METHOD FOR COMBINED-TYPE BLOW-THROUGH OF MOLTEN METAL IN CONVERTERS Russian patent published in 1998 - IPC

FIELD: ferrous and nonferrous metallurgy. SUBSTANCE: method resides in fact that blow-through of upper layer of metal melt is effected by spatially oriented oxygen jets which axes intersect with horizontal planes extending level with point where jets flow out of oxygen blow lance and also level with conventionally accepted metal melt level in converter. Jet axes pass through points located on circumferences forming symmetrical conical surface to form angle equals to 9-19 deg with vertex at intersection point with surface. The angle defined by axis of any oxygen jet and perpendicular dropped from intersection point of jet axis with symmetrical conical surface onto conventional metal melt surface is equal to 14-20 deg. Relationship between diameters of cross-sections of conical and working surfaces of converter with conventionally accepted metal melt level plane is equal to 0.15-0.30, while relationship between diameters of cross-sections of symmetrical conical surface by planes drawn perpendicularly to converter axis, at level of oxygen jets outflow points and at conventionally accepted metal melt level is equal to 0.03-0.05. It is preferable, that zone where oxygen jets for blow-through of lower metal melt layers intersect with conventionally accepted metal melt plane be placed in zone where jets for upper-level blow-through intersect with the same plane. EFFECT: higher efficiency. 2 cl, 4 dwg