INDUCTION FURNACE WITH MULTILAYER-LINED STRUCTURE WHERE LOW PERMEABILITY SHAPED MATERIAL IS ARRANGED AT OUTER LAYER OF LINING MATERIAL

PROBLEM TO BE SOLVED: To prevent such a trouble that low boiling point matter such as zinc or the like permeates into the texture within the lining refractory of an induction furnace, and that a molten metal leakage sensor operates, by putting an induction furnace in the two-layer constitution by an outer sleeve where the permeability is at a specified value or under and the vibrating charge work execution layer of dry monolithic material. SOLUTION: An outer sleeve 15 cm.cm/cm .g/cm .sec or under in permeability is installed on the body side of a furnace, and then a dry monolithic refractory is laid at the bottom, and then a former designed at the roughly center of the furnace is arranged, and it is cast in between the outer sleeve and the former, and it is charged with dry monolithic refractory under vibration while giving vibration by tapping it from inside the former. Hereby, the nonconformity by the permeation of zinc can be solved. That is, even if a low boiling matter such as zinc or the like permeates into the texture of the lining material being made by charging it with a dry monolithic refractory under vibration, there is little permeation of zinc by the outer sleeve, where the permeability is mentioned above, constituting the outer layer of the lining material, so it does not end in the abnormal working of a molten metal leakage sensor.