WO2019188668A1 - 造粒物、造粒物の製造方法および焼結鉱の製造方法 - Google Patents
造粒物、造粒物の製造方法および焼結鉱の製造方法 Download PDFInfo
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- WO2019188668A1 WO2019188668A1 PCT/JP2019/011724 JP2019011724W WO2019188668A1 WO 2019188668 A1 WO2019188668 A1 WO 2019188668A1 JP 2019011724 W JP2019011724 W JP 2019011724W WO 2019188668 A1 WO2019188668 A1 WO 2019188668A1
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- Prior art keywords
- granulated
- mass
- sintered ore
- granulated product
- sludge
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims description 27
- 239000000126 substance Substances 0.000 title abstract 4
- 239000000843 powder Substances 0.000 claims abstract description 65
- 239000010802 sludge Substances 0.000 claims abstract description 59
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 43
- 239000000428 dust Substances 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 30
- 239000002994 raw material Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 229910052742 iron Inorganic materials 0.000 claims description 20
- 238000005469 granulation Methods 0.000 claims description 15
- 230000003179 granulation Effects 0.000 claims description 15
- 239000011361 granulated particle Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005245 sintering Methods 0.000 claims description 7
- 230000018044 dehydration Effects 0.000 claims description 3
- 238000006297 dehydration reaction Methods 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 description 36
- 239000008187 granular material Substances 0.000 description 30
- 238000011156 evaluation Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 8
- 238000009628 steelmaking Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000571 coke Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
- B01J2/10—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in stationary drums or troughs, provided with kneading or mixing appliances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
- C22B1/02—Roasting processes
-
- 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
-
- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
-
- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a granulated product containing sludge generated in an iron making process with improved conveyor transportability, a method for producing the granulated product, and a method for producing a sintered ore using the granulated product.
- a large amount of dust and sludge is generated in various iron making processes such as iron making, steel making and rolling. Since these dusts and sludge contain a large amount of iron and carbon, it is preferable not to discard them but to reuse them as iron sources and heat sources.
- dust and sludge are used in high temperature processes in ironmaking and steelmaking. Dust and sludge are remelted in a high-temperature process, are melted into the hot metal and reused as an iron source.
- Dust is a fine powder with an iron-containing moisture content of 0-20% by mass, and in many cases, a moisture content of 0-5% by mass.
- Sludge is a fine powder containing iron and having a moisture content of 20% by mass or more, and has a high moisture content and high adhesion. Therefore, when it is conveyed by a belt conveyor, it adheres to the conveyor junction and becomes clogged. .
- the fine powder has an average particle size of 0.5 mm or less, and the problem of adhesion and dust generation is particularly great.
- dust generation can be alleviated by providing a dust collection facility, but sludge adhesion is particularly problematic.
- Patent Document 1 discloses a cake-shaped iron sludge using a granulated material manufacturing apparatus including a stirring blade that revolves in a drum and a stirring rotor that revolves and rotates together with the stirring blade.
- a method for producing a granulated product that is crushed and granulated by adding a solidifying agent and iron-making dust is disclosed. It is disclosed that by using the above method, it is possible to appropriately granulate without performing a special drying treatment, and it is possible to granulate a granulated material suitably used in a high temperature process.
- Patent Document 2 discloses a granulation method of a sintered raw material in which powder coke and coarse particles are mixed with dust and sludge, granulated with a vibration kneading granulator, and further powder coke is granulated on the exterior coating. Yes.
- Patent Document 3 discloses a method of retaining sludge in the concave portion of the sintered ore by setting the water content of the mixture obtained by mixing fine-grained sintered ore to hydrous sludge to a range of 3 to 15%.
- Patent Document 1 since the granulated product disclosed in Patent Document 1 has a high moisture content, when the granulated product is conveyed by a belt conveyor, the amount of adhesion to the conveyor junction increases. In particular, belt conveyors are installed outdoors at steelworks, and when it rains, it also rains on the belt conveyor. For this reason, there was a problem in that the moisture content of the granulated material further increased during rainy weather and the amount of adhesion to the conveyor junction increased, and the adhesion of the granulated material occurred due to the adhesion.
- Patent Document 2 since the water content of sludge is not considered, there is a problem that it is not a method that can solve the adhesion of the granulated material during transportation. According to the method of Patent Document 3, transportation inhibition in the transportation process can be reduced by attaching the sludge to the sintered ore. However, since the method of Patent Document 3 does not include a granulating step, there is a restriction that the water content after mixing must be 3 to 15%. For this reason, when the mixing amount of the sludge is 30% by mass or more, a preferable result cannot be obtained, and there is a problem that the application range is narrow.
- the present invention has been made in view of such problems of the prior art, and an object thereof is to provide a granulated product that can reduce the amount of adhesion to a conveyor junction.
- the gist of the present invention for solving the above problems is as follows. (1) including a sludge greater than 30% by mass and 90% by mass or less and a sintered ore powder of 10% by mass or more and less than 70% by mass, including granulated particles having the sludge attached to the sintered ore powder, Granulated material. (2) The granulated product according to (1), wherein the granulated particles further contain dust. (3) The granulated product according to (1) or (2), wherein the water content of the sludge is 20% by mass or more and less than 30% by mass.
- a method for producing a granulated product comprising: a dehydrating step of dehydrating sludge to form a dehydrated cake; and a granulating step of mixing the dehydrated cake and sintered ore powder and granulating.
- a granulated product produced by the method for producing a granulated product according to any one of (4) to (6), an iron-containing raw material, a CaO-containing raw material, and a coagulant are blended.
- a blending step for forming a sintered raw material, a granulating step for adding water to the sintered raw material and granulating, and sintering the granulated sintered raw material with a sintering machine to obtain a sintered ore A method for producing sintered ore.
- the amount of the granulated material attached to the conveyor junction can be reduced. Thereby, generation
- FIG. 1 shows an enlarged cross-sectional photograph of the granulated product 10.
- FIG. 2 is an internal perspective view of the agitator 30 used for manufacturing the granulated product according to the present embodiment.
- FIG. 3 is a plan view of the agitator 30.
- FIG. 4 is a side view showing the adhesion evaluation apparatus 50.
- FIG. 5 is a graph showing the evaluation result of the adhesion amount.
- FIG. 6 is a graph showing the evaluation result of the adhesion amount.
- the granulated product according to the present embodiment includes a sludge generated in the iron making process in an amount of more than 30% by mass and 90% by mass or less, and a sintered ore powder in an amount of 10% by mass to less than 70% by mass. It is a granulated product that is granulated to contain granulated particles with sludge attached. This granulated material may contain dust generated in the iron making process.
- FIG. 1 is a cross-sectional enlarged photograph of the granulated product.
- Fig.1 (a) is a cross-sectional enlarged photograph of the conventional granulated product 10
- FIG.1 (b) is a cross-sectional enlarged photo of the granulated product 20 which concerns on this embodiment.
- the conventional granulated product 10 is a granulated product obtained by granulating a granulated raw material containing sludge generated in an iron making process with a drum granulator.
- the granulated product 20 according to the present embodiment is a granulated product obtained by granulating a granulated raw material containing sludge generated in an iron making process and sintered ore powder.
- a black portion was confirmed at the center of the conventional granulated product 10.
- This black portion is a void 12 formed by dropping the center of the granulated product 10 when the granulated product 10 is fixed with a resin for microscopic observation and then polished for cross-sectional observation. It is considered that there is a fragile portion containing a large amount of moisture at the center of the conventional granulated product 10, and this portion dropped off by polishing and a gap 12 was generated at the center of the granulated product.
- the granulated product 10 having such a fragile portion in the center is easily disintegrated by an impact at the time of conveying the belt conveyor, and fine powder is generated and moisture inside is released.
- the amount of the granulated product attached to the conveyor junction increases.
- the granulated product 20 includes granulated particles 22 attached to the sintered ore powder 24 so that the sludge 28 is covered.
- the sintered ore powder 24 has pores and has a low water content because it is cooled with gas from a high temperature in the process of producing the sintered ore. For this reason, when the granulated raw material containing the sintered ore powder 24 and the sludge 28 is granulated, the granulated particles 22 are granulated using the sintered ore powder 24 as a core, and the moisture of the sludge 28 is caused by the sintered ore powder 24.
- the granulated product 20 includes the granulated particles 22 that are less likely to produce fine powder and have a small amount of moisture release that causes adhesion, and thus is conveyed on a belt conveyor than the conventional granulated product 10. Less adherence to the conveyor junction at the time.
- the content ratio of the sintered ore powder 24 in the granulated product according to this embodiment needs to be 10% by mass or more.
- the granulated product 20 contains 10% by mass or more of the sintered ore powder 24, thereby reducing the amount of adhesion to the conveyor junction.
- the content ratio of the sintered ore powder 24 is more preferably 25% by mass or more, and further preferably 50% by mass or more. Up to 50% by mass, the amount of adhesion to the conveyor junction decreases as the content of the sintered ore powder 24 increases.
- the upper limit of the content ratio of the sintered ore powder 24 may be less than 70% by mass, but from the viewpoint of increasing the processing amount of the sludge 28,
- the content ratio is preferably 50% by mass or less.
- the content ratio of the sludge 28 in the granulated product according to the present embodiment corresponds to the content ratio of the sintered ore powder 24 and is greater than 30% by mass and equal to or less than 90% by mass.
- a dewatering step is performed by dewatering the sludge 28 generated in the iron making process using a compression-type dewatering device to form a dewatered cake.
- a granulation step of mixing and granulating the dehydrated cake and the sintered ore powder 24 with a stirrer is performed.
- the mass of the raw material supplied to the granulator is all the mass of the raw material containing moisture.
- dust generated in the iron making process may be added, and these may be mixed and granulated.
- the granulated material which concerns on this embodiment is manufactured.
- the compression-type dewatering device for example, a filter press or a vacuum filter can be used.
- the dehydrating apparatus is not limited to the compression type, and it is sufficient that the sludge can be dehydrated to a state where it can be supplied to the stirrer.
- the water content of the dewatered sludge is preferably about 20 to 40% by mass. More preferably, the dewatering of the sludge is strengthened so that the water content of the sludge (dehydrated cake) is 20% by mass or more and less than 30% by mass. Thereby, the processing efficiency and granulation property of sludge can be raised.
- Sludge used in the present embodiment is sludge generated in a steelmaking process, such as a steelmaking process, a steelmaking process, a rolling process, a plating process, or a pickling process.
- the sludge before dehydration has a high water content, and the water content is about 40 to 70% by mass.
- the granulated product according to the present embodiment may contain dust, and the dust used for the production of the granulated product is dust generated in a steelmaking process, such as a steelmaking process, a sintered manufacturing process, a steelmaking process, and the like. Dust is collected by a method such as dry dust collection, and has a low water content. The water content is about 0 to 20% by mass, and often about 0 to 5% by mass.
- the sintered ore powder used in the present embodiment is a sintered ore having a particle diameter of 5 mm or less, and is a manufacturing process or a conveying process of the sintered ore, and a charging process of charging the sintered ore into the blast furnace.
- Sintered ore powder sieved under a sieve with a sieve having an opening diameter of 5 mm. Since the sintered ore produced by sintering has a low water content, the water content is 0 mass% or more and 5 mass% or less.
- the particle diameter of the sintered ore powder is preferably 2 mm or more.
- the sintered ore powder having a particle size of 5 mm or less which is sieved under a sieve having an opening diameter of 5 mm, contains many particles having a particle size of 0.1 to 5 mm. It is not necessary to remove the following fine powder.
- the particle diameter of the sintered ore powder may be managed so that the average particle diameter of the sintered ore powder is 2 mm or more so that the sintered ore powder of a certain size is included.
- FIG. 2 is an internal perspective view of the agitator 30 used for manufacturing the granulated product according to this embodiment.
- FIG. 3 is a plan view of the agitator 30.
- the stirrer 30 finely pulverizes the dewatered cake from which the sludge 28 has been dewatered, mixes the sintered ore powder 24 with the finely crushed dewatered cake, and optionally adds dust and mixes them to produce them.
- a device for granulating is
- the stirrer 30 includes a cylindrical container 32 into which dehydrated cake and dust are charged, a stirring blade 34, and a weir 36.
- the weir 36 is preferably provided to scrape the granulated raw material, but may not be provided.
- the cylindrical container 32 includes a cylinder 38 and a circular bottom plate 40.
- the cylindrical container 32 is provided with an opening (not shown) for supplying and discharging dehydrated cake and dust.
- the bottom plate 40 is provided integrally with the cylinder 38, and the bottom plate 40 rotates with the cylinder 38 by receiving a driving force.
- the cylindrical container 32 may have a top plate that seals the upper side of the cylindrical container 32.
- the stirring blade 34 has a rotating shaft 42 and a plurality of stirring plates 44.
- the rotation shaft 42 is provided at a position eccentric from the center of the cylindrical container 32.
- the stirring blade 34 rotates by receiving a driving force from a driving unit (not shown) provided on the upper side of the cylindrical container 32.
- a driving unit not shown
- the rotation shaft 42 may be provided at the center of the cylindrical container 32.
- the stirring plate 44 is provided to project radially outward from the rotating shaft 42.
- the stirring plate 44 is provided in six directions at 60 ° intervals at two locations in the vertical direction on the rotating shaft 42.
- the vertical position and number of the stirring plates 44 may be appropriately changed according to the amount of dehydrated cake and dust filled in the cylindrical container 32.
- the bottom plate 40 rotates, for example, clockwise, and the stirring blade 34 rotates counterclockwise.
- the dehydrated cake charged into the cylindrical container 32 rotates clockwise along the direction of rotation of the bottom plate 40.
- the dehydrated cake rotated clockwise is crushed by colliding with the stirring blade 34 rotated counterclockwise.
- the rotation direction of the bottom plate 40 and the stirring blade 34 may be clockwise or counterclockwise.
- the rotation directions of the bottom plate 40 and the stirring blade 34 may be different from each other or the same.
- stirrer 30 may be used while being inclined with respect to the horizontal plane.
- the stirring blade 34 may be supported while being supported in the vertical direction, and only the cylindrical container 32 may be tilted with respect to the horizontal plane.
- the dehydrated cake is finely crushed and the crushed dehydrated cake and the sintered ore powder 24 are mixed.
- dehydration cake is efficiently absorbed by the sintered ore powder 24, and the granulated material 20 containing the granulated particle 22 which the sludge 28 adhered to the sintered ore powder 24 can be manufactured.
- Dust has less moisture than sludge, so adding dust often improves granulation. For this reason, when it is required to reuse the dust generated in the iron making process, it is preferable to granulate the dust together with sludge and sintered ore.
- the feature of having the stirring blade 34 is particularly preferable from the viewpoint of efficiently granulating the granulated product 20.
- the feature that the cylindrical container 32 and the stirring blade 34 rotate independently is also preferable from the viewpoint of efficiently granulating the granulated product 20.
- the feature that the rotation direction of the stirring blade 34 and the bottom plate 40 is opposite and the feature that the stirring blade 34 has a rotation axis at a position eccentric from the center of the bottom plate 40 also efficiently granulate the granulated product 20. It is preferable from the viewpoint of.
- the granulated product 20 according to this embodiment can be used for the production of sintered ore.
- the granulated product 20 according to the present embodiment is blended in a blending step of blending an iron-containing raw material, a CaO-containing raw material, and a coagulating material into a sintered raw material, and water is added in the granulating step.
- the sintered raw material is granulated, and the sintered raw material granulated in the sintering step is sintered with a sintering machine to produce a sintered ore.
- the granulated product 20 according to the present embodiment is blended in the latter half of the granulation step, and the outer layer of the granulated sintered raw material
- blend so that it may become the granulated material 20 which concerns on this embodiment.
- the granulated material 20 which concerns on this embodiment can be used for manufacture of a sintered ore, and can be reused as an iron source and a heat source in manufacture of a sintered ore.
- the granulated product according to this embodiment was produced using two different granulation methods.
- a granulated product was produced using an intensive mixer type R02 manufactured by Eirich and having the same configuration as the stirrer 30 shown in FIG.
- a granulated product was produced using a drum type granulator.
- a dehydrated cake having a water content of 25% by mass obtained by dehydrating sludge and a dust having a water content of 5% by mass were introduced into each apparatus so as to have a mass ratio of 4: 1.
- a predetermined amount of sintered ore powder having a water content of 1.5% by mass was added to produce a granulated product.
- the components of dust, sludge and sintered ore powder used in the test are shown in Table 1, and the production conditions of the granulated product are shown in Table 2.
- “T—Fe” in Table 1 is an abbreviation for total Fe, and indicates the mass ratio of iron atoms in dust or sludge. In Table 1, the total of each component of dust and sludge does not reach 100 because it includes other components such as CaO not listed in the table.
- the circumferential speed of the stirring blade in Table 2 is the circumferential speed of the blade tip, and the rotation speed of the container is opposite to that of the stirring blade and is the rotation speed per minute of the cylindrical container 32.
- FIG. 4 is a side view showing the adhesion evaluation apparatus 50.
- the adhesion evaluation apparatus 50 is an apparatus having a belt conveyor 52 and a chute 54 provided by simulating a conveyor junction.
- the adhesion amount of the granulated material is evaluated by using the adhesion evaluation apparatus 50 to put 8 kg of the granulated material from the position of the arrow 56, transport the granulated material by the belt conveyor 52, drop it on the chute 54, The adhesion amount adhering to 54 was measured.
- the input amount of the granulated material and the speed of the belt conveyor 52 were adjusted so that the conveying speed of the granulated material was 0.8 kg / sec.
- the amount of adhesion was evaluated by performing the same test four times and calculating the total amount.
- FIG. 5 is a graph showing the evaluation result of the adhesion amount.
- the horizontal axis represents the content ratio of sintered ore powder (mass% with respect to the total mass charged into the apparatus), and the vertical axis represents the adhesion amount (g) to the chute 54.
- a triangular plot shows the evaluation result of the adhesiveness of the granulated material manufactured using the intensive mixer.
- a circle plot shows the evaluation result of the adhesiveness of the granulated material manufactured using the drum type granulator.
- the content ratio of the sintered ore powder is set to 10% by mass, so that the chute 54 is more than the granulated product not including the sintered ore powder.
- the amount of adhesion to the surface has decreased.
- the adhesion amount to the chute 54 was smaller than that of the granulated product having the content ratio of the sintered ore powder of 10% by mass.
- the content of the sintered ore powder is preferably 10% by mass or more, more preferably 25% by mass or more, and further preferably 50% by mass or more. Thereby, the adhesion amount to the chute
- the content ratio of the sintered ore powder is set to 10% by mass, so that the chute 54 can be obtained rather than the granulated product not including the sintered ore powder.
- the adhesion amount of was reduced. Furthermore, by setting the content ratio of the sintered ore powder to 25% by mass, the adhesion amount to the chute 54 was smaller than that of the granulated product having the content ratio of the sintered ore powder of 10% by mass.
- the drum type granulator has lower stirring ability than the intensive mixer, the dehydrated cake cannot be crushed as much as the intensive mixer. For this reason, the granulated product produced using the drum type granulator is produced with a larger amount of granulated product having a fragile part containing more water in the center than the granulated product produced by the intensive mixer. Therefore, it is considered that the amount of adhesion to the chute 54 has increased.
- the sludge shown in Table 1 was dehydrated to have a moisture content of 25% by mass, dust having a moisture content of 5% by mass, sintered ore powder having a moisture content of 1.5% by mass, mass
- the mixture is put into an intensive mixer so that the ratio is 12: 3: 5 (sludge: 60% by mass, dust: 15% by mass, sintered ore powder: 25% by mass), and the number of rotations and rotation time are changed, and the granulated product.
- the adhesion of the granulated product thus produced was evaluated using the adhesion evaluation apparatus 50 shown in FIG. Also in this test, the adhesion amount was evaluated by performing the same test four times and using the total amount.
- FIG. 6 is a graph showing the evaluation result of the adhesion amount.
- the horizontal axis represents the rotation time (sec) of the stirring blade, that is, the granulation time
- the vertical axis represents the adhesion amount (g) to the chute 54.
- a circle plot shows the result of the granulated material manufactured by setting the peripheral speed of the tip of the stirring blade to 2.3 m / sec.
- a rhombus plot shows the result of the granulated material manufactured by setting the peripheral speed of the tip of the stirring blade to 4.7 m / sec.
- a triangular plot shows the result of the granulated material manufactured by making the peripheral speed of the front-end
- the rotation time is preferably 30 sec or more.
- the processing capacity of the stirrer is lowered.
- rotation time is 180 sec or less.
- the peripheral speed of the stirring blade is preferably 4.7 m / sec or more.
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Abstract
Description
(1)30質量%より多く90質量%以下のスラジと、10質量%以上70質量%未満の焼結鉱粉とを含み、前記焼結鉱粉に前記スラジが付着した造粒粒子を含む、造粒物。
(2)前記造粒粒子は、さらにダストを含む、(1)に記載の造粒物。
(3)前記スラジの水分含有量が20質量%以上30質量%未満である、(1)または(2)に記載の造粒物。
(4)スラジを脱水して脱水ケーキとする脱水工程と、前記脱水ケーキと、焼結鉱粉とを混合して造粒する造粒工程と、を有する、造粒物の製造方法。
(5)前記造粒工程では、さらにダストを混合する、(4)に記載の造粒物の製造方法。
(6)前記脱水ケーキの水分含有量が20質量%以上30質量%未満である、(4)または(5)に記載の造粒物の製造方法。
(7)(4)から(6)のいずれか1つに記載の造粒物の製造方法で製造された造粒物と、鉄含有原料と、CaO含有原料と、凝結材と、を配合して焼結原料にする配合工程と、前記焼結原料に水を添加して造粒する造粒工程と、造粒された前記焼結原料を焼結機で焼結して焼結鉱とする焼結工程と、を有する、焼結鉱の製造方法。
12 空隙
20 造粒物
22 造粒粒子
24 焼結鉱粉
28 スラジ
30 撹拌機
32 円筒容器
34 撹拌羽根
36 堰
38 円筒
40 底板
42 回転軸
44 撹拌板
50 付着性評価装置
52 ベルトコンベア
54 シュート
56 矢印
Claims (7)
- 30質量%より多く90質量%以下のスラジと、10質量%以上70質量%未満の焼結鉱粉とを含み、
前記焼結鉱粉に前記スラジが付着した造粒粒子を含む、造粒物。 - 前記造粒粒子は、さらにダストを含む、請求項1に記載の造粒物。
- 前記スラジの水分含有量が20質量%以上30質量%未満である、請求項1または請求項2に記載の造粒物。
- スラジを脱水して脱水ケーキとする脱水工程と、
前記脱水ケーキと、焼結鉱粉とを混合して造粒する造粒工程と、
を有する、造粒物の製造方法。 - 前記造粒工程では、さらにダストを混合する、請求項4に記載の造粒物の製造方法。
- 前記脱水ケーキの水分含有量が20質量%以上30質量%未満である、請求項4または請求項5に記載の造粒物の製造方法。
- 請求項4から請求項6のいずれか一項に記載の造粒物の製造方法で製造された造粒物と、鉄含有原料と、CaO含有原料と、凝結材と、を配合して焼結原料にする配合工程と、
前記焼結原料に水を添加して造粒する造粒工程と、
造粒された前記焼結原料を焼結機で焼結して焼結鉱とする焼結工程と、
を有する、焼結鉱の製造方法。
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JP2020510786A JP6973627B2 (ja) | 2018-03-29 | 2019-03-20 | 造粒物の製造方法および焼結鉱の製造方法 |
US17/041,766 US20210087652A1 (en) | 2018-03-29 | 2019-03-20 | Granulated material, method for producing granulated material, and method for producing sintered ore |
KR1020207027983A KR102498593B1 (ko) | 2018-03-29 | 2019-03-20 | 조립물, 조립물의 제조 방법 및 소결광의 제조 방법 |
EP19776875.7A EP3778935B1 (en) | 2018-03-29 | 2019-03-20 | Method for producing granulated article, method for producing sintered ore |
BR112020019958-3A BR112020019958A2 (pt) | 2018-03-29 | 2019-03-20 | Material granulado, método para produção de material granulado, e método para produção de minério sinterizado |
CN201980022978.9A CN111918974A (zh) | 2018-03-29 | 2019-03-20 | 造粒物、造粒物的制造方法和烧结矿的制造方法 |
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