METHOD FOR THE ELECTROMAGNETIC STIRRING OF THE LIQUID METAL IN ELECTRIC ARC FURNACES AND RELATIVE DEVICE

摘要

Method for the electromagnetic stirring of the liquid metal (14) in direct current electric arc furnaces comprising a hearth (35) defined by a floor (13) and by side walls (15), the electric arc furnaces including a central cathode (11) cooperating with anodes (12) arranged on the floor (13) of the furnace and fed by a main current (Io), wherein there is an electromagnetic system generating a magnetic field inside the liquid metal (14) whose vertical (Bz) and radial (Br) components interact respectively with the radial (Jr) and vertical (Jz) components of the overall current present in the liquid metal (14), the method using a first electromagnetic system comprising at least a first winding (19) through which a current (I1) flows and operating from inside the floor (13) and the walls (15) of the hearth (35), and a second electromagnetic system generating a secondary induced current (I3), between adjacent anodes (12), which circulates through the liquid metal (14). Device to achieve the above method and consisting of a first winding (19) through which a current (I1) flows, the first winding (19) comprising a plurality of spirals (20), at least some of the spirals (20) being arranged inside the refractory of the hearth (35) in cooperation with the floor (13) and with at least a vertical segment of the side walls (15).