Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1974-07-31
1976-10-12
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 26, C21C 552
Patent
active
039855449
ABSTRACT:
The invention relates to a method of combined production of electrical energy and crude iron, comprising reducing iron oxides while keeping the temperature below the melting point of the crude iron during a pre-reduction and above said melting point during a final reduction. The pre-reduction is made by introducing carbonaceous material and the material containing iron oxides into a fluid bed containing solid carbonaceous material, producing reducing gases in the fluid bed by partial combustion of the carbonaceous material with air/or oxygen gas, pre-reducing the iron oxides by said reducing gases until the material has achieved a metallization degree of 30-80 %, most of the heat requirement of the pre-reduction being covered by said combustion. The pre-reduced material is finally reduced and molten by being brought into contact with carbon, and the heat requirement of this final reduction and melting process is covered by electric heating. A substantial part of the exhaust gases from the reduction operations is passed to a thermal power station to generate electrical power therein.
REFERENCES:
patent: 2066665 (1937-01-01), Baily
patent: 2742353 (1956-04-01), Ogorzaly
patent: 2894831 (1959-07-01), Old et al.
patent: 3150961 (1964-09-01), Collin
patent: 3888658 (1975-06-01), Shoupp et al.
Collin Per Harald
Johansson Folke Karl Evald
Andrews M. J.
Stora Kopparbergs Bergslags Aktiebolag
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