Refractory ramming material and its characteristics

Refractory ramming material is bonded granular material consists of very high proportion and the proportion of very low and other ingredients, even all the grain, powder material, to the strong pound bulk material to fight the way construction.

Because the ramming material is mainly used for direct contact with the melt, the grain, powder material must have high volume stability, compactness and erosion resistance, used for induction furnace should also be provided with insulation.

Bonded ramming choice should be appropriate, some without bond, some only add a small amount of flux. Acidic castable material commonly used sodium silicate, ethyl silicate, silica gel bonded, the dry ramming material with borate; alkaline ramming material used magnesium chloride and sulfate; often use carbon containing higher at high temperature can be formed with organic carbon and temporary binder. The dry ramming material and fluxing agent amount of iron. Chrome ramming material used to mount pin.

Other unshaped refractory materials compared with similar material ramming material, a dry or semi dry loose,

rely on the strong ramming to obtain compact structure, only the heating to the sintering temperature, the combination will have the strength. Castable refractory after forming, according to the characteristics of mixed hardening, adopt different heating methods to promote the hardening or sintering.

Such as containing inorganic chemical bond, self hardening reached a considerable strength after baking mould; containing thermoplastic carbon mixture, after cooling has considerable strength and release, before use should be rapidly heated and coking; without bond hardening at room temperature, often with a model for sintering in the ramming.