Application fields and advantages of refractory castables

 As a new type of refractory material, castable is mainly characterized by high fluidity and is suitable for monolithic refractories formed by casting. Compared with other monolithic refractories, it has higher binder and moisture content and is fluid. Because of its better performance, the application range of unshaped refractories is wider, and the materials and binders used can be selected according to the conditions of use. It can be directly poured into a lining body for use, and can also be used as a prefabricated block by pouring or vibrating method.

Refractory castables are developed on the basis of low cement series refractory castables, and are a type of refractory castables that have developed vigorously in recent years. Its varieties include high-tech, high-performance and high-purity refractory castables, chromium-containing, carbon-containing and micro-expansion refractory castables, etc., which are mainly used in steel smelting furnaces, ladles, tundishes, fluidized bed boilers and regenerative heating furnaces on thermal equipment, the service life is increased and good economic effects are obtained.

Refractory castables use high-quality, high-purity or synthetic refractory raw materials and additives, ultra-fine powder technology, excellent binders and high-efficiency additives. Under the guidance of the basic theory of refractory materials, according to the use and operating conditions of various thermal equipment, scientific formulate the material formula, precisely adjust the particle size composition, reasonably select the binder and admixture, and formulate the new technology refractory castable with excellent performance and longevity. Taking the high-tech refractory castable for ladle as an example, it is characterized by sub-combination, self-sintering, and self-expansion under high-temperature use conditions. The "three-self" principle is also embodied in different degrees in the new technology refractory castables, so its performance is excellent and the service life is significantly improved.

High-quality, high-purity or synthetic refractory raw materials are the basis for the preparation of new-tech refractory castables, and also the basis for the production of high-efficiency unshaped refractory materials. Such as tabular corundum, dense corundum, white corundum, corundum mullite, alumina-magnesia spinel, high-purity magnesia and spherical high-bauxite clinker. In addition, brown corundum, white corundum, sub-white corundum and aluminum-magnesium spinel are made from high-quality bauxite clinker and other raw materials after sintering or electric melting. Process treatment, its performance is excellent, can partially replace alumina-based synthetic materials, and is widely used.

The excellent performance of refractory castable means that its performance indicators are suitable for the use requirements of thermal equipment and can achieve the purpose of longevity. Without the longevity of the kiln, excessive pursuit of performance indicators is of no benefit.

The scope of application of new technology refractory castables is also defined. For example, ultra-fine powder combined with magnesia refractory castable is applied on the ladle slag line, and the effect is better, but as the anti-slag material at the bottom of the heating furnace, because the use temperature is about 1200 ℃, the sintering strength is not reached, and it is difficult to achieve good results. .

Refractory castable is a milestone in the history of the development of unshaped refractories. Its important sign is its entry into the high-temperature smelting furnace of steelmaking and ironmaking, and significant results have been achieved. In the future, according to the use and operating characteristics of the kiln and its thermal equipment, advanced raw materials, scientific formulas, reasonable grading, and elaborate production will be used to develop new high-performance and functional refractory castables to meet the needs of my country’s iron and steel industry. The need for rapid development.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Application fields and advantages of refractory castables
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