The firing temperature of the high alumina brick depends on the sintering properties of the alumina raw material

The firing temperature of the high alumina brick depends on the sintering properties of the alumina raw material. When the grade and the I grade bauxite clinker (volume density ≥2.80g / cm3), the raw material structure is uniform, the content of impurities is high, so that the green body is easy to sinter, but the firing temperature range is narrow, Undercooled. The use of II bauxite clinker (bulk density ≥ 2.55g / cm3), due to the secondary mullite caused by the expansion and loosening effect, so that the green body is not easy to sintering, so the firing temperature is slightly higher. When the grade III bauxite clinker (volume density ≥2.45g / cm3) is adopted, the structure is dense, the Al2O3 content is low and the firing temperature is low, which is generally slightly higher than 30 ~ 50 ℃ of the firing temperature of clinker clay brick. High alumina bricks are fired in oxidized flame.