Home > Products > Refractory Brick > High Alumina Bricks Series > Phosphate Bonded High Alumina Brick
Phosphate Bonded High Alumina Brick

Phosphate-bonded high-alumina bricks take dense special grade or high-grade bauxite clinker as the main raw material, phosphate solution, or aluminum phosphate solution as a binder. After semi-dry press molding, the green bodies are heat treatment at 400~600 °C. Phosphate bonded high alumina bricks are chemically bonded refractory bricks. It belongs to unburned firebricks. In order to avoid large shrinkage during the application, it is generally necessary to add some thermal expansion materials such as kyanite, sillimanite, silica, and so on.


Phosphate Bonded High Alumina Brick Characteristics

Compared with ceramics bonded high-alumina bricks, phosphate bonded high alumina bricks have better spalling resistance, but refractoriness under load temperature and corrosion resistance of phosphate bonded high alumina bricks are both lower. So some fused corundum or mullite can be added to raw material to improve corrosion resistance and refractoriness under load temperature.

phosphate bonded high alumina brick3Phosphate Bonded High Alumina Bricks Technical Index

Item Phosphate bonded high alumina bricks Alumina phosphate bonded high alumina bricks
Al2O3 % > 76 78
Fe2O3 % < 3.2 3.2
CaO % < 0.6 0.6
Cold crushing strength Mpa > 65 70
Bulk density g/cm3 2.65 2.70
Refractoriness under load ℃ > 1350 1300
Refractoriness ℃ > 1790 1790

Phosphate Bonded High Alumina Bricks Application

Phosphate bonded high alumina bricks adopt 5~10mm bauxite clinker aggregate as main raw material, about 50% phosphate solution as a binder, it has higher porosity, at the same temperature condition, it has a relatively lower modulus of elasticity, as well as better thermals, shock resistance. Phosphate binding high alumina bricks are mainly used for the pre-combustion zone, decomposition zone and kiln door shield of rotary cement kiln, and cooling machine inner linings, where bricks are easy to fall off. Abrasion-resistant high alumina bricks adopt bauxite clinker, less than 5mm as aggregate, aluminum phosphate as a binder, it is more compactly pressed, with high mechanical strength, abrasion resistance, but lower thermal shock resistance. Alumina phosphate bonded high alumina bricks are mainly used at transition zone and sintering zone of middle size and small size dry rotary cement kilns. Phosphate bonded high alumina bricks are also used in electric furnace top, ladles, and so on.

Inquiry:

*
*
Please Choose:
*