Monolythic Refractory

Benefits of Monolythic Refractory

Application of Monolithic Refractory

Characteristics of the precast blocks

The prefabricated castable blocks only need to be heat-treated at lower temperatures, which are low carbon and green refractory materials, and are a unique technology in refractory lining technology. It can improve the performance of refractory lining and reduce the consumption of refractory material with stable quality and reliable performance. We know that the purpose of adding steel fiber in castables is to improve the mechanical properties of castables, inhibit the generation of cracks or limit the expansion of cracks when they are formed. The following figure is the steel fiber castables diagram, steel fiber castables prefabricated blocks should be made by a special process. According to the process part and the need to make a certain shape, after demolding according to its working conditions for heat treatment.

Application on Blast Furnace

Blast furnace is an important equipment for ironmaking. Small blast furnace used to use high alumina cement and phosphoric acid high alumina fire-resistant burning material prefabricated block lifting masonry, and now commonly used resin bonded aluminum carbon unburnable brick masonry. Large blast furnace water-cooled wall with SiC castables pounded, the bottom of the furnace bedding and around the brick joints with refractory castables and silicon nitride filler. And its furnace wall with refractory materials, a development trend is the use of castables.

At present, the domestic and foreign used in the blast furnace iron out of the ditch of the unshaped refractories are mainly Al₂-O₃-SiC-C (referred to as ASC) quality, in addition to mullite-SiC-C, Al₂O₃-C, magnesia-aluminum spinel and other types.

Application on ladle

The increase of the steel temperature and the extension of the residence time of the liquid steel in the ladle, so that the refractory materials for the ladle has changed a lot. The ladle was once dominated by shaped refractories, which are now replaced by unshaped refractories. The indeterminate shape of the ladle saves labor, automates construction and drying in the factory, and improves the overall economy. When the side walls of the ladle are indeterminate, its maintenance operation labor hours can save 40%, and when the ladle lining is all indeterminate, the labor-saving effect is 70%. As Al₂O₃-spinel castables have the advantages of good corrosion resistance, small structural spalling, long service life and improvement of steel quality, it has become the main role of the current refractory materials for ladle.

Applications in non-ferrous metallurgy

Aluminum refining reflector furnace is a big consumer of refractories in aluminum plant. The refractory material for the furnace cylinder has changed from brick masonry to the whole structure, and the refractory material in contact with the hot surface metal of the furnace cylinder is usually acid-bonded plastic, phosphate-bonded bricks and low-cemented castables, and the composition of the hot surface refractory material of the lower side wall is usually the same as that of the furnace cylinder, and the heat-insulating material can be used as light-weight heat-insulating castables, heat-insulating clay bricks or ceramic fibers, etc.; The roof material is usually pounding material, burnt material and other high-quality refractory materials; The door of the furnace is usually made of dense castables or lightweight castables, or a mixture of the two can be used for casting.

In electrolytic aluminum refining, non-shaped refractory materials are mainly used in aluminum drums. Aluminum barrels with refractory materials are required to be able to resist the erosion of aluminum water, can withstand the role of rapid cold and heat and good thermal insulation performance. The non-working lining of aluminum ladle generally adopts lightweight castables or lightweight high alumina bricks. If the aluminum liquid in the aluminum drum is to be placed for a long time, heat-insulating castables are usually used to prevent the aluminum liquid from solidifying during transportation. Nowadays, in order to reduce the self-weight of the tank and strengthen the heat preservation effect, the non-working lining adopts alumina hollow ball refractory castables. The working liner is generally used to contain SiO₂ low high-alumina brick masonry, and now some tanks use corundum refractory casting. In the copper refining industry, because CuO as a component of the slag is very aggressive, so the crude refining furnace is widely used in alkaline refractories. Such as reflector furnace, converter, flash furnace and rotary anode furnace parts are used in alkaline magnesium-chromium bricks or MgO-based alkaline tamping material, especially for repairing and replenishing the furnace with. Refining part of the slag and temperature are down, can be used in castables, plastic, spray coating and high alumina bricks and other aluminum silicate refractory materials.