Phosphate bonded high alumina brick

Detailed introduction

Phosphate bonded self-alumina brick is made of high-quality bauxite hot material as refractory aggregate, phosphate as binder and admixture. It is molded by 400 tons friction press, baked and fired in tunnel kiln. Its characteristics are strong wear resistance, good thermal shock resistance, non-bursting and non-peeling. This brick is suitable for cement kiln, shaft kiln and other thermal equipment. Its service life is 8-10 months, and it is well received by customers.
Phosphate bonded high-alumina brick is a branch of phosphate bonded high-alumina brick. Phosphate bonded high-alumina brick is a kind of chemically bonded refractory which is made of high-grade or high-alumina clinker as the main raw material and phosphoric acid solution or aluminium phosphate solution as the binder. It belongs to unburned bricks. In order to avoid the shrinkage of products during high temperature use, heating expansion materials, such as kyanite, sillimanite, pyrophyllite, silica and so on, need to be introduced into the ingredients. Compared with ceramic bonded fired high alumina brick, it has better spalling resistance, but its load softening temperature is lower and its corrosion resistance is poor. Therefore, a small amount of fused corundum and mullite should be added to strengthen the matrix. Phosphate bonded high alumina bricks are suitable for cement kilns, electric furnace tops, ladles, etc.


Main Properties


Index

Item

p-1

p-2

pa-1

pa-2

 chenmical composition%

Al2O3 ≥

76

75

78

77

Fe2O3 ≤

2.8

3.0

2.8

3.0

CaO ≤

0.5

0.6

0.5

0.6

C. C.S, MPa ≥

72

65

76

68

bulk densityg/cm³ ≥

2.70

2.65

2.75

2.70

refractoriness under load(0.6%)

1370

1310

1330

1280

refractoriness℃ ≥

1780

1770

1780

1780

 磷酸盐接合高铝质砖



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