Process for continuous purification of hot metal

Details Process for continuous purification of hot metal Process for continuous purification of hot metal

1986-12-03

1988-05-17

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 58, C21C 702

Patent

active

047448229

ABSTRACT:
A process for the continuous treatment of hot metal as it is running from the blast furnace, in order to enable low phosphorus and sulphur levels to be attained simply and cheaply, so that the metal thus treated is suitable for subsequent use in the convertor for the preparation of steels with a low and very low impurities content. Desulphurizing agent is added to the hot metal flowing in a trough into which it falls from the iron notch of a blast furnace, at a point close to that falling stream of hot metal. The silicon level is measured; and when it exceeds 0.25%, a silicon reduction agent is subsequently added to the hot metal in the trough. Finally, a phosphorus reduction agent is added to the hot metal as it leaves the trough and falls into a receptacle such as a torpedo car. Slag can be skimmed following sulphur and silicon treatments. The order of addition of the silicon reducing agent and sulphur reducing agent can be reversed.

REFERENCES:
patent: 3998625 (1976-12-01), Koros

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