WO2019167888A1 - 造粒焼結原料の製造方法 - Google Patents
造粒焼結原料の製造方法 Download PDFInfo
- Publication number
- WO2019167888A1 WO2019167888A1 PCT/JP2019/007079 JP2019007079W WO2019167888A1 WO 2019167888 A1 WO2019167888 A1 WO 2019167888A1 JP 2019007079 W JP2019007079 W JP 2019007079W WO 2019167888 A1 WO2019167888 A1 WO 2019167888A1
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- WIPO (PCT)
- Prior art keywords
- raw material
- sintered
- granulated
- steam
- temperature
- Prior art date
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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
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
- C22B1/205—Sintering; Agglomerating in sintering machines with movable grates regulation of the sintering process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
-
- 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
- B01J2/12—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic in rotating drums
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B2005/005—Selection or treatment of the reducing gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
Definitions
- the present invention relates to a method for producing a granulated and sintered raw material, and in particular, through the development of a granulated and sintered raw material effective for reducing the size of a wet band appearing in a raw material charging layer on a sintering machine pallet, This is a proposal for a method that contributes to improving the productivity of sintered ore obtained using this raw material.
- Patent Document 1 water and a binder are added to a sintering raw material containing carbonaceous material, granulated, and then the granulated and sintered raw material obtained by drying with a rotary kiln is charged onto a pallet and sintered.
- a method for producing a sintered ore is disclosed.
- special equipment called a rotary kiln is required to dry the granulated and sintered raw material using a rotor kiln or the like.
- a raw material for a blast furnace to be charged into a blast furnace that is, a lump ore is charged into a cooler attached to a sintering machine and the lump ore is dried in advance. That is, in this method, a blast furnace ore is charged at a place where the temperature in the cooling machine (cooler) of the sintering machine (temperature of the cooled sintered ore) reaches 300 to 600 ° C.
- a method of drying in advance is proposed.
- Patent Document 1 when improving the productivity of sintered ore, for example, in the method of preheating and drying the sintering compounded raw material (granulated sintered raw material) in advance (Patent Document 1), a new dedicated In addition to the need for equipment and increased equipment costs, there is a problem that fuel is required in addition to the aggregating material used in the sintering process, resulting in high costs.
- Patent Document 2 is a method in which the heat source of the sintering machine cooler is used for preheating the massive iron ore charged in the blast furnace. Therefore, this method controls the wet zone of the raw material charging layer on the pallet through improvement of the granulated sintered raw material itself, thereby improving the productivity of the sintered ore and improving the quality. It's not technology.
- the present invention solves the above-mentioned problems of the prior art, particularly by producing a granulated and sintered raw material that is heated to a certain temperature or higher using steam during granulation.
- the purpose of the present invention is to propose a novel method for producing a granulated and sintered raw material, which can improve air permeability and improve the productivity of sintered ore when charged in a sintering machine.
- steam such as water vapor is blown into a granulator such as a drum mixer, an Eirich mixer, or a pelletizer used for granulating a sintering compound raw material.
- a granulator such as a drum mixer, an Eirich mixer, or a pelletizer used for granulating a sintering compound raw material.
- the temperature is higher than the initial temperature of the sintered blended raw material before entering the drum mixer, for example, the temperature of the granulated sintered raw material is higher than the initial temperature, More preferably, as a thermal granulation raw material for sintering (granulation sintering raw material) raised to a temperature of 60 ° C. or higher, it was charged on a pallet of a sintering machine.
- a method for producing a granulated and sintered raw material characterized in that the raw material is a granulated and sintered raw material having a temperature 10 ° C. or more higher than the temperature before charging the blended raw material into the granulator.
- the steam has a superheat degree of 13.5 ° C. or less in the steam pipe, (2) Blowing steam into the granulator is performed in the first half part from the raw material charging position of the granulator to a substantially intermediate position in the length direction; (3) The amount of steam blown into the granulator is 3.0 kg / ts or more, (4) When the temperature of the granulated and sintered raw material discharged from the granulator exceeds 60 ° C., in addition to water introduced by blowing steam, water for factory use, hot water or condensed water is added. Adding moisture corresponding to 0.5 mass% or more and 3.0 mass% or less as moisture after granulation; Is more preferable.
- the initial temperature of the starting material is obtained by granulating by blowing steam such as water vapor into a granulator such as a drum mixer, an Eirich mixer, or a pelletizer. It is possible to produce granulated and sintered raw materials that are 10 ° C higher than the temperature of the raw materials), so when such granulated and sintered raw materials are charged onto the sintering machine pallet, the air permeability of the raw material charging layer is improved. As a result, the production rate of sintered ore can be improved.
- (a) is a schematic diagram which shows arrangement
- (b) is sectional drawing which shows the condition inside a drum mixer. It is a figure which shows the relationship between the water vapor
- the granulated and sintered raw material (pseudoparticles) charged on the sintering machine pallet for the production of sintered ore is generally iron ore powder or iron making having an average particle size of about 1.0 to 5.0 mm.
- Contaminated iron sources such as various dust generated in the plant, CaO-containing raw materials such as limestone and quicklime, steelmaking slag, condensates such as powdered coke and anthracite, MgO containing refined nickel slag, dolomite, serpentine, etc.
- raw material refining nickel slag, the sintered material compounding such Keiseki (silica sand) SiO 2 containing material and the like
- Keiseki silicon sand
- SiO 2 containing material and the like is first stored in a hopper, and the proportion from the hopper, a predetermined these sintering material on the conveyor
- the raw material is sintered and blended, and the mixture is put into the granulator, granulated by adding necessary humidity while stirring and mixing, and the average particle size is about 3.0 to 6.0 mm.
- Granulated and sintered raw material Pseudo particles).
- an Eirich mixer or a pelletizer can be used as described above, but preferably a drum as shown in FIG. A mixer is used, and a plurality of them may be used.
- a drum mixer an example of a drum mixer will be described as a granulator.
- the granulated and sintered raw material (pseudo particles) obtained by granulating with the drum mixer is generally placed on the sintering machine pallet via a charging device arranged on the sintering machine.
- a raw material charging layer is formed by charging and depositing to a thickness (height) of about 400 to 600 mm, and then this raw material charging is performed by an ignition furnace installed above the raw material charging layer.
- the charcoal material contained in the bed is ignited, and the charcoal material in the raw material charge layer is sequentially burned by the downward suction by the wind box disposed under the pallet, which is generated at this time.
- Sintering is performed by burning and melting the charged raw material (granulated sintered raw material) with combustion heat.
- the sintered layer (sintered cake) obtained on the pallet is sized with a sieve through a crusher and a cooler of a sinter, and is converted into a massive product sintered ore of 5 mm or more and a return ore of less than 5 mm. Separated and collected.
- the present invention relates to a method for producing a granulated sintered raw material (pseudo particle) which is a pretreatment step of a sintered raw material used in the above-described sintered ore manufacturing process. It is a figure explaining the aspect which manufactures this granulation sintering raw material 2 (granulation).
- the feature of the present invention is that, for example, steam is blown into the drum mixer 1 (injection) when the raw material is granulated by a granulator such as the drum mixer 1 that granulates the sintered blended raw material by rolling.
- the temperature is raised to a temperature at least 10 ° C. higher than the initial temperature of the sintered blending raw material when the drum mixer 1 is put into the interior (for example, the temperature on the drum mixer entrance side of the ambient temperature to about 35 ° C.).
- the granulated and sintered raw material 2 is heated (heated), preferably heated and humidified so that the temperature of the granulated and sintered raw material is about 45 ° C. to 70 ° C. is there.
- the amount of steam blown in order to raise the temperature to 10 ° C. or higher than the temperature of the raw material for sintering blended on the drum mixer inlet side is 3 kg / ts or more, preferably 4 kg / t ⁇ . It is desirable to blow an amount from s to about 25 kg / ts from a position described later. This blowing amount is an effective amount for improving the production rate of sintered ore through ensuring desirable moisture as a granulated sintering raw material and ensuring good air permeability of the raw material charging layer.
- FIG. 2 is a diagram showing the temperature change of the granulated and sintered raw material after granulation when the steam blowing time is changed.
- the temperature of the sintered compounding raw material is about a few tens of seconds longer than the temperature of the sintered compounding raw material immediately before being charged into the drum mixer.
- the temperature can be easily raised to about 45 ° C., preferably about 70 ° C., which is 10 ° C. or higher.
- the degree of superheat of steam in the steam pipe is low because the amount of steam that is not condensed and dissipated outside the drum mixer can be reduced, and the amount of steam used can be reduced.
- the superheat degree of water vapor is obtained by subtracting the saturated vapor temperature at the pressure from the vapor temperature.
- FIG. 3 is a diagram showing a change in moisture value of the granulated and sintered raw material on the drum mixer outlet side with respect to the temperature of the granulated and sintered raw material.
- the moisture when the temperature of the granulated and sintered raw material is around 60 ° C to 70 ° C, the moisture also rises due to the condensation of water vapor due to the temperature rise. It can be seen that the phenomenon starts and the evaporation of water from the so-called granulated and sintered raw material occurs. That is, when the opening degree of the steam pipe is 1/4, 2/4, 3/4, the larger the opening degree, the faster the moisture rises due to the temperature rise, but in our experiments, as shown in FIG.
- the temperature of the granulated and sintered raw material depends on the opening of the pipe, but when it reaches around 60-70 ° C, the moisture decreases, and it is considered that the temperature changes from humidification to drying near this temperature. .
- the amount of water condensed by blowing water vapor is taken into account,
- the water content is adjusted to be about 0.5 mass% to 3.0 mass% higher than the target water content (6.5 mass%) of the granulated and sintered raw material. It is preferable.
- the superheat degree of steam in the steam pipe exceeds 13.5 ° C, the amount of steam that is not condensed and dissipated outside the drum mixer increases, and at the same time, the moisture rise in the granulated and sintered raw material due to the condensed water is suppressed. There was a tendency to be. Therefore, if the superheat degree of the steam in the steam pipe is 13.5 ° C. or less, the condensation is promoted in the steam drum mixer, the amount of steam used can be reduced, and at the same time, the moisture content of the granulated sintered raw material is increased by the condensed water. This is desirable because moisture adjustment is easier.
- FIG. 4 is a diagram showing the influence of when steam is blown in the first half of the drum mixer and when steam is blown in the entire area of the drum mixer.
- the harmonic mean diameter of the pseudo particles is maximized in the vicinity of 7 to 8 mass% where the granulated and sintered raw material has an appropriate water content. From this, the position where steam is blown into the drum mixer is superior in terms of the granulation effect because the harmonic average diameter of the granulated and sintered raw material (pseudoparticles) becomes larger when blown in the first half. I understand that.
- the first half means from the raw material charging position of the granulator to the approximately middle position in the length direction.
- Table 1 shows an example in which an example suitable for the method of the present invention is compared with a comparative example according to the conventional method.
- These examples are comparative examples 1 in which water vapor is not blown into the drum mixer (however, this example is CaO added as a binder ( ⁇ 2 mass%) with respect to the compounded sintered raw material before charging the drum mixer: 35 ° C.
- the temperature of the granulated and sintered raw material is 42.5 ° C. due to the heat generated when CaOH 2 reacts with water to produce CaOH 2 (increase of + 7.5 ° C .: common to all examples)
- the air permeability index and the production rate are compared.
- Example 2 In Comparative Example 2, the addition of a very small amount of water vapor (1.9 kg / ts) stopped the temperature of the granulated and sintered raw material from increasing to 4.8 ° C., less than 10 ° C. The effect is not evident. On the other hand, in Example 1, since the increase in the temperature of the granulated and sintered raw material reached 56.0 ° C., which is 10 ° C. or higher, a clear effect was revealed in terms of air permeability index and production rate, and the temperature increase was about 35 ° C. Even in the case of Example 2, the great effect is obtained.
- Example 3 is an example in which water vapor was blown into the first half of the drum mixer (0.5 from the entry side from the raw material charging position of the granulator when the total length of the granulator is 1).
- the harmonic average diameter of the granulated and sintered raw material is increased, and a great improvement effect is obtained in terms of air permeability index and production rate.
- the amount of steam blown to make a granulated and sintered raw material having an outlet side temperature higher by 10 ° C. or more than the inlet side temperature of the drum mixer is 3 kg / ts or more, preferably 4 kg / t ⁇ . It is considered effective to secure s or more.
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Abstract
Description
(1)前記水蒸気は、水蒸気配管内での過熱度が13.5℃以下であること、
(2)前記造粒機内への水蒸気の吹き込みは、該造粒機の原料投入位置から長さ方向の略中間の位置までの前半部分において行なうこと、
(3)前記造粒機内への水蒸気の吹き込み量が3.0kg/t-s以上であること、
(4)前記造粒機から排出される造粒焼結原料の温度が60℃を超えたとき、水蒸気の吹き込みによって投入される水分に加え、さらに工場用水や熱水あるいは凝縮水を添加して造粒後水分にして0.5mass%以上、3.0mass%以下に相当する水分を加えること、
がより好ましい。
2 造粒焼結原料
Claims (5)
- 鉄鉱石粉の他、炭材や副原料を配合してなる焼結配合原料を造粒機にて造粒する際に、該造粒機内に水蒸気を吹き込むことにより、前記焼結配合原料の当該造粒機内への装入前の温度よりも10℃以上高い温度の造粒焼結原料とすることを特徴とする造粒焼結原料の製造方法。
- 前記水蒸気は、水蒸気配管内での過熱度が13.5℃以下であることを特徴とする請求項1に記載の造粒焼結原料の製造方法。
- 前記造粒機内への水蒸気の吹き込みは、該造粒機の原料投入位置から長さ方向の略中間の位置までの前半部分において行なうことを特徴とする請求項1または2に記載の造粒焼結原料の製造方法。
- 前記造粒機内への水蒸気の吹き込み量が3.0kg/t-s以上であることを特徴とする請求項1~3のいずれか1に記載の造粒焼結原料の製造方法。
- 前記造粒機から排出される造粒焼結原料の温度が60℃を超えたとき、水蒸気の吹き込みによって投入される水分に加え、さらに工場用水や熱水あるいは凝縮水を添加して造粒後水分にして0.5mass%以上、3.0mass%以下に相当する水分を加えることを特徴とする請求項1~4のいずれか1に記載の造粒焼結原料の製造方法。
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2019228862A AU2019228862B2 (en) | 2018-02-28 | 2019-02-25 | Method for Manufacturing Granulated Raw Material for Sintering |
EP19761292.2A EP3760747B1 (en) | 2018-02-28 | 2019-02-25 | Method for manufacturing granulated raw material for sintering |
CN201980012782.1A CN111699272A (zh) | 2018-02-28 | 2019-02-25 | 造粒烧结原料的制造方法 |
BR112020017371-1A BR112020017371B1 (pt) | 2018-02-28 | 2019-02-25 | Método de fabricação de matéria-prima granulada para sinterização |
KR1020207022713A KR102431895B1 (ko) | 2018-02-28 | 2019-02-25 | 조립 소결 원료의 제조 방법 |
JP2020503495A JP6897859B2 (ja) | 2018-02-28 | 2019-02-25 | 造粒焼結原料の製造方法 |
RU2020131562A RU2765204C1 (ru) | 2018-02-28 | 2019-02-25 | Способ изготовления гранулированного материала исходного сырья для спекания |
PH12020551344A PH12020551344A1 (en) | 2018-02-28 | 2020-08-27 | Method for manufacturing granulated raw material for sintering |
Applications Claiming Priority (2)
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JP2018035688 | 2018-02-28 | ||
JP2018-035688 | 2018-02-28 |
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WO2019167888A1 true WO2019167888A1 (ja) | 2019-09-06 |
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PCT/JP2019/007079 WO2019167888A1 (ja) | 2018-02-28 | 2019-02-25 | 造粒焼結原料の製造方法 |
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EP (1) | EP3760747B1 (ja) |
JP (1) | JP6897859B2 (ja) |
KR (1) | KR102431895B1 (ja) |
CN (1) | CN111699272A (ja) |
AU (1) | AU2019228862B2 (ja) |
PH (1) | PH12020551344A1 (ja) |
RU (1) | RU2765204C1 (ja) |
WO (1) | WO2019167888A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020115959A1 (ja) * | 2018-12-07 | 2020-06-11 | Jfeスチール株式会社 | 焼結鉱の製造方法 |
WO2023210411A1 (ja) * | 2022-04-28 | 2023-11-02 | Jfeスチール株式会社 | 造粒装置、造粒焼結原料の製造方法および焼結鉱の製造方法 |
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-
2019
- 2019-02-25 EP EP19761292.2A patent/EP3760747B1/en active Active
- 2019-02-25 WO PCT/JP2019/007079 patent/WO2019167888A1/ja unknown
- 2019-02-25 KR KR1020207022713A patent/KR102431895B1/ko active IP Right Grant
- 2019-02-25 JP JP2020503495A patent/JP6897859B2/ja active Active
- 2019-02-25 CN CN201980012782.1A patent/CN111699272A/zh active Pending
- 2019-02-25 AU AU2019228862A patent/AU2019228862B2/en active Active
- 2019-02-25 RU RU2020131562A patent/RU2765204C1/ru active
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2020
- 2020-08-27 PH PH12020551344A patent/PH12020551344A1/en unknown
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JPS59229423A (ja) * | 1983-06-09 | 1984-12-22 | Sumitomo Metal Ind Ltd | 焼結鉱の製造方法 |
JPH0711348A (ja) * | 1993-06-28 | 1995-01-13 | Nippon Steel Corp | 焼結操業方法 |
JP2007169780A (ja) | 2005-11-25 | 2007-07-05 | Jfe Steel Kk | 焼結鉱の製造方法 |
JP2013119667A (ja) | 2011-12-09 | 2013-06-17 | Jfe Steel Corp | 鉱石事前処理方法 |
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Title |
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See also references of EP3760747A4 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2020115959A1 (ja) * | 2018-12-07 | 2020-06-11 | Jfeスチール株式会社 | 焼結鉱の製造方法 |
WO2023210411A1 (ja) * | 2022-04-28 | 2023-11-02 | Jfeスチール株式会社 | 造粒装置、造粒焼結原料の製造方法および焼結鉱の製造方法 |
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JPWO2019167888A1 (ja) | 2020-12-03 |
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