WO2011129388A1 - 焼結鉱の製造方法 - Google Patents

焼結鉱の製造方法 Download PDF

Info

Publication number
WO2011129388A1
WO2011129388A1 PCT/JP2011/059245 JP2011059245W WO2011129388A1 WO 2011129388 A1 WO2011129388 A1 WO 2011129388A1 JP 2011059245 W JP2011059245 W JP 2011059245W WO 2011129388 A1 WO2011129388 A1 WO 2011129388A1
Authority
WO
WIPO (PCT)
Prior art keywords
coke
mass
coated
raw material
coating
Prior art date
Application number
PCT/JP2011/059245
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
一昭 片山
俊次 笠間
Original Assignee
新日本製鐵株式会社
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.)
Filing date
Publication date
Application filed by 新日本製鐵株式会社 filed Critical 新日本製鐵株式会社
Priority to BR112012026123-1A priority Critical patent/BR112012026123B1/pt
Priority to CN201180018529.0A priority patent/CN102844449B/zh
Priority to KR1020127026621A priority patent/KR101311575B1/ko
Priority to JP2011536636A priority patent/JP4870247B2/ja
Publication of WO2011129388A1 publication Critical patent/WO2011129388A1/ja

Links

Images

Classifications

    • 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
    • C22B1/242—Binding; Briquetting ; Granulating with binders
    • C22B1/244—Binding; Briquetting ; Granulating with binders organic
    • C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
    • B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/78—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali- or alkaline earth metals

Definitions

  • the present invention relates to a method for producing a sintered ore.
  • the present invention relates to a method for producing sintered ore that can reduce NOx contained in exhaust gas while ensuring or improving productivity.
  • NOx nitrogen oxides
  • a means for reducing NOx there is an exhaust gas denitration technique using ammonia as a reducing agent.
  • the construction cost is high and the operation cost is high because ammonia is expensive.
  • anthracite with a low nitrogen content but the mining environment of anthracite with a low nitrogen content has deteriorated due to resource depletion, and its usage is limited.
  • Patent Document 1 removal techniques NOx by the catalyst composed mainly of CaO-Fe x O composite oxide CaO content of 5 to 50% by weight is disclosed ing.
  • a granulated body (S type) in which the catalyst is coated on the surface of coarse coke granules (S type) or a granulated body (P type) in which fine coke granules and a fine powder of the catalyst are mixed is sintered. Used as a raw material.
  • Patent Document 2 discloses a method for producing a carbon-containing sintered ore using a non-combustible bulk carbon source in which a granular carbon source and a binder are mixed and granulated, and the surface is coated with a binder.
  • Patent Document 1 in the case of a NOx removal technique using a granulated material (P-type) in which the fine coke particles and the fine powder catalyst are mixed, the NOx reduction effect in a low temperature region of 1,000 ° C. or less. There is a problem that is small. As will be described later, a large amount of NOx due to the combustion of coke is generated in a low temperature region. Therefore, it is considered that the fine coke granules in the granulated body (P type) burn in a low temperature region and a large amount of NOx is generated, and the effect of removing NOx is reduced.
  • P-type granulated material
  • An object of the present invention is to provide a method for producing a sintered ore that can (1) suppress generation of NOx in a low temperature region and (2) sufficiently secure or improve the productivity of a sintering machine. That is.
  • the coating containing 36 mass% or more of Ca derived from a lime-type raw material is more than 2 mass% with respect to the said carbonaceous material on the carbonaceous material surface, and The surface-coated carbon material coated at a ratio of less than 50% by mass is included in the blended coal as a sintered fuel.
  • the blended coal may include the surface-coated carbon material of 10% by mass to 100% by mass.
  • the said lime-type raw material is calcium hydroxide
  • cover may contain 67 mass% or more of calcium hydroxide. .
  • the layer thickness of the coating is 5 ⁇ m or more and It may be 500 ⁇ m or less.
  • the surface coated coal is added to the blended raw material. Materials may be added and mixed.
  • the surface-coated carbon material may be added to and mixed with the blended raw material.
  • particles having a particle size of less than 0.5 mm are 20% by mass or less, and particles having a particle size of 0.5 mm or more and 3 mm or less are used.
  • the carbonaceous material may have a particle size distribution of 40% by mass or more.
  • FIG. 1 shows the relationship between the NOx conversion rate by coke combustion and the temperature.
  • the NOx conversion rate is the ratio (molar percentage) at which nitrogen atoms in the burned fuel are converted to NOx. Specifically, this NOx conversion rate is calculated by equation (1) described later.
  • NOx is generated mainly by oxidation of nitrogen in the carbonaceous material during sintering.
  • FIG. 1 it has been confirmed that a large amount of NOx is produced at a low temperature of 1,000 ° C. or less. Therefore, in order to suppress the generation of NOx, it is important to burn the carbonaceous material at a high temperature as much as possible.
  • a carbon material shows the solid fuel used for coke, anthracite, and other sintered ore manufacture.
  • the fine powder in the charcoal burns at a low temperature and increases NOx.
  • the relationship between the carbonaceous material particle size (coke particle size) and the amount of NOx generated is shown in FIG.
  • the fine powder in the carbonaceous material is considered to increase NOx because the combustion speed is high and combustion is completed at a low temperature. Therefore, it is considered that the amount of NOx generated can be reduced if the fine carbonaceous material having a particle size of 0.5 mm or less can be removed.
  • the carbonaceous material (particles) having a particle size of more than 0 mm and less than 0.5 mm is desirably 20% by mass or less, and 11% by mass or less. Is more desirable, and it is especially desirable that it is 5 mass% or less. This is because, as shown in FIG. 2, the amount of NOx generated in the carbonaceous material of less than 0.5 mm is large. Further, the carbonaceous material (particles) having a particle size of 0.5 mm or more and 3 mm or less is desirably 40% by mass or more, and particularly desirably 70% by mass or more.
  • Patent Document 1 by using the carbonaceous material of CaO content was coated with 5 to 50 wt% of CaO-Fe x O type composite oxide on the surface, carbon by the catalytic action of CaO-Fe x O composite oxide It is disclosed that NOx produced during combustion of a material is reduced or decomposed to be removed.
  • CaO-Fe x O composite oxides restrict the CaO content of 50 wt% or less has a low melting point, to melt at a high temperature range of not lower than 1200 ° C., is to coat it on the surface of the carbonaceous material NOx reduction effect is expected.
  • CaO—Fe x O-based composite oxide is manufactured by melt-molding a lime-based raw material and iron ore, it is more expensive than a lime-based raw material used as an auxiliary material in normal sintering. .
  • a lime-based material used as an auxiliary material in normal sintering is used as a coating on the surface of a carbon material without using an expensive oxide as described above.
  • a surface-coated carbon material in which a coating having a Ca content of 36% by mass or more is used for at least a part of the blended coal charged into the sintering machine as a fuel.
  • the blended charcoal is a carbon material used as a solid fuel (sintered fuel) by being mixed with a sintering raw material (blended raw material) other than the blended coal before being charged into the sintering machine.
  • the coating layer on the surface of the carbon material desirably includes at least one selected from the group consisting of calcium hydroxide, calcium carbonate, calcium oxide, and calcium fluoride.
  • lime-based raw materials such as calcium hydroxide (slaked lime), calcium carbonate (limestone), lime milk, fluorite, and mixtures thereof can be used.
  • the lime-based raw material functions as a solvent because it easily reacts with iron ore powder present at a high temperature to produce calcium ferrite having a low melting point.
  • oxygen is supplied to the surface of the carbon material, so that the combustion of the carbon material is promoted and the carbon material can be burned at a high temperature.
  • this calcium ferrite (melt) solid ash remaining on the surface during combustion of the carbonaceous material is dissolved, and combustion of the carbonaceous material at a high temperature can be further promoted.
  • the lime-based raw material contained in the coating layer is particularly preferably calcium hydroxide.
  • Calcium hydroxide acts as a binder and forms a coating layer that is strongly adhered to the surface of the carbonaceous material, so that the surface of the carbonaceous material in the conveying process until mixing with other blended raw materials and charging the raw material into the sintering machine. Desorption of the coating can be suppressed. It is desirable that the coating on the surface of the carbon material contains 36 mass% or more of Ca derived from the lime-based raw material. When the Ca content in the coating is less than 36% by mass, the reaction rate between the surrounding iron ore and the coating (the lime-based raw material in the coating) is not sufficient, so the melting reaction on the carbonaceous material surface is slow.
  • the coating more preferably contains 67% by mass or more of calcium hydroxide, and particularly preferably 100% by mass. Furthermore, when calcium carbonate, lime milk, fluorite, or the like is used as the lime-based raw material, it is desirable that the coating contains 90% by mass or more of these lime-based raw materials and mixtures, particularly 100% by mass. desirable.
  • NOx is generated by burning the carbonaceous material at a low temperature of 1,000 ° C. or lower. Therefore, in order to suppress NOx generation during sintering, the carbonaceous material is controlled while suppressing combustion of the carbonaceous material at low temperature. It is necessary to burn at as high a temperature as possible. In the low temperature region of 1,000 ° C. or lower, since the carbonaceous material surface is covered with the coating layer, combustion of the carbonaceous material can be suppressed and generation of NOx can be suppressed. However, in a high temperature region of 1,200 ° C. or higher, CaO derived from the lime-based raw material in the coating layer reacts with surrounding ore to generate a melt of low-melting calcium ferrite and melt down.
  • the coating layer on the surface of the carbon material generates a calcium ferrite melt
  • the combustion temperature of the carbon material has already reached a high temperature region of 1,200 ° C. or higher, so NOx generation occurs.
  • the charcoal can be actively burned and productivity can be improved. That is, in the present embodiment, the apparent combustion start temperature of the carbon material can be increased to realize rapid combustion of the carbon material in a high temperature region, and the maximum temperature at the time of combustion of the carbon material can be efficiently increased. it can.
  • a compounding raw material is a raw material mixed and used before charging into a sintering machine.
  • the example which used the fine iron ore other than the lime-type raw material as a coating in a surface covering carbon material was shown, it is not limited only to this example. That is, if the Ca content derived from the lime-based material in the coating is 36% by mass or more, fine iron ore and other auxiliary materials can be used as the coating material other than the lime-based material.
  • the other auxiliary materials mean auxiliary materials (silica stone, serpentine, peridotite, etc.) other than lime-based materials.
  • a blended raw material (hereinafter referred to as a first blended raw material) excluding raw materials used for the production of the surface-coated carbon material is granulated by a mixing granulator such as a drum mixer.
  • the first blended raw material includes at least iron ore, return mineral, and auxiliary raw materials.
  • the first blended raw material does not include floor covering ore.
  • the first blended raw material may contain blended coal.
  • the surface-coated carbon material is a raw material (hereinafter referred to as a second blended raw material) used for the production of the surface-coated carbon material, that is, a carbon material, a lime-based raw material, and a powder using coarse carbon material as core particles.
  • a second blended raw material used for the production of the surface-coated carbon material, that is, a carbon material, a lime-based raw material, and a powder using coarse carbon material as core particles.
  • a mixing granulator such as a drum mixer or a centrifugal granulator can be used for mixing and granulating the carbonaceous material with the iron powder ore and the lime-based raw material.
  • covered with the lime-type raw material and fine iron ore is formed.
  • a binder organic binders such as CMC (carboxymethylcellulose) and gum arabic and inorganic binders such as water glass can be used. Since a coating layer that adheres tightly to the carbonaceous material surface is formed by the addition of the binder, the carbonaceous material surface is coated during the conveyance process until mixing with the first raw material and charging the raw material into the sintering machine.
  • the surface-coated carbon material may be produced by mixing and granulating a carbon material and a lime-based material as the second blending material.
  • the coating layer of the surface-coated carbon material is composed of only a lime-based raw material.
  • the amount of the surface-coated carbon material in the carbon material (mixed coal) used by blending (mixing) in the production of sintered ore is not particularly limited, but it is necessary to include the surface-coated carbon material in the blended coal. That is, it is necessary that a part of the blended coal is a surface-coated carbon material. In particular, in order to more stably reduce NOx generated during sintering, it is desirable that the blended coal includes a surface-coated carbon material of 10% by mass or more and 100% by mass or less. In order to reduce the difference in combustion time for each carbon material type as much as possible and perform combustion in the sintering machine constantly in a high temperature range, the amount of the surface coating carbon material relative to the total amount of the blended coal is 50% by mass or more.
  • the amount of blended coal is preferably 14% by mass or less with respect to the auxiliary material).
  • the air permeability of the sintered raw material packed layer can be sufficiently ensured.
  • the amount of blended coal with respect to iron ore and auxiliary materials auxiliary materials excluding lime-based raw materials used for surface-coated carbon materials
  • the amount of blended coal with respect to iron ore and auxiliary materials is not particularly limited, but the amount of heat required for the sintering reaction of the sintered raw materials May be 1% by mass or more.
  • the timing for adding and mixing the surface-coated carbon material to the first blended raw material is not particularly limited. However, after mixing and granulating the first blended raw material, it is desirable to add and mix the surface-coated carbonaceous material into the first blended raw material (addition after granulation). By adding and mixing the surface-coated carbonaceous material to the first blended raw material at such timing, it is possible to suppress the coating on the carbonaceous material surface from collapsing or peeling off.
  • the first blended raw material may be composed of blended coal other than iron ore, return ore, auxiliary material, and surface-coated carbon material, or may be composed of iron ore, return ore, and auxiliary material.
  • the surface-coated carbonaceous material is added to the first blended raw material (added before granulation), so that the coating of the surface-coated carbonaceous material does not peel off.
  • the first compounding raw material and the surface-coated carbon material may be mixed and granulated.
  • the first blended raw material may be composed of iron ore, return mineral, auxiliary raw material, and blended coal.
  • the addition of the surface-coated carbon material after granulation can suppress the disintegration and peeling of the coating, so the oxygen blocking action in the air in the low temperature region and the ash melting effect in the high temperature region And the amount of NOx can be greatly suppressed.
  • the carbon material mixing time with respect to the total mixing granulation time of the sintering raw material (the total of the mixing granulation time of only the first compounding material and the addition and mixing time of the surface coating carbon material to the first compounding material)
  • the input time defined by the ratio of (addition and mixing time of the surface-coated carbonaceous material to the first blended raw material) is preferably 0.5 (half) or more, and particularly preferably 0.8 or more. .
  • a surface covering carbon material when mixing and granulating a sintering raw material with one apparatus, a surface covering carbon material can be added and mixed in the apparatus.
  • the surface-coated carbonaceous material when mixing and granulating a sintering raw material with a plurality of apparatuses, the surface-coated carbonaceous material may be added and mixed in an apparatus whose input time has reached a predetermined value (for example, 0.5 or more). it can.
  • the carbon material surface-coated carbon material of the present embodiment it is necessary to cover the carbon material surface with a coating material in a ratio of more than 2% by mass and less than 50% by mass with respect to the carbon material (amount of the coating material with respect to the carbon material). .
  • the mass% of the coating with respect to the carbon material is 2 mass% or less, it becomes difficult to form a sufficient coating layer surrounding the entire surface of the carbon material, and a part of the carbon material surface is exposed, The effect of reducing NOx by blocking oxygen in the atmosphere cannot be obtained.
  • the mass% of the coating with respect to the carbon material is 50 mass% or more, the rate at which calcium ferrite is generated from the lime-based raw material in the high temperature range is decreased, and the combustion efficiency of the carbon material is decreased and the sintering machine. Productivity is reduced.
  • the mass% of the coating with respect to the carbonaceous material is preferably 3 mass% or more, more preferably 5 mass% or more, and 10 mass% or more. It is particularly desirable to be. In order to further increase the combustion efficiency of the carbonaceous material, it is desirable that the mass% of the coating with respect to the carbonaceous material is 40 mass% or less.
  • the layer thickness of the covering layer is 5 ⁇ m or more and 500 ⁇ m or less on the surface of the carbon material of 0.25 mm or more among the carbon materials forming the surface covering carbon material.
  • the layer thickness of the coating layer means an average layer thickness of the coating layer on the carbonaceous material surface of 0.25 mm or more.
  • the layer thickness of the coating layer is 5 ⁇ m or more and 500 ⁇ m or less for each surface-coated carbon material.
  • the thickness of five or more locations in the coating layer of each surface-coated carbon material is measured, and by calculating the average of these layer thicknesses, The layer thickness can be determined.
  • the layer thickness of the coating layer is 5 ⁇ m or more, it is possible to suppress the peeling of the coating layer in the mixing step with the above-mentioned first compounding raw material (iron ore, returning mineral, etc.) or the subsequent handling step. It is possible to sufficiently ensure the NOx suppression effect of the coating layer on the carbonaceous material surface. Further, if the layer thickness of the coating layer is 500 ⁇ m or less, calcium ferrite can be quickly generated from the lime-based raw material in the high temperature range, and the carbonaceous material can be burned efficiently in the high temperature range, and the sintering machine It is possible to sufficiently secure or improve the productivity.
  • the coating containing 36% by mass or more of Ca derived from the lime-based raw material so that the mass% of the coating with respect to the carbon material is more than 2% by mass and less than 50% by mass.
  • the surface of the carbon material is coated to prepare a surface-coated carbon material; this surface-coated carbon material is burned in a sintering machine as a sintered fuel.
  • the surface covering carbon material is included in the blended coal. That is, a surface-coated carbon material is used as the blended coal. Further, the blended coal is mixed with a blended raw material including iron ore, return mineral, and auxiliary raw materials before being charged into the sintering machine.
  • the combustion of the carbon material can be controlled, the generation of NOx is suppressed, and the productivity of the sintering machine is sufficiently secured. Or can be improved.
  • Example 1 An experiment was conducted to investigate the influence of the coating amount of the surface-coated coke and the Ca concentration in the coating layer on the amount of NOx produced.
  • a schematic diagram of the sintering pot test apparatus used in this experiment is shown in FIG.
  • the sintering pot test apparatus includes an ignition furnace 1, a sintering pot 2, an air box 3, a blower 4, and an analyzer 5.
  • the sintering raw material containing the surface-coated carbon material is charged into the sintering pot 2 and ignited in the ignition furnace 1 to heat the sintering raw material.
  • the blower 4 is started to exhaust the exhaust gas generated in the sintering pan 2 through the wind box 3, and the exhaust gas is analyzed by the analyzer 5.
  • the sintering pan 2 had a diameter of 300 mm and a height of 600 mm, and analyzed CO, CO 2 , O 2 , NOx, and SOx in the exhaust gas. Water 7.5% by mass was externally added to the powdered iron ore (iron ore), the auxiliary material, and the carbonaceous material, and these materials were mixed and granulated for 5 minutes using a drum mixer having a diameter of 1,000 mm.
  • FIG. 4 shows the relationship between the coating amount and the Ca concentration in the coating layer, and the NOx conversion rate ( ⁇ NO).
  • ⁇ NO NOx conversion rate
  • ⁇ NO 100 ⁇ NOx / ((CO + CO 2 ) ⁇ N CAKE / (C LPG + C CAKE + C LS )) / 10000 (1)
  • ⁇ NO NOx conversion (mol%)
  • NOx NOx in the exhaust gas (ppm)
  • CO CO in the exhaust gas (mol%)
  • CO 2 CO in the exhaust gas (mol%)
  • N COKE in coke N (mol)
  • C LPG C (mol) in ignition gas
  • C CAKE C (mol) in coke
  • C LS C (mol) in limestone.
  • Example 2 In order to investigate the effect of the layer thickness of the surface-coated carbon material on the NOx reduction effect, the same sintering pot test as in Example 1 was performed. Only calcium hydroxide was used for the coating of the surface-coated coke.
  • FIG. 5A and FIG. 5B show micrographs of surface-coated coke having different coating layer thicknesses used in the sintering pot test.
  • FIG. 6 shows the relationship between the layer thickness of the coating layer (covering layer thickness) and the NOx conversion rate. As shown in FIG. 6, when a surface-coated coke having a coating layer having a layer thickness of 500 ⁇ m or less as shown in FIG.
  • the surface having a coating layer having a layer thickness of more than 500 ⁇ m as shown in FIG. 5B Compared to the case of using coated coke, the NOx reduction effect (NOx conversion rate) was improved. Therefore, it turns out that it is desirable to adjust the layer thickness of a coating to 500 micrometers or less.
  • Example 3 In order to investigate the effect of the type of lime-based raw material on the coatability (adhesion) of the coating layer to coke, surface coating coke using only calcium carbonate as the coating and using only calcium hydroxide as the coating The production test of the surface-coated coke was performed. The mass% of the coating with respect to the coke before mixing a carbon material and each coating was adjusted to 15 mass%. In FIG. 7, the adhesion ratio after drying of the raw material of a coating to the coke surface at the time of using each coating is shown. The adhesion ratio of calcium carbonate to the coke surface was about 20% by mass. On the other hand, the adhesion ratio of calcium hydroxide to the coke surface was more than 80% by mass. Thus, when manufacturing surface-coated coke, it is thought that the binder function of calcium hydroxide can be utilized effectively and a large NOx suppression effect can be obtained.
  • Example 4 In order to investigate the influence of the charging time (charging position) of the surface-coated coke on the amount of NOx produced, a sintering pot test was conducted. As described above, the charging time is the ratio of the carbonaceous material mixing time to the total mixed granulation time of the sintered raw material. In addition, the sintering pot test apparatus and the test method are the same as that of the said Example 1.
  • FIG. 8 shows the relationship between the surface coating coke charging time and the NOx conversion rate. The amount of NOx produced (NOx conversion rate) could be significantly reduced under conditions where the surface coating coke charging time was 0.5 or more, particularly 0.8 or more. In this case, it is considered that the sintered raw material charged into the sintering pan could be prepared while suppressing the coating from collapsing or the coating from peeling off from the coke surface.
  • Example 5 In order to investigate the influence of the amount of surface-coated coke in the blended coal and the time of surface-coated coke on the amount of NOx produced, a sintering pot test was conducted.
  • the sintering pot test apparatus and test method are the same as those in Example 1, except that only calcium hydroxide is used for the coating, the Ca concentration in the coating layer is about 54% by mass, and the coating for coke. The mass% of was adjusted to 15 mass%.
  • FIG. 9 shows the relationship between the amount of surface-coated coke in the blended coal, the time for charging the surface-coated coke, and the NOx conversion rate.
  • the amount of NOx produced could be suppressed by increasing the blending ratio of the surface-coated coke to the entire coke and increasing the charging time. As shown in FIG. 9, it can be seen that the NOx suppression effect is further increased by blending 50 mass% or more of the surface coating coke in the blended coal and controlling the charging time to 0.5 or more.
  • a sintering pot test was conducted.
  • the sintering pot test apparatus and test method are the same as in Example 1 above, but when only calcium hydroxide was used in the coating, the mass% of the coating relative to coke was adjusted to 15 mass%, When calcium hydroxide and pyrbara blended powdered iron ore were used for the coating, the mass% of the coating relative to coke was adjusted to 30% by mass.
  • the Ca concentration in the coating layer was about 54% by mass.
  • the Ca concentration in the coating layer was about 36% by mass.
  • Example 6 In order to confirm the NOx reduction effect of the surface-coated coke, an actual machine operation test for 5 days was performed twice in a large 660 m 2 sintering machine. Table 3 shows the particle size distribution of the coke (coke a to c and coke A to C) used for the actual machine operation test.
  • the surface of the coke was coated with calcium hydroxide in an amount of about 14% by mass of the amount of coke (coke for surface-coated coke) to produce a surface-coated coke.
  • the cokes a to c are ordinary cokes having no surface coating.
  • the coke a (base) was adjusted so that the proportion of particles of less than 0.5 mm in the particle size distribution was more than 20% by mass and the proportion of particles of 0.5 mm or more and 3 mm or less was less than 40%.
  • the coke A (surface-coated coke A) is coke in which the surface of the coke a is coated with calcium hydroxide.
  • the coke b is coke adjusted so that the ratio of particles having a particle size distribution of less than 0.5 mm exceeds 20% by mass and the ratio of particles having a particle size of 0.5 mm to 3 mm is 40% by mass or more.
  • the coke B (surface-coated coke B) is coke in which the surface of the coke b is coated with calcium hydroxide.
  • the coke c is coke adjusted so that the proportion of particles having a particle size distribution of less than 0.5 mm is 11% by mass or less.
  • the coke C (surface-coated coke C) is coke in which the surface of the coke c is coated with calcium hydroxide.
  • FIG. 11 shows a schematic diagram of the process of (1) addition before granulation.
  • FIG. 12 shows a schematic diagram of the process of (2) post-granulation addition. 11 and 12, coke and calcium hydroxide are cut out from a coke tank 11 and a calcium hydroxide tank (lime-based raw material tank) 12, and put into a granulator 13 to produce surface-coated coke.
  • the granulated surface-coated coke is taken out from the surface-coated coke tank 19, and together with the raw materials (ores, auxiliary raw materials, return minerals, etc.) cut out from the raw material tank 14, the primary mixer 15 and the secondary mixer 16 are used. Mix and granulate sequentially. In this case, the surface-coated coke is added before mixing and granulating simultaneously with other raw materials.
  • the surface-coated coke taken out from the granulator 13 is further granulated by the pan pelletizer 18 and then mixed by the primary mixer 15 and the secondary mixer 16 in the latter half of the secondary mixer 16. The surface-coated coke is added to and mixed with other granulated raw materials.
  • FIGS. 13 shows an EPMA analysis result when normal coke is added to the blended raw material before the primary mixer (primary drum mixer).
  • FIG. 14 shows an EPMA analysis result when the surface-coated coke is added to the blended raw material before the primary drum mixer. It was observed that there were particles in which the surface coating layer (calcium hydroxide layer) of the surface coating coke was broken and peeled.
  • FIG. 15 is an EPMA analysis result when surface-coated coke is added to other sintering raw materials in the second half of the secondary drum mixer. In this case, it was observed that a layer of a coating (calcium hydroxide) having a layer thickness of 5 to 500 ⁇ m was secured on the coke surface.
  • a coating calcium hydroxide
  • the test results of the actual machine operation test are shown in FIG.
  • NOx in the exhaust gas is 25 ppm compared to the base period of actual machine operation using coke a (but added before granulation). Declined.
  • NOx in the exhaust gas decreased by 30 ppm as compared with the base period.
  • the coke b used for the surface-coated coke B has a larger mass% of particles (class) of 0.5 mm or more and 3 mm or less than the coke a used for the surface-coated coke A.
  • the amount of NOx produced is lower than when the surface-coated coke A is used. Furthermore, in the implementation period of the actual machine operation using the surface-coated coke C (but added after granulation), NOx in the exhaust gas decreased by 42 ppm compared to the base period.
  • the coke c used for the surface-coated coke C has a smaller mass% of particles (class) of less than 0.5 mm than the coke a used for the surface-coated coke A. Therefore, it is considered that when the surface-coated coke C is used, the amount of NOx produced is lower than when the surface-coated coke A is used.
  • a method for producing a sintered ore that can suppress the generation of NOx by controlling the combustion of carbonaceous materials and sufficiently ensure or improve the productivity of a sintering machine.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Manufacture And Refinement Of Metals (AREA)
PCT/JP2011/059245 2010-04-14 2011-04-14 焼結鉱の製造方法 WO2011129388A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR112012026123-1A BR112012026123B1 (pt) 2010-04-14 2011-04-14 Método de produzir sínter
CN201180018529.0A CN102844449B (zh) 2010-04-14 2011-04-14 烧结矿的制造方法
KR1020127026621A KR101311575B1 (ko) 2010-04-14 2011-04-14 소결광의 제조 방법
JP2011536636A JP4870247B2 (ja) 2010-04-14 2011-04-14 焼結鉱の製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-093334 2010-04-14
JP2010093334 2010-04-14

Publications (1)

Publication Number Publication Date
WO2011129388A1 true WO2011129388A1 (ja) 2011-10-20

Family

ID=44798757

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/059245 WO2011129388A1 (ja) 2010-04-14 2011-04-14 焼結鉱の製造方法

Country Status (5)

Country Link
JP (1) JP4870247B2 (ko)
KR (1) KR101311575B1 (ko)
CN (1) CN102844449B (ko)
BR (1) BR112012026123B1 (ko)
WO (1) WO2011129388A1 (ko)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012036464A (ja) * 2010-08-09 2012-02-23 Nippon Steel Corp 焼結鉱の製造方法
JP2012219283A (ja) * 2011-04-04 2012-11-12 Nippon Steel Corp 焼結鉱の製造方法
JP2013095941A (ja) * 2011-10-28 2013-05-20 Nippon Steel & Sumitomo Metal Corp 焼結鉱製造用の改質炭材の製造方法
JP2019112704A (ja) * 2017-12-26 2019-07-11 Ｊｆｅスチール株式会社 炭材内装粒子の製造方法および炭材内装焼結鉱の製造方法
JP2020015929A (ja) * 2018-07-23 2020-01-30 日本製鉄株式会社 焼結鉱の製造方法
JP2020066770A (ja) * 2018-10-24 2020-04-30 日本製鉄株式会社 焼結鉱の製造方法
JP2020158849A (ja) * 2019-03-27 2020-10-01 株式会社神戸製鋼所 焼結での炭材の燃焼促進方法

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102110643B1 (ko) * 2013-07-10 2020-05-13 제이에프이 스틸 가부시키가이샤 소결광 제조용 탄재 내장 조립 입자와 그 제조 방법
CN103331164A (zh) * 2013-07-24 2013-10-02 武汉科技大学 用于烧结烟气nh3-scr脱硝的铁基催化剂及其制备方法
CN106984319B (zh) * 2017-05-26 2019-08-30 武汉科技大学 一种用于同时脱除烟气中氮氧化物和有机污染物的铁基复合催化剂及其制备方法
KR102177527B1 (ko) * 2018-08-02 2020-11-11 주식회사 포스코 소결용 결합재의 사전 처리방법, 소결용 결합재의 사전 처리장치 및 소결광 제조방법
CN109233935A (zh) * 2018-09-30 2019-01-18 安徽工业大学 一种铁矿烧结烟气多种污染物的联合减排装置及其使用方法
CN109135861A (zh) * 2018-10-08 2019-01-04 宁波大学 一种铁矿石烧结用生物质炭包覆燃料的制备方法
CN109468455A (zh) * 2018-12-26 2019-03-15 中天钢铁集团有限公司 一种烧结过程NOx减排方法和设备
CN114657001B (zh) * 2022-03-30 2023-06-20 鞍钢股份有限公司 一种烧结用复合燃料的制造方法
CN116282033B (zh) * 2023-04-11 2024-06-21 昆明理工大学 一种工业硅用蜂窝状还原球团制备方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5098402A (ko) * 1973-12-31 1975-08-05
JPS5457406A (en) * 1977-10-17 1979-05-09 Sumitomo Metal Ind Ltd Compounding method for raw materials to be sintered
JPH02232322A (ja) * 1989-03-02 1990-09-14 Sumitomo Metal Ind Ltd 高炉装入物およびその製造方法
JP2001271121A (ja) * 2000-03-28 2001-10-02 Nkk Corp 高炉用焼結鉱の製造方法
JP2006009156A (ja) * 2005-08-08 2006-01-12 Jfe Steel Kk 焼結鉱および高炉操業方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT395828B (de) * 1991-06-28 1993-03-25 Voest Alpine Stahl Donawitz Verfahren zur verringerung von schadstoffemissionen bei sinterprozessen
KR100321621B1 (ko) * 1997-12-27 2002-05-13 이구택 질소산화물및황산화물을저감할수있는소결광제조방법
JP2001262241A (ja) 2000-03-15 2001-09-26 Nippon Steel Corp 含炭焼結鉱の製造方法
CN1880488A (zh) * 2000-05-29 2006-12-20 杰富意钢铁株式会社 烧结用模拟粒子原料及其制造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5098402A (ko) * 1973-12-31 1975-08-05
JPS5457406A (en) * 1977-10-17 1979-05-09 Sumitomo Metal Ind Ltd Compounding method for raw materials to be sintered
JPH02232322A (ja) * 1989-03-02 1990-09-14 Sumitomo Metal Ind Ltd 高炉装入物およびその製造方法
JP2001271121A (ja) * 2000-03-28 2001-10-02 Nkk Corp 高炉用焼結鉱の製造方法
JP2006009156A (ja) * 2005-08-08 2006-01-12 Jfe Steel Kk 焼結鉱および高炉操業方法

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012036464A (ja) * 2010-08-09 2012-02-23 Nippon Steel Corp 焼結鉱の製造方法
JP2012219283A (ja) * 2011-04-04 2012-11-12 Nippon Steel Corp 焼結鉱の製造方法
JP2013095941A (ja) * 2011-10-28 2013-05-20 Nippon Steel & Sumitomo Metal Corp 焼結鉱製造用の改質炭材の製造方法
JP2019112704A (ja) * 2017-12-26 2019-07-11 Ｊｆｅスチール株式会社 炭材内装粒子の製造方法および炭材内装焼結鉱の製造方法
JP2020015929A (ja) * 2018-07-23 2020-01-30 日本製鉄株式会社 焼結鉱の製造方法
JP7073959B2 (ja) 2018-07-23 2022-05-24 日本製鉄株式会社 焼結鉱の製造方法
JP2020066770A (ja) * 2018-10-24 2020-04-30 日本製鉄株式会社 焼結鉱の製造方法
JP7187971B2 (ja) 2018-10-24 2022-12-13 日本製鉄株式会社 焼結鉱の製造方法
JP2020158849A (ja) * 2019-03-27 2020-10-01 株式会社神戸製鋼所 焼結での炭材の燃焼促進方法
JP7180044B2 (ja) 2019-03-27 2022-11-30 株式会社神戸製鋼所 焼結での炭材の燃焼促進方法

Also Published As

Publication number Publication date
BR112012026123B1 (pt) 2018-04-17
CN102844449B (zh) 2014-06-04
KR101311575B1 (ko) 2013-09-26
JPWO2011129388A1 (ja) 2013-07-18
KR20120123604A (ko) 2012-11-08
BR112012026123A2 (pt) 2016-06-28
CN102844449A (zh) 2012-12-26
JP4870247B2 (ja) 2012-02-08

Similar Documents

Publication Publication Date Title
JP4870247B2 (ja) 焼結鉱の製造方法
KR101573002B1 (ko) 소결 배가스 중의 황산화물 제거용 조성물 및 소결 배가스 중의 황산화물 제거 방법
JP5810836B2 (ja) 焼結鉱製造用の改質炭材の製造方法
JP5423611B2 (ja) 焼結鉱の製造方法
JP5817629B2 (ja) 微粉造粒炭材を用いた焼結鉱の製造方法
JP2012207256A (ja) 炭材の改質処理設備
JP5703913B2 (ja) 焼結鉱の製造方法
JP5621653B2 (ja) 焼結鉱製造用の改質炭材及び改質炭材を用いた燒結鉱の製造方法。
CN110527826B (zh) 一种烧结过程抑制钙钛矿生成的烧结方法
JP2012255189A (ja) 炭材の改質処理設備
JP2005290456A (ja) 焼結用高燃焼性石炭およびその製造方法並びにその石炭を用いた焼結鉱の製造方法
JP5510361B2 (ja) 焼結鉱の製造方法
JP5598439B2 (ja) 焼結鉱の製造方法
JP6167852B2 (ja) 焼結鉱の製造方法
JP5747675B2 (ja) 炭材の改質処理設備
JP7187971B2 (ja) 焼結鉱の製造方法
JP4589571B2 (ja) 焼結鉱の製造方法
JP2012092384A (ja) 焼結鉱の製造方法
JP5733075B2 (ja) 焼結鉱の製造方法
WO2024116777A1 (ja) 焼結鉱の製造方法
JP2005042202A (ja) 廃活性炭処理方法及び装置
JP3714140B2 (ja) 廃活性炭処理方法及び装置
JP6885164B2 (ja) 焼結鉱の製造方法
JP2003277839A (ja) 溶鉄精錬用カルシウムフェライトの製造方法
JP2009114485A (ja) 焼結鉱の製造方法

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 201180018529.0

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 2011536636

Country of ref document: JP

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11768909

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20127026621

Country of ref document: KR

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 8834/DELNP/2012

Country of ref document: IN

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11768909

Country of ref document: EP

Kind code of ref document: A1

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112012026123

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112012026123

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20121011