The firing temperature of high alumina bricks is very important. If the firing temperature is low, the color will be yellowish white, and the surface appearance will look good, but the use effect will not be as good as if the firing temperature is high.
1. The occurrence of secondary expansion affects the normal use cycle.
High alumina bricks are fired at a high temperature, and the fired color is dark yellow and white. The surface color is not as good-looking as those fired at low temperatures, but the use effect is good, because the temperature of the bauxite raw material itself is also stretchable, and secondary expansion will occur when the temperature is low. phenomenon, affecting the normal use cycle.
2. The sintering temperature depends on the raw material itself
The sintering temperature of high alumina bricks depends on the raw materials themselves. The sintering temperature is determined based on the raw materials. A sintering temperature that is too high will cause the bricks to deform. A sintering temperature that is too low will cause the bricks to have low strength. And it is not wear-resistant and easy to peel off.
Most refractory manufacturers purchase raw materials and then decide on several sets of production processes for trial firing. According to the trial firing conditions, they determine the most reasonable production process plan and reasonable sintering temperature. This will make the produced high alumina refractory bricks have the right temperature. , and the surface color and internal quality maintain the proper use effect.
3. The rotating rotary kiln cannot be used well
If the sintering temperature is slightly lower, the fired high alumina bricks will look good and have consistent dimensions. They can only be used for wall tiles and static furnace linings. If it is a rotating rotary kiln, it cannot be used well because during the rotation process, High alumina firebricks at low temperatures will expand and contract for a second time. When the kiln body expands and contracts at high temperatures, the bricks will expand and expand for a second time, which can easily cause the high alumina fire bricks to peel off.
If high alumina bricks are fired at a suitable temperature, although the color of the fired bricks will be dark, when used in a rotating kiln lining, the effect will be better than the refractory bricks with a good color and a slightly lower temperature, and the service life will be longer. Because when the temperature is high, the raw materials are burned to death and shrinkage will no longer occur, and the use effect will be better.
