Refractories in vacuum furnaces
Refractory ramming is made up of refractory aggregate, powder, binder and admixture in proportion. This kind of refractory ramming material is different from refractory plastics. This kind of mixed material is a kind of low-plastic or non-plastic tamping material, which is formed by forced tamping and then hardened by heating, baking or roasting to obtain certain structural strength. Now tamping method construction materials, in addition to plastic (wet tamping) and tamping materials (semi-wet tamping materials), there are dry ramming materials (no liquid ramming materials), is a completely non-plastic ramming materials.
Induction furnace refractory ramming material
The classification of refractory ramming material: according to refractory aggregate, it can be divided into clay, high-alumina, mullite, silicon, magnesium and silicon carbide. According to the type of binding agent and so on. Mix the refractory ramming materials on site with air pick or mechanical ramming, and the air pressure is not less than 0.5mpa. Small amount of material or use of non - important parts, can also be used by hand knotting. Therefore, the inner lining of refractory ramming material, with low moisture content and compact knotting, has better performance than the refractory castable of the same material. The disadvantages of refractory ramming materials are slow construction speed, high labor intensity, and the tendency to be replaced by dry vibration materials and excellent refractory castable. Refractory ramming materials can be used to make induction furnace, heating furnace, furnace lining, as well as converter lining packing, aluminum electrolytic cell. All in all, in addition to the special use materials such as refractory mud, all amorphous refractory materials, as long as the use of water or chemical binders reduced by one-third to one-half, can be used in the ramming method construction, its performance has also improved.
Application of refractory ramming in induction furnace
Refractory ramming is widely used, especially in thermal equipment such as smelting furnace, more applications. For example, in the electric arc furnace, the use of brine magnesia ramming material to tie lining, better results; In the melting groove of industrial frequency induction furnace, the inner lining is tamped with fresh jade to meet the requirements of production process. Aluminum and magnesium refractory ramming materials were prepared on the ladle wall with water glass and other binders, and 200t ladle lining was pounded, with an average life of 85 times, and the single consumption of refractories was low, only 2.7kg/t steel.
A variety of refractory ramming materials containing carbon and silicon carbide are developed, which are applied to the inner lining of the iron hook of blast furnace, and the service life of the lining is improved greatly compared with that of traditional iron hook. In the cross bridge of large hot air cupola furnace, the refractory ramming with zirconium alumina carbon material is used to make the working lining. New materials such as silicon carbide and nitride refractory ramming materials have also been used in blast furnaces. Therefore, the variety of refractory ramming materials has been increased, the application range has been expanded, and the yield has been increased.