In June, HOT SALES, 14 tons fireclay refractory bricks are packed for delivering to our customer in Korea.
Fireclay refractory bricks are made of 50% soft clay and 50% hard clay clinker according to a certain particle size after mud treatment, molding, drying and baking. The size of ordinary clay brick is 230*114*65(mm), and the size of T-19 clay brick is 4600*225*75(mm). Clay brick belongs to weak acid refractory product, which can resist acid slag and acid gas erosion. Fireclay refractory bricks have good thermal shock performance and are resistant to rapid cooling and rapid heating. Fireclay refractory bricks are widely used in large and medium-sized hot blast stoves, electric furnace insulation layers, blast furnace gas lift pipes and cooling fireplace linings.
In the temperature range of 0-1000℃, the volume of high-quality clay bricks expands uniformly with the increase of temperature. The linear expansion curve is similar to a straight line, and the linear expansion rate is 0.6% to 0.7%, which is only about half of that of silica bricks. When the temperature reaches 1200 ℃ and then continues to heat up, its volume will start to shrink from the expansion value. The residual shrinkage of high-quality clay bricks leads to the loosening of masonry mortar joints, which is a major disadvantage of clay bricks. When the temperature exceeds 1200 °C, the low melting point in the fireclay brick gradually melts, and the particles are closely attached to each other due to the action of surface tension, resulting in volume shrinkage.
Due to the low softening temperature of clay bricks and shrinkage at high temperatures, the thermal conductivity is 15%~20% lower than that of silica bricks, and the mechanical strength is also worse than that of silica bricks. Therefore, clay bricks can only be used in the secondary parts of coke ovens. Such as regenerator sealing walls, small flue lining bricks and regenerator checker bricks, furnace door lining bricks, furnace roof and rising pipe lining bricks, etc
