Different types of refractory aggregates used in self-flowing refractory castables have different degrees of self-flowing. It is also based on different temperatures to determine the different materials used for self-flowing castables.
White corundum, brown corundum, alumina-based corundum and high alumina are used as refractory aggregates. When the proportion of various materials and the proportion of water are the same, the self-flow rate of the castable is different. Because the bulk density of the raw materials of self-flowing refractory castables is large, the water absorption rate is low and the impurities are few are the biggest factors of fluidity.
Factors Affecting the Quality of Self-flowing Castables
1. Reasonable aggregate particles and aggregate gradation. Refractory aggregates generally use spherical, low water absorption raw materials, with a particle size of 5-8mm. The ratio of aggregate to powder is 6:4, and the ratio of coarse, medium and fine aggregate is 20:45:30.
2. Suitable binding agent and water reducing agent. Choose reasonable binding agent and water reducing agent.
3. Proper water consumption. Strictly control the water consumption, too much water can reduce viscosity and improve fluidity.
For self-flowing refractory castables, the selection of critical particle size is very important. However, in recent years, with the continuous improvement and research of castable manufacturers, the addition of large particles in the particles has increased the strength of the self-flowing castable. Moreover, the castable flows uniformly and does not sink, which makes the self-flowing castable have a longer service life in repairing the furnace lining. Learn more about the refractory castables for the kiln lining, https://refractorycastablecement.com/.