Refractory ramming materials and plastics are amorphous refractory materials widely used before the popularization and application of low cement and ultra-low cement castables. Most of the ramming materials are granular semi-dry materials, and alkaline ramming materials are generally dry dense materials. The ramming method is used to combine the ramming materials. It is characterized by fast construction, can be constructed at a higher temperature, fast drying speed, the distribution of intermediate size particles in the ingredients so that it depends on mechanical external force to achieve the close accumulation of particles.
Refractory ramming material is made of refractory aggregate and clay made of semi-plastic mixture of raw materials and bonding agents, such as high alumina materials, alkaline materials and silicon carbide and spinel materials. Inorganic binders such as clay, phosphoric acid or phosphate, sulfate, chromate and chromic acid, aluminium solution and silica sol and borate and boric acid commonly used in dry ramming. Organic binder such as carboxymethyl cellulose, lignosulfonate, molasses, resins, ethylene glycol, coal tar and asphalt.
The high aluminum ramming material with high aluminum content has the characteristics of high temperature shrinkage and good anti-spalling, etc. It is often used in electric furnace, induction furnace nozzle and ladle in iron and steel and non-ferrous industry.
Al2O3-SiC ramming material has excellent metal liquid permeability resistance, often used in iron and steel metallurgy and non-ferrous (copper smelting, etc.) induction furnace village,
Al2O3-SiC-C ramming material is often used in iron making and electric furnace steel groove and repair lining, among which high graphite content ramming material has good non-wettability, often used in slag line and metal line parts.
Magnesium alkaline dry refractory ramming material is often used for electric furnace bottom and iron alloy coreless induction furnace lining by adding low temperature sinter. In addition, molten magnesium chromium ramming material has good density and strength and erosion resistance at various high temperatures, which is suitable for the use of degassing device in the inner village and very harsh conditions.
Zircon gas hard zirconium density ramming material can also be used in glass kilns. The phosphate-bound high aluminum and aluminum chromium ramming materials have high strength and excellent acid erosion resistance at high temperature and the erosion performance of the neutral slag of fly ash.
The ramming material combined with chromic acid and chromate has the characteristics of high temperature strength, good thermal shock stability and corrosion resistance of each component slag.
Chromic acid and chromate base materials are generally gas and heat rigid combination, widely used, but should be strictly controlled drying and heating process, so as not to inhibit the surface of water vapor discharge lamination, using organic binder carbon ramming material is easy to oxidized at high temperature, so that the strength and slag resistance is reduced. And the use of non-toxic silica gel bonded refractory ramming material containing carbon material at high temperature in the surface of the carbon material into a protective layer, and maintain a high strength.
