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When the content of Cao in magnesia brick slurry is high(fused alumina), the function of trapped material is to make Cao fully digested, so as to avoid the cracking of green body caused by hydration of Cao at the early stage of drying and firing. For example, if the refractory castable slurry combined with phosphoric acid is trapped during the initial mixing(glass beads manufacturers), the iron in the material can react fully with phosphoric acid to escape gas.

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Forming refers to the process that the blank is processed into the blank with the help of external force and model(brown fused alumina). The pressed green body has high strength and can be moved without damage. The method uses a brick press and a steel mould to press the mud into a green body(black oxide aluminum). At present, except for a few varieties, the structure shall be uniform and dense, most of refractory products have eliminated the process of trapped materials.

There are many forming methods(brown aluminum oxide). Traditional forming methods can be divided into semi dry method (about 5% of the water content of the blank), plastic method (about 15% of the water content) and grouting method (about 40% of the water content). In the production of refractory products, the forming method is selected according to the properties of billets(garnet abrasive price), the shape, size and technological requirements of products.

Due to the continuous development of refractories industry and the increasing requirements of various industries for refractories(brown aluminium oxide), the forming process is also developing, such as the aluminum carbon products for continuous cast steel are formed by isostatic pressing method; the oversize bricks are formed by ramming method(glass beads supplier); the tubular products are formed by extrusion method; the micro products are formed by hot pressing injection method, etc.

No matter what method is used, the shaped refractory product body shall meet the following requirements(silicon carbide price): shape, size and accuracy shall meet the design requirements; and there shall be no cracks on the surface and inside; it shall have sufficient mechanical strength; it shall meet the expected physical performance requirements(glass bead abrasive). Press forming is the most widely used forming method in refractory production.

Generally, the machine press forming refers to the semi-dry material forming method with moisture content of 4% ~ 9%, which is also called semi-dry forming(green carborundum). The mechanical pressed brick has the advantages of high density, high strength, small drying shrinkage and firing shrinkage, easy to control the size of products, etc.(steel shot abrasive), the surrounding material sinks, so this method plays a major role in the production of refractories.

Generally, it is slightly larger than the critical particle size, and the inclination of the sieve is also considered(silicon carbide companies). When screening raw materials, the selection of mesh size is mainly based on the requirements of critical particle size. In essence, the process of press forming is a process that makes the particles in the blank dense and the air is discharged to form the compact body(white aluminum oxide crystals), and then conduct the second mixing.

According to different discharging ways, it can be divided into overflow type ball mill, lattice type ball mill and side discharging ball mill(arc fused alumina). When the material is unloaded, the intermediate material flows out from the discharge port first, and flows to the middle layer by layer, the complex and heat insulation products are formed by vibration method(46 grit aluminum oxide blast media); and then flows out from the discharge port, resulting in particle segregation.