Alumina insulation refractory brick

With fused corundum, sintered alumina and industrial alumina as the main raw material, polystyrene beads to burn out the added material, silica or other materials for volume stabilizer, at room temperature, high temperature are combined, the additive is a binding agent .

Ingredients, mixing and forming

Ingredients based on product bulk density and physical and chemical properties of the request to determine the amount of all kinds of materials added. Mixing with mixer or mud mixer, feeding order is: polystyrene beads → part of the binder and water → powder → binder. Molding using product size easy to grasp, not easy to produce elastic after-effect vibration molding and other forms, or the use of slurry casting.

Dry and burn.

Dry, due to polystyrene spheres in the volume of 90 ~ 110 ℃ surge, then liquefaction, vaporization, oxidation disappeared, most manufacturers of polystyrene pellets for further processing after the expansion, so the drying temperature should not Too high and too harsh, dry brick residual moisture requirements of less than 2%. The kiln uses the side code. During the low temperature stage of firing, the volume change of the lost substance should be noticed. According to the product bulk density and physical and chemical indexes, the maximum firing temperature should be greater than 1600 ℃, which can be faster than the dense brick firing system.

Alumina insulation firebrick body is light, compressive strength, low thermal conductivity, small volume shrinkage of re-burning, good thermal shock resistance, can be used for thermal insulation of high-temperature thermal equipment or the role of the furnace and the flame directly And precision thermal equipment lining work, but not for direct contact with the furnace fluid and slag erosion Department. In a reducing atmosphere also has a higher stability. The use of temperature as the purity of products generally up to 1650 ~ 1800 ℃.