What are the refractory materials used in induction furnace

Induction furnace is more commonly used in a melting metal furnace, the current mainly used to melt molten iron, molten steel, copper, aluminum, according to the different melting products, the use of different Medium frequency induction furnace refractory lining materials.
General melting molten iron, the use of quartz sand dry vibration refractory material;
Melting molten steel, using magnesia or alumina material;
Aluminum is made of alumina or clay.
Specific to the furnace, also divided into: coil mud, mouth, mica and insulation layer, dry vibration material layer. General mouth with plastic.

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What are the refractory materials used in induction furnace

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