Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1979-03-22
1981-12-08
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 30, 75 40, C21B 1314
Patent
active
043045952
ABSTRACT:
A method of producing crude iron from sulphidic iron-containing material, where an iron sulphide containing material is charged to a furnace space and there, together with a silica containing material and oxygen, is smelted to an iron-silicate smelt during combustion of sulphidebound sulphur present, so that said smelt contains approximately 70-90% by weight iron calculated as iron (II) oxide. To the smelt is then added a reducing agent in a manner such that the iron content calculated as iron (II) oxide falls to approximately 60% by weight or lower in the presence of lime and/or other fluxing agents and that formed crude iron is separated. The iron content of the iron silicate smelt is then increased by adding further iron sulphide containing material and oxygen for smelting and reducing agent for another reduction.
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patent: 3326671 (1967-06-01), Worner
patent: 3615362 (1971-10-01), Warner
patent: 3725044 (1973-04-01), Morisaki et al.
patent: 3790366 (1974-02-01), Bryk et al.
patent: 3832163 (1974-08-01), Themelis et al.
patent: 4088310 (1978-05-01), Noponen et al.
patent: 4204861 (1980-05-01), Petersson et al.
Andrews M. J.
Boliden Aktiebolag
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