WO2020137484A1 - 焼結鉱の製造方法 - Google Patents
焼結鉱の製造方法 Download PDFInfo
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- WO2020137484A1 WO2020137484A1 PCT/JP2019/048041 JP2019048041W WO2020137484A1 WO 2020137484 A1 WO2020137484 A1 WO 2020137484A1 JP 2019048041 W JP2019048041 W JP 2019048041W WO 2020137484 A1 WO2020137484 A1 WO 2020137484A1
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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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- the present invention is a method for producing a sintered ore that is a raw material for a blast furnace, in particular, a point at which a sintered ore is produced by using a sintering raw material produced by focusing on the particle characteristics of the sintering raw material used for granulation.
- the present invention relates to a method for producing a sinter having characteristics.
- Sinter ore is usually manufactured by the following process.
- powdered iron ore (generally called a sinter feed of about -10 mm) consisting of multiple types of brands, auxiliary powders such as limestone, silica stone, and serpentinite, and dust, scale, return ore, etc.
- An appropriate amount of miscellaneous raw material powder and solid fuel such as powder coke are mixed to obtain a sintering compound raw material.
- water is added to the obtained sintering compound material.
- the sintering compound raw material to which water is added is mixed and granulated to obtain a granulation raw material for sintering.
- the obtained granulation raw material for sintering is charged into a sintering machine and fired to obtain a sintered ore.
- the sintering compounding raw material generally contains water to aggregate with each other at the time of granulation to form pseudo particles. And, this pseudo-granulated sintering granulation raw material, when loaded on the pallet of the sintering machine, helps to ensure good ventilation of the sintering raw material charging layer, and facilitates the sintering reaction. Proceed to.
- Patent Document 1 discloses a method for producing a sintered ore in which a porous iron ore among sintering raw materials is pulverized to a particle size containing 15% or more of fine powder having a particle size of 45 ⁇ m or less.
- Patent Document 2 discloses a method for producing a sintered ore using a fine powder raw material including iron ore and a pellet feed, which are partially pulverized to have a particle size of 10 ⁇ m or less and whose particle size is adjusted.
- Patent Document 3 discloses a pretreatment method for a sintering raw material in which fine particles having a particle size of 10 ⁇ m or less are added and kneaded when the sintering raw material is kneaded.
- Patent Document 4 discloses a method for producing a sintering raw material, which is obtained by granulating a pellet feed by a vertical pulverizer having a predetermined configuration, and including ultrafine particles having a particle diameter of 10 ⁇ m or less as a part thereof.
- the particle size in the present embodiment is a particle size screened by using a sieve having a nominal mesh according to JIS (Japanese Industrial Standard) Z8801-1.
- the particle size of 4 mm or less is It refers to the particle size that the entire amount passes through a sieve with a nominal opening of 4 mm according to JIS Z 8801-1, and is also referred to as -4 mm.
- the minimum value of the nominal aperture defined by JIS (Japanese Industrial Standard) Z 8801-1 is 20 ⁇ m, and if it is smaller than that, for example, 10 ⁇ m or less, the laser diffraction/scattering method based on JIS Z 8825 is used.
- An object of the present invention is to reduce the productivity of sinter ore after sintering even in the case of granulating a sintering compounding raw material and improving the granulation property by adding an ultrafine powder material to the sintering compounding raw material.
- the object of the present invention is to propose a method for producing a sintered ore capable of preventing the above.
- the inventors optimized the addition amount of the ultrafine powder raw material to be added to the sintering compound raw material, and burned the pseudo particles coated with powder coke.
- the present invention was developed with the finding that it is possible to prevent a decrease in the productivity of the sintered ore after sintering by using it as a binder granulation raw material.
- the sintering compounding raw material containing iron ore composed of a plurality of brands is granulated by a granulator, and the obtained granulating raw material for sintering is fired by a sintering machine.
- a method for producing a sintered ore for obtaining a slag an ultrafine powder raw material having a particle size of 10 ⁇ m or less is a majority, and the particle size of 10 ⁇ m or less in the total amount after compounding is increased by 1 to 10 mass%, and the sintering is performed.
- a method for producing a sintered ore characterized in that, when granulating a blended raw material, a powdered coke is added during the granulation of a sintered blended raw material other than the powdered coke with a granulator.
- an ultrafine powder raw material having a particle size of 10 ⁇ m or less is a majority, and the particle size of 10 ⁇ m or less in the total amount after compounding is increased by 1 to 10 mass%,
- the granulating property can be improved by the ultrafine powder raw material.
- the combustion of the powder coke can be promoted, and the productivity of the sintered ore can be improved.
- the cause of inhibiting combustion in sintering of the sintering compounding raw material is powder coke as a heat source in sintering. It was conceived to be a coating of ultrafine particles on.
- the ultrafine particles mean fine particles having a particle size of ⁇ 10 ⁇ m or less (here, a particle size of 10 ⁇ m or less), and are not specified by components or the like. Since these particles have a small particle size, they have a high specific surface area and are effective in increasing the number of contact points between the particles. Therefore, the ultrafine powder particles have high adhesiveness, and when added at the time of granulation, they have the effect of improving the granulation property.
- ultrafine particles can enter the open pores of other particles.
- the coke powder used in the present invention contains, for example, ⁇ 100 ⁇ m open pores at 0.54 cc/g and ⁇ 10 ⁇ m open pores at 0.11 cc/g. Therefore, since the ultrafine particles are fine particles of -10 ⁇ m or less, they easily enter these pores during granulation. Therefore, it is considered that the ultrafine particles enter the pores of the coke powder. It was found that the more coagulated powder coke burns, the more the coke powder is clogged with ultrafine particles, which inhibits combustion.
- the normal sintering compounded raw material may contain 10% or less of the ultrafine powder particles, but the sintering is performed by adding the ultrafine powder raw material containing a majority of the ultrafine powder particles. It was found that by increasing the ratio of the ultrafine powder particles to the total amount of the blended raw materials, the granulation property was further improved and at the same time the combustion was further hindered.
- the present invention has developed a technique for promoting combustion of powder coke by reducing contact between the ultrafine powder material and powder coke as much as possible during the granulation process. Specifically, the following process was developed to achieve the present invention. (1) By adding powder coke to the latter half of the granulation of the sintering compound material in which granulation is promoted by the ultrafine powder material, the sintering compound material containing the ultrafine powder material is coated with the powder coke. (2) In the latter half of granulation, a raw material (limestone or return ore) containing no ultrafine powder raw material is added (exterior), and then coke dust is externally added.
- a raw material limestone or return ore
- a feature of the present invention is to granulate a sintering compounded raw material in which an ultrafine powder material having a particle size of 10 ⁇ m or less is a majority amount and the particle size of 10 ⁇ m or less in the total amount after compounding is increased by 1 to 10% by mass. At this time, powder coke is added during granulation to coat the powder coke.
- the time from the addition of powder coke to the end of granulation of the sintering compounding raw material is 30 to 120 seconds. Further, it is preferable to coat the limestone or the return ore before adding the powdered coke, because the productivity in sintering can be improved.
- the exterior time of the powder coke is the time from the addition of the powder coke to the end of granulation. Sintering compounded raw materials are continuously charged into the granulator like a drum mixer, and when granulation is continuously performed, the residence time in the granulator may be obtained using tracer particles, The distance from the granulator outlet may be converted to time by observing the moving state of the sintering compounding raw material inside the granulator.
- FIG. 1 is a flow chart for explaining an example of each step in the method for producing a sintered ore of the present invention.
- a powdered iron ore composed of a plurality of brands, an ultrafine powder raw material, an auxiliary raw material powder such as limestone, silica stone, and serpentine, and a scale.
- miscellaneous raw material powder such as returned ore.
- the ultrafine powder particles in the ultrafine powder raw material are blended so as to be 1 to 10 mass% of the total amount after blending (step S1).
- powder coke as a solid fuel is also prepared (step S2).
- step S3 the fine iron ore, the ultrafine powder raw material, the auxiliary raw material powder, and the miscellaneous raw material powder prepared in step S1 are mixed in appropriate amounts to obtain a sintering mixed raw material.
- a sintering mixed raw material it is more preferable to mix and stir the raw materials blended in step S3 with a stirrer before the next step S4 to homogenize them.
- the obtained sintering compound raw material is mixed with the sintering compound raw material obtained by adding water if necessary, and granulated (step S4).
- the powder coke prepared in step S2 is added during the granulation of the sintering compound material other than the powder coke in step S4 by the granulator. At this time, it is preferable that the time from the addition of the powder coke to the end of the granulation of the sintering compounding raw material is 30 to 120 seconds. Then, a granulation raw material for sintering is obtained (step S5), and then the obtained granulation raw material for sintering is charged into a sintering machine and fired (step S6) to obtain a sintered ore. (Step S7). As shown in FIG. 4, the particles of the obtained sinter are sinter particles coated with powder coke.
- FIG. 2 is a flowchart for explaining another example of each step in the method for producing a sintered ore according to the present invention.
- Each step of the method for producing a sintered ore according to the present invention will be described with reference to FIG. 2.
- powdered iron ore composed of a plurality of brands, ultrafine powder raw materials, auxiliary raw material powders such as limestone, silica stone, and serpentine, and scales.
- miscellaneous raw material powder such as returned ore.
- the ultrafine powder particles in the ultrafine powder raw material are blended so as to be 1 to 10 mass% of the total amount after blending (step S1).
- limestone used for the exterior or a change is prepared separately (step S2).
- step S3 powder coke as a solid fuel is also prepared.
- step S4 fine iron ore, the ultrafine powder raw material, the auxiliary raw material powder, and the miscellaneous raw material powder prepared in step S1 are mixed in appropriate amounts to obtain a sintering mixed raw material (step S4).
- step S4 it is more preferable to mix and stir the raw materials mixed in step S4 with a stirrer before the next step S5 to homogenize them.
- step S5 the obtained sintering compounding raw material is mixed with the sintering compounding raw material obtained by adding water if necessary, and granulated (step S5).
- the limestone or return ore prepared in step S2 is added in the middle of granulating a sinter compound material other than limestone or return ore and powder coke in step S5, and then step S3
- the powdered coke prepared in step 5 is added (step S5).
- the time from the addition of the powder coke to the end of the granulation of the sintering compounding raw material is 30 to 120 seconds.
- the limestone or the return ore is added after the start of the granulation of the powdered coke and the sinter compounding raw material other than the limestone or the return ore and before the addition of the powder coke.
- a granulation raw material for sintering is obtained (step S6), and then the obtained granulation raw material for sintering is charged into a sintering machine and fired (step S7) to obtain a sintered ore. (Step S8).
- the particles of the obtained sintered ore are, as shown in FIG. 5, sinter ore particles in which limestone or return ore is packaged and powder coke is packaged thereon.
- Test 1 and Test 2 were carried out, and the constitutions essential to the method for producing a sintered ore according to the present invention and the preferable constitutions were examined.
- ⁇ Test 1> (Regarding the effect of powder coke exterior)
- the exterior effect of the powder coke when the ultrafine powder raw material was added was evaluated.
- 99.9% or more of the ultrafine powder raw material has a particle diameter of 10 ⁇ m or less
- 4% of the raw materials other than the ultrafine powder raw material has a particle diameter of 10 ⁇ m or less.
- the samples of Comparative Examples and Examples (basicity, SiO 2 : 5% constant) shown in Tables 1-1 and 1-2 below have the compounding compositions shown in Tables 1-1 and 1-2.
- a sintering compounding raw material and water (water content at which the granulated product became 7.5%) were put into a drum mixer, and granulation was performed for a total of 5 minutes to prepare a sintering granulation raw material. Then, the granulation raw material for sintering was fired using a pan tester.
- sinter productivity when the sinter cake after sintering is dropped from a height of 2 m once, the product with a particle size of +10 mm is used as the product, and its weight is (sinter cake weight-bed mat weight). The value divided by was taken as the yield.
- the sintering production rate (t/h/m 2 ) was a value obtained by dividing the product weight by the firing time and the cross-sectional area of the test pot.
- Test 1 The results of Test 1 are shown in Table 1-1 and Table 1-1 below. Further, FIG. 5 shows a graph showing the relationship between the production rate and the packaging time from the data of Table 1-1 and Table 1-2, and FIG. 6 shows the graph of the data of Table 1-1 and Table 1-2. 3 is a graph showing the relationship between the comparative production rate with the ultrafine powder raw material of 0 mass% and the exterior time.
- Table 1-1 and Table 1-2 show that sintering coke obtained by adding coke powder during exterior time of 30 to 120 seconds during granulation of sintering compounded raw material containing 1 to 10 mass% of ultrafine powder raw material. It was found that the productivity of the sintered ore is improved when the granular raw material is sintered to obtain the sintered ore.
- the exterior time of 15 seconds the time for dispersing the powder coke was insufficient and the firing became non-uniform, and although the sintering rate was higher than in the case of the content, the sintering production rate decreased.
- a value obtained by subtracting the production rate of 0 mass% of the ultrafine powder raw material in the same exterior time from the production rate when the ultrafine powder raw material of 1 to 10 mass% was added was evaluated as a comparative production rate. As a result, it was found that the production rate was improved when the exterior time was 30 seconds or more.
- the upper limit of the ultrafine powder raw material is set to 10 mass% because if the ultrafine powder raw material is blended in an amount exceeding 10 mass%, local uneven distribution of the ultrafine powder raw material is recognized and the number of defective products tends to increase.
- the air permeability in the sintering test can be evaluated using the air permeability index: JPU shown in FIG. 7, and the higher the index, the higher the air permeability. From the results of this test, it was found that the air permeability was improved by adding the ultrafine powder raw material. Further, focusing on the sintering time, when the coke powder is put in from the start of granulation (interior), even if the ventilation is improved, the firing time is not shortened, but by covering the coke powder for 30 to 120 seconds, As the air permeability is improved, the sintering time becomes shorter. This is because the addition of the ultrafine powder raw material hinders the combustion of the powder coke, but the flammability is improved by coating the powder coke.
- ⁇ Test 2> (Regarding the exterior effect of limestone or return ore)
- the exterior effect of limestone or return ore when the superfine powder raw material was added to the exterior of the powder coke was evaluated.
- 99.9% or more of the ultrafine powder raw material has a particle diameter of 10 ⁇ m or less
- 4% of the raw materials other than the ultrafine powder raw material has a particle diameter of 10 ⁇ m or less.
- the sample of the example shown in Table 2 below (basicity, SiO 2 : 5% constant) was mixed with the sintering compounding raw material having the compounding composition shown in Table 2 and water (granulated product becomes 7.5%.
- Example 23 is the same as the data shown in Table 1-2.
- Example 41 sintering compound materials other than limestone and coke powder were granulated for 4.25 minutes, and then limestone was added. Next, the mixture was granulated for 0.25 minutes and powder coke was added. After that, granulation was performed for 1 minute.
- Example 42 a test was conducted in which the limestone of Example 42 was transferred by returning ore. Mixed with a drum mixer.
- the porosity of the powder coke and the granulation method were examined.
- the effect of suppressing the combustibility from being disturbed by the superfine powder entering the pores of the powder coke in the powder coke exterior is considered.
- the pore diameter that greatly contributes to combustion the balance between the ease of gas entry and the specific surface area of the pores is important. It is considered that this relationship does not depend on the substance.
- Japanese Unexamined Patent Publication No. 10-265857 discloses that the relationship between the sinter and the reducing gas is arranged to be 10 to 100 ⁇ m, and it was considered that the pore size is effective for the combustion of powder coke.
- the amount of the pore diameter of the powder coke is 10 to 100 ⁇ m or more, it is important to utilize the combustion through the pores when the amount is a certain value or more.
- the effect is exhibited when the particle diameter of the pore diameter is 10 to 100 ⁇ m is 0.40 cc/g, and it is presumed that the effect of the powder coke exterior effect becomes greater when the pore amount is more than this value.
- the present technology it is easier to obtain the effect than in the case of granulation using only the drum mixer.
- a drum mixer is subjected to a drop impact in the granulator, which has a great effect of destroying the granulated particles, making granulation difficult to proceed. Therefore, it is considered that the ultrafine powder adhering to the granulated particles is more likely to be peeled off as compared with the case where strong granulation is performed by a pelletizer or the like. Therefore, it is considered that the granulation using only the drum mixer is likely to obtain an effect that the coke and the ultrafine powder are not in contact for a short time.
- the fine powder which is difficult to be geometrically packed due to the particle size distribution of the raw material is more difficult to be incorporated into the granulated particles and contributes to filling the pores of the coke.
- the Andreasen (Gaudin-Schuhmann) distribution is known as an index of the particle size distribution (Suzuki et al., Chemical Engineering Proceedings, 11(1985) 4,438).
- D cumulative weight ratio
- Dp representative diameter
- Dp max maximum value of representative diameter
- the method for producing a sintered ore according to the present invention when granulating a sintering compounding raw material, even after improving the granulation property by adding an ultrafine powder material to the sintering compounding raw material, the sintering after sintering is performed. It is possible to prevent a decrease in the productivity of the ore, and this manufacturing method can be applied to various sintering compounding raw materials in addition to the exemplified ones.
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Abstract
Description
(1)前記粉コークスを添加してから造粒終了までの時間が、30~120秒であること、
(2)前記焼結配合原料の造粒に当たっては、粉コークスおよび石灰石または返鉱以外の焼結配合原料の造粒の開始よりも後で、前記粉コークスの添加よりも前に、前記石灰石または返鉱を添加すること、
(3)前記粉コークスとして、10~120μmの気孔量が0.40cc/g以上である粉コークスを使用すること、
(4)前記造粒は、ドラムミキサーのみを使用して行われること、
がより好ましい解決手段となるものと考えられる。
本発明では、超微粉粒子を過半量含む超微粉原料を焼結配合原料に添加した際、焼結配合原料の焼結での燃焼が阻害される原因は、焼結での熱源となる粉コークスへの超微粉粒子の被覆であると想到した。ここで、超微粉粒子とは、粒度が-10μm以下(ここでは粒径が10μm以下)の微粒子のことを示しており、成分などで規定されるものではない。これらの粒子は粒径が小さいため、比表面積が高くなり、粒子同士の接触点数を増加させる効果がある。そのため、超微粉粒子は付着性が高く、造粒時に添加することで造粒性を改善する効果がある。
(1)超微粉原料により造粒が促進された焼結配合原料の造粒後半に、粉コークスを添加することにより、超微粉原料を含む焼結配合原料を粉コークスで外装する。
(2)造粒の後半に、超微粉原料が含まれていない原料(石灰石または返鉱)を添加(外装)し、その後、粉コークスを外装添加する。
まず、本発明の焼結鉱の製造方法の概略は以下の通りである。すなわち、本発明の特徴は、粒径10μm以下が過半量である超微粉原料を配合して配合後の総量の内の粒径10μm以下を1~10mass%増加せしめた焼結配合原料の造粒時、造粒途中で粉コークスを添加し、粉コークスを外装する点にある。
本試験1では、超微粉原料を添加した際の粉コークスの外装効果を評価した。本例では、超微粉原料はその99.9%以上が粒径10μm以下であり、超微粉原料以外の原料はその4%が粒径10μm以下である。また、以下の表1-1および表1-2に示す比較例および実施例のサンプル(塩基度、SiO2:5%一定)を、表1-1および表1-2に示す配合組成を有する焼結配合原料と水(造粒物が7.5%となる水分)をドラムミキサーに入れ、合計5分造粒を行い、焼結用造粒原料を作製した。その後、焼結用造粒原料を、鍋試験機を用いて焼成した。
本試験2では、超微粉原料を添加し粉コークスの外装した際の、石灰石または返鉱の外装効果を評価した。本例では、超微粉原料はその99.9%以上が粒径10μm以下であり、超微粉原料以外の原料はその4%が粒径10μm以下である。また、以下の表2に示す実施例のサンプル(塩基度、SiO2:5%一定)を、表2に示す配合組成を有する焼結配合原料と水(造粒物が7.5%となる水分)をドラムミキサーに入れ、合計5分造粒を行い、焼結用造粒原料を作製した。その後、焼結用造粒原料を、鍋試験機を用いて焼成をした。なお、実施例23は、表1-2に示すデータと同じである。
WO2018/194014では、細粒の粉コークスを用いる際に造粒性が低下する対策として超微粉の添加が検討されている。その際、超微粉を分散するため高速撹拌機による事前処理を用いている。しかしながら、この発明では粉コークスの外装による造粒性改善効果を狙ったものであり、微粉添加時の粉コークスの燃焼性の改善を目的とした開発ではなかった。
WO2011/004907では、平均粒径が10μmである超微粉を加えてドラムミキサーで混合後、ペレタイザー造粒し、最後に粉コークスでコーティングする際に、造粒粒子強度に合わせて外装時間を調整するという発明がされている。この発明では、外装時間が長いと造粒粒子が崩壊し、造粒粒子表層で粉コークスと焼結原料が混在し、燃焼性を悪化または造粒性を悪化することが提案されている。
ここで燃焼に大きく寄与する気孔径として、ガスの入りやすさと気孔の比表面積のバランスが重要となる。この関係は物質に依らないと考えられる。特開平10-265857号公報では、焼結鉱と還元ガスの関係が10~100μmで整理されることが開示されており、粉コークスの燃焼にもその気孔径が有効であると考察した。粉コークスの気孔径10~100μmの量は、ある一定以上の場合は、その気孔を介した燃焼を活用することが重要となる。本発明では気孔径10~100μmの粒径が0.40cc/gで効果が発現しており、この気孔量以上で粉コークス外装効果の効果が大きくなることが推定される。
ディスクペレタイザーとドラムミキサーの能力の比較については過去鈴木らによって行われている(鈴木ら、鉄と鋼 15(1987)1932)。鈴木らは造粒に影響を及ぼす転動距離で各造粒機の能力を比較しており、同一転動距離でもペレタイザーの造粒能力(粒子径を大きくする能力)が高いことを明らかにしている。
本発明では、上記造粒能力は転動距離による造粒粒子を大きくする効果と造粒機内での擬似粒子を破壊する能力の組合せの能力であり、ドラムミキサーの能力がペレタイザーよりも低い原因はその破壊現象を反映しているものであると想到した。
D:積算重量割合、Dp:代表径、Dpmax:代表径の最大値、q:Fuller指数
この指数qが0.7に近いほど空隙は幾何学的に充填しやすいことが知られている。表1-1に示す比較例1で用いた原料の配合の場合、q=0.2になることがわかった。細粒を添加することでqは低下する。そのため超微粉を添加することで、充填しがたい超微粉が加わることとなる。粒子間に入らない超微粉は、超微粉のみで凝集するか他粒子の気孔に入り込む。そのため、粉コークスの気孔を埋めてしまう超微粉は存在しやすくなると考えられる。そのため、本発明のように通常配合よりも超微粉を増加させる際には粉コークス外装も効果が大きくなる。
Claims (5)
- 複数種類の銘柄からなる鉄鉱石を含む焼結配合原料を造粒機にて造粒し、得られた焼結用造粒原料を焼結機にて焼成することにより焼結鉱を得る焼結鉱の製造方法において、
前記焼結配合原料は、粒径10μm以下が過半量である超微粉原料を配合して配合後の総量の内の粒径10μm以下を1~10mass%増加せしめ、その焼結配合原料を造粒するに際しては、粉コークス以外の焼結配合原料を造粒機にて造粒する途中で粉コークスの添加を行うことを特徴とする焼結鉱の製造方法。 - 前記粉コークスを添加してから造粒終了までの時間が、30~120秒であることを特徴とする請求項1に記載の焼結鉱の製造方法。
- 前記焼結配合原料の造粒に当たっては、粉コークスおよび石灰石または返鉱以外の焼結配合原料の造粒の開始よりも後で、前記粉コークスの添加よりも前に、前記石灰石または返鉱を添加することを特徴とする請求項1または2に記載の焼結鉱の製造方法。
- 前記粉コークスとして、10~120μmの気孔量が0.40cc/g以上である粉コークスを使用することを特徴とする請求項1~3のいずれか1項に記載の焼結鉱の製造方法。
- 前記造粒は、ドラムミキサーのみを使用して行われることを特徴とする請求項1~4のいずれか1項に記載の焼結鉱の製造方法。
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WO2011004907A1 (ja) * | 2009-07-10 | 2011-01-13 | Jfeスチール株式会社 | 焼結用原料の製造方法 |
WO2018194014A1 (ja) * | 2017-04-17 | 2018-10-25 | Jfeスチール株式会社 | 焼結鉱の製造方法 |
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WO2011004907A1 (ja) * | 2009-07-10 | 2011-01-13 | Jfeスチール株式会社 | 焼結用原料の製造方法 |
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