METHOD OF METAL MELT TREATMENT AND DEVICE FOR ITS EMBODIMENT Russian patent published in 2001 - IPC

FIELD: ferrous metallurgy, particularly, ladle treatment of liquid metal. SUBSTANCE: method includes production of vacuum in immersion chamber above surface of melt coated with slag in ladle and treatment of melt with inert gas through lances installed in ladle bottom. Formed additionally is contour of circulation of metal volume in immersion chamber and in ladle by supply of inert gas through blowing devices in wall of immersion chamber to part of melt surface in immersion chamber. In the course of metal treatment with inert gas, depth of immersion of chamber into metal melt is regulated in compliance with definite relationship. Flow rate of inert gas through blowing devices in wall of immersion chamber is varies from 0.006-0.014 cu. m/t. h at beginning of degassing up to 0.33-0.51 cu.m/t.h at end of degassing. Flow rate of inert gas through lances installed in ladle bottom is varied from 0.029-0.043 cu.m/t.h at beginning of degassing up to 0.17-0.33 cu. m/t. h at end of degassing. Device for treatment of metal melt has a ladle with lances in its bottom, lined immersion chamber made in the form of cylinder without bottom and connected with vacuum pump and mechanism for moving of immersion chamber. Made in wall of immersion chamber are blowing devices for supply of inert gas to part of metal surface found inside immersion chamber. Blowing devices are located over perimeter of cross-section of immersion chamber over length of arc equalling 0.1-0.75 of length of said perimeter. Lances in ladle bottom are located so that their center in projection of cross-section located from lining of immersion chamber on side of blowing devices at distance equalling 0.1-0.7 radius of immersion chamber. Axis of symmetry of location of lances in ladle bottom coincides with axis of symmetry of location of blowing devices found in walls of immersion chamber. EFFECT: higher efficiency of steel degassing due to more intensive mixing of metal, reduced time of degassing and increased quality of produced metal. 2 cl, 2 dwg, 1 ex