ROOF OF ELECTRIC-ARC MELTING FURNACE Russian patent published in 1995 - IPC

FIELD: metallurgy. SUBSTANCE: roof of electric-arc melting furnace is assembled on a templet from refractory materials so that the masonry of the peripheral circular zone joining a water-cooled roof ring consists of a layer of refractory materials in the form of four circular segments interconnected by four circular sectors forming, together, a peripheral circular zone around a support device where the relation of the total area of refractory roof masonry F in the form of a ball segment to the central zone F₁ ,, F F: F₁= 1,5:1,8 . 1.5:1.8. The peripheral circular zone of the refractory masonry adjoining the water-cooled support ring is made of a refractory material heat-resistant within a temperature interval of 300-700 C, for example, fireclay. To reduce pressure in the central part and thermal expansion of refractories, the fireclay masonry is separated from dinas masonry by a double damping layer of high-refractory silica fabric KC-II-LA 2-3 mm thick over the perimeter of an octagon described around the central part of the roof F₁, the central octahedral zone is made of dinas and the entire refractory masonry of the roof is made in bond. EFFECT: improved design. 2 dwg