According to the compactness and shape of the product, there are sintering method, casting method and molten spray blowing method. Sintering method is to burn some raw materials into the clinker, crushing and screening, and then a certain proportion of mixed with raw meal, after molding, drying and firing. The aim of raw material pre burning is to burn out the water, organic impurities, sulfate decomposition of the gas, in order to reduce the sintering shrinkage of the products and ensure the accuracy of the product contour dimensions.
Raw materials in the crushing and grinding also need to be screened, because the billet by the different size of the powder gradation, can ensure the most tightly accumulated and obtain dense body. In order to make the ingredients of raw materials and clinker homogenization, to be mixed, at the same time to add a binder to enhance the strength of the billet bond. If the aluminum silicate blank joins the clay, the Magnesia billet joins the sulfite pulp waste liquid, the silica blank joins the lime milk and so on. According to the amount of water content of the billet, can be used to shape (about 5% moisture), plastic molding (about 15% Moisture) and grouting method molding (about 40% moisture). Then dry and burn. Casting method is the raw material after mixing blend fine grinding process, melting at high temperature, direct casting, after cooling crystallization, annealing into products. such as casting mo to stone bricks, corundum bricks and magnesia bricks. Their compact body, high mechanical strength, high temperature structural strength, good slag resistance, the scope of use is constantly expanding. The molten spray method is a method of melting the ingredients into a fiber or hollow ball by spraying it with high-pressure air or superheated steam. Products are mainly used for light fire resistance, thermal insulation.
In addition, can also be made of powdery or granular amorphous refractories, when the tar, asphalt, cement, phosphate, sulfate or chlorinated salts, such as binding agent cementation, not by molding and sintering directly use.