ELECTRIC ARC FURNACE Russian patent published in 2002 - IPC

FIELD: electric are furnaces for melting of various metal and nonmetal refractory materials, mainly for production of cement clinker, having a high degree of melt viscosity, may also be used in metallurgy and chemical engineering. SUBSTANCE: the electric arc furnace for melting of various metal and nonmetal refractory materials has a melting chamber enclosed in a body and lined by refractory and a roof with a detachable cover, movable electrode introduced in the roof opening and fastened on a cantilever in the system for its vertical displacement under the fixed electrode, system for feeding the material to be processed with an inlet line to the chamber, and a system of melt evacuation from the chamber. The roof cover is made in the form of a movable gate coupled to a drive providing a reciprocating motion for the gate relative to the roof, the system of electrode vertical displacement is fastened on the gate, the cantilever is provided with a hinge for changing the position of the electrode in the vertical plane, the melt evacuation system is made in the form of a hearth tap-hole in the form of a contraction and diffuser installed one upon the other, the inlet contraction is engageable with the chamber interior, the diffuser - with the furnace body, and the line of the system for feeding the material to be processed is built in the movable gate, the melting chamber is made as a tunnel with a hearth width equal to 2 to 4 D, and the tap-hole for melt evacuation is positioned at a distance of 1 to 2 D from the chamber end wall (where D - the electrode diameter). The second electrode is hinge-joined to the movable gate in the system of vertical displacement, the distance between the first and second electrodes near the lower ends makes up 0 to 5 D, where D is the electrode diameter. The system for feeding the material to be processed is built in the movable gate between the movable electrodes. The fixed electrode is divided in the length of the hearth into a number of rods installed at a distance of 2 to 5 D one from another, where D in the diameter of the movable electrode, and combined outside the furnace body by a common current-conducting bus. EFFECT: enhanced capacity and quality of raw material, reduced power consumption for production of finished product. 5 cl, 3 dwg