High alumina self-flowing refractory castable is a high-strength low-cement castable with the addition of self-flowing agent, explosion-proof agent and a certain amount of mineralizer. There is no need for molding vibration during construction, which can reduce noise, improve the environment, and reduce labor intensity. And it has the characteristics of high strength, good toughness, high refractoriness, good fluidity, strong anti-stripping and wear resistance, and easy construction.
The high alumina self-flowing refractory castable adopts the raw materials of first-grade high alumina bauxite clinker, corundum fine powder, a-A2O3 micropowder, SiO2 micropowder, CA-70, CA-80 cement. The particle size distribution of a-Al2O3 micropowder is less than 1um accounting for 30%~40%, (1~2)um accounting for 40%~50%, more than 2um accounting for 10%~20%: the specific surface area of SO2 micropowder is 17.4m2/m, the average The particle size distribution of corundum fine powder with a particle size of 0.16um is: less than 3um accounts for 8% (3~15um) accounts for 45% (15~30um) accounts for 25%, (30~45um) accounts for 10%, more than 45um accounts for 12% %.
The high alumina self-flowing refractory castable is generally used in the mixing equipment, and the wet mixing time is about 6 minutes. Although the corundum fine powder affects the flow properties of the self-flowing refractory, it can improve the refractory performance of the matrix in the self-flowing castable and can be added appropriately. It is not easy to add too much or too little ultrafine powder in the high-aluminum self-flowing castable. Generally, the addition amount is 7% and 9%. The water reducing agent needs to be added separately, which can improve the flow performance and Mechanical properties, the amount of addition should be controlled within the optimal range.
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