In industry, both high alumina bricks and phosphate bonded high alumina bricks are commonly used refractory materials for kilns and furnaces in high temperature environments.Fireramo as a manufacturer of refractory bricks, this article will explain the difference between high alumina bricks and phosphate bonded high alumina bricks in order to how to choose the right refractory bricks.
Regular high alumina bricks and phosphate bonded high alumina bricks are both refractory bricks with a high alumina content, but there are significant differences between them.
High-alumina bricks are sintered at high pressure and high temperature. High-alumina bricks have high refractoriness under load, especially the super-high-alumina bricks with more than 80% Al2O3.
Phosphate bonded high alumina brick is a kind of high alumina made by impregnation in phosphoric acid solution and low-temperature roasting, after impregnation with phosphoric acid, the refractoriness under load is increased from 1520℃ to 1570℃. After phosphoric acid impregnation, the porosity is significantly reduced, the bulk density increases, and the flexural strength is greatly improved, and the linear rate of change of phosphate bonded high alumina bricks after phosphoric acid impregnation decreases from +1.67% to +0.495%.
High alumina brick has excellent high temperature resistance and refractory properties due to its high aluminum content. It is able to withstand severe working conditions in high temperature hearths and maintain stable physical and chemical properties.
Phosphate-bonded high alumina bricks form stable phosphate bonds at high temperatures, which greatly enhance their resistance to slag erosion and phosphoric acid attack. This makes phosphate bonded high alumina bricks particularly suitable for use in process environments where phosphoric acid is present.
High alumina bricks perform well in general industrial environments, but may have limited erosion resistance in special process conditions such as those containing corrosive gases or solutions such as phosphoric and sulfuric acids.
Phosphate-bonded high alumina bricks greatly improve their corrosion resistance by adding a phosphate component to form a phosphate bond. This makes phosphate bonded high alumina bricks ideal for handling corrosive gases or solutions.
High-alumina bricks are suitable for various high-temperature kilns and hearths, such as widely used in blast furnaces, hot blast stoves, glass kilns, electric furnace roofs, calcium carbide furnace walls and other high-temperature industrial kilns. It is widely used in industrial production with good market reputation and mature application cases.
Phosphate bonded high alumina brick is a kind of low temperature sintered brick, belongs to chemical bonded high alumina brick, the firing temperature is 500-600°C, the load refractoriness of phosphate bonded high alumina brick is not very high, it is about 1350°C, but the abrasion resistance is very high, phosphate bonded high alumina brick is mostly used in the transition belt, cooling belt, grate, kiln head cover and other parts of rotary kiln.
Fireramo offers high quality high alumina bricks and phosphate bonded high alumina bricks. Our Super Phosphate Bonded High Alumina Bricks can be made from 80% Al2O3 with a linear variation of +0.501%.
Specializing in refractory materials for over 20 years, we provide professional refractory solutions for the global high temperature industry.