Unshaped refractories are refractories that are not calcined. Their development speed is very fast. The output of Japan, the United States and Germany has accounted for more than 1/3 of the total output of refractories. The scope of use has expanded from steel rolling furnaces to steelmaking and smelting. High-temperature kilns such as iron solve the lining problem of some key process equipment.
Definition of unshaped refractory
Unshaped refractory is a refractory that is made up of reasonably formulated granular and powdered materials and binders without forming and firing. Generally, the granular materials that make up this type of material are called aggregates, the powdered materials are called admixtures, and the binders are called cementing agents. This kind of material has no fixed shape, and can be made into slurry, paste and loose, so it is also known as bulk refractory. This kind of refractory can be used to form an integral structure without joints, so it is also called integral refractory.
The basic composition of unshaped refractories is granular and powdered refractories. According to its requirements, it can be made of various materials. In order to combine these refractory materials as a whole, except for a few special cases, the appropriate types and quantities of binders are generally added. In order to improve its plasticity, a small amount of appropriate plasticizer can be added. In order to meet other special requirements, a small amount of hardening accelerator, retarding agent, fluxing agent, shrink-proofing agent and other additives can also be added separately.