How to choose ramming material for melting cast iron in induction furnace?
Cast iron induction furnaces are lined with refractory materials on the furnace wall, and acidic quartz ramming materials are generally used. At present, most foundries use cheap natural quartz induction furnace ramming materials. Although natural quartz will expand sharply due to the crystalline transformation of si during use, the crystalline transformation of quartz is irreversible and will remain when cooled. Therefore, the hot surface of the furnace wall lining is not prone to cracks, and a stable and reliable service life can be obtained. However, due to the large thermal expansion coefficient of si, the thermal shock resistance is poor. It is required that the induction furnace cannot be emptied during use. Continuous operation is ideal. At present, the service life of the domestic furnace wall lining for continuous melting of cast iron with a capacity greater than 10t is 40 to 90 days, and the service life of the furnace wall lining of an induction furnace with a small capacity will be longer.