Фосфат связаны с высоким содержанием глинозема

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, силлиманит, пирофиллит, кремнезем, и т. д., 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. Поэтому, a small amount of fused corundum, муллит, и т. д., need to be added to strengthen the matrix. Phosphate-bonded high-alumina bricks are suitable for cement kilns, верхние части электрических печей, ковши, и т. д..

Physicochemical indicators of phosphate bonded high alumina brick

Элемент	RSP-75	RSPA-75	RSPT-1
Al2O3(%) ≥	75	75	80
FeO2(%) ≤	2.1	2.1	1.8
Рефрактерность(℃)	1770	1770	1790
Объемная плотность(г/см3) ≥	2.7	2.75	2.9
Холодная прочность на дробление(МПа) ≥	70	75	80
0.2MPaSoftening Temperature Load Degree T0.6 (℃) ≥	1350	1300	1520
Устойчивость к тепловому удару(1100℃) Water Quenching (Цикл) ≥	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, хорошая износостойкость, высокая прочность, и хорошая устойчивость к термическому удару, so it is very suitable for cement kiln transition zone and cooling zone lining materials. With high load refractoriness temperature, точный размер, и стабильная производительность, this brick has a short construction period and is energy-saving.

Application of phosphate bonded high alumina refractory bricks

• Inorganic non-metallic materials industry: цементная печь, стекольная печь, керамическая печь, и т. д..
• Металлургическая промышленность: steelmaking furnace, steel rolling heating furnace, soaking furnace, и т. д..
• Химическая индустрия: coal gasification furnace, coke oven, calcium carbide furnace, и т. д..
• Other industries include garbage incinerators, котлы, и т. д..