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, silimanita, pyrophyllite, sílica, etc., 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. Portanto, a small amount of fused corundum, mulita, etc, need to be added to strengthen the matrix. Phosphate-bonded high-alumina bricks are suitable for cement kilns, Tops de forno elétrico, conchas, etc.

Physicochemical indicators of phosphate bonded high alumina brick

Item	RSP-75	RSPA-75	RSPT-1
Al2O3(%) ≥	75	75	80
FeO2(%) ≤	2.1	2.1	1.8
refratariedade(℃)	1770	1770	1790
Densidade aparente(g/cm3) ≥	2.7	2.75	2.9
Força de esmagamento a frio(MPa) ≥	70	75	80
0.2MPaSoftening Temperature Load Degree T0.6 (℃) ≥	1350	1300	1520
Resistência ao choque térmico(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, força elevada, e boa resistência ao choque térmico, so it is very suitable for cement kiln transition zone and cooling zone lining materials. With high load refractoriness temperature, tamanho preciso, e desempenho estável, 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 de cimento, glass kiln, forno cerâmico, etc.
• Indústria metalúrgica: steelmaking furnace, steel rolling heating furnace, soaking furnace, etc.
• Indústria química: coal gasification furnace, coke oven, calcium carbide furnace, etc.
• Other industries include garbage incinerators, caldeiras, etc.