Method of desulfurizing a ferrous melt

Details Method of desulfurizing a ferrous melt Method of desulfurizing a ferrous melt

1982-04-23

1983-11-15

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 51, 75 52, 75 60, C21C 702

Patent

active

044153589

ABSTRACT:
A melt is contained in a vessel having below the level of the melt an at least gas-pervious wall portion. First the slag is removed, normally by pouring it off, from the melt. Then a finely divided treatment solids suspended in a gas is introduced through the wall portion into the melt. The melt reacts thoroughly with these solids. Immediately deslagging the melt substantially reduces its ability to pick up nitrogen or hydrogen. This can be enhanced by the further step, prior to introduction of the suspension, of adding pure lime to the melt to form a protective layer thereon. The vehicle gas for the powder of course is inert, normally argon. The vessel can also be sealed up with a tight cover after addition of pure lime to it and before introduction of the suspension. Otherwise in the subsequent desulfurizing nitrogen and hydrogen will enter into the metal matrix, especially if there is an appropriate slag present.

REFERENCES:
patent: 3484232 (1969-12-01), Karinthi
patent: 3574596 (1971-04-01), Lohman
patent: 3598383 (1971-08-01), Moore
patent: 3610602 (1971-10-01), Deacon

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