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High aluminum hook brick

High aluminum hook brick

Product advantages: low temperature creep, strong corrosion resistance, good thermal shock stability

product description

High-aluminum hook bricks with alumina content above 48% are neutral refractory materials. It is formed and calcined from bauxite or other raw materials with high alumina content. High-aluminum hook bricks have high thermal stability, and their refractoriness is above 1770℃. The slag resistance is better.

The production process of high alumina bricks and multi-clinker clay bricks are similar. The difference is that the proportion of clinker in the ingredients is higher, which can be as high as 90-95%. The clinker needs to be sorted and sieved to remove iron before crushing, and the firing temperature Higher, such as Ⅰ, Ⅱ high alumina bricks are generally 1500~1600℃ when they are fired in a tunnel kiln.

Physical and chemical indicators

Rank/Index High alumina brick Secondary high alumina brick Three-level high alumina brick Super high alumina brick
LZ-75 LZ-65 LZ-55 LZ-80
AL203 ≧ 75 65 55 80
Fe203% < 2.5 2.5 2.6 2.0
Bulk density g/cm2 2.5 2.4 2.2 2.7
Compressive strength at room temperature MPa> 70 60 50 80
Load softening temperature °C 1520 1480 1420 1530
Refractoriness °C> 1790 1770 1770 1790
Apparent porosity% < 24 24 26 22
Heating permanent line change rate% -0.3 -0.4 -0.4 -0.2