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WO2025211234A1 - Procédé de production de minerai fritté et procédé d'utilisation de biomasse d'acide silicique pour haut-fourneau - Google Patents

Procédé de production de minerai fritté et procédé d'utilisation de biomasse d'acide silicique pour haut-fourneau

Info

Publication number
WO2025211234A1
WO2025211234A1 PCT/JP2025/012142 JP2025012142W WO2025211234A1 WO 2025211234 A1 WO2025211234 A1 WO 2025211234A1 JP 2025012142 W JP2025012142 W JP 2025012142W WO 2025211234 A1 WO2025211234 A1 WO 2025211234A1
Authority
WO
WIPO (PCT)
Prior art keywords
ore
biomass
blast furnace
silicic acid
sintered ore
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/JP2025/012142
Other languages
English (en)
Japanese (ja)
Inventor
政洋 関屋
武司 堤
哲也 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of WO2025211234A1 publication Critical patent/WO2025211234A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • 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

Definitions

  • the present invention relates to a method for producing sintered ore and a method for using silica biomass in a blast furnace.
  • Sintered ore which is used to produce slag in blast furnaces, is produced by sintering a granulated raw material consisting of a mixture of iron ore as the primary raw material, SiO2 - based auxiliary raw materials such as silica, CaO-based auxiliary raw materials such as limestone, sintered ore return ore of a certain size or less, and carbonaceous materials such as coke fines.
  • the auxiliary raw materials used in the production of sintered ore are used to adjust the sinterability of the sintered ore.
  • Patent Document 1 discloses an invention in which sintered raw material is made into pseudo-particles by adding auxiliary raw materials containing SiO2 and/or MgO to the granulated raw material at 1.5 to 6 wt % of the granulated raw material, and the pseudo-particles are then charged to the bottom layer of the sintered raw material on a sintering pallet.
  • This document claims that this invention can ensure the necessary amounts of SiO2 and MgO to adjust the blast furnace slag composition.
  • this invention claims that it can maintain smooth blast furnace operation without lowering the furnace top temperature.
  • Methods for reducing CO2 emissions include (a) reducing the amount of carbon in inputs, (b) capturing CO2 in outputs, and (c) replacing conventional coal, oil, etc. with carbon-free carbon sources.
  • Patent Document 2 discloses an invention that uses biochar, such as oil palm kernel shell charcoal, as a carbon-free carbon source for the carbonaceous material used in sintering.
  • biomass also known as silicate biomass due to its high ash content
  • biomass such as rice husks and straw
  • biochar derived from silicate biomass can be problematic due to its high ash content of around 30-50%.
  • biochar derived from silicate biomass not only promises a stable supply, but also has sufficient properties as a carbon source, with a fixed carbon content of around 15-50% and a unit calorific value of around 14-28 MJ/kg.
  • Patent Document 2 which describes the use of biochar in a sintered ore manufacturing method, also fails to explicitly address the issue of high ash content in biochar derived from silicate biomass.
  • the biochar described in the document is oil palm kernel shell charcoal, and the main components of the biochar exemplified in the document are 81.0-89.5% by mass fixed carbon, 7.2-9.2% by mass ash, and 3.2-9.8% by mass volatile matter.
  • the data disclosed in the document for the intended substitute, coke fines have fixed carbon content of 86.0% by mass, ash content of 12.9% by mass, and volatile matter of 1.1% by mass.
  • the intended substitute, anthracite has fixed carbon content of 88.5% by mass, ash content of 5.0% by mass, and volatile matter of 6.4% by mass.
  • the component composition of oil palm kernel shell coal is comparable to that of the coke breeze and anthracite it replaces, so there is no need to specifically address the issue of ash content.
  • biochar derived from silicate biomass with a high ash content can be used as is as the carbonaceous material in the granulated raw material for the sintering raw material to be made into pseudo-particles as described in Patent Document 1. If biochar derived from silicate biomass were used as a heat source for sintering to produce sintered ore, its high ash content would directly affect the adjustment of blast furnace slag basicity and slag fluidity, which are the objectives of Patent Document 1.
  • the present invention therefore aims to provide a method for producing sintered ore that utilizes biochar derived from silicate biomass, and a method for using silicate biomass in a blast furnace.
  • a method for producing sintered ore by a Dwight Lloyd sintering machine using a granulated raw material containing fine iron ores, a composition-adjusting sinter material, return ore, and a carbonaceous material A method for producing sintered ore, in which part or all of the carbonaceous material and part or all of the silicon oxide content of the component-adjusted welding material are replaced with fixed carbon and silicon oxide in biochar obtained by dry distillation of silicic acid biomass.
  • a method for utilizing silicic acid biomass in a blast furnace comprising charging sintered ore produced using a granulated raw material that is a blend of fine iron ores, a composition-adjusting solder, return ore, and a carbonaceous material, in which part or all of the carbonaceous material and part or all of the silicon oxide content of the composition-adjusting solder are replaced with fixed carbon and silicon oxide in biochar obtained by dry distillation of silicic acid biomass, into the top of the blast furnace.
  • some or all of the carbonaceous material in the granulated raw material is replaced with fixed carbon from biochar derived from silicic acid biomass, thereby contributing to the reduction of CO2 emissions in the steel industry. Furthermore, according to the present invention, some or all of the silicon oxide content of the composition-adjusted welding material in the granulated raw material is directly replaced with silicon oxide from biochar derived from silicic acid biomass, without adversely affecting the basicity of the melt during sintering or the basicity of the melt in a blast furnace.
  • biochar derived from silicic acid biomass which is produced in large quantities in Japan each year, is used as the raw material containing both the carbonaceous material in the granulated raw material and the SiO2 -based auxiliary material in the composition-adjusted welding material, thereby providing advantages in terms of procurement.
  • a new application for biochar derived from silicic acid biomass which has previously been limited in its applications due to its high ash content, can be effectively utilized to simultaneously utilize both fixed carbon and silicon oxide.
  • the present invention provides a method for producing sintered ore and a method for using silica biomass in a blast furnace, which contribute to the procurement of biochar and the reduction of CO2 emissions in the steel industry without adversely affecting the sintering reaction during sintering or the basicity of blast furnace slag.
  • FIG. 1 is a flowchart illustrating a method for producing sintered ore according to an embodiment of the present invention.
  • Sintered ore is one of the raw materials charged into the top of a blast furnace.
  • Iron ore a raw material for a blast furnace
  • fine ore which would impair the air permeability inside the furnace if left as is, can be baked to form sintered ore, and iron-containing dust recovered within steelworks can be agglomerated with hydraulic cement to form unbaked agglomerated ore.
  • Sintered ore according to an embodiment of the present invention is produced in a Dwight Lloyd sintering machine using a granulated raw material that is a blend of fine iron ores, a composition-adjusting solder, return ore, and a carbonaceous material, as shown in Figure 1.
  • a granulated raw material that is a blend of fine iron ores, a composition-adjusting solder, return ore, and a carbonaceous material, as shown in Figure 1.
  • part or all of the carbonaceous material and part or all of the silicon oxide content of the composition-adjusting solder are replaced by fixed carbon and silicon oxide in biochar obtained by dry distillation of silicic acid biomass.
  • the method for utilizing silica biomass in a blast furnace in which the sintered ore produced in this manner is charged into the top of the blast furnace, is another embodiment of the present invention. Note that, here, the method for producing sintered ore according to this embodiment and the method for utilizing silica biomass in a blast furnace according to other embodiments will be described together without
  • the method for producing sintered ore according to an embodiment of the present invention is primarily comprised of substituting biochar obtained by dry distillation of silicate biomass for the silicon oxide portion of the carbonaceous material and component-adjusted flux used as the granulation raw material, but is otherwise the same as a typical method for producing sintered ore. Therefore, we will begin by explaining the typical method for producing sintered ore, which is the premise of this embodiment.
  • gangue (slag) components such as SiO 2 , Al 2 O 3 , and MgO, as well as iron oxide, melt (assimilate) into the molten liquid, and the coarse iron ore particles are bonded together through this molten liquid, resulting in sintering.
  • the main reactions in the sintering reaction are the initial melt formation caused by the reaction between Fe2O3 in the iron ore and CaO in the limestone, followed by the melting reaction of this melt with the auxiliary materials and gangue components such as SiO2 and iron oxide in the iron ore.
  • This reaction is called the assimilation reaction.
  • the assimilation reaction proceeds excessively and the amount of melt generated increases dramatically, uneven sintering occurs due to poor permeability in the sintered layer, significantly reducing yield and strength.
  • the assimilation reaction does not proceed, the amount of melt that bonds unmelted iron ore particles together decreases, resulting in a decrease in product yield and strength of the sintered ore.
  • This sintering reaction can be controlled by controlling the basicity (CaO/SiO2 ) of the melt generated during sintering within a predetermined range using a composition-adjusting flux in the granulation raw material.
  • the method for producing sintered ore involves controlling the basicity (CaO/SiO2 ) of the melt produced during sintering within a predetermined range by using silicon oxide contained in biochar derived from silicic acid biomass as the SiO2 -based auxiliary material in the composition-adjusting flux blended with the granulated raw material.
  • the predetermined range for the basicity (CaO/SiO2 ) is, for example, 1.0 to 2.0.
  • the fixed carbon contained in the biochar derived from silicic acid biomass, together with the silicon oxide is also utilized as a carbonaceous material blended with the granulated raw material and used as a heat source.
  • the fixed carbon as a carbonaceous material and the silicon oxide as the silicon oxide component of the component-adjusted flux can already be said to be mixed together, but this does not pose any problems.
  • the biochar derived from silicic acid biomass according to this embodiment can also be mixed with other granulated raw materials such as fine iron ore by going through the steps of a conventional sintered ore manufacturing method.
  • Silicate biomass refers to plants containing silica (silica plants) or parts thereof such as their leaves and stems, and includes rice and wheat husks and straw, bamboo leaves, and corn leaves and stems.
  • Biochar derived from siliceous biomass is a carbonaceous material obtained by dry distilling siliceous biomass. The dry distillation method is not important, but dry distillation using a rotary kiln is an example. As mentioned above, biochar derived from siliceous biomass has a fixed carbon content of approximately 15-50% by mass, an ash content of approximately 30-50% by mass, and a unit calorific value of approximately 14-28 MJ/kg.
  • the amounts of auxiliary materials, such as limestone and silica, blended with raw materials such as iron ore, are usually adjusted to keep the basicity (CaO/SiO2 ) of the melt of all raw materials charged to the blast furnace within a predetermined range.
  • the amount of the composition-adjusting melt in this embodiment is preferably controlled so that the basicity (CaO/SiO2 ) of the melt in the blast furnace falls within a predetermined range, even for sintered ore alone. Therefore, it is preferable to prioritize the adjustment of the basicity of the melt during the assimilation reaction of sintered ore, while also taking into consideration the basicity of the melt in the blast furnace.
  • the basicity (CaO/ SiO2 ) of the entire sintering raw material can be adjusted by adjusting the blending pattern of each raw material so that the basicity calculated from the total amount of CaO and SiO2 contained in each of the fine iron ores and the composition-adjusted melt is within a predetermined range.
  • some or all of the silicon oxide content of the composition-adjusted welding material is replaced with silicon oxide in biochar derived from silicate biomass, without changing the silicon oxide content of the entire sintered ore. Therefore, using biochar derived from silicate biomass in sintered ore does not adversely affect the assimilation reaction during the production of sintered ore.
  • the fixed carbon and silicon oxide amounts per unit amount of biochar derived from silicic acid biomass are expected to fluctuate.
  • the fixed carbon and silicon oxide amounts per unit amount of the incoming biochar derived from silicic acid biomass are confirmed.
  • any of the fully applicable blended raw materials for the granulated raw material to be used as the sintering raw material is completely substituted, while the other blended raw material that is insufficient is partially substituted, thereby determining the blending ratio of the raw materials.
  • the fixed carbon and silicon oxide amounts of the biochar derived from silicic acid biomass may each be used as part of the blended raw materials for the sinter ore.
  • the raw materials to be blended into the normal granulated raw materials which are the sinter raw materials used in the calculations, are assumed to be mixed iron ore as fine iron ore and limestone and silica as composition-adjusting sintering materials.
  • the silicon oxide content and SiO2 and CaO used to calculate the basicity of the entire granulated raw materials which are the subject of the calculations, strictly speaking, the contents in the fine iron ore and return ore must also be taken into account.
  • the calculations were made using only the raw materials for composition-adjusting sintering materials.
  • carbonaceous materials are consumed as a heat source for sintering and do not remain in the final sintered ore product, so they are shown as separate quantities relative to the other granulated raw materials.
  • the components and overall properties of the normal granulated raw material that will be used as the sintering raw material for the specific calculation are as follows: Fine iron ore (mixed iron ore): 58.1% by mass ⁇ Component adjustment welding materials (the following two types) ⁇ Limestone: 17.9% by mass ⁇ Silica stone: 5.0% by mass ⁇ Return ore: 19.0% by mass Carbon material (coke powder) (extraneous number): 4.0% by mass Overall properties of granulated raw material Basicity CaO/SiO2: 2.0
  • the biochar derived from silicate biomass was rice husk charcoal dry-distilled at 500°C, and its composition was as follows: ⁇ Fixed carbon: 28% by mass Volatile content: 35% by mass ⁇ Ash content: 38% by mass (including SiO 2 : 34% by mass)

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

La présente invention propose un procédé de production d'un minerai fritté et un procédé d'utilisation d'une biomasse d'acide silicique pour un haut-fourneau, les procédés utilisant du charbon de biomasse qui est dérivé d'une biomasse d'acide silicique. La présente invention concerne un procédé de production d'un minerai fritté par une machine de frittage de Dwight-Lloyd, et utilise une matière de départ granulée qui est obtenue par mélange d'un minerai de fer pulvérulent, d'un flux de réglage de composant, d'un minerai de retour et d'une matière carbonée. Du carbone et de l'oxyde de silicium fixes dans le charbon de biomasse qui est obtenu par soumission d'une biomasse d'acide silicique à un traitement de distillation à sec sont appliqués à une partie ou à la totalité de la matière carbonée et à une partie ou à la totalité de la teneur en oxyde de silicium dans le flux de réglage de composant à mélanger dans la matière de départ granulé. Dans ce procédé d'utilisation d'une biomasse d'acide silicique pour un haut-fourneau, un minerai fritté qui est obtenu comme décrit ci-dessus est chargé à partir de la partie supérieure de fourneau du haut-fourneau.
PCT/JP2025/012142 2024-04-02 2025-03-26 Procédé de production de minerai fritté et procédé d'utilisation de biomasse d'acide silicique pour haut-fourneau Pending WO2025211234A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2024059532 2024-04-02
JP2024-059532 2024-04-02

Publications (1)

Publication Number Publication Date
WO2025211234A1 true WO2025211234A1 (fr) 2025-10-09

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PCT/JP2025/012142 Pending WO2025211234A1 (fr) 2024-04-02 2025-03-26 Procédé de production de minerai fritté et procédé d'utilisation de biomasse d'acide silicique pour haut-fourneau

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WO (1) WO2025211234A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102230077A (zh) * 2011-05-31 2011-11-02 华中科技大学 一种用于生产烧结矿的混合料
JP2013237876A (ja) * 2012-05-11 2013-11-28 Nippon Steel & Sumitomo Metal Corp アブラ椰子核殻炭による焼結鉱製造方法
US20180320245A1 (en) * 2017-05-04 2018-11-08 Nu-Iron Technology, Llc Cokeless sinter blend compositions
CN110819793A (zh) * 2019-10-28 2020-02-21 鞍钢股份有限公司 一种厚料层烧结生产方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102230077A (zh) * 2011-05-31 2011-11-02 华中科技大学 一种用于生产烧结矿的混合料
JP2013237876A (ja) * 2012-05-11 2013-11-28 Nippon Steel & Sumitomo Metal Corp アブラ椰子核殻炭による焼結鉱製造方法
US20180320245A1 (en) * 2017-05-04 2018-11-08 Nu-Iron Technology, Llc Cokeless sinter blend compositions
CN110819793A (zh) * 2019-10-28 2020-02-21 鞍钢股份有限公司 一种厚料层烧结生产方法

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