الفوسفات المستعبدين طوب الألومينا العالي

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, السيليكا, إلخ., 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. لذلك, a small amount of fused corundum, mullite, إلخ, need to be added to strengthen the matrix. Phosphate-bonded high-alumina bricks are suitable for cement kilns, قمم الفرن الكهربائي, مغارف, إلخ.

Physicochemical indicators of phosphate bonded high alumina brick

غرض	روبيةP-75	روبيةPA-75	روبيةPT-1
Al2O3(%) ≥	75	75	80
FeO2(%) ≤	2.1	2.1	1.8
الحران(℃)	1770	1770	1790
الكثافة الظاهرية(جم/سم3) ≥	2.7	2.75	2.9
قوة التكسير البارد(الآلام والكروب الذهنية) ≥	70	75	80
0.2MPaSoftening Temperature Load Degree T0.6 (℃) ≥	1350	1300	1520
Thermal Shock Resistance(1100℃) Water Quenching (Cycle) ≥	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, مقاومة التآكل جيدة, قوة عالية, and good thermal shock resistance, so it is very suitable for cement kiln transition zone and cooling zone lining materials. With high load refractoriness temperature, الحجم الدقيق, 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: cement kiln, glass kiln, ceramic kiln, إلخ.
• صناعة المعادن: steelmaking furnace, steel rolling heating furnace, soaking furnace, إلخ.
• الصناعة الكيماوية: coal gasification furnace, coke oven, calcium carbide furnace, إلخ.
• Other industries include garbage incinerators, غلايات, إلخ.