EP0172913A1 - Procede et dispositif d'extraction des impuretes contenues dans du fer en fusion s'ecoulant d'un four a cuve - Google Patents

Procede et dispositif d'extraction des impuretes contenues dans du fer en fusion s'ecoulant d'un four a cuve Download PDF

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Publication number
EP0172913A1
EP0172913A1 EP85900768A EP85900768A EP0172913A1 EP 0172913 A1 EP0172913 A1 EP 0172913A1 EP 85900768 A EP85900768 A EP 85900768A EP 85900768 A EP85900768 A EP 85900768A EP 0172913 A1 EP0172913 A1 EP 0172913A1
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EP
European Patent Office
Prior art keywords
pig iron
reaction zone
molten pig
hot
molten
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP85900768A
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German (de)
English (en)
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EP0172913A4 (fr
EP0172913B1 (fr
Inventor
Kenzo Yamada
Katsuhiro Iwasaki
Mitsuru Ohtsuki
Haruo Ito
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JFE Engineering Corp
Original Assignee
Nippon Kokan Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP59019179A external-priority patent/JPS60162713A/ja
Priority claimed from JP59019181A external-priority patent/JPS60162715A/ja
Priority claimed from JP59019180A external-priority patent/JPS60162714A/ja
Priority claimed from JP59019182A external-priority patent/JPS60162716A/ja
Priority claimed from JP59019177A external-priority patent/JPS60162710A/ja
Priority claimed from JP59019178A external-priority patent/JPS60162711A/ja
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Publication of EP0172913A1 publication Critical patent/EP0172913A1/fr
Publication of EP0172913A4 publication Critical patent/EP0172913A4/fr
Application granted granted Critical
Publication of EP0172913B1 publication Critical patent/EP0172913B1/fr
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/21—Arrangements of devices for discharging
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/14—Discharging devices, e.g. for slag
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C1/00—Refining of pig-iron; Cast iron

Definitions

  • the present invention relates to an apparatus for removing at least two of such impurities as silicon, phosphorus and sulfur contained in molten pig iron in the middle of a hot-metal runner for directing molten pig iron tapped from a blast furnace into a hot-metal ladle.
  • the above-mentioned conventional method commonly applied so far for removing impurities contained in molten pig iron tapped from the blast furnace in the middle of the hot-metal runner comprises charging a granular flux for removing impurities contained in molten pig iron from a hopper arranged above the hot-metal runner into molten pig iron flowing through the hot-metal runner.
  • This method has however the disadvantage of a low removing efficiency of impurities because of the insufficient contact between molten pig iron and the granular flux as a result of the fact that the charged granular flux floats on the surface of molten pig iron and does not sufficiently penetrate into molten pig iron.
  • the above-mentioned prior art 2 has the following drawbacks:
  • In the prior art 2 there is only a single lance which is substantially vertically arranged above the hot-metal runner for blowing a granular flux.
  • a granular flux for removing silicon and a granular flux for removing sulfur are blown through the single lance into molten pig iron in an attempt to simultaneously remove silicon and sulfur as impurities contained in molten pig iron, molten slag mainly comprising Si0 2 formed as a result of combination with silicon in molten pig iron reduces the removing efficiency of sulfur.
  • molten slag mainly comprising Si0 2 formed as a result of combination with silicon in molten pig iron
  • An object of the present invention is therefore to provide an apparatus for simultaneously and efficiently removing at least two impurities contained in molten pig iron, in which at least one lance is arranged above a hot-metal runner for directing molten pig iron tapped from a blast furnace into a hot-metal ladle so that the lowermost end of the at least one lance is spaced apart by a prescribed distance from the surface of molten pig iron flowing through the hot-metal runner, and a granular flux for removing impurities contained in molten pig iron is blown through the at least one lance by means of a carrier gas into molten pig iron flowing through the hot-metal runner.
  • a carrier gas into molten pig iron flowing through the hot-metal runner
  • an apparatus for removing impurities contained in molten pig iron tapped from a blast furnace which comprises:
  • Fig. 1 is a schematic plan view illustrating a first embodiment of the apparatus of the present invention
  • Fig. 2 is a sectional view illustrating the apparatus of the first embodiment of the present invention cut along the line A-A in Fig. 1. As shown in Figs.
  • a skimmer 3 for damming up molten blast furnace slag 7 floating on the surface of molten pig iron 5 flowing through the hot-metal runner 1 to separate molten blast furnace slag 7 from molten pig iron 5, is provided at right angles to the flowing direction of molten pig iron 5 between opposite side walls lb and lc of the hot-metal runner 1.
  • the lower end of the skimmer 3 is immersed into molten pig iron 5 flowing through the hot-metal runner 1, and is spaced apart from the bottom la of the hot-metal runner 1 by a distance sufficient to allow molten pig iron 5 to pass through.
  • a slag runner 2 for discharging molten blast furnace slag 7 separated from molten pig iron 5 by the skimmer, is provided in the hot-metal runner 1 in the upstream of the skimmer 3 relative to the flowing direction of molten pig iron 5 in the hot-metal runner 1.
  • a first partition 4a and a second partition 4b are provided in the hot-metal runner 1 at prescribed intervals therebetween at right angles to the flowing direction of molten pig iron 5 in the hot-metal runner 1 in the downstream of the skimmer 3 relative to the flowing direction of molten pig iron in the hot-metal runner 1 between the opposite side walls lb and lc of the hot-metal runner 1.
  • the hot-metal runner 1 is divided by these two partitions 4a and 4b, from the upstream toward the downstream thereof, into a first reaction zone 6a and a second reaction zone 6b.
  • the first reaction zone 6a is a reaction zone for removing silicon as one of impurities contained in molten pig iron
  • the second reaction zone 6b is a reaction zone for removing phosphorus or sulfur as one of impurities contained in molten pig iron.
  • the lower end of each of the first partition 4a and the second partition 4b is immersed into molten pig iron 5 flowing through the hot-metal runner 1 and is spaced apart from the bottom la of the hot-metal runner 1 by a distance sufficient to allow molten pig iron 5 to pass through.
  • two first lances 8a for blowing, by means of a carrier gas, a granular flux for removing silicon as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the first reaction zone 6a are substantially vertically arranged so as to pass through a cover 10 covering the first reaction zone 6a.
  • two second lances 8b for blowing, by means of a carrier gas, a granular flux for removing phosphorus.or sulfur as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the second reaction zone 6b are substantially vertically arranged so as to pass through the cover 10 also covering the second reaction zone 6b.
  • each of the first lances 8a and the second lances 8b is spaced apart from the surface of molten pig iron 5 by a prescribed distance.
  • a first branch slag runner 9a is provided in the first reaction zone 6a, and a second branch slag runner 9b is provided in the second reaction zone 6b.
  • the downstream end of each of the first branch slag runner 9a and the second branch slag runner 9b communicates with the slag runner 2.
  • lla is a first tank for receiving a granular flux to be supplied through a conduit 11' to each of the two first lances 8a
  • llb is a second tank for receiving a granular flux to be supplied through a conduit 11' to each of the two second lances 8b.
  • a granular flux for removing silicon as one of impurities contained in molten pig iron is blown through the two first lances 8a by means of carrier gas into molten pig iron 5 flowing through the first reaction zone 6a.
  • molten slag 7a is produced in the first reaction zone 6a through combination of the granular flux blown from the two first lances 8a into molten pig iron 5 flowing through the first reaction zone 6a with silicon contained in molten pig iron, and thus silicon is removed from molten pig iron 5.
  • Molten slag 7a thus produced is dammed up by the first partition 4a, separated from molten pig iron 5, and discharged through the first branch slag runner 9a from the first reaction zone 6a.
  • a granular flux for removing phosphorus or sulfur as one of impurities contained in molten pig iron is blown, in the second reaction zone 6b, through the two second lances 8b by means of a carrier gas into molten pig iron 5 from which silicon has been removed and molten slag 7a has been separated by the first partition 4a as described above.
  • molten slag 7b is produced in the second reaction zone 6b through combination of the granular flux blown from the two second lances 8b into molten pig iron 5 flowing through the second reaction zone 6b with phosphorus or sulfur contained in molten pig iron, and thus phosphorus or sulfur is removed from molten pig iron 5.
  • Molten slag 7b thus produced is dammed up by the second partition 4b, separated from molten pig iron 5, and discharged through the second branch slag runner 9b from the second reaction zone 6b.
  • Molten pig iron 5 from which silicon has thus been removed in the first reaction zone 6a, and then, phosphorus or sulfur has thus been removed in the second reaction zone. 6b, is directed through the hot-metal runner 1 into the hot-metal ladle not shown.
  • molten slags 7a and 7b discharged respectively through the first branch slag runner 9a and the second branch slag runner 9b from the first reaction zone 6a and the second reaction zone 6b are directed to the slag runner 2, and then further directed, together with molten blast furnace slag 7, through the slag runner 2 to a slag ladle or a slag disposal equipment not shown.
  • Fig. 11 is a schematic cross-sectional view of a hot-metal runner illustrating blowing of a granular flux through a lance into molten pig iron in the apparatus of the present invention.
  • the lowermost end of the first lance 8a for example, is spaced apart by a prescribed distance from the surface of molten pig iron 5 flowing through the hot-metal runner 1.
  • This arrangement makes it possible to blow.a granular flux 16 into molten pig iron 5 by means of a carrier gas without the fusion of the first lance 8a or damage to the bottom la of the hot-metal runner 1.
  • the two reaction zones may comprise, in addition to comprising the first reaction zone 6a for removing silicon as one of impurities contained in molten pig iron and the second reaction zone 6b for removing phosphorus or sulfur as one of impurities contained in molten pig iron as described above, the following reaction zones:
  • Fig. 3 is a schematic plan view illustrating a second embodiment of the apparatus of the present invention
  • Fig. 4 is a sectional view illustrating the apparatus of the second embodiment of the present invention cut along the line B-B in Fig. 3.
  • a first partition 4a and a second partition 4b are provided in the hot-metal runner 1 at prescribed intervals therebetween at right angles to the flowing direction of molten pig iron 5 in the hot-metal runner 1 in the downstream of the skimmer 3 relative to the flowing direction of molten pig iron in the hot-metal runner 1.
  • the hot-metal runner 1 is divided by these two partitions 4a and 4b, from the upstream toward the downsteam thereof, into a first reaction zone 6a and a second reaction zone 6b.
  • the first reaction zone 6a is a reaction zone for removing phosphorus as one of impurities contained in molten pig iron
  • the second reaction zone 6b is a reaction zone for removing sulfur as one of impurities contained in molten pig iron.
  • two first lances 8a for blowing, by means of a carrier gas, a granular flux for removing phosphorus as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the first reaction zone 6a are substantially vertically arranged so as to pass through a cover 10 covering the first reaction zone 6a.
  • two second lances 8b for blowing, by means of a carrier gas, a granular flux for removing sulfur as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the second reaction zone 6b are substantially vertically arranged so as to pass through the cover 10 also covering the second reaction-zone 6b.
  • each of the first lances 8a and the second lances 8b is spaced apart from the surface of molten pig iron 5 by a prescribed distance.
  • a first branch slag runner 9a is provided in the first reaction zone 6a, and a second branch slag runner 9b is provided in the second reaction zone 6b.
  • the downstream end of each of the first branch slag runner 9a and the second branch slag runner 9b communicates with the slag runner 2.
  • two third lances 8c for blowing,by means of a carrier gas, a granular flux for removing silicon as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the hot-metal runner 1, are substantially vertically arranged above the hot-metal runner 1 in the upstream of the skimmer 3 relative to the flowing direction of molten pig iron in the hot-metal runner 1 so as to pass through the cover 10 covering the hot-metal runner 1.
  • the lowermost end of each of the third lances 8c is spaced apart from the surface of molten pig iron 5 by a prescribed distance.
  • llc is a tank for receiving a granular flux to be supplied through a conduit 11' to each of the two third lances 8c.
  • a granular flux for removing silicon as one of impurities contained in molten pig iron is blown, in the upstream of the slag skimmer 3, through the two third lances 8c by means of a carrier gas into molten pig iron 5 tapped from a blast furnace not shown and flowing through the hot-metal runner 1.
  • molten slag 7c is produced through combination of the granular flux blown from the two third lances 8c into molten pig iron 5 flowing through the hot-metal runner 1 with silicon as one of impurities contained in molten pig iron, and silicon is thus removed from molten pig iron 5.
  • Molten slag 7c thus produced is dammed up by the skimmer 3, separated from molten pig iron 5, and discharged from the hot-metal runner 1 through the slag runner 2, together with molten blast furnace slag 7 separated from molten pig iron.
  • a granular flux for removing phosphorus as one of impurities contained in molten pig iron is blown, in the first reaction zone 6a, through the two first lances 8a by means of a carrier gas into molten pig iron 5 from which silicon has thus been removed and molten blast furnace slag 7 and molten slag 7c have thus been separated by the skimmer 3.
  • molten slag 7a is produced in the first reaction zone 6a through combination of the granular flux blown from the two first lances 8a into molten pig iron 5 flowing through the first reaction zone 6a with phosphorus contained in molten pig iron, and phosphorus is thus removed from molten pig iron 5.
  • Molten slag 7a thus produced is dammed up by the first partition 4a, separated from molten pig iron 5, and discharged through the first branch slag runner 9a from the first reaction zone 6a.
  • a granular flux for removing sulfur as one of impurities contained in molten pig iron is blown, in the second reaction zone 6b, through the two second lances 8b by means of a carrier gas into molten pig iron 5 from which phosphorus has thus been removed and molten slag 7a has thus been separated by the first partition 4a.
  • molten slag 7b is produced in the second reaction zone 6b through combination of the granular flux blown from the two second lances 8b into molten pig iron 5 flowing through the second reaction zone 6b with sulfur contained in molten pig iron, and sulfur is thus removed from molten pig iron 5.
  • Molten slag 7b thus produced is dammed up by the second partition 4b, separated from molten pig iron 5, and discharged from the second reaction zone 6b through the second branch slag runner 9b.
  • molten slags 7a and 7b discharged respectively through the first branch slag runner 9a and the second branch slag runner 9b respectively from the first reaction zone 6a and the second reaction zone 6b, are directed to the slag runner 2, and then further directed, together with molten blast furnace slag 7 and molten slag 7c, through the slag runner 2 to a slag ladle or a slag disposal equipment not shown.
  • the first reaction zone 6a may be used as a reaction zone for removing sulfur as one of impurities contained in molten pig iron
  • the second reaction zone 6b may be used as a reaction zone for removing phosphorus as one of impurities contained in molten pig iron.
  • the granular flux for removing silicon as one of impurities is blown through the two third lances 8c by means of the carrier gas into molten pig iron 5, on the surface of which molten blast furnace slag 7 floats, in the hot-metal runner 1 in the upstream of the skimmer 3. Because of the very high content of CaO, molten blast furnace slag 7 has a high basicity.
  • molten slag 7c mainly comprising Si0 2 and having a low basicity, which has been produced through combination of the granular flux for removing silicon, blown.through the two third lances 8c by means of the carrier gas, with silicon contained in molten pig iron, is mixed with the above-mentioned molten blast furnace slag 7 having a high basicity.
  • Molten slag 7c of which basicity has thus been increased, is improved in fluidity, and is smoothly discharged from the hot-metal runner 1 through the slag runner 2 together with molten blast furnace slag 7.
  • Fig. 5 is a schematic plan view illustrating a third embodiment of the apparatus of the present invention
  • Fig. 6 is a sectional view illustrating the apparatus of the third embodiment of the present invention cut along the line C-C in Fig. 5.
  • a first partition 4a and a second partition 4b are provided in the hot-metal runner 1 at prescribed intervals therebetween at right angles to the flowing direction of molten pig iron 5 in the hot-metal runner 1 in the downstream of the skimmer 3 relative to the flowing direction of molten pig iron in the hot-metal runner 1.
  • the hot-metal runner 1 is divided by these two partitions 4a and 4b, from the upstream toward the downstream thereof, into a first reaction zone 6a and a second reaction zone 6b.
  • the first reaction zone 6a is a reaction zone for removing silicon and phosphorus as impurities contained in molten pig iron
  • the second reaction zone 6b is a reaction zone for removing sulfur as one of impurities contained in molten pig iron.
  • two third lances 8c for blowing, by means of a carrier gas, a granular flux for removing sulfur as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the second reaction zone 6b, are substantially vertically arranged so as to pass through the cover 10 also covering the second reaction zone 6b.
  • the lowermost end of each of the first lances 8a, the second lances 8b and the third lances 8c is spaced apart from the surface of molten pig iron 5 by a prescribed distance.
  • a first branch slag runner 9a is provided in the first reaction zone 6a
  • a second branch slag runner 9b is provided in the second reaction zone 6b.
  • the downstream end of each of the first branch slag runner 9a and the second branch slag runner 9b communicates with the slag runner 2.
  • a granular flux for removing silicon as one of impurities contained in molten pig iron is blown, in the first reaction zone 6a, through the two first lances 8a by means of a carrier gas, and a granular flux for removing phosphorus as one of impurities contained in molten pig iron is blown, also in the first reaction zone 6a, through the two second lances 8b by means of a carrier gas, into molten pig iron 5 from which molten blast furnace slag 7 has thus been separated by the skimmer 3.
  • molten slag 7a is first produced in the first reaction zone 6a through combination of the granular flux blown from the two first lances 8a into molten pig iron 5 flowing through the first reaction zone 6a with silicon contained in molten pig iron, and silicon is thus removed from molten pig iron 5.
  • molten slag 7b is also produced in the first reaction zone 6a through combination of the granular flux blown from the two second lances 8b with phosphorus contained in molten pig iron, and phosphorus is thus removed from molten pig iron 5.
  • Mixed molten slag comprising molten slag 7a and molten slag 7b is dammed up by the first partition 4a, separated from molten pig iron 5 and discharged from the first reaction zone 6a through the first branch slag runner 9a.
  • a granular flux for removing sulfur as one of impurities contained in molten pig iron is blown, in the second reaction zone 6b, through the two third lances 8c by means of a carrier gas into molten pig iron 5 from which silicon and phosphorus have been removed and molten slags 7a and 7b have been separated by the first partition 4a as described above.
  • molten slag 7c is produced in the second reaction zone 6b through combination of the granular flux blown from the two third lances 8c into molten pig iron 5 flowing through the second reaction zone 6b with sulfur contained in molten pig iron, and sulfur is thus removed from molten pig iron 5.
  • Molten slag 7c thus produced is dammed up by the second partition 4b, separated from molten pig iron 5, and discharged from the second reaction zone 6b through the second branch slag runner 9b.
  • Molten pig iron 5 from which silicon and phosphorus have thus been removed in the first reaction zone 6a and then sulfur has thus been removed in the second reaction zone 6b is directed through the hot-metal runner 1 into the hot-metal ladle not shown.
  • molten slags 7a, 7b and 7c discharged from the first reaction zone 6a and the second reaction zone 6b through the first branch slag runner 9a and the second branch slag runner 9b are directed to the slag runner 2, and then further directed, together with molten blast furnace slag 7, through the slag runner 2 to a slag ladle or a slag disposal equipment not shown.
  • the first reaction zone 6a may be used as a reaction zone for removing sulfur as one of impurities contained in molten pig iron
  • the second reaction zone 6b may be used as a reaction zone for removing silicon and phosphorus as impurities contained in molten pig iron.
  • the granular flux for removing silicon as one of impurities is blown, in the first reaction zone 6a, through the two first lances 8a by means of the carrier gas into molten pig iron 5, and then, the granular flux for removing phosphorus as one of impurities is blown, also in the first reaction zone 6a, through the two second lances 8b by means of carrier gas into molten pig iron 5.
  • Molten slag 7b mainly comprising P 2 0 5 has a high basicity, which molten slag 7b has been produced through combination of the granular flux for removing phosphorus, blown through the two second lances 8b by means of the carrier gas, with phosphorus contained in molten pig iron.
  • Molten slag 7a of which basicity has thus been increased is improved in fluidity, and is smoothly discharged from the first reaction zone 6a through the first branch slag runner 9a together with molten slag 7b. Furthermore, the reaction of the granular flux for removing silicon, blown from the first lances 8a, with silicon contained in molten pig iron becomes more active under the effect of molten slag 7b mainly comprising P 2 0 5 and having a high basicity. It is consequently possible to efficiently remove silicon from molten pig iron 5 flowing through the hot-metal runner 1.
  • Fig. 7 is a schematic plan view illustrating a fourth embodiment of the apparatus of the present invention
  • Fig. 8 is a sectional view illustrating the apparatus of the fourth embodiment of the present invention cut along the line D-D in Fig. 7.
  • a first partition 4a, a second partition 4b and a third partition 4c are provided in the hot-metal runner 1 at prescribed intervals therebetween at right angles to the flowing direction of molten pig iron 5 in the hot-metal runner 1 in the downstream of the skimmer 3 relative to the flowing direction of molten pig iron in the hot-metal runner 1 between the opposite side walls lb and lc of the hot-metal runner 1.
  • the hot-metal runner 1 is divided by these three partitions 4a, 4b and 4c, from the upstream toward the downstream thereof, into a first reaction zone 6a, a second reaction zone 6b and a third reaction zone 6c.
  • the first reaction zone 6a is a reaction zone for removing silicon as one of impurities contained in molten pig iron
  • the second reaction zone 6b is a reaction zone for removing phosphorus as one of impurities contained in molten pig iron
  • the third reaction zone 6c is a reaction zone for removing sulfur as one of impurities contained in molten pig iron.
  • the lower end of each of the first partition 4a, the second partition 4b and the third partition 4c is immersed into molten pig iron 5 flowing through the hot-metal runner 1, and is spaced apart from the bottom la of the hot-metal runner 1 by a distance sufficient to allow molten pig iron 5 to pass through.
  • two first lances 8a for blowing, by means of a carrier gas, a granular flux for removing silicon as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the first reaction zone 6a are substantially vertically arranged so as to pass through a cover 10 covering the first reaction zone 6a.
  • two second lances 8b for blowing, by means of a carrier gas, a granular flux for removing phosphorus as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the second reaction zone 6b are substantially vertically arranged so as to pass through the cover 10 also covering the second reaction zone 6b.
  • two third lances 8c for blowing, by means of carrier -gas, a granular flux for removing sulfur as one of impurities contained in molten pig iron into molten pig iron 5 flowing through the third reaction zone 6c, are substantially vertically arranged so as to pass through the cover 10 also covering the third reaction zone 6c.
  • a first branch slag runner 9a is provided in the first reaction zone 6a
  • a second branch slag runner 9b is provided in the second reaction zone 6b
  • a third branch slag runner 9c is provided in the third reaction zone 6c.
  • the downstream end of each of the first branch slag runner 9a, the second branch slag runner 9b and the third branch slag runner 9c communicates with the slag runner 2.
  • a granular flux for removing silicon as one of impurities contained in molten pig iron is blown, in the first reaction zone 6a, through the two first lances 8a by means of a carrier gas into molten pig iron 5 flowing through the first reaction zone 6a.
  • molten slag 7a is produced in the first reaction zone 6a through combination of the granular flux blown from the two first lances 8a into molten pig iron 5 flowing through the first reaction zone 6a with silicon contained in molten pig iron, and silicon is thus removed from molten pig iron 5.
  • Molten slag 7a thus produced is dammed up by the first partition 4a, separated from molten pig iron 5, and discharged from the first reaction zone 6a through the first branch slag runner 9a.
  • a granular flux for removing phosphorus as one of' impurities contained in molten pig iron is blown, in the second reaction zone 6b, through the two second lances 8b by means of a carrier gas into molten pig iron 5 from which silicon has been removed and molten slag 7a has been separated by the first partition 4a as described above.
  • molten slag 7b is produced in the second reaction zone 6b through combination of the granular flux blown from the two second lances 8b into molten pig iron 5 flowing through the second reaction zone 6b with phosphorus contained in molten pig iron, and phosphorus is thus removed from molten pig iron 5.
  • Molten slag 7b thus produced is dammed up by the second partition 4b, separated from molten pig iron 5, and discharged from the second reaction zone 6b through the second branch slag runner 9b.
  • a granular flux for removing sulfur as one of impurities contained in molten pig iron is blown, in the third reaction zone 6c, through the two third lances 8c by means of a carrier gas into molten pig iron 5 from which phosphorus has been removed and molten slag 7b has been separated by the second partition 4b, as described above.
  • molten slag 7c is produced in the third reaction zone 6c through combination of the granular flux blown from the two third lances 8c into molten pig iron 5 flowing through the third reaction zone 6c with sulfur contained in molten pig iron, and sulfur is thus removed from molten pig iron 5.
  • Molten slag 7c thus produced is dammed up by the third partition 4c, separated from molten pig iron 5, and discharged from the third reaction zone 6c through the third branch slag runner 9c.
  • Molten pig iron 5 from which silicon has been removed in the first reaction zone 6a, then phosphorus has been removed in the second reaction zone 6b, and then, sulfur has been removed in the third reaction zone 6c, is directed through the hot-meral runner 1 into the hot-metal ladle not shown.
  • molten slags 7a, 7b and 7c discharged respectively from the first reaction zone 6a, the second reaction zone 6b, and the third reaction zone 6c, respectively through the first branch slag runner 9a, the second branch slag runner 9b, and the third branch slag runner 9c, are directed to a slag runner 2, and further directed, together with molten blast furnace slag 7, through the slag runner 2 to a slag ladle or a slag disposal equipment not shown.
  • the three reaction zones comprise, as described above, the first reaction zone 6a for removing silicon as one of impurities contained in molten pig iron, the second reaction zone 6b for removing phosphorus as one of impurities contained in molten pig iron, and the third reaction zone 6c for removing sulfur as one of impurities contained in molten pig iron.
  • These reaction zones may also be used as follows:
  • silicon is removed from molten pig iron 5 in the first reaction zone 6a after molten blast furnace slag 7 floating on the surface of molten pig iron flowing through the hot-metal runner 1 has been dammed up by the skimmer 3, separated from molten pig iron 5, and discharged through the slag runner 2. Then, phosphorus is removed from molten pig iron in the second reaction zone 6b, and then, sulfur is removed from molten pig iron in the third reaction zone 6c.
  • Fig. 9 is a schematic plan view illustrating a fifth embodiment of the apparatus of the present invention.
  • the apparatus of the fifth embodiment is identical with those of the above-mentioned embodiments except that the downstream end of each of the branch slag runners 9a, 9b, 9c is independent of the slag runner 2.
  • Fig. 9 illustrates the apparatus of the fourth embodiment described above with reference to Figs. 7 and 8, of which the downstream end of each of the branch slag runners 9a, 9b, 9c is made independent of the slag runner 2. As shown in Fig.
  • slag ladles 12a, 12b and 12c for receiving molten slags discharged through the first branch slag runner 9a, the second branch slag runner 9b and the third branch slag runner 9c are arranged at respective ends of these branch slag runners. Therefore, molten slags discharged from individual reaction zones 6a, 6b, 6c are never mixed with molten blast furnace slag discharged from the hot-metal runner 1 through the slag runner 2.
  • Fig. 10 is a schematic plan view illustrating a sixth embodiment of the apparatus of the present invention.
  • the apparatus of the sixth embodiment is identical with those of the above-mentioned embodiments except that a hot-metal separator 13 for separating molten pig iron entangled into molten slag produced in each of the reaction zones 6a, 6b, 6c from these molten slag is provided in the middle of the branch slag runners 9a, 9b, 9c.
  • Fig. 10 illustrates the apparatus of the third embodiment described above with reference to Figs. 5 and 6, which is provided with the above-mentioned hot-metal separator 13. As shown in Fig.
  • the hot-metal separator 13 is provided in the middle of the first branch slag runner 9a for discharging molten slag produced in the first reaction zone 6a therefrom.
  • the second branch slag runner 9b for discharging molten slag produced in the second reaction zone 6b therefrom is also connected to the hot-metal separator 13.
  • the hot-metal separator 13 is connected to the second reaction zone 6b through a branch hot-metal runner 15 for returning molten pig iron separated by the hot-metal separator 13 into the downstream of the second reaction zone 6b.
  • a skimmer 14 is provided at the upstream end of the branch hot-metal runner 15. The lower end of the skimmer is spaced apart by a prescribed distance from the bottom of the branch hot-metal runner 15 so as to allow molten pig iron separated from molten slags to pass through.
  • molten slag discharged from the first reaction zone 6a which is the mixture of molten slag produced through combination of the granular flux for removing silicon with silicon contained in molten pig iron, on the one hand, and molten slag produced through combination of the granular flux for removing phosphorus with phosphorus contained in molten pig iron, on the other hand, is directed to the hot-metal separator 13 through the first branch slag runner 9a.
  • Molten slag discharged from the second reaction zone 6b which is produced through combination of the granular flux for removing sulfur with sulfur contained in molten pig iron, is also directed to the hot-metal separator 13 through the second branch slag runner 9b.
  • Molten pig iron entangled into these molten slags is separated from molten slags through precipitation in the hot-metal separator 13.
  • Molten pig iron thus separated from molten slags is returned from the hot-metal separator 13 through the branch hot-metal runner 15 to the second reaction zone 6b.
  • Molten pig iron thus returned joins molten pig iron from the first reaction zone 6a in the second reaction zone 6b, and sulfur contained in molten pig iron is removed.
  • molten slags from which molten pig iron has been separated are directed from the hot-metal separator 13 through the downstream portion 9a' of the first branch slag runner 9a to the slag runner 2, and then further directed, together with molten blast furnace slag, through the slag runner 2 to a slag ladle or a slag disposal equipment not shown.
  • the apparatus of the sixth embodiment therefore, it is possible to recover molten pig iron entangled in molten slags which are produced in the reaction zones 6a, 6b, and discharged through the branch slag runners 9a, 9b.
  • the number of the reaction zones formed by dividing the hot-metal runner 1 is not limited to two or three as described above, but may be four or more, in response to the number of impurities to be removed from molten pig iron tapped from the blast furnace. By doing so, it is possible to remove impurities other than silicon, phosphorus and sulfur contained in molten pig iron tapped from the blast furnace.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

Un entonnoir à scories (2N) permettant d'extraire les scories en fusion d'un four à cuve, isolées du fer en fusion à l'aide d'une écumoire (3), est disposé en amont de l'écumoire (3) montée à mi-chemin sur un entonnoir de fer en fusion (1), et au moins deux parois de séparation (4a, 4b, 4c) sont disposées à une distance prédéterminée dans l'entonnoir (1) en aval de l'écumoire (3). L'entonnoir (1) est ainsi divisé en au moins deux zones de réaction (6a, 6b, 6c) des lances (8a, 8b, 8c), soufflant un flux de particules pour extraire à l'aide d'un gaz porteur les impuretés contenues dans le fer en fusion, sont disposées sensiblement verticalement au-dessus des deux zones de réaction, les extrémités inférieures des lances étant isolées sensiblement verticalement de la surface du fer en fusion et des entonnoirs de scories de dérivation (9a, 9b, 9c) sont pourvus respectivement d'au moins deux zones de réaction (6a, 6b, 6c).
EP19850900768 1984-02-04 1985-02-04 Procede et dispositif d'extraction des impuretes contenues dans du fer en fusion s'ecoulant d'un four a cuve Expired EP0172913B1 (fr)

Applications Claiming Priority (12)

Application Number Priority Date Filing Date Title
JP19180/84 1984-02-04
JP19177/84 1984-02-04
JP59019179A JPS60162713A (ja) 1984-02-04 1984-02-04 溶銑処理装置
JP59019181A JPS60162715A (ja) 1984-02-04 1984-02-04 溶銑処理装置
JP19182/84 1984-02-04
JP19178/84 1984-02-04
JP19181/84 1984-02-04
JP59019180A JPS60162714A (ja) 1984-02-04 1984-02-04 溶銑処理装置
JP59019182A JPS60162716A (ja) 1984-02-04 1984-02-04 溶銑処理装置
JP59019177A JPS60162710A (ja) 1984-02-04 1984-02-04 溶銑処理装置
JP59019178A JPS60162711A (ja) 1984-02-04 1984-02-04 溶銑処理装置
JP19179/84 1984-02-04

Publications (3)

Publication Number Publication Date
EP0172913A1 true EP0172913A1 (fr) 1986-03-05
EP0172913A4 EP0172913A4 (fr) 1986-06-05
EP0172913B1 EP0172913B1 (fr) 1990-03-07

Family

ID=27548841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850900768 Expired EP0172913B1 (fr) 1984-02-04 1985-02-04 Procede et dispositif d'extraction des impuretes contenues dans du fer en fusion s'ecoulant d'un four a cuve

Country Status (6)

Country Link
EP (1) EP0172913B1 (fr)
BR (1) BR8504996A (fr)
DE (2) DE3590051C2 (fr)
GB (1) GB2162860B (fr)
IN (1) IN165408B (fr)
WO (1) WO1985003525A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2591232A1 (fr) * 1985-12-06 1987-06-12 Centro Speriment Metallurg Procede de reduction de la teneur en impuretes de la fonte

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1200082B (it) * 1985-06-21 1989-01-05 Centro Speriment Metallurg Procedimento per la desolforazione e la deforsforazione della ghisa
LU86689A1 (fr) * 1985-12-03 1987-05-04 Centro Speriment Metallurg Procede d'epuration continue de fonte en fusion

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1326751A (fr) * 1962-05-18 1963-05-10 Broken Hill Pty Co Ltd Installation de fabrication continue de l'acier à l'aide d'oxygène
FR1576970A (fr) * 1967-08-14 1969-08-01
DE1800131B1 (de) * 1968-10-01 1971-05-27 Conzinc Riotinto Ltd Mehrzonenschmelzverfahren und Mehrzonenschmelzofen fuer die kontinuierliche Herstellung von Stahl

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58130208A (ja) * 1982-01-29 1983-08-03 Nippon Kokan Kk <Nkk> 溶銑予備処理法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1326751A (fr) * 1962-05-18 1963-05-10 Broken Hill Pty Co Ltd Installation de fabrication continue de l'acier à l'aide d'oxygène
FR1576970A (fr) * 1967-08-14 1969-08-01
DE1800131B1 (de) * 1968-10-01 1971-05-27 Conzinc Riotinto Ltd Mehrzonenschmelzverfahren und Mehrzonenschmelzofen fuer die kontinuierliche Herstellung von Stahl

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8503525A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2591232A1 (fr) * 1985-12-06 1987-06-12 Centro Speriment Metallurg Procede de reduction de la teneur en impuretes de la fonte

Also Published As

Publication number Publication date
IN165408B (fr) 1989-10-07
EP0172913A4 (fr) 1986-06-05
BR8504996A (pt) 1986-01-21
WO1985003525A1 (fr) 1985-08-15
EP0172913B1 (fr) 1990-03-07
DE3590051C2 (de) 1987-04-16
DE3590051T (de) 1986-03-13
GB2162860B (en) 1988-02-03
GB2162860A (en) 1986-02-12
GB8518758D0 (en) 1985-08-29

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