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High-alumina brick is made by incinerating high-alumina sintered bauxite and bonding agent, pelletizing and milling, mixing as per certain ratio, pressing molding and burning under high-temperature. It can be divided into such five grades as LZ-80, LZ-75, LZ-65, LZ-55 and LZ-48 as per physical and chemical indexes. It’s mainly used at high-temperature part of the industrial kiln.
Physical and chemical indexes：
|Al2O3 % ≥||80||75||65||55||48|
|Apparent porosity % ≤||21||24||24||22||22|
|Ambient compression strength Mpa ≥||70||60||50||45||40|
|0.2MPa load softening starting temperature ℃ ≥||1530||1520||1500||1450||1420|
|Changes in heating permanent line %||1500℃×2h -0.4～+0.2||1450℃×2h -0.4～+0.1|