Document Type and Number:
Japanese Patent JPS4888012
Kind Code:
A
Abstract:
A blast furnace of improved and more readily controllable operation which comprises three sets of tuyeres, i.e., the normal or primary tuyeres at the base or melting zone of the furnace, a second set disposed in the bosh or second zone, preferably above the middle thereof and below the mantel, and a third set of tuyeres disposed in a third zone above the bosh zone and preferably just above the mantel. The second and third tuyere sets are used to introduce reducing gas which mixes with that generated in the furnace to create, limit and control the second and third zones. The furnace atmosphere and operation are controlled and temperatures regulated in each zone to improve permeability of the burden, rate and completion of the reduction and smelting of ore to hot metal and improved utilization of the burden coke by controlled introduction of increments of reducing gases into each of the second and third sets of tuyeres and thence to the furnace zones so formed. Means of re-forming off-take stack gases and of generating reducing gas from a low cost source to provide reducing gases for such introduction are associated with the blast furnace in an advantageous embodiment. A method of operation in reducing ores, for example iron ores, and a system for such operation with production of suitable reducing gases are also provided.
Application Number:
JP1211273A
Publication Date:
November 19, 1973
Filing Date:
January 31, 1973
Export Citation:
International Classes:
C21B5/00; (IPC1-7): F27B1/00
Domestic Patent References:
| JP37008804A |