WO2010064717A1 - Procédé de fabrication d’un minerai fritté - Google Patents

Procédé de fabrication d’un minerai fritté Download PDF

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Publication number
WO2010064717A1
WO2010064717A1 PCT/JP2009/070440 JP2009070440W WO2010064717A1 WO 2010064717 A1 WO2010064717 A1 WO 2010064717A1 JP 2009070440 W JP2009070440 W JP 2009070440W WO 2010064717 A1 WO2010064717 A1 WO 2010064717A1
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Prior art keywords
sintered
gaseous fuel
combustion
charging layer
gas
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PCT/JP2009/070440
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English (en)
Japanese (ja)
Inventor
大山伸幸
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Ｊｆｅスチール株式会社
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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 KR1020117013500A priority Critical patent/KR101353113B1/ko
Priority to CN2009801483459A priority patent/CN102232120B/zh
Priority to BRPI0923299-0A priority patent/BRPI0923299B1/pt
Priority to EP09830482.7A priority patent/EP2365101B1/fr
Priority to AU2009323269A priority patent/AU2009323269B2/en
Publication of WO2010064717A1 publication Critical patent/WO2010064717A1/fr

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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
    • 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
    • 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
    • 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

Definitions

  • the present invention can produce high-strength, high-quality sintered ore at a high yield and at a low cost, and can also reduce the amount of carbon dioxide (CO 2 ) emissions.
  • the present invention relates to a method for producing sintered ore by a kneader.
  • Sinter ore which is the main raw material of the blast furnace ironmaking method, is generally manufactured through a process as shown in FIG.
  • the raw materials for sintered ore are iron ore powder, sintered ore sieving powder, recovered powder generated in steelworks, CaO-containing auxiliary materials such as limestone and dolomite, granulation aids such as quick lime, coke powder and anthracite Yes, these raw materials are cut out from each of the hoppers 1.
  • the cut out raw material is added with an appropriate amount of water by the drum mixers 2 and 3 and the like, mixed and granulated to obtain a sintered raw material which is pseudo particles having an average diameter of 3 to 6 mm.
  • This sintered raw material is then charged onto an endless moving type sintering machine pallet 8 from a surge hopper 4, 5 arranged on the sintering machine via a drum feeder 6 and a cutting chute 7, and baked.
  • the thickness (height) of the charging layer is usually around 400 to 800 mm.
  • the ignition furnace 10 installed above the charging layer 9 ignites the carbon material on the surface of the charging layer, and sucks the atmosphere downward through the wind box 11 disposed immediately below the pallet 8. By doing so, the carbonaceous material in the charging layer is sequentially burned, and the sintered raw material is melted by the combustion heat generated at this time to obtain a sintered cake.
  • the sintered cake thus obtained is then crushed and sized, and an agglomerate of about 5 mm or more is recovered as a product sintered ore.
  • the carbonaceous material in the charging layer ignited by the ignition furnace 10 is continuously burned by the air sucked from the upper layer to the lower layer by the windbox, and has a wide combustion.
  • -A melting zone (hereinafter, simply referred to as “combustion zone”) is formed. This combustion zone gradually moves from the upper layer to the lower layer of the charging layer as the pallet 8 moves downstream, and after passing through the combustion zone, a sintered cake layer (hereinafter simply referred to as “sintered layer”). Is generated).
  • FIG. 2 shows the inside of the charging layer when the combustion zone moving in the charging layer having a thickness of 600 mm is located approximately 400 mm above the pallet of the charging layer (200 mm below the charging layer surface).
  • the production amount (t / hr) of the sintering machine is generally determined by the sintering production rate (t / hr ⁇ m 2 ) ⁇ sintering machine area (m 2 ). That is, the production amount of the sintering machine depends on the machine width and length of the sintering machine, the thickness of the raw material deposition layer (charge layer thickness), the bulk density of the sintering raw material, the sintering (combustion) time, the yield, etc. Change.
  • Fig. 3 shows the change in temperature and time at a certain point in the charging layer when the sintered ore productivity is high and low, that is, when the pallet moving speed of the sintering machine is fast and slow. It is.
  • the time at which the sintered raw material particles start to melt is maintained at a temperature of 1200 ° C. or higher (hereinafter referred to as “high temperature region holding time”) is t 1 when productivity is low, and t 2 when productivity is high.
  • the high temperature zone holding time t 2 is shorter than the t 1 when the productivity is low. If the high temperature region holding time is shortened, firing is likely to be insufficient, the cold strength of the sintered ore is lowered, and the yield is lowered. Therefore, in order to produce high-strength sintered ore in a short time and with high yield and good productivity, some measures should be taken to extend the “high temperature range holding time” and the strength of the sintered cake, It is necessary to increase the cold strength. In general, SI (shutter index) and TI (tumbler index) are used as indices representing the cold strength of sintered ore. FIG.
  • FIG. 4 shows that the carbon material in the surface of the charged layer ignited by the ignition furnace continues to burn by the sucked air to form a combustion zone, which moves sequentially from the upper layer to the lower layer of the charged layer, It is the figure which showed typically the process in which is formed.
  • FIG. 5A shows the temperature distribution when the combustion zone is present in each of the upper layer portion, middle layer portion, and lower layer portion of the charging layer shown in the thick frame shown in FIG. It is shown schematically. The strength of sintered ore is affected by the time of holding at a temperature of 1200 ° C. or higher, more precisely the product of temperature and time held at a temperature of 1200 ° C. or higher. Becomes higher.
  • the middle layer portion and the lower layer portion of the charging layer are preheated by being transported together with the air by which the combustion heat generated by the combustion of the carbon material in the upper layer of the charging layer is sucked. Therefore, while the middle layer and lower layer of the charging layer are kept at a high temperature for a long time, the upper layer of the charging layer lacks the heat of combustion, and the combustion melting reaction (sintering) required for sintering. The chemical reaction) tends to be insufficient. As a result, as shown in FIG. 5B, the yield distribution of the sintered ore in the cross section in the width direction of the sintering machine in the charging layer becomes lower in the upper layer portion of the charging layer.
  • Japanese Patent Laid-Open No. 48-18102 discloses a technique for injecting gaseous fuel onto a charged layer after ignition of the charged layer.
  • Japanese Patent Publication No. 46-27126 discloses a technique for igniting the charged layer, Japanese Patent Application Laid-Open No.
  • 55-18585 discloses a technique for adding a combustible gas into the air sucked into the charging layer.
  • Japanese Patent Application Laid-Open No. 5-31257 discloses a low-melting solvent, a carbonaceous material, A technique has been proposed in which a combustible gas is simultaneously blown at a position immediately after the ignition furnace.
  • these techniques use high-concentration gaseous fuel, and do not reduce the amount of carbonaceous material when the fuel gas is blown, so that the highest temperature reached during sintering in the charge layer exceeds 1380 ° C.
  • gaseous fuel diluted to a predetermined concentration is introduced into the charging layer of the lower suction type sintering machine and burned at a target position in the charging layer. Therefore, by appropriately controlling the maximum temperature reached during combustion of the sintering raw material and the holding time in the high temperature range, the cold ore strength of the sintered ore tends to be low due to insufficient heat, and the sintered ore at the upper part of the charging layer It is possible to increase the strength of the sintered ore in the middle and lower layers of the charging layer.
  • an object of the present invention is to provide a method for producing a sintered ore by supplying gaseous fuel downstream of an ignition furnace of a downward suction type sintering machine, in relation to the gaseous fuel, By optimizing the amount of carbonaceous material contained in the sintering raw material and maximizing the gas fuel supply effect, high strength, high quality sintered ore can be produced at high yield and low cost. And it is in proposing the manufacturing method of the sintered ore which can reduce the discharge
  • the inventors have produced a high strength and high quality sintered ore with a high yield and low cost in a method for producing a sintered ore by supplying diluted gas fuel downstream of the ignition furnace of the downward suction type sintering machine.
  • diligent research has been conducted to optimize the relationship between the amount of diluted gas fuel supplied and the amount of carbonaceous material contained in the sintered raw material. Piled up.
  • the present invention includes a charging step of forming a charging layer by charging a sintered raw material containing fine ore and carbonaceous material on a circulating pallet, and an ignition furnace for the carbonaceous material on the surface of the charging layer.
  • An ignition process that uses and ignites, a gaseous fuel supply process that supplies gaseous fuel to the atmosphere above the charging layer and supplies it as a diluted gaseous fuel below the lower combustion limit concentration, and the above-mentioned dilution in a wind box placed under the pallet Sintering process in which gaseous fuel and air are sucked into the charging layer to burn the carbonaceous material in the charging layer, and the diluted gaseous fuel is burned in the charging layer after burning the carbonaceous material and sintered.
  • the amount of carbonaceous material in the sintered raw material is reduced as compared with the case where no gaseous fuel is supplied.
  • A is a replacement rate defined by combustion heat of supplied gaseous fuel
  • B combustion heat corresponding to the reduced amount of carbonaceous material, and is in the range of 1 to 15.
  • the method for producing a sintered ore according to the present invention is characterized in that the substitution rate is in the range of 1.5 to 10, or 2 to 6.
  • combustion / melting in the sintering process is achieved by reducing the amount of carbonaceous material contained in the sintering raw material according to the supply amount of the diluted gas fuel supplied downstream of the ignition furnace of the sintering machine.
  • the temperature of the belt can be maintained in the range of 1200 to 1380 ° C for a long time without the highest temperature exceeding 1380 ° C, so high strength sintered ore can be produced with high yield and high productivity. It becomes possible to manufacture stably while ensuring.
  • the amount of carbonaceous material corresponding to the combustion heat of the gaseous fuel to be supplied can be reduced, so that the carbonaceous material cost can be reduced and the amount of carbon dioxide generated in the sintering process can be greatly reduced. Can be reduced.
  • FIG. 1 is a diagram illustrating a manufacturing process of sintered ore.
  • FIG. 2 is a diagram for explaining the pressure loss and temperature distribution in the charging layer during sintering.
  • FIG. 3 is a diagram comparing the time transition of the temperature in the charging layer when the sintered ore productivity is high and low.
  • FIG. 4 is a diagram schematically illustrating the sintering progress process of the charging layer.
  • FIG. 5 is a diagram for explaining the temperature distribution during sintering in the upper layer portion, middle layer portion, and lower layer portion of the charge layer, and the yield distribution of sintered ore in the cross section in the charge layer width direction.
  • FIG. 6 is a diagram for explaining a test apparatus used for comparison of dilution gas fuel supply methods.
  • FIG. 1 is a diagram illustrating a manufacturing process of sintered ore.
  • FIG. 2 is a diagram for explaining the pressure loss and temperature distribution in the charging layer during sintering.
  • FIG. 3 is a diagram comparing the time transition of the
  • FIG. 7 is a diagram for explaining an example of a gaseous fuel supply apparatus according to the present invention.
  • FIG. 8 is a diagram for explaining another example of the gaseous fuel supply device according to the present invention.
  • FIG. 9 is a diagram for explaining a sintering reaction.
  • FIG. 10 is a state diagram for explaining a process in which skeletal secondary hematite is generated.
  • FIG. 11 is a diagram for explaining the effect of supplying gaseous fuel on the temperature distribution in the charging layer.
  • FIG. 12 is a diagram for explaining the influence of the supply condition concentration and supply position of the diluted gas fuel on the temperature distribution in the charging layer.
  • FIG. 13 is a graph showing the relationship between the substitution rate B / A, which is the ratio between the combustion heat A of the gaseous fuel and the combustion heat B corresponding to the amount of reduced carbon material, and the quality of the sintered ore in the pan test.
  • FIG. 14 is a diagram illustrating the configuration of the sintering machine used in the sintering experiment of the example.
  • FIG. 15 is a graph showing the relationship between the substitution rate B / A between the combustion heat A of the gaseous fuel and the combustion heat B corresponding to the reduced amount of carbonaceous material and the quality of the sintered ore in the actual sintering machine.
  • the method for producing a sintered ore according to the present invention includes the charging process, the ignition process, the gaseous fuel supply process, and the sintering process.
  • the above charging step is a step of charging a sintered raw material including fine ore and carbonaceous material on a circulating pallet to form a charging layer
  • the ignition step is charged by an ignition furnace. It is a step of igniting the carbon material on the surface layer.
  • high-concentration gas fuel is discharged from the gas fuel supply device into the atmosphere above the charging layer at a high speed on the downstream side in the pallet moving direction of the ignition furnace, and instantaneously mixed with air.
  • the carbon material in the charging layer is combusted by the air sucked into the charging layer, the sintered raw material is melted and sintered by the generated combustion heat, and the diluted gas fuel is passed through the combustion zone. Is a step of generating a sintered cake by burning at a predetermined position and further promoting melting and sintering.
  • a high-concentration gaseous fuel introduced into the charging layer is discharged into the atmosphere at a high speed above the charging layer and mixed with the surrounding air in a short time,
  • the gaseous fuel is diluted to a concentration below the lower combustion limit concentration, and then the diluted gaseous fuel is introduced into the charging layer.
  • the reason for diluting before introducing into the charging layer is as follows. An experimental apparatus was fabricated in which a sintered cake having an inner diameter of 300 mm ⁇ and a height of 400 mm was filled with a sintered cake, and air could be sucked through the sintered cake below the sintered cake. Next, as shown in FIG.
  • a nozzle is embedded at a position 90 mm deep from the top of the central portion of the sintered cake, and 100% concentration of methane gas in an amount of 1 vol% with respect to the sucked air.
  • the distribution of methane gas concentration in the circumferential direction and depth direction in the sintered cake was measured, and the results are shown in Table 1.
  • FIG. 6 (b) using the same nozzle, from the position 350 mm above the sintered cake, the same amount of methane gas as above is supplied to the atmosphere for dilution, and the same as above.
  • the distribution of methane gas concentration in the sintered cake was measured, and the results are shown in Table 2.
  • the gaseous fuel is supplied to the atmosphere above the sintered cake and diluted uniformly before being introduced into the charging layer.
  • a gaseous fuel such as city gas, LNG, or C gas is discharged into the atmosphere at a high concentration and mixed with the surrounding air.
  • Directly-injecting method that introduces into the charging layer after diluting to a predetermined concentration
  • premixing blowing method that supplies air and gaseous fuel mixed in advance and diluted to a predetermined concentration from above the charging layer
  • Table 3 evaluates the pros and cons of both types.
  • the direct injection method it is easy to prevent backfire if the gaseous fuel is discharged at a speed higher than the turbulent combustion speed, but concentration unevenness is likely to occur when the gaseous fuel is mixed with the surrounding atmosphere and diluted.
  • concentration unevenness is likely to occur when the gaseous fuel is mixed with the surrounding atmosphere and diluted.
  • the possibility of abnormal combustion is high compared to the premixed blowing method.
  • the direct injection method of city gas (LNG) is the best.
  • a plurality of gaseous fuel supply pipes are arranged along the width direction of the pallet, and slits or openings for discharging gaseous fuel are provided in the pipes.
  • a gaseous fuel supply means provided with a nozzle, or, as shown in FIG. 8, a plurality of gaseous fuel supply pipes are disposed along the direction of travel of the pallet, and gaseous fuel is supplied to the pipes. It is preferable to have a gaseous fuel supply means that is provided with slits or openings for discharging or has nozzles attached.
  • Table 4 shows the lower limit concentration of combustion, supply concentration, etc. of gaseous fuels (city gas, coke oven gas (C gas), blast furnace gas (B gas)) used in the steel industry. From the viewpoint of preventing explosion and fire (ignition), it is safer that the concentration of the gaseous fuel at the time of feeding into the sintered raw material is lower than the lower combustion limit concentration.
  • the city gas uses natural gas (LNG) mainly composed of methane, and the lower limit concentration of combustion is similar to that of C gas, but since the amount of heat is higher than that of C gas, the supply concentration is reduced. Can be lowered. Therefore, in order to ensure safety, city gas that can lower the supply concentration is superior to C gas.
  • LNG natural gas
  • Table 5 shows the combustion components (hydrogen, CO, methane) contained in the gaseous fuel, the lower and upper combustion concentrations of these components, the laminar flow, the combustion speed during turbulent flow, and the like.
  • the gaseous fuel may be discharged at a high speed at least equal to or higher than the laminar combustion speed, preferably equal to or higher than the turbulent combustion speed.
  • the turbulent combustion speed For example, in the case of city gas mainly composed of methane, there is no fear of backfire if it is discharged at a speed exceeding 3.7 m / s.
  • the gaseous fuel that can be supplied into the charging layer in the present invention in addition to the above-mentioned city gas (LNG), B gas, C gas, CO gas, ethane gas, propane gas, butane gas or a mixed gas thereof can be used. Either can be used. However, when B gas or C gas is used, it is necessary to increase the gas discharge rate and to take CO countermeasures separately. Next, the density
  • the supply of high-concentration combustible gas to the upper part of the charge layer may sometimes lead to explosive combustion, and at least at room temperature, it must be in a state that does not burn even if there is a fire type. Even if it reaches the electrostatic precipitator or the like downstream of the windbox without burning completely in the charging layer, it is necessary that there is no risk of burning due to the discharge of the electrostatic precipitator. Furthermore, due to the consumption of oxygen due to the combustion of diluted gaseous fuel, it is diluted to such an extent that the shortage of oxygen required for the combustion of the total fuel (carbon material + gaseous fuel) contained in the sintering raw material will not be caused.
  • the lower limit concentration of the diluted gas fuel is preferably 1% or more of the lower limit concentration of combustion. This is because if the lower limit concentration of combustion is less than 1%, the calorific value due to combustion is insufficient, and the strength improvement and yield improvement effects of the sintered ore cannot be obtained. From the above, it is preferable that the concentration of the diluted gas fuel supplied to the charging layer in the present invention is in the range of 1 to 75% of the lower combustion limit concentration. In terms of natural gas (LNG), the lower combustion concentration of LNG is 4.8 vol% (see Table 4), so the concentration of diluted gas fuel is preferably in the range of 0.05 to 3.6 vol%. It will be.
  • the maximum reached temperature in the charging layer during sintering does not exceed 1380 ° C.
  • the formation of calcium ferrite depends on the time for which the temperature is maintained at 1200 ° C. or more, more precisely, the product of the temperature and time for which the temperature is maintained in the range of 1200 to 1380 ° C.
  • the present invention secures a heat source necessary for sintering, and further extends the time for maintaining the temperature in the charging layer during sintering in the temperature range of 1200 to 1380 ° C.
  • a sintering method is employed in which gaseous fuel is supplied into the charging layer.
  • FIG. 11B shows the case where the diluted gas fuel was supplied and the case where the diluted gas fuel was not supplied in the sintering test using the transparent quartz test pot.
  • the broken line in the figure is an example when 5 mass% of coke is blended as a carbonaceous material in the sintered raw material, and gaseous fuel is not supplied. When the combustion / melting zone passes the above point, the broken line is shown. It can be seen that the temperature in the layer is maintained at a temperature of 1200 ° C. or more effective for sintering for about 2 minutes.
  • the solid line in the figure shows the amount of carbonaceous material (coke) in the sintering raw material by supplying LNG in an amount equivalent to 0.4 mass% in coke in terms of calorific value. In this example, the mass is set to 4.6 mass% and the total heat amount is constant.
  • the diluted gas fuel supplied into the charging layer burns in the upper layer side of the coke combustion position (combustion zone), that is, in the region where the combustion zone has already passed and the temperature starts to decrease, and that region.
  • combustion zone combustion position
  • the time for maintaining the temperature at 1200 ° C. or more effective for sintering is greatly extended.
  • this extension increases the maximum temperature in the charging layer at the time of passing through the gas combustion / melting zone even though the amount of coke is reduced with the supply of gaseous fuel, and causes a reduction in coke strength. It is realized without raising the temperature to over.
  • FIG. 12 shows the result of the sintering experiment in the sintering experiment shown in FIG.
  • FIG. 12 (a) shows the time position where the coke and the gaseous fuel burn in the charging layer
  • FIG. 12 (b) shows the result of the combustion as shown by ⁇ in FIG. 12 (a).
  • the time transition of the temperature in the position in the charging layer is shown.
  • the curve of level A (thin solid line) shown in FIG. 12B is a temperature change in an example in which 5 mass% of coke is contained as a carbonaceous material in the sintered raw material and no gaseous fuel is supplied. .
  • the curve of level B is an example in which LNG diluted to 0.1 vol% is supplied and coke is reduced to 4.6 mass%.
  • the curve of level D is an example in which LNG diluted to 4.0 vol% is supplied and coke is reduced to 4.6 mass%.
  • the combustion temperature of diluted gas fuel depends on the temperature, The higher the concentration, the lower the combustion temperature.
  • the amount of the carbonaceous material contained in the sintered raw material is 5.0 mass% when there is no gaseous fuel blowing, and 4.8 when there is gaseous fuel blowing. Varying between ⁇ 4.0 mass%, the relationship between the combustion heat of the supplied gaseous fuel and the combustion heat corresponding to the reduced amount of carbon material, and the quality and productivity of the sintered ore was investigated. The results of the pan test are shown together in Table 7. Further, when the combustion heat of the supplied gaseous fuel is defined as A and the combustion heat corresponding to the reduced amount of carbonaceous material is defined as B, the ratio of B to A (B / A) is defined as the replacement ratio. FIG.
  • FIG. 13 shows the relationship between / A, sintered ore quality (shutter strength, reducibility), product yield, and production rate.
  • the shutter strength was measured according to JIS M8711
  • the reducibility was measured according to JIS M8713. From FIG. 13, at least in the case of producing a sintered ore by supplying gaseous fuel, even if the amount of carbonaceous material in the sintering raw material is reduced compared to when no gaseous fuel is supplied, There is no adverse effect on quality characteristics (strength, reducibility) and productivity. On the other hand, quality characteristics and productivity of sintered ore are improved.
  • replacement ratio B / A is 1 or more, that is, gaseous fuel is supplied.
  • FIG. 13 shows that the reduction amount of the carbonaceous material can fully enjoy the effect of the gaseous fuel supply even if the substitution rate B / A is about 5, and the amount of the carbonaceous material is greatly reduced. That is, the amount corresponding to the combustion heat of the gaseous fuel supplied in the gaseous fuel supply process is required to maintain the temperature in the charging layer in the range of 1200 to 1380 ° C. and prevent the formation of amorphous calcium silicate. It was confirmed that the above charcoal materials had to be reduced.
  • the quality of sintered ore can be reduced even if the amount of charcoal corresponding to the combustion heat of the diluted gas fuel to be supplied is reduced, and thus the total combustion heat of the gas fuel and the charcoal is reduced.
  • the diluted gas fuel supplied into the charging layer is higher than the combustion position (combustion zone) of coke, that is, combustion.
  • the temperature in the charging layer when passing through the gas combustion / melting zone causes a reduction in coke strength 1380 It is thought that this is because the time that is maintained at a temperature of 1200 ° C.
  • the amount of the carbon material in the sintered raw material is preferably reduced so that the substitution rate B / A is in the range of 1 to 15, more preferably 1.5 to 10 depending on the gaseous fuel to be supplied.
  • the present invention is in the range of 2-6.
  • the amount of carbon dioxide generated by the combustion of the carbonaceous material can be greatly reduced. Therefore, it can be said that the present invention is an environmentally harmonious technology that is friendly to the global environment.
  • the sample is rotated in a rotating drum and sieved with a 6.3 mm sieve, and the sample mass used for the test and the sample mass of +6.3 mm after the test are obtained. It was calculated from the ratio. Further, the reducibility includes 500 g of sintered ore sample sieved to 19.0 to 22.4 mm according to JIS M8713, containing 900 vol% CO and 70 vol% N 2 at 900 ° C. After reducing with reducing gas for 180 minutes, it was determined by the ratio of the amount of reduced oxygen to the amount of oxygen to be reduced before reduction.
  • FIG. 15 shows the relationship with ore quality (tumbler strength TI, reducible RI). From these results, the strength and reducibility are improved when the substitution rate B / A, which is the ratio between the combustion heat A of the gaseous fuel in the pan test and the combustion heat B corresponding to the amount of reduced carbon material, is in the range of 1-15. It can be seen that the obtained sintered ore is obtained.

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Abstract

L’invention concerne un procédé de fabrication d’un minerai fritté, selon lequel un combustible gazeux est introduit en aval d’un four d’allumage d’un appareil de frittage pour produire un minerai fritté à partir d’une matière première à fritter qui a une teneur en matériau carboné optimisée par rapport au combustible gazeux. Un minerai fritté de grande qualité qui présente une grande résistance est ainsi produit de manière stable, et la génération de CO2 peut être réduite. Le procédé de fabrication d’un minerai fritté comprend : une étape de chargement lors de laquelle une matière première à fritter qui comprend un minerai fin et un matériau carboné est placée sur une palette; une étape d’allumage lors de laquelle le matériau carboné à la surface de la couche de matière première résultante est allumé; une étape d’introduction d’un combustible gazeux lors de laquelle un combustible gazeux est introduit sur la couche de matière première; et une étape de frittage lors de laquelle le combustible gazeux dilué et de l’air sont aspirés, avec une boîte à vent disposée sous la palette, dans la couche de matière première pour brûler le matériau carboné contenu dans la couche de matière première et brûler le combustible gazeux dilué dans la couche de matière première dans laquelle le matériau carboné a brûlé, frittant ainsi le minerai. Dans le procédé, la quantité de matériau carboné contenu dans la matière première à fritter a été réduite par rapport au cas où un combustible gazeux n’est pas introduit. De préférence, la quantité de matériau carboné contenu a été réduite d’au moins une quantité équivalente à la chaleur de combustion du combustible gazeux à introduire lors de l’étape d’introduction d’un combustible gazeux.
PCT/JP2009/070440 2008-12-01 2009-11-30 Procédé de fabrication d’un minerai fritté WO2010064717A1 (fr)

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KR1020117013500A KR101353113B1 (ko) 2008-12-01 2009-11-30 소결광의 제조 방법
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BRPI0923299-0A BRPI0923299B1 (pt) 2008-12-01 2009-11-30 Method for production of sintered ore
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JP5439981B2 (ja) * 2008-12-03 2014-03-12 Ｊｆｅスチール株式会社 焼結鉱の製造方法
JP6037145B2 (ja) 2012-06-13 2016-11-30 Ｊｆｅスチール株式会社 焼結鉱の製造方法
CN103512351B (zh) * 2012-06-20 2015-10-07 鞍钢股份有限公司 一种金属化烧结矿的烧结装置及其生产方法
JP5574062B2 (ja) 2012-07-18 2014-08-20 Ｊｆｅスチール株式会社 焼結機の気体燃料供給装置
EP2876175B1 (fr) * 2012-07-18 2020-10-14 JFE Steel Corporation Procédé de production d'un produit fritté
EP2924132B1 (fr) * 2012-11-20 2020-05-06 JFE Steel Corporation Dispositif d'alimentation en combustible de gaz d'oxygène pour appareil de frittage
CN104342550A (zh) * 2013-07-26 2015-02-11 上海梅山钢铁股份有限公司 焦炉煤气辅助烧结的方法
JP6213734B2 (ja) * 2014-02-24 2017-10-18 Ｊｆｅスチール株式会社 焼結鉱の製造方法
JP6295791B2 (ja) * 2014-04-04 2018-03-20 新日鐵住金株式会社 焼結鉱製造方法、及び、石炭チャー、又は無煙炭若しくは半無煙炭の評価方法
CN110319694A (zh) * 2018-03-31 2019-10-11 高彦 烧结装置及控制方法
CN114058840A (zh) * 2021-10-20 2022-02-18 包头钢铁（集团）有限责任公司 一种使用可燃气体改善烧结矿质量的方法
CN115218669B (zh) * 2021-11-22 2024-06-11 中冶长天国际工程有限责任公司 一种燃气间歇吸入辅助烧结的装置及其方法

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AU2009323269B2 (en) 2013-10-31
BRPI0923299B1 (pt) 2017-10-31
KR20110084321A (ko) 2011-07-21
CN102232120B (zh) 2013-08-07
KR101353113B1 (ko) 2014-01-17
EP2365101B1 (fr) 2018-10-03
BRPI0923299A2 (pt) 2016-01-05
EP2365101A1 (fr) 2011-09-14
CN102232120A (zh) 2011-11-02
BRPI0923299A8 (pt) 2016-09-13
TW201033373A (en) 2010-09-16
JP2010126802A (ja) 2010-06-10
TWI460278B (zh) 2014-11-11
EP2365101A4 (fr) 2016-04-06
AU2009323269A1 (en) 2011-07-07

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