Ladle refractory castable is made of high-quality high-alumina bauxite, corundum high-quality magnesia as the main materials. It is an unshaped refractory material made of composite micropowder adding some additives. The main features of ladle refractory castables are: good explosion-proof performance, high high temperature strength, strong slag erosion resistance. Different types of ladle castables prepared according to different use conditions are divided into general aluminum-magnesium castables, slag line clad body composite aluminum-magnesium castables, high-grade aluminum-magnesium castables, aluminum-magnesium spinel castables other varieties.
With the requirements of steelmaking plants’ production processes the development of continuous casting out-of-furnace refining, the residence time of molten steel in the ladle is relatively prolonged, thereby accelerating the damage of molten steel to the lining of the ladle, resulting in low ladle service life shorter ladle age. Therefore, high-grade high-strength refractory castables are required. The ladle refractory castable is made of high-purity fused corundum as the main material, mixed with high-purity spinel in the matrix, appropriate amount of binder, admixture (dispersant, water reducing agent), etc. It has good slag resistance stripping resistance, high volume stability, high strength, short sintering time. Effectively improve the age service life of the package, the traditional more than 80 furnaces can be increased to 134 furnaces. To sum up, the country's refractory castables for ladle are also constantly moving forward. The variety of new products is constantly increasing, the quality of products is constantly being deployed, the more effective citation is, it meets the supply demand of the continuous development of the national steelmaking industry. According to the signs of the development of the national steelmaking industry, it is recommended that the development of refractory castables for ladle should be carried out in the following aspects. (1) Develop use refractory castables for ladle with longer furnace age to meet the supply demand of efficient continuous casting refining outside the furnace. (2) Develop low-carbon, non-carbon magnesium-calcium series refractory castables for ladle with better corrosion resistance spalling resistance to meet the supply demand of smelting clean steel, low carbon steel ultra-low carbon steel. (3) Develop energy-saving refractory castables for ladle, such as unshaped refractory castables unburned bricks. (4) Develop resource-saving environment-bearing refractory castables for ladle. (5) Hold a discussion on the reuse of refractory castables for the remaining ladle of various colors.