When it comes to the difference between corundum and corundum mullite, let us first talk about the properties of the two raw materials, corundum and mullite; the main component of corundum is α-Al2O3, which belongs to the triangular crystal system, and the crystal is short columnar. The density is 3.85~4.01g/cm~3, the hardness is 9, and the melting point is about 2050℃. In addition, corundum itself has high thermal conductivity and insulation, good chemical stability and the ability to resist the action of reducing agents.

　　Therefore, corundum can be used as a raw material for advanced refractories. Mullite is rare in nature. Generally speaking, the raw materials used as refractories are synthetic. Mullite raw material itself has high purity, high density and good structure. It has the advantages of low creep rate, small thermal expansion, good thermal shock resistance, strong chemical corrosion resistance, etc., and has been widely used in the refractory industry.

　　In the construction process of circulating fluidized bed boiler, the main refractory materials are refractory bricks and castables. When castables are used as boiler linings, the two most commonly used are corundum and corundum mullite. So what are the main differences between corundum and corundum mullite?

　　The main difference between corundum and corundum mullite

　　I believe that after understanding the above information, there should be a general idea. Adding corundum to the refractory castable can make the aluminum content of the castable reach more than 90%, and improve the hardness and strength of the castable. However, by adding corundum and mullite to the castable, the aluminum content can reach 99%, the hardness, strength and wear resistance can reach a certain range, and the application effect is also remarkable.

　　However, we need to pay attention that when we use them, we often see corundum wear-resistant castables and corundum-mullite wear-resistant castables. Even if you buy other types of castables, many manufacturers, such as Gongyi Qianjiaxin Material Manufacturers, will add some corundum or mullite raw materials more or less when producing all wear-resistant refractory castables to improve the castables. Hardness and effect construction. Therefore, the castable can play a stronger role and can further save the customer's money.

　　Selection of refractory castables

　　Corundum mullite refractory castable is actually a castable with better performance than corundum refractory castable. For the type of castable used in the boiler, it is still necessary to determine the corresponding refractory material according to the use of the boiler.

　　The corundum contained in the preparation of corundum refractory castables is a trigonal crystal system, and the crystal form is generally short columnar. Corundum itself also has high thermal conductivity and electrical insulation properties, excellent chemical stability and resistance to reducing agents. Therefore, corundum is a medium and high-grade refractory raw material for amorphous refractories. Corundum is generally made of industrial alumina or bauxite after sintering or electrofusion. Therefore, artificial corundum is used in industry. The density and hardness of artificial corundum are relatively large, so the use effect is also relatively significant;

　　The mullite contained in corundum mullite refractory castables is relatively small in nature, and the mullite raw materials used in industry are artificially synthesized, with high purity and high density. , Good structure, low creep rate, small thermal expansion, good thermal shock resistance and strong chemical erosion resistance, are widely used in the refractory industry, and the development is relatively rapid, but if you use corundum and Molai In terms of stone ratio, the hardness and true density of corundum are much better than those of mullite.

　　The difference between corundum and corundum mullite is actually mainly in terms of performance. Corundum refractory castables are mainly wear-resistant and refractory, while corundum mullite refractory castables are mainly thermal shock resistance. The aluminum content of the stone castable is not as high as that of the corundum high-strength castable. However, the flexibility of the corundum mullite castable is better.