Ultra-low cement refractory castable

Ultra-low cement refractory castable coagulation and hardening, mainly condensed together, so the role of ultra-fine powder is very important, is to determine and affect the performance of the key factors. At the same time, the effect of admixture on its performance can not be ignored.
Ultra-low cement refractory castable is developed on the basis of low-cement refractory castables. The amount of aluminate cement is generally 2.5% ~ 5%, the performance is better than low cement refractory castable. Ultra-low cement refractory castable varieties are more widely used.
Ultra-low cement refractory castable preparation principles and strength characteristics, and low cement refractory castable is basically the same, its strength slightly higher.

The traditional ordinary refractory castable cement content of up to 10 to 30%, while the low cement, ultra-low cement matrix with the main material of the castable material or similar micro-silica fume (particle size less than 5um) to replace part or most Cement, while adding a small amount of dispersant (water reducing agent) and a certain amount of slow retarder prepared. The advantages are: 1) the lower content of calcium oxide in the castable material can reduce the eutectic phase in the material, thus improving the refractoriness, high temperature strength and slag resistance; 2) the formation of cement hydrate less , There is no large amount of hydration bond in the heating baking process to reduce the temperature strength of the problem, but with the heat treatment temperature and gradually sintering, the intensity is gradually increased; 3) castable water demand is greatly reduced, so the porosity Low, high density.

Ultra-low cement refractory castables Applications: In the metallurgical, petrochemical, machinery manufacturing, power and building materials and other industrial kiln has been commonly used to replace the traditional castable refractory products for the lining. Vibration type low-cement refractory castable mainly used for post-size lining, such as heating furnace, a variety of heat treatment furnace, electric furnace lid, shaft kiln, rotary kiln, blast furnace hook, the lining of steel ladle and iron ladle.

Low cement castable, ultra low cement castable use temperature than the same material with ordinary refractory castable use of high temperature. Clay and high-alumina low-cement castable can be used for heating furnace, soaking furnace and other heat treatment furnace and rotary kiln lining. Mullite low-grade cement castable can be used for a variety of high-temperature burner lining, heating furnace water-cooled tube wrapped lining and so on. Corundum and chrome corundum low cement castable can be used for some parts of the steel furnace refining device lining, can also be used for induction furnace lining, petrochemical catalytic cracking reactor high temperature wear-resistant lining. Al2O3-SiC-C low-grade cement castable can be used as blast furnace trench, iron furnace out of the trough, hot metal pretreatment with the overall powder spray gun and so on.