WO2012015066A1 - Procédé de production d'une matière première pour frittage - Google Patents

Procédé de production d'une matière première pour frittage Download PDF

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Publication number
WO2012015066A1
WO2012015066A1 PCT/JP2011/067723 JP2011067723W WO2012015066A1 WO 2012015066 A1 WO2012015066 A1 WO 2012015066A1 JP 2011067723 W JP2011067723 W JP 2011067723W WO 2012015066 A1 WO2012015066 A1 WO 2012015066A1
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Prior art keywords
raw material
limestone
sintering
powder
solid fuel
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PCT/JP2011/067723
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English (en)
Japanese (ja)
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隆英 樋口
大山　伸幸
直幸 竹内
主代　晃一
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Ｊｆｅスチール株式会社
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Priority to CN201180037558.1A priority Critical patent/CN103038369B/zh
Publication of WO2012015066A1 publication Critical patent/WO2012015066A1/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
    • 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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates

Definitions

  • the present invention relates to a method for producing a raw material for sintering used when producing a sintered ore using a downward suction type dweroid type sintering machine.
  • the sintered ore charged into the blast furnace is generally manufactured through the following treatment.
  • raw materials roughly divided into the following (a) to (d) are charged into a drum mixer, mixed with an appropriate amount of water, and granulated to produce a granular sintering raw material.
  • the sintering raw material composed of the granulated particles obtained by mixing and granulating the materials (a) to (d) described above has a predetermined thickness (usually 500 to 700 mm) on the pallet of a dwy-toroid type sintering machine. Are stacked in layers.
  • the solid fuel powder material distributed in the upper part of the sintering raw material layer loaded on the pallet is ignited, and after ignition, the solid fuel powder material is burned while sucking air downward.
  • the raw material for sintering is sintered with combustion heat to form a sintered cake.
  • hematite contained in iron ore reacts with limestone powder raw material and CaO contained in iron ore to produce calcium ferrite melt (hereinafter referred to as CF melt), which CF melt is used for sintering. Contributes to the combination of raw materials.
  • the sintered cake is crushed and sized to become a sintered ore having a predetermined particle size.
  • the sintered ore that does not satisfy the predetermined particle size is returned to ore and reused as a sintering raw material.
  • Patent Document 1 is charged with (a) iron ore, (b) SiO 2 -containing material, and (c) limestone-based powder material from the inlet of the drum mixer, except for the solid fuel-based powder material. Then, a technique is disclosed in which the solid fuel powder raw material is added at a position where the residence time until the granulated particles (hereinafter referred to as pseudo particles) reach the discharge port is 10 to 120 seconds. . In the raw material for sintering obtained by this technique, the solid fuel-based powder raw material can be attached to the surface of the pseudo particles obtained by granulating the iron ore, the SiO 2 -containing raw material, and the limestone-based powder raw material.
  • pseudo particles granulated particles
  • the solid fuel-based powder raw material is not taken into the pseudo-particles and burns in the surface of the pseudo-particles, so that the flammability is greatly improved, and the solid fuel-based powder raw materials such as powder coke and anthracite Therefore, it is possible to increase the pseudo particle size by granulating except this.
  • Patent Document 2 the above-mentioned (a) iron ore and (b) SiO 2 -containing raw material are charged and granulated from the inlet of the drum mixer, and the pseudo particles after granulation are discharged.
  • a technique is disclosed in which (c) a limestone powder raw material and (d) a solid fuel powder raw material are added to pseudo particles at a position where the residence time until reaching the outlet is 10 to 90 seconds. .
  • the limestone powder raw material and the solid fuel powder raw material are attached to the surface of the pseudo particles made of iron ore and the SiO 2 -containing raw material. Therefore, when such a raw material for sintering is sintered, a CF melt is selectively generated on the surface of the raw material for sintering, and the formation of calcium silicate is suppressed.
  • the coke cooling method at the time of coke production includes a wet type and a dry type (referred to as CDQ). Due to the characteristics of the apparatus, a considerable amount of fine coke is generated when any apparatus is used. The fine coke has been piled up for a long time. However, it is desirable to use such fine coke from the viewpoint of effective use of resources.
  • Patent Document 3 proposes a technique of using finely ground coke generated in the coke production process as a fuel for producing sintered ore, which is an iron source charged in a blast furnace. That is, in order to produce a sintered ore, powdery coke as a heat source is mixed with powdered iron ore, limestone, etc., and agglomerated by the combustion heat of the coke.
  • the above-mentioned patent document 3 kneads fine powder raw materials such as converter dust, sintered dust and water in fine powder coke recovered by CDQ at an appropriate ratio, and is a fuel for manufacturing sintered ore (hereinafter referred to as a sintering fuel). ) As a preferred particle size. As a result, it was expected that fine coke in a dry state could be reused while suppressing generation of dust.
  • the sintering fuel produced as described above has low strength as individual particles, it collapses when mixed with other sintering materials by a drum mixer, and the sintering materials are sintered.
  • a packed bed is formed on the machine pallet, fine coke is mixed and unevenly distributed in the packed bed. Therefore, when the so-called “sintering operation” is performed by igniting in this state, there is a problem that uneven burning occurs in the sintering machine and a preferable operation cannot be performed.
  • Patent Document 6 (a) iron ore and (b) SiO 2 -containing raw material are charged from a charging port of a drum mixer and granulated.
  • Disclosed is a technology that, when adding a limestone powder raw material and (d) a solid fuel powder raw material, the amount of coke powder mixed in (a) iron ore and (b) SiO 2 containing raw material is kept to 1.5 mass% or less. Has been. In this way, conventionally, finely ground coke is stopped using or the amount of mixing is stopped to 1.5 mass% or less, and the remaining portion is reused by being mixed into raw coal as waste. It was.
  • Japanese Patent No. 3794332 Japanese Patent No. 3755452 JP 61-291926 A JP 2000-169915 A JP 2000-96154 A Japanese Patent No. 39951825
  • the present invention relates to the improvement of the technology disclosed in Patent Documents 1 and 2 listed above.
  • the strength of the granulated product is improved, and consequently, for sintering.
  • the aim is to improve the productivity of raw materials.
  • the present invention enables reuse of finely ground coke, which was previously a waste due to uneven burning in a sintering machine, as a solid fuel-based powder material (condensation material) during sinter production. It is something that has been conditioned.
  • the present invention performs a process of attaching a limestone powder raw material and a solid fuel powder raw material (hereinafter referred to as an exterior treatment) to the surface of a pseudo particle that is a granulated product composed of iron ore and a SiO 2 -containing raw material. It is an object of the present invention to provide an advantageous method for producing a raw material for sintering, which can improve productivity, contrary to conventional knowledge, by effectively utilizing ultrafine limestone and also finely pulverized coke.
  • the present inventors have performed productivity when performing so-called exterior treatment in which a limestone-based powder material and a solid fuel-based powder material are attached to the surface of a pseudo particle that is a granulated product made of iron ore and a SiO 2 -containing material.
  • a pseudo particle that is a granulated product made of iron ore and a SiO 2 -containing material.
  • the formation of CF melt at the time of granulation is promoted, the strength of the outer shell layer is improved, and the air permeability at the time of sintering is improved. It has been newly found that the productivity of the raw material for sintering is improved.
  • the present inventors use high carbon dust such as fine coke generated in CDQ or the like in combination with a solid fuel-based powder raw material represented by conventional powder coke, anthracite, etc. at an appropriate ratio. It was found that if it was made to adhere to the surface, the combustibility and granulation strength were greatly improved, and as a result, the productivity of the raw material for sintering was improved.
  • the present invention in addition to the fine powder coke generated in the above-described CDQ and the like, it was investigated that fine powder having a C concentration of 50 mass% or more can be used, and these are collectively referred to as high carbon dust. . The present invention has been made based on these findings.
  • the gist configuration of the present invention is as follows. (1) Prepare a sintering raw material consisting of iron ore, SiO 2 containing raw material, limestone powder raw material and solid fuel powder raw material, The iron ore and the SiO 2 -containing raw material are charged from the drum mixer inlet and granulated to form pseudo particles, A solid fuel powder raw material and a limestone powder raw material are added to the pseudo particles, and the solid fuel powder raw material and the limestone powder raw material are put on the surface of the pseudo particles while reaching the discharge port of the drum mixer. Attach The limestone powder raw material contains 5 to 40 mass% of ultrafine limestone, A method for producing a raw material for sintering.
  • the high carbon dust is at least one selected from the group consisting of CDQ dust collection powder, dust collection powder during iron powder production, and dust collection powder in a storage tank, and the C concentration is 50 mass% or more.
  • the manufacturing method of the raw material for sintering as described in (1) which is adjusted.
  • (11) The method for producing a sintering raw material according to (1), wherein the solid fuel-based powder raw material has an average particle diameter of 250 ⁇ m to 2.5 mm.
  • the production of CF melt during granulation is promoted, the strength of the outer shell layer is improved, and the air permeability during sintering is improved.
  • the productivity of the raw material for sintering can be improved.
  • the high carbon dust is packaged on the surface of the quasiparticle, so the quasiparticle diameter Can be kept large, and because it is not housed in the pseudo-particles, the combustibility is improved.
  • the pseudo particle diameter can be increased, the exterior time on the surface of the pseudo particle can be shortened, and the state of being embedded can be avoided. Furthermore, since the surface of the pseudo particle can be coated with a solid fuel powder material using high carbon dust and a limestone powder material using ultrafine limestone in combination, the formation of CF melt is promoted, and the strength calcium is weak.
  • Silicate generation is suppressed.
  • the C concentration is 50 mass% or more, it can be used as a coagulating material for sintering. Even if the C concentration is less than 50 mass%, other fine powder having a C concentration of 50 mass% or more can be used. If it is mixed and the C concentration is adjusted to 50 mass% or more, it can be used.
  • FIG. 1 It is a schematic diagram which shows another example of the manufacturing apparatus of a suitable raw material for sintering used when manufacturing a raw material for sintering by applying this invention. It is a figure which shows the relationship between the compounding rate of the ultrafine limestone in the pseudo
  • FIG. 6A is an image view of a cross section of a pseudo particle in which high carbon dust is embedded according to a conventional method
  • FIG. 6B is an enlarged view of the surface layer portion.
  • FIG. 7 (a) is an image view of a cross section of a pseudo particle covering powdered limestone containing ultrafine limestone and powdered coke containing high carbon dust according to the present invention
  • FIG. 7 (b) is an enlarged view of the surface layer portion. . It is the figure which compared and showed the result investigated about sintering time, yield, and productivity when each raw material for sintering (Invention example 2, 3 and comparative example 3) was sintered.
  • FIG. 1 schematically shows an example of an apparatus for producing a sintering raw material suitable for use in the production of a sintering raw material by applying the present invention.
  • reference numeral 1 is a drum mixer
  • 2 is iron ore
  • 3 is a SiO 2 -containing raw material
  • 4 is a limestone powder raw material
  • 5 is a solid fuel powder raw material
  • 6 is a sintering raw material.
  • the manufacturing process of the raw material for sintering shown in FIG. 1 will be described more specifically.
  • the iron ore 2 and the SiO 2 -containing raw material 3 are charged into the drum mixer 1 from the charging port and granulated.
  • the pseudo particles made of the iron ore 2 and the SiO 2 -containing raw material 3 granulated in the drum mixer 1 move to the discharge port.
  • the limestone-based powder raw material 4 and the solid fuel-based powder raw material 5 are placed at a position set in the middle of the downstream side where the residence time (that is, the exterior time) until the pseudo particles reach the discharge port is in the range of 10 to 50 seconds. Added.
  • the position of the tip of a belt conveyor or a screw conveyor arranged so as to be able to advance and retreat in the longitudinal direction in the drum mixer 1 from the downstream discharge port is adjusted to adjust the limestone powder raw material 4 and the solid fuel system.
  • the exterior time can be maintained within a predetermined range.
  • An appropriate amount of water may be added as necessary.
  • the limestone powder raw material 4 and the solid fuel powder raw material 5 are uniformly coated on the surface of the pseudo particles until the pseudo particles reach the discharge port.
  • the average particle diameter of the limestone powder raw material 4 and the solid fuel powder raw material 5 used for the exterior treatment is both about 250 ⁇ m to 2.0 mm.
  • the average particle size of the limestone powder raw material and the solid fuel powder raw material that have been used in the past is relatively large, and it is not always possible to form a strong outer shell layer of the solid fuel powder raw material. could not. Also, the combustion rate was not sufficiently satisfactory.
  • the inventors have conducted various studies to solve this problem, and as a result, when an appropriate amount of ultrafine limestone is mixed in the limestone powder raw material, the ultrafine limestone is formed in the limestone voids having a relatively large particle size. It has been found that a strong limestone-based powder raw material layer is formed during granulation effectively. Similarly, if high carbon dust, which has been forgotten to be used in the past, is mixed at an appropriate ratio, fine high carbon dust penetrates into the voids of the carbon raw material having a relatively large particle size, It has been found that a solid solid fuel-based powder raw material layer is formed. As a result, it was found that a strong outer shell layer in which limestone powder raw material and solid fuel powder raw material were mixed was formed, and as a result, combustibility and granulation strength were greatly improved, and productivity was remarkably improved.
  • FIG. 2 shows the results of examining the influence on the granulation strength and combustion melting zone pressure loss of quasi particles coated with pulverized limestone and powdered coke in combination with ultrafine limestone according to the present invention. Shown in relation to rate.
  • the ultrafine limestone fine powder with a sieve size of 50 ⁇ m was used.
  • the total amount of limestone in the pseudo particles was set to a constant value of 10 mass%.
  • the granulation strength increases and the combustion melting zone pressure loss decreases as the mixing ratio of the ultrafine limestone increases.
  • the blending ratio of ultrafine limestone exceeds 4 mass% (combination ratio with respect to total limestone: 40 mass%), an overmelted state occurs and combustion melting zone pressure loss starts to increase.
  • the blending ratio (combination ratio) of ultrafine limestone in the limestone powder raw material is limited to a range of 5 to 40 mass%. This is because, in the limestone powder raw material, if the blending ratio of ultrafine limestone is less than 5 mass%, the desired effect of strengthening the outer shell layer cannot be obtained, whereas if it exceeds 40 mass%, it becomes an overmelted state and burns. This is because the pressure loss in the melting zone increases.
  • FIG. 3 shows the results of examining the relationship between the particle size of the powder coke and the combustion zone moving speed (hereinafter simply referred to as the combustion speed).
  • the combustion speed the combustion zone moving speed
  • the smaller the particle size of the powder coke the greater the specific surface area of the powder coke and the higher the ambient temperature, so the combustion rate increases. Therefore, an improvement in the combustion rate can be expected by using such ultrafine powder and highly reactive carbon material (high carbon dust) in an appropriate ratio.
  • FIG. 4 shows the results of examining the granulation strength and the sintering strength of the pseudo particles when high carbon dust is housed inside the pseudo particles.
  • the granulation strength and sintering strength were estimated based on the following estimation formulas (Equation 1 and Equation 2).
  • ⁇ strength of pseudo particles (N), ⁇ : degree of liquid fullness ( ⁇ ), S: powder surface area (m 2 ), ⁇ : porosity of pseudo particles ( ⁇ ), ⁇ : surface of water Tension (N / m), ⁇ : contact angle with water (°), d: pseudo particle size (m)
  • ⁇ t tensile strength (MPa)
  • ⁇ 0 substrate strength (MPa)
  • P porosity ( ⁇ )
  • c constant ( ⁇ )
  • the present invention when ultrafine limestone and high carbon dust were packaged, the granulation strength of the pseudo particles was greatly improved because the hydrophobic carbonaceous material was packaged. This is probably because the wettability was greatly improved.
  • the present invention when the present invention is followed, the sintering strength of the pseudo particles is also greatly improved. This reason is considered to be caused by a decrease in the porosity. That is, according to the present invention, when a suitable amount of ultrafine limestone and high carbon dust are used in combination, fine powdered limestone and high carbon dust enter the voids of normal powdered limestone and powder coke, and as a result, after carbon firing This is considered to be due to the suppression of the generation of the generated voids (breaking origin).
  • FIG. 5 the combustion of the pseudo particles in which powdered limestone combined with ultrafine limestone and powdered coke combined with high carbon dust are packaged and the pseudo particles embedded with high carbon dust according to the conventional method
  • the result of examining the speed is shown in relation to the blending ratio of high carbon dust (ultrafine carbonaceous material) in the pseudo particles.
  • the total amount of limestone in the pseudo particles was constant at 10 mass%, and the total amount of carbon (solid fuel powder raw material) was constant at 5 mass%.
  • the combustion rate rather decreased as the blending ratio of high carbon dust increased.
  • the combustion rate is greatly increased as the blending ratio of the high carbon dust is increased.
  • the compounding ratio of the high carbon dust in the pseudo particles (total carbon amount: 5 mass%) is 0.25 mass% or more, that is, the compounding ratio of the high carbon dust in the total carbon (solid fuel powder raw material).
  • the improvement of a combustion rate is remarkable.
  • the blending ratio of high carbon dust out of all carbon (solid fuel powder raw material) exceeds 40 mass%, the width of the combustion melting zone is expanded, resulting in an adverse effect of increasing the pressure loss in the sintered layer.
  • the blending ratio (combination ratio) of the high carbon dust in the solid fuel powder material is preferably in the range of 5 to 40 mass%. This is because if the blending ratio of the high carbon dust is less than 5 mass% in the solid fuel-based powder raw material, it cannot be said that the improvement in combustibility and granulation strength is sufficient. This is because an adverse effect of increasing the pressure loss in the sintered layer occurs.
  • the ultrafine limestone is preferably 50 ⁇ m or less in size. This is because, when the size of the ultrafine limestone exceeds 50 ⁇ m, it does not close-pack with the limestone to be packaged, and the coverage on the particle surface tends to decrease.
  • the preferred lower limit of the size of the ultrafine limestone is 10 ⁇ m.
  • the size of the ultrafine limestone is defined as the equivalent circle diameter when the ultrafine limestone is spherical, and as the sieve diameter when it is non-spherical.
  • ultrafine limestone as shown in Table 1 can be used.
  • the high carbon dust preferably has a size of 50 ⁇ m or less and a C concentration of 50 mass% or more. This is because when the size of the high carbon dust exceeds 50 ⁇ m, the powder coke is not closely packed with the powdered coke, and the coverage on the particle surface tends to decrease.
  • size of high carbon dust is 10 micrometers.
  • the high carbon dust C concentration is less than 50 mass%, the combustion heat is small, and the coexistence of slag components and ash causes a disadvantage that the combustibility of the powder coke is hindered.
  • the definition of the size of the high carbon dust is the same as in the case of ultrafine limestone.
  • the high carbon dust is at least one selected from the group consisting of CDQ dust collection powder, dust collection powder during iron powder production, and dust collection powder in a storage tank, and the C concentration is adjusted to 50 mass% or more. It is preferable that Table 2 shows examples of components of CDQ dust collection powder, dust collection powder during production of iron powder, and dust collection powder in the storage tank.
  • FIG. 6 (a) and FIG. 7 (a) show, according to the conventional method, pseudo particles with ultra fine powder / high reactivity carbon material (high carbon dust) and super fine powder / high reactivity carbon material (high The image of the cross section of the pseudo
  • the pseudo particles according to the conventional method are interspersed with high carbon dust, whereas the pseudo particles according to the present invention are super Fine limestone and high carbon dust are present in the outer layer of the granulated particles in a form that penetrates into the gap between the powdered limestone and powder roux.
  • the granulation strength and the sintering strength can be improved, the combustion rate can be increased, and the outer granulation time can be shortened.
  • the productivity is remarkably improved.
  • An improvement is achieved. That is, the addition of an appropriate amount of ultrafine limestone promotes the formation of CF melt during granulation and suppresses the formation of weak calcium silicate, resulting in improved strength of pseudo particles and aeration during sintering. As a result, the productivity of the raw material for sintering is improved.
  • the addition of high carbon dust greatly improves the wettability by covering the hydrophobic carbonaceous material, resulting in a marked improvement in granulation strength, and in the fine pores of ordinary powder coke.
  • the intrusion of high carbon dust the generation of voids (breaking origin) after carbon firing is suppressed, the sintering strength of the pseudo particles is remarkably improved, and the exterior granulation time of the pseudo particles is about It can be shortened to about 1/2.
  • a conveying device for example, a belt conveyor, a screw conveyor, etc.
  • a belt conveyor increases the frequency of failure of a motor or a roller that supplies driving force to the belt. Therefore, it is possible to feed the limestone powder raw material 4 and the solid fuel powder raw material 5 from the outside of the discharge port without inserting a belt conveyor into the drum mixer 1 and increasing the conveying speed.
  • the screw conveyor does not need to be equipped with a large number of rollers and has a simple structure. Therefore, even if it is inserted into the drum mixer 1, it can hardly be broken and can be operated stably. If the screw conveyor is inserted into the drum mixer 1, the tip position can be adjusted and the limestone powder raw material 4 and the solid fuel powder raw material 5 can be added to predetermined positions. In that case, since the impact is relaxed (only the impact of natural fall), the collapse of the pseudo particles can be prevented. Moreover, collapse of the limestone powder raw material 4 and the solid fuel powder raw material 5 can be prevented, and the particle diameter adjusted in advance can be maintained. Accordingly, it is preferable to use a screw conveyor as the conveying means.
  • the average particle diameter of the limestone powder raw material 4 used for the exterior treatment is preferably 250 ⁇ m to 5.0 mm, and the average particle diameter of the solid fuel powder raw material 5 is preferably 250 ⁇ m to 2.5 mm.
  • the average particle diameter of the limestone powder raw material 4 exceeds 5.0 mm and the average particle diameter of the solid fuel powder raw material 5 exceeds 2.5 mm, the coarse particles of the limestone powder raw material 4 and the solid fuel powder raw material 5 Therefore, it becomes difficult to uniformly coat the surface of the pseudo particle in a short time.
  • the average particle size is less than 250 ⁇ m, the fine particles of the limestone powder raw material 4 and the solid fuel powder raw material 5 increase and intrude through gaps that inevitably exist in the pseudo particles, and also enter the limestone powder.
  • the raw material 4 and the solid fuel-based powder raw material 5 are mixed into the sintering raw material.
  • the blending ratios of the solid fuel powder raw material and the limestone powder raw material with respect to the entire sintering raw material are respectively 3.0 to 6.0 mass% for the solid fuel powder raw material and 6.0 to 12% for the limestone powder raw material. It is preferable to set it to about 0 mass%. More preferably, they are in the range of solid fuel powder raw material: 3.5 to 5.0 mass%, limestone powder raw material: 6.5 to 10.0 mass%.
  • the exterior time is preferably about 10 to 50 seconds. More preferably, it is in the range of 20 to 40 seconds.
  • Example 1 As shown in FIG. 1, the iron ore 2 and the SiO 2 -containing raw material 3 were charged into the drum mixer 1 from the charging port and granulated. In addition, as the SiO 2 -containing raw material 3, silica stone or nickel slag was used. In the drum mixer 1, the iron ore 2 and the SiO 2 -containing raw material 3 are granulated into pseudo particles, and the limestone is at a position where the residence time until the pseudo particles reach the discharge port of the drum mixer 1 is 40 seconds.
  • the specific addition method adjusts the front-end
  • the limestone powder raw material 4 and the solid fuel powder raw material 5 were added to the position. Therefore, the exterior time is 40 seconds. This is referred to as Invention Example 1.
  • Comparative Example 1 As invention Example 1, the iron ore 2 and the SiO 2 -containing raw material 3 are charged into the drum mixer 1 from the charging port and granulated, and the pseudo particles reach the discharge port of the drum mixer 1.
  • the limestone powder raw material 4 In the position where the residence time is 80 seconds, the limestone powder raw material 4 has a particle size: 1.2 mm limestone: 10 mass% and the solid fuel powder raw material 5 has a particle diameter: 0.9 mm powder coke: 5 mass%. Added. Therefore, the exterior time is 80 seconds.
  • Comparative Example 2 a raw material for sintering was manufactured under the same conditions as Comparative Example 1 except that the exterior time was 40 seconds.
  • the exterior time can be shortened, and further, the sintered raw material having sufficient strength can be obtained by sintering the raw material for sintering.
  • Example 2 In the same manner as in Example 1, various raw materials for sintering shown in Table 1 (Invention Examples 2, 3 and Comparative Example 3) were produced. Table 3 shows the mixing ratio of the raw materials in each sintering raw material. Invention Example 2 uses 20 mass% of ultrafine limestone with respect to total limestone, and Invention Example 3 uses 20 mass% of ultrafine limestone with respect to total limestone and 20 mass% of high carbon dust with respect to all coke. % When used together. The exterior time was 40 seconds for Invention Examples 2 and 3, and 80 seconds for Comparative Example 3. FIG. 8 shows a comparison of the results of examining the sintering time, yield, and productivity when the sintering raw materials thus obtained were sintered.
  • Invention Examples 2 and 3 both had a shorter sintering time, a higher yield, and higher productivity than Comparative Example 3.
  • Invention Example 3 utilizing ultrafine limestone and high carbon dust was superior in all aspects of sintering time, yield and productivity as compared to Invention Example 2 utilizing only ultrafine limestone.

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Abstract

L'invention concerne un procédé avantageux de production d'une matière première pour frittage dont la productivité peut être améliorée par rapport aux procédés classiques en utilisant efficacement de la poudre de calcaire ultrafine et de la poussière à forte teneur en carbone dans un procédé dans lequel la surface de pseudo-particules est recouverte avec une matière première en poudre à base de calcaire et une matière première en poudre à base de combustible solide. Ledit procédé consiste à recouvrir la surface de pseudo-particules avec une matière première en poudre à base de calcaire et une matière première en poudre à base de combustible solide. La matière première en poudre à base de calcaire utilisée contient 5 à 40 % en masse de particules de calcaire ultrafines, et la matière première en poudre à base de combustible solide utilisée contient 5 à 40 % en masse de poussière à forte teneur en carbone.
PCT/JP2011/067723 2010-07-30 2011-07-27 Procédé de production d'une matière première pour frittage WO2012015066A1 (fr)

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CN103451418B (zh) * 2013-09-07 2015-11-18 鞍钢股份有限公司 一种烧结矿的生产方法
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