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Phosphate-bonded high-alumina bricks are made of dense special-grade or first-grade high-alumina bauxite clinker as the main raw material, phosphoric acid solution or aluminum phosphate solution as a binder, and are semi-dry pressed and heat-treated at 400~600℃ to form chemically bonded refractory products. Phosphate-bonded high-alumina brick is unfired brick. In order to avoid large shrinkage of the products during high-temperature use, heating expansion raw materials such as kyanite, 규암, pyrophyllite, 규토, 등., are generally required to be introduced into the ingredients. Compared with ceramic-bonded fired high-alumina bricks, they have better spalling resistance, but their load softening temperature is lower, and their corrosion resistance is poor. 그러므로, a small amount of fused corundum, 멀라이트, 등, need to be added to strengthen the matrix. Phosphate-bonded high-alumina bricks are suitable for cement kilns, 전기로 상판, 국자, 등.

Physicochemical indicators of phosphate bonded high alumina brick

안건	RSP-75	RSPA-75	RSPT-1
Al2O3(%) ≥	75	75	80
FeO2(%) ≤	2.1	2.1	1.8
내화성(℃)	1770	1770	1790
부피 밀도(g/cm3) ≥	2.7	2.75	2.9
냉간 분쇄 강도(MPa) ≥	70	75	80
0.2MPaSoftening Temperature Load Degree T0.6 (℃) ≥	1350	1300	1520
열충격 저항(1100℃) Water Quenching (주기) ≥	20	20	15

Characteristics of phosphate bonded high alumina bricks

Alumina bauxite uses high-quality raw materials combined with aluminum dihydrogen phosphate and is finally dried in a drying furnace. It has high refractoriness, good wear resistance, 고강도, 좋은 열충격 저항, so it is very suitable for cement kiln transition zone and cooling zone lining materials. With high load refractoriness temperature, 정확한 크기, 안정적인 성능, this brick has a short construction period and is energy-saving.