WO2010032466A1 - Procédé de fabrication de minerais frittés - Google Patents

Procédé de fabrication de minerais frittés Download PDF

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Publication number
WO2010032466A1
WO2010032466A1 PCT/JP2009/004679 JP2009004679W WO2010032466A1 WO 2010032466 A1 WO2010032466 A1 WO 2010032466A1 JP 2009004679 W JP2009004679 W JP 2009004679W WO 2010032466 A1 WO2010032466 A1 WO 2010032466A1
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WIPO (PCT)
Prior art keywords
ore
raw material
iron
sintered
layer
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PCT/JP2009/004679
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English (en)
Japanese (ja)
Inventor
岡崎潤
藤岡裕二
中野正則
斎藤元治
佐藤武彦
岡田務
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新日本製鐵株式会社
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Priority to JP2010504356A priority Critical patent/JP4528362B2/ja
Priority to CN2009801361127A priority patent/CN102159733B/zh
Priority to BRPI0918512-7A priority patent/BRPI0918512B1/pt
Priority to KR1020117005893A priority patent/KR101204525B1/ko
Publication of WO2010032466A1 publication Critical patent/WO2010032466A1/fr

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    • 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
    • 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
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2406—Binding; Briquetting ; Granulating pelletizing
    • 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
    • C22B1/24—Binding; Briquetting ; Granulating
    • C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets

Definitions

  • the present invention relates to a method for producing sintered ore used as an ironmaking raw material, and more particularly to a method for producing sintered ore for improving the product yield and strength of the upper part of the raw material packed bed formed in the sintering pallet.
  • the iron ore produced from the Maramamba deposit and the high phosphorus block man deposit has a smaller particle size and a higher content of crystal water than a good quality hematite ore. Therefore, at the time of sintering, these iron ores cause a decrease in air permeability and a deterioration in sintering reactivity.
  • the existing pisolite ore produced from the pisolite deposit is a high crystal water ore.
  • Ninety percent of the iron ore produced from this psolite deposit, the Maramamba deposit and the high phosphorus block man deposit is iron ore with a crystal water content of 4% by mass or more.
  • the production of sintered ore using a downward suction type sintering machine is performed as follows.
  • Sintering materials include iron-containing materials such as iron ore as the main material and iron-making dust generated in the iron-making process, auxiliary materials such as limestone and serpentine required for the sintering reaction, coke powder as a heat source, etc. These are used in combination with solid fuel.
  • the sintered raw material is mixed and granulated while adding water using a mixing / granulating machine such as a drum mixer before being charged into the lower suction type sintering machine, and processed into pseudo particles.
  • the pseudo particles are mainly composed of core particles having a particle diameter of 1 mm or more and adhering powder having a particle diameter of 0.5 mm or less attached around the core particles.
  • the air permeability in the sintered packed bed formed in the sintering pallet is maintained, and the sintering reaction of the sintering raw material is promoted. And high productivity can be secured.
  • the sintered raw material processed into pseudo particles is charged into the sintering pallet from the feed section of the sintering machine to form a raw material packed layer. Thereafter, in the ignition furnace, the coke powder on the surface of the raw material packed bed is ignited and air is sucked from the lower part of the sintering machine, thereby moving the combustion point of the coke powder to the lower side of the raw material packed bed.
  • ⁇ Sintering reaction proceeds sequentially from the upper layer to the lower layer of the raw material packed bed by the combustion heat of the coke powder, and the sintering is completed by the time the sintered pallet moves and reaches the waste ore part.
  • the sintered cake (lumps) in the sintering pallet is discharged from the waste ore section and then crushed to produce a sintered ore for a blast furnace with a predetermined particle size.
  • Sintered ore powder having a particle size smaller than a predetermined particle size generated in the production of sintered ore cannot be used as a sintered ore for a blast furnace, and therefore is blended in a sintering raw material as a return ore and sintered again.
  • the sintering reaction of the sintering raw material proceeds at around 1200 ° C. mainly by the following initial melt generation and subsequent assimilation reaction. That is, an initial melt of calcium ferrite (CaO—Fe 2 O 3 ) is generated by a reaction between Fe 2 O 3 in the iron-containing raw material and CaO in limestone. Thereafter, an assimilation reaction in which the components in the iron ore and the components in the auxiliary raw material dissolve in the initial melt proceeds.
  • This sintering reaction is an extremely fast reaction that is completed within a few minutes after the initial melt is formed. This reaction greatly affects the product yield and productivity of the sintered ore and the quality of the sintered ore.
  • the air permeability in the sintered layer deteriorates during the sintering operation. Due to the deterioration of the air permeability, uneven burning occurs, so that the product yield and productivity are lowered, and the quality of sintered ore such as strength is also deteriorated.
  • This sintering reaction is the main raw material in the blended raw material, and sinterability (assimilability) due to the mineral composition and properties of iron ore, which accounts for more than 60% of the total, and the air permeability of the sintered raw material packed layer It is greatly influenced by the granulation property that affects
  • Patent Document 1 For example, a method of increasing the solid fuel in the upper layer portion of the raw material packed bed (for example, see Patent Document 1) has been proposed.
  • the solid fuel in the surface layer portion of the raw material packed layer is increased, or CaO and SiO 2 in the auxiliary raw material in the surface layer portion of the raw material packed layer and
  • a ferromagnetic raw material containing a large amount of FeO that easily forms a melt (CaO—SiO 2 —FeO), or an easily meltable iron ore is charged.
  • the present invention is a method for producing a sintered ore using a lower suction type sintering machine, and has a brand excellent in melt permeability into the fine powder portion in the upper layer of the raw material packed layer.
  • the melt of the upper layer of the raw material packed bed is prevented from excessively increasing, the air permeability of the entire raw material packed layer is deteriorated, and reducible and other sintered ore
  • the present inventors diligently studied a method for improving the product yield and strength of the upper layer of the raw material packed layer formed on the sintered pallet in the production of the sintered ore.
  • an iron ore having a melt penetration distance of 4.0 mm or more measured by a melt penetration evaluation test into the iron ore powder is obtained from a sintering pallet. It was confirmed that the product yield and strength of the sintered ore in the upper layer of the raw material packed layer can be improved by selectively charging the upper layer of the raw material packed layer in a predetermined range.
  • the present invention has been made based on the above findings, and the gist of the invention is as follows.
  • the upper layer in the range of 5 to 12% is charged, the other iron ore is charged in the lower layer of the raw material packed layer, and the auxiliary raw material, the solid fuel, and the return ore are added to the raw material packed layer. In the upper layer and the lower layer.
  • the Al 2 O 3 content of the high melt-permeable iron ore may be 0.6% by mass or less.
  • the iron-containing raw material is scaled in the iron making process above the raw material packed bed.
  • the upper layer may be charged in the range of 5 to 12% in terms of the layer thickness ratio with respect to the total layer thickness from the surface.
  • the solid fuel and the return ore may be charged in the same mixing ratio in the upper layer and the lower layer of the raw material packed bed. .
  • the blending ratio of the upper layer may be equal to or less than the blending ratio of the lower layer.
  • the high-melt-penetrating iron ore and the other iron ore are the secondary raw material, the solid fuel, and the return ore. After blending, mixing, and granulating, each of the upper layer and the lower layer of the raw material packed layer may be charged.
  • the highly melt-permeable iron ore is blended with the scale generated in the iron making process as the iron-containing raw material, After blending, mixing, and granulating the solid fuel and the return mineral, the solid fuel may be charged into the upper layer of the raw material packed bed.
  • the melt permeability to the fine powder portion of each brand iron ore to be blended with the sintering raw material is evaluated, and this evaluation result Based on the iron ore of each brand, select the iron ore of the brand excellent in melt penetration into the fine powder part and selectively insert it into the upper layer of the raw material packed bed, so that the upper layer of the raw material packed bed
  • the yield and strength of the product can be improved, and the productivity of sintered ore can be improved.
  • melt infiltration distance iron ore is a diagram showing the relationship between the Al 2 O 3 content. It is a figure which shows the relationship between the limestone ratio in an upper layer, and the product yield of the sintered ore in a sintering pot test.
  • FIG. 1 is a diagram showing an optical microscope structure of a pseudo particle cross section of a sintered raw material collected from a raw material packed layer of a sintering machine.
  • the initial melt is considered to be generated at a portion where iron ore (Fe 2 O 3 ) and limestone (CaO) are in contact with each other.
  • the adhering powder part (fine powder part) of the pseudo raw material of the sintering material consisting of core particles having a particle diameter of 1 mm or more and the adhering powder part having a particle diameter of 0.5 mm or less around it
  • iron ore (Fe 2 O 3 ) and limestone (CaO) are irregularly distributed, and therefore there are few portions in contact with each other.
  • the sintering reaction proceeds as follows. That is, an initial melt of calcium ferrite (CaO—Fe 2 O 3 ) is generated at the portion where the iron ore (Fe 2 O 3 ) and limestone (CaO) are in contact with each other in the adhering powder portion of the pseudo raw material of the sintering raw material. To do. Thereafter, the initial melt penetrates into the adhering powder part, comes into contact with surrounding iron ore and auxiliary materials, and repeats assimilation and coalescence. In this way, the amount of melt increases and a binder phase of sintered ore is formed.
  • the inventors of the present invention have found that the behavior of the initial melt produced in the sintering process penetrates into the iron ore packed bed, that is, the melt permeability depends on the mineral characteristics of the iron ore, and the bonding of the sintered ore. It has been clarified that it greatly affects the phase formation (see ISIJ-Int. 43 (2003), p. 1384).
  • the temperature of the upper layer of the sintering raw material packed bed during the sintering operation tends to be low, and the sintering reaction (anabolic reaction) starts from the formation of the initial melt of iron ore (Fe 2 O 3 ) and limestone (CaO).
  • the time to complete is short. Therefore, the present inventors selectively charged iron ore with high melt permeability into the upper layer of the raw material packed bed in order to improve the product yield of the sintered ore in the upper layer of the raw material packed layer. Then, it was considered effective to promptly infiltrate the produced initial melt into the raw material fine powder part to promote the anabolic reaction.
  • the present invention is made on the basis of this technical idea, and includes iron-containing raw materials including iron ores of a plurality of brands (iron ore brands), secondary raw materials (such as limestone), solid fuel (such as coke), and return ore.
  • the sintered raw material is mixed, granulated, charged on a sintering pallet, and fired.
  • the manufacturing method of the sintered ore has the following characteristics. That is, a melt permeability evaluation test is performed for each iron ore brand, and the melt penetration distance is 4.0 mm from the plurality of brand iron ores based on the measured value of the melt penetration distance of each brand.
  • One or more types of iron ore are selected or blended so as to have the above, and the layer thickness ratio (upper charge layer thickness ratio) to the total layer thickness from the upper surface of the raw material packed layer formed on the sintered pallet is The upper layer is charged so as to be in the range of 5 to 12%.
  • the melt permeability of the iron ore (ease of spreading when the initial melt penetrates into the iron ore powder having a particle size of 0.5 mm or less), and the melt penetration distance (of the melt in the iron ore powder) The permeation distance) can be evaluated and measured by an evaluation test proposed by the present inventors in Japanese Patent Application Laid-Open No. 2002-62290 (hereinafter referred to as “iron ore melt permeability evaluation test”).
  • This melt penetration distance is a weighting of the measured melt penetration distance for each brand of iron ore in order to simplify the measurement when two or more brands of iron ore are blended as the iron ore of the sintering raw material. Average values were used.
  • the weighted average value is also expressed as the melt penetration distance.
  • a plurality of brand iron ores may be blended and the melt penetration distance may be measured as one brand iron ore.
  • the melt penetration distance in the present invention is evaluated by the melt permeability evaluation test of the present invention.
  • the melt penetration distance in the present invention is evaluated by evaluating the melt permeability by other evaluation tests. May be converted into For example, by changing the molding pressure of the iron ore melt permeability test, the size and shape of the iron ore tablet and the initial melt material tablet, the test procedure, etc., are evaluated, and converted into the melt penetration distance in the present invention. May be.
  • the time during which the melt has permeated a predetermined distance may be measured and converted to the melt penetration distance in the present invention. Any physical quantity that can be converted may be used.
  • the melt permeability evaluation test for iron ore in the present invention is performed as follows, and the melt penetration distance is measured.
  • the initial melt material is close to the eutectic composition of the binary system phase diagram of CaO-Fe 2 O 3 CaO: 26 wt%, Fe 2 O 3: As will become 74% by weight of the composition, Fe 2 O 3 reagents and CaO reagent are mixed and mixed in an automatic mortar for 20 minutes. Thereafter, similarly to the iron ore tablet, the initial melt material is molded at a molding pressure of 4 MPa using a mold forming die to produce an initial melt material tablet having a diameter of 5 mm and a height of 5 mm.
  • the initial melt material tablet is placed on the center of the upper surface of the iron ore tablet, charged into a Ni cylindrical crucible (inner diameter 20 mm, height 15 mm), and heated in an air stream in an electric furnace. , Fire. Then, melt penetration distance is measured by cross-sectional observation of the tablet after baking.
  • the sintering heat pattern similar to that of the actual machine is used as the tablet baking condition. That is, the tablet is heated from 1100 ° C. to 1290 ° C. (maximum temperature) in 1 minute, then cooled from 1290 ° C. to 1100 ° C. in 3 minutes, and the tablet is immediately taken out of the furnace and air-cooled.
  • FIG. 2 shows the relationship between the melt penetration distance of the iron ore and the strength SI of the sintered ore
  • FIG. 3 shows the relationship between the iron ore in the actual sintering operation using the iron-containing raw material containing multiple brands of iron ore. The relationship between melt penetration distance and product yield of sintered ore is shown.
  • SI which is an index indicating the strength of sintered ore, is obtained by sampling 10 kg of sintered ore with a particle size of 10 to 25 mm from the sintered ore after measuring the product yield below and dropping it 4 times from a height of 2 m. Is measured.
  • This SI indicates the ratio (mass%) of the mass (kg) of the sintered ore having a particle diameter of 5 mm or more after dropping to the mass (kg) of the sintered ore before dropping.
  • the product yield of sintered ore is measured by dropping the sintered cake (lumps) 5 times from a height of 2 m.
  • the product yield of this sintered ore is the sintered ore with a particle size of 5mm or more after dropping with respect to the mass (kg) of the sintered cake (lumb) before dropping (excluding the bedding ore) , The ratio (mass%) of the mass (kg) of the bedding ore is excluded.
  • the strength SI of the sintered ore is required to be 90.5% or more, and the product yield is required to be 80.0% or more.
  • melt permeability of the iron ore that is, the melt penetration distance measured in the melt permeability evaluation test will be described.
  • Table 1 shows the chemical composition of the main brand iron ore blended in the sintering raw material and the melt penetration distance measured in the melt permeability evaluation test.
  • B (a) and B (b) are two Brazilian ores
  • H (a) and H (b) are two Australian hematite ores
  • M (a) and M (b) Shows two types of Australian maramamba ore.
  • HP (a) and HP (b) are two Australian high phosphate rocks
  • P (a) and P (b) are two Australian pisolite ores
  • HPM is a new Australian blended ore
  • I ( a) and I (b) represent two types of Indian ores.
  • S1 and S2 indicate scales generated in two types of iron making processes.
  • FIG. 5 is a diagram showing a comparison of melt penetration distances of main brand iron ores shown in Table 1. According to Table 1 and FIG. 5, among the main brands of iron ore, two Brazilian ores B (a) and B (b) both have a high melt penetration distance of 4.0 mm or more. I understand.
  • the melt penetration distance is as low as 2.0 mm or less.
  • Australian new blended ore HPM two Australian maramamba ores M (a) and M (b), and two Indian ores I (a) and I (b) have a melt penetration distance. It can be seen that it is in the range of more than 2.0 mm to less than 4.0 mm.
  • Australian pisolite ores P (a) and P (b) are known as easily meltable iron ores that have a high crystallization water content and are easily assimilated and melted in the sintering reaction. However, it can be seen that Australian pisolite ores P (a) and P (b) have a low melt penetration distance of 2.0 mm or less and have poor melt permeability. In addition, it can be seen that the scales S1 and S2 generated in the iron making process differ greatly in the melt permeability distance depending on the type of scale.
  • the iron ore of multiple brands shown in Table 1 is pulverized, and iron ore with a particle size of 0.25 to 0.25 mm is 50% by mass, and iron ore with a particle size of 0.25 mm or less is used.
  • the particle size was adjusted to 50% by mass, and limestone of 0.25 mm or less was mixed with each iron ore so that the CaO concentration was 10% by mass.
  • the sample tablet was placed in a Ni cylindrical crucible having an inner diameter of 20 mm and a height of 15 mm, and fired in an air stream in an electric furnace.
  • a sintering heat pattern similar to that of the actual machine is used as the tablet baking condition. That is, the tablet was heated from 1100 ° C. to 1290 ° C. (maximum temperature) in 1 minute, then cooled from 1290 ° C. to 1100 ° C. in 3 minutes, and the tablet was immediately taken out of the furnace and air-cooled.
  • the strength SI of sintered ore is required to be 90.5% or more, and the product yield is required to be 80.0% or more.
  • a sinter with an intensity SI of 90.5% or more and a product yield of 80.0% or more produced in advance by actual machine sintering operation is collected and dropped.
  • the test was conducted. In this drop test, a sample processed into the same shape as the pot test tablet, that is, a tablet shape having a diameter of 8 mm and a height of 10 mm was used.
  • the strength index (+0.5 mm% value) measured in this drop test was used as an evaluation standard.
  • the strength index (+0.5 mm% value) measured by the above drop test using a sintered ore having a strength SI of 90.5% or more and a product yield of 80.0% or more manufactured by an actual machine sintering operation is 88%. Therefore, in the strength evaluation of the fired tablet, the fired tablet satisfying the drop test strength index (+0.5 mm% value) of 88% or more was evaluated as having good sintered ore strength and product yield.
  • FIG. 6 shows the relationship between the melt penetration distance of each brand iron ore by the tablet firing test and the strength index (+0.5 mm% value) by the drop test.
  • the above drop test strength index (+0.5 mm% value) of 88% or more corresponding to the target sinter strength (SI is 90.5% or more) in actual machine sintering operation is achieved.
  • melt permeability having a melt penetration distance of 4.0 mm or more is required.
  • Specific examples of the iron ore brand having melt permeability having a melt penetration distance of 4.0 mm or more include Brazilian ores B (a) and B (b) shown in Table 1.
  • the iron ore charged in the upper layer of the predetermined range of the sintering raw material packed layer contains two or more types of iron ore
  • each brand of iron ore measured by the melt permeability evaluation test The blending ratio of two or more brands of iron ore is adjusted so that the weighted average value of the stone melt penetration distance is 4.0 mm or more.
  • blended so that a melt penetration distance may be set to 4.0 mm or more is defined as a high melt penetration iron ore.
  • FIG. 7 shows the relationship between the ratio of the thickness of the upper charged layer in which the high melt permeability iron ore is charged and the strength SI of the sintered ore.
  • FIG. 8 shows the relationship between the upper charge layer thickness ratio and the product yield of sintered ore.
  • SI which is an index indicating the strength of sintered ore, was obtained by collecting 10 kg of sintered ore having a particle size of 10 to 25 mm from the sintered ore after the following product yield measurement, and measuring 4 kg from a height of 2 m. It is measured by dropping it twice.
  • This SI indicates the ratio (mass%) of the mass (kg) of the sintered ore having a particle diameter of 5 mm or more after dropping to the mass (kg) of the sintered ore before dropping.
  • the product yield of sintered ore is measured by dropping the sintered cake (lumps) 5 times from a height of 2 m.
  • the product yield of this sintered ore is the sintered ore with a particle size of 5mm or more after dropping with respect to the mass (kg) of the sintered cake (lumb) before dropping (excluding the bedding ore) , The ratio (mass%) of the mass (kg) of the bedding ore is excluded.
  • FIG. 7 and FIG. 8 show the high melt permeability iron ore and other iron ores in the upper layer (A part) and the lower layer (B part) of the sintering pot having a height of 600 mm and a diameter of 300 mm shown in FIG.
  • the test results when stones are charged and fired are shown.
  • the average values of the upper layer (A layer) and the lower layer (B layer) are constant in SiO 2 : 5.01% by mass, CaO / SiO 2 : 1.89, and coke: 4.3% by mass in the sintering raw material. Limestone, coke, and return mineral are blended. These sintered raw materials are used after granulation at a granulation moisture of 7.0% by mass.
  • the other iron ores mean iron ores excluding the iron ore charged in the upper layer.
  • the firing conditions for this sintering pot test were as follows: layer thickness: 600 mm, suction negative pressure: 14.7 KPa, firing time: 27 minutes.
  • the strength and product yield of the sintered ore in the main sintering pot test were evaluated based on the strength of sintered ore SI: 77% and product yield: 76%. These evaluation criteria are shown in Table 2 in which it is confirmed in advance that the strength SI of the sintered ore is 90.5% or more and the product yield is 80.0% or more when the actual machine sintering operation is performed. It was obtained by carrying out a main sintering pot test using a sintering raw material under blending conditions. Therefore, these evaluation criteria correspond to the strength SI (90.5% or more) and the product yield (80.0% or more) of the sintered ore targeted in the actual machine sintering operation.
  • the upper charging layer thickness ratio (layer thickness ratio with respect to the total thickness of the upper layer of the raw material filling layer) needs to be in the range of 5 to 12%.
  • the iron ore with high melt permeability has a low granulation property as described later. Pseudoparticles collapse at the time of entering and in the firing process, and the air permeability in the raw material packed layer tends to be lowered. Therefore, the sinterability of the entire raw material packed layer is deteriorated, and the product yield, strength, and production rate of the sintered ore are deteriorated.
  • the iron ore having high melt permeability is an ore having a low Al 2 O 3 content and a relatively high price, as will be described later. Therefore, it causes an increase in the manufacturing cost of the sintered ore.
  • the product yield and strength of the upper layer of the raw material packed layer are sufficiently improved without reducing the air permeability of the entire raw material packed layer (strength SI is 90.5% or more, and the product yield is 80.%). Therefore, a high melt permeable iron ore selected or blended from multiple brands of iron ore so that the weighted average value of the melt infiltration distance is 4.0 mm or more is applied to the raw material packed bed.
  • the upper layer in the range of 5 to 12% of the total layer thickness from the surface is charged, the other iron ore is charged in the lower layer of the raw material packed bed, and the auxiliary raw material, solid fuel, and return ore Was charged into the upper and lower layers of the raw material packed layer.
  • the mixing ratio of the auxiliary raw material, the solid fuel, and the return ore is the same in the upper layer and the lower layer of the raw material packed bed.
  • the scales S1 and S2 generated in the iron making process can also be charged as an iron-containing raw material into the upper layer with an upper charging layer thickness ratio of 5 to 12%. Good.
  • the scales S1 and S2 may be added to the lower layer as an iron-containing raw material in addition to other iron ores.
  • the high melt permeability iron ore, or the iron-containing raw material combining the high melt permeability iron ore and the scale will be referred to as the high melt permeability iron-containing raw material.
  • only the other iron ore or the iron-containing raw material combining the other iron ore and the scale is used as the other iron-containing raw material.
  • FIG. 9 shows the relationship between the melt penetration distance of each brand of iron ore and the Al 2 O 3 content. As shown in FIG. 9, there is a correlation between the melt infiltration distance and the Al 2 O 3 content, and as the iron ore having the melt infiltration distance: 4.0 mm or more, the Al 2 O 3 content is 0.6% by mass. It is preferable to select the following iron ore brands.
  • the melt permeability of iron ore is not determined only by the Al 2 O 3 content, but is also affected by the structure of the iron ore such as pores. However, when the Al 2 O 3 content in the iron ore increases, the Al 2 O 3 content in the assimilated melt to be generated also increases. Therefore, the viscosity of the melt increases and the melt permeability decreases.
  • the iron ore having a melt penetration distance of 4.0 mm or more charged in the upper layer of the raw material packed layer preferably has an Al 2 O 3 content of 0.6% by mass or less.
  • FIG. 10 shows the relationship between the limestone ratio in the upper layer and the product yield of the sintered ore in the sintering pot test. Moreover, in FIG. 11, the relationship between the limestone ratio in an upper layer and the intensity
  • Brazilian ore B (b) was used as the high melt-permeable iron ore in the upper layer, and the upper charge layer thickness ratio was 11.7%.
  • the sintering raw material of the mixture ratio shown in Table 2 was used.
  • the mixing ratio of the upper auxiliary material is equal to or less than the mixing ratio of the lower auxiliary material from the viewpoint of cost reduction.
  • the method of charging the high melt-permeable iron-containing raw material and other iron-containing raw materials into the upper layer of the raw material packed layer on the sintering pallet and the lower layer of the raw material packed layer, respectively Although not limited, for example, a method as shown in FIG. 13 is used.
  • a first surge hopper (for other iron-containing raw materials) 1 and a second surge hopper (for high melt-permeable iron-containing raw materials) 2 are arranged in series in the machine length direction in the feed section of the downward suction type sintering machine.
  • a sintered raw material 3 made up of other iron-containing raw materials excluding the high melt-permeable iron-containing raw material and limestone, coke, and return ore is placed on a sintering pallet 4. Then, the lower layer 5 of the raw material packed layer is formed.
  • the second surge hopper 2 is charged with a raw material containing high melt permeability iron and a sintering raw material 6 made of limestone, coke and return ore, and on the lower layer 5, a raw material packed layer
  • the upper layer 7 can be formed.
  • the sintering raw material 6 which consists of a highly melt-permeable iron-containing raw material, limestone, coke and return ore, and the other iron-containing raw material, sintering which consists of limestone, coke and return ore
  • the raw material 3 is mixed and granulated using granulators 8 and 9 such as a drum mixer and a pan pelletizer, respectively, to obtain pseudo particles.
  • granulators 8 and 9 such as a drum mixer and a pan pelletizer, respectively, to obtain pseudo particles.
  • the respective sintered raw materials are supplied to a second surge hopper (for high melt-permeable iron-containing raw material) 2 and a first surge hopper (for other iron-containing raw materials) 1.
  • the sintering raw material 6 which consists of a highly melt-permeable iron-containing raw material, limestone, coke and return ore, and the sintering which consists of other iron-containing raw materials, limestone, coke and return ore
  • the raw material 3 is blended so that limestone, coke, and return ore are in a predetermined blending ratio.
  • a production rate shows the value which divided
  • the strength SI of the sinter is measured by taking 10 kg of sintered ore with a particle size of 10 to 25 mm from the sinter after the following product yield measurement and dropping it 4 times from a height of 2 m.
  • the This SI indicates the ratio (mass%) of the mass (kg) of the sintered ore having a particle diameter of 5 mm or more after dropping to the mass (kg) of the sintered ore before dropping.
  • the product yield of sintered ore is measured by dropping a sintered cake (lump) five times from a height of 2 m.
  • the product yield of this sintered ore is calculated based on the mass (kg) of the sintered cake (lumps) before dropping (excluding the bedding ore), but the grain size after dropping: , The ratio (mass%) of the mass (kg) of the bedding ore is excluded.
  • the reduction powder resistance index (RDI) of the sintered ore was measured according to the test method specified in JIS M 8720. That is, 500 g of sintered ore having a particle size of 15 to 19 mm is collected and reduced at 550 ° C. for 30 minutes in a mixed gas of N 2 : 70% and CO: 30%. Thereafter, the reduced sintered ore is charged into a drum and subjected to 900 rotation tests in 30 minutes.
  • the ratio (mass%) of the mass (g) of the sintered ore powder having a particle diameter after rotation of 3 mm or less to the mass (g) of the sintered ore after reduction before the rotation is the reduction dust resistance index (RDI). is there.
  • JIS-RI The JIS reduction ratio (JIS-RI) of the sintered ore was measured according to the test method specified in JIS M 8713. That is, 500 g of sintered ore having a particle size of 19 to 21 mm is collected and reduced at 900 ° C. for 180 minutes in a mixed gas of N 2 : 70% and CO: 30%.
  • the ratio (mass%) of the decrease (g) in mass of sintered ore due to reduction to the mass (g) of oxygen contained in iron oxide of sintered ore before reduction is the JIS reduction rate (JIS-RI). .
  • the high melt permeable iron-containing raw material charged into the upper layer of the raw material packed bed is mixed with limestone, return mineral, and coke and granulated to form pseudo particles, which are shown in FIG. The upper layer).
  • the mixture ratio of limestone, coke, and return mineral is the same as the mixture ratio in the whole charging raw material.
  • the other iron-containing raw materials were mixed with limestone, return mineral, coke, and granulated to form pseudo particles, and charged into part B (lower layer of the raw material packed layer) shown in FIG. .
  • the proportions of coke and limestone (CaO) and return ore in the A part and B part of the sintered raw material packed layer are the same.
  • the high melt permeable iron-containing raw material to be charged into part A is shown in Table 1, two kinds of Brazilian ores B (a) and B (b) having different melt penetration distances, and melt penetration.
  • B part was charged 530 mm from the great surface of the sintered pallet, and A part was placed on B part with a layer thickness of 70 mm (layer thickness ratio to total layer thickness (600 mm): 11.7). %).
  • SiO 2 in the blending raw materials of part A and B 5.01% by mass
  • coke blending 4.3% by mass (each equal to the ratio of the entire sintered raw material)
  • the granulation conditions were granulated moisture: 7.0% by mass.
  • the firing conditions of this sintering pot test were as follows: layer thickness: 600 mm, suction negative pressure: 14.7 KPa, firing time: 27 minutes.
  • Reference Example 1 is a base test in which a plurality of brand iron ores shown in Table 2 are uniformly charged in the packed layer thickness direction as a sintering raw material. Evaluation of strength SI, product yield, production rate and the like of the sintered ore of Examples and Comparative Examples shown below was evaluated based on Reference Example 1.
  • Example 1 a Brazilian ore B (a) having a melt penetration distance: 4.65 mm shown in Table 1 was selectively charged into part A (upper layer of the raw material packed bed), and the remaining iron-containing raw material ( This is an example in which the other iron-containing raw material) is charged into part B (the lower layer of the raw material packed layer).
  • Example 2 the Brazilian ore B (b) having a melt penetration distance: 4.22 mm shown in Table 1 was selectively charged in part A, and the remaining iron-containing raw material was charged in part B. It is an example.
  • Example 1 and Example 2 the product yield and strength SI of the sintered ore were improved and the production rate was improved as compared with Reference Example 1 without impairing the reduction-resistant powdered RDI and the reduction rate JIS-RI. Improved.
  • Example 3 is a mixture ratio P of Brazilian ore B (a) having a melt penetration distance: 4.65 mm shown in Table 1 and Australian pisolite ore P (a) having a melt penetration distance: 1.12 mm.
  • A): B (a) 15: 85
  • the mixture was selectively charged in part A, and the remaining iron-containing raw material was charged in part B.
  • Example 4 the Brazilian ore B (a) having a melt penetration distance: 4.65 mm shown in Table 1 and the scale S1 generated in the iron making process having a melt penetration distance: 4.21 mm are mixed with a mixing ratio B (a ): S is an example in which the mixture is mixed so that 85:15 and is selectively charged in part A, and the remaining iron-containing raw material is charged in part B.
  • melt penetration distance of a mixture of B (a) and S1 iron ore selectively charged in part A of Example 4 (weighted average value by mixing ratio of each melt penetration distance between B (a) and S1 ) was 4.28 mm. Therefore, the product yield and strength SI of the sintered ore were improved and the production rate was improved as compared with Reference Example 1 without impairing the reduction-resistant powdered RDI and the reduction rate JIS-RI. Further, the melt penetration distance of the mixture of B (a) and S2 iron ore selectively charged in part A of Example 5 (weighting by the mixing ratio of the melt penetration distances of B (a) and S2) The average value) was 4.28 mm. Therefore, the product yield and strength SI of the sintered ore were improved and the production rate was improved as compared with Reference Example 1 without impairing the reduction-resistant powdered RDI and the reduction rate JIS-RI.
  • the melt penetration distance (B (b) and P (b) of each melt penetration distance of the iron ore mixture of B (b) and P (b) selectively charged in part A of Comparative Example 1 The weighted average value by the mixing ratio) was as low as 2.87 mm. Therefore, compared with the reference example 1, the product yield and intensity
  • Comparative Example 2 is a method of selectively charging Australian Pisolite ore P (a) having a melt penetration distance: 1.12 mm shown in Table 1 into part A and charging the remaining iron-containing raw material into part B. This is an example.
  • the melt permeability to the fine powder portion of each brand of iron ore to be blended with the sintering raw material is evaluated. Based on this evaluation result, among each brand iron ore, select a brand iron ore with excellent melt penetration into the fine powder part, and selectively insert it into the upper layer of the raw material packed bed, The product yield and strength of the upper layer of the raw material packed bed can be improved, and the productivity of the sintered ore can be improved. Therefore, the present invention has high applicability in the steel industry.
  • First surge hopper for other iron-containing raw materials
  • Second surge hopper for high melt-permeable iron-containing raw materials
  • Sintered raw materials consisting of other iron-containing raw materials, auxiliary raw materials, coke and return ore
  • Sintering pallet 5
  • Lower layer of raw material packed bed High melt permeable iron-containing raw materials, auxiliary raw materials, coke and returned ores
  • Sintered raw material consisting of 7

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Abstract

L'invention concerne un procédé de fabrication de minerais frittés selon lequel: un matériau de départ de chalybéate contenant plusieurs variétés de minerais de fer, des matériaux auxiliaires, un combustible solide et du minerai retourné sont mélangés pour constituer un matériau de départ de frittage, qui est mis en boulettes, chargé sur une palette de frittage, puis fritté. Les minerais de fer de forte perméabilité à l'état fondu, choisis dans les différentes variétés ou mélanges de minerais pour que la moyenne pondérée de la distance de perméabilité à l'état fondu soit 4,0 mm ou plus basée sur la distance de perméabilité à l'état fondu mesurée pour chacune des variétés du minerai de fer, sont chargés dans la couche supérieure, dont l'épaisseur est de 5 à 12 % de l'épaisseur de la couche totale mesurée depuis la surface supérieure du matériau de départ de la couche de remplissage formée sur la palette de frittage. D'autres minerais de fer sont chargés dans la couche inférieure de la couche de remplissage de matériau de départ, tandis que les matériaux auxiliaires, le combustible solide et le minerai retourné sont chargés dans couche supérieure et dans la couche inférieure de la couche de remplissage de matériau de départ
PCT/JP2009/004679 2008-09-17 2009-09-17 Procédé de fabrication de minerais frittés WO2010032466A1 (fr)

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JP2010504356A JP4528362B2 (ja) 2008-09-17 2009-09-17 焼結鉱の製造方法
CN2009801361127A CN102159733B (zh) 2008-09-17 2009-09-17 烧结矿的制造方法
BRPI0918512-7A BRPI0918512B1 (pt) 2008-09-17 2009-09-17 Method of production of sintered ore
KR1020117005893A KR101204525B1 (ko) 2008-09-17 2009-09-17 소결광의 제조 방법

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
JP2012021213A (ja) * 2010-07-16 2012-02-02 Nippon Steel Corp 焼結鉱の製造方法

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CN103215442B (zh) * 2013-04-27 2014-07-02 河北钢铁股份有限公司邯郸分公司 厚料层烧结料面喷洒覆盖剂及喷洒方法
KR102043781B1 (ko) * 2017-12-26 2019-12-02 주식회사 포스코 소결광 제조 방법 및 소결광 제조 장치
CN118019864A (zh) * 2021-09-29 2024-05-10 日本制铁株式会社 炼铁方法

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JPS6047887B2 (ja) * 1982-03-06 1985-10-24 新日本製鐵株式会社 焼結鉱製造方法
JPS62130229A (ja) * 1985-12-02 1987-06-12 Sumitomo Metal Ind Ltd 焼結操業方法
JPS62130227A (ja) * 1985-12-03 1987-06-12 Kawasaki Steel Corp 粉鉱石の焼結方法
JPH01240627A (ja) * 1988-03-23 1989-09-26 Kawasaki Steel Corp 粉鉄鉱石の焼結方法
JPH06346159A (ja) * 1993-06-07 1994-12-20 Kawasaki Steel Corp 焼結鉱の製造方法
JP2002062290A (ja) * 2000-08-21 2002-02-28 Nippon Steel Corp 鉄鉱石粉の評価方法
JP2006097083A (ja) * 2004-09-29 2006-04-13 Nippon Steel Corp 焼結用原料の評価方法および配合設計方法

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KR100308830B1 (ko) 1997-07-18 2002-04-17 이구택 소결광 회수율 향상을 위한 소결광 제조방법
KR100504365B1 (ko) 2000-08-19 2005-07-29 주식회사 포스코 고결정수 철광석 배합시의 소결광 제조방법

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Publication number Priority date Publication date Assignee Title
JPS6047887B2 (ja) * 1982-03-06 1985-10-24 新日本製鐵株式会社 焼結鉱製造方法
JPS62130229A (ja) * 1985-12-02 1987-06-12 Sumitomo Metal Ind Ltd 焼結操業方法
JPS62130227A (ja) * 1985-12-03 1987-06-12 Kawasaki Steel Corp 粉鉱石の焼結方法
JPH01240627A (ja) * 1988-03-23 1989-09-26 Kawasaki Steel Corp 粉鉄鉱石の焼結方法
JPH06346159A (ja) * 1993-06-07 1994-12-20 Kawasaki Steel Corp 焼結鉱の製造方法
JP2002062290A (ja) * 2000-08-21 2002-02-28 Nippon Steel Corp 鉄鉱石粉の評価方法
JP2006097083A (ja) * 2004-09-29 2006-04-13 Nippon Steel Corp 焼結用原料の評価方法および配合設計方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012021213A (ja) * 2010-07-16 2012-02-02 Nippon Steel Corp 焼結鉱の製造方法

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JPWO2010032466A1 (ja) 2012-02-09
BRPI0918512A2 (pt) 2015-12-01
CN102159733A (zh) 2011-08-17
BRPI0918512B1 (pt) 2017-11-21

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