What is the role of mid-range magnesia as a refractory material

The mid-range magnesia in the steelmaking production system, including converters, electric furnaces, refining furnaces, ladle, central ladle, etc., has achieved good application effects of refractory materials in electric furnaces, dry oscillation materials: triangular areas, etc.; in converters, Electric furnaces, refractory spray coatings, etc. generally use appropriate repair methods, which are manual repairs. The converter adopts wet spraying, dry spraying or flame spraying, slag splashing protection and other methods. The traditional slag splashing technology is widely used, and the furnace age can reach more than 10,000 times. There are many types of refining furnaces outside the furnace. RH and DH degassing devices pass through the corresponding pipeline lining. High-alumina refractory castables are generally cast as a whole in a large area, and the service life is about 20-80 times. 97 fused magnesia

The iron system includes sintering, coking, blast furnace and its subsidiary equipment. The belt sintering machine ignition furnace selects refractory plastic and clay composite refractory castables produced on site or selects phosphoric acid refractory castable precast blocks for hoisting, with a service life of 3 to 6 years. When the linear ignition device is used, the furnace top pressure is much lower and the furnace working conditions are better. Mid-range magnesia can be lined with lightweight, high-strength refractory castables or refractory fibers and their products with good effects.

Mid-range magnesia promotes sintering: The influence of metal on materials can be attributed to two factors: one is that the introduction of metal-based plastic phase formation can increase the density of the green body, shorten the distance between particles, and reduce the energy required for mass transfer during the sintering process; The freezing point of molten metal is generally lower than that of refractory materials, and a liquid phase can be produced at a lower temperature and liquid composition. The capillary force and its viscous activity accelerate the movement rate of atoms and the reduction of the green body, and promote the densification process of sintering.

Mid-range magnesia plastic forming: the crystal lattice of the metal will move under the force of force, which has plastic characteristics. It is introduced into difficult guesses. Compared with composite inorganic data particles, it plays a role of plastic forming during the forming process, so that the green density prepared under the same forming pressure is higher than that of samples without added metal. Mid-range magnesia improves durability: metals improve the durability of composites through crack bridging, crack deflection and crack blocking mechanisms, of which crack bridging is the most useful toughening mechanism.