Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1992-11-19
1994-02-15
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75475, 75500, 75501, 75502, C21B 1312
Patent
active
052862739
ABSTRACT:
This invention provides a method and apparatus whereby steel of various compositions may be produced from iron ore and coal through a series of stages without the intermediate production of liquid iron. A reforming reactor receives top gases from the steel making reactors, and converts them to high reduction potential gases which are returned to the steel making reactors. The iron ore and reductants, such as coal, are charged to a controlled atmosphere reactor which may be an inclined rotary cylindrical shaft. From the controlled atmosphere reactor the charge is moved to a potential shift reactor which is inclined or vertical and encounters increasing heat and rising gases for converting the carbonized sponge into a semi-molten state. The charge then passes to a high temperature reactor where it encounters the reducing gases from the reforming reactor and preheated oxygen to create temperature in which steel is made. Hot gases from the high temperature reactor pass through the PSR and the CAR and are returned to the reforming reactors to complete the cycle.
REFERENCES:
patent: 4032121 (1977-06-01), Stift et al.
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