WO2013088583A1 - Procédé de fabrication d'une matière première de source de fer qui doit être transmise dans un haut-fourneau - Google Patents

Procédé de fabrication d'une matière première de source de fer qui doit être transmise dans un haut-fourneau Download PDF

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Publication number
WO2013088583A1
WO2013088583A1 PCT/JP2011/079269 JP2011079269W WO2013088583A1 WO 2013088583 A1 WO2013088583 A1 WO 2013088583A1 JP 2011079269 W JP2011079269 W JP 2011079269W WO 2013088583 A1 WO2013088583 A1 WO 2013088583A1
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Prior art keywords
blast furnace
iron source
source material
metal salt
aqueous solution
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PCT/JP2011/079269
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English (en)
Japanese (ja)
Inventor
主代　晃一
隆英 樋口
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Ｊｆｅスチール株式会社
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Priority to PCT/JP2011/079269 priority Critical patent/WO2013088583A1/fr
Publication of WO2013088583A1 publication Critical patent/WO2013088583A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/008—Composition or distribution of the charge
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates

Definitions

  • the present invention relates to a method for producing an iron source material for a blast furnace such as sintered ore and iron ore having excellent resistance to reduction powdering.
  • the sintered ore used in the blast furnace causes a remarkable pulverization phenomenon in the relatively low temperature range of 400 to 600 ° C of the blast furnace shaft part. Therefore, the gas permeability in the blast furnace is hindered and the blast furnace condition is deteriorated. It has become. Therefore, a reduction pulverization test that assumes pulverization when hematite is reduced to magnetite at around 550 ° C. in the massive zone in the blast furnace is defined in Japanese Industrial Standard M8720 or ISO 4696-2, and the quality index indicating characteristics is It is indexed as a Reduction Degradation Index (RDI).
  • RDI Reduction Degradation Index
  • Non-Patent Document 1 discloses the mechanism using a calcium chloride aqueous solution.
  • Patent Document 1 and Patent Document 2 an aqueous solution containing chloride is sprayed on or immersed in the sintered ore to form a chloride film around it and improve the anti-reduction powder characteristics. A method has been proposed.
  • Patent Document 3 as a carbon-containing fluid, a heated tar, a powder coke slurry, or a pulverized coal slurry is sprayed on or immersed in a sintered ore so that a carbon-containing substance is introduced into the open pores.
  • Patent Document 4 discloses that the surface of a blast furnace iron source material such as iron ore or sintered ore is coated with a coating of an organic polymer compound, and the open pores present in the blast furnace iron source material are defined as organic polymer compounds.
  • Patent Document 3 when tar is used as a fluid containing carbon, a harsh operation of treating with high-temperature tar is required, and in the method using pulverized coal or pulverized coke slurry, pulverized coal Because powder coke is hydrophobic, it is difficult to prepare a slurry with good dispersibility and to attach a sufficient amount of this slurry to the surface of the raw material for blast furnace iron source. However, there is a drawback that a sufficient effect for improving the property cannot be obtained, and a more effective method is desired.
  • Patent Document 4 when a coating is formed with an acrylic polymer, polyvinyl alcohol, or amylose, which is an organic polymer, there is a problem in economy because it is more expensive than an inorganic substance or a monomer.
  • An object of the present invention is to solve such problems of the prior art and to provide a method for producing an iron source material for a blast furnace having excellent resistance to reduction dusting.
  • An aqueous solution of a metal salt containing at least one metal selected from the group of calcium and magnesium and at least one acid selected from the group of acetic acid, carbonic acid and nitric acid is applied to the surface of the iron source material for blast furnace.
  • a method for producing an iron source material for a blast furnace comprising a first attaching step for attaching.
  • the first attaching step includes spraying or applying the aqueous solution of the metal salt to the iron source material for blast furnace, and attaching the aqueous solution of the metal salt to the iron source material for blast furnace. Of manufacturing iron source material for blast furnace.
  • the blast furnace iron After transporting the blast furnace iron source raw material to the blast furnace by the raw material transport conveyor after the first adhesion step, at least once after passing through the connecting portion of the raw material transport conveyor, the blast furnace iron The manufacturing method of the iron source material for blast furnaces as described in (3) which has a 2nd adhesion process which sprinkles the aqueous solution of the said metal salt to a source material.
  • the manufacturing method of the iron source raw material for blast furnaces of Claim 2 which consists of spraying.
  • the first attaching step comprises (2) spraying an aqueous solution of a metal salt from above the blast furnace iron source material when the blast furnace iron source material is conveyed to the blast furnace by a material conveyor. The manufacturing method of the iron source raw material for blast furnaces of description.
  • the blast furnace iron After transporting the blast furnace iron source material to the blast furnace by the material transport conveyor after the first adhesion step, at least once after passing through the connecting portion of the material transport conveyor, the blast furnace iron The manufacturing method of the iron source material for blast furnaces as described in (6) which has a 2nd adhesion process which sprinkles the aqueous solution of the said metal salt to a source material.
  • the metal salt is at least one metal salt selected from the group consisting of calcium hydrogen carbonate and magnesium hydrogen carbonate.
  • the metal salt is at least one metal salt selected from the group consisting of calcium nitrate and magnesium nitrate.
  • FIG. 2A is a view showing an embodiment in which an aqueous solution of a metal salt is sprayed from above the iron source raw material for a blast furnace while being conveyed by a raw material conveyer
  • FIG. 2B is a blast furnace being conveyed by a raw material conveyer.
  • FIG. 2A shows the embodiment which sprays the aqueous solution of a metal salt from the upper part of the iron source material for industrial use, and sprays the aqueous solution of the metal salt to the iron source material for blast furnace at the connecting part of the raw material transfer conveyor.
  • the iron source material for blast furnace used in the present invention is an iron-containing raw material charged from the top of the blast furnace, mainly sintered ore, iron ore (lump ore), and trivalent iron oxide (hematite). It contains.
  • sintered ore and iron ore will be described.
  • the surface is obtained by combining one or more metals of calcium and magnesium with one or more acids of acetic acid, carbonic acid and nitric acid.
  • An aqueous solution of a metal salt is deposited.
  • An aqueous solution of a metal salt obtained by combining one or more metals of calcium and magnesium and one or more acids of acetic acid, carbonic acid and nitric acid is an aqueous solution of calcium or magnesium acetate, calcium or magnesium Nitrate aqueous solution, calcium or magnesium hydrogen carbonate aqueous solution, or a mixed aqueous solution of two or more of the above aqueous solutions.
  • the reason why the reduced powdering property of the iron source material for blast furnace is improved in the present invention is that calcium chloride precipitates and adheres to the inner wall of the sintered ore in Non-Patent Document 1 and prevents the contact between the ore and the reducing gas and the progress of reduction.
  • the metal salt obtained by combining one or more metals of calcium and magnesium and one or more acids of acetic acid, carbonic acid and nitric acid is a sintered ore. This is thought to be due to the precipitation and adhesion to the inner wall of the steel, preventing the contact between the mineral grains and the reducing gas and delaying the reduction.
  • the iron ore or sintered ore is reduced at a temperature around 400 to 600 ° C. at the upper part of the blast furnace, and the hematite (Fe 2 O 3 ) in the iron ore or sintered ore becomes magnetite (Fe 3 O 4 ). Since this phase change is accompanied by volume expansion, strain or cracks are generated in the iron ore or sintered ore and become brittle, and reduction ore of the iron ore or sintered ore frequently occurs.
  • Salt crystals deposited on the surface of the iron ore or sinter inhibit the diffusion of reducing gas through the pores inside the iron ore or sinter by blocking the pores facing the iron ore or sinter surface.
  • the reduction in the iron ore or sintered ore is delayed, the amount of magnetite produced in the iron ore or sintered ore is reduced, and reduced powdering is suppressed.
  • the precipitated calcium salt crystal or magnesium salt crystal decomposes at a temperature higher than the temperature range where reductive powdering occurs, and changes into an oxide with a reduction in volume, so that it enters the iron ore or sintered ore.
  • the reduction of reducibility is small because the diffusion of the reducing gas through the pores is facilitated and the reduction inside the iron ore or sintered ore proceeds.
  • the volume associated with decomposition increases in the order of carbonate, nitrate, and acetate.
  • the amount of shrinkage is considered to increase, and it is estimated that diffusion of reducing gas through the pores of iron ore or sinter becomes easier in the order of carbonate, nitrate, and acetate.
  • sintered ore with a low SiO 2 content is less reducible than ordinary sintered ore because of less slag, and the reducible index (RI) is as high as 68%, but it is reduced to powder.
  • the RDI is as high as 38% or more.
  • magnesite, bluestone, etc. are effective, but they have a drawback that they are difficult to obtain.
  • the present invention can be utilized more effectively.
  • the SiO 2 content is more preferably 4.6 to 4.9 mass%. Moreover, it is preferable to apply this invention to a high crystal water containing iron ore with remarkable reduction powdering as an iron ore. Highly crystallized water-containing iron ore contains 5 to 10% crystal water.
  • the reducibility of the sintered ore is defined in Japanese Industrial Standard M8713 or ISO7215, and the ultimate reduction rate representing the characteristics is indexed as a reducibility index (RI).
  • the metal salt obtained by combining one or more metals of calcium and magnesium and one or more acids of acetic acid, carbonic acid and nitric acid should be thinly attached to the entire surface of iron ore or sintered ore. It is preferable to produce an effect with a smaller amount of use.
  • the metal salt can be thinly adhered to the iron ore or sintered ore surface by spraying or coating in the form of a solution using water or an organic solvent as a solvent, but calcium or magnesium acetate, nitrate or bicarbonate Is water-soluble, it is preferable to use water which is easily available and inexpensive.
  • calcium or magnesium carbonate Since calcium or magnesium carbonate has low solubility in water, it is preferable to obtain an aqueous solution of calcium bicarbonate or magnesium bicarbonate by dissolving carbonate in carbonated water in which weakly acidic carbonate is dissolved. . Even if calcium carbonate or magnesium carbonate is dissolved in a dilute aqueous solution of acetic acid or nitric acid, the effect of the present invention can be obtained. In this case, part of the carbonate is decomposed to generate carbon dioxide, and acetate or nitrate is generated. It becomes a mixed aqueous solution.
  • an aqueous solution of a metal salt obtained by a combination of at least one metal selected from calcium and magnesium and at least one acid selected from acetic acid, carbonic acid and nitric acid.
  • the amount of the metal salt with respect to the target blast furnace iron source material 1t is 0.1 to 30 mol.
  • the amount of the solution for dissolving the metal salt may be an amount sufficient for the dissolution, and the amount that spreads over the entire iron ore or sintered ore.
  • the amount of the metal salt is preferably 0.3 to 10 mol relative to 1 t of the iron source material for blast furnace.
  • the metal salt aqueous solution is preferably sprayed or applied in an amount of 0.001 to 0.05 ton of aqueous solution per ton of blast furnace iron source material.
  • the metal salt aqueous solution is preferably sprayed or applied in an amount of 0.001 to 0.05 ton of aqueous solution per ton of blast furnace iron source material.
  • the aqueous solution does not spread over the entire iron ore or sintered ore, and the effect of inhibiting the reduction is small and the reduction powdering is not improved.
  • restoration is saturated.
  • the amount is 0.001 to 0.05 tons per ton of blast furnace iron source material to be sprayed or applied with an aqueous solution, the effect of coating the surface of the iron ore or sintered ore with the aqueous solution can be sufficiently obtained.
  • the amount is 0.001 to 0.025 ton per ton of blast furnace iron source raw material.
  • the aqueous metal salt solution preferably has a metal salt concentration of 0.002 to 26 mol / kg. When the amount is less than 0.002 mol / kg, the amount of the metal salt is small, so that the effect of inhibiting the reduction is small and the reduction powdering is not improved.
  • the aqueous metal salt solution has a metal salt concentration of 0.01 to 5 mol / kg, most preferably 0.01 to 1 mol / kg. If the amount is less than 0.01 mol / kg, the improvement of reduced powdering is relatively small, and the cost increases depending on the amount of the drug used. Is 1 mol / kg.
  • FIGS. 1 and 2 are diagrams showing an embodiment of a method for producing an iron source material for a blast furnace according to the present invention, wherein the iron source material for a blast furnace is one or more metals of calcium and magnesium, acetic acid, carbonic acid, The method of manufacturing by spraying the aqueous solution of the metal salt obtained by combining with the 1 or more types of acid of nitric acid is shown.
  • FIG. 1 shows a method of spraying in a yard for a blast furnace iron source material
  • FIG. 2 shows a method of spraying in a blast furnace iron source material conveyor
  • FIG. 2A is a view showing an embodiment in which an aqueous solution of a metal salt is sprayed from above the iron source raw material for a blast furnace while being conveyed by a raw material conveyer
  • FIG. 2B is a blast furnace being conveyed by a raw material conveyer.
  • the metal salt aqueous solution 3 is sprayed from an aqueous solution tank 2 to a pile of iron ore or sintered ore 1 as a blast furnace iron source material deposited in the yard, and spraying equipment 4 such as a spray or a water tank tank ( Spread by watering means such as not shown).
  • FIG. 2 (a) shows an example in which the iron ore or the sintered ore 1 as a blast furnace iron source material is conveyed and moved by the conveying device 5 such as the raw material conveying conveyor.
  • the metal salt aqueous solution 3 is sprayed from the aqueous solution tank 2 from above the sintered ore 1 by a spraying facility 4 such as a spray.
  • FIG. 2B shows the iron ore or sintered ore 1 when the iron ore or sintered ore 1 as a blast furnace iron source material is conveyed and moved by the conveying devices 5a and 5b such as a material conveying conveyor.
  • the metal salt aqueous solution is sprayed by spraying equipment 4a, 4b such as a spray from above, and the metal salt aqueous solution is sprayed by the spraying equipment 4c at the connecting portion from the transport device 5a to the transport device 5b.
  • the aqueous solution of the metal salt can be uniformly attached to the entire surface of the iron source material for blast furnace.
  • the metal salt aqueous solution can be sprayed from below, above, or from the side of the falling iron source material for the blast furnace.
  • the aqueous solution of the metal salt is obtained by using a brush or a flexible material such as resin or cloth. It can be supplied and applied to the surface of the iron source material for blast furnace.
  • Table 2 shows the components of the sintered ore used, and Table 3 shows the components of the iron ore.
  • FIG. 3 shows the results of calcium acetate amount and reduced powder index (RDI).
  • the reduced powder index (RDI) of a sintered ore (Invention Example 1) having a calcium acetate deposition amount of 0.3 mol per ton of blast furnace iron source material produced using the present invention is 33.
  • FIG. 4 shows the results of the amount of magnesium acetate and the reduced powder index (RDI).
  • the reduced powder index (RDI) of sintered ore (Invention Example 2) having a calcium acetate deposition amount of 0.3 mol per ton of blast furnace iron source material produced using the present invention is 32.
  • FIG. 5 shows the results of the amount of dissolved calcium carbonate and the reduced powder index (RDI).
  • the reduced powder index (RD1) of the sintered ore (Invention Example 3) having a calcium carbonate adhesion amount of 0.3 mol per 1 ton of blast furnace iron source material produced using the present invention is 31.
  • FIG. 6 shows the results of the amount of magnesium carbonate dissolved and the reduced powdering index (RDI).
  • the reduced powder index (RDI) of iron ore (invention example 4) having an adhesion amount of 0.3 mol of magnesium carbonate per 1 ton of blast furnace iron source material produced using the present invention is 53%.
  • FIG. 7 shows the results of the dissolved calcium nitrate amount and the reduced powder index (RDI).
  • the reduced powder index (RDI) of sintered ore (Invention Example 5) having a calcium nitrate deposition amount of 0.3 mol per ton of blast furnace iron source material produced using the present invention is 31.
  • Magnesium nitrate aqueous solution is applied to sintered ore with SiO 2 content of 5.1 mass%, sprayed with a sprinkler while changing the molar amount of magnesium nitrate with respect to 1 ton of sintered ore, and reduced to powder after drying at 80 ° C.
  • the index (RDI) was measured.
  • FIG. 8 shows the results of the amount of magnesium nitrate dissolved and the reduced powder index (RDI).
  • the reduced powder index (RDI) of sintered ore (Invention Example 6) having a magnesium nitrate adhesion amount of 0.3 mol per ton of blast furnace iron source material produced using the present invention is 32.
  • a calcium acetate aqueous solution is used for a sintered ore with an SiO 2 content of 4.9 mass%, a reduced powder index (RDI) of 38%, and a reducible index (RI) of 68%.
  • the molar amount of calcium acetate was changed with a sprinkler, and after drying at 80 ° C., the reduced powder index (RDI) and the reducible index (RI) were measured.
  • FIG. 9 shows the results of calcium acetate amount and reduced powder index (RDI).
  • the reduced powder index (RDI) of sintered ore (Invention Example 7) having a calcium acetate adhesion amount of 0.3 mol per 1 ton of blast furnace iron source material produced using the present invention is 35.
  • FIG. 10 shows the results of the calcium acetate amount and the reducibility index (RI).
  • the iron source material for blast furnace produced using the present invention is a reducible index relative to a normal sintered ore that is not treated (corresponding to calcium acetate amount 0, Comparative Example 3). It can be seen that there is little decrease in (RI) and the reduced powder index (RDI) can be improved.
  • a calcium nitrate aqueous solution is used for a sintered ore with a SiO 2 content of 4.9 mass%, a reduced powder index (RDI) of 38%, and a reducible index (RI) of 68%.
  • the molar amount of calcium nitrate was changed with a sprinkler and dried at 80 ° C., and the reduced powder index (RDI) and the reducible index (RI) were measured.
  • FIG. 11 shows the results of calcium nitrate content and reduced powder index (RDI).
  • the reduced powder index (RDI) of the sintered ore (Invention Example 8) having a calcium nitrate adhesion amount of 0.3 mol per ton of the blast furnace iron source material produced using the present invention is 33.
  • FIG. 12 shows the results of calcium nitrate content and reducibility index (RI).
  • the iron source material for blast furnace produced using the present invention is a reducibility index (corresponding to a calcium nitrate amount of 0. Comparative Example 3) that is not treated. It can be seen that the reduction in RI) is small and the reduced powder index (RDI) can be improved.
  • a calcium nitrate aqueous solution is used for a sintered ore with an SiO 2 content of 4.6 mass%, a reduced powder index (RDI) of 42%, and a reducible index (RI) of 73%.
  • the molar amount of calcium nitrate was changed with a sprinkler and dried at 80 ° C., and the reduced powder index (RDI) and the reducible index (RI) were measured.
  • FIG. 13 shows the results of calcium nitrate content and reduced powder index (RDI).
  • the reduced powder index (RDI) of a sintered ore (Invention Example 9) having a calcium nitrate adhesion amount of 0.3 mol per ton of blast furnace iron source material produced using the present invention is 37.
  • FIG. 14 shows the results of calcium nitrate amount and reducibility index (RI).
  • the iron source material for blast furnace produced using the present invention is a reducible index with respect to ordinary sintered ore that is not treated (corresponding to calcium nitrate amount 0, Comparative Example 4). It can be seen that there is little decrease in (RI) and the reduced powder index (RDI) can be improved.
  • FIG. 3 shows the results of calcium acetate amount and reduced powder index (RDI).
  • the reduced powder index (RDI) of the sintered ore (Invention Example 10) having a calcium acetate deposition amount of 0.1 mol per ton of blast furnace iron source material produced using the present invention is 34. %, which is an improvement from 36% of the reduced powder index (RDI) of ordinary sintered ore (corresponding to calcium acetate amount 0, Comparative Example 1) not subjected to the metal salt aqueous solution adhesion treatment.
  • FIG. 4 shows the results of the amount of magnesium acetate and the reduced powder index (RDI).
  • the reduced powder index (RDI) of sintered ore (Invention Example 11) having a calcium acetate deposition amount of 0.1 mol per ton of blast furnace iron source material produced using the present invention is 32. %, which is an improvement from 36% of the reduced powder index (RDI) of ordinary sintered ore (corresponding to magnesium acetate amount 0, Comparative Example 1) not subjected to the metal salt aqueous solution adhesion treatment.
  • FIG. 5 shows the results of the amount of dissolved calcium carbonate and the reduced powder index (RDI).
  • the reduced powder index (RDI) of sintered ore (Invention Example 12) having a calcium carbonate adhesion amount of 0.1 mol per ton of blast furnace iron source material produced using the present invention is 32. %, which is an improvement from 36% of the reduced powder index (RDI) of ordinary sinter (corresponding to calcium carbonate amount 0, Comparative Example 1) not subjected to the metal salt aqueous solution adhesion treatment.
  • FIG. 6 shows the results of the amount of magnesium carbonate dissolved and the reduced powdering index (RDI).
  • the reduced powder index (RDI) of iron ore (invention example 13) having an adhesion amount of magnesium carbonate of 0.1 mol per ton of iron source material for blast furnace manufactured using the present invention is 54%. This was an improvement from 59% of the reduced powder index (RDI) of ordinary iron ore (corresponding to magnesium carbonate amount 0, Comparative Example 2) not subjected to the metal salt aqueous solution adhesion treatment.
  • FIG. 7 shows the results of the dissolved calcium nitrate amount and the reduced powder index (RDI).
  • the reduced powder index (RDI) of a sintered ore (Invention Example 14) having a calcium nitrate adhesion amount of 0.1 mol per ton of blast furnace iron source material produced using the present invention is 32. %, which is an improvement from 36% of the reduced powder index (RDI) of ordinary sintered ore (corresponding to calcium nitrate amount 0, Comparative Example 1) not subjected to the metal salt aqueous solution adhesion treatment.
  • FIG. 8 shows the results of the amount of magnesium nitrate dissolved and the reduced powder index (RDI).
  • the reduced powder index (RDI) of the sintered ore (Invention Example 15) having an adhesion amount of magnesium nitrate of 0.1 mol per ton of blast furnace iron source material produced using the present invention is 32. %, which is an improvement from 36% of the reduced powder index (RDI) of ordinary sinter (corresponding to magnesium nitrate amount 0, Comparative Example 1) not subjected to the metal salt aqueous solution adhesion treatment.
  • a calcium acetate aqueous solution is used for a sintered ore with an SiO 2 content of 4.9 mass%, a reduced powder index (RDI) of 38%, and a reducible index (RI) of 68%.
  • the molar amount of calcium acetate was changed with a sprinkler, and after drying at 80 ° C., the reduced powder index (RDI) and the reducible index (RI) were measured.
  • FIG. 9 shows the results of calcium acetate amount and reduced powder index (RDI).
  • the reduced powder index (RDI) of sintered ore (Invention Example 16) having a calcium acetate deposition amount of 0.1 mol per ton of blast furnace iron source material produced using the present invention is 36.
  • FIG. 10 shows the results of the calcium acetate amount and the reducibility index (RI).
  • the iron source material for blast furnace produced using the present invention is a reducible index relative to a normal sintered ore that is not treated (corresponding to calcium acetate amount 0, Comparative Example 3). It can be seen that there is little decrease in (RI) and the reduced powder index (RDI) can be improved.
  • a calcium nitrate aqueous solution is used for a sintered ore with a SiO 2 content of 4.9 mass%, a reduced powder index (RDI) of 38%, and a reducible index (RI) of 68%.
  • the molar amount of calcium nitrate was changed with a sprinkler and dried at 80 ° C., and the reduced powder index (RDI) and the reducible index (RI) were measured.
  • FIG. 11 shows the results of calcium nitrate content and reduced powder index (RDI).
  • the reduced powder index (RDI) of the sintered ore (Invention Example 17) having a calcium nitrate adhesion amount of 0.1 mol per ton of blast furnace iron source material produced using the present invention is 34.
  • FIG. 12 shows the results of calcium nitrate content and reducibility index (RI).
  • the iron source material for blast furnace produced using the present invention is a reducibility index (corresponding to a calcium nitrate amount of 0. Comparative Example 3) that is not treated. It can be seen that the reduction in RI) is small and the reduced powder index (RDI) can be improved.
  • a calcium nitrate aqueous solution is used for a sintered ore with an SiO 2 content of 4.6 mass%, a reduced powder index (RDI) of 42%, and a reducible index (RI) of 73%.
  • the molar amount of calcium nitrate was changed with a sprinkler and dried at 80 ° C., and the reduced powder index (RDI) and the reducible index (RI) were measured.
  • FIG. 13 shows the results of calcium nitrate content and reduced powder index (RDI).
  • the reduced powder index (RDI) of sintered ore (Invention Example 18) having a calcium nitrate adhesion amount of 0.1 mol per ton of blast furnace iron source material produced using the present invention is 38.
  • FIG. 14 shows the results of calcium nitrate amount and reducibility index (RI).
  • the iron source material for blast furnace produced using the present invention is a reducible index with respect to ordinary sintered ore that is not treated (corresponding to calcium nitrate amount 0, Comparative Example 4). It can be seen that there is little decrease in (RI) and the reduced powder index (RDI) can be improved.
  • Iron source material for blast furnace iron ore or sintered ore
  • Aqueous solution tank 3
  • Spraying equipment 5 Conveying device

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Abstract

La présente invention se rapporte à un procédé de fabrication d'une matière première de source de fer qui présente une excellente résistance à la désintégration par réduction, ladite matière première de source de fer devant être transmise dans un haut-fourneau. Ce procédé est caractérisé par le fait qu'il permet à une solution aqueuse d'un sel métallique d'adhérer à la surface d'une matière première de source de fer qui doit être transmise dans un haut-fourneau, ledit sel métallique étant un sel qui est obtenu en combinant le calcium et/ou le magnésium avec au moins un acide sélectionné dans le groupe constitué par l'acide acétique, l'acide carbonique et l'acide nitrique. Il est préférable que : la solution aqueuse (3) du sel métallique soit amenée à adhérer à la matière première de source de fer (1) par pulvérisation ou par revêtement; la quantité de sel métallique par tonne de matière première de source de fer soit comprise entre 0,1 et 30 moles; et la matière première de source de fer soit un minerai fritté à faible teneur en silice qui présente une teneur en SiO2 qui est égale ou inférieure à 4,9 % en masse.
PCT/JP2011/079269 2011-12-13 2011-12-13 Procédé de fabrication d'une matière première de source de fer qui doit être transmise dans un haut-fourneau WO2013088583A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104313307A (zh) * 2014-10-16 2015-01-28 昆明理工大学 一种烧结矿低温还原粉化助剂及其使用方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53102204A (en) * 1977-02-18 1978-09-06 Sumitomo Metal Ind Ltd Treating method for preventing pulverization of sintered ores dueto reduction
JPH02217408A (ja) * 1989-02-20 1990-08-30 Nippon Steel Corp 高炉操業法
JPH0913107A (ja) * 1995-06-27 1997-01-14 Sumitomo Metal Ind Ltd 高炉操業方法
JP2006291255A (ja) * 2005-04-07 2006-10-26 Sumitomo Metal Ind Ltd 高炉の操業方法
JP2006348364A (ja) * 2005-06-17 2006-12-28 Nippon Steel Corp 焼結鉱への塩化物溶液散布方法
JP2009019252A (ja) * 2007-07-13 2009-01-29 Nippon Steel Corp 高炉用鉄源原料およびその製造方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53102204A (en) * 1977-02-18 1978-09-06 Sumitomo Metal Ind Ltd Treating method for preventing pulverization of sintered ores dueto reduction
JPH02217408A (ja) * 1989-02-20 1990-08-30 Nippon Steel Corp 高炉操業法
JPH0913107A (ja) * 1995-06-27 1997-01-14 Sumitomo Metal Ind Ltd 高炉操業方法
JP2006291255A (ja) * 2005-04-07 2006-10-26 Sumitomo Metal Ind Ltd 高炉の操業方法
JP2006348364A (ja) * 2005-06-17 2006-12-28 Nippon Steel Corp 焼結鉱への塩化物溶液散布方法
JP2009019252A (ja) * 2007-07-13 2009-01-29 Nippon Steel Corp 高炉用鉄源原料およびその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104313307A (zh) * 2014-10-16 2015-01-28 昆明理工大学 一种烧结矿低温还原粉化助剂及其使用方法

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