Plant and process for the production of iron melts

Details Plant and process for the production of iron melts Plant and process for the production of iron melts

C - Chemistry, Metallurgy

21

C

C21C 5/52 (2006.01) C21C 5/56 (2006.01) F27B 3/08 (2006.01)

Patent

CA 2217896

In order to profitably process various iron ores having different compositions, a plant for producing iron smelts (24), in particular steel smelts, such as crude steel smelts, has an electric arc furnace vessel (1) and a refiner vessel (3) joined to the furnace vessel (1) by a weir (34). The refiner vessel (3) has an at least partially sloping down bottom, starting from the weir (34), an oxygen supply (35, 36) and an iron smelt discharge aperture (41) arranged in its end area opposite the furnace vessel (1). A decantation vessel (2) follows the furnace vessel (1) and shares therewith a common bottom (18). The end area of the decantation vessel (2) opposite the furnace vessel (1) has a slag discharge aperture (43). A liquid pig iron (20) supply (21) opens into the furnace vessel (1). A solid iron ore (7) preheating shaft (5) arranged above the furnace vessel (1) opens into the furnace vessel (1) through its lid (4) and is closed by a gas-permeable, cooled shut-off device (6). A charging shaft (10) arranged above the furnace vessel (1) opens into the furnace vessel (1) and is closed by a gas-tight, cooled shut-off device.

Afin de pouvoir traiter de manière économique différents minerais de fer ayant différentes compositions, une installation de production de fontes en fer (24), notamment de fontes en acier, telles que des fontes en acier brut, comprend une carcasse (1) de four à arc électrique et une carcasse (3) de raffineur reliée à la carcasse de four (1) par un déversoir et dont le fond descend au moins partiellement en pente depuis le déversoir (34). La carcasse de raffineur (3) comprend en outre un dispositif d'amenée d'oxygène (35, 36) et une percée (41) de fonte en fer ménagée dans sa zone terminale opposée à la carcasse de four (1). Une cuve de décantation (2) reliée à la carcasse de four (1) partage un fond commun (18) avec la carcasse de four (1) et est pourvue d'une percée de scories (43) à son extrémité opposée à la carcasse de four (1). Un dispositif (21) d'amenée de fonte brute liquide (20) débouche dans la carcasse de four (1). Un puits (5) de préchauffage de minerai solide de fer (7) monté au-dessus de la carcasse de four (1) traverse le couvercle (4) de la carcasse de four (1) et est fermé par un dispositif d'obturation refroidi perméable aux gaz (6). Un puits de chargement (10) monté au-dessus de la carcasse de four (1) débouche dans celle-ci et est fermé par un dispositif d'obturation refroidi imperméable aux gaz (11).

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