WO2024047950A1 - 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
WO2024047950A1
WO2024047950A1 PCT/JP2023/017633 JP2023017633W WO2024047950A1 WO 2024047950 A1 WO2024047950 A1 WO 2024047950A1 JP 2023017633 W JP2023017633 W JP 2023017633W WO 2024047950 A1 WO2024047950 A1 WO 2024047950A1
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WO
WIPO (PCT)
Prior art keywords
ore
less
iron ore
pellets
mass
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Ceased
Application number
PCT/JP2023/017633
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English (en)
French (fr)
Japanese (ja)
Inventor
直人 中村
隆英 樋口
友司 岩見
健太 竹原
頌平 藤原
謙弥 堀田
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JFE Steel Corp
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JFE Steel Corp
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Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2023552600A priority Critical patent/JP7626241B2/ja
Priority to CN202380061039.1A priority patent/CN119768541A/zh
Priority to EP23859721.5A priority patent/EP4560033A4/en
Priority to US19/105,337 priority patent/US20260049372A1/en
Priority to CA3262913A priority patent/CA3262913A1/en
Priority to AU2023333668A priority patent/AU2023333668A1/en
Publication of WO2024047950A1 publication Critical patent/WO2024047950A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • the present invention relates to a method for producing iron ore pellets.
  • JP-A-04-099132 discloses a method for producing iron ore pellets containing a large amount of crystallization water.
  • raw iron ore containing a large amount of crystallization water is crushed and granulated, and then, after each step of drying, syneresis, and preheating, a firing step is added to produce fired pellets.
  • a firing step is added to produce fired pellets.
  • At least a part of the crystal water in the raw material iron ore is treated with syneresis in advance. This manufacturing method is said to reduce bursting and increase the crushing strength of the preheated pellets, thereby improving product yield.
  • the present disclosure has been made in view of the above circumstances, and its purpose is to provide a method for producing iron ore pellets that achieves both the suppression of bursting and the strength of iron ore pellets.
  • the method for producing iron ore pellets according to the present disclosure to achieve the above object is as follows.
  • [1] Includes a decrystallization water treatment step to obtain dehydrated ore by removing crystallization water from iron ore with an iron content of 63% by mass or less,
  • the iron ore pellets are heated to a temperature of 100° C. or more and 800° C. or less and held for 5 minutes or more and 200 minutes or less.
  • the method for producing iron ore pellets according to the present disclosure may be further as follows.
  • the method for producing iron ore pellets of the present disclosure it is possible to provide a method for producing iron ore pellets that achieves both the suppression of bursting and the strength of iron ore pellets.
  • the iron ore pellets according to this embodiment are so-called green pellets (pre-fired pellets).
  • the method for producing iron ore pellets according to the present embodiment includes a decrystallization water treatment step in which crystallization water is removed from iron ore having an iron content of 63% by mass or less (so-called low-grade ore) to obtain dehydrated ore. .
  • iron ore with an iron content of 63% by mass or less is simply referred to as iron ore.
  • the iron ore is heated to a temperature of 100°C or more and 800°C or less and held for 5 minutes or more and 200 minutes or less.
  • the method for producing iron ore pellets may further include a pulverizing step of pulverizing the dehydrated ore to obtain ore powder.
  • the ore powder is preferably pulverized so that the proportion of particles with a particle size of 10 ⁇ m or less is 10% by mass or more and 70% by mass or less.
  • bursting is a phenomenon in which when iron ore pellets (green pellets) are heated, the water in the green pellets evaporates, causing the green pellets to explode or become powder.
  • the method for producing iron ore pellets according to the present embodiment includes, in addition to the above-mentioned decrystallization water treatment step and crushing step, a granulation step of granulating ore powder to obtain iron ore pellets (green pellets). may be included.
  • the green pellets may then be fired in a firing step to form fired pellets.
  • the iron ore pellets according to the present embodiment (the pellets before firing) may be referred to as green pellets, and the pellets after firing may be referred to as fired pellets.
  • Green pellets and calcined pellets may contain raw materials other than iron ore (eg, bentonite).
  • the type and composition (ore composition) of iron ore that is the raw material for green pellets are not particularly limited.
  • the raw material for green pellets may be made of a single iron ore, or may be a mixture of a plurality of ores in any combination.
  • the content of crystallization water in iron ore (before the decrystallization water process), which is the raw material for green pellets, is not particularly limited.
  • the content of crystal water can be measured as the amount of weight loss (LOI: Loss On Ignition) of iron ore when the iron ore is held at 1000° C. for 30 minutes.
  • LOI Loss On Ignition
  • the decrystallization water treatment step is a step of performing decrystallization water treatment to remove crystallization water from iron ore to obtain dehydrated ore.
  • iron ore is heated to remove crystallization water from the iron ore.
  • the iron ore is heated and held at a decrystallization water treatment temperature of 100° C. or more and 800° C. or less as the above-mentioned decrystallization water treatment.
  • the holding time for holding the iron ore at a temperature within the above temperature range (hereinafter referred to as decrystallization water time) is 5 minutes or more and 200 minutes or less.
  • the decrystallization water time is set to 5 minutes or more and 200 minutes or less.
  • the decrystallization water time is preferably 180 minutes or less. When the decrystallization water time is 180 minutes or less, a decrease in the strength of the green pellets can be appropriately avoided.
  • the decrystallization water treatment temperature and decrystallization water time are important factors for removing crystallization water.
  • the decrystallization water treatment temperature is less than 100°C, crystallization water cannot be sufficiently removed from the iron ore.
  • the decrystallization water treatment temperature is higher than 800° C., the crushability of the iron ore deteriorates and the strength of the green pellets becomes insufficient. Therefore, the decrystallization water treatment temperature is set at 100°C or higher and 800°C or lower. If the decrystallization water treatment temperature is within this range and the decrystallization water time is 5 minutes or more and 200 minutes or less as described above, it is possible to both suppress bursting and increase the strength of the green pellets.
  • the decrystallization water treatment temperature is preferably 200°C or higher and 500°C or lower.
  • the strength of the green pellets can be made sufficiently high. Furthermore, bursting can be better suppressed.
  • the content of crystal water in the dehydrated ore is also not particularly limited.
  • the content of water of crystallization in the dehydrated ore can also be measured as the LOI in the same way as the content of water of crystallization in the iron ore before the decrystallization water step.
  • the content of crystallization water in the dehydrated ore is preferably reduced by 10% by mass or more from the content of crystallization water in the iron ore before the decrystallization water step.
  • the crushing process is a process of crushing dehydrated ore to obtain ore powder.
  • the method of crushing the dehydrated ore in the crushing process and the crushing time required for crushing are not particularly limited.
  • the crushing time is preferably 15 minutes or more and 75 minutes or less.
  • the shape of the ore powder is not particularly limited. It is preferable that the particle size of the ore powder is, for example, 95% by mass or more of particles of 300 ⁇ m or less.
  • the particle size distribution of the ore powder is preferably such that the proportion of particles with a particle diameter of 10 ⁇ m or less is 10% by mass or more and 70% by mass or less.
  • the particle size or particle size distribution of ore powder is an important factor that affects the strength of green pellets. Note that ore powder can be obtained by crushing iron ore. The method of crushing iron ore is not particularly limited.
  • the proportion of fine powder with a particle size of 10 ⁇ m or less has a particularly large effect on the strength of green pellets.
  • the proportion of fine powder with a particle size of 10 ⁇ m or less is less than 10% by mass, green pellets with sufficient strength may not be obtained.
  • the proportion of fine powder with a particle size of 10 ⁇ m or less is preferably 20% by mass or more and 60% by mass or less. Thereby, bursting can be suppressed while obtaining appropriate green pellet strength.
  • the granulation process is a process of granulating ore powder to obtain iron ore pellets (green pellets).
  • the granulation method in the granulation step is not limited.
  • the ore powder may be granulated using a pelletizer.
  • a pelletizer for example, a pan-type granulator (so-called pan pelletizer) may be used.
  • the shape and size (for example, particle size and average particle size) of the iron ore pellets are not particularly limited, and may be set to any value.
  • the size of the green pellet may be determined by, for example, measuring the major axis diameter and the minor axis diameter using a caliper, and evaluating the average value as the particle size of the green pellet.
  • the particle size of the green pellets is preferably 16 mm from 9 mm, which is commonly used in this technical field.
  • the green pellets are then subjected to a firing process and fired to produce fired pellets.
  • the firing temperature in the firing step is, for example, 1200°C to 1350°C.
  • the strength generally required in this technical field (for example, 1.0 kg/pellet or more) ).
  • the strength of the green pellets is preferably 1.0 kg/pellet or more.
  • the particle size distribution of the ore powder used as a raw material is a predetermined distribution, that is, the proportion of particles having a diameter of 10 ⁇ m or less is 10% by mass or more and 70% by mass or less. In this case, the strength of green pellets tends to be higher. Note that the strength of the green pellets can be measured by the method described in Examples described later.
  • bursting can be suppressed if the decrystallization water treatment temperature and decrystallization water time are within the above ranges.
  • bursting can be better suppressed when the particle size distribution of the ore powder used as a raw material is the above-mentioned predetermined distribution.
  • bursting is a phenomenon in which when the green pellets are heated, the moisture in the green pellets evaporates, causing the green pellets to explode or turn into powder.
  • the likelihood of bursting is evaluated based on the percentage of pellets of 5 mm or less that are formed after heat-treating the green pellets at a predetermined temperature (e.g., 300°C) or after firing the green pellets. can do.
  • a predetermined temperature e.g. 300°C
  • the amount of pellet pieces generated in the firing process etc. is 3.0% by mass or less, preferably 1.5% by mass or less, and more preferably 1.0% by mass or less, a decrease in the yield of fired pellets can be suppressed. can. Therefore, if the amount of pellet pieces generated during the firing process or the like is 1.0% by mass or less, it can be evaluated that the green pellets are of good quality with suppressed bursting.
  • Green pellets were produced according to the following procedure and their bursting properties were evaluated.
  • iron ore serving as a raw material for green pellets
  • ores (Ore A, Ore B) having the chemical composition shown in Table 1 were used.
  • "LOI” in Table 1 is shown as the content of crystallization water (mass %) as described above.
  • T.Fe represents the mass % of the iron content (total Fe content) in the iron ore. Note that “T.Fe” is a value determined based on the total iron determination method of iron ore specified in JIS M 8212:2022.
  • Ore A and Ore B used as raw materials for green pellets are both T. It is iron ore (so-called low-grade ore) containing 63% by mass or less of Fe.
  • Table 2 shows information on the ore used for the green pellets (ore properties), and the conditions or evaluation results of the decrystallization water treatment process, crushing process, granulation process, and firing process.
  • the ore composition shown in Table 2 was used, and the experiment No. 1 to 16 green pellets were obtained.
  • Each raw material ore blended in the ore proportion shown in Table 2 was subjected to decrystallization water treatment at the decrystallization water treatment temperature and decrystallization water time shown in Table 2 to obtain dehydrated ore (dehydration step).
  • the decrystallization water treatment was performed in the atmosphere.
  • the LOI of the dehydrated ore is shown in Table 2 as the crystallization water content of the dehydrated ore.
  • the dehydrated ore was crushed in a ball mill for the crushing time shown in Table 2 (batch processing) to obtain ore powder (pulverization step). Then, the proportion of fine powder with a particle size of 10 ⁇ m or less in the ore powder was measured as the proportion (mass %) passing through a sieve with an opening of 10 ⁇ m. Table 2 shows the proportion of fine powder with a particle size of 10 ⁇ m or less in the ore powder as the "-10 ⁇ m proportion" in the pulverization process.
  • Table 3 shows the volume-based cumulative 10% diameter (D10), cumulative 50% diameter (D50: median diameter), and cumulative 90% diameter (D90) as the particle size distribution of ore powder. These cumulative 10% diameter, cumulative 50% diameter, and cumulative 90% diameter were derived based on the volume-based particle size distribution in ore powder, which was measured using laser diffraction particle size measurement (Mastersizer 3000, manufactured by Malvern). Note that the dispersion medium used in measuring the particle size distribution was water. In Table 3, for convenience of viewing, the same "-10 ⁇ m ratio" as shown in Table 2 is listed again.
  • a mixed powder 1.0% by mass of bentonite was added to the ore powder to obtain a mixed powder.
  • bentonite was added as a binder during granulation, it is not essential in this embodiment.
  • This mixed powder was granulated using a pan-type granulator (pelletizer) to obtain green pellets (granulation step).
  • the mixed powder was rolled while adding water so that the granulation water content (amount of water added) was 10% by mass to 10.5% by mass of the weight of the green pellets.
  • the granulation moisture content can be determined by measuring the weight change before and after holding the green pellets at 105° C. for 24 hours. For example, if the weight change rate after holding the green pellets at 105° C. for 24 hours is -10% by weight, the granulation moisture is 10%.
  • the major axis diameter and minor axis diameter were measured using a caliper, and the average value (arithmetic mean) was used.
  • each experiment No. For each green pellet, the particle size of 10 pellets was measured, and the average value (arithmetic mean) was calculated for that experiment No. was adopted as the particle size of green pellets.
  • the strength of the green pellets was measured using an autograph.
  • the strength of the green pellet was measured by deforming the green pellet at a displacement rate of 1 mm/min and obtaining a load-displacement curve.
  • the load corresponding to the first displacement peak position in the load-displacement curve was adopted.
  • Each experiment no. For each green pellet, the intensity of 10 pellets was measured, and the average value (arithmetic mean) was calculated for that experiment No. This was adopted as the strength of green pellets.
  • Bursting property was evaluated by the amount of pellet pieces generated after the firing process. Specifically, the bursting property was evaluated as follows. First, 500 g of green pellets were charged into a vertical furnace (cylindrical shape with a diameter of 60 mm), and air at 300°C was blown upward from below the layer of green pellets at a wind speed of 1.0 m/sec (however, 300 °C/1 atm) for 10 minutes. Next, the green pellets exposed to air at 300°C were heated to 1250°C in an electric furnace different from the above-mentioned furnace, and fired at this temperature for 25 minutes (firing step).
  • the green pellets were taken out from the furnace and sieved through a sieve with an opening of 5 mm, and the proportion (mass %) of the pellet pieces that passed through the sieve was measured to evaluate the bursting property.
  • the passing rate of pellet pieces is shown as "-5 mm rate.”
  • experiment no. 1 to 5, 10 to 14, 17 and 18, and experiment no When comparing green pellets Nos. 8 and 9, it can be seen that the strength of the green pellets tends to be high when D90 is 50 ⁇ m or more and 200 ⁇ m or less.
  • Green pellets No. 15 and 16 have a green pellet strength of less than 1.0 kg/pellet or a pellet piece passing rate (-5 mm rate) of more than 1.0 mass%. That is, experiment no. Green pellets Nos. 6, 7, 15, and 16 do not have both green pellet strength and bursting properties.
  • Figure 1 shows experiment no. The relationship between the strength of green pellets Nos. 1 to 5, 8 to 14, 17 and 18 and the ratio of particle diameters of 10 ⁇ m or less in ore powder (-10 ⁇ m ratio) is shown. Moreover, in FIG. 2, experiment No. It shows the relationship between the passing ratio of pellet pieces of green pellets 1 to 5, 8 to 14, 17 and 18 (-5 mm ratio) and the ratio of particle diameters of 10 ⁇ m or less in ore powder (-10 ⁇ m ratio).
  • the strength of the green pellets is 1.0 kg/pellet or more.
  • the strength of the green pellets becomes higher when the proportion of particles having a particle size of 10 ⁇ m or less in the ore powder is 25% by mass or more and 60% by mass or less.
  • the strength of the green pellet generally becomes convex upward as the proportion of particles with a particle size of 10 ⁇ m or less in the ore powder moves from a small side to a large side.
  • the present disclosure can be applied to a method for producing iron ore pellets.

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PCT/JP2023/017633 2022-09-01 2023-05-10 鉄鉱石ペレットの製造方法 Ceased WO2024047950A1 (ja)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2023552600A JP7626241B2 (ja) 2022-09-01 2023-05-10 鉄鉱石ペレットの製造方法
CN202380061039.1A CN119768541A (zh) 2022-09-01 2023-05-10 铁矿石球团的制造方法
EP23859721.5A EP4560033A4 (en) 2022-09-01 2023-05-10 PROCESS FOR PRODUCING IRON ORE PELLETS
US19/105,337 US20260049372A1 (en) 2022-09-01 2023-05-10 Method of producing iron ore pellets
CA3262913A CA3262913A1 (en) 2022-09-01 2023-05-10 Method of producing iron ore pellets
AU2023333668A AU2023333668A1 (en) 2022-09-01 2023-05-10 Method of producing iron ore pellets

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JP2022-139568 2022-09-01
JP2022139568 2022-09-01

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EP (1) EP4560033A4 (https=)
JP (1) JP7626241B2 (https=)
CN (1) CN119768541A (https=)
AU (1) AU2023333668A1 (https=)
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WO (1) WO2024047950A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0499132A (ja) 1990-08-07 1992-03-31 Kobe Steel Ltd 結晶水を多く含む鉄鉱石のペレット製造方法
JP2010163656A (ja) * 2009-01-15 2010-07-29 Kobe Steel Ltd 鉄鉱石ペレットの製造方法
JP2017031444A (ja) * 2015-07-29 2017-02-09 株式会社神戸製鋼所 焼結ペレットの製造装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6237325A (ja) * 1985-06-27 1987-02-18 Nippon Kokan Kk <Nkk> 焼成塊成鉱およびその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0499132A (ja) 1990-08-07 1992-03-31 Kobe Steel Ltd 結晶水を多く含む鉄鉱石のペレット製造方法
JP2010163656A (ja) * 2009-01-15 2010-07-29 Kobe Steel Ltd 鉄鉱石ペレットの製造方法
JP2017031444A (ja) * 2015-07-29 2017-02-09 株式会社神戸製鋼所 焼結ペレットの製造装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4560033A4

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EP4560033A1 (en) 2025-05-28
AU2023333668A1 (en) 2025-02-13
JPWO2024047950A1 (https=) 2024-03-07
CN119768541A (zh) 2025-04-04
JP7626241B2 (ja) 2025-02-04
EP4560033A4 (en) 2026-04-01
CA3262913A1 (en) 2025-06-09
US20260049372A1 (en) 2026-02-19

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