alumina castables, also known as non-vibration castables, not only have similar performance to low-cement and ultra-low-cement castables, but also flow and degas without external force due to their rheological characteristics. , Compared with castables, it has the characteristics of self-flow, self-leveling, smooth surface of construction body, pumpability, short construction time, no noise and low labor intensity, especially suitable for pumping construction and use in thin layers and multi-arch places Therefore, in recent years, it has been paid more and more attention at home and abroad and the scope of use has been continuously promoted. in the cement industry. In the metallurgical industry and non-ferrous metallurgical industry, such as the permanent lining of the tundish, the part below the bottom surface of high alumina, the lining of the secondary smelting CAS-OB movable fume hood, the trough-type induction insulation layer for cast iron, the lining of civil incinerators, etc. The effect is very good.
 
At present, the raw materials generally used in domestic self-flowing castables are dense corundum, tabular corundum, etc., which have high cost and limited application fields. This technology started not long ago in China. In order to promote the new technology of self-flowing castables and reduce production costs. Using high alumina bauxite as the main raw material, the effects of various factors on the artesian value and mechanical properties were studied.
 
The raw materials of alumina castables are local first-grade high alumina bauxite clinker, corundum fine powder, a-AL2O3 micropowder, SiO2 micropowder, CA-70, CA-80 cement. The particle size distribution of a—AL2O3 micropowder is less than 1μm accounting for 30%~40%, (1~2)μm accounting for 40%~50%, greater than 2μm accounting for 10%~20%: the specific surface area of SiO2 micropowder is 17.4㎡/m, the average The particle size distribution of corundum fine powder with a particle size of 0.16μm is: less than 3μm accounts for 8% (3 ~ 15) μm accounts for 45% (15 ~ 30) μm accounts for 25%, (30 ~ 45) μm accounts for 10%, more than 45 μm accounts for 10% 12%.