The difference between low cement castable and traditional castable

Low cement castable and traditional castable is very different, mainly in the difference between the middle and final strength, the traditional castable in the middle strength is not good, but low cement castable is far better than the traditional refractory castable, not only because the cement content is low, and have less calcium content, but also the use of ultrafine powder technology, so that the castable is in a reasonable proportion of particles distribution. Moreover, the final strength and middle strength of castable also are further improved.

Compared with traditional refractory castable, low cement castable has higher density, lower porosity and higher curing strength at room temperature. At the same time, it has good volume stability, the volume shrinks after drying and calcination. The high strength and low cement material in the low cement castable is prepared by using pure calcium aluminate cement as the binder. The maximum use temperature of high strength castable reaches 1600℃, and it has good wear resistance at high temperature. High strength and low cement castables are suitable for use in all kinds of kiln linings with high temperature and strong erosion.

The low cement material with fused white corundum as aggregate is called low cement corundum castable, corundum low cement material has high mechanical strength, erosion resistance and abrasion resistance, the highest use temperature reaches 1700℃, low cement corundum castable is suitable for more than 1400℃, impact abrasion serious large cement kiln mouth, multi-barrel cooling machine elbow and other lining parts used. It is also suitable for use with all parts of the kiln lining above 1400℃.

Traditional refractory castables are made of refractory particles and powders, as well as high aluminum cement. The particle gradation of the aggregate part is not as fine as the low cement material. Cement particles are also coarse, and the proportion of cement added is large, the amount of water added during construction is also large. In addition, the amount of cement is large and the particles are not graded, so that the cement material can not be completely hydrated, especially at 800℃, there is basically no strength, so the performance of traditional castable is not as good as low cement castable.