Direct steelmaking process from 100% solid charge of multiple re

Details Direct steelmaking process from 100% solid charge of multiple re Direct steelmaking process from 100% solid charge of multiple re

1989-05-10

1990-09-18

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75532, 75958, C21B 1100

Patent

active

049575465

ABSTRACT:
The present invention relates to a new steelmaking process and apparatus which operates on an intermittent basis where several cycles composed of reducing and oxidizing periods are performed to create sufficient energy for melting of solid metallic charge, i.e., sponge iron, scrap, iron ore. During the reducing period, oxygen and carbonaceous material are injected through the vessel bottom thus attaining both carburization of a steam of the melt and generation of CO+H.sub.2 rich gas, and when the dissolved carbon of the melt is in the range of 3%-4%, conditions are then changed to the oxidizing period where solid metallic charge is added initially while oxygen injection is maintained, and until the solid charge has been melted, thus generating a stream of CO+CO.sub.2 gas rich in CO. In addition, other fluids and solids participate in the process, i.e., nitrogen, hydrocarbons, fluxes, and are used according to the appropriate period of the process. After several cycles have been performed, molten metal, preferably raw steel, is transferred to a ladle for further processing and an ignition molten metal heel remains in the vessel for initiation of the next heat.

REFERENCES:
patent: 4198230 (1980-04-01), Brotzmann et al.
patent: 4531973 (1985-07-01), Nixon

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