Phosphate Bonded High Alumina Wear Resistant Brick P

Phosphate-bonded high-alumina wear-resistant brick is a high-performance refractory material with excellent thermal stability, wear resistance and chemical corrosion resistance. (Abbreviated as phosphate brick, brand name P), it uses a 42.5% to 50% phosphoric acid solution as a binder, and the aggregate is alumina clinker calcined in a rotary kiln at above 1600°C. During use, phosphoric acid reacts with the brick surface burnt alumina fine powder and refractory clay, and finally forms a refractory brick with cristobalite aluminum orthophosphate as the main binder.
Its main raw materials include heavy dense high-aluminum aggregate or first-grade bauxite clinker, ‌ using phosphoric acid or aluminum phosphate solution as a binding agent, ‌ pressed by a semi-dry machine, and heated at 400~600℃ Treated to form a chemically bonded refractory article. ‌This kind of brick is a non-fired brick, ‌that is, it will not burn during use at high temperatures. ‌In order to prevent products from shrinking too much at high temperatures, ‌kyanite, ‌sillimanite, ‌pyrophyllite, ‌silica and other heat-expandable raw materials are added to the ingredients. ‌The load softening temperature of phosphate bonded high alumina bricks increases, ‌porosity decreases, ‌volume density increases, and ‌flexural strength increases significantly. The use of ‌phosphate (‌or phosphoric acid)‌ can significantly improve the performance of high alumina bricks. quality, ‌ extend its service life.
This kind of brick is mainly used for calcining cement, bauxite, dolomite and other rotary kilns, the lining of coolers, the working layer of cement vertical kilns, the top of steelmaking electric furnaces and other parts; due to the product's high high temperature strength, good thermal shock resistance, strong wear resistance, easy to hang kiln skin and other characteristics, some cement plants use it in the firing zone and transition zone of small rotary kilns.
Product performance: It has the characteristics of high compressive strength at room temperature, good thermal shock stability, accurate dimensions and high volume density.