WO2016108256A1 - 焼結用擬似粒子およびその製造方法 - Google Patents
焼結用擬似粒子およびその製造方法 Download PDFInfo
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- WO2016108256A1 WO2016108256A1 PCT/JP2015/001243 JP2015001243W WO2016108256A1 WO 2016108256 A1 WO2016108256 A1 WO 2016108256A1 JP 2015001243 W JP2015001243 W JP 2015001243W WO 2016108256 A1 WO2016108256 A1 WO 2016108256A1
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- iron ore
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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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- 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
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- the present invention relates to, for example, a pseudo particle for sintering provided as a raw material for sintering on a pallet of a dwy toroid type sintering machine when a sintered ore for blast furnace is produced using a dwy toroid type sintering machine with downward suction, and It relates to the manufacturing method.
- sintered ore used as a raw material for a blast furnace is manufactured through the following processing method of a sintered raw material.
- a particle size of 10mm or less of iron ore, grain size 10mm following silica, serpentinite or, SiO 2 containing material made of nickel slag, limestone containing powdered CaO In a drum mixer, an appropriate amount of water is added to a raw material and a solid fuel system raw material that serves as a heat source such as powdered coke or anthracite, and the resulting mixture is granulated by mixing and granulating it.
- the blended raw material consisting of this granulated material is placed on a pallet of a Dwytroid type sintering machine so as to have an appropriate thickness, for example, 500 to 700 mm, and the solid fuel on the surface layer is ignited. Solid fuel is combusted while sucking air downward, and the sintered raw material blended by the combustion heat is sintered to form a sintered cake. This sintered cake is crushed and sized to obtain sintered ore having a certain particle size or larger, while those having a particle size smaller than that are returned to ore and reused as a sintering raw material.
- the sintered ore produced in this way has good reducibility, which is a factor that greatly affects the operation of the blast furnace.
- the reducibility of sintered ore is defined by JIS M8713 (JIS: Japanese Industrial Standard, hereinafter referred to as JIS).
- JIS-RI the reducibility of sintered ore
- ⁇ co gas utilization rate
- FIG. 3 there is a negative correlation.
- the reducibility (JIS-RI) of the sintered ore has a good negative correlation with the fuel ratio through the gas utilization rate ( ⁇ co) in the blast furnace, and improves the reducibility of the sintered ore.
- the fuel ratio in the blast furnace decreases.
- Fuel ratio (coal + coke consumption (kg / day)) / pig iron production (t / day)
- the cold strength of the sintered ore is also an important factor for ensuring air permeability in the blast furnace, and operations are performed with a lower limit standard for cold strength for each blast furnace. Therefore, it can be said that the sintered ore desirable as a blast furnace raw material is excellent in reducibility and has high cold strength.
- CS calcium ferrite
- CF calcium ferrite
- He hematite
- FeO which are main mineral structures forming sintered ore in Table 1.
- Four reducibility and tensile strength (cold strength) of CaO.xFeO.ySiO 2 and magnetite (Mg): Fe 3 O 4 are shown.
- the tensile strength was measured by a disk-shaped ore test piece and measured by a method specified by a compression test method (radial compression test or Brazilian test). As shown in Table 1, hematite (He) has a high reducibility, and calcium ferrite (CF) has a high tensile strength.
- the sintered structure suitable for the sintered ore generates calcium ferrite (CF) having high strength on the surface of the lump, and hematite having high reducibility toward the inside of the lump ( It is preferable that calcium silicate (CS) containing FeO having a reduced reducibility and strength is not generated as much as possible.
- CF calcium ferrite
- CS calcium silicate
- Patent Document 2 discloses that iron ore raw material is separated from limestone-based raw material and solid fuel-based raw material without requiring a large amount of equipment as a pretreatment of a process for producing sintered ore.
- pseudo particles having a laminated structure as a raw material, calcium ferrite (CF) having high strength was selectively generated on the surface, and hematite (He) having high reducibility was selectively generated toward the inside. It has been proposed that a sintered ore having a structure can be produced, and the sinter thus obtained has improved cold strength and improved reducibility.
- the iron ore and SiO 2 containing material containing a large amount of SiO 2 the pseudo particles separated from the limestone-based raw material and solid fuel based material sintered ore production If it is used, it is possible to delay the reaction between CaO and SiO 2 in the sintering process, and to suppress the formation of calcium silicate (CS) containing FeO having poor reducibility and low cold strength. Accordingly, it is possible to obtain a sintered ore in which calcium ferrite (CF) having high strength is selectively formed on the surface of the sintered ore and hematite (He) having high reducibility is selectively generated toward the inside of the sintered ore.
- CF calcium ferrite
- He hematite
- the inventors have intensively studied how to improve the reducibility of sintered ore produced by using pseudo-particles for sintering having a laminated structure in which iron ore materials are separated from limestone and solid fuel materials. As a result, the inventors have obtained new knowledge that it is effective to increase the advantages of the pseudo-particles for laminating a laminated structure by including a specific range amount of alkali metal in the iron ore raw material.
- the gist configuration of the present invention is as follows. 1.
- a pseudo-particle for sintering which includes at least an iron ore raw material, a limestone-based raw material, and a solid fuel-based raw material, which is used for producing a sintered ore for blast furnace, With the iron ore raw material as a core, the limestone-based raw material and the solid fuel-based raw material are arranged around the core,
- the core of the iron ore raw material is a pseudo-particle for sintering containing iron ore having an alkali metal content of 0.05 mass% or more.
- examples of the alkali metal include lithium, sodium, potassium, rubidium and cesium.
- sodium and potassium are suitable as iron ore raw materials for sintered ore.
- the core of the iron ore raw material includes a first layer of iron ore having an alkali metal content of less than 0.05 mass% and an iron ore having an alkali metal content of 0.05 mass% or more covering the surface of the first layer.
- the core of the iron ore raw material includes a first layer of iron ore having an alkali metal content of 0.05 mass% or more and an iron ore having an alkali metal content of less than 0.05 mass% covering the surface of the first layer.
- the iron ore having an alkali metal content of 0.05 mass% or more has an average particle diameter of 2 mm or more, and the iron ore having an alkali metal content of less than 0.05 mass% has an average particle diameter of less than 2 mm. 4.
- the pseudo-particle for sintering according to any one of 1 to 5, wherein the iron ore having an alkali metal content of 0.05 mass% or more has an alkali metal content of 0.30 mass% or less.
- a method for producing pseudo particles for sintering in which iron ore is adhered and then granulated to form a second layer, and a limestone-based material and a solid fuel-based material are adhered to the surface of the second layer and granulated.
- the iron ore with an alkali metal content of 0.05 mass% or more has an average particle diameter of 2 mm or more, and the iron ore with an alkali metal content of less than 0.05 mass% has an average particle diameter of less than 2 mm.
- a pseudo-particle for sintering for producing a sintered ore having excellent reducibility and high cold strength a pseudo-particle for sintering including at least an iron ore raw material, a limestone-based raw material, and a solid fuel-based raw material is used.
- the iron ore raw material is the core 1 and the limestone-based raw material and the solid fuel-based raw material layer 2 are arranged around the core 1.
- the iron ore raw material as the core 1 of the pseudo particles for sintering in a state free from limestone separated from the limestone-based raw material.
- the limestone raw material layer 2 covering the surface of the core 1 and the limestone raw material layer 2 of the solid fuel raw material produce a calcium ferrite (CF) melt at the interface between the limestone raw material and iron ore during the sintering process.
- CF calcium ferrite
- the resulting sintered ore has calcium ferrite (CF) with high strength on the surface, and hematite (He) with high reducibility toward the inside. It will have.
- the layer 2 may be a mixed layer of a limestone-based material and a limestone-based material, or a laminate of a limestone-based material layer (inner side) and a solid fuel-based material layer (outer side). In either case, calcium ferrite (CF) having high strength is formed on the surface of the sintered ore by the limestone contained in the layer 2.
- CF calcium ferrite
- the iron ore raw material of the core 1 contains iron ore having an alkali metal content of 0.05 mass% or more (hereinafter also referred to as high alkali iron ore). That is, by including a high alkali iron ore in the iron ore raw material of the core 1, the catalytic effect through the alkali metal and the close arrangement of calcium ferrite are realized, thereby further improving the reducibility of the sintered ore. Can do.
- the alkali metal content of the high alkali iron ore is less than 0.05 mass%, it is difficult to obtain the above effects.
- the alkali metal content of the high alkali iron ore having an alkali metal content of 0.05 mass% or more is preferably 0.30 mass% or less. Because if the alkali metal content is excessively high, the proportion of alkali metal obtained by the sintering machine increases even if the blending ratio is small, the amount of alkali metal in the blast furnace increases, and alkali metal accumulates in the furnace. As a result of the formation of an alkali metal adhesion layer on the furnace wall, there is a risk of hindering sound blast furnace operation. In addition, the dispersibility of the alkali metal in the sintered ore is lowered, and the above-described effect may be reduced.
- the blending ratio of the high alkali iron ore in the iron ore raw material is preferably 20 to 60 mass%. This is because if the blending ratio is less than 20 mass%, the effect of improving the reducing property is reduced. On the other hand, if it exceeds 60 mass%, the alkali metal ratio of the sintered ore obtained by the sintering machine is increased, and the alkali amount in the blast furnace is increased. May increase and accumulate in the furnace, forming an adhesion layer on the furnace wall and deteriorating blast furnace operation. In addition, an excessive increase in the reduced powder index of sintered ore deteriorates the air permeability of the blast furnace, and there is a concern that the coke ratio will increase.
- the remainder other than the highly alkaline iron ore in the iron ore raw material is iron ore having an alkali metal content of less than 0.05 mass% (hereinafter also referred to as general iron ore). Furthermore, the iron ore raw material, the SiO 2 raw material may be added as necessary.
- the iron ore raw material preferably constitutes the nucleus 1 in the following three forms I to III.
- the above-described action of the alkali metal can be exerted, and furthermore, each form has the following characteristics.
- the alkali metal is uniformly dispersed in the sintered ore by using the high alkaline iron ore as a mixed layer with general iron ore.
- the surface area of the alkali metal exhibiting catalytic action can be increased, and the reducibility can be increased by improving the catalytic effect.
- formation of a weak part can be suppressed also in the intensity
- Form II Lamination of a first layer made of general iron ore and a second layer made of high alkali iron ore covering the surface of the first layer.
- an alkali metal showing catalytic action is on the surface side of the nucleus. Therefore, the catalytic effect by the alkali metal can be sufficiently exhibited, and the reducibility can be increased.
- Form III Lamination of the first layer made of high alkali iron ore and the second layer made of general iron ore covering the surface of the first layer.
- the high alkali iron ore is the nucleus in the pseudo-particle before sintering.
- the high alkali iron ore has an average particle diameter of 2 mm or more, and the general iron ore has an average particle diameter of less than 2 mm.
- the average particle diameter regarding this iron ore is classified so that it may be divided into a plurality of particle sizes using a sieve, and is an arithmetic average of their weight ratio and representative particle size.
- the reason why the average particle size of the high alkali iron ore is preferably 2 mm or more is as follows.
- the ore with a relatively large particle size is unevenly distributed at the center of the pseudo particles, and the pseudo particles are placed on the surface of the iron ore after sintering.
- the formed calcium ferrite phase it is advantageous to reduce the proportion of alkali metal present.
- the reduction powdering property is deteriorated. Therefore, it is advantageous to produce a sintered ore having a low reduced powdering index that the average particle size of the high alkaline iron ore is 2 mm or more.
- the reason why the average particle size of general iron ore is preferably less than 2 mm is as follows. That is, in the process of granulating into pseudo particles, ores with a small average particle size are unevenly distributed outside the pseudo particles, so that a large amount of high alkali ore and calcium ferrite phase can be suppressed. .
- FIG. 8 shows an example of granulation flow (Method A) for producing a desirable pseudo particle structure of the present invention.
- this method A the high alkaline iron ore 1a and the general iron ore 1b and, if necessary, the SiO 2 -containing raw material 1c are charged from the inlet side inlet of the drum mixer 4 and granulated.
- the limestone-based raw material 2a and the solid fuel-based raw material 2b are added into the mixer 4 and granulated from the outlet of the outlet 4, and the limestone-based raw material 2a is surrounded around the core where the high alkali iron ore 1a and the general iron ore 1b are mixed.
- grain for sintering of the above-mentioned form I to which the solid fuel type raw material 2b was made to adhere is obtained.
- FIG. 9 shows an example of a granulation flow (Method B) for producing the pseudo particles of the present invention.
- the content of high alkali iron ore and general iron ore such as high alkali iron ore 1a containing about 0.05 to 1.0 mass% of alkali metal and having an average particle diameter of 2 mm or more, and alkali metal is 0.
- General iron ore 1b having an average particle size of less than 0.05 mass% and an average particle size of less than 2 mm, and optionally containing about 0.5 to 5.0% of SiO 2 and an average particle size of less than 2 mm, for example 0.1 to 1
- a fine-grained SiO 2 -containing raw material 1c iron ore, silica stone, serpentine, Ni slag, etc.
- the limestone raw material 2a or the limestone raw material 2a and the solid fuel raw material 2b (coke, anthracite, etc.) serving as a heat source are further added, mixed and granulated by the drum mixer 4, and the high alkali iron ore 1a is first added.
- FIG. 10 shows an example of granulation flow (Method C) for producing another desirable pseudo-particle structure of the present invention.
- the high-alkaline iron ore 1a and the general iron ore 1b and, if necessary, the SiO 2 -containing raw material 1c are added to the drum mixer 4 as a configuration in which a plurality of drum mixers are arranged (two sets in this example).
- the limestone-based raw material 2a or the limestone-based raw material 2a and the solid are charged from the inlet at the end of the broken line of the drum mixer 4 ′ in the final stage or from the outlet at the end of the solid line while being granulated by charging from the inlet side inlet.
- the fuel system raw material 2b is added and granulated.
- the solid fuel-based raw material 2b is then added and granulated, and the limestone-based raw material 2a and the solid fuel-based raw material 2b can be laminated and granulated.
- the limestone raw material 2a and the solid fuel raw material 2b have an average particle size of 0.5 mm or less, preferably 0.25 mm or less, so that they can be easily attached to each other, and the surface of the limestone raw material 2a is solid. It can be covered with the fuel system raw material 2b.
- a limestone-based material and a solid fuel-based material that is a heat source can be attached to the periphery of an iron ore material containing high alkali iron ore as a core.
- the pseudo particles are coated and granulated as described above. This delays the reaction between CaO and SiO 2 during the sintering process of the sintering raw material composed of pseudo particles, suppresses the formation of calcium silicate (CS) with low cold strength, and increases the strength of calcium ferrite (CF ), Hematite (He) with high reducibility is selectively generated toward the inside of the lump, and it is possible to stably produce sintered ore with many fine pores, excellent reducibility and high cold strength. Become.
- the sintered pseudo particles granulated by (Method A or B) shown in FIG. 8 or 9 of the present invention are respectively transported to a Dwightroid sintering machine. , Loaded on the pallet.
- iron ore raw material, SiO 2 containing raw material, limestone-based raw material, coke powder and the pseudo particles granulated by the processing method of mixing at the same time are transported to the Dwytroid sintering machine and charged on the pallet. It was. Then, after sintering on a pallet, the reducibility (JIS-RI), the reduction powder ratio (RDI), and the sintering strength (TI) were measured for the obtained sintered ore. The measurement results are shown in Table 3.
- the reducibility JIS-RI was measured according to JIS M8713.
- restoration powdering rate RDI was measured based on JISM8720.
- the sintering strength measured the rotational strength (tumbler strength TI) of the product sintered ore based on JIS M8712.
- No. 1 in which an iron ore raw material, a SiO 2 -containing raw material, a limestone raw material, and coke powder are mixed simultaneously.
- No. 1 in which a limestone-based raw material and coke powder are arranged around the iron ore raw material core according to the present invention.
- JIS-RI reducibility
- No. 1 in which a limestone-based material and coke powder are arranged around the iron ore material core.
- no. 6 to 28 are different in that the core of the iron ore raw material contains high alkali iron ore, but the reducibility is improved by this difference.
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Abstract
Description
ここで、ガス利用率(ηco)と燃料比は、下記のとおり定義される。
ηco=CO2(%)/(CO(%)+CO2(%))
なお、CO2(%)、CO(%)は、いずれも高炉の炉頂ガス中の体積%である。
燃料比=(石炭+コークスの使用量(kg/日))/銑鉄の生産量 (t/日)
したがって、高炉用原料として望ましい焼結鉱とは、被還元性に優れ、かつ冷間強度が高いものであると言える。
ここで、表1に焼結鉱を形成する主要鉱物組織であるカルシウムフェライト(CF):nCaO・Fe2O3、ヘマタイト(He):Fe2O3、FeOを含有するカルシウムシリケート(CS):CaO・xFeO・y SiO2、マグネタイト(Mg):Fe3O4の4つの被還元性、引張強さ(冷間強度)を示す。なお、引張強さは、円盤形の鉱石試験片を作製し、圧裂引張試験方法(radial compression testまたは、Brazilian test)で規定された方法で測定した。表1に示すように、被還元性の高いものはヘマタイト(He)であり、引張強さの高いものはカルシウムフェライト(CF)である。
しかしながら、ここで提案された従来方法では、CaOと鉄系原料中のSiO2やSiO2系原料が近接しているため、どうしてもFeOを含有するカルシウムシリケート(CS)が多く生成してしまい、カルシウムフェライト(CF)とヘマタイト(He)を主体とする構造には必ずしもならない場合が多かった。
1.高炉用焼結鉱の製造に供する、少なくとも鉄鉱石原料、石灰石系原料および固体燃料系原料を含む焼結用擬似粒子であって、
前記鉄鉱石原料を核として、該核の周囲に前記石灰石系原料および固体燃料系原料を配してなり、
前記鉄鉱石原料の核は、アルカリ金属の含有率が0.05mass%以上の鉄鉱石を含有する焼結用擬似粒子。
アルカリ金属を0.05mass%以上含有する鉄鉱石を含む鉄鉱石原料を混合して造粒した後に、該粒に石灰石系原料および固体燃料系原料を付着させて造粒する焼結用擬似粒子の製造方法。
アルカリ金属の含有率が0.05mass%未満の鉄鉱石およびSiO2含有原料を混合、造粒して第一層を形成し、該第一層の表面にアルカリ金属の含有率が0.05mass%以上の鉄鉱石を付着させてから造粒して第二層を形成し、該第二層の表面に石灰石系原料および固体燃料系原料を付着させて造粒する焼結用擬似粒子の製造方法。
アルカリ金属の含有率が0.05mass%以上の鉄鉱石を混合、造粒して第一層を形成し、該第一層の表面にアルカリ金属の含有率が0.05mass%未満の鉄鉱石を付着させてから造粒して第二層を形成し、該第二層の表面に石灰石系原料および固体燃料系原料を付着させて造粒する焼結用擬似粒子の製造方法。
被還元性に優れ、かつ冷間強度の高い焼結鉱を製造するための、焼結用擬似粒子としては、少なくとも鉄鉱石原料、石灰石系原料および固体燃料系原料を含む焼結用擬似粒子において、図7に示すように、前記鉄鉱石原料を核1として、該核1の周囲に前記石灰石系原料および固体燃料系原料の層2を配する構成が基本となる。
また、鉄鉱石原料における高アルカリ鉄鉱石以外の残部は、アルカリ金属の含有率が0.05mass%未満の鉄鉱石(以下、一般鉄鉱石ともいう)である。さらに、鉄鉱石原料には、必要に応じてSiO2原料を添加してもよい。
[形態I]:一般鉄鉱石と高アルカリ鉄鉱石との混合層
この形態Aでは、高アルカリ鉄鉱石を一般鉄鉱石との混合層とすることによって、アルカリ金属を焼結鉱内で均一に分散させる結果、触媒作用を示すアルカリ金属の表面積を増加させ、触媒効果の向上による被還元性の増加をはかることができる。また、焼結鉱の強度においても脆弱部位の形成を抑制できるため、冷間強度を確保できる。
この形態Bでは、触媒作用を示すアルカリ金属が核の表面側にあるため、アルカリ金属による触媒効果を十二分に発揮させることができ、被還元性の増加をはかることができる。
この形態Cでは、焼結前の擬似粒子において高アルカリ鉄鉱石が核の内側にあるため、焼結鉱の表面に形成されるカルシウムフェライト相内における、アルカリ金属の存在割合を低下させる結果、アルカリ金属の触媒作用を損なうことなく還元粉化性を向上することが可能になる。
すなわち、擬似粒子に造粒する過程において、平均粒径の小さい鉱石は擬似粒子の外側に偏在することになるため、高アルカリ鉱石とカルシウムフェライト相が多量に混合されるのを抑制することができる。
まず、図8に、本発明の望ましい擬似粒子構造を製造するための造粒フロー例(方法A)を示す。この方法Aでは、上記した高アルカリ鉄鉱石1aおよび一般鉄鉱石1bと、さらに必要に応じてSiO2含有原料1cをドラムミキサー4の入り側装入口から装入して造粒しつつ、ドラムミキサー4の出側排出口から石灰石系原料2aおよび固体燃料系原料2bをミキサー4内に添加して造粒し、高アルカリ鉄鉱石1aおよび一般鉄鉱石1bが混合した核の周囲に石灰石系原料2aおよび固体燃料系原料2bを付着させた、上記した形態Iの焼結用擬似粒子が得られる。
Claims (14)
- 高炉用焼結鉱の製造に供する、少なくとも鉄鉱石原料、石灰石系原料および固体燃料系原料を含む焼結用擬似粒子であって、
前記鉄鉱石原料を核として、該核の周囲に前記石灰石系原料および固体燃料系原料を配してなり、
前記鉄鉱石原料の核は、アルカリ金属の含有率が0.05mass%以上の鉄鉱石を含有する焼結用擬似粒子。 - 前記鉄鉱石原料の核は、アルカリ金属の含有率が0.05mass%未満の鉄鉱石による第一層と、該第一層の表面を覆うアルカリ金属の含有率が0.05mass%以上の鉄鉱石による第二層とを有する請求項1に記載の焼結用擬似粒子。
- 前記鉄鉱石原料の核は、アルカリ金属の含有率が0.05mass%以上の鉄鉱石による第一層と、該第一層の表面を覆うアルカリ金属の含有率が0.05mass%未満の鉄鉱石による第二層とを有する請求項1に記載の焼結用擬似粒子。
- 前記鉄鉱石原料は、アルカリ金属の含有率が0.05mass%以上の鉄鉱石を20mass%以上含有する請求項1から3のいずれかに記載の焼結用擬似粒子。
- 前記アルカリ金属の含有率が0.05mass%以上の鉄鉱石は平均粒径が2mm以上であり、前記アルカリ金属の含有率が0.05mass%未満の鉄鉱石は平均粒径が2mm未満である請求項1から4のいずれかに記載の焼結用擬似粒子。
- 前記アルカリ金属の含有率が0.05mass%以上の鉄鉱石は、アルカリ金属の含有率が0.30mass%以下である請求項1から5のいずれかに記載の焼結用擬似粒子。
- 前記核の周囲に前記石灰石系原料および固体燃料系原料を積層して配してなる請求項1から6のいずれかに記載の焼結用擬似粒子。
- 前記核の周囲に前記石灰石系原料および固体燃料系原料の混合層を配してなる請求項1から7のいずれかに記載の焼結用擬似粒子。
- 高炉用焼結鉱の製造に供する、少なくとも鉄鉱石原料、石灰石系原料および固体燃料系原料を混合して造粒するに際し、
アルカリ金属を0.05mass%以上含有する鉄鉱石を含む鉄鉱石原料を混合して造粒した後に、該粒に石灰石系原料および固体燃料系原料を付着させて造粒する焼結用擬似粒子の製造方法。 - 高炉用焼結鉱の製造に供する、少なくとも鉄鉱石原料、石灰石系原料および固体燃料系原料を混合して造粒するに際し、
アルカリ金属の含有率が0.05mass%未満の鉄鉱石およびSiO2含有原料を混合、造粒して第一層を形成し、該第一層の表面にアルカリ金属の含有率が0.05mass%以上の鉄鉱石を付着させてから造粒して第二層を形成し、該第二層の表面に石灰石系原料および固体燃料系原料を付着させて造粒する焼結用擬似粒子の製造方法。 - 高炉用焼結鉱の製造に供する、少なくとも鉄鉱石原料、石灰石系原料および固体燃料系原料を混合して造粒するに際し、
アルカリ金属の含有率が0.05mass%以上の鉄鉱石を混合、造粒して第一層を形成し、該第一層の表面にアルカリ金属の含有率が0.05mass%未満の鉄鉱石を付着させてから造粒して第二層を形成し、該第二層の表面に石灰石系原料および固体燃料系原料を付着させて造粒する焼結用擬似粒子の製造方法。 - 前記アルカリ金属の含有率が0.05mass%以上の鉄鉱石は平均粒径が2mm以上であり、前記アルカリ金属の含有率が0.05mass%未満の鉄鉱石は平均粒径が2mm未満である請求項7から11のいずれかに記載の焼結用擬似粒子の製造方法。
- 前記石灰石系原料と固体燃料系原料との混合粉を付着させて造粒する請求項7から12のいずれかに記載の焼結用擬似粒子の製造方法。
- 前記石灰石系原料を付着した後、さらにその石灰石系原料層の外層部に固体燃料系原料を付着させて造粒する請求項7から12のいずれかに記載の焼結用擬似粒子の製造方法。
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