Refractory bricks for rotary kiln

Refractoriness: 1580℃

Bulk density: 2.15g/cm³

Cold crushing strength: 25MPa

Brief introduction:

Refractory bricks for rotary kiln is a clay product with Al₂O₃ content of 30% - 40% aluminum silicate material. Clay brick is made of 50% soft clay and 50% hard clay clinker, batching according to certain particle size requirements, after molding, drying, and firing at a high temperature of 1300-1400℃. The mineral composition of clay bricks is mainly kaolinite and 6% a 7% impurities (potassium, sodium, calcium, iron, iron oxide). Clay brick firing process, mainly kaolinite continuous decomposition of water loss to generate mullite crystallization process. Clay brick in the SiO₂ and Al₂O₃ in the firing process and impurities to form eutectic low melting point silicate, surrounded by mullite crystals.

Clay brick belongs to the weak acid refractory products, can resist the erosion of acidic slag and acidic gases, the resistance to alkaline substances is slightly worse. Clay bricks have good thermal properties and are resistant to rapid cooling and heating. Clay brick refractoriness and silicon brick is not similar, up to 1690-1730 ℃, but the load softening temperature is lower than the silicon brick more than 200 ℃. Because the clay brick contains high refractoriness of mullite crystals, but also contains nearly half of the low melting point amorphous glass phase.

In the temperature range of 0-1000 ℃, the volume of clay brick with the temperature and uniform expansion, linear expansion curve is similar to a straight line, linear expansion rate of 0.6% -0.7%, only about half of the silica brick. When the temperature reaches 1200 ℃ and then continue to raise the temperature, its volume will be expanded by the maximum value of contraction. Residual contraction of clay bricks lead to masonry mortar cracking, which is a major disadvantage of clay bricks. When the temperature exceeds 1200 ℃, the low melting point in the clay brick gradually melted, because of the particles by the surface tension and leaning against each other very tightly, resulting in volume contraction.

Characteristics:

Clay bricks have good thermal properties, resistance to rapid cooling and heating, and strong impact resistance, resulting in a long service life, with the ability to resist slag erosion at high temperatures without being destroyed;

Application:

Iron and steel manufacturing industry: industrial blast furnace, hot blast furnace, hot metal ladle, ladle, dip pit furnace, heat treatment furnace, refining furnace, reheating furnace, metal stirring furnace, dome furnace, etc.

Non-ferrous metal industry: smelting furnace, stirring furnace, etc.

Building materials industry: cement kiln, glass kiln, ceramic kiln, lime kiln, kiln car, tunnel kiln, rotary kiln

Energy and incineration: coke ovens, fluidized bed boilers, carbon roasters, incinerators

Physical and chemical indexes of clay refractory bricks

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