Liquid-cooled lance for blowing oxygen onto a steel bath and met

Details Liquid-cooled lance for blowing oxygen onto a steel bath and met Liquid-cooled lance for blowing oxygen onto a steel bath and met

1985-02-04

1987-02-17

Rutledge, L. Dewayne

Metallurgical apparatus

Means for melting or vaporizing metal or treating liquefied...

By means introducing treating material

75 5923, 2391323, 266270, C21C 532

Patent

active

046434038

ABSTRACT:
A liquid-cooled lance for blowing oxygen onto a bath of molten steel, has a tip (1) with at least one outlet from which a primary supply of oxygen is blown onto the bath, a central duct (2) for the supply of the primary oxygen surrounded by a double tube system (3,4) for supply and removal of cooling fluid, a plurality of secondary outlets (15) disposed around the lance in a conical widening of the lance axially spaced from the tip for blowing a secondary supply of oxygen and a plurality of secondary ducts (8, 9) extending along the lance for supply of the secondary oxygen to the secondary outlets. To obtain a high maximum possible scrap addition, and good control of final oxygen blowing temperature, there are at least eight of the secondary outlets (15) each having a diameter d.sub.s which satisfies the condition d.sub.s /1<0.02 where 1 is the axial distance between the outlets for respectively the primary and secondary oxygen.

REFERENCES:
patent: 2878115 (1959-03-01), Schane, Jr. et al.
patent: 3488044 (1970-01-01), Shepherd
patent: 4427186 (1984-01-01), Buhrmann

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