EP0172913B1 - Vorrichtung und verfahren zur beseitigung von unreinheiten aus aus einem schachtofen fliessendem geschmolzenen eisen - Google Patents

Vorrichtung und verfahren zur beseitigung von unreinheiten aus aus einem schachtofen fliessendem geschmolzenen eisen Download PDF

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Publication number
EP0172913B1
EP0172913B1 EP19850900768 EP85900768A EP0172913B1 EP 0172913 B1 EP0172913 B1 EP 0172913B1 EP 19850900768 EP19850900768 EP 19850900768 EP 85900768 A EP85900768 A EP 85900768A EP 0172913 B1 EP0172913 B1 EP 0172913B1
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EP
European Patent Office
Prior art keywords
pig iron
hot
molten pig
molten
reaction zone
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.)
Expired
Application number
EP19850900768
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English (en)
French (fr)
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EP0172913A4 (de
EP0172913A1 (de
Inventor
Kenzo Yamada
Katsuhiro Iwasaki
Mitsuru Ohtsuki
Haruo Ito
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JFE Engineering Corp
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Nippon Kokan Ltd
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Filing date
Publication date
Priority claimed from JP59019181A external-priority patent/JPS60162715A/ja
Priority claimed from JP59019178A external-priority patent/JPS60162711A/ja
Priority claimed from JP59019180A external-priority patent/JPS60162714A/ja
Priority claimed from JP59019177A external-priority patent/JPS60162710A/ja
Priority claimed from JP59019182A external-priority patent/JPS60162716A/ja
Priority claimed from JP59019179A external-priority patent/JPS60162713A/ja
Application filed by Nippon Kokan Ltd filed Critical Nippon Kokan Ltd
Publication of EP0172913A1 publication Critical patent/EP0172913A1/de
Publication of EP0172913A4 publication Critical patent/EP0172913A4/de
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Publication of EP0172913B1 publication Critical patent/EP0172913B1/de
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, such as disclosed in the preamble of claim 1.
  • a method is also provided to this effect, such as disclosed in the preamble of claim 5.
  • Methods are known for removing at least one 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.
  • One of the above-mentioned conventional methods 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. When both a granular flux for removing silicon and a granular flux for removing sulfur are blown through the single lance into 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. Thus, at least two of the impurities contained in molten pig iron cannot be removed efficiently by the application of the prior art 2.
  • an arc furnace for producing half steel is known from the German Patent Publication DE-B-1800131 (prior art 3) in which half steel is introduced into a refining chamber having a bottom in the form of a trough such that only a small quantity of molten half steel or refined steel can flow over the higher border of weir of the trough from one refining chamber into another.
  • flux matrial is introduced through another lance, thereby causing strong agitation of the molten metal bath.
  • Prior art 3 thus concerns a continuous steel production furnace in which steel is refined by the removal of certain impurities, including carbon, by the injection of both oxygen and flux material.
  • An object of the present invention is therefore to provide an apparatus and a method 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
  • Another object of the present invention is to provide a method for removing impurities from molten pig iron tapped from a blast furnace and flowing through a hot-metal runner into a hot-metal ladle.
  • 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 1b and 1c of the hot-metal runner 1.
  • the lower end of the skimmer 3 is immersed into molten pig iron 5 flowing through the.
  • 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 into the hot-metal runner 1 between the opposite side walls 1b and 1c 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 1a 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.
  • 11 a is a first tank for receiving a granular flux to be supplied through a conduit 11' to each of the two first lances 8a
  • 11 b 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 1a 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 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 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.
  • 11c 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 dvscharged 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 blastfurnace 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, Then, 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 71 a 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 1 b and 1 c 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 1 a 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-metal 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 the 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)

Claims (12)

1. Vorrichtung zum Entfernen von Verunreinigungen, die in aus einem Hochofen abgestochener Roheisenschmelze enthalten sind, umfassend:
eine Schmelzenfüllrinne (1), die aus einem Hochofen abgestochene Roheisenschmelze (5) in eine Gießpfanne leitet;
eine Schlackenfalle (3), die in der Mitte der Schmelzenfüllrinner (1) vorgesehen ist und schmelzflüssige Hochofenschlacke (7), die auf der Oberfläche der durch die Schmelzenfüllrinne (1) fließenden Roheisenschmelze schwimmt, aufstaut, so daß schmelzflüssige Hochofenschlacke (7) von der Roheisenschmelze (5) getrennt wird, wobei das Unterende der Schlackenfalle (3) in die durch die Schmelzenfüllrinne (1) fließende Roheisenschmelze (5) eintaucht und vom Boden der Schmelzenfüllrinne (1) einen ausreichenden Abstand aufweist, so daß Roheisenschmelze (5) durchfließen kann;
eine Schlackenrinne (2), die in Fließrichtung der Roheisenschmelze (5) aufstrom von der Schlakkenfalle (3) in der Schmelzenfüllrinne (1) vorgesehen ist, um schmelzflüssige Hochofenschlacke (7), die mittels der Schlackenfalle (3) von der Roheisenschmelze (5) getrennt ist, abzuleiten; und
wenigstens eine Blaslanze (8a, 8b, 8c), die im wesentlichen vertikal über der Schmelzenfüllrinne (1) angeordnet ist, um mittels eines Trägergases ein Flußmittelgranulat zum Entfernen von Verunreinigungen, die in aus dem Hochofen abgestochener Roheisenschmelze (5) enthalten sind, in die durch die Schmelzenfüllrinne (1) fließende Roheisenschmelze (5) einzublasen, wobei das unterste Ende der Blaslanze (8a, 8b, 8c) einen vorbestimmten Abstand (HL) von der Oberfläche der durch die Schmelzenfüllrinne (1) fließenden Roheisenschmelze (5) hat;
so daß eine Vereinigung von in der Roheisenschmelze (5) enthaltenen Verunreinigungen mit dem Flußmittelgranulat, das aus der Blaslanze (8a, 8b, 8c) in die durch die Schmelzenfüllrinne (1) fließende Roheisenschmelze (5) geblasen wird, erfolgt unter Bildung von diese Verunreinigungen enthaltender schmelzflüssiger Schlacke; dadurch gekennzeichnet, daß:
in der Schmelzenfüllrinne (1) wenigstens zwei Trennelemente (4a, 4b, 4c) in vorbestimmten Abständen rechtwinklig zur Fließrichtung von Roheisenschmelze (5) und abstrom von der Schlackenfalle (3) vorgesehen sind und die Schmelzenfüllrinne (1) in wenigstens zwei Reaktionszonen (6a, 6b, 6c) unterteilen, wobei das Unterende jedes Trennelements (4a, 4b, 4c) in Roheisenschmelze (5) eintaucht und vom Boden der Schmelzenfüllrinne (1) hinreichend weit beabstandet ist, so daß Roheisenschmelze unter dem jeweiligen Trennelement durchfließen kann;
daß die wenigstens eine Blaslanze (8a, 8b, 8c) jeder der Reaktionszonen (6a, 6b, 6c) zugeordnet ist;
und daß eine Abzweig-Schlackenrinne (9a, 9b, 9c) vorgesehen ist, die jede der Reaktionszonen (6a, 6b, 6c) mit einer Schlackenpfanne oder einer Schlackenbeseitigungseinheit verbindet,
so daß schmelzflüssige Schlacke, die in jeder Reaktionszone (6a, 6b, 6c) durch Vereinigung des aus der jeweiligen Blaslanze (8a, 8b, 8c) in Roheisenschmelze (5), die sequentiell durch die Reaktionszonen (6a, 6b, 6c) fließt, eingeblasenen Flußmittelgranulats mit in der Roheiseinschmelze (5) enthaltenen Verunreinigungen von jedem der Trennelemente (4a, 4b, 4c) aufgestaut, von der Roheisenschmelze (5) getrennt und durch die jeweilige Abzweig-Schlackenrinne (9a, 9b, 9c) aus der jeweiligen Reaktionszone (6a, 6b, 6c) abgeleitet wird.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß:
das Abstromende jeder mit einer entsprechenden Reaktionszone (6a, 6b, 6c) der Schmelzenfüllrinne (1) verbundenen Abzweig-Schlackenrinne (9a, 9b, 9c) mit der Schlackenrinne (2) in Verbindung steht.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß:
das Abstromende jeder mit einer entsprechenden Reaktionszone (6a, 6b, 6c) der Schmelzenfüllrinne (1) verbundenen Abzweig-Schlackenrinne (9a, 9b, 9c) von der Schlackenrinne (2) unabhängig ist und mit einer jeweiligen Schlackenpfanne (12a, 12b, 12c) in Verbindung steht.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß:
sie ferner einen Schmelzabscheider (13) aufweist, der mit jeder der wenigstens zwei Reaktionszonen (6a, 6b, 6c) über eine entsprechende Abzweig-Schlackenrinne (9a, 9b, 9c) und mit der Schlackenrinne (2) verbunden ist, und
daß der Schmelzenabscheider (13) mit dem Abstromteil der am weitesten abstrom befindlichen der wenigstens zwei Reaktionszonen (6a, 6b, 6c) über eine Abzweig-Schmelzenfüllrinne (15) verbunden ist und die Abzweig-Schmelzenfüllrinne an ihrem Aufstromende mit einer Schlackenfalle (14) versehen ist, die vom Boden der Abzweig-Schmelzenfüllrinne (15) einen vorbestimmten Abstand aufweist, so daß Roheisenschmelze, die von im Schmelzenabscheider (13) enthaltener schmelzflüssiger Schlacke getrennt ist, in Richtung zu der am weitesten stromab befindlichen der wenigstens zwei Reaktionszonen (6a, 6b, 6c) durchfließen kann.
5. Verfahren zum Entfernen von Verunreinigungen aus Roheisenschmelze (5), die aus einem Hochofen abgestochen wird und durch eine Schmelzenfüllrinne (1) in eine Gießpfanne fließt, wobei das Verfahren folgende Schritte umfaßt:
Aufstauen von auf der Oberfläche von Roheisenschmelze (5) schwimmender schmelzflüssiger Hochofenschlacke (7) mittels einer Schlackenfalle (3), die in der Mitte der Schmelzenfüllrinne (1) vorgesehen ist, um so schmelzflüssige Hochofenschlacke (7) von Roheisenschmelze (5) zu trennen;
Ableiten von schmelzflüssiger Hochofenschlacke (7), die von Roheisenschmelze (5) getrennt ist, mittels einer Schlackenrinne (2), die aufstrom von der Schlackenfalle (3) vorgesehen ist; und
Einblasen von Flußmittelgranulat mit Hilfe eines Trägergases in Roheisenschmelze (5) unter Bildung einer Reaktionszone zwischen den in der Roheisenschmelze enthaltenen Verunreinigungen und dem Flußmittelgranulat;
gekennzeichnet durch:
Vorsehen von wenigstens zwei Trennelementen (4a, 4b, 4c) hinter der Schlackenfalle (3) von der Aufstrom- zur Abstromseite der Schmelzenfüllrinne (1), um die Schmelzenfüllrinne (1) in wenigstens zwei verschiedene Reaktionszonen (6a, 6b, 6c) zu unterteilen,
gleichzeitiges Entfernen von wenigstens zwei Verunreinigungsarten aus der Roheisenschmelze (5) durch Einblasen eines geeigneten Flußmittelgranulats in jeder der wenigstens zwei Reaktionszonen (6a, 6b und 6c) und durch aufstauen und dann getrenntes Ableiten der als Reaktion zwischen einer bestimmten, in Roheisenschmelze (5) enthaltenen Verunreinigung und einer bestimmten Art von Flußmittelgranulat erzeugten Schlacke (7a, 7b, 7c) aus der in der jeweiligen Reaktionszone (6a, 6b oder 6c) enthaltenen Roheisenschmelze (5).
6. Verfahren nach Anspruch 5, gekennzeichnet durch:
Verwendung von zwei Reaktionszonen, die von der Aufstrom- zur Abstromseite der Schmelzenfüllrinne (1) eine erste Reaktionszone (6a) und eine zweite Reaktionszone (6b) als die wenigstens zwei verschiedenen Reaktionszonen umfassen; und
Verwendung der ersten Reaktionszone (6a) zum Entfernen von Silicium als eine der Verunreinigungen und der zweiten reaktionszone (6b) zum Entfernen von Phosphor oder Schwefel als eine weitere Verunreinigung.
7. Verfahren nach Anspruch 5, gekennzeichnet durch:
Verwendung von zwei Reaktionszonen, die von der Aufstrom- zur Abstromseite der Schmelzenfüllrinne (1) eine erste Reaktionszone (6a) und eine zweite Reaktionszone (6b) als die wenigstens zwei verschiedenen Reaktionszonen umfassen; und
Verwendung der ersten Reaktionszone (6a) zum Entfernen von Schwefel als die eine Verunreinigung und der zweiten Reaktionszone (6b) zum Entfernen von Silicium als eine weitere Verunreinigung.
8. Verfahren nach Anspruch 5, gekennzeichnet durch:
Verwendung von zwei Reaktionszonen (6a, 6b) als die wenigstens zwei verschiedenen Reaktionszonen; und
Verwendung einer der beiden Reaktionszonen (6a, 6b) zum Entfernen von Phosphor als die eine Verunreinigung und der anderen der beiden Reaktionszonen (6a, 6b) zum Entfernen von Schwefel als eine weitere Verunreinigung.
9. Verfahren nach Anspruch 5, gekennzeichnet, durch:
Verwendung von zwei Reaktionszonen (6a, 6b) als die wenigstens zwei verschiedenen Reaktionszonen;
Verwendung einer der beiden Reaktionszonen (6ad, 6b) zum Entfernen von Phosphor als die eine Verunreinigung und der anderen der beiden Reaktionszonen (6a, 6b) zum Entfernen von Schwefel als eine weitere Verunreinigung, und
Einblasen eines Flußmittelgranulats mittels eines Trägergases in Roheisenschmelze (5), die von schmelzflüssiger Hochofenschlacke (7) bedeckt ist und sich aufstrom von der Schlackenfalle (3) befindet, um Silicium als eine weitere Verunreinigung zu entfernen.
10. Verfahren nach Anspruch 5, gekennzeichnet durch:
Verwendung von zwei Reaktionszonen (6a, 6b) als die wenigstens zwei verschiedenen Reaktionszonen; und
Verwendung einer der beiden Reaktionszonen (6a, 6b) zum Entfernen von Silicium und Phosphor als die genannten Verunreinigungen und der anderen der beiden Reaktionszonen (6a, 6b) zum Entfernen von Schwefel als weitere Verunreinigung.
11. Verfahren nach Anspruch 5, gekennzeichnet durch:
Vorsehen einer ersten Reaktionszone (6a), einer zweiten Reaktionszone (6b) und einer dritten Reaktionszone (6c) als die wenigstens zwei verschiedenen reaktionszonen, und zwar ausgehend von der Schlackenfalle (3) in Richtung zur Abstromseite der Schmelzenfüllrinne (1), wobei die erste Reaktionszone (6) zum Entfernen von Silicium als eine der Verunreinigungen, die zweite Reaktionszone (6b) zum Entfernen von Phosphor oder Schwefel als eine weitere Verunreinigung und die dritte Reaktionszone (6c) zum Entfernen von Schwefel oder Phosphor als eine weitere Verunreinigung verwendet wird.
12. Verfahren nach Anspruch 5, gekennzeichnet durch:
Vorsehen einer ersten Reaktionszone (6a), einer zweiten Reaktionszone (6b) und einer dritten Reaktionszone (6c) als die wenigstens zwei verschiedenen Reaktionszonen, und zwar ausgehend von der Schlackenfalle (3) in Richtung zur Abstromseite der Schmelzenfüllrinne (1), wobei die erste Reaktionszone (6a) zum Entfernen von Schwefel als eine der Verunreinigungen, die zweite Reaktionszone (6b) zum Entfernen von Silicium als eine weitere Verunreinigung und die dritte Reaktionszone (6c) zum Entfernen von Phosphor als eine weitere Verunreinigung verwendet wird.
EP19850900768 1984-02-04 1985-02-04 Vorrichtung und verfahren zur beseitigung von unreinheiten aus aus einem schachtofen fliessendem geschmolzenen eisen Expired EP0172913B1 (de)

Applications Claiming Priority (12)

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

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EP0172913A1 EP0172913A1 (de) 1986-03-05
EP0172913A4 EP0172913A4 (de) 1986-06-05
EP0172913B1 true EP0172913B1 (de) 1990-03-07

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DE (2) DE3590051T (de)
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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
IT1234939B (it) * 1985-12-06 1992-06-02 Centro Speriment Metallurg Procedimento per la riduzione del contenuto di impurezze nella ghisa

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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
US3617042A (en) * 1967-08-14 1971-11-02 Nat Res Inst Metals Apparatus for continuous refining of molten metals
DE1800131B1 (de) * 1968-10-01 1971-05-27 Conzinc Riotinto Ltd Mehrzonenschmelzverfahren und Mehrzonenschmelzofen fuer die kontinuierliche Herstellung von Stahl
JPS58130208A (ja) * 1982-01-29 1983-08-03 Nippon Kokan Kk <Nkk> 溶銑予備処理法

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DE3590051C2 (de) 1987-04-16
BR8504996A (pt) 1986-01-21
GB8518758D0 (en) 1985-08-29
GB2162860B (en) 1988-02-03
EP0172913A4 (de) 1986-06-05
IN165408B (de) 1989-10-07
DE3590051T (de) 1986-03-13
EP0172913A1 (de) 1986-03-05
WO1985003525A1 (en) 1985-08-15

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