WO2018180233A1 - 造粒焼結原料の製造方法および焼結鉱の製造方法 - Google Patents

造粒焼結原料の製造方法および焼結鉱の製造方法 Download PDF

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Publication number
WO2018180233A1
WO2018180233A1 PCT/JP2018/008261 JP2018008261W WO2018180233A1 WO 2018180233 A1 WO2018180233 A1 WO 2018180233A1 JP 2018008261 W JP2018008261 W JP 2018008261W WO 2018180233 A1 WO2018180233 A1 WO 2018180233A1
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WO
WIPO (PCT)
Prior art keywords
sintered
raw material
granulated
iron ore
ore
Prior art date
Application number
PCT/JP2018/008261
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English (en)
French (fr)
Japanese (ja)
Inventor
健太 竹原
山本　哲也
寿幸 廣澤
友司 岩見
一洋 岩瀬
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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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 KR1020217039814A priority Critical patent/KR102391484B1/ko
Priority to CN201880022859.9A priority patent/CN110462070B/zh
Priority to KR1020197026468A priority patent/KR20190117612A/ko
Priority to BR112019019433-9A priority patent/BR112019019433B1/pt
Publication of WO2018180233A1 publication Critical patent/WO2018180233A1/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
    • 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
    • C22B1/16—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
    • C22B1/16—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

Definitions

  • the present invention relates to a method for producing a granulated sintered raw material and a method for producing a sintered ore using the same.
  • Sintered ore used in the blast furnace is composed of several brands of fine iron ore (for example, “sinter feed” having a size of less than 10 mm ( ⁇ 10 mm)), auxiliaries such as limestone, silica, and serpentine, dust, Moisture is added to the sintering raw material containing appropriate amounts of miscellaneous raw material powder such as scale and reclaimed minerals and solid fuel such as coke breeze, and then mixed and granulated.
  • miscellaneous raw material powder such as scale and reclaimed minerals and solid fuel such as coke breeze
  • miscellaneous raw material powder such as scale and reclaimed minerals and solid fuel such as coke breeze
  • miscellaneous raw material powder such as scale and reclaimed minerals and solid fuel such as coke breeze
  • miscellaneous raw material powder such as scale and reclaimed minerals and solid fuel such as coke breeze
  • miscellaneous raw material powder such as scale and reclaimed minerals and solid fuel such as coke breeze
  • the granulated sintered raw material that has been pseudo-particled is considered to have better ventilation as the granulated shape, particularly the larger shape, and various methods for improving the granulation property have been studied.
  • Patent Documents 1-5 relating to a method for adjusting the amount of fine powder to be attached to coarse particles as core particles (sintering raw material pretreatment method) There are suggestions like this.
  • Patent Documents 6 and 7 there is also a proposal of a technique in which ore containing high crystal water is pulverized and then mixed with other raw materials and granulated to form a granulated sintered raw material.
  • Patent Document 8 proposes a technique that performs granulation after pulverizing high porosity iron ore and mixing it with other raw materials.
  • high porosity iron ore It is known that Fe is low and water of crystallization is high, and even if pulverized, it adversely affects the operation of the sintering machine in terms of components.
  • the present invention overcomes the above-mentioned problems of the prior art, particularly even when a relatively large amount of fine iron ore having a size of ⁇ 20 ⁇ m is blended, the nuclear powder index described later in detail. It is possible to improve the granulation property by suitably managing the amount of the granulated sintered raw material, which is also effective in improving the productivity of the sintered ore, and sintering using this raw material.
  • the purpose is to propose a method for producing ore.
  • the present invention produces a granulated sintered raw material using a sintered blended raw material containing granular iron ore, and further uses the granulated sintered raw material to produce a sintered ore.
  • a method of manufacturing the above is proposed. That is, for the production of a granulated sintered raw material, paying attention to the nuclear powder index, which will be described in detail later, a granular iron ore having a nuclear powder index of 2.0 or more is blended in the sintered mixed raw material.
  • the sintered ore according to the present invention it is characterized by sintering using the granulated sintering raw material obtained as described above.
  • the nuclear powder index defined below is used as the granular iron ore;
  • Nuclear powder index ( ⁇ ) ⁇ (particle ratio of +1 mm) + (particle ratio of ⁇ 20 ⁇ m) ⁇ / (particle ratio of ⁇ 500 ⁇ m)
  • the present invention proposes a method for producing a granulated and sintered raw material characterized by using a material having a value of 2.0 or more.
  • this invention manufactures a sintered ore by granulating the sintering mixing raw material containing a granular iron ore secondly, and baking the obtained granulated sintering raw material with a sintering machine.
  • the present invention proposes a method for producing a sintered ore characterized by using a material having a value of 2.0 or more.
  • the granulated and sintered raw material is granulated using quick lime as a binder
  • the quick lime is externally added to the latter half of the granulation
  • At least a part of the granular iron ore in the sintered blending raw material contains 30 mass% or more of particles having a size of ⁇ 20 ⁇ m, Is a more preferred embodiment.
  • the core powder index indicating the blending ratio of +1 mm, ⁇ 20 ⁇ m, and ⁇ 500 ⁇ m granular iron ore is within a preferable range of 2.0 or more, and quick lime is added as a binder.
  • the inventors first investigated the influence of the particle size of the raw material (iron ore) on the granulation property when granulating the “sintered mixed raw material” to produce the “granulated sintered raw material”. That is, this investigation is a granulation test and an aeration test conducted by changing the iron ore sieved to each particle size to the base composition.
  • the raw materials iron ores A to D
  • Table 1 crystal water
  • the iron ore B is obtained by crushing the iron ore A and sieving it to -1 mm (less than 1 mm) and adding a certain amount to control air permeability.
  • iron ore D which is a coarse concentrate
  • iron ore sieved with (63 to 125/125 to 250/250 to 500/500 to 1000) ⁇ m sieve mesh was added.
  • Table 2 in order to investigate the influence of the particle size of the coarse concentrate, the above test was also conducted on the base composition containing no iron ore D (formulation 6).
  • the respective sintered blending raw materials are mixed for 3 minutes with a concrete mixer, and then granulated by adding water. Further, the obtained granulated particles are put into a cylindrical container of 150 mm ⁇ , 380 mmH.
  • the air volume measurement showing air permeability was performed under the condition of a negative pressure of 700 mmaq.
  • the moisture content of the granulated product was changed within the range of 6 to 10 mass%, and the moisture content at the time of the best aeration was used for each formulation. % was optimal, and in composition 6, 9 mass% was optimal.
  • blending 6 increased the appropriate granulation water
  • Iron ore with a large amount of crystal water generally has many pores, moisture penetrates into the iron ore during granulation, and requires more moisture than dense iron ore.
  • Formulations 1 to 5 although the particle size was different, the appropriate moisture content did not change because the iron ore species did not change.
  • the granulation phenomenon such as iron ore is a phenomenon in which fine iron ore adheres sequentially to the surface of the granular iron ore serving as core particles. Therefore, the adhesion of fine iron ore to the core particle surface is important for granulation. Therefore, a shear test was performed to measure the adhesive force affecting granulation. In this test, ⁇ 500 ⁇ m fine iron ore sieved with a 500 ⁇ m sieve was placed in a container (43 mm ⁇ ) that was a combination of a stationary mold and a movable mold, and compressed with 200 kgf by an upper piston, While reducing the vertical stress, the movable part was pulled horizontally with a pull gauge to measure the shear stress corresponding to the vertical stress.
  • the adhesive force the shear stress when the normal stress becomes 0 kgf was used.
  • the test was conducted on iron ore A and iron ores C to F in Table 3. Samples with a particle size of ⁇ 500 ⁇ m and samples with a particle size of 63 to 125 ⁇ m were evaluated for each iron ore, and a sample obtained by grinding iron ore D was also evaluated.
  • the iron ore adhesion (kPa) increases as the ratio (mass%) of ⁇ 63 ⁇ m or ⁇ 20 ⁇ m increases.
  • the ratios of ⁇ 63 ⁇ m and ⁇ 20 ⁇ m are measured by laser scattering / dispersion measuring method of the particle size of those obtained by sieving iron ore ( ⁇ 500 ⁇ m), those prepared in 63 to 125 ⁇ m, and those obtained by grinding iron ore D. It is the obtained result.
  • a granulation test and a sintering test were performed by changing the ratio of ⁇ 20 ⁇ m.
  • iron ore G and fine iron ore H that had been crushed were tested, although they were fine-grained iron ores, but few in ⁇ 20 ⁇ m.
  • the test conditions and results are as shown in Table 4 below.
  • the tests were performed in cases 1 and 2, with the nucleus / powder ratio being changed, the basicity being 2.1, and SiO 2 being constant. .
  • the sample was granulated with a drum mixer for 6 minutes and fired using a pan tester.
  • the sintered cake after baking when it is dropped once from a height of 2 m, the product with a particle size of +10 mm is made into a product, and the value obtained by dividing the weight by (sinter cake weight-floor covering weight) Toru.
  • the sintered production rate (t / (m 2 ⁇ h)) is a value obtained by dividing the product weight by the firing time and the cross-sectional area of the test pan.
  • granulated and sintered raw materials obtained by granulating iron ore (raw material) consisting of core particles and fine particles have particles slightly smaller than fine particles and core particles attached around the core particles (coating) It is normal to take the structure.
  • Such granulated and sintered raw materials are easily pulverized due to reduced strength because the surface coating layer absorbs moisture in the wet zone of the sintering machine. Voids in the layer (sintered raw material charging layer) may be reduced and air flow may be hindered. In order to solve this problem, it is important to maintain the strength of the granulated and sintered raw material in the wet zone.
  • the particles of +1 mm (1 mm or more) serve as core particles during granulation to promote the granulation action, and further, since the particles themselves are large, they have an effect of improving air permeability during sintering.
  • the moisture resistance increases and the ventilation resistance increases in the wet zone where the strength of the granulated particles decreases and the molten zone where the granulated sintered raw material melts, but +1 mm bone
  • the presence of the material particles serves to suppress a decrease in air permeability.
  • nuclear powder index ( ⁇ ) ⁇ (particle ratio of +1 mm) + (particle ratio of ⁇ 20 ⁇ m) ⁇ / (particle ratio of ⁇ 500 ⁇ m)
  • FIG. 6 shows the relationship between the nuclear powder index and the sintering production rate.
  • the sum of the particle ratios of +1 mm and ⁇ 20 ⁇ m with respect to the negatively affecting ⁇ 500 ⁇ m particles is 1.8 or more, preferably 1. It has been found that by setting it to 9 or more, particularly 2.0 or more, it is possible to produce a granulated and sintered raw material for maintaining preferable sinterability even when the -500 ⁇ m particle ratio is high. It was.
  • a method of adding quick lime as a binder in the latter half of the granulation process by the drum mixer is adopted.
  • adding quicklime as a binder has two effects. One of them is an action of absorbing water in the wet zone while leaving water and unreacted CaO, and is effective in suppressing the quasi-particles from being slurried.
  • Example 1 In this example, the following samples (basicity: 2.0, SiO 2 : 5.0 mass%) were granulated with a drum mixer for 6 minutes and sintered using a pot tester. When the sintered sinter cake is dropped once from a height of 2 m, a product with a particle size of +10 mm is made into a product, and the value obtained by dividing the weight by (sinter cake weight-floor mine weight) is the yield. did.
  • the sintering production rate (t / (m 2 ⁇ h)) was a value obtained by dividing the product weight by the firing time and the cross-sectional area of the test pan.
  • Example 2 This Example demonstrates the result of having examined the presence or absence of quicklime addition, and the timing of addition.
  • the nuclear powder index was 2.3, 2.2, and 2.2, respectively, with no quick lime, with quick lime (interior), with quick lime (exterior).
  • the effect on rate was investigated.
  • Other conditions are as follows. In this example, a sample (basicity: 2.1, SiO 2 : 4.7 mass%) was granulated with a drum mixer for 5 minutes, fired using a pan tester, and sintered.
  • the product with a particle size of +10 mm is made into a product, and the value obtained by dividing the weight by (sinter cake weight-bedstone weight) is used as the yield.
  • the rate (t / (m 2 ⁇ h)) was a value obtained by dividing the product weight by the firing time and the cross-sectional area of the test pan.
  • the effect of sheathing quicklime was also verified. That is, the following samples (basicity and SiO 2 : constant) were granulated with a drum mixer for 5 minutes and sintered using a pan tester. When the quick lime was packaged, the quick lime was added at a stage 1/10 of the granulation time of the drum mixer, and then calcined. When the sintered sinter cake is dropped once from a height of 2 m, the product whose particle size is +10 mm is made into a product, and the value obtained by dividing the weight by (sinter cake weight-floor mine weight) is the yield. The sintering production rate (t / (m 2 ⁇ h)) was determined by dividing the product weight by the firing time and the cross-sectional area of the test pan.
  • the production rate of quicklime was better than that of the case where it was installed. That is, it was found that when fine powder was added, the production rate was further improved by covering quicklime. In addition, in the case of quicklime addition, it was confirmed that the production rate is larger than that of [Example 1] because of the effect of quicklime addition.

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PCT/JP2018/008261 2017-03-31 2018-03-05 造粒焼結原料の製造方法および焼結鉱の製造方法 WO2018180233A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020217039814A KR102391484B1 (ko) 2017-03-31 2018-03-05 조립 소결원료의 제조 방법 및 소결광의 제조 방법
CN201880022859.9A CN110462070B (zh) 2017-03-31 2018-03-05 造粒烧结原料的制造方法及烧结矿的制造方法
KR1020197026468A KR20190117612A (ko) 2017-03-31 2018-03-05 조립 소결원료의 제조 방법 및 소결광의 제조 방법
BR112019019433-9A BR112019019433B1 (pt) 2017-03-31 2018-03-05 Método de fabricação de matéria-prima de sinterização granulada e método de fabricação de minério sinterizado

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JP2017069489A JP2018172704A (ja) 2017-03-31 2017-03-31 造粒焼結原料の製造方法および焼結鉱の製造方法
JP2017-069489 2017-03-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113817917A (zh) * 2021-08-05 2021-12-21 包头钢铁（集团）有限责任公司 一种基于铁矿石粒度组成的配矿方法

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JPS6260826A (ja) * 1985-09-11 1987-03-17 Kobe Steel Ltd 焼結原料の事前処理法
JP2006063375A (ja) * 2004-08-26 2006-03-09 Jfe Steel Kk 焼結用原料の製造方法
WO2012046848A1 (ja) * 2010-10-08 2012-04-12 新日本製鐵株式会社 鉄鉱石原料の造粒物の製造方法及び鉄鉱石原料の造粒物
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113817917A (zh) * 2021-08-05 2021-12-21 包头钢铁（集团）有限责任公司 一种基于铁矿石粒度组成的配矿方法

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JP2018172704A (ja) 2018-11-08
KR20190117612A (ko) 2019-10-16
KR20210151258A (ko) 2021-12-13
CN110462070B (zh) 2022-02-11
CN110462070A (zh) 2019-11-15
TW201842196A (zh) 2018-12-01
BR112019019433A2 (pt) 2020-04-14
KR102391484B1 (ko) 2022-04-26
BR112019019433B1 (pt) 2023-03-14

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