WO2010114152A1 - バインダー添加方法、バインダー添加装置、混練機及び混練方法 - Google Patents
バインダー添加方法、バインダー添加装置、混練機及び混練方法 Download PDFInfo
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- WO2010114152A1 WO2010114152A1 PCT/JP2010/056131 JP2010056131W WO2010114152A1 WO 2010114152 A1 WO2010114152 A1 WO 2010114152A1 JP 2010056131 W JP2010056131 W JP 2010056131W WO 2010114152 A1 WO2010114152 A1 WO 2010114152A1
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- binder
- raw material
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- water
- supply pipe
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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
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/50—Mixing liquids with solids
- B01F23/54—Mixing liquids with solids wetting solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/70—Spray-mixers, e.g. for mixing intersecting sheets of material
- B01F25/72—Spray-mixers, e.g. for mixing intersecting sheets of material with nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/70—Spray-mixers, e.g. for mixing intersecting sheets of material
- B01F25/72—Spray-mixers, e.g. for mixing intersecting sheets of material with nozzles
- B01F25/721—Spray-mixers, e.g. for mixing intersecting sheets of material with nozzles for spraying a fluid on falling particles or on a liquid curtain
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
- B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
- B01F33/8212—Combinations of dissimilar mixers with consecutive receptacles with moving and non-moving stirring devices
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- 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
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
Definitions
- the present invention relates to a binder addition method, a binder addition device, a kneader, and a kneading method that can uniformly add a binder to an iron ore raw material and that can control the concentration and amount of the binder with high accuracy and speed.
- a binder stock solution also referred to as a granulating agent
- water for adjusting moisture hereinafter referred to as additive water
- the amount of the binder and the amount of added water that is, the concentration and amount of the aqueous binder solution are controlled quickly and accurately, and the aqueous binder solution is uniformly added to the iron ore raw material. It is important for improving quality.
- Patent Document 1 in the granulation of a sintered raw material containing iron ore, water is uniformly dispersed throughout the raw material by spraying a binder and water with separate watering means in a granulator such as a drum mixer. There is a proposed method.
- fine particles in the raw materials are suitably dispersed by a binder functioning as a dispersing agent, and core particles It is important that fine powder adhere to the surface of the coarse particles that become.
- a kneader for kneading the iron ore raw material as a pre-stage for producing the granulated material with a granulator It is necessary to add the binder aqueous solution adjusted to a predetermined concentration uniformly to the iron ore raw material and knead sufficiently in the kneader.
- Patent Document 2 an iron ore raw material containing 60% by mass or more of particles having a particle size of 250 ⁇ m or less is first obtained in a kneader in order to obtain a target particle size distribution when granulating an iron ore material mainly composed of fine powder. Kneading to produce a kneaded product having an average particle size of 3 mm to 7 mm, and thereafter granulating the kneaded product with a drum mixer (granulator) to produce a granulated product having a particle size of 3 mm to 10 mm. A method has been proposed.
- a binder and water are supplied from the body of a blade-rotating kneader and the binder aqueous solution is added in the kneader.
- the method to do is adopted.
- Patent Document 3 in order to uniformly mix the granulating agent into the iron ore raw material in the granulator, the granulating agent and the added water are mixed in advance, and the mixture is sprayed into the granulator.
- a method of mixing with iron ore raw materials has been proposed.
- the residence time of the raw material in the kneading machine is determined by the input amount and the raw material accumulation amount in the kneading machine, but due to the size of the apparatus, it is difficult to make the residence time extremely long and is usually long. In many cases, the time is about 3 minutes. For this reason, since it is necessary to uniformly mix the binder aqueous solution with a uniform concentration in the whole raw material in such a short time, when adding the binder aqueous solution in the kneader, the binder aqueous solution is controlled to a prescribed concentration. It is necessary.
- the configuration of the granulating agent addition apparatus to the granulator described in Patent Document 3 is applied to the addition of the aqueous binder solution to the kneader.
- the binder stock solution and the added water are mixed by a static mixer 10 disposed at a position away from the position of the addition nozzle 6 of the kneader 1 (hereinafter referred to as the addition position), and the binder aqueous solution is mixed.
- a method of conveying to the addition position of the kneader 1 by one pipe 5 can be considered.
- the flow rate of the binder stock solution flowing through the pipe 13 is controlled using the flow rate adjusting valve 11 and the electromagnetic flow meter 12, and the additive water flowing through the pipe 16 is controlled using the flow rate adjusting valve 14 and the electromagnetic flow meter 15.
- both can be mixed by the static mixer 10 to generate a binder aqueous solution having a specified concentration, and the binder aqueous solution can be supplied to the kneader 1 through one pipe 5.
- iron ore raw materials are often stored outdoors, and the moisture contained in the iron ore raw materials (hereinafter referred to as raw material moisture) changes frequently due to the influence of the weather.
- raw material moisture changes frequently due to the influence of the weather.
- the blending ratio of a plurality of types of iron ore raw materials is changed, and the raw material moisture changes depending on the blending ratio. Due to these causes, the moisture of the iron ore raw material charged into the kneading machine 1 fluctuates frequently and is not stable. For this reason, even if a binder aqueous solution having a specified concentration is generated by the static mixer 10 and added in the kneader 1, the binder concentration actually acting on the raw material varies depending on the raw material moisture.
- the binder concentration and the added amount of the aqueous binder solution are adjusted according to changes in the moisture content of the raw material, both the mass of the solid content in the binder stock solution and the moisture mass consisting of the sum of the mass of moisture in the binder stock solution and the mass of added water. It is necessary to control with high accuracy.
- the concentration of the aqueous binder solution remaining in the pipe 5 becomes higher than the optimum condition for the reduced raw material moisture. Yes. That is, when the raw material moisture is reduced, it is necessary to relatively increase the amount of added water. Therefore, it is necessary to lower the concentration of the aqueous binder solution itself before the reduction of the raw material moisture, but the binder remaining in the pipe 5 The aqueous solution cannot be adjusted and the binder concentration remains high.
- the binder concentration becomes too high during kneading by the kneader 1, and the kneaded product becomes a solid clay and cannot be granulated (hereinafter referred to as a slurry state).
- the concentration of the aqueous binder solution remaining in the pipe 5 is lower than the optimum condition for the raw material moisture after the increase. For this reason, a binder density
- the flow rate cannot be adjusted instantaneously even when the raw material moisture changes by only 0.5% by mass, and the control flow rate is stable. There is a possibility that the above-mentioned serious trouble may occur because a time delay occurs until the operation is completed.
- the responsiveness to the change in the binder concentration according to the fluctuation of the raw material moisture is poor, so it is added to the raw material. It was very difficult to control the concentration and amount of the binder to be quickly with high accuracy.
- the binder in order to improve the granulation property in the granulation step, in the kneading step of previously kneading the iron ore raw material mainly composed of fine powder, the binder can be uniformly added to the raw material, and There has been a demand for a method that can quickly and accurately control the concentration and amount of the added binder in accordance with the amount of raw material transport and the amount of raw material moisture that change from moment to moment.
- the present invention has been made in view of the above problems, and an object of the present invention is to uniformly add a binder to an iron ore raw material, and to accurately adjust the concentration and amount of the binder. It is an object of the present invention to provide a new and improved binder addition method, binder addition device, kneader and kneading method that can be quickly controlled.
- the inventors have intensively studied, and as a result, the binder and the added water are mixed by a mixing nozzle that is opened on the outlet side, and sprayed on the raw material charged into the raw material charging portion of the kneader.
- the present inventors have found that the addition amount and the binder concentration can be quickly controlled and uniformly mixed with the iron-making raw material with respect to the moisture change of the iron ore raw material without damaging the pressure balance of the binder stock solution and the added water.
- the binder aqueous solution mixed uniformly can be obtained by making the sprayed additional water collide and contact with a binder.
- a mixing nozzle that mixes the binder and water separately supplied by the binder supply pipe and the water supply pipe and is released from the outlet side is provided.
- the binder aqueous solution in which the binder and the water are mixed is sprayed from the mixing nozzle to the iron ore raw material charged into the raw material charging portion of the kneader.
- the binder supply piping which supplies a binder, and the water supply piping which supplies water are iron ore raw materials.
- a mixing nozzle that is installed in the vicinity of a raw material charging portion of the kneader and mixes the binder and the water separately supplied by the binder supply pipe and the water supply pipe and has an outlet side open, and The mixing nozzle sprays an aqueous binder solution formed by mixing the binder and the water onto the iron ore raw material charged into the raw material charging unit of the kneader, and provides a binder addition device. Is done.
- a kneader comprising the binder adding device.
- sprinkling binder aqueous solution with respect to the iron ore raw material thrown into the raw material input part of a kneader using the said binder addition apparatus sprinkling binder aqueous solution with respect to the iron ore raw material thrown into the raw material input part of a kneader using the said binder addition apparatus.
- a kneading method characterized by kneading the iron ore raw material in the kneader.
- the mixing nozzle has a double structure including an outer nozzle and an inner nozzle arranged in the outer nozzle, and the binder supply pipe is connected to one of the outer nozzle or the inner nozzle, The water supply pipe is connected to the other of the outer nozzle or the inner nozzle, and the water supplied by the water supply pipe to the binder supplied into the outer nozzle by the binder supply pipe.
- the binder and the water are mixed in the outer nozzle to produce the binder aqueous solution, and the binder aqueous solution is sprayed from the nozzle port of the outer nozzle to the iron ore raw material. May be.
- the binder supply pipe is connected to an inflow port penetratingly formed on a side surface of the outer nozzle, and the water supply pipe is connected to communicate with the inner nozzle, from the inflow port of the outer nozzle.
- the binder aqueous solution may be generated by spraying the water from the nozzle port of the inner nozzle to the binder discharged into the outer nozzle to mix the water with the binder.
- the water supply pipe is connected to an opening formed through a side surface of the outer nozzle, and the binder supply pipe is connected to communicate with the inner nozzle, and is connected to the outer nozzle from the nozzle port of the inner nozzle.
- the binder aqueous solution may be generated by spraying the water from the opening of the outer nozzle to the binder discharged into the nozzle to mix the water with the binder.
- the binder may be a polyacrylic acid-based dispersant.
- stock solution is 5000 mPa * s or less.
- the flow rate of at least one of the binder supply pipe and the water supply pipe may be controlled according to the water content of the iron ore raw material or the input amount of the iron ore raw material to the kneader. Good.
- the iron ore raw material includes fine powder and core particles that are kneaded by the granulator and then granulated by the granulator, and the binder is a dispersant that disperses the fine powder in the iron ore raw material. You may do it.
- the mixing nozzle is installed in the vicinity of the raw material charging portion of the kneader, and the binder and water are conveyed to the mixing nozzle in the addition position (near the raw material charging portion) through separate pipes. Can be controlled with high accuracy.
- the mixing nozzle mixes the binder and water separately supplied by the binder supply pipe and the water supply pipe to generate a binder aqueous solution, and the binder aqueous solution is used as an iron ore raw material to be input to the raw material input portion of the kneader. Spray against.
- concentration can be uniformly added with respect to the said iron ore raw material. Furthermore, since the mixing nozzle mixes the binder and water under an open pressure, the concentration of the aqueous binder solution can be quickly changed, and by providing the mixing nozzle near the raw material charging portion, Concentrated aqueous binder solution can be immediately added to the iron ore raw material. Therefore, according to the fluctuation
- the binder can be uniformly added to the iron ore raw material, and the concentration and amount of the binder can be quickly controlled with high accuracy.
- FIG. 1 is an explanatory view showing a fixing layer adhering to the inner peripheral surface of a body portion of a conventional blade rotating kneader.
- FIG. 2 is a schematic diagram showing a binder addition method using a static mixer.
- FIG. 3 is a schematic diagram showing a modified example of the binder addition method using a static mixer.
- FIG. 4 is a schematic diagram showing a sintering facility equipped with a kneader according to the first embodiment of the present invention.
- FIG. 5 is a schematic view showing a kneader equipped with a binder addition apparatus according to the embodiment.
- FIG. 6 is a schematic view showing a mixing nozzle of the binder adding apparatus according to the embodiment.
- FIG. 7 is a schematic diagram illustrating a mixing nozzle of a binder addition device according to a modified example of the embodiment.
- FIG. 4 is a schematic diagram showing the overall configuration of a sintering facility to which a kneader equipped with a binder addition apparatus according to this embodiment is applied.
- the sintering equipment mainly includes a pseudo granulation line 20, a pellet granulation line 30, and a sintering machine 40.
- the pellet granulation line 30 is a production line for producing a granulated product (hereinafter referred to as “sintered raw material pellet”) obtained by granulating an iron ore raw material mainly composed of fine powder.
- the pseudo granulation line 20 granulates an iron ore raw material containing fine powder and coarse particles, and a granulated product in which the fine powder is adhered to the coarse particles serving as core particles (hereinafter referred to as “pseudo granulated product”). It is a manufacturing line for manufacturing.
- the iron ore raw material is used as a sintering raw material for producing the sintered ore with the sintering machine 40.
- This sintering raw material is, for example, iron ore raw material, which is the main raw material, and ironmaking dust (blast furnace dust collection dust, converter dust, etc.), pellet feed, limestone, dolomite, silica, olivine, coke powder,
- the mixed raw material which added 1 type, or 2 or more types, such as anthracite, can be used.
- the iron ore raw material is not limited as long as it is an iron ore used as a normal sintering raw material.
- iron ore containing a large amount of crystal water in addition to hematite or magnetite for example, goethite, limonite (pisolite ore) Etc.
- hematite or magnetite for example, goethite, limonite (pisolite ore) Etc.
- porous for example, maramamba ore, high phosphorus block man ore, etc.
- the iron ore raw material contains a large amount of fine powder, the granulation property is poor, the strength of the granulated product is weakened, and the granulated product in the conveying process up to the sintering machine 40 or the sintering process in the sintering machine 40 Collapses. For this reason, when an iron ore raw material containing a large amount of such fine powder is directly introduced into the sintering machine 40, the air permeability is greatly deteriorated and the productivity of the sintered ore is hindered. Therefore, the iron ore raw material is subjected to a granulation treatment to increase the strength of the granulated product.
- the iron ore raw materials as described above are classified according to the ore type and particle size, and granulated (pseudo-particleized or pelletized) respectively in two types of granulation lines, the pseudo granulation line 20 and the pellet granulation line 30.
- granulation lines are described in detail below.
- the pseudo-granulation line 20 is a line for manufacturing a pseudo-granulated product in which fine particles (for example, a particle size of 250 ⁇ m or less) are adhered to coarse particles (for example, a particle size of 3 mm or more) of an iron ore raw material serving as core particles.
- the pseudo granulation line 20 includes a raw material tank 21 for storing a sintering raw material including coarse particles and fine powder, a sieve sorter 22, and a kneading for kneading the sintering raw material with a water-soluble binder or the like. And a granulator 24 that granulates the kneaded sintered raw material to produce a pseudo-granulated product.
- the raw material tank 21 stores, for example, iron ore containing coarse particles and fine powder (for example, pisolite ore), iron ore raw material containing powdered coke, limestone, and the like. It is sorted into coarse particles having a predetermined particle size or more (for example, 3 mm or more) and fine particles having a particle size smaller than that. Of these, the coarse particles can be used as core particles as they are, and are therefore conveyed to the granulator 24.
- iron ore containing coarse particles and fine powder for example, pisolite ore
- iron ore raw material containing powdered coke limestone, and the like. It is sorted into coarse particles having a predetermined particle size or more (for example, 3 mm or more) and fine particles having a particle size smaller than that. Of these, the coarse particles can be used as core particles as they are, and are therefore conveyed to the granulator 24.
- the fine powder is charged into a kneading machine 23 made of, for example, a Redige mixer and kneaded with a binder to produce a kneaded product.
- a blade rotation type kneading machine such as a pro shear mixer or an Eirich mixer can be used.
- the binder added to the kneader includes, for example, a polyacrylic acid-based dispersant (for promoting solid crosslinking, and includes an aqueous solution and a colloid to which the dispersant is added from the viewpoint of enhancing granulation properties. ), At least one of quicklime and lignin can be used.
- a polyacrylic acid-based dispersant for promoting solid crosslinking, and includes an aqueous solution and a colloid to which the dispersant is added from the viewpoint of enhancing granulation properties.
- At least one of quicklime and lignin can be used.
- the kneaded product obtained by the kneader 23 and the coarse particles from the sieve sorter 22 are charged into a granulator 24 such as a drum mixer.
- a drum mixer, a pan pelletizer, or the like can be used as the granulator 24, and the kneaded material of the iron ore raw material is granulated (pseudo-particles) by the granulator 24 to become a pseudo-granulated product.
- fine particles for example, a particle size of 250 ⁇ m or less
- a pseudo granulated product for example, a particle size of 1 to 10 mm
- the pellet granulation line 30 is a line for producing sintered raw material pellets, which are granulated products obtained by granulating an iron ore raw material mainly composed of fine powder having a predetermined particle size or less.
- the iron ore raw material mainly composed of fine powder is, for example, an iron ore raw material containing 60% by mass or more of particles having a particle size of 250 ⁇ m or less.
- the sintered raw material pellet is, for example, a granulated product having a particle size of 1 to 10 mm and an average particle size of 5 mm.
- the sintered raw material pellet is a granulated product containing 70% by mass or more of particles having a particle size of 3 mm or more.
- the pellet granulation line 30 includes a raw material tank 31 for storing iron ore raw materials mainly composed of fine powder, a sieve sorter 32, a pulverizer 33 for pulverizing the iron ore raw materials, and pulverization.
- a granulated machine 34 for kneading the later sintered raw material and a binder, a granulator 35 for granulating the kneaded sintered raw material to produce a sintered raw material pellet, a sieve sorter 36, and granulated A dryer 37 for drying the sintered raw material pellets.
- the kneading machine 34 is an example of a kneading machine provided with the binder addition apparatus of the present invention, and the detailed description thereof will be described later.
- various iron ore raw materials for example, maramamba ore, high phosphorus block man ore, etc.
- a sintering raw material containing a binder such as is stored.
- coarse particles having a predetermined particle diameter or more are selected and removed in advance by a sieve sorter (not shown) or the like to obtain a fine powder (for example, particle diameter of 3 mm or less). It is preferable from the viewpoint of facilitating and developing the strength of the granulated product.
- the iron ore raw material supplied from the raw material tank 31 is first screened by a sieve sorter 32, and fine powder having a predetermined particle size (for example, 3 mm) or less is supplied to a pulverizer 33.
- the particles having a predetermined particle diameter or more are supplied to the granulator 24 of the pseudo-granulation line 20 to be used as the core particles of the above-described pseudo-granulated product.
- the pulverizer 33 is composed of, for example, a roller press compressor, a ball mill, or the like, and pulverizes the iron ore material that has been charged into a predetermined particle size distribution.
- the subsequent granulation process can be facilitated by pulverizing and finely pulverizing and sizing the iron ore raw material.
- the binder and moisture are added to adjust the moisture, and then the fine iron ore raw material is kneaded.
- the kneading machine 34 for example, a blade rotation type kneading machine such as a Redige mixer or a Proshear mixer is used.
- a blade rotation type kneading machine such as a Redige mixer or a Proshear mixer is used.
- it is set as the structure which improved the kneading
- the binder added to the kneader includes, for example, a polyacrylic acid-based dispersant (for promoting solid crosslinking, and includes an aqueous solution and a colloid to which the dispersant is added from the viewpoint of enhancing granulation properties. ), At least one of quicklime and lignin can be used.
- a polyacrylic acid-based dispersant for promoting solid crosslinking, and includes an aqueous solution and a colloid to which the dispersant is added from the viewpoint of enhancing granulation properties.
- At least one of quicklime and lignin can be used.
- a polyacrylic acid-based dispersant for promoting solid crosslinking, and includes an aqueous solution and a colloid to which the dispersant is added from the viewpoint of enhancing granulation properties.
- quicklime and lignin can be used as the binder to be added to the kneader in the granulation process using the sintering facility according to
- the sintered raw material after being kneaded by the kneader 34 is charged into the granulator 35 and granulated.
- the granulator 35 for example, a drum mixer or a pan pelletizer can be used.
- sintered raw material pellets which are substantially spherical granules having a particle diameter of 1 to 10 mm, preferably 3 to 6 mm (for example, an average particle diameter of 5 mm) are manufactured.
- a particle size distribution of the sintered raw material pellets for example, a particle size of 3 mm or more may be 70% by mass.
- the sintered raw material pellets thus manufactured are dried by a dryer 37 after a granulated material having a predetermined particle size or more is sorted by a sieve sorter 36.
- a dryer 37 a fluidized bed dryer, a packed bed dryer, a drum dryer or the like can be used.
- the pseudo-granulated product granulated in the pseudo-granulation line 20 and the sintered raw material pellets granulated in the pellet granulation line 30 are blended at a predetermined blending ratio, and the sintering machine 40.
- the sintering machine 40 sinters the two kinds of sintered raw material granules to produce a sintered ore.
- the sintered ore is supplied to the blast furnace after being crushed by a crusher (not shown) and cooled by a sintered cooler (not shown).
- kneaders 23 and 34 are provided in the preceding stages in order to improve the granulation performance in the granulators 24 and 35, respectively.
- 34 after adding a binder to the iron ore raw material and kneading, the obtained kneaded material is provided to the granulators 24 and 35 for granulation.
- the present embodiment has a feature in a binder addition method at the time of kneading by the kneaders 23 and 34, and the kneaders 23 and 34 have a characteristic structure for realizing the binder addition method.
- a kneader 50 shown in FIG. 5 described later can be suitably applied to the kneaders 23 and 34 of the sintering equipment shown in FIG.
- the binder addition apparatus and the binder addition method of the kneader 50, which are the characteristics according to the present embodiment, will be described later (see FIGS. 5 to 7).
- the binder stock solution and water for adjusting water are mixed using the static mixer 10.
- a binder aqueous solution having a predetermined concentration was generated, and this binder aqueous solution was supplied to the kneading machine 1 through one pipe 5 and added to the iron ore raw material from the trunk portion 2 of the kneading machine 1.
- the moisture (raw material moisture) contained in the iron ore raw material charged into the kneading machine 1 varies, the appropriate value of the binder concentration added to the raw material also changes every moment.
- the binder concentration added to the iron ore raw material in the kneading machine 1 is not an appropriate value, the granulation property in the subsequent granulation step is lowered. Therefore, when the raw material moisture changes, it is necessary to change the binder concentration to a concentration suitable for the changed raw material moisture as quickly as possible.
- the binder addition method shown in FIGS. 2 and 3 is an apparatus configuration for supplying the binder aqueous solution through one pipe 5 from the static mixer 10 to the kneader 1, the flow rate is adjusted immediately when the raw material moisture changes. Even if the flow rate of the binder stock solution and additive water supplied to the static mixer 10 by the valves 11 and 14 is adjusted to control the binder concentration suitable for the raw material moisture after the change, the binder remaining in the pipe 5 remains.
- An aqueous solution (a binder aqueous solution having a concentration suitable for the raw material moisture before the change) is inevitably supplied to the kneader 1 and added to the raw material.
- the change in the binder concentration is delayed by the amount of the binder aqueous solution remaining in the pipe 5. .
- Table 2 shows the result of verifying the deviation from the appropriate value of the binder solid content in the raw material when the raw material moisture ratio increases from 8.0% by mass to 8.5% by mass.
- a pipe 50A having a length of 20 m was used as the pipe 5 in the binder addition method of FIG.
- binder aqueous solution is the aqueous solution which mixed the binder stock solution and water (addition water), and raw material water
- moisture content is the water
- Mass of moisture in binder stock solution WB (ton) Mass of solid in binder stock solution: SB (ton) Mass of added water: WW (ton) Mass of raw material moisture before being put into kneading machine: WF (ton) Mass of iron ore raw material before being put into kneading machine: SF (dry-ton)
- the binder concentration CB is the concentration (mass%) of the aqueous binder solution added to the iron ore raw material and is represented by the following formula.
- CB ⁇ SB / (SB + WB + WW) ⁇ ⁇ 100
- the binder aqueous solution addition amount T is the mass of the binder aqueous solution added to the iron ore raw material, and is represented by the following formula.
- T SB + WB + WW
- the binder solid content ratio RS is a ratio (mass%) of the solid mass SB in the binder stock solution to the mass SF of the iron ore raw material, and is represented by the following formula.
- the raw material water ratio RW0 is the ratio (mass%) of the raw material water mass WF to the total mass (SF + WF) of the iron ore raw material and raw material water, and is represented by the following formula.
- RW0 ⁇ WF / (SF + WF) ⁇ ⁇ 100
- the raw material moisture ratio RW1 after mixing is the ratio (mass%) of the mass of the total moisture to the total mass after the binder aqueous solution and the iron ore raw material are mixed, and is represented by the following formula.
- RW1 ⁇ (WF + WB + WW) / (SF + SB + WF + WB + WW) ⁇ ⁇ 100
- the binder concentration becomes too high in the kneading.
- the binder is excessively supplied and the kneaded material is slurried, which causes a serious influence such as a decrease in granulation property of the kneaded material or a failure to convey the kneaded material.
- the binder addition method is a state in which the flow rate of the binder stock solution and the added water is controlled with high accuracy by separate pipes, as described in detail below.
- the iron ore raw material is fed to the raw material charging part of the kneading machine and mixed with a mixing nozzle arranged in the vicinity of the raw material charging part to form a binder aqueous solution, and the binder aqueous solution is fed from the mixing nozzle to the kneading machine. It is characterized by adding to.
- FIG. 5 is a schematic diagram showing a kneader equipped with a binder addition apparatus according to this embodiment.
- the kneader 50 shown in FIG. 5 is applicable to the kneaders 23 and 34 provided in the pseudo granulation line 20 and the pellet granulation line 30 of the sintering equipment shown in FIG.
- the kneader 50 is a kneader having a blade rotation structure, and includes, for example, a Redige mixer, a Proshare mixer, and the like.
- the kneading machine 50 includes a cylindrical body 52 that accommodates an object to be kneaded (for example, iron ore raw material 57), a plurality of stirring blades 53 that are rotated by a rotating shaft 54, and a drive unit that rotates the rotating shaft 54 (see FIG. (Not shown), a raw material charging unit 55 including a reverse cone-shaped raw material charging hopper, and a transporting unit 56 such as a belt conveyor for transporting the iron ore raw material 57.
- the iron ore raw material 57 transported by the transport unit 56 falls from the end of the transport unit 56 and is fed from the raw material charging unit 55 into the body 52 of the kneader 50.
- a binder aqueous solution is added to the iron ore raw material 57 from a mixing nozzle 70 described later.
- the iron ore raw material 57 thrown into the body 52 advances in the body 52 in a predetermined direction (for example, the left direction in FIG. 5) while being stirred by the stirring blade 53 that rotates about the rotation shaft 54.
- the iron ore raw material 57 and the aqueous binder solution are kneaded to produce a kneaded product (for example, a particle size of several hundred ⁇ m to several mm) having a predetermined particle size suitable for granulation in the subsequent granulation step.
- This kneaded material is discharged from a discharge port (not shown) of the body portion 52 and conveyed to a granulator.
- the kneader 50 is characterized by the structure and addition method of a binder addition device that adds a binder to the iron ore raw material 57.
- the binder is a granulating agent used for granulating an iron ore raw material containing fine iron ore.
- a polyacrylic acid-based dispersant for keeping the dispersibility of the fine particles of the iron ore raw material high in order to improve the granulation property in the subsequent granulation step of the kneading step.
- a binder for example, a granulating agent (polyacrylic acid-based dispersant) described in JP-A No. 2003-155524 can be suitably used.
- This granulation treatment agent contains a water-soluble polymer compound having a clay dispersibility of 0.5 or more.
- the polymer compound contains a carboxyl group and / or a salt thereof, has a number average molecular weight in the range of 500 or more and 20000 or less, and a polydispersity expressed by weight average molecular weight / number average molecular weight is 1. .2 or more and 12.0 or less.
- the polymer compound is selected from the group consisting of, for example, (a) polyacrylic acid, (b) part or all of the carboxyl groups contained in polyacrylic acid are sodium, potassium, calcium, and ammonia. It may be at least one compound selected from the group consisting of at least one neutralized polyacrylate.
- the fine powder By adding such a polyacrylic acid-based dispersant to the iron ore raw material containing iron ore fine powder as a binder, the fine powder can be evenly dispersed within the raw material, so that the fine powders are solidified together. Instead, the dispersed fine powder can be attached around the core particles (coarse particles). Therefore, when the iron ore raw material containing fine powder is granulated (pseudo-particle or pelletized), the dispersibility of the fine powder in the raw material is kept high, and the dispersed fine powder is attached around the core particles. The effect can be enhanced. Therefore, the iron ore raw material can be suitably granulated (pseudo-particle or pelletized), and the granulation property can be improved.
- the binder addition apparatus includes a binder supply pipe 63 for supplying a binder stock solution, a water supply pipe 66 for supplying water for adjusting water (added water), the binder supply pipe 63 and water.
- a mixing nozzle 70 connected to the tip of the supply pipe 66 and a control device (not shown) for controlling the flow rates of the binder supply pipe 63 and the water supply pipe 66 are provided.
- the binder supply pipe 63 is a pipe for supplying the binder stock solution to the mixing nozzle 70 from a binder supply source (for example, a binder stock solution tank, not shown).
- a flow rate adjusting valve 61 and an electromagnetic flow meter 62 are provided in the middle of the binder supply pipe 63.
- the electromagnetic flow meter 62 measures the flow rate of the binder stock solution flowing in the binder supply pipe 63, and the flow rate adjustment valve 61 is based on the measurement result of the electromagnetic flow meter 62 and information such as the raw material moisture content or the raw material input amount.
- the flow rate of the binder stock solution in the binder supply pipe 63 is controlled to a set predetermined flow rate.
- the binder supply pipe 63 supplies the binder stock solution as the binder of the present invention.
- the present invention is not limited to this example.
- the binder aqueous solution in which the binder stock solution is previously diluted to a predetermined concentration. May be supplied.
- the water supply pipe 66 is a pipe for supplying additive water for adjusting the concentration of the aqueous binder solution from a water supply source (for example, a water tank, not shown) to the mixing nozzle 70.
- a flow rate adjusting valve 64 and an electromagnetic flow meter 65 are provided in the middle of the water supply pipe 66.
- the electromagnetic flow meter 65 measures the flow rate of the additive water flowing in the water supply pipe 66, and the flow rate adjustment valve 64 is based on the measurement result of the electromagnetic flow meter 65 and information such as the raw material moisture ratio or the raw material input amount.
- the flow rate of the added water in the water supply pipe 66 is controlled to a set predetermined flow rate.
- the binder addition device includes a control device (not shown), and data obtained by measuring the raw material moisture and the input amount of the iron ore raw material 57 input to the kneader 50 is input to the control device. . Based on the input data, the control device obtains information such as the raw material moisture content or the raw material input amount, calculates the control amount of the flow rate adjustment valve 61 or the flow rate adjustment valve 64, and sets the opening degree of each adjustment valve. Instruct.
- the raw material moisture constantly varies depending on the storage state of the iron ore raw material, the weather, the raw material mixing ratio, and the like.
- the control device of the binder addition device controls the flow rate adjustment valve 61 or the flow rate adjustment valve 64 in accordance with the fluctuation of the raw material moisture, and determines the amount of the binder stock solution and the amount of added water supplied to the mixing nozzle 70. Control accurately.
- the amount of raw material input the amount of iron ore raw material is basically supplied quantitatively by setting the amount cut out from the raw material tank.
- the amount of raw material input by the transport unit 56 is measured by a measuring means such as a belt scale, and the amount of the binder stock solution and the amount of added water are adjusted according to the measured values. It is also possible to control with high accuracy.
- the above-described binder supply pipe 63, water supply pipe 66, and flow rate control mechanism thereof can control the flow rates of the binder stock solution and added water supplied to the mixing nozzle 70 with high accuracy. Therefore, the concentration and amount of the binder aqueous solution added to the iron ore raw material 57 from the mixing nozzle 70 can be controlled with high accuracy in accordance with the raw material moisture of the iron ore raw material 57 and the raw material input amount.
- the mixing nozzle 70 puts the binder stock solution and water separately supplied through the binder supply pipe 63 and the water supply pipe 66, respectively, and the aqueous binder solution obtained by the mixing into the kneader 50. It has a function of spraying on the iron ore raw material 57. Also, since the mixing nozzle 70 is open on the outlet side, unlike the static mixer, the binder stock solution and the added water do not interfere with each other in the static mixer and the pressure balance between the two is not lost. Even if the supply amount is changed, the flow rate is stabilized without any control delay. By using the mixing nozzle 70, the binder addition method according to the present embodiment can be suitably executed.
- the mixing nozzle 70 is provided in the vicinity of the raw material charging unit 55 of the kneader 50 and sprays the aqueous binder solution directly on the iron ore raw material 57 charged into the raw material charging unit 55.
- the vicinity of the raw material charging portion 55 where the mixing nozzle is disposed is an arbitrary position where the binder aqueous solution can be directly sprayed from the mixing nozzle 70 to the iron ore raw material 57 charged into the kneader 50. is there.
- the mixing nozzle 70 may be disposed in the vicinity of the raw material charging unit 55 (a position where the mixing nozzle 70 is separated from the raw material charging unit 55). You may install in the arbitrary locations (for example, hopper side surface) of the raw material injection
- the mixing nozzle 70 in the vicinity of the raw material charging portion 55 of the kneader 50, the aqueous binder solution mixed by the mixing nozzle 70 is supplied to the iron ore raw material 57 charged into the raw material charging portion 55. Can be sprayed and added directly.
- the binder addition apparatus which concerns on this embodiment increases the responsiveness with respect to the fluctuation
- the binder stock solution and the addition water are accurately used by using separate pipes 63 and 66 up to the vicinity of the raw material charging portion 55 of the kneader 50 (in the vicinity of the binder addition position). It conveys in the state by which flow control was carried out, it mixes with the mixing nozzle 70, and is directly added to the iron ore raw material 57.
- FIG. For example, when the raw material moisture rises, the flow rate adjusting valve 64 reduces the flow rate of the added water in the water supply pipe 66 by an appropriate amount. Further, when the raw material moisture decreases, the flow rate adjusting valve 64 increases the flow rate of the added water in the water supply pipe 66 by an appropriate amount.
- the mixing nozzle 70 mixes the binder stock solution and the added water after the flow rate is individually adjusted with high accuracy by the binder supply pipe 63 and the water supply pipe 66, so that the concentration is suitable for the raw material moisture after the fluctuation.
- a binder aqueous solution is generated with high accuracy and speed and added.
- the method of controlling the amount of added water in the water supply pipe 66 by adjusting the flow rate of the additive water in the water supply pipe 66 by the flow rate adjusting valve 64 with respect to the increase or decrease of the raw material moisture has been described. It is also possible to control the amount of binder input by adjusting the flow rate of the binder stock solution in the binder supply pipe 63 by the adjusting valve 61. However, in this case, since the net amount of the binder fed into the kneading machine 50 is changed, and the addition ratio of the binder to the raw material is changed, the flow rate adjusting valve 64 described above causes the water supply pipe 66 to be inside. It is preferable to use a method of adjusting the flow rate of the added water.
- the binder addition method according to the present embodiment does not need to use the static mixer 10 having poor responsiveness to the change in the binder concentration according to the fluctuation of the raw material moisture, and uses the mixing nozzle 70 as the mixing means.
- the binder concentration can be changed immediately in response to the fluctuation of the raw material moisture, and the response of the binder concentration control is excellent. Therefore, the binder concentration can be controlled with high accuracy, and the aqueous binder solution having the optimum concentration to the raw material moisture after the fluctuation can be quickly added.
- the mixing nozzle 70 the binder stock solution and the added water are mixed in advance before the addition to generate a uniform concentration binder aqueous solution, and the binder aqueous solution is directly sprayed from the mixing nozzle 70 to the iron ore raw material 57 to be charged. To do. Thereby, there is an effect that a binder aqueous solution having a uniform concentration can be uniformly added to the iron ore raw material 57.
- the aqueous binder solution is not added from the barrel 52 of the kneader 50, but the aqueous binder solution is added to the iron ore raw material 57 at a position before being introduced into the kneader 50.
- the fixing layer 4 formed on the inner peripheral surface of the body portion 2 of the kneading machine 1 as shown in FIG. 1 prevents the addition of the aqueous binder solution and can prevent the problem of non-uniform addition. .
- the binder aqueous solution is not added from the barrel portion 52, and the binder aqueous solution is added to the iron ore raw material 57 before being fed into the barrel portion 52 from the mixing nozzle 70 disposed in the vicinity of the raw material throwing portion 55. Is added. For this reason, even if the fixing layer 4 is formed on the inner peripheral surface of the body portion 52 of the kneader 50, the uniform addition of the binder is not inhibited by the fixing layer 4, and the binder is uniformly applied to the iron ore raw material 57. Can be added.
- FIG. 6 is a longitudinal sectional view showing a configuration example of the mixing nozzle 70 of the binder addition apparatus according to the present embodiment.
- the mixing nozzle 70 has a double cylindrical structure composed of an outer nozzle 71 and an inner nozzle 72.
- the outer nozzle 71 is a cylindrical member having a relatively large diameter
- the inner nozzle 72 is a cylindrical member having a smaller diameter than the outer nozzle 71.
- the inner nozzle 72 is disposed inside the outer nozzle 71 so that the cross section is concentric.
- the mixing nozzle has a double cylindrical structure, but is not limited to a cylindrical structure, and may have a polygonal cylindrical structure.
- the tip of the binder supply pipe 63 is connected to an inlet 74 formed through the side surface of the outer nozzle 71.
- the binder supply pipe 63 is connected perpendicularly to the side surface of the outer nozzle 71, but this connection angle is not particularly limited.
- one binder supply pipe 63 is connected to the outer nozzle 71 at one location.
- the present invention is not limited to this example.
- a plurality of binder supply pipes 63 are connected to the outer nozzle 71. You may connect to the multiple places of the circumferential direction. Thereby, the binder can be supplied into the outer nozzle 71 more uniformly.
- the binder stock solution B is simply dropped from the binder supply pipe 63 and supplied into the outer nozzle 71 as shown in the example of FIG.
- the binder stock solution B is sprayed using a spray nozzle in the same manner as the spraying of the added water W. Can be sprayed into the outer nozzle 71 and supplied.
- the tip of the water supply pipe 66 is connected to communicate with the inner nozzle 72.
- a socket 73 for reducing the pipe diameter is connected to the distal end portion of the water supply pipe 66, and an inner nozzle 72 that is a spray nozzle for added water is further connected to the distal end portion of the socket 73. Is connected.
- the added water W supplied by the water supply pipe 66 can be sprayed into the outer nozzle 72 from the nozzle port 75 at the tip of the inner nozzle 72.
- the present invention is not limited to an example in which a nozzle member is separately attached to the tip of the water supply pipe 66 and configured as the inner nozzle 72 as shown in the figure.
- the tip of the water supply pipe 66 and the inner nozzle 72 are configured integrally.
- the tip of the water supply pipe 66 itself may function as the inner nozzle 72.
- the tip of the water supply pipe 66 and the inner nozzle 72 are disposed in the outer nozzle 71 in the same direction as the axial direction of the outer nozzle 71, and the added water W is diffused to the tip of the inner nozzle 72.
- a nozzle port 75 having a structure to be sprayed is provided.
- the position of the nozzle port 75 at the tip of the inner nozzle 72 is downstream (downward) from the inlet 74 of the outer nozzle 71 to which the binder supply pipe 63 is connected, and the nozzle port at the tip of the outer nozzle 71. It is arranged inside the nozzle (upper side) than 76.
- the additive water W is diffused and sprayed from the nozzle port 75 of the inner nozzle 72 downward to the inside of the outer nozzle 71 and collides with the binder stock solution B that hangs down along the inner surface of the outer nozzle 71. It is supposed to be mixed.
- the binder can be uniformly mixed in the additive water. Thereby, the binder can be supplied into the outer nozzle 71 more uniformly.
- the binder stock solution B supplied via the binder supply pipe 63 is discharged (inflowed) into the outer nozzle 71 from the inlet 74 of the outer nozzle 71 and hangs down along the inner peripheral surface of the outer nozzle 71.
- the added water W supplied via the water supply pipe 66 is diffused and sprayed into the outer nozzle 71 from the nozzle port 75 of the inner nozzle 72.
- the diffused / sprayed additive water W and the binder stock solution B collide and mix on the inner lower side of the outer nozzle 71 to generate a binder aqueous solution M having a predetermined concentration.
- the binder aqueous solution M is sprayed toward the iron ore raw material 57 from the nozzle port 76 at the tip of the outer nozzle 71 by the spray pressure of the added water W.
- the mixing nozzle 70 can produce
- FIG. 7 is a longitudinal sectional view showing the configuration of the mixing nozzle 70 of the binder addition apparatus according to the modified example of the present embodiment.
- the mixing nozzle 70 according to the modified example also has a double cylindrical structure including an outer nozzle 81 and an inner nozzle 82, similarly to the mixing nozzle 70 of FIG.
- the outer nozzle 81 is a relatively large diameter cylindrical member
- the inner nozzle 82 is a smaller diameter cylindrical member than the outer nozzle 81.
- the inner nozzle 82 is disposed inside the outer nozzle 81 so that the cross section is concentric.
- the tip of the binder supply pipe 63 is integrated with the inner nozzle 82. That is, the inner diameter and the outer diameter of the binder supply pipe 63 and the inner nozzle 82 are the same, the tip of the binder supply pipe 63 functions as the inner nozzle 82, and the port of the binder supply pipe 63 is the nozzle port 85. Function as. Such a configuration is useful, for example, when the viscosity of the binder stock solution B is relatively high, and the binder stock solution B supplied by the binder supply pipe 63 is discharged from the nozzle port 85 of the inner nozzle 82 at the tip of the binder stock solution B. Hangs down.
- the nozzle port 82 here means a discharge port for discharging a liquid, and is not limited to a small hole for spraying the liquid.
- a nozzle member for discharging a binder stock solution may be separately attached to the tip of the binder supply pipe 63 so as to function as the inner nozzle 82.
- a spray nozzle inner nozzle 82
- a spray nozzle is provided at the tip of the binder supply pipe 63. (Not shown) may be mounted and the binder stock solution B may be sprayed into the outer nozzle 81 from the nozzle port 85 of the spray nozzle.
- the tip of the water supply pipe 66 is connected to an opening 84 formed through the side surface of the outer nozzle 81.
- a connecting pipe 87 having a diameter larger than that of the water supply pipe 66 is connected to a peripheral portion of the opening 84 of the outer nozzle 81.
- the water supply pipe 66 is attached to the connection pipe 87 via the flange 88 in a state where the tip end portion is disposed inside the connection pipe 86.
- the distal end portion of the water supply pipe 66 is arranged in a direction perpendicular to the extending direction of the outer nozzle 81 and is connected perpendicularly to the side surface of the outer nozzle 81, but is not limited to this connection direction.
- the connecting direction may be arbitrary.
- the distal end portion of the water supply pipe 66 is connected to the periphery of the opening 84 of the outer nozzle 81 via the connection pipe 87 and the flange 88.
- a spray nozzle 90 for spraying the added water W into the outer nozzle 81 is attached to the tip of the water supply pipe 66.
- a socket 89 for reducing the diameter of the pipe is connected to the tip of the water supply pipe 66, and a spray nozzle 90 for added water is connected to the tip of the socket 89.
- the spray nozzle 90 is disposed near the opening 84 of the outer nozzle 81.
- the front end portion of the binder supply pipe 63 and the inner nozzle 82 are arranged in the same direction as the axial direction (for example, the vertical direction) of the outer nozzle 81 inside the outer nozzle 81.
- the position of the nozzle port 85 at the distal end of the inner nozzle 82 is on the inner side (upper side) of the nozzle port 86 at the distal end of the outer nozzle 81, and further, the opening of the outer nozzle 81 to which the water supply pipe 66 is connected. It is arranged on the upstream side (upper side) of 84.
- the added water W is sprayed in the horizontal direction from the spray nozzle 90 disposed in the opening 84 of the outer nozzle 81, and the sprayed added water W is diffused and sprayed inside the outer nozzle 81. It collides and is mixed with the binder stock solution B that hangs down from the nozzle opening 85 of the nozzle 82.
- one water supply pipe 66 is connected to the outer nozzle 81 at one location, but the present invention is not limited to this example.
- a plurality of water supply pipes 66 are connected to the outer nozzle 81. You may connect to the multiple places of the circumferential direction. Thereby, the additional water W can be supplied into the outer nozzle 81 more uniformly.
- the binder stock solution B supplied through the binder supply pipe 63 is discharged (inflowed) from the nozzle port 85 of the inner nozzle 82 into the outer nozzle 81 and drips downward.
- the added water W supplied through the water supply pipe 66 passes from the nozzle port 91 of the spray nozzle 90 disposed in the opening 84 of the outer nozzle 81 toward the binder stock solution B that hangs down in the outer nozzle 81. Diffused and sprayed on.
- the diffused / sprayed additive water W and the binder stock solution B collide and mix on the inner lower side of the outer nozzle 81 to produce a binder aqueous solution M having a predetermined concentration.
- the aqueous binder solution M is sprayed toward the iron ore raw material 57 from the nozzle port 86 at the tip of the outer nozzle 81 by the spray pressure of the added water W.
- the mixing nozzle 70 can produce
- the binder aqueous solution M having a uniform concentration can be generated in the vicinity of the raw material charging portion 55 of the kneader 50 and can be uniformly sprayed on the iron ore raw material 57.
- concentration is also high, and the binder aqueous solution of a uniform density
- the binder addition method of FIG. 2 and FIG. 3 described above is a method in which the binder stock solution and the added water are mixed in the sealed static mixer 10. For this reason, when the pressure balance of the binder raw solution and the added water in the static mixer 10 is lost due to the change in the flow rate of the binder raw solution or the added water, there is a problem that it takes time to become steady.
- the binder stock solution B and the added water W are mixed in the mixing nozzle 70 opened to the atmosphere. Therefore, no pressure is applied to the binder stock solution B and the added water W in the mixing nozzle 70, and the binder stock solution B and the added water W can be mixed in an open pressure. Therefore, it is possible to respond quickly to changes in the binder concentration in accordance with fluctuations in the raw material moisture, and the concentration of the aqueous binder solution that is generated and dispersed is uniform.
- the mixing nozzle 70 is disposed near the raw material charging portion 55 (binder addition position) of the kneader 50, and the flow rate of each of the binder stock solution and the added water is set using the separate pipes 63 and 66. It supplies to the mixing nozzle 70 in the state controlled with high precision. Then, the binder nozzle solution and the added water are mixed by the mixing nozzle 70 to generate a binder aqueous solution, and the binder aqueous solution is directly added to the iron ore raw material 57 charged into the kneader 50.
- This mixing nozzle 70 has a double cylindrical structure in order to uniformly mix the binder stock solution and the added water in advance before the addition.
- the mixing nozzle 70 sprays the added water W onto the binder stock solution B inside the outer nozzles 71 and 81, thereby causing the binder stock solution B and the added water W to collide and mix to form a binder having a uniform concentration.
- the aqueous solution M can be generated and sprayed on the iron ore raw material 57.
- the binder addition method can uniformly add a binder aqueous solution having a uniform concentration to the iron ore raw material, and add it to the raw material according to the amount of raw material input or the fluctuation of raw material moisture.
- the concentration and amount of the binder can be quickly controlled with high accuracy.
- the raw material moisture constantly fluctuates depending on the storage state of the iron ore raw material, the weather, the raw material mixing ratio, and the like.
- the amount of the binder stock solution and the amount of added water can be controlled with high accuracy in accordance with the fluctuation of the raw material moisture.
- the raw material input amount for example, the raw material input amount of the iron ore raw material conveyed by the conveying unit 56 is measured before being introduced into the kneader 50, and the binder stock solution amount and the added water amount are adjusted according to the measured values. It can be controlled with high accuracy.
- the binder aqueous solution amount and the added water amount can be accurately adjusted in accordance with the raw material input amount and raw material moisture, which are the fluctuation factors, and the binder aqueous solution having the optimum concentration can be added.
- the binder aqueous solution having an inappropriate concentration remaining in the pipe 5 from being added to the raw material when the binder concentration is changed, and the binder concentration Even without using the static mixer 10 having low responsiveness to the change, the aqueous binder solution having a uniform concentration can be quickly generated using the mixing nozzle 70 having high responsiveness. Therefore, in this embodiment, when changing the concentration of the aqueous binder solution added to the raw material in accordance with the fluctuations in the raw material moisture and the raw material input amount, the concentration of the aqueous binder solution can be controlled quickly and with high accuracy. There is no time lag as in the method of FIG.
- the kneading machine 50 responds immediately to the raw material conveyance amount and raw material moisture that change from moment to moment, and the concentration and addition amount of the binder aqueous solution added to the iron ore raw material with high accuracy.
- the iron ore raw material and the binder aqueous solution can be kneaded while adjusting.
- the kneaded material manufactured by the kneading machine 50 can ensure proper granulation conditions without becoming a slurry due to excessive binder and without reducing granulation due to insufficient binder. Therefore, the granulation property in the granulation process by the subsequent granulators 24 and 35 can be improved, and the granulation quality can be kept uniform.
- the kneading and granulation process can be continued in a state where appropriate granulation conditions are maintained regardless of fluctuations in the raw material transport amount and raw material moisture, which causes equipment stop troubles and the like. Therefore, it is possible to accurately handle changes in raw material moisture and changes in raw material throughput. As a result, it is possible to stably produce a high-quality granulated product, and to stabilize the sintering production process in the sintering machine 40.
- the aqueous binder solution is directly sprayed from the mixing nozzle 70 to the iron ore raw material 57 before being put into the kneading machine 50, not from the body 52 of the kneading machine 50. . Therefore, even if the fixing layer 4 (see FIG. 1) is formed on the inner peripheral surface of the body portion 52 of the kneader 50, the fixing layer 4 can prevent the binder from being hindered, and before the charging, Since a binder aqueous solution having a uniform concentration can be uniformly added to the iron ore raw material 57, uniform kneading in the kneader 50 is possible.
- the residence time of the iron ore raw material in the kneader 50 is usually a short time of about 3 minutes at the longest, and a uniform aqueous binder solution is uniformly mixed in the entire iron ore raw material in this short time. It is necessary to let In this embodiment, when adding the binder aqueous solution in the kneader 50, the binder aqueous solution having a uniform concentration is mixed by the mixing nozzle 70 while being uniformly sprayed over the entire iron ore raw material to be charged. Even within the above short time, the binder aqueous solution and the iron ore raw material can be sufficiently mixed.
- the binder addition method of Patent Document 1 the binder and the added water are separately sprayed in the granulator (drum mixer), but when the binder and the added water are sprayed separately, a uniform concentration binder is used as a raw material. It cannot be added uniformly.
- the binder addition method according to the present embodiment can be suitably applied to the kneader 50 for sufficiently kneading the iron ore raw material mainly composed of fine powder as the previous stage of the granulation step.
- the binder used in the present embodiment used a polyacrylic acid-based dispersant capable of maintaining high dispersibility of fine powder (fine particles) in the iron ore raw material in order to improve granulation.
- the binder addition method according to the present embodiment can be suitably applied to a binder (granulating agent) containing such a polyacrylic acid-based dispersant. That is, since a binder having a uniform concentration can be uniformly added to the raw material, the effect of dispersing fine powder of the iron ore raw material with the binder and adhering the fine powder around the core particles (coarse particles) can be enhanced.
- the iron ore raw material containing fine powder can be suitably granulated (pseudo-particle or pelletized), and a granulated product having an appropriate particle size (for example, a particle size of about several mm to 10 mm) can be preferably produced.
- the binder addition apparatus and the addition method of the present invention are applied to the kneaders 23 and 34 provided in the pseudo granulation line 20 and the pellet granulation line 30 of the sintering facility shown in FIG.
- the present invention is not limited to such an example.
- the binder addition apparatus and addition method of the present invention can be applied to any kneading machine for kneading iron making raw materials such as iron ore raw materials, in addition to the kneading machines 23 and 34.
- the binder stock solution and the added water are mixed by the mixing nozzle 70 to generate a binder aqueous solution having a desired concentration.
- the binder solution diluted in advance to a predetermined concentration and water are mixed.
- a binder aqueous solution having a desired concentration may be produced.
- the structure of the mixing nozzle 70 is not limited to the example shown in FIGS. 6 and 7, and the design can be changed to any structure as long as the binder and the added water can be mixed uniformly.
- Example 1 As shown in FIG. 5, the Example using the kneading machine provided with the binder addition apparatus and using the mixing nozzle shown in FIG. 6 is shown below. Granulation was performed using an average of 200 dry-ton / h of the iron ore raw material charged into the pellet granulation line, an average of 8% of the raw material water ratio, and a polyacrylic acid-based dispersant as a binder. (Here, the iron ore raw material and the raw material moisture ratio are shown as average values, as described above, although the iron ore raw material is quantitatively cut out from the raw material tank, there is actually a slight amount of fluctuation.
- Example 2 Except for using the mixing nozzle shown in FIG. 7 in the present invention, even when tested under the same conditions as in Example 1, similarly, even when the binder solid content ratio Rs is a high concentration of 0.2%, the slurry The operation could be continued stably, and the granulated product with an appropriate particle size and strength could be produced.
- the iron ore raw material charged into the pellet granulation line has an average of 200 dry-ton / h, the raw material moisture ratio of 8% on average, and a polyacrylic acid-based dispersion as a binder.
- Granulation was performed using an agent.
- the binder solid content ratio Rs is 0.1%, there are many serious troubles due to the generation of slurry, and the delay in controlling the binder concentration due to the aqueous binder solution remaining in the pipe is an important problem.
- the present invention can be used in the granulation process of the iron ore raw material in the steel manufacturing process can be understood from the above detailed explanation taking the granulation of the iron ore raw material as an example. Furthermore, the present invention is not limited to the granulation of iron ore raw materials, but can be applied to the granulation of other materials.
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Abstract
Description
また、特許文献3には、造粒機において造粒処理剤を鉄鉱石原料中に均一に混合するため、造粒処理剤と添加水を予め混合し、その混合液を造粒機内に散布し、鉄鉱石原料と混合させる方法が提案されている。
この方法では、流量調整弁11と電磁流量計12を用いて、配管13を流れるバインダー原液の流量を制御するとともに、流量調整弁14と電磁流量計15を用いて、配管16を流れる添加水の流量を制御することで、スタティックミキサー10にて両者を混合して、規定濃度のバインダー水溶液を生成し、当該バインダー水溶液を1本の配管5で混練機1に供給することができる。
また、粘度の高いバインダーと添加水を均一に混合するため、噴霧した添加水をバインダーに衝突接触させることにより、均一に混合されたバインダー水溶液を得ることができることを見出した。
本発明のある観点によれば、鉄鉱石原料の造粒において、バインダー供給配管及び水供給配管により個別に供給されるバインダーと水を混合すると共に出側が解放されている混合ノズルを、鉄鉱石原料の混練機の原料投入部付近に設置し、前記混合ノズルから、前記バインダーと前記水とが混合されたバインダー水溶液を、前記混練機の原料投入部に投入される鉄鉱石原料に対して散布することを特徴とする、バインダー添加方法が提供される。
図2は、スタティックミキサーを用いたバインダー添加方法を示す模式図である。
図3は、スタティックミキサーを用いたバインダー添加方法の変更例を示す模式図である。
図4は、本発明の第1の実施形態に係る混練機を備えた焼結設備を示す模式図である。
図5は、同実施形態に係るバインダー添加装置を備えた混練機を示す模式図である。
図6は、同実施形態に係るバインダー添加装置の混合ノズルを示す模式図である。
図7は、同実施形態の変更例に係るバインダー添加装置の混合ノズルを示す模式図である。
まず、図4を参照して、本発明の第1の実施形態に係るバインダー添加装置を備える混練機が適用された焼結設備の全体構成について説明する。図4は、本実施形態に係るバインダー添加装置を備える混練機が適用された焼結設備の全体構成を示す模式図である。
すなわち、以上のような鉄鉱石原料は、その鉱種や粒度に応じて分類され、擬似造粒ライン20及びペレット造粒ライン30という2系統の造粒ラインでそれぞれ造粒(擬似粒子化又はペレット化)されて、焼結原料ペレットと擬似造粒物が製造される。以下に各造粒ラインについて詳述する。
次に、本実施形態に係るバインダー添加方法の詳細説明に先立ち、混練機にバインダーを添加する際にバインダー濃度を高精度かつ迅速に制御する必要性を、上記図2及び図3に示したバインダー添加方法の例を用いて検証した結果について説明する。
表1及び表2にその結果を示す。表1は、当該バインダー添加方法において、混練機1に投入される鉄鉱石原料に占める水分の割合(原料水分割合)が、8.5質量%から8.0質量%に低下した場合に、原料中のバインダー固形分の適正値からのずれを検証した結果を表す。表2は、原料水分割合が、8.0質量%から8.5質量%に上昇した場合に、原料中のバインダー固形分の適正値からのずれを検証した結果を表す。なお、かかる検証では、図2のバインダー添加方法において、配管5として、長さ20mの配管50Aを使用した。
バインダー原液中の固形分の質量 :SB(ton)
添加水の質量 :WW(ton)
混練機に投入される前の原料水分の質量 :WF(ton)
混練機に投入される前の鉄鉱石原料の質量 :SF(dry−ton)
CB={SB/(SB+WB+WW)}×100
バインダー水溶液添加量Tは、鉄鉱石原料に添加されるバインダー水溶液の質量であり、次の式で表される。
T=SB+WB+WW
バインダー固形分比RSは、鉄鉱石原料の質量SFに対する、バインダー原液中の固形分の質量SBの割合(質量%)であり、次の式で表される。
RS={SB/SF}×100
原料水分割合RW0は、鉄鉱石原料と原料水分の全質量(SF+WF)に対する、原料水分の質量WFの割合(質量%)であり、次の式で表される。
RW0={WF/(SF+WF)}×100
混合後原料水分割合RW1は、バインダー水溶液と鉄鉱石原料を混合した後の全質量に対する、全水分の質量の割合(質量%)であり、次の式で表される。
RW1={(WF+WB+WW)/(SF+SB+WF+WB+WW)}×100
図2に示したバインダー添加方法では、表1に示すように、原料水分割合RW0が8.5質量%から8.0質量%に低下した場合には、配管5内に残存するバインダー水溶液のバインダー濃度CB(14.1質量%)が、低下後の原料水分割合(8.0質量%)に対する最適濃度CB(7.7質量%)に比べて高くなる。このため、当該配管5内に残存する高濃度のバインダー水溶液が原料に添加される期間Aでは、最適値SBの約1.9倍ものバインダー中固形分SB’が、混練機1内の鉄鉱石原料に対して供給されるので、混練においてバインダー濃度が高くなり過ぎる。この結果、バインダーが供給過剰となり、混練物がスラリー化してしまうので、混練物の造粒性が低下する、或いは、混練物を搬送できない等といった、重大な影響を及ぼすこととなる。
次に、図5を参照して、本発明の一実施形態に係るバインダー添加装置と、これを用いたバインダー添加方法について説明する。図5は、本実施形態に係るバインダー添加装置を備えた混練機を示す模式図である。なお、図5に示す混練機50は、図4に示した焼結設備の擬似造粒ライン20、ペレット造粒ライン30に設けられた混練機23、34に適用可能である。
そこで、混練機50に投入する前に、例えば、ベルトスケール等の測定手段によって搬送部56(ベルトコンベヤ等)による原料投入量を測定し、その測定値に合わせて、バインダー原液量および添加水量を精度良く制御することも可能となる。
次に、図6を参照して、上記本実施形態に係るバインダー添加方法を好適に実現するための混合ノズル70の具体的構成について詳細に説明する。図6は、本実施形態に係るバインダー添加装置の混合ノズル70の構成例を示す縦断面図である。
かかる配置により、内ノズル72のノズル口75から添加水Wが、下方に向けて、外ノズル71の内側に拡散・噴霧されて、外ノズル71の内面に沿って垂れ落ちるバインダー原液Bに衝突・混合されるようになっている。噴霧された添加水Wをバインダーと衝突・混合させることにより、均一に添加水中にバインダーを混合することができる。これにより、より均一に外ノズル71内にバインダーを供給できる。
以上、本実施形態に係る混練機50に適用されるバインダー添加装置及びバインダー添加方法について詳述した。本実施形態によれば、混練機50の原料投入部55付近(バインダーの添加位置)に混合ノズル70を配置し、バインダー原液と添加水を別々の配管63、66を用いて、それぞれの流量を高精度に制御した状態で混合ノズル70まで供給する。そして、混合ノズル70によって、バインダー原液と添加水を混合してバインダー水溶液を生成して、混練機50に投入される鉄鉱石原料57に対してバインダー水溶液を直接的に添加する。
図5に示すように、バインダー添加装置を備えた混練機を用い、図6に示す混合ノズルを用いた実施例を以下に示す。ペレット造粒ラインに投入する鉄鉱石原料を平均200dry−ton/h、原料水分割合が平均8%、バインダーとしてポリアクリル酸系の分散剤を用い造粒を行った。(ここで、鉄鉱石原料および原料水分割合をそれぞれ平均値で示しているのは、前述しているように、鉄鉱石原料が原料槽から定量切出しされるものの実際には若干量の変動が生じること、原料水分については、保管状態や天候、原料配合比等により変動するためである。)
この条件で、造粒を行った結果、図3に示す既存設備において発生していた配管内に残存するバインダー水溶液を原因とするバインダー濃度の制御遅延が解消され、設定値通りに供給できる。このため、バインダー固形分比Rsが0.2%の高濃度においても、安定して操業が継続でき、適切な粒度と強度の造粒物を製造できた。
本発明における図7に示す混合ノズルを用いたこと以外は、実施例1と同じ条件で試験した場合においても、同様に、バインダー固形分比Rsが、0.2%の高濃度においても、スラリーの発生もなく、安定して操業を継続でき、適切な粒度と強度の造粒物を製造できた。
図3に示す既存設備にて、実施例1と同様に、ペレット造粒ラインに投入する鉄鉱石原料を平均200dry−ton/h、原料水分割合が平均8%、バインダーとしてポリアクリル酸系の分散剤を用い造粒を行った。この場合、バインダー固形分比Rsが0.1%でもスラリー発生による重大トラブルが幾度もあり、配管内に残存するバインダー水溶液を原因とするバインダー濃度の制御遅延は重要な問題であった。
23、34、50 混練機
52 胴部
53 撹拌羽根
54 回転軸
55 原料投入部
56 搬送部
57 鉄鉱石原料
61 流量調整弁
62 電磁流量計
63 バインダー供給配管
64 流量調整弁
65 電磁流量計
66 水供給配管
70 混合ノズル
71、81 外ノズル
72、82 内ノズル
74 流入口
75、85 ノズル口
76、86 ノズル口
84 開口
87 接続管
88 フランジ
90 噴霧ノズル
B バインダー原液
W 添加水
M バインダー水溶液
Claims (14)
- 鉄鉱石原料の造粒において、バインダー供給配管及び水供給配管により個別に供給されるバインダーと水を混合すると共に出側が開放されている混合ノズルを、鉄鉱石原料の混練機の原料投入部付近に設置し、前記混合ノズルから、前記バインダーと前記水とが混合されたバインダー水溶液を、前記混練機の原料投入部に投入される鉄鉱石原料に対して散布することを特徴とする、バインダー添加方法。
- 前記混合ノズルは、外ノズルと、前記外ノズル内に配設された内ノズルとからなる二重構造であり、前記外ノズル又は前記内ノズルの一方に前記バインダー供給配管が接続され、その他方のノズルに前記水供給配管が接続されており、前記バインダー供給配管により前記外ノズル内に供給される前記バインダーに対して、前記水供給配管により供給される前記水を噴霧することにより、前記外ノズル内で前記バインダーと前記水とを混合して前記バインダー水溶液を生成し、前記外ノズルのノズル口から前記バインダー水溶液を前記鉄鉱石原料に対して散布することを特徴とする、請求項1に記載のバインダー添加方法。
- 前記バインダー供給配管は、前記外ノズルの側面に貫通形成された流入口に接続され、前記水供給配管は、前記内ノズルに連通するよう接続されており、前記外ノズルの前記流入口から前記外ノズル内に吐出された前記バインダーに対し、前記内ノズルのノズル口から前記水を噴霧することによって、前記バインダーに前記水を混合して前記バインダー水溶液を生成することを特徴とする、請求項2に記載のバインダー添加方法。
- 前記水供給配管は、前記外ノズルの側面に貫通形成された開口に接続され、前記バインダー供給配管は、前記内ノズルに連通するよう接続されており、前記内ノズルのノズル口から前記外ノズル内に吐出された前記バインダーに対し、前記外ノズルの前記開口から前記水を噴霧することによって、前記バインダーに前記水を混合して前記バインダー水溶液を生成することを特徴とする、請求項2に記載のバインダー添加方法。
- 前記バインダーは、ポリアクリル酸系の分散剤であることを特徴とする、請求項1~4のいずれか1項に記載のバインダー添加方法。
- 前記鉄鉱石原料が含有する水分又は前記混練機に対する前記鉄鉱石原料の投入量に応じて、前記バインダー供給配管又は前記水供給配管のうち少なくともいずれか一方の流量を制御することを特徴とする、請求項1~5のいずれか1項に記載のバインダー添加方法。
- 鉄鉱石原料の造粒機において、バインダーを供給するバインダー供給配管と、水を供給する水供給配管とが、鉄鉱石原料の混練機の原料投入部付近に設置され、前記バインダー供給配管及び前記水供給配管により個別に供給される前記バインダーと前記水を混合すると共に出側が開放されている混合ノズルと、を備え、前記混合ノズルは、前記バインダーと前記水とを混合して生成したバインダー水溶液を、前記混練機の原料投入部に投入される鉄鉱石原料に対して散布することを特徴とする、バインダー添加装置。
- 前記混合ノズルは、外ノズルと、前記外ノズル内に配設された内ノズルとからなる二重構造であり、前記外ノズル又は前記内ノズルの一方に前記バインダー供給配管が接続され、その他方のノズルに前記水供給配管が接続されており、前記バインダー供給配管により前記外ノズル内に供給される前記バインダーに対して、前記水供給配管により供給される前記水を噴霧することにより、前記外ノズル内で前記バインダーと前記水とを混合して前記バインダー水溶液を生成し、前記外ノズルのノズル口から前記バインダー水溶液を前記鉄鉱石原料に対して散布することを特徴とする、請求項7に記載のバインダー添加装置。
- 前記バインダー供給配管は、前記外ノズルの側面に貫通形成された流入口に接続され、前記水供給配管は、前記内ノズルに連通するよう接続されており、前記外ノズルの前記流入口から前記外ノズル内に吐出された前記バインダーに対し、前記内ノズルのノズル口から前記水を噴霧することによって、前記バインダーに前記水を混合して前記バインダー水溶液を生成することを特徴とする、請求項8に記載のバインダー添加装置。
- 前記水供給配管は、前記外ノズルの側面に貫通形成された開口に接続され、前記バインダー供給配管は、前記内ノズルに連通するよう接続されており、前記内ノズルのノズル口から前記外ノズル内に吐出された前記バインダーに対し、前記外ノズルの前記開口から前記水を噴霧することによって、前記バインダーに前記水を混合して前記バインダー水溶液を生成することを特徴とする、請求項8に記載のバインダー添加装置。
- 前記バインダーは、ポリアクリル酸系の分散剤であることを特徴とする、請求項7~10のいずれか1項に記載のバインダー添加装置。
- 前記鉄鉱石原料が含有する水分又は前記混練機に対する前記鉄鉱石原料の投入量に応じて、前記バインダー供給配管又は前記水供給配管のうち少なくともいずれか一方の流量を制御する制御部を更に備えることを特徴とする、請求項7~11のいずれか1項に記載のバインダー添加装置。
- 請求項7~12のいずれか1項に記載のバインダー添加装置を備えることを特徴とする、混練機。
- 請求項7~12のいずれか1項に記載のバインダー添加装置を用いて、混練機の原料投入部に投入される鉄鉱石原料に対してバインダー水溶液を散布しながら、前記混練機内で前記鉄鉱石原料を混練することを特徴とする、混練方法。
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CN115427591A (zh) * | 2020-04-15 | 2022-12-02 | 杰富意钢铁株式会社 | 烧结矿的制造方法 |
EP4137594A4 (en) * | 2020-04-15 | 2023-05-24 | JFE Steel Corporation | PROCESS FOR MAKING SINTERED ORE |
CN115427591B (zh) * | 2020-04-15 | 2024-06-25 | 杰富意钢铁株式会社 | 烧结矿的制造方法 |
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CN102378820B (zh) | 2017-06-20 |
KR20110122760A (ko) | 2011-11-10 |
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JPWO2010114152A1 (ja) | 2012-10-11 |
BRPI1012754B1 (pt) | 2017-12-05 |
CN102378820A (zh) | 2012-03-14 |
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BRPI1012754A2 (pt) | 2016-04-05 |
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