WO2024057693A1 - 鉄鉱石ペレットの製造方法 - Google Patents

鉄鉱石ペレットの製造方法 Download PDF

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Publication number
WO2024057693A1
WO2024057693A1 PCT/JP2023/025629 JP2023025629W WO2024057693A1 WO 2024057693 A1 WO2024057693 A1 WO 2024057693A1 JP 2023025629 W JP2023025629 W JP 2023025629W WO 2024057693 A1 WO2024057693 A1 WO 2024057693A1
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WO
WIPO (PCT)
Prior art keywords
ore
iron ore
core
pellets
mass
Prior art date
Application number
PCT/JP2023/025629
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English (en)
French (fr)
Japanese (ja)
Inventor
健太 竹原
隆英 樋口
直人 中村
謙弥 堀田
頌平 藤原
友司 岩見
Original Assignee
Ｊｆｅスチール株式会社
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Publication date
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to AU2023341034A priority Critical patent/AU2023341034A1/en
Priority to CN202380065660.5A priority patent/CN119855926A/zh
Priority to JP2024504887A priority patent/JPWO2024057693A1/ja
Priority to EP23865055.0A priority patent/EP4575021A4/en
Publication of WO2024057693A1 publication Critical patent/WO2024057693A1/ja

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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
    • 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
    • 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
    • C22B1/2413—Binding; Briquetting ; Granulating enduration of pellets
    • 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 method for producing iron ore pellets.
  • Iron ore pellets are iron ore powder that has been granulated to have properties (e.g. size, strength, reducibility, etc.) suitable for feeding into a blast furnace or solid reduction furnace.
  • iron ore pellets are generally produced by a process of pulverizing iron ore raw material to obtain fine ore, and mixing the fine ore, a binder, and optional auxiliary raw materials to form a mixture. granulating the mixture to obtain green pellets; and firing the green pellets to obtain iron ore pellets.
  • green pellets the pellets as granulated and before firing are referred to as "green pellets.”
  • the present invention aims to provide a method for producing iron ore pellets that yields green pellets that have high strength and can suppress bursting.
  • the present inventors conducted extensive studies and found that in addition to iron ore with a particle size of 1 mm or less obtained by pulverizing iron ore raw materials, iron ore with a particle size of 1 mm or less obtained without pulverizing iron ore raw materials It has been found that by mixing and granulating iron ore with a certain particle size to produce green pellets, the falling strength of the green pellets can be ensured and bursting can be suppressed.
  • the gist of the present invention which was completed based on the above findings, is as follows.
  • the particle size and mass ratio of the core ore are set so that the number of core ores contained in each iron ore pellet is 0.9 to 1.0 on average, [1] to [6] ] The method for producing iron ore pellets according to any one of the above.
  • the mass of the fine ore is W1
  • the mass of the binder is W2
  • W2/W1 ⁇ 100 is 1.0 or more.
  • the iron ore pellet manufacturing method of the present invention makes it possible to obtain green pellets that are high in strength and suppress bursting.
  • FIG. 1 is a diagram schematically showing a cross section of an iron ore pellet obtained according to an embodiment of the present invention.
  • FIG. 2 is a diagram schematically showing a growth process in a green pellet granulation process in an embodiment of the present invention and a comparative example.
  • FIG. 2 is a diagram schematically showing the outline of an electric furnace used for bursting temperature measurement.
  • a method for producing iron ore pellets according to an embodiment of the present invention includes a step of mixing iron ore with a total Fe content of 63% by mass or less and a binder to obtain a mixture, and granulating the mixture to obtain green pellets. and a step of firing the green pellets to obtain iron ore pellets.
  • the iron ore for obtaining the mixture is characterized by having a core ore having a particle size of more than 1 mm and a fine ore having a particle size of 1 mm or less.
  • iron ore particles having a particle size of more than 1 mm, which are obtained without pulverizing the iron ore raw material are referred to as "core ore", and iron ore particles having a particle size of 1 mm or less, which are obtained by pulverizing the iron ore raw material.
  • the stone particles are called "fine ore”.
  • core ore is used in addition to fine ore as the iron ore that constitutes the green pellets. Since the green pellets contain high-strength core ore, the strength of the green pellets can be ensured. In addition, compared to the conventional technology in which the iron ore constituting the green pellets is only fine ore, in this embodiment, the green pellets include core ore with a large particle size, so it is possible to reduce the speed of drying and decrystallization water. can. By containing the core ore, the porosity of the green pellets is lowered, and the green pellets are dense, making it difficult to retain water. In addition, since there are few gas paths, it is difficult for steam to be generated from inside the green pellets. As a result, bursting can be sufficiently suppressed.
  • the "particle size" of iron ore corresponds to the nominal opening of a sieve screen in accordance with JIS Z 8801:2019. That is, iron ore having a particle size exceeding X mm is iron ore that remains on the sieve when it is sieved through a sieve with a nominal opening of X mm. Iron ore having a particle size of Ymm or less is iron ore that passes through the sieve and becomes the bottom of the sieve when it is sieved through a sieve with a nominal opening of Ymm.
  • the type and characteristics of the core ore are not particularly limited as long as it is iron ore with a particle size exceeding 1 mm and a total Fe content of 63% by mass or less. Moreover, it is preferable that the particle size of the core ore is 9.5 mm or less. When the particle size is 9.5 mm or less, the size of the completed iron ore pellets is suitable, and the subsequent reduction treatment etc. can be performed uniformly.
  • the mass ratio of the core ore is preferably 15% by mass or more based on the total iron ore. This means that the more core ore that has a larger volume than normal crushed iron ore powder, the more effective the binder such as bentonite can be even with a small amount, and the better the strength improvement and bursting suppressing effect can be obtained. It is from.
  • the mass ratio of particles having a particle size of more than 2.8 mm in the core ore is 15% by mass or more based on the total iron ore. , more preferably 30% by mass or more.
  • the mass ratio of the core ore having a particle size of more than 1 mm and less than or equal to 2.8 mm is not particularly limited and may be 0 mass %.
  • the mass ratio of particles having a particle size of more than 4.8 mm in the core ore is 10% by mass or more with respect to the total iron ore, More preferably, the content is 25% by mass or more.
  • the mass ratio of the core ore having a particle size of more than 1 mm and less than 4.8 mm is not particularly limited and may be 0 mass %.
  • the mass ratio of the core ore is preferably 99% by mass or less, more preferably 75% by mass or less based on the total iron ore.
  • the mass ratio of particles having a particle size of more than 1 mm is at most about 75% by mass.
  • Powdered ore is obtained by crushing iron ore using a general ball mill or the like.
  • the average particle size of the fine ore is preferably about several tens of micrometers.
  • the Blaine index of the fine ore is preferably about 2000 to 4000 cm 2 /g, more preferably about 2500 to 3500 cm 2 /g. When the Blaine index is 2000 cm 2 /g or more, the efficiency of powder production is more suitable. When the Blaine index is 4000 cm 2 /g or less, shrinkage due to sintering during firing is suppressed, and the strength is more suitable.
  • the Blaine index is measured using a Blaine air permeation device specified in JIS R 5201:2015, and represents the specific surface area of the powder. In the pellet manufacturing process, the Blaine index is used as a control index for ore particle size, and the higher the value, the more fine the ore is.
  • the iron ore raw material is sieved through a sieve with 1 mm openings, the top of the sieve is used as core ore, and the bottom of the sieve is crushed and used as fine ore. is preferable.
  • each may be prepared separately from iron ore raw materials.
  • each of the iron ore pellets obtained in this embodiment preferably contains one core ore 10, with fine ore 12 attached to the surface of the core ore 10. It is preferable that the same applies to the green pellet stage. When the green pellets and iron ore pellets contain one core ore, strength can be suitably obtained.
  • FIG. 2 shows a schematic diagram (cross-sectional view) of the growth process in the granulation process of green pellets.
  • layering granulation occurs in which fine ore 12, binder, etc. adhere to the surface of core ore 10 in a layered manner. It will be done.
  • the green pellets do not contain core ore, it is thought that a core 14 of powder aggregates is formed by fine ore instead of core ore, and the core 14 of the powder aggregate is covered with fine ore and granulation progresses, but the binder is inside the green pellet.
  • the strength decreases because the particles are dispersed into
  • the green pellet contains more than one core ore, it is necessary to wrap the fine ore layer around multiple core ores at once during the growth process, and the particles grow rapidly, resulting in a dense covering layer. The strength will be lower than when there is only one core ore.
  • the particle size and mass ratio of the core ore so that the number of core ores contained in one iron ore pellet is on average 0.9 to 1.0.
  • the weight ratio G of the core ore can be determined from the sizes of the core ore and green pellets as follows.
  • the weight ratio G of the core ore in the green pellet is considered to be equal to the effective volume ratio of the core ore in the green pellet (the volume ratio excluding the pores in the aggregate of fine ore).
  • “(1-T)*(1-K)” is the volume ratio of the fine ore aggregate in the green pellet excluding the pore portion.
  • bentonite is preferred, but any known or arbitrary binder, such as organic or inorganic binders that provide similar effects, may be used.
  • limestone, dolomite, or the like may be mixed as an auxiliary raw material.
  • auxiliary raw materials various reducing agents, additives, etc. may be added depending on the type of furnace used for the reduction treatment after firing. Specifically, a carbon material such as coal or coke may be used as the reducing agent.
  • the amount of binder in the mixture is as follows: W1 is the mass of fine ore, W2 is the mass of binder, W2/W1 ⁇ 100 ⁇ 1.0 It is preferable that the amount satisfies the following. Within the above range, the amount of binder is suitable for the fine ore, the effect of the binder can be suitably obtained, and the strength can be ensured. The above range is more preferably 1.4 or more, and even more preferably 1.6 or more. The larger the amount of binder, the easier it is to ensure pellet strength, but since the purity of reduced iron decreases, it is preferably in the range of 3.0 or less.
  • Iron ore pellets are manufactured by common crushing, mixing, granulation, and calcination processes.
  • the pulverization process may be performed using a pulverizer such as a general ball mill, and is performed only on iron ore used as fine ore.
  • a common concrete mixer or the like may be used in the mixing step.
  • a general pelletizer, drum mixer, etc. may be used for the granulation process.
  • a general shaft furnace, rotary kiln, or the like may be used.
  • the granulated green pellets preferably have a size of about 9.5 to 12 mm. If the size of the green pellets is less than 9.5 mm, air permeability will deteriorate when the green pellets are filled into a blast furnace as fired pellets. If the size of the green pellet exceeds 12 mm, the reducibility will decrease.
  • the iron ore After drying the iron ore at 105°C for 24 hours, it was sieved using a sieve with openings of 1.0 mm, 2.8 mm, 4.8 mm, 6.7 mm, 8.0 mm, and 9.5 mm using a low tap. The iron ore on these sieves was used as core ore. Table 1 shows the components of the iron ore used as a raw material. In addition, T. Fe is the total amount of iron in the iron ore, and LOI (Loss on Ignition) is the loss on ignition during measurement. Iron ore having the same composition as above was similarly dried at 105° C. for 24 hours and then ground in a ball mill to obtain iron ore powder. The entire amount of fine ore passes through a sieve with an opening of 1.0 mm, that is, it has a particle size of 1 mm or less. The Blaine index of the fine ore was 2560 cm 2 /g.
  • core ore and fine ore were prepared so that the total amount was 5000 g, and mixed with bentonite at a predetermined ratio for 3 minutes at 20 rpm using a concrete mixer.
  • the amount of bentonite added (mass %) to the entire iron ore (total of core ore and fine ore) is shown in the "bentonite ratio" column of Table 2.
  • the mixed raw materials were placed in a 1.2 m ⁇ pelletizer and granulated while adding water. Pellet particles of 9.5 to 12 mm were collected and rolled in a pelletizer for an additional 10 minutes to obtain green pellets.
  • the blending amounts of the core ore and fine ore were adjusted so that the number of core ores contained in one green pellet was 1.0 on average.
  • Table 2 shows the volume ratio of core ore to green pellets and the number of core ores per green pellet. Note that the porosity was 33%.
  • FIG. 3 schematically shows the outline of the electric furnace used in this example.
  • a green pellet filling basket 32 filled with 200 g of green pellets is placed in an electric furnace 30, and hot air (air) at 200°C (measured with a thermocouple 34) is flowed from a heating gas source 36 at a flow rate of 1.2 m/sec. , and held for 10 minutes. After holding, the sample was taken out and checked for rupture. If no rupture was confirmed, the temperature of the hot air was increased in increments of 40°C, a new sample was placed in the furnace, and the same test was repeated. The temperature at which bursting of the sample was confirmed was defined as the bursting temperature, and the results are shown in Table 2.

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PCT/JP2023/025629 2022-09-16 2023-07-11 鉄鉱石ペレットの製造方法 WO2024057693A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU2023341034A AU2023341034A1 (en) 2022-09-16 2023-07-11 Method of producing iron ore pellets
CN202380065660.5A CN119855926A (zh) 2022-09-16 2023-07-11 铁矿石球团的制造方法
JP2024504887A JPWO2024057693A1 (enrdf_load_stackoverflow) 2022-09-16 2023-07-11
EP23865055.0A EP4575021A4 (en) 2022-09-16 2023-07-11 PROCESS FOR PRODUCING IRON ORE PELLETS

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JP2022-148507 2022-09-16
JP2022148507 2022-09-16

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EP (1) EP4575021A4 (enrdf_load_stackoverflow)
JP (1) JPWO2024057693A1 (enrdf_load_stackoverflow)
CN (1) CN119855926A (enrdf_load_stackoverflow)
AU (1) AU2023341034A1 (enrdf_load_stackoverflow)
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5527607B2 (enrdf_load_stackoverflow) * 1978-03-03 1980-07-22
JPS57200529A (en) * 1981-06-02 1982-12-08 Nippon Steel Corp Preparation of sintered ore having iron ore fine powder highly compounded therein
JPS63149336A (ja) * 1986-12-15 1988-06-22 Nkk Corp 焼成塊成鉱の製造方法
JP2003293043A (ja) * 2002-04-04 2003-10-15 Jfe Steel Kk 高炉用焼結鉱の製造方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1541700B1 (en) * 2002-08-21 2012-02-29 Nippon Steel Corporation Method of granulating sintering material for iron manufacturing
JP4518895B2 (ja) * 2004-09-29 2010-08-04 新日本製鐵株式会社 焼結用原料の評価方法および配合設計方法
JP5000366B2 (ja) * 2007-04-12 2012-08-15 新日本製鐵株式会社 焼結鉱の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5527607B2 (enrdf_load_stackoverflow) * 1978-03-03 1980-07-22
JPS57200529A (en) * 1981-06-02 1982-12-08 Nippon Steel Corp Preparation of sintered ore having iron ore fine powder highly compounded therein
JPS63149336A (ja) * 1986-12-15 1988-06-22 Nkk Corp 焼成塊成鉱の製造方法
JP2003293043A (ja) * 2002-04-04 2003-10-15 Jfe Steel Kk 高炉用焼結鉱の製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4575021A4 *

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CN119855926A (zh) 2025-04-18
AU2023341034A1 (en) 2025-02-13
JPWO2024057693A1 (enrdf_load_stackoverflow) 2024-03-21
EP4575021A1 (en) 2025-06-25
EP4575021A4 (en) 2025-07-02

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