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Red Mud for Medium Frequency Medium Frequency Furnace Coil Cement. Red mud for medium frequency furnace coil,also known as medium frequency furnace coil cement or coil coating,is a dedicated insulating refractory protective material for medium frequency furnace coils. As a core supporting refractory for medium frequency furnaces, red mud is applied to the outer wall of induction coils to form an insulating and refractory protective layer. It prevents turn-to-turn short circuits and protects thyristors of medium frequency power supplies. Boasting high hot strength, it can temporarily resist erosion in case of molten iron leakage, so as to avoid coil burnout and furnace breakthrough accidents.