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, Sillimanit, Pyrophyllit, Kieselsäure, usw., 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. Deshalb, a small amount of fused corundum, Mullit, usw, need to be added to strengthen the matrix. Phosphate-bonded high-alumina bricks are suitable for cement kilns, elektrische Ofenoberteile, Schöpfkellen, usw.

Physicochemical indicators of phosphate bonded high alumina brick

Artikel	RsP-75	RsPA-75	RsPT-1
Al2O3(%) ≥	75	75	80
FeO2(%) ≤	2.1	2.1	1.8
Feuerfestigkeit(℃)	1770	1770	1790
Schüttdichte(g/cm3) ≥	2.7	2.75	2.9
Kaltdruckfestigkeit(MPa) ≥	70	75	80
0.2MPaSoftening Temperature Load Degree T0.6 (℃) ≥	1350	1300	1520
Wärmeschockbeständigkeit(1100℃) Water Quenching (Zyklus) ≥	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, Guter Verschleißfestigkeit, hohe Festigkeit, und gute Thermoschockbeständigkeit, so it is very suitable for cement kiln transition zone and cooling zone lining materials. With high load refractoriness temperature, genaue Größe, 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: Zementöfen, glass kiln, Keramikofen, usw.
• Metallurgische Industrie: steelmaking furnace, steel rolling heating furnace, soaking furnace, usw.
• Chemieindustrie: coal gasification furnace, coke oven, calcium carbide furnace, usw.
• Other industries include garbage incinerators, Kessel, usw.