High Alumina Refractory Brick The Main Raw Material
High alumina firebrick with fused alumina, sintered alumina, industrial alumina as the main raw material, made refractory refractory products. It has the properties of acid resistance, alkali resistance, strong reduction ability and heat resistance of high alumina firebrick. Long-term use can be used under 1700 ℃. At the beginning of the 20th century, in the early 1960s, China's Beijing refractory materials factory produced 90% to 92% of the refractory products in the foam production of Al203. Since the 1980s, the second largest refractory material in shandong, high alumina refractory material, has been produced by burning materials with more than 90% of the refractory products.
According to the density of refractory materials and the physical and chemical properties of raw materials, the quantity of various materials is determined. Mixing machine or concrete mixer, the feeding sequence of high alumina firebrick is: the binder of high alumina firebrick polystyrene pills and the adhesive of water powder. The shape of the product is easy to grasp, it is easy to produce elasticity after vibration forming and other molding, or use slurry casting to form.
Dry, because of the polystyrene beads in 90 ~ 110 ℃ volume increased, liquefaction, gasification and high aluminum refractory oxide, most manufacturers of polystyrene ball puffed and then used in the production, so the drying temperature should not be too hasty, high aluminum refractory residual moisture requirements after the dry brick is less than 2%. Edge code, install kiln burning with low temperature stage should pay attention to the volume of the object changes, according to the volume of refractory products and physical and chemical indicators to determine the highest firing temperature, generally greater than 1600 ℃, can higher than dense brick firing temperature
High alumina firebrick, namely high alumina firebrick aluminum content of 48 percent or more of silicate refractory material. Made from bauxite or other high aluminum materials, formed and calcined. Thermal stability, high refractoriness is higher than 1770 ℃. Good slag resistance. High alumina brick is the most widely used refractory brick. Therefore, the high price of high alumina bricks directly affects the production cost of enterprises.
One of the important features of high alumina firebrick is the structural strength of the high temperature, which is usually evaluated by the temperature of the softening deformation of the load. The high temperature creep is also measured to reflect its high temperature structure. The results of high alumina firebrick show that as the content of Al2O3 increases, the softening temperature of load increases. High alumina brick manufacturers according to the alumina content is divided into three levels: level Ⅰ alumina content > 75%; The content of i-al2o3 is 60-75%; High alumina firebrick level iii - al2o3 content is 48%-60%, and it is considered that three grades will be divided into three high alumina bricks.