Phosphate bonded high alumina bricks

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, シリマナイト, pyrophyllite, シリカ, 等, 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. したがって, a small amount of fused corundum, ムライト, 等, need to be added to strengthen the matrix. Phosphate-bonded high-alumina bricks are suitable for cement kilns, 電気炉の上部, ひしゃく, 等.

Physicochemical indicators of phosphate bonded high alumina brick

アイテム	RSP-75	RSPA-75	RSPT-1
Al2O3(%) ≥	75	75	80
FeO2(%) ≤	2.1	2.1	1.8
耐火性(℃)	1770	1770	1790
かさ密度(g/cm3) ≥	2.7	2.75	2.9
冷間圧砕強度(MPa) ≥	70	75	80
0.2MPaSoftening Temperature Load Degree T0.6 (℃) ≥	1350	1300	1520
耐熱衝撃性(1100℃) Water Quenching (サイクル) ≥	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, 良好な耐摩耗性, 高強度, 優れた耐熱衝撃性, so it is very suitable for cement kiln transition zone and cooling zone lining materials. With high load refractoriness temperature, 正確なサイズ, 安定したパフォーマンス, this brick has a short construction period and is energy-saving.