Molten metal taphole design to improve yield and cleanliness

Details Molten metal taphole design to improve yield and cleanliness Molten metal taphole design to improve yield and cleanliness

1987-02-17

1988-03-29

Rutledge, L. DeWayne

Metallurgical apparatus

Means sealing or opening aperture in vessel

By means plugging aperture

266230, C21C 542

Patent

active

047338539

ABSTRACT:
A taphole structure for BOF vessels that will prevent slag entrapment through vortexing and allow most of the metal to be tapped free of slag. This is accomplished through the use of a refractory member of generally tubular configuration which extends through the sidewall of the BOF vesssel and has a closed end portion extending into the vessel. The sidewall openings are provided in the tubular refractory member closely adjacent its closed end such that the molten metal will not flow directly into the end of the tubular refractory member but rather will flow into the refractory member through the sidewall openings, thereby creating an irrotational flow of metal into the tubular structure in the last stages of tapping without vortexing.

REFERENCES:
patent: 3028642 (1962-04-01), Stauffer
patent: 4368834 (1983-11-01), Daussan et al.
patent: 4431169 (1984-02-01), Fuzii et al.
patent: 4478392 (1984-10-01), Fuzii
patent: 4553743 (1985-11-01), LaBate et al.
patent: 4639927 (1987-01-01), Uno et al.
"Improved BOP/Q-BOP Taphole Design and Tapping Practice", by J. G. Yount, Jr. et al, Iron and Steel Society/AIME, 64th Steelmaking Conference, Ontario, Mar. 1981.
"Vortex Formation During Drainage of Meallurgical Vessels", by P. Hammerschmid et al, Iron and Steelmaking, 1984, vol. 11, No. 6, p. 332.
"The U.S. Steel Refractory Cube Technique to Minimize Tap Slag Carryover", by D. M. Ball et al, Iron and Steel Society/AIME, 66th Steelmaking Conference, Georgie, Apr. 1983, Advertisement for Kurosaki Refractories Co., Ltd. for Slagnon.

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