Ramming material, as the name suggests, ramming material refers to the ramming (manual or mechanical) method of construction, and hardening under heating at higher than normal temperature of the amorphous refractory material. Commonly used as filler for induction furnaces, heating furnaces, heating furnace linings and converter linings, using manual or mechanical tamping methods to construct uncertain refractories.

Since they are all composed of particles and powder-like materials, in order to make it a binder, it should be constructed by strong ramming. Because the ramming material is mainly used for direct contact with the melt, it is required that the grain and powder materials must have high volume stability, densification and corrosion resistance, and the return raw materials used in the induction furnace must have insulation. Tamping materials should be properly selected binder, some do not use binder, some just add a small amount of flux. Acid tamping materials commonly used sodium silicate, ethyl silicate, silica gel and other binders. Among them, the dry ramming material is mainly borate.

Alkaline ramming materials commonly used are magnesium chloride salt and sulfate, etc., and are also used to form carbon bonded organic matter and temporary adhesive when the carbon content is high at high temperatures. Among them, the dry ramming material contains an appropriate amount of iron flux. Type Cr is commonly used as glauberite. Compared with other amorphous refractories of the same material, the ramming material is dry or semi-dry and loose, and a dense structure is obtained by dynamic compaction. The bond has strength only when heated to the sintering temperature. After tamping, it can be hardened and sintered by different heating methods according to the hardening characteristics of the mixture.

If it contains inorganic chemical adhesives, self-hardening up to a certain strength can be removed by mold baking; Contains thermoplastic carbon adhesive, to be cooled after considerable release strength, should be heated quickly before use to coking; It is often not hardened at room temperature after the mold is sintered and tamped. Therefore, the ramming material becomes the lining of the converter... .