TWI329677B - - Google Patents

Description

1329677 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a sinter of a blast furnace raw material using a suction type belt type lioyd, DL) sintering machine; method, wl/ht - used in the method Sintering machine. And - [Prior Art] _ Sinter, which is the main raw material of the blast furnace-made pig iron method, is generally manufactured through the steps of Figure i. The raw materials are iron powder ore, recycled powder in iron ore, sinter ore sieve powder, limestone, dolomite and other granulation aids such as Ca-containing raw materials, lime, etc., coke powder or smokeless charcoal. CaO-containing raw materials such as limestone and dolomite are hereinafter referred to as r Ca〇-based auxiliary materials. The raw materials are cut from the respective funnels 1 on a conveyor at a specific ratio. The raw material to be cut is mixed with a proper amount of water by a cylindrical mixer 2 or the like, and then granulated to form a sintered raw material having a mean diameter of 3. 〇 mm to 6 〇. The sintered raw material formed is dried in the rotary kiln 3 by φ. The dried sintering raw material is loaded into the endless moving sintering machine trolley 8 from the receiving buckets 4 and 5 disposed on the sintering machine via the drum feeder 6 and the shearing tank 7, forming a so-called sintering bed. Load layer 9. The thickness of the layer (two degrees) is about 400 mm to 800 mm. Thereafter, the carbonaceous material in the packed bed is ignited by means of an ignition furnace 10 disposed above the loading layer 9. The carbon material in the charging layer is sucked to the lower side via a bellows π disposed under the bogie 8, thereby sequentially burning, and the sintered raw material is burned and smelted by the combustion heat generated at this time. Piece. Thereafter, the obtained agglomerate is pulverized and recovered by granulation & into a finished sinter composed of a mass of 5. 〇 mm or more 312 / invention specification (supplement) / 96-01 / 95140218 5 1329677. In the above manufacturing process, first, the surface of the layer is ignited by the ignition furnace. The charcoal charged in the layer is burned by the action of the attracting gas attracted to the lower portion from the top of the packed layer, and the combustion gradually proceeds to the lower layer and travels forward as the trolley 8 moves. At the same time as the progress of the combustion, the moisture of the sintered raw material particles in the charged layer evaporates due to the heat generated by the combustion of the carbon material, but is attracted to the lower side and is concentrated to be wetted under the temperature In the sintering raw materials. When the water concentration is increased to a certain extent or more, since the water fills the flow path of the suction gas (i.e., the gap between the raw material particles), the ventilation resistance increases. Further, the venting resistance is also increased in the molten portion necessary for the sinter reaction. The production of sinter (t/hr) is usually determined by the sintering productivity (t/hr · m2) x sintering machine area (m2). That is, the variation in the amount of production depends on the machine width and length of the sintering machine, the thickness of the raw material accumulation layer (loading layer thickness), the bulk density of the sintered raw material, the sintering (combustion) time, the yield, and the like. In order to increase the production amount of the sintered φ ore, the following method is considered to be effective, that is, to improve the air permeability (pressure loss) of the packed layer to shorten the sintering time; or to increase the cold rolling strength of the sintered block before the crushing to make the good The method of increasing the rate, etc. Figure 2 is a graph showing the distribution of pressure loss and temperature in the packed layer. The temperature profile of Fig. 2 shows the combustion (flame) front line moving in the loading layer, which is about 4 mm on the trolley in the thickness direction of the loading layer. At this time, the pressure loss is distributed in the wet zone of about 6〇%, and the combustion melt is 40%. Figure 3 shows the temperature of the intrusion layer when the sintered ore is produced at low production and low production. ) /96-01/95140218 6 1329677 degrees: layout. The temperature is maintained at the beginning of the melting of the raw material particles 2 〇 (the same period of the rc above the holding period of the dish, expressed as t 低 in low production, expressed in h when the production is important.) In high production, it must be Increasing the speed of the trolley, so the high temperature zone holding time t2 at this time is shorter than the high temperature zone during low production -= holding time t1. Since the time of keeping at high temperature becomes shorter, the firing is not charged. The second 'causes the cold casting strength of the sintered ore. Lowering, causing a decrease in yield. Therefore, in order to increase the production capacity of strontium ore, it is effective to use a certain method to increase the strength of the sintered block, that is, to increase the cold rolling strength of the sintered ore and to maintain the yield. Further, for the sinter cold rolling strength, SI (Shatter Index) and TI (TumMer Index) are used. Figure 4 (a) shows the sintering progress of the loading layer on the sintering machine trolley. Principle, Fig. 400 shows the temperature distribution of the sintering process in the packed layer, and Fig. 4(c) shows the yield distribution of the sintered block. As can be seen from Fig. 4(b), the upper portion of the layer (sintered layer) is harder to rise in temperature than the lower layer portion, and the high temperature region holding time is shortened. Therefore, on the packed layer, the combustion-spinning reaction (sintering reaction) is insufficient, as shown by _ 4 (c), since the strength of the sintered block is lowered, the yield is not improved and the productivity is lowered. The tendency. - Conventionally, a method has been proposed which is useful for maintaining the upper portion of the packed layer at a high temperature. =Special = Kai Zhao 48-Deleted No. 2 bulletin reveals that when the front of the ignition furnace is blown into the dryness of the 'sexual teaching I#, ..., the second is blown into the flammable gas. The material stem, so the formation of more than 1380 temperature in the sintered layer, so can not obtain sufficient cold expansion strength, yield improvement: 312 / invention manual (supplement) / 96-01/95140218 7 1329677 effect. Further, the inflammable gas is blown in the rear side of the ignition furnace for 〇 minute to 2 minutes, and the igniting of the flammable gas causes a high risk of a large fire, and the technique lacking in practicality has not reached the practical level. Further, Japanese Laid-Open Patent Publication No. Sho 55-18585 discloses a technique in which a hood is disposed above the loading layer in order to achieve a high temperature in the charging layer of the sintering raw material, and the hood is passed through the hood. Mixing air with coke oven gas • The gas is blown into the rear of the ignition furnace. The temperature in the sintered layer is such that the temperature exceeds 1350 C, so that the above-described blowing effect is not obtained, and the combustible gas mixture is ignited, which is dangerous to a large fire, and thus has not been put into practical use. Further, Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. In this method, the risk of a large fire is caused by blowing a flammable gas in a state where a flame remains on the surface, and the width of the sintered belt is not high; i is thick enough (about 15 or less), so that the effect cannot be fully generated. . Further advancement - Because there are a large number of low melting point solvents, excessive melting occurs in the upper layer to block the pores of the air flow path. Due to the deterioration of the gas, the productivity is reduced, so the technology has not been used yet. As described above, the conventional techniques proposed so far have not been put into practical use. Therefore, it is urgent to explore the conditions for the economic establishment. In the U-quality adjustment of sinter, it is important to adjust the temperature at which the combustion reaches the temperature and the holding time of the high-temperature region. The quality of the sinter is determined by the same factor. The Japanese patent special opening-- No. 312 / invention specification (supplement V96*01/95140218 is to use the if = no method to make the gaseous fuel burn on the surface of the loading layer.) / The upper part of the sintering step in the first half of the sintering step The second method of this method has the following problems: the gas fuel concentration is high, and thus the amount of the second gas (oxygen) of the hawthorn is insufficient, which may cause the combustion of the coffin (coke) of the sintering raw material to be lowered, thereby failing to achieve the quality of the sintered ore. Japanese Patent Laid-Open No. 55-18585* discloses a square 糸~糸: a flue hood is provided to supply combustion with gas and flammable gas, thereby: a method of serving more 'temperature, however The method also causes insufficient heat. The second method also has the following problem: in the high temperature zone, the coke combustion m _ gas is consumed by the combustion of the flammable gas, so the combustion of the coke is slow, resulting in sintering time. Extend. In the method disclosed in Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The combustion degree is increased, but the aeration property of the combustion air is lowered because the low melting point molten material and the powder are blown together. [Invention] The present invention aims to provide a method for producing sintered ore and a method for realizing palladium. In the sintering machine, the method for producing the sintered ore is a lower suction type, and the material of the junction is not deteriorated, and the high-yield sintered ore is produced at a high yield. The invention provides a method for manufacturing a sintered ore having the following steps: loading step, in a trolley for circulating movement, containing a sintering raw material containing a powder ore and a charcoal 3127 invention specification (supplement)/96-01/95140218 9 1329677 a charging layer containing a carbon material formed on the trolley; an ignition step of igniting the carbon material charged on the surface of the layer in the ignition furnace; a firing step through the bellows disposed under the trolley Attracting air, burning the carbon material in the layer, and generating the agglomerate by using the generated heat of combustion; and the step of burning the fuel in the milk fuel step to supply the gas fuel diluted to the lower limit of the lower combustion concentration The gaseous fuel is combusted in the charging layer. The gas fuel burning step preferably includes an operation of supplying a gaseous fuel diluted to a lower concentration of combustion below the loading layer to cause the gaseous fuel to be in the loading layer. Burning, and adjusting the highest arrival/dish f in the loading layer, or the high temperature region holding time in the loading layer, or the maximum reaching temperature and the high temperature region holding time in the loading layer. The adjustment of the highest reaching temperature in the in-layer is preferred. (A) The gaseous fuel diluted to the lower limit of the combustion lower limit is supplied above the self-assembled layer, and the highest reaching temperature in the packed layer is adjusted. (B) The gas fuel diluted to the lower limit of the combustion limit is supplied above the self-assembled layer, and the amount of the carbon material in the sintered raw material is adjusted, thereby adjusting the maximum reaching temperature in the charged layer. (C) The gas fuel diluted to the lower limit of the combustion lower limit is supplied from above the charging layer and the supply amount of the gaseous fuel is adjusted to adjust the maximum reaching temperature. Supplying the amount of carbon in the sintering raw material and the amount of gaseous fuel supplied to the gas below the concentration below the lower limit of the combustion concentration.

312 / Invention Manual (supplement) / 96-0 / 95140218 L 1329677 Thereby to adjust the above maximum temperature. # 2 1 9 In (A) (D), it is preferable to adjust the above-mentioned maximum arrival temperature to 1205 ° c to 135 (Tc. The implementation is as follows: The temperature zone holding time < adjustment is better. = The gas is diluted to the lower limit of the combustion lower limit concentration from above the loading layer. The material 'adjusts the high temperature zone holding time in the loading layer. The dilution money is supplied above the manned layer. Burning the gas below the lower limit concentration, and adjusting the gas fuel according to the amount of the carbon material in the sintering raw material and adjusting the high temperature region holding time in the human layer. The gas fuel burning step preferably includes The shape of the combustion and the melting zone is adjusted in the following manner: 1. The gas fuel diluted to the lower limit of the combustion lower limit is supplied above the self-assembled layer to adjust the shape of the combustion and the melting zone. The second combustion of the gas below the lower limit of combustion concentration, the high temperature retention time of the molten zone, and the cold rolling strength of the sintered ore are adjusted. The gas diluted below the lower limit of combustion is supplied from above the packed bed to make at least a part thereof The combustion and melting zone in the above-mentioned charging layer are maintained in an unburned state, and the combustion and the melting zone are separated. 'Adjusting the thickness of the burning and the melting zone in the height direction and/or the width of the movement direction of the table. = Step ' Regarding the supply position of the gaseous fuel, it is preferred to carry out the above-described gas fuel combustion step in the following manner. 312 / Invention specification (supplement) / 96_〇丨/95丨4〇2] 8 11 1329677 (a) supplying a gaseous fuel diluted to a lower concentration below the combustion concentration from above the charging layer, causing the gaseous fuel to be burned in the charging layer, and adjusting the supply position of the gaseous fuel to the charging layer. (b) In the ignition furnace At the rear position, the gaseous fuel diluted to the lower limit of the combustion lower concentration is supplied from above the charging layer to cause the gaseous fuel to be burned in the charging layer. (c) In the region where the thickness of the burning zone is 15 mm or more. In the middle, the gas fuel diluted to the lower limit of the combustion lower concentration is supplied to cause the gas fuel to be burned in the charging layer. (d) After the combustion front reaches the position below the surface layer of 1 〇〇 mm, the supply is diluted to the lower combustion concentration. The gaseous fuel is used to cause the gaseous fuel to be burned in the charging layer. More preferably, after the combustion front reaches a position 200 mm below the surface layer, a gaseous fuel having a concentration lower than the lower limit of combustion is supplied. (e) at the loading layer In the vicinity of the two side walls, the gaseous fuel diluted to the lower limit of the combustion lower concentration is supplied to cause the gaseous fuel to be burned in the charging layer. (1) In the longitudinal direction of the sintering machine, it is supplied to the upper portion of the lower limit of combustion to be diluted below the lower limit of combustion. The gaseous fuel 'burns the gaseous fuel in the charging layer' and adjusts the cold rolling strength of the sintered ore. The gas fuel is preferably diluted to a concentration of 75% of the lower limit of combustion, and the lower and upper flammable gas. Preferably, the flammable gas which is diluted to a concentration lower than the concentration of the lower limit of the dance, and which is 2% or more, is diluted to 25% or less and 2% or more of the lower limit of the combustion concentration, and the gaseous fuel is preferably selected from the group consisting of Blast Furnace Gas, Coke Oven Gas, High 312/Invention Manual (Supplement)/96-〇1/9514〇218 I329677 Furnace and coke oven mixed gas, propane gas, natural gas and methane gas At least one gas of the group. Further, the present invention provides a sintering machine including a cycle moving trolley, a suction bellows disposed below the trolley, a raw material supply device for supplying a sintering raw material to the trolley, and a material for sintering the raw material. An ignition furnace for igniting, wherein the sintering machine is characterized in that: a gas fuel supply device is disposed on the downstream side of the ignition furnace for self-loading above the layer, and the concentration is diluted to a lower combustion concentration The following gaseous fuel is blown into the loading layer. Preferably, the gas fuel supply device is disposed at least one or more in the direction of the length of the sintering machine on the downstream side of the ignition furnace. More preferably, the gas fuel supply device is disposed at a position in the traveling direction of the trolley from a stage from the front of the combustion to a stage below the surface layer until the completion of sintering. Further, it is preferable that the gas fuel supply device is disposed in the vicinity of the side wall. [Embodiment] The manufacturing method of the sinter and 纟σ ore of the present month has a charging step, an igniting step, a firing step, and a gas fuel burning step. The above-described loading step includes the following sintering of the (four) stone and the carbon material on the trolley which is cyclically moved to form a charging layer containing the carbon material on the trolley. In the above ignition step, the ignition furnace t ignites the carbon material on the surface of the charging layer. The second firing step includes the following operations: • The carbon material in the charging layer is burned by being placed in the trolley ^air, and the money is agglomerated by heat. The gas fuel combustion step is self-loaded into the layer: side 312 / invention specification (supplement) / 96-01 / 95140218 13 supply of gas fuel diluted to a lower combustion limit and a / morning M, so that the gas burning Simmer in the loading layer.兮 聛 , , , , Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ Μ ΐ ΐ ΐ ΐ ΐ ΐ ΐ ΐ ΐ ΐ ΐ The sintered lower limit of 75% of the combustion can be prepared for μ ^ ”, 11 rolling bodies. The above gaseous fuel is better, so that

Use a dilution of 60% or less of the 揪 揪 $ μ μ μ $ 了 了 了 了 了 了 了 。 。 。 。 。 。 。 。 。 。 The following flammable gases. The reason why it is preferable to use a flammable gas diluted to a lower limit of the combustion lower limit and 75% or less is the following two reasons. U) Supplying the above-mentioned gaseous fuel to the upper part of the monk, sometimes causing the explosion to burn, so at least at normal temperature, even if there is a kind of fire, it is still in a state of not burning. & (b) On the sintering machine (when the loading layer is not completely burned to maintain the unburned = state and reaches the electric dust collector located on the downstream side of the sintering machine, etc. The state of combustion under the discharge of the I, that is, under the condition of the lower limit of the combustion limit. Further, as described below, the gaseous fuel must be diluted with the concentration so as not to cause the total carbon in the sintered raw material (solid fuel + gas) Fuel) - The air (oxygen) required for combustion is insufficient to cause insufficient combustion. The gas fuel is preferably a combustible gas whose concentration is diluted to 2% or more of the lower limit of combustion concentration. If the concentration is 2% or more, the sintered ore is sintered. The strength and yield will be improved. In addition, the concentration of the gaseous fuel will be adjusted according to the amount of carbon (solid fuel). Further, as described below, by diluting the gaseous fuel, it can be 312/^Μ*(Μίφ)/ 96. 〇 1/9514 〇 21 14 1329677 Adjusting the combustion at a specific area in the loading layer. ^ In the manufacturing method of the sinter of the present invention, the diluted gaseous fuel is supplied to the charging layer after f. ; : The supply of the dilute gas fuel at the position directly behind is not affected by the sintered layer. Preferably, after the formation of the sintered block layer, the diluted gas is poured into the layer. In the layer, the diluted gaseous fuel can be supplied at the arbitrary sound position f. The reason why the sintered agglomerate layer is formed after the dilution of the gaseous fuel is as follows is as follows: After the thinking, the upper portion of the 1 human layer is still not sintered. The supply of the present body (10) in the state of the block has the risk of exploding on the employee's level. b) The supply of the milk fuel is based on the necessity to increase the yield. The part of the sinter strength improvement. In order to adjust the maximum temperature of the loading layer or the holding time of the high temperature region, it is preferable that the thickness of the combustion and the melting zone be supplied to the diluted gaseous fuel under the following conditions: at least 15 touches or more. Preferably, it is 20 mm or more, more preferably 30 mm or more. If it is less than 15 mm, the thickness of the combustion and melting zone will not increase even if the gaseous fuel is supplied by the atmosphere (the mixture of the atmosphere and the gaseous fuel) which is sucked by the sintered layer (agglomerate). Therefore, the effect of gas fuel supply is insufficient. When the thickness of the combustion and the melting zone is 15 or more, preferably 2 〇 or more, and more preferably 30 mm or more, the gas fuel is diluted and supplied, and the thickness of the combustion and the melting zone is wide. Expanded, and the high temperature area stays longer. M2/0 month manual (supplement) solution 1/9514〇2 i 8 15 1329677 Furthermore, the thickness of the above-mentioned combustion and melting zone can be confirmed, for example, by using an ugly tubular test steel with transparent quartz. The supply position of the above diluted gaseous fuel is determined. Further, it is preferable that the gas line is supplied to the lower portion of the surface layer before the combustion, and the combustion and the melting zone are lowered to a distance of more than 10 mm from the surface layer, preferably 2 Å or more, to supply the diluted gaseous fuel. . That is, it is preferable to supply the diluted gaseous fuel to the middle and lower layer regions. For example, the diluted gas fuel is placed in the loading layer after the agglomerate is formed in the above-mentioned charging layer, and the lower layer portion, that is, the I1 white after the burning front line moves 100 mm from the surface layer (to reach the region in an unburned state). In this way, combustion is started, and the diluted gaseous fuel is supplied in this manner. The reason for this is that if the position is lowered by 100 _ or more, the influence of the cold portion which is attracted by the sintered layer is reduced, and the thickness of the combustion and the melting zone is increased. More preferably, if the temperature drops by more than 200 mm, the cooling effect caused by the atmosphere is released, and the thickness of the combustion and melting zone is increased to 30·α. Further, it is more preferable that the supply is performed at both end portions in the width direction (in the f direction straight ahead in the traveling direction of the carriage) in the vicinity of the side wall where the yield is significantly lowered. Furthermore, the gas fuel supply device also differs depending on the scale of the sintering machine, for example, 'the gas fuel supply amount is l, _m3/h~5, G00m3 (standard)/h, about 15,000 tons/day, and the machine tool has a length of At the scale of the 90 m sintering machine, the gas is burned, and the father is placed at a position about 5 m after the downstream side of the ignition furnace. Preferably, in the manufacturing method of the present invention, after the trolley moving portion 312 / invention specification (supplement) / 96 call / 9514 〇 the supply position of the diluted gaseous fuel is generated to generate a sintered block 1329677 to the discharge side of the ignition furnace, The position where the front line of the combustion travels to the lower surface of the surface layer (for example, at least 100 legs or more below the surface layer is preferably about (10) , or less, and the gas fuel is generated; the burning position) is at any position above the i position between the completion of sintering. That is, as described above, this refers to the supply of the gaseous fuel at the stage where the combustion front is moved below the i-layer of the charging layer, and refers to the occurrence of combustion of the gaseous fuel inside the charging layer, and gradually moves to the lower layer. Therefore, there is no danger of explosion, and a safe sintering operation can be performed. In the manufacturing method, the reheating of the agglomerates generated by the "diluted gas burning into the packed bed" and the daily generation is carried out. π, the supply of the gaseous fuel has the following meaning: since the original high temperature region has a short holding time and is likely to cause insufficient heat f, the sintering block having a low cold rolling strength for the sintered ore is supplied to the solid fuel in comparison with the supply of the solid fuel to the portion. The high-gas gas fuel can realize the regeneration and expansion of combustion and melting zone, and fills in the combustion heat of this part which is easy to cause insufficient amount of enthalpy. In the method for producing a sintered ore according to the present invention, it is preferable that at least one portion of the gaseous fuel supplied from the upper portion of the charging layer after the ignition is sucked (introduced) to maintain the unburned state. It is burned, melted, and burned, and supplied in this manner. This is because the effect of the gas fuel enthalpy is considered to be the effect of blowing the gaseous fuel into the charging layer, which does not relax the upper portion of the layer and affects the thickness direction: the melting band is more effective. The reason is that if the supply is performed on the upper layer of the loading layer which is likely to cause heat not to be high: the retention time of the domain is insufficient, sufficient combustion heat is supplied, and the quality of the portion (burning, mouth strength) can be improved. ). Further, if the gas fuel supply action is applied to the middle portion to 312/inventive book (supplement)/96-Gl/9514G218 17 / ::: belt: shape, etc. = re-ignition is formed above the original burning and melting zone Large, can not increase the maximum length of the ^ / ^ band above the width of the extension of the extension of the time, and J, the realization of the high temperature area to ensure that the speed of the sound of the people into the trolley to achieve full sintering. It improves the quality of the agglomerate of the entire penetration layer (cold strength is improved.) The quality of the finished sinter (cold strength) and productivity are improved in the present invention, and the first transformation system is based on Supply 2 The supply of the above-mentioned dilute gas fuel is adjusted as follows: the use position and the effect of affecting somewhere in the layer: the supply position, and the second characteristic is: according to the amount of solid fuel, the following: The supply of the above-mentioned fuel is the same, and the holding time of the ν up/dish and the temperature range in the loading layer is adjusted to some extent. To the dream = turn μ, & good is 'When the above diluted gas fuel is supplied,: ,: 3 when entering the raft, 'not only adjust the position of the supply, but also adjust the shape of the fuel, the second, the fusion zone itself, and further adjust the maximum temperature of the combustion, the melting zone and/or the holding time of the high temperature zone.言 'With the movement of the trolley, the burning (flame) front line gradually increases and the square (downstream side) expands. The position of the burning and melting zone of the charged layer after ignition changes as shown in Fig. 4(a). And, as shown in Figure 4(b)), in sintering The heating process in the sintering process is different in the upper layer and the lower layer, as shown in the figure, between the upper layer and the lower layer: the Gutian area retention time (about 12 〇 (rc or more) is very different. The result, = The layer forms a yield distribution as shown in ® 4(c), that is, the surface layer portion (lower layer yield is lower) and a high yield distribution is formed in the middle layer and the lower layer direction. 'This, 312/invention specification (supplement)/96 01/95140218 lg 1329677 f According to the method of the present invention, when the gaseous fuel is supplied, the combustion and melting τ change in the direction in which the thickness or range of the upward and downward directions is expanded, which reflects the improvement in the quality of the finished sintered ore. Since the middle layer and the lower layer of the high-yield distribution can further adjust the holding time of the high-temperature region, the rate can be further improved. By adjusting the supply position of the gas fuel, the shape of the combustion and the melting zone can be adjusted, that is, the height direction of the band. The thickness and/or the width of the moving direction of the table, and the maximum reaching temperature and the holding time of the high temperature region can be adjusted. These adjustments make the effect of the present invention even more remarkable. The expansion of the upper and lower thickness of the burning and melting zone and the adjustment of the maximum temperature and the holding time of the high temperature region can often achieve sufficient firing, thereby contributing to the effective improvement of the cold rolling strength of the finished sintered ore. In the invention, the supply of the gaseous fuel to the intrusion layer may be performed to adjust the cold rolling strength of the entire sintered ore. In this respect, the purpose of injecting the gaseous fuel is to increase the sintered mass and further burn, The cold rolling strength of the antimony ore, especially the adjustment of the gas fuel supply position, the retention time of the high temperature region such as the time when the sintering raw material stays in the combustion, the melting zone, and the adjustment of the maximum reaching temperature, so as to cool the sintered ore. The shatter index (SI) is about 75% or more to about 85%, preferably 80% or more, and more preferably 90% or more. In the present invention, it is preferable to adjust the concentration of the gaseous fuel, the supply amount, the blowing position, and the like, in consideration of the amount of the carbon material to be sintered (in the case where the input heat is fixed). And it is cheap to implement by blowing in the range. Furthermore, 'increasing the cold rolling strength of the sintered ore, on the other hand, has 312/invention specification (supplement)/96-01/95140218, „1329677, which causes an increase in ventilation resistance and a decrease in productivity, so in the present invention The above problem is eliminated by adjusting the maximum reaching temperature and the holding time of the high temperature region, and as a result, the cold rolling strength of the sintered ore is improved. Further, when the sintered ore produced by the actual sintering machine is used, the above-mentioned cold rolling strength 丨The value indicates an SI value that is 10% to 15% higher than the pot test value. In the manufacturing method of the present invention, the adjustment of the gas fuel supply position in the moving direction of the trolley is generated by how to set the self-loading layer. For the adjustment, in the present invention, it is preferred to adjust the gaseous fuel supply device according to the carbon material 1 (solid fuel) in the sintering raw material. The size (size), the number of summers, the position (distance from the ignition furnace), and the gas concentration, thereby not only mainly adjusting the size of the combustion and the melting zone (the vertical direction and the width of the trolley moving direction), but The high temperature reaching temperature and the high temperature region holding time are also adjusted, thereby adjusting the strength of the sintered block formed in the charged layer. In the above manufacturing method of the present invention, the gas fuel is preferably configured to: use blast furnace gas, Any one of a coke oven gas, a mixed gas of a blast furnace and a coke oven, propane gas, weather or methane, or a mixed gas thereof. The gas 3 has a combustion component, and is diluted with air or the like to be used as a concentration' It is a gaseous fuel that burns less than about 75% of the lower concentration. Further, the dilution of the gas can be diluted with an inert gas by using: gas: gas and oxygen, inertia and air, and ^Gas and oxygen are also combined for dilution. 'When the method of manufacturing the sintered ore of the present invention is carried out, a sintering machine is used. The sintering machine is a lower suction type DL (belt type) sintering machine as described below: 312/发_ Mingshu (supplement)/96-01/95140218 20 1329677 Underneath the trolley that is loaded into the layer and circulated and moved = Use the cypress, the raw material supply device is provided on the trolley, and the ignition furnace is provided on the downstream side of the device , and And in the above-mentioned ignition furnace: two gas fuel supply skirts are arranged for loading the gas into the layer above the loading layer and diluting into a concentration lower than the lower limit of combustion concentration, the gas fuel supply device Preferably, it is disposed so as to straddle the two side walls of the trolley along the width direction of the machine. In the above, the composition of the material supply device is relatively good, and a blower hood for supplying the diluted gaseous fuel is disposed or disposed in the blower hood, and is provided with a chaotic fuel or a diluted gaseous fuel. The tube is blown, and the blowing tube has a slit shape or the blowing nozzles are arranged in a plate shape. Further, at any position on the downstream side of the ignition furnace and in the traveling direction of the trolley during the traveling of the combustion melting zone in the loading layer, one or more of the above-mentioned gaseous fuel supply devices are disposed, and the above-mentioned gas supply means is supplied to the loading layer Preferably, the gas fuel is supplied at a position after the carbon material charged in the layer is ignited. That is, at the downstream side of the ignition furnace and at any position after the combustion front line travels below the surface layer, one or several devices are disposed, and the root '掳 adjusts the viewpoint of the cold rolling strength of the target sintered ore. Preferably, the gas fuel supply device is disposed at a position of a low-yield portion near the two side walls; and the gas fuel is diluted to a concentration lower than 75% of the lower limit of combustion and 2 More than or equal to flammable gas, the flammable gas is diluted to a concentration lower than or equal to 6% by mass and 2% or more. 312 / invention specification (supplement) / 96-01 / 95140218 21 丄 677 from * above 4 'in accordance with the present invention, for the operation of the lower suction sintering machine' by using the diluted gas above the self-installed layer The fuel can be burned at a position as a target in the charging layer, and in this case, by adjusting the supply position of the diluted gaseous fuel, the maximum reaching temperature at the time of combustion, and the holding time of the high temperature region, The following operations: not only improve the easy & burn-in and the chilled strength of the sinter is easy to reduce the strength of the loading layer on the loading layer, and increase the strength of the layer below the layer, the ore strength. Further, in the present invention, it is possible to improve the air permeability of the entire manned layer, and to adjust the position of the belt in the vertical direction and the width of the moving direction of the trolley, for example, by adjusting the reaction of the combustion and the melting zone, for example, by adjusting the width of the belt in the vertical direction of the belt. Since the strength of the agglomerate is good, the finished sintered ore having a high cold rolling strength of the sintered ore can be produced with good yield and high productivity. Further, if the sintering machine of the present invention is used, the operation of the above sintering machine can be stably performed. Fig. 5 shows an embodiment of the apparatus for producing a sintered ore according to the present invention. The invention is not limited to the illustrated embodiment. A gas fuel supply device (exhaust hood) 12' for blowing a gaseous fuel such as a blast furnace gas and a coke oven gas (gas) gas is placed on the downstream side of the moving direction of the ignition furnace 1G. It is only equipped with a balcony. The gas fuel supply device 12 includes a structure in which a plurality of tubular gases are blown into the nozzle 12a downward and arranged in the machine width direction. The plurality of tubular gas injection nozzles 12a are disposed so as to cover the charging layer from above the side wall (not shown) via the gas fuel supply device 12. The helium gas supplied from the gas fuel supply device 12 is sucked from the upper portion of the loading layer through the agglomerates formed on the surface layer to the deep portion 312 of the loading layer by the suction force of the bellows under the trolley 8 (supplement)/96-01/95140218 „ ^29677 When it is intended to improve the quality of the area shown in Figure 4(c), it is preferable to use the above nozzles near the two side walls of the vehicle. A large amount of gaseous fuel is supplied at a position. - a gaseous fuel that can be supplied to the stage supply 412, such as a gas, a gas, a gas, a coke oven gas (c. 2), a gas, and a gas. The mixed gas of coke oven gas (helium gas), propylene compound 3, natural gas (LNG) or methane, or the like: the fuel may be separately independent of the ignition furnace, the piping system:; two =. X, It can also be configured as follows: • It is disposed in conjunction with a diluent gas guide tube in a pipe for use with a fuel for ignition furnace, and the concentration of the emulsion fuel is adjusted to be equal to or lower than the lower limit of combustion concentration, and then connected thereto. The extension of the gas supply pipe (not shown) to the ignition furnace 10: Table 1 below shows the lower limit of the combustion limit and the upper limit of the blowing concentration of each of the various gaseous fuels used in the present invention (75%, 6〇%, 2俨 concentration). For example, for propane gas, the lower limit of combustion is 2 2 vol%, the upper limit of the blown gas concentration diluted to 75% is 1:7 vol%, the upper limit of the blown gas concentration diluted to 6 〇% is 1.3 vol%, and the blown gas concentration diluted to 25% is 4. 4% by volume. The concentration at which the blowing effect starts to appear, that is, the lower limit of the blowing gas concentration after dilution is 0.05% by volume. Therefore, the preferred range is as follows. Preferred range (1): 2. 2体积%~〇. 〇5 vol% preferred range (2): 1.7 vol%~〇. 〇5 vol% preferred range (3): 1.3 vol%~〇. 〇5 vol% 312/invention manual (supplement) ) /96-01/95140218 23 1329677. Preferred range (4): 0.4 body · ~ 〇〇 5 vol% In the C gas, the lower limit of the blowing gas concentration of the lower limit of combustion is 3 8 : 2 5 vol% 'diluted to 75 % ^ ^ L Shan. 8 vol%, diluted to 60% of the upper limit of the blown gas concentration is 3.0 vol%, 鞴锩9 in person Rolling 0 9 r^〇/ ^ diluted to 25% of the blowing gas concentration is

〇: 9 body... The blowing effect (4) begins to show that the lower limit of the H blowing gas concentration is 〇.24 body P after dilution. * Hip volume%. Therefore, the preferred range is as follows

车佳佳 range (1): 5 · 0 vol% ~ 〇. 24 vol% preferred range (2): 3. 8 vol% ~ 〇 · 24 vol% 杈 better range (3): 3 · 0 vol% ~ 〇 24 vol%, preferably range (4): 0.9 vol% to 〇24 vol%, in the second, the lower limit of combustion concentration is 48 vol%, diluted to the second two: the upper limit is 3.6 vol%, diluted to _ The gas enthalpy is limited to 2.9% by volume, and the concentration of the blown gas diluted to 25% is 〇.9

volume%. The lower limit of the blown gas concentration after dilution is vol%. Therefore, the preferred range is as follows. Preferred range (1): 4.8 vol% to 〇·丨 volume% Preferred range (2): 3.6 volume such as 匕: 体积 vol% preferred range (3): 2. 9 vol% to 〇. 1 vol% Preferred range (4): 0.9% by volume to 〇·ι% by volume The lower limit of combustion in the blast furnace gas is 4〇()% by volume, and the upper limit of the gas entering the dilution to 75% is 3〇. 〇% by volume 6体积百分比。 The blown gas concentration was 7.6% by volume. The lower limit of the blown gas concentration after dilution is 〇24 volume 312/invention specification (supplement)/96-〇1/9514〇218%. Therefore, the preferred range is as follows. Preferred range (1): 40.0% by volume to 125% by volume Preferred range (2): 30. 〇% by volume to 125% by volume Preferred range (3): 24.0% by volume to 125% by volume Preferred range (4) : ^ volume ^ ~ ^ tray volume %, time 'Table 2 shows the content of CO, decane, ethane, propane and hair sputum as combustion components of C gas, lng, B|l body. Table 1 ”, Gas-propane^-- Lower limit of combustion concentration %, relative to air (lower limit of explosion, upper limit of 2.2 - 1 blowing concentration, relative to air (75%) 〇 blown in upper concentration %, relative to air (60 %) IV blown in %, relative to air (25?0 j fire temperature air-, °c Μ. __methane co i艚4.0 ' 5.0 1 O c 〇3.8 1· 0 〇Γ 0Α) ϋ· 4 0.8 Ο ' -5282i5M _580 ~Μη βΚΛ - .Coke oven i艏-J.NG Γ 5.0 4.8 9.4 3.8 3.6 r 7.5 3.0 2 ο ^.3 -0.9 Π π b5U~7Rn _ 6t>8~674 About 630 煎. Russia _ 40.0 — 30.0 20 υ, y Γ 5 i5*68 (i~~ nsunm Table 2

, ~-~~~~^~~~^~~=____=_L —— ητ~ The following is described as an opportunity to develop the method for producing a sintered ore according to the present invention. The experimental device shown is a vertical tubular test crucible (150 x 400 mmH) with clear quartz®, using a mixture of blast furnace gas and coke oven oxygen (helium gas) as the gaseous fuel used, and used with the applicant company. The sintering raw materials of the same raw materials used in the sintering plant, that is, the sintering raw materials shown in Table 3, have a lower suction pressure of 25 312 / invention specification (supplement) / 96-〇1/9514〇218 1329677 11.8 Kpa fixed An example of the operation performed under the conditions. In the example, the concentration of the combustion component of the helium gas is diluted with air to vary within a range of 0.5% by volume to 15% by volume. Further, the lower limit of combustion concentration of the helium gas used for the real thing was 12% by volume. Table - Proportion of raw materials (Robe River) 1 J ν Β Μ. 7〇J _ Yanshi 2Γ~8 _ Cara ias 42 0 Limestone 16.6矽石 2 7 Coke powder 4. 7

The situation 'is especially indicative of the situation in which the front of the combustion drops as it moves. As can be seen from Fig. 6, when a gaseous fuel containing 15% by volume of μ gas exceeding the lower limit of combustion concentration (12% by volume) is blown into the raw material accumulation layer in the test pot, the gaseous fuel immediately starts to burn on the surface of the packed bed. It does not reach the lower layer of the loading layer, so the blowing effect is small. On the other hand, according to the present invention, when a gaseous fuel which is diluted with air to a lower limit of the combustion limit of the gas fuel, that is, 75% by volume or less, which is 75% by volume or less, is used, it does not burn on the surface of the raw material accumulation layer. It reaches the depth in the loading layer, that is, the burning and melting zone. As a result, the thickness of the combustion zone (also referred to as combustion, melting zone) at the time of sintering in the atmosphere is 7 〇 mm, and in this example, the thickness of the combustion zone can be expanded to 150 mm, that is, twice or more. That is, the enlargement of the thickness of the combustion zone is nothing more than an extension of the holding time of the high temperature region. Moreover, in the experiment of the test pot, when the combustion front line travels with the trolley of the actual sintering machine, the descending speed of the combustion belt (the reciprocal number is burned 312 / invention specification (supplement) / 96 · 〇 1 / 95 μ 〇218 26 1329677 f time) is accelerated by the supply of dilute gas fuel, and as in the case of increasing coke: time and blowing high temperature air, the thickness of the combustion zone can be increased in the up and down direction. When the diluted emulsion fuel is appropriately blown into the charging layer, it is known that the width of the burning belt is enlarged and significant, and the combustion front line is compared with the case where the solid fuel, the liquid fuel, and the flammable gas are used. The descending speed is also almost unchanged from the sintering of the atmosphere, and travels at the same speed. Fig. 7(a) and Fig. 7(d) summarize the results of the test for the sintered steel of the above experiment. According to the results, according to the present invention, when the raw material is charged into the layer to appropriately blow the diluted helium gas, although the sintering time hardly changes, the yield is somewhat higher (Fig. 7(a)), and Sintering productivity is also increased (Fig. 7(b)). Moreover, the fracture strength (si) of the cold-strength strength management index, which has a great influence on the operation performance of the furnace, is also improved by more than 10% (Fig. 7(c)), and the reduction pulverization property (RDI) is also improved by 8% (Fig. 7). 7(d)). In the present invention, the gas fuel supplied to the packed bed is a gas which is diluted and released, and the degree of dilution will be described below. Table 4 shows the lower limit of combustion of the blast furnace gas, the coke oven gas, and a mixture of the two (M gas), propane, smoldering, natural fluorine, and the upper limit of combustion. For example, if the rolling body having the above-described burning limit is not combusted in the charging layer and is led to the exhaust fan, there is a risk of explosion or burning at the electric dust collector or the like in the middle. Therefore, as a result of the trial error of the inventors 4, it was confirmed that the gas fuel having the limit of the above-mentioned danger, that is, the concentration is diluted to the lower limit of the combustion, and the use concentration is further increased to 75% of the lower limit of the combustion in order to further improve the safety. The following gaseous fuels did not cause any problems in many experiments. 312/Invention Manual (Supplement)/96-01/95140218 27 1329677 For example, the range of combustion of blast furnace gas is as shown in Table 4. At normal temperature in the atmosphere, the lower limit of combustion is 40% by volume (ie, less than 4% by volume) When it is not burned, the upper limit of combustion is 71% by volume. This means that if it exceeds 71% by volume, the concentration of the blast furnace gas is too rich, and it becomes unburned again. The basis for this value is explained below based on the schema. Table 4: Furnace gas miscellaneous _ burning lower limit 4〇η ___ combustion upper limit coke oven IL miscellaneous - 71 mixed gas plating (Μ gas 艚, 0 · u Γ27η 22 ~ 12~ one example. Off, in the blast furnace gas The ratio of the combustion component (flammable gas) and other inert gas components contained in the combination of (10) and (7) and N2 was studied as follows. (1) The ratio of the combination of H2 and C〇2"' (inert gas flammable gas) is 3.5/20.0 = 5.7. Therefore, 'the combustion limit map is obtained from the main axis _ m touch, Γ 表 in the ratio of (inert gas) / (flammable gas) on the horizontal axis of the disk 5 7 a & ^ ΙΑ ^ . The intersection of the Η2 + C〇2 curve (combustion limit). The lower limit is u ^ _π The horse 32 volume / g ' upper limit is 64% by volume. That is, the lower limit of the combustion limit of H = 32% by volume, the upper limit is 64 volumes ❶ JL f :, in the case of the combination of "CO and N2" as the remaining combustion component, G gas (g gas) / (flammable gas) The ratio of L Sapporo is 53.5/23.0 = 2.3, so the same 'from the figure' is based on the horizontal axis? • The intersection of the seven mountain phase axis 2.3 and the curve of CO+Nz is 44% by volume, and the upper limit is 74 ^ & . . . The upper limit is 74% by volume. Therefore, the lower limit of the combustion limit for this case is 44. / , The basket %' upper limit is 74% by volume. 312/Invention Manual (Supplement)/96_〇1/9514〇218 28 1329677 Further, the lower limit of combustion of the blast furnace gas containing two combustion components can be obtained by the following formula. The lower limit of combustion is 100/(23.5/32 + 76. 5/44) and 40%. If the above upper limits of (1) and (2) are applied, the upper limit of combustion can be determined. In this way, the lower limit of combustion of the blast furnace gas and the upper limit of combustion can be obtained. Further, in the present invention, another reason for focusing on the lower limit of combustion of the gaseous fuel is as follows. Fig. 9 is a graph showing the relationship between the concentration of the combustion component (combustion gas) of the gaseous fuel and the temperature at normal temperature in the atmosphere. (Refer to the C〇rona Society Burning Guide). While the combustion limit can be obtained by the above-described method, the combustion limit has a temperature dependency. For example, although the lower limit of combustion at a normal temperature (corresponding to the concentration of the combustion gas in the drawing) is about 4% by volume, the following case is obtained. It is known that it varies from 26% by volume to 27% by volume in the region of 200 ° C, becomes several vol% in the region of 1 000 ° C, and does not reach i vol % in the region of 12 〇〇 ° c. combustion. φ It can be seen that the concentration of the gaseous fuel supplied to the packed bed (the content of the combustion component) is safe if it is diluted to a safe area lower than the lower limit of combustion at normal temperature, and is safely adjusted as before. The concentration of the diluent gas is also increased in the degree of freedom in the combustion position adjustment in the thickness direction (temperature distribution) in the layer. It is also known that although the gas fuel is burned as described above, it has temperature dependence. For example, the higher the ambient temperature, the wider the combustion range, and the combustion often occurs in the temperature field near the combustion and melting zone of the sintering machine. In the temperature range of about 200 ° C in the electric dust collector on the downstream side of the sintering machine, 312 / invention specification (supplement) / 96-01 / 95140218 29; at the concentration shown in the preferred embodiment, it does not burn. , when the sintered ore is produced, the pore fuel supplied to the charging layer of the sintering raw material is attracted by the bellows of the trolley τ, and is burned by the ft solid fuel (coke powder) The resulting combustion, the high melting zone • burning in the area. Therefore, at the time of the supply of the gaseous fuel, the amount of the coke powder in the sintered raw material can be adjusted (reduced) by adjusting the concentration of the gaseous fuel and the supply of the gas to the charged layer. Further, the gas/length adjustment means that the t-fuel is burned at a desired position (concentration region) in the charged layer. In the above sense, the combustion, melting zone in the loading layer based on the prior art refers to the zone in which only the solid fuel (coke powder) is burned, and in the present disclosure, the coke powder may be excluded. In addition, the gas fuel is further brought together by the gas. Therefore, in the present invention, the concentration of the gaseous fuel and the other supply conditions of the feed amount Y are based on the premise that the coke powder is contained as a part of the fuel, and when the relationship is appropriately changed, the highest temperature and/or the temperature can be reached. Or the high temperature zone is maintained for the desired adjustment to increase the strength of the agglomerate. Another reason for using the diluted gaseous fuel in the method of the present invention is to adjust the strength and yield of the agglomerate by adjusting the form of the sintering and the melting zone. This is because the dilute gas fuel can effectively function by adjusting how long the agglomerate is held in the high temperature zone (combustion, melting zone) and how high it is reached. In other words, the use of the above gas fuel means that the high temperature region holding time of the sintering raw material is adjusted to be long, and the highest reaching temperature is appropriately increased. Moreover, the adjustment refers to the amount of solid fuel (coke powder amount) in the raw material of the raw material 312/invention specification (supplement)/96*〇ι/95140218 30 1329677, which does not generate combustion-supporting in the combustion environment after dilution adjustment. Excessive or non-sufficient gas (air or oxygen). In this case, in the prior art, the amount of solid fuel of the sintered raw material is not related, and the concentration of the combustible gas is not adjusted, that is, the combustion-supporting gas (oxygen) corresponding to the amount of the solid fuel and the amount of the combustible gas is caused. Insufficient, resulting in poor combustion, or conversely, partial overburning resulting in uneven strength. That is, the present invention is used after the concentration adjustment of the gaseous fuel is diluted, so that the above problems can be avoided. Next, the effect of the diluted gaseous fuel supplied for dilution of each type of gaseous fuel is disclosed. The figure shows the conditions and results of a comparative experiment of the conventional sintering method (not blown into a gaseous fuel) and the sintering method of the present invention using a gas fuel diluted to a lower combustion limit or lower. In the conventional sintering method in which the dilution gas fuel is not blown, 5% of the coke powder is used as an example, and in the blowing example of the diluted gas fuel according to the present invention, the diluted gas fuel equivalent to 〇 8% of the coke powder is blown. In order to fix the total amount of heat, the amount of coke powder added was set to 4.2% by mass. In the case of dilute gas fuel use, the crack strength, the yield of the finished product, and the productivity are also observed. In the case of the use of the diluted gas fuel, the reason for the improvement of the fracture strength and the yield of the finished product is considered to be due to The combustion is indicated by the combustion condition, and the expansion of the melting zone is caused, and it is known that the temperature retention time is prolonged. Figure 11 is a graph showing the effect of the concentration of the blown gas when propane gas and (the gas is used as the gaseous fuel), which indicates the concentration of the diluted gaseous fuel and the fracture strength (a), the yield (8), the sintering time (c), The relationship diagram of productivity (4). It can be understood from the figure that when it is used in the gas of the hospital, it is used as a diluent gas to burn 31j 4〇2 jg: it is added to increase the fracture strength. 5 volume test produces effect, indeed Second: there is almost the same improvement effect. The effect produced by the C-burning gas is from the 〇. i volume% starts, preferably 〇. 2 vol%, the change, the c-rolling body' by adding 〇24 5% by volume

^ Body (4) or more, the improvement effect is more than 1% by volume. Therefore, when it is a propane gas, it is at least G. 〇 5 vol% or more, preferably Q. } volume / ° or more ‘more preferably 〇. 2 body (4). On the other hand, in the case of C gas, it is preferably 0.24 vol% or more to J. 5% by volume or more, more preferably 1. 〇 vol% or more, and the upper limit is 75% or less of the lower limit of combustion concentration. Further, in the case of propane gas, the effect is substantially saturated when 〇·4% by volume is added, and the gas concentration at this time corresponds to 25% of the lower limit of combustion.

Next, according to the method of the present invention, the cold rolling strength and the reduction pulverization property (RDI) of the sintered ore produced by supplying the above gaseous fuel will be described in consideration of the amount of the carbon material in the sintering raw material. According to "Polyline Engineering" (Imai Hideki, Takeuchi Shoujiu, Fujiki Ryo, 1976, 175, Asakura Bookstore), the schematic diagram of the sintering reaction is summarized as shown in Fig. 12. Further, Table 5 shows the values of tensile strength (cold strength) and reducibility of various minerals formed during sintering. As can be seen from Fig. 12, in the sintering process, the melt is started to be formed at 1200 ° C, and the ferrite which is the strongest in the constituent minerals of the sintered ore and which is less reducible is formed. When the temperature is further increased and exceeds about 1380 ° C, it is decomposed into a non-amorphous austenitic acid salt of the cold strength and the lowest reducibility, and a secondary hematite which is easily reduced and pulverized. Therefore, in order to improve the cold rolling strength of the sintered ore and improve the RDI, it is possible to stably form the calcium ferrite without decomposing it. 312/Invention manual (supplement) foot-〇1/95140218 32 1329677

Tensile strength (MPa) Reduced hematite 49 Magnetite 58 ^__ Calcium ferrite 102 Calcium citrate 19 — *1 〇 — The precipitation of secondary hematite from the origin of reduction of the ore of the mine, as shown in the figure The description is shown in ΐ3. According to the description, the twin-shaped hematite, which is the result of the mineral synthesis test and the starting point of the reduction pulverization, is heated to the Μ.π + Liq. region and is cooled and precipitated, via the state diagram (2). The path is formed instead of the path to produce a sintered ore, whereby the reduction pulverizability can be suppressed. Therefore, in order to produce low RDI sinter and high-strength sinter, it is important to be in the range of 12 ° ° C (solid phase temperature of calcium ferrite) and about 138 (rc (transfer temperature)). The method realizes a heat pattern which is maintained in the loading layer for a long time. Therefore, it can be seen that the maximum reaching temperature of the charging layer for adjusting the amount of the added carbon material by the supply of the gaseous fuel is more than 12 〇〇C. It is less than 138 (TC, preferably 1 20 5 ° C to 135 (in the range of TC. Then, the inventor, etc., knows the relationship between the width of the combustion zone and the diluted fuel gas, and uses a vertical window with a transparent quartz window) The tubular test pot was tested and the acrylic gas diluted by the exhaust gas of the sintering machine cooler was blown from above the pot into the charging layer of the sintering raw material. The sintering raw material used in the experiment was the applicant company. The volume of the propane gas is diluted to 0.5% by volume and 2.5% by volume. In addition, when the input heat is converted, the pressure is approximately 1200 mmih. Equivalent to blowing into the 05 body % of propane gas, and 312/invention specification (supplement)/96-01/95140218 33 1329677% by mass of coke powder is added. Fig. 14 is a photograph showing the observation result of the combustion zone when the propane gas is blown in the experiment. As shown in the figure, the propane gas diluted to a concentration of 25 vol% is burned on the raw material charging layer immediately after the blowing, and the gaseous fuel does not enter the charging layer, so there is no effect. When propane gas having a concentration dilution of 0.5% by volume with respect to air is used, it does not burn in the upper portion of the packed bed, but enters the inside of the packed layer and rapidly burns in the packed layer. As a result, compared with the atmosphere Under the condition, the width of the burning belt in the vertical direction is about 70 mm. When the diluted propane gas is blown in this way, the width of the burning belt (that is, 'corresponding to the holding time of the high temperature region) is expanded to _, which is twice or more. Therefore, it can be seen that when the concentration of propane is 1/5 gp 〇 5 vol% of the lower limit of combustion concentration ant = 'relative to air), the effect of expanding the combustion zone is also found. On the contrary, the gas of the present invention is also known. Fuel blowing In-burn combustion adjustment. Burning, it is difficult to carry out the loading layer in the experiment. 'There is also a review of the falling speed of the burning zone (it = zone holding time). As a result, only the increase in blowing high temperature air When the dilute gas fuel is used, the combustion rate is significantly accelerated, so that the combustion belt is almost indistinguishable from the large-scale sintering. .

(4) However, the inventor of my dilute gas fuel blows the position of the impact of the 312 / invention manual (supplement V96-01/9514021S 34 丄 / s Hai inspection method as shown in Table 6. Every private ★ κ test NO · The basis of the current situation of adding 5 mass% of coke to the 1st sintering raw material, 'good condition, the inspection No. 2 system reduces the proportion of coke powder by 1% by mass to 4% of the number of people, and instead blows it into the 〇· 5 volume of C-burning gas input 埶蚩囡金玫从. New 曰...Ligu 疋 conditions; experimental NO. 3 series added 2 (four) coke powder conditions; experimental paper 4 series to verify and heat furnace (Japanese patent special The condition of blowing a high-temperature gas of 450 ° C for the purpose of the difference of Kai-Sho 60 - 155626. NO. 2 NO. 3 NO. 4 NO.

--Two, ▼, —, mm A4, only J ~ ^ ^ 1 _ degrees (relative to air, volume JiA furnace (blowing into 45 (ΓΓ 埶) a., Figure 15 shows the result, its system An example of the use of riding (10) (C gas) as a gaseous fuel. This figure shows the investigation result of the relationship between the blowing position and the sintered crushing strength of the finished product and the yield of the finished product when the gas fuel is blown. The blowing position is set to a position of 100 mrn to 200 mm from the surface of the loading layer, a position of 200 mm to 3 mm, and a position of 300 mm to 400 mm. From the results shown in the figure, it is known that the blowing is performed. When the position is 1〇〇mm~2〇〇mm, the bright (white) light in the figure shows that the burning and the smelting belt move to the position of 100 mm, and the diluted gas fuel is supplied from above the test pin, and is located at 100 mm~ During the period of 2 〇〇mm, the dilute gas fuel is burned in the burning and melting zone, and similarly, at the position of 200 mm to 300 mm, the self-combustion and melting zone reach the position of 2 〇〇mm, and the supply from the test pot is started. Dilute the gaseous fuel, and then in the same position from 300 mm to 400 mm Self-combustion, melting zone arrival 312 / invention specification (supplement) / 96-01/95140218 35 1329677 300 mm position starting stage 'supply of dilute gas fuel. Again, for reference' also shows that there is no conventional method The dilute gas fuel is blown into the fire and the melting zone of the above-mentioned layers. The supply of the combustion air of the test steel is the same as the normal sintering operation, and flows downward from the top. Therefore, when the gaseous fuel is added, The gas fuel is added to the combustion gas in a manner that reaches the concentration of #. As shown in Fig. 15, the bright (white) shows that the combustion and melting are in the area of 1 〇〇 to 200 mm, which is only slightly smaller than the conventional method. Thicker. In the area of 2 〇〇 ～ 〇〇 〇〇 , , , , , , 燃烧 〜 〜 〜 〜 〜 〜 〜 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧 燃烧In this case, it is preferable that the dilution gas fuel is blown into the combustion and melting zone portion of the sintering machine trolley in a region of 200 mm or less from the surface of the charging layer, and the gas fuel can be supplied. The body fuel makes (4) the reduction of H. For the area where the surface of the unloading layer is not up to the lion, even if the gas fuel is not forcibly supplied, the fragmentation strength of the sinter is greatly increased due to the supply to the area below 200. It is also possible to improve the overall yield of the finished sintered ore. Fig. 16 is a schematic representation showing the combustion of the upper layer portion and the lower layer portion of the layer above the surface of the layer 2 〇〇miB$ and the lower layer portion. The front head A indicates the direction of travel of the sintering (fuel direction), and Fig. 16 (the burning position of the coke powder and the gas fuel in the layer (<>>) ^ At this time, the burning belt is shaped as the shoulder of the burning belt Ben narrow, the line of powder belt and money burning belt (four) ^ gas burning 312 / invention manual (supplement) / 96-01/95140218 36

荦it·occupies 9', so it is formed in the temperature map area revealed by the right side of the figure: in this temperature distribution, the burning of coke powder (solid fuel): domain 矣: part of the shirt line, will The temperature I of the gaseous fuel burned above it is a non-hatched portion. According to the figure, in the upper part of the loading layer, the temperature of the high temperature region during the period of time indicated by the combustion of the gaseous fuel (the two are close to each other and burned in the second figure) is as shown in the figure. In other words, the burnt-down region in which the hatching portion is formed is a slightly expanded temperature distribution. For example, it is preferable to supply the gas fuel to the combustion layer and the smelting zone 2 to be 15 mm or more. Supply, the above situation is the same as when the original high = domain holding time range is narrow, the gas fuel blowing effect is low, and Figure 3 (b) is the case of supplying gas and material to the middle and lower parts. In the middle layer and the lower layer, as the combustion zone moves from the upper layer to the lower side, the temperature of the layer is also increased, so that the width of the burning zone is enlarged, and it burns at a position further deviated from the case of Fig. 16(a). The result is iwb. The temperature distribution shown on the right side, that is, the burning point of the gaseous fuel away from the burning point of the solid fuel (coke) shown by the hatching, so the temperature distribution curve synthesized forms a large temperature distribution at the base. Therefore, I, I Solid solid The holding time of the high temperature region generated by the combustion of the material and the gaseous fuel is prolonged, thereby increasing the fracture strength of the obtained sintered ore. Furthermore, in the example of Fig. 16(b), the holding time of the high temperature region is adjusted. The ignition temperature of the gaseous fuel is preferably 4〇〇〇c~8〇〇c>c, and the ignition temperature is 50 (TC~700〇C). The reason is that if the ignition temperature is less than 400 C, it cannot be Expanding the high temperature region, and only expanding the distribution of the low temperature region, if the surface exceeds 8 〇〇C, it is too close to the solid fuel to burn the $ (four) domain __, making it high (4) Effect of prolonging the domain material time Next, an example of a method of supplying the diluted gas fuel to adjust the highest arrival in the packed layer = the temperature in the layer) is shown. Fig. 1 is a schematic view showing the case of sintering the internal-degree distribution. Based on the temperature of the conventional sintering method and adding 5% by mass of solid fuel (coke powder) as a reference, the description of the X method is as follows. For example, in the sintering of 5% by mass of coke, the conventional sintering method is used. Expressed by curve a... In general, 4 works: When the domain is maintained 'It is effective to increase the amount of coke powder used. For example, the absence of the dotted line a indicates that the coke powder is added in an amount of 1% by mass. The high-temperature region retention time indicated by the layer thickness is expanded from (〇_A) to (3)-B) 'But the maximum temperature is also (4) 13_ rises to about m generation c, so low-Rdi and high-strength sinter can not be obtained. In the above case, in the sintering operation method according to the method of the present invention, the amount of coke t used is controlled to 4· 2% by mass, on the other hand, because of the dilution of the C-rolled body by blowing i, the maximum temperature reached can suppress 纟127 (TC, and at the same time, since the holding time of the high-temperature region is expanded to (0-0, the Yin can be fully realized) In the conventional method, it is impossible to manufacture low RDI, high strength = Shi Guang 0 ' ° In short, the conventional sintering method focuses on adjusting the high temperature region to maintain the current temperature. However, the present invention: the amount of use (for example, (4) on the basis of 4·2%), = temperature s 135 (TC) for adjustment, on the other hand, is also; = into the diluted milk fuel to adjust the high temperature region to maintain The operation of the time ^ ^ 312 / invention manual (supplement) / 96 · 01 / 95 ΐ 4 〇 2 ΐ 8 38 1329677, the curve d of Figure 16 shows the example of only reducing the amount of solid fuel used to 42% by mass The highest reaching temperature is also low. The high temperature region holding time is also shown in Fig. 18. As a conventional sintering method, there is an example in which 5% by mass of the sonic powder is used. As a suitable example of the present invention, a common blowing amount is used. 4.2 Example of a coke powder and a concentration of 2.0% by volume of diluted lean gas. According to the thermal image of the figure, it is known that in the conventional method, in order to maintain a high temperature region

Hold time and produce more than 1400 燃烧 of burning. On the other hand, t is used to control the amount of the coke powder to be used in an amount of 2.2% by mass, and is blown into a concentrated 2-body C gas. The area of C disappears and forms the following shape: The temperature of the most reachable temperature is controlled below 1350 〇C, and the holding time of the high temperature area can be extended. Figure 19 is a diagram showing the in-layer temperature (a), the exhaust gas temperature (5), the passing air volume (c), and the exhaust gas composition (d) caused by blowing the diluted C 2 gas when the heat is fixed. Change over time. Here, the inner temperature of the loading layer is the value measured by using the heat transfer device, and the heat transfer device is placed in the upper test pot at a height of 2 mm from the height of the grate (the thickness of the layer is 6 装入). Load at the position of 〇mm). Further, in the circumferential direction of the test pot, measurement was performed at two points of the center portion and the distance wall of .5 mm. According to the above-mentioned figures, it is confirmed that by blowing the diluted propane gas, the melting of the sintering raw material heated to 12051: or more is increased by two times or more (hereinafter referred to as "high temperature region holding time"): but the highest is reached. The temperature did not rise. Further, by blowing the diluted propylene emulsion to lower the oxygen concentration in the exhaust gas, it is presumed that oxygen contributes to an improvement in combustion reaction efficiency. 312/^^0^#(^{φ)/96.〇1/95 J40218 39 1329677 Further, Fig. 20 shows the amount of coke (10% by mass) when propane is diluted (〇·5 vol%) When compared with the time-dependent changes in the temperature (^), (a,) and the exhaust gas concentration (b) ' (b'). According to the drawings, when the proportion of use of the coke powder is multiplied, the holding time of the high temperature region of 12 〇〇eC or more is diluted with the blowing concentration to be 〇. 5 vol% of the propane gas is substantially equal, but the highest reaching temperature exceeds 1 3501. Further, it was confirmed that the concentration of C〇2 in the exhaust gas was greatly increased from 20% by volume to 25% by volume, and the CO concentration was also increased, and the proportion of the coke powder contributing to the combustion was lowered. Fig. 21 is a summary of the results of various characteristic tests in the above test. As can be seen from the figure, the sintering time is extended by the right dryness by blowing the diluted propane gas, but the yield and the fracture strength and productivity are improved, and the reduction pulverization (RDI) and the reducibility are also large. In order to improve, it has been confirmed that by optimizing the blowing of the diluent gas fuel, in addition to improving productivity and yield, the sintered ore can be made of higher quality. On the other hand, in the case where only the coke powder is increased to 1 〇 mass%, the igniting only burns, the '· σ time is prolonged, and the southernmost reaching temperature also rises above the necessary temperature', which generates a large amount of low-intensity amorphous. The bismuth citrate causes a significant decrease in the strength and yield of the fracture. Moreover, in the case of 45 (TC heat preservation furnace, the improvement effect of the crack strength and the yield is small, which is substantially consistent with the results of the commercial equipment hitherto. According to the above description, when the diluted gaseous fuel is used, The gas is burned in the charging layer to expand the combustion zone in the layer, and a wide burning zone is formed by the combustion heat of the sintering raw material t coke and the heat of combustion of the diluted propane gas. , so that the highest combustion reaches the temperature 312 / invention manual (supplement) / 96_〇 1 / 95140218 40 丄: 529677 degrees will not be too high 'and the other side' for the high temperature area to maintain time, due to the combustion of the supplied dilution gas In the second place, the inventors and the like have an effect on the reduction and cold strength of the sintered ore of the finished product against the gas fuel diluted by the inventor, and the conventional method (5 mass%, 10 mass%) The coke and the hot air are compared and investigated. The measured project is the proportion of minerals in the finished sinter (affecting the cold rolling strength, being reduced) 'appearance specific gravity (affecting the cold rolling strength), below 0 5 coffee gas Pore size distribution (affecting the reduction property) First, Fig. 22 shows the results of investigation of the composition ratio of the mineral phase in the finished sintered ore quantification by the powder X-ray diffraction method. According to the figure, when the input heat is fixed (Coke 4% by mass + propane 〇 5 vol%), and when the solid fuel is used in combination with the diluted propane gas, calcium ferrite is stably formed, which is considered to cause an increase in the reductive property and an increase in the chilling strength. The measurement result of the specific gravity of the ore, and the measurement result of the pore diameter distribution of 〇·5 mm or less measured by the mercury intrusion meter is shown in Fig. 23. According to Fig. 22, the self-granulating particles are blown by blowing the diluted propane gas. The outside is heated, and as a result, the flow of the melt is promoted, and the porosity (appearance specific gravity) of 〇5 mm or more is lowered, so that it is considered to be an important cause of the cooling strength of the crucible. Further, according to Fig. 24, it is considered that the heat is input. By blowing the diluted propane gas in a fixed manner, the heat source in the sintered raw material particles can be reduced, so that fine pores of 5 Å or less or less from the ore which are affected by the reducing property are likely to remain. Therefore, the production of the highly reduced sintered ore can be carried out. Fig. 25 is a schematic view showing the sintering operation of (b) when only the coke is used and the diluent gas is blown together (b). Known only 312 / invention specification (supplement) / 96-0 / 95140218 1329677 in the knot, compared to the use of coke powder combustion from the simulation of particles ... in the coke + gas fuel of the present invention combined with the use of gaseous fuel combustion The outside of the simulated particles is added..., so it is easy to leave the fine-rolled holes in the inner ore of the ore, so it can be inferred that the ns-RI can be shifted to a higher position than the low RDI. - Figure 26 shows the blown into the diluted gas. ^ The idea of the stomata of the sinter in the burning of the body. As shown in the figure, in order to improve the production of sinter, it will promote the influence of the yield and the strength of the cold. .5_~5 is reduced with stomata, and several times, and the proportion of pupils above 5 coffees affecting ventilation is increased. It is also known that the ancient Μ, χ. Feng 獒 獒 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 烧结 。 。 。 According to the present invention, it can be considered that by diluting the diluted gaseous fuel, the ', 曰 structure. 』 According to the ideal sinter stomata two tables: grasp the limit coke ratio that can maintain the necessary cold strength (the limit limit The ratio of the ratio of the crushing strength to the coke ratio of the maximum material 7_ when the diluted == is not used. As shown in the S diagram, the dilution is 徭0/, + persimmon. Propane gas (concentration: 0.5 volume = used to obtain the same cold rolling strength as the current situation (the cracking strength (10) of the caribody is as shown in Fig. 27 (4), which can be reduced from 5 mass% to 3 mass% (about, / small As shown in Fig. 27(b) and (c), it can be understood that the households with a productivity of 73% and a productivity of ΐ86 are reduced to 3.5% by mass. The coke-ratio of 4, respectively, from 5 (four) As can be understood from the above description, the present invention relates to the amount of sound that is self-loaded into the layer along with the progress of the combustion and melting zone along with the 312/invention specification (supplement)/96-01/95140218 42 trolley, and appropriately 豨铿4 A _ a During the lower layer, according to the carbon material, the fuel can be supplied at an appropriate position after the fuel is selected, thereby achieving the heart; : The function of combustion and smelting zone function in the layer, which can improve the quality of the ore and improve the productivity. (Example) H 2 1. Perform the sintering pot test. 6 (H 5 body 2 coke oven gas (C gas) as a diluted gaseous fuel 〆i volume is small and the amount of carbon material (coke) in the raw material is set to 5 mass: in the experimental conditions (10) Section 37) is the same. The result is obvious. As shown in the figure, 'When using a rare C gas according to the method of the present invention', if the concentration of the c gas is increased, the width K of the combustion zone is large, and the yield and productivity are high. Increased and the cold strength was improved. (2) Only % Example 2. The test was carried out under the same conditions as in Example 1. The results are shown in ® 29. As shown in the figure, it is known to be used according to the method of the present invention. When the dilute propane gas (〇〇2 to 〇5 vol%) is increased, the concentration of the C gas is increased, the width of the combustion zone is remarkably enlarged, the yield and productivity are improved, and the cold rolling strength (SI) is also improved. (3) Example 3: This example uses the test pot shown in Fig. 6 with and without blowing In the case of the dilution gas, the coke oven gas (C gas) diluted with the cooler exhaust gas was blown from above the pot into the charging layer of the sintering raw material (including 20% by mass of the recovered ore) shown in Table 7. In the embodiment, the sintered layer contains 4.8 mass% to 5. 0 mass% of coke powder (planned number), as a suitable example of the present invention, the concentration is j. 〇 312 / invention specification ( Replenishment)/96-01/95140218 43 1329677 ~2·0% by volume (relative to air) c gas is blown into the surface of the loading layer under the conditions of suction pressure 12〇〇mmAq (differential pressure 1 000 Aq) 1〇〇~400 mm (the whole thickness is 6〇〇mm, the difference thickness is the 200th color of the bottom layer of the recovered layer). Further, regarding the above-described blowing position, when the entire length of the sinter sintering machine is 80 m, if it is applied to the entire height of 6 〇〇 mm, the blowing position of the test No. 2 is 1 〇〇 2 2 mm. , the equivalent of the following example: at a position of 80 (m) xl00 ~ 200 / 600 (mm) = 13. 3 (m) ~ 26. 6 (m), set the length of 13. 3m of the dilution gas into the exhaust The cover 12 is operated by a sintering machine. Therefore, the case where the blowing position of the test No. 2 is 2〇〇~goo mm is equivalent to the following case: • At a position of about 26.7 to 39.7 mm behind the ignition furnace on the sintering machine trolley, the length is still set to 133 ^ The diluent gas is blown into the fume hood 12 to perform gas injection.

312/Invention Manual (supplement) chest 1/95140218 1329677 卜< Bu 33. 76 33. 76 Cv3 οά 1. 52 CS3 od CD S (4.8) C gas <=> 03 300-400 mm Ο 1000 CO 33. 76 CO CO CO 呀οα <ΝΪ 1. 52 oo od O a S (4.8) c gas 〇> csi 200-300 mm <=> 1000 LO CO CO CO CD CO CO 2.24 1 1. 52 <>a od C=5 os (4.8) c gas 〇03 100-200 mm Ο inch 1000 yeah CD CO CO CO CO CO 2.24 1. 52 od os (4.9) c gas 〇f—^ 300-400 mm ο 1000 CO ◦ 卜 co CO <X) CO CO (Nl 〇〇· : 1. 52 oa 卜 CD s (4.9) c gas 〇 200~300 mm CD 〇> ο <=> 03 CO CO CO CO CO CO 03 CO 1. 52 8.72 Q C3 G> CO (4.9) c gas ◦ 100-200 mm ◦ 1000 CO CO CO CD CO CO 2.24 1 οα LO 8.72 | O o (5.0) None (Basic) 1 1 <=> 1000 'No. Conditions'^ Bean stone broken Yandi (-8 mm) Caragas broken Carajas (-8 mm) Shi Xishi (-1 mm) Quicklime limestone (-3 mm) Reclaimed coke (- 3 mm) Injected gas concentration (% by volume, relative to air) Supply position (with surface 0 mm) Layer thickness (mm) Differential pressure (mmAq) ) 备 晚 晚 晚 晚 ( 辑 辑 w w w w w w w w w w w w w w w 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1329677 Table 8 shows the implementation results of this example (NO. 1 ~ NO. 7) According to the results of the implementation, it is judged that the cold rolling strength (SI strength) and the yield of the sintered ore are NO. 2 to NO. 7 which are suitable examples of the present invention are higher than the NO. 1, which is a comparative example. In the case where the blowing position is located in the middle section of the loading layer (NO. 3, 4, 6, 7), the improvement effect is remarkable. It is also known that, compared with the concentration of reducing the amount of charcoal to increase the amount of the blown gas, In addition to the fixed coke amount (4.8% by mass), when the blowing gas concentration is adjusted to 1% by volume, productivity is high. It is also known that, regarding the quality of sintered ore, the most effective method is the following blowing method: it has the same reduction rate (RI) and reduction pulverization rate (RDI), and affects the loading layer of the blowing position of 200 to 300 mm. Middle section.

312/Invention Manual (supplement)/96-01/95H0218 46 Bu C^> f* H Bu· <Τ3 CO 1.84 12.1 1.71 CO CO 03⁄4 CO CO 10.9 Bu D—' | 73.8 I | 75.5 | CO cd 1 ι.6δ 1 1230 η 1270 L〇1320 1 76.6 1 30.0 | 59.6 | LO σί CD 7.24 13.0 1.84 12.1 r-<r-< oo σ> o CNI CO CO czJ to 卜· f—<73.5 L 〇1—< ι 1 Bu 1230 1270 § 1320 ο 77.7 30.9 59.7 LT5 σ> L〇7.04 卜 oi 1.80 11.8 1.67 ΙΛ 03 σ5 s CO 10.4 CO 卜 · | 69.3 1 69.9 14.8 5 1230 1270 LD 1320 g 74.4 29.9 59.7 CT5 oo 7.20 12.7 1.80 11.8 1.67 1 05 CO C<l CO 10.5 CO Bu*' 72.9 r- <J> CO τ*Η 1240 1280 m 1330 g 76.3 32.2 59.6 LTD 03 co 〇o CO 12.7 1.80 11.8 £ cn oo <NI CO 10.3 CO Bu·CO 72.6 CO 1240 1280 § 1330 s inch LO OO 30.8 59.7 10.1 OJ 6.93 12.7 1.80 11.8 1.67 00 01 Additional CO 10.5 ς〇c-_ 70.3 C=> cJ 03 L〇r-H s 1240 1280 LO inch 1330 g oo 31.6 59.0 CO CJ5 CO 12.7 1.80 11. δ 1.68 OO CO oo oa c=! L〇卜* i 68.9 71.2 ' 15.9 1 [1.59 1250 1290 ir> 1360 § 67.4 29.3 59.5 OO ai _______ Implementation No. --. Raw material moisture (%) Loading moisture (wet · kg) Loading wet density (wet · ton/m3) Loading dry weight (dry · kg) | k 8 Pre-ignition wind Pressure (mmifcO) Exhaust gas temperature (°c) Burning amount (kg) Finished product (kg) SI strength (%) Finished product yield (%) 1 Sintering time (minutes) 1 1 •Η ¥ Maximum reaching temperature (°C) High temperature zone hold time (>1200°C) (seconds) 'Maximum reach temperature (°C) High zone hold time (>1200°C) (seconds) Highest to far temperature (°C) High temperature zone hold time (&gt ; 1200 ° C) (seconds) reduction rate (RI) reduction pulverization rate (RDI) T.Fe (%) Fe0 (%) 100~200 C gcc ) 5 <1 CCC ? - result position ^ 81SH s6/s -96/ff}Purple) Helmet Kagl/tNl ε 1329677 (4) Example 4: This example is used to illustrate the application of the sinter manufacturing method of the present invention to a DL type sintering machine of a scale of 10,000 tons per day. An example. The DL used: The length of the machine is from the ignition furnace to the mine discharge. At a position about 3〇1〇 behind the ignition furnace of the sintering machine, a gas blowing hood having a length (tray moving direction) of 15 m and covering the entire width of the machine is provided, and coke oven gas (c gas) is used. ) as a gaseous fuel. = It does not target the upper layer of the raw material of the sintering machine, but is diluted with a normal temperature air to a concentration of 2 at a position equivalent to a distance of 3 〇〇mm from the burning and melting zone. % c gas, the above-mentioned combustion and melting zone is carried out under the condition that the layer thickness is 6 〇〇mm (except for the thickness of the recovered ore), and travels to a surface 200 mm away from the surface layer in the thickness direction of the loading layer. . The blown C gas is adjusted to the above-mentioned position by the sintering layer by adjusting the suction negative pressure of the bellows under the sintering machine trolley, and is burned in the combustion and melting zone. Further, the gas is blown into the fume hood to be slightly positively pressurized by the atmospheric pressure, thereby balancing the suction negative pressure with the bellows. At this time, C • gas usage is 3,000 m3 (standard state) / h. The operation of the sintering machine, as a result, increased the drum strength by about 3% as compared with the usual operation, the RDI was improved by about 3% compared with the usual operation level, and the RI was improved by about 4% compared with the usual - operation. And productivity increased by 03.03 t/hr · y. [Simple description of the drawing] Fig. 1 is an explanatory diagram of the sintering process. Figure 2 is a graph of pressure loss and temperature distribution in a sintered layer. Figure 3 is a graph of temperature distribution at high production and low production. Figure 4 (a), (b), (c) is the temperature distribution and yield distribution in the sintering machine 312 / invention specification (supplement) / 96-01/95140218 48 U29677 figure. Fig. 5 is an explanatory view showing the manufacture of a gaseous fuel blow-in produced by the present invention. Fig. 6 is a transition view (photograph) showing the combustion melting zone in the test pin of the experimental result of the present invention. Figures 7(a) to (d) are comparative charts of the results of the sintering pot test. Fig. 8 is an explanatory diagram of a calculation method of a gas fuel combustion limit. Fig. 9 is an explanatory view showing the temperature dependence of combustion. The figure is a schematic diagram of the influence of the gas type when the gaseous fuel is blown. 11(a) to 11(d) are explanatory views showing the relationship between the concentration of the blown gas and the fracture strength, the yield, the sintering time, and the production. Figure 12 is a schematic illustration of a sintering reaction. Figure 13 is a schematic illustration of the formation process of twin crystalline hematite. Fig. 14 is a view (photograph) of the burning limit when the diluted propane is blown. Fig. 15 is a view showing the influence of the blowing position. Fig. 16 (a) and (b) are views showing the influence of the blowing position. Figure 说明 is an explanatory diagram of the temperature distribution in the layer during sintering. Fig. 18 is an explanatory diagram showing the result of examining the influence of the blowing position. Fig. 19 is a graph showing the change with time of the layer temperature (&), the exhaust gas temperature (b), the passing air volume (c), and the exhaust gas composition (d) when the diluted propane is blown. Fig. 20 is a graph showing the change with time in the temperature (a), (a') and the temperature (b) of the exhaust gas when the amount of the coke is increased during the blowing of the diluted propane. Fig. 21 is a graph showing the results of a test for sintering characteristics under various blowing conditions. Fig. 22 is a graph showing a comparison of changes in the composition ratio of minerals under various blowing conditions. 312/Invention Manual (Supplement)/96-01/95140218 49 1329677 Figure 23 is a graph showing the change in the apparent specific gravity of the finished sintered ore. Figure 2 shows the pore size distribution chart of 〇. 5 mm or less in the finished sinter. Fig. 25 is a view showing the case where only coke is used (a) and when the gas is blown (b). Fig. 26 is a schematic view showing the configuration of the pores when the diluent gas is blown. Fig. 27 (a), (b), and (c) are graphs showing experimental results of the limit coke ratio at which the cold rolling strength can be maintained.

Fig. 28 is a view showing the result (photograph) of Example 1. Fig. 29 is a view showing the result (photograph) of Example 2. [Explanation of main component symbols] 1 Raw material funnel 2 Cylinder mixer 3 Rotary furnace 4 ' 5 Feeding tank 6 Cartridge feeder 7 Cutting trough 8 Pallet 9 Loading layer 10 Ignition furnace 11 Bellows 12 Gas fuel supply device (row Hood) 12a gas injection nozzle 312 / invention manual (supplement) / 96-01/95140218 50

Claims (1)

1 曰拉旮浍 page APR 2 7 2010 Replacement 1329677 ^ 1 10, the scope of application: 1. A method of manufacturing sinter, comprising the following steps: loading step, on the trolley for circulating movement, containing powder The sintering material of the ore and the carbon material is used to form a charging layer containing the carbon material on the trolley; the ignition step is to ignite the carbon material on the surface of the layer in the ignition furnace; the firing step is performed by the wind disposed under the trolley The box attracts air, burns the carbon material in the layer, and generates the sintered 0 piece by using the generated heat of combustion; and the gas fuel burning step, supplies the gas fuel diluted below the lower limit of combustion concentration from above the charged layer The gas fuel is combusted in the charging layer, and the gas fuel burning step includes an operation of supplying a gaseous fuel diluted to a lower concentration of combustion below the self-loading layer to cause the gaseous fuel to burn in the charging layer. And adjusting the highest reaching temperature in the loading layer, the high temperature region holding time in the loading layer, or the highest reaching temperature and temperature in the loading layer Domain hold time. 2. The method for producing a sintered ore according to the first aspect of the invention, wherein the gas fuel burning step comprises the operation of: supplying a gas fuel that is diluted to a lower concentration of a lower combustion limit than a gas layer above the charging layer; Fuel • Burns in the loading zone and adjusts the maximum temperature reached in the loading zone. 3. The method for producing a sintered ore according to the second aspect of the invention, wherein the gas fuel burning step includes the operation of supplying a gaseous fuel diluted to a lower concentration of a lower combustion concentration from above the charging layer, and the gaseous fuel is The inner layer is burned in the layer, and the maximum temperature reached in the layer is adjusted by adjusting the amount of the carbon material in the sintered raw material by adjusting the amount of the carbon material in the sintered raw material. 4. The method for producing a sintered ore according to claim 3, wherein the gas fuel burning step includes an operation of supplying a gaseous fuel diluted to a lower concentration of a lower combustion concentration from above the charging layer to cause the gaseous fuel to be The inside of the layer is burned, and the above-mentioned maximum reaching temperature is adjusted to 1205 ° C to 1 350 ° C by adjusting the amount of the carbon material in the sintering raw material. 5. The method for producing a sintered ore according to the second aspect of the invention, wherein the gas fuel combustion step comprises the operation of supplying a gaseous fuel diluted to a lower concentration of a lower combustion concentration from above the charging layer to cause the gaseous fuel to be The inside of the layer is burned, and the above-mentioned maximum reaching temperature is adjusted to 1205 ° C to 1350 ° C by adjusting the supply amount of the gaseous fuel. 6. The method for producing a sintered ore according to the second aspect of the invention, wherein the gas fuel burning step comprises the operation of supplying a gaseous fuel diluted to a lower concentration of a lower combustion concentration from above the charging layer, and the gaseous fuel is The inner layer is burned in the layer, and the maximum reaching temperature is adjusted to 1205 ° C to 1350 by adjusting the amount of the carbon material of the sintered raw material A and the supply amount of the gaseous fuel. . . 7. The method for producing a sintered ore according to claim 1, wherein the gas fuel burning step includes the operation of supplying a gaseous fuel diluted to a lower limit of combustion concentration or higher from above the charging layer to cause the gaseous fuel to be The inner layer is burned in the layer and the high temperature region within the packed layer is adjusted to maintain time. 8. The method for producing a sintered ore according to claim 7, wherein the gas fuel burning step includes the operation of supplying a gaseous fuel diluted to a lower limit of combustion concentration or higher from above the charging layer to make the gaseous fuel 95140218 52 1329677 - βΗ月/日 1 is burned in the charging layer, and according to the carbon 4 4 of the sintering raw material 4, the concentration of the above gaseous fuel is adjusted, and the temperature in the temperature region of the charging layer is adjusted. 9. The method for producing a sintered ore according to claim 1, wherein the gas fuel burning step comprises the operation of supplying a gaseous fuel diluted to a lower concentration of combustion below the charged layer to be diluted into a combustion. The gaseous fuel below the concentration limit is burned so that at least a portion thereof reaches the combustion and smelting zone in the above-mentioned packed layer while maintaining the state of not being burned. The method for producing a sintered ore according to the first aspect of the invention, wherein the gas fuel burning step comprises the operation of supplying a gaseous fuel diluted to a lower concentration of a lower combustion concentration from above the charging layer to make the gaseous fuel It is burned in the packed layer to adjust the form of combustion and melting zone. 11. The method of producing a sintered ore according to claim 10, wherein the shape of the burning and melting zone is adjusted to adjust the thickness of the zone in the height direction and/or the width of the trolley moving direction. 12. The method for producing a sintered ore according to claim 1, wherein the gas fuel burning step comprises the operation of supplying a gas fuel diluted to a lower concentration of a lower combustion concentration from above the charging layer to make the gas The fuel is burned in the packed bed to prolong the combustion and the high temperature retention of the molten zone to adjust the cold rolling strength of the sintered ore. 13. The method of producing a sintered ore according to claim 1, wherein the gas fuel burning step comprises a squatting operation: supplying a gaseous fuel diluted to a lower concentration of a lower combustion concentration from above the charging layer, so that the gaseous fuel is The method of manufacturing the sintered ore of the first aspect of the present invention, wherein the gas fuel burning step comprises the following actions: : The gaseous fuel diluted to a lower concentration of the lower combustion concentration is supplied above the self-loading layer at a position after the ignition furnace, and the gaseous fuel is burned in the charging layer. 15. The method of manufacturing a sintered ore according to claim 1, wherein the step of burning the gas fuel comprises the following actions: from loading the layer The surface portion is formed into a sintered block until the completion of sintering, and the gaseous fuel is supplied to be diluted to a lower concentration of the lower limit of combustion, and the gaseous fuel is burned in the packed bed. 16. The method for producing a sintered ore according to claim 1, wherein the step of burning the gas fuel comprises the following operation: in a region where the thickness of the combustion and melting π is 15 mm or more, the supply is diluted to a lower concentration of combustion. The gaseous fuel below burns the gaseous fuel in the charging layer. 17. The method of manufacturing a sintered ore according to claim 1, wherein the step of burning the gas fuel comprises the following action: after the front line of the combustion reaches a position of 1 〇〇 mm below the surface layer, the supply is released into a lower combustion concentration. The following gaseous fuel 'burns the above gaseous fuel in the charging layer. 18. The method of manufacturing a sintered ore according to claim 1, wherein the step of burning the gas fuel comprises the step of: supplying a gaseous fuel diluted to a lower concentration of combustion below a lower side wall of the packed layer, The gaseous fuel is burned in the charging layer. 19. The method of manufacturing a sintered ore according to claim 1, wherein the step of burning the gas fuel comprises the following actions: in the length of the sintering machine 95140218 54 IJ29677 |----------direction The gaseous fuel above the self-loading layer 'cools the strength of the gas ore described above. The monthly 'correction replacement page' is supplied with a fuel diluted below the lower combustion limit concentration to be burned in the sintered layer, and the sintering is adjusted as in the case of the patented scope of the sintered bean t, and the gas fuel system is rich in flammable 、', ... Sex 1: It is less than 75% of the lower limit of the combustion concentration. 21. The manufacturing method of the sinter of the ninth patent scope is as follows. The rolling body fuel is diluted to a concentration of 60% or less of the lower limit of combustion and 2% or more of the combustible gas. 22. The method for producing a sintered ore according to the first aspect of the invention, wherein the gas fuel system is diluted to a concentration of 25% or less and 2% or more of the combustible gas. 23. The method of manufacturing a sintered ore according to claim 1, wherein the gaseous fuel is selected from the group consisting of blast furnace gas, coke oven gas, blast furnace and coke oven mixed gas, propane gas, natural gas, and sulphur gas. At least one gas in the group. 24. A sintering machine comprising: a trolley for circulating movement; a raw material supply device for supplying a sintering raw material to a trolley disposed below the trolley; and a point for igniting the carbon material in the sintering raw material The furnace is characterized in that: on the downstream side of the ignition furnace, a gas fuel supply device is disposed for blowing a gas fuel whose concentration has been diluted to a lower concentration of combustion below the self-installation layer to the intrusion layer In the gas fuel supply device, the combustible gas having a concentration diluted to 75% or less and 2% or more of the lower limit of the combustion concentration is supplied. 95140218 55 1329677 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . At least one or more are provided. 26. The sintering machine of claim 24, wherein the gas fuel supply device is disposed in a traveling direction of the bogie at a position from the front of the combustion front to a lower portion of the surface layer until the completion of sintering. 27. The sintering machine of claim 24, wherein the gas #fuel supply device is disposed adjacent to the side wall. The sintering machine according to claim 24, wherein the gas fuel supply device supplies a combustible gas having a concentration diluted to 60% or less and 2% or more of a lower limit of combustion concentration. The sintering machine according to claim 28, wherein the fuel supply device supplies a combustible gas having a concentration diluted to 25% or less and 2% or more of a lower limit of combustion concentration. 95140218 56