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, sillimanite, pyrophyllite, silice, eccetera., 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. Perciò, a small amount of fused corundum, mullite, eccetera, need to be added to strengthen the matrix. Phosphate-bonded high-alumina bricks are suitable for cement kilns, piani di forni elettrici, mestoli, eccetera.

Physicochemical indicators of phosphate bonded high alumina brick

Articolo	RSP-75	RSPA-75	RSPT-1
Al2O3(%) ≥	75	75	80
FeO2(%) ≤	2.1	2.1	1.8
Refrattarietà(℃)	1770	1770	1790
Densità apparente(g/cm3) ≥	2.7	2.75	2.9
Forza di frantumazione a freddo(MPa) ≥	70	75	80
0.2MPaSoftening Temperature Load Degree T0.6 (℃) ≥	1350	1300	1520
Resistenza allo shock termico(1100℃) Water Quenching (Ciclo) ≥	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, molta forza, e buona resistenza agli shock termici, so it is very suitable for cement kiln transition zone and cooling zone lining materials. With high load refractoriness temperature, dimensione precisa, and stable performance, this brick has a short construction period and is energy-saving.

Application of phosphate bonded high alumina refractory bricks

• Inorganic non-metallic materials industry: forno di cemento, forno per vetro, ceramic kiln, eccetera.
• Industria metallurgica: steelmaking furnace, steel rolling heating furnace, soaking furnace, eccetera.
• Industria chimica: coal gasification furnace, coke oven, calcium carbide furnace, eccetera.
• Other industries include garbage incinerators, caldaie, eccetera.