TWI687636B - Sinter ore manufacturing method - Google Patents

Abstract

The present invention provides a method for producing a sintered ore that can grasp the change as soon as possible even if the reaction temperature of the sintering changes and suppress equipment troubles. The method for producing sintered ore of the present invention adds water to the sintered raw material blended with iron-containing raw material, CaO-containing raw material and coagulation material for granulation, and sintering with a sintering machine to produce sintered ore, and the method for producing the sintered ore It includes: a measurement step, which continuously measures the component concentration of the sintered ore; and an adjustment step of the speed of the pallet trolley, which uses the component concentration of the sintered ore measured in the measurement step to adjust the traveling speed of the pallet trolley.

Description

Sinter ore manufacturing method

The present invention relates to a method of manufacturing sintered ore. Specifically, the present invention relates to a method of manufacturing sintered ore which measures the component concentration of the sintered ore and uses the component concentration to adjust the traveling speed of the pallet trolley.

In the blast furnace ironmaking method, as the iron source, iron-containing raw materials such as sintered ore lump iron ore, pellets, etc. are mainly used as blast furnace raw materials. Here, the sintered ore is a kind of agglomerate ore obtained by mixing, granulating, and calcining the sintering raw material using a drum mixer to add water while adding water. The particle size of the sintering raw material is 10 mm. CaO-containing raw materials such as limestone or quicklime, steel-making slag, etc., and condensing materials such as coke powder or smokeless charcoal are included in the following iron ore and various iron powder (dust) generated in iron making, as arbitrarily prepared raw materials. Refined nickel slag, dolomite (dolomite), serpentine and other MgO-containing raw materials, and refined nickel slag, silica (silica) and other SiO ₂ containing raw materials.

In recent years, the iron component concentration of the iron ore contained in the raw material of the sintered ore has decreased. Instead, the concentration of gangue components such as SiO ₂ or Al ₂ O _{3 has} increased. Even in the same type of iron ore, the component concentration may sometimes be It is also different in each ship at the time of import, and the component concentration of the produced iron ore becomes unstable.

For the various iron powders produced in iron making, there is a large variation in the amount of production or a variation in the amount of carbon contained. When the variation in the amount of carbon contained in the sintering raw material increases, the reaction temperature for sintering varies.

Variations in the reaction temperature of sintering cause variations in the quality of the finished sintered ore (hereinafter also simply referred to as "sintered ore"), which greatly affects the quality of the sintered ore. For example, in the case of excess heat, the reaction temperature of sintering rises, a glassy low-strength structure is formed in the sintered ore, the magnetite (magnetite) structure increases and the reducibility is reduced, and the quality of the sintered ore decreases. On the other hand, in the case of insufficient heat, the reaction temperature of sintering decreases, which may not cause the sintering reaction originally, and in this case, the sintered ore itself cannot be obtained. Therefore, managing the reaction temperature of sintering is indispensable for maintaining stable sintered ore quality.

However, it is very difficult to continuously measure the reaction temperature of sintering. Therefore, it is common to estimate the reaction temperature of sintering by analyzing the composition of sintered ore, and perform heat management. Specifically, the FeO concentration or the residual C concentration of the sintered ore is measured. In the sintering reaction, the hematite of the sinter ore (hematite) thermally dissociates into magnetite as the temperature rises. As the temperature after the reaction decreases, the magnetite is transformed into hematite again, but the total amount of magnetite not thermally dissociated is restored to hematite, so if the reaction temperature of sintering is high, a large amount of sintered ore Magnetite remains. Magnetite contains divalent Fe, so the FeO concentration of the sintered ore becomes an index indicating the reaction temperature of sintering. The C remaining in the sintered ore indicates that it is not used as a heat source in the sintering reaction. Therefore, when the concentration of C remaining in the sintered ore is high, it is suspected that the amount of heat during the sintering reaction is insufficient.

In the past, the composition of sintered ore and the heat adjustment of the sintering reaction have been adjusted. For example, Patent Document 1 discloses a technique of measuring the FeO concentration of sintered ore and using the FeO concentration of the sintered ore to adjust the coagulated material of the sintered raw material, the granulated moisture, and the amount of exhaust air. In addition, Patent Document 2 discloses a technique of measuring the FeO concentration of sintered ore and using the FeO concentration of the sintered ore to adjust the amount of city gas blown into the sintering machine.

In addition, Patent Document 3 discloses a technique of installing a laser-type component measuring machine on a sintering machine and using the component concentration of the surface layer of the raw material loading layer measured in the pallet using the component measuring machine. The component concentration of the sintered ore is estimated and used to adjust the blending amount of the sintered raw material. [Prior Art Literature] [Patent Literature]

Patent Document 1: Japanese Patent No. 1464203 Patent Document 2: Japanese Patent No. 5544784 Patent Document 3: Japanese Patent Laid-Open No. 60-262926

[Problems to be solved by the invention] The technology disclosed in Patent Document 1 and Patent Document 2 is a technique for measuring the FeO concentration of sintered ore and adjusting the amount of condensed material, granulated moisture, exhaust air volume, and city gas injection volume so as to become a target value. However, it takes time for the composition of the sinter to reflect these adjustment results, and when the reaction temperature of the sinter becomes high, it may cause an abnormal stop of the cooler or a malfunction of equipment downstream of the cooler, etc. Trouble with equipment.

The technique disclosed in Patent Document 3 estimates the component concentration of the sintered ore based on the component concentration of the raw material charging layer surface layer, but the component concentration of the charging layer surface layer varies depending on the charging device of the sintered raw material or the segregation accompanying the particle size of the sintered raw material. Therefore, the relationship between the component concentration of the surface layer of the loaded layer and the component concentration of the sintered ore does not match, and it is difficult to actually estimate the component concentration of the sintered ore based on the component concentration of the surface layer of the loaded layer.

The present invention is made in view of such problems of the prior art, and an object of the present invention is to provide a method for producing sintered ore that can detect the change in the reaction temperature of the sintering and detect the change and suppress the equipment malfunction of the sintered ore manufacturing apparatus. [Means to solve the problem]

The features of the present invention that solve such a problem are as follows. (1) A method for manufacturing sintered ore, adding water to the sintered raw material mixed with iron-containing raw material, CaO-containing raw material and coagulation material for granulation, and sintering with a sintering machine to produce sintered ore, and the sintered ore The manufacturing method includes: a measuring step, which continuously measures the component concentration of the sintered ore; and an adjustment step of the speed of the pallet trolley, which uses the component concentration of the sintered ore measured in the measurement step to adjust the traveling speed of the pallet trolley. (2) The method for producing sintered ore as described in (1), wherein at least one of the MgO-containing raw material and the SiO ₂ -containing raw material is further added to the sintered raw material. (3) The method for producing sintered ore described in (1) or (2), wherein in the measurement step, at least one or more component concentrations of FeO and C of the sintered ore are continuously measured. (4) The method for producing sintered ore as described in any one of (1) to (3), further comprising: a step of adjusting the blending amount, and using the component concentration of the sintered ore to adjust the blending of the sintered raw material coagulation material the amount. (5) The method for producing sintered ore described in any one of (1) to (4), wherein at least one of gas fuel and oxygen is blown into the sintering machine to sinter the sintered raw material, and The method for manufacturing the sintered ore further includes the step of adjusting the blowing amount, and adjusting the blowing amount of at least one of the gas fuel and the oxygen using the component concentration of the sintered ore. [Effect of invention]

By implementing the method for producing sintered ore of the present invention, the component concentration of the sintered ore is continuously measured to change the traveling speed of the sintering machine pallet truck. As a result, the temperature rise of the sintered ore on the outlet side of the cooler can be suppressed, thereby suppressing equipment malfunctions such as equipment failure of the sintering machine.

Hereinafter, the present invention will be described based on the embodiments of the invention. FIG. 1 is a schematic diagram showing an example of a sintered ore production apparatus 10 that can implement the sintered ore production method of the present embodiment. The iron-containing raw material 12 stored in the yard 11 is transferred to the mixing tank 22 by the transfer conveyor 14. The iron-containing raw material 12 includes various kinds of iron ore and iron powder produced in the iron making plant.

The raw material supply unit 20 includes a plurality of mixing tanks 22, 24, 25, 26, and 28. The raw material 12 containing iron is accumulated in the mixing tank 22. CaO-containing raw materials 16 including limestone, quicklime, etc. are stored in the mixing tank 24. MgO-containing raw materials 17 containing dolomite, refined nickel slag, and the like are stored in the mixing tank 25. In the mixing tank 26, a coagulating material 18 is accumulated, and the coagulating material 18 includes coke powder or smokeless charcoal crushed to a particle size of 1 mm or less using a rod mill. In the mixing tank 28, a return ore 74 (sintered ore powder under the sinter ore) with a particle size of 5 mm or less under the sintered ore screen is accumulated. A predetermined amount of each raw material is cut out from the arranging tanks 22, 24, 25, 26, and 28 of the raw material supply unit 20 to be mixed, and a sintered raw material is produced in the conveying conveyor 30. The sintered raw material is transferred to the cylindrical mixer 36 by the transfer conveyor 30. Raw materials containing SiO ₂ can also be blended in the sintered raw materials. In this case, the SiO ₂ -containing raw material can be prepared in the iron-containing raw material 12 stored in the yard 11 for a predetermined amount, or a mixing tank for storing the SiO ₂ -containing raw material can be provided, and the predetermined amount can be cut out from the mixing tank Leveling. The sintered raw material conveyed to the cylindrical mixer 36 is thrown into the cylindrical mixer 36, and an appropriate amount of water 34 is added, for example, to produce quasi-particles having an average particle diameter of 3.0 mm to 6.0 mm. The granulated sintering raw material is transferred to the sintering raw material supply device 42 of the sintering machine 40 by the transfer conveyor 38. The cylinder mixer 36 is an example of a granulation device that granulates sintered raw materials, and a plurality of cylinder mixers 36 may be used, or a pelletizer may be used instead of the cylinder mixer 36. Both the cylindrical mixer 36 and the granulator may be used, and a high-speed mixer may be provided upstream of the cylindrical mixer 36, and the sintered raw material may be stirred before being put into the cylindrical mixer 36. In this embodiment, the average particle size is the arithmetic average particle size, and is Σ(Vi×di) (where Vi is the ratio of particles present in the i-th particle size range, and di is the representative of the i-th particle size range Particle size) as defined by the particle size. In the sintering machine 40, the sintering raw material granulated by the cylindrical mixer 36 is sintered. The sintering machine 40 is, for example, a dwight lioyd sintering machine of the suction type below. The sintering machine 40 includes a sintering raw material supply device 42, a circularly moving pallet trolley 44, an ignition furnace 46, and a wind box 48. The granulated sintered raw material is loaded into the pallet of the pallet trolley 44 from the sintered raw material supply device 42 to form a loaded layer of sintered raw material. The charging layer is ignited by the ignition furnace 46, and the air in the charging layer is sucked downward by the air box 48, thereby moving the combustion and melting belt in the charging layer downward of the charging layer. By this, the loaded layer is sintered to form a sinter cake. When the air in the charging layer is sucked downward by the air box 48, at least one of gas fuel and oxygen may be blown from above the charging layer. The gas fuel is any combustible gas selected from blast furnace gas, coke oven gas, converter gas, city gas, natural gas, methane gas, ethane gas, propane gas, shale gas, and mixed gas of these .

The sinter cake is crushed by the crusher 50 to make sintered ore. The sintered ore crushed by the crusher 50 is cooled by the cooling machine 60. The sintered ore cooled by the cooling machine 60 is sieved by a sieving device 70 having a plurality of sieves, and is sieved into a finished sintered ore 72 having a particle size of more than 5 mm and a return ore 74 having a particle size of less than 5 mm.

The finished sintered ore 72 is transferred to the blast furnace 82 by the transfer conveyor 76. An infrared analyzer 80 is provided on the transport conveyor 76 that transports the finished sintered ore 72. The measurement procedure is performed using the infrared analyzer 80. In the measurement step, the infrared analyzer 80 is used to continuously measure the concentration of at least one or more components of FeO and C in the finished sintered ore 72.

The infrared analyzer 80 irradiates infrared rays with a wavelength in the range of 0.5 μm to 50.0 μm to the finished sintered ore 72 and receives the reflected light from the finished sintered ore 72. The molecular vibration of FeO contained in the finished sintered ore 72 absorbs the natural wavelength component of the irradiated infrared rays, so FeO imparts a natural wavelength component to the reflected infrared rays. The crystal structure of C-like monoatomic molecules also starts to vibrate due to the irradiation of infrared rays, and imparts a specific wavelength component to the reflected infrared rays. Therefore, by analyzing the irradiated infrared rays and reflected infrared rays, the component concentrations of FeO and C in the finished sintered ore 72 can be measured.

The infrared analyzer 80 irradiates infrared rays with a wavelength of 20 or more at a frequency of 128 times a minute, for example, and receives the reflected light reflected by the finished sinter 72. In this way, infrared rays can be irradiated and received in a short time, so the infrared analyzer 80 can continuously measure the component concentration of the finished sintered ore 72 transferred by the transfer conveyor 76 on-line. The infrared analyzer 80 is an example of an analysis device that measures the component concentration of the sintered raw material, and instead of the infrared analyzer 80, a laser analyzer that irradiates the measurement object with a laser, or a neutron analysis that irradiates the measurement object with a neutron Or a microwave analyzer that irradiates microwaves to the measurement object.

The finished sintered ore 72 having a particle diameter of more than 5 mm is transferred to the blast furnace 82 by the transfer conveyor 76, and is loaded into the blast furnace as a blast furnace raw material. On the other hand, the return ore 74 having a particle diameter of 5 mm or less is transported by the transport conveyor 78 to the mixing tank 28 of the raw material supply unit 20.

The finished sintered ore 72 is formed by cooling and sieving the sintered ore crushed by the crusher 50. Therefore, the finished sintered ore 72 and the sintered ore and the returned ore 74 crushed by the crusher 50 are sintered ores of the same composition. Therefore, the infrared analyzer 80 may be provided between the cooler 60 and the screening device 70, or may be provided in the conveying conveyor 78. In the case where the infrared analyzer 80 is provided between the cooler 60 and the screening device 70, the component concentration of the cooled sintered ore is measured in the measurement step. In the case where the infrared analyzer 80 is provided in the transport conveyor 78, the component concentration of the return ore 74 is measured in the measurement step.

In this embodiment, the particle size of the finished sintered ore 72 and the particle size of the returned ore 74 refer to the particle size sieved by a sieve, for example, the so-called particle size exceeding 5 mm refers to sieving using a sieve with a mesh of 5 mm The particle size above the sieve, the so-called particle size below 5 mm, refers to the particle size sieved to below the sieve using a sieve with a mesh of 5 mm. Each value of the particle size of the finished sintered ore 72 and the returned ore 74 is only an example, and is not limited to this value.

The manufacturing method of the sintered ore of this embodiment includes the step of adjusting the speed of the pallet trolley to adjust the traveling speed of the pallet trolley. In the pallet trolley speed adjustment step, for example, the FeO concentration of the finished sintered ore 72 measured in the measurement step is used to adjust the pallet trolley travel speed.

The high FeO concentration of the finished sintered ore 72 indicates that a large amount of magnetite remains in the finished sintered ore 72, and thus it is predicted that the reaction temperature of sintering is high and the sintered cake becomes high temperature. Therefore, even if the sinter cake is pulverized and cooled by the cooling machine 60, the sintered ore cannot be cooled to below the upper limit temperature on the outlet side of the cooling machine 60, which may cause the cooling machine 60 to stop abnormally or more than the cooling machine 60 Equipment failures such as failure of equipment on the downstream side.

Therefore, the relationship between the FeO concentration of the sintered ore and the temperature of the sintered ore of the sintered ore at the exit side of the cooler 60 is grasped in advance for each traveling speed of the pallet truck, and the management of the FeO concentration that exceeds the upper limit temperature of the exit of the cooler 60 is set in advance value. In the adjustment step of the pallet trolley, when the FeO concentration of the finished sinter 72 is further increased than the management value, it is adjusted when it is predicted that the sinter temperature at the outlet side of the cooler 60 calculated according to the corresponding relationship exceeds the upper limit temperature The traveling speed of the pallet trolley slows down the traveling speed of the pallet trolley. If the traveling speed of the pallet truck is slowed, the time for cooling by the cooling machine 60 becomes longer, so the temperature of the sintered ore on the outlet side of the cooling machine 60 becomes lower. In this way, the temperature of the sintered ore on the outlet side of the cooler 60 can be lowered, so that abnormal stop of the cooler 60 or failure of equipment on the downstream side of the cooler 60 can be suppressed.

In the above example, it is shown that the FeO concentration of the finished sintered ore 72 is continuously measured in the measurement step. The FeO concentration of the finished sintered ore 72 is further increased than the management value. The output side of the cooler 60 calculated based on the corresponding relationship In the case where the sinter temperature exceeds the upper limit temperature, an example of adjusting the traveling speed of the pallet trolley is used. However, in the measurement step, the C concentration of the finished sinter 72 may be measured instead of the FeO concentration. The relationship between the C concentration of the sintered ore and the temperature of the sintered ore on the outlet side of the cooler 60 is grasped in advance, and the management value of the C concentration that exceeds the upper limit temperature on the outlet side of the cooler 60 is set in advance, when the C concentration further rises from the management value At this time, the traveling speed of the pallet trolley is slowed down. This means that the temperature in the width direction of the sintering machine becomes non-uniform and C is not combusted, so that the C concentration becomes high, and the uncalcined sintered ore is discharged. Therefore, slowing down the traveling speed of the pallet trolley to completely burn C on the sintering machine can suppress the abnormal stop of the cooling machine 60 caused by the combustion of C in the cooling machine 60, or the downstream of the cooling machine 60 The generation of equipment obstacles caused by C burning in the equipment.

The method for producing sintered ore of this embodiment may further include an adjustment step of the blending amount, and the concentration of at least one or more components of FeO and C of the finished sintered ore 72 measured in the measurement step may be used to adjust the sintered raw material coagulation material. The amount of deployment. For example, even when the FeO concentration of the finished sintered ore 72 is higher than the management value and the sintering reaction temperature is predicted to be high, the amount of coagulation material can be reduced through the adjustment step of the amount of adjustment, thereby reducing the sintering reaction temperature. After lowering the reaction temperature of sintering, the traveling speed of the pallet trolley slowed down in the adjustment step of the pallet trolley speed can be recovered, so the productivity of the sintered ore caused by slowing down the traveling speed of the pallet trolley can be suppressed Reduction. As long as the variation of the reaction temperature of sintering can be suppressed by adjusting the amount of coagulation material, the variation of the FeO concentration of the sintered ore is suppressed, and the quality of the sintered ore becomes higher.

The method for producing a sintered ore of this embodiment may include a step of adjusting the blowing amount, and adjust at least one of gaseous fuel and oxygen using at least one or more component concentrations of FeO and C of the sintered ore measured in the measurement step. The blowing volume. For example, even if the FeO concentration of the sintered ore is further increased than the management value and it is predicted that the sintering reaction temperature is high, the injection amount of at least one of gaseous fuel and oxygen can be reduced by the adjustment step of the injection amount, This shortens the high-temperature retention time of the sintering reaction temperature. After shortening the high-temperature holding time of the reaction temperature of the sintering, the traveling speed of the pallet trolley, which was slowed down in the adjustment step of the pallet trolley speed, can be recovered, so that the production caused by slowing down the traveling speed of the pallet trolley can be suppressed Sexual decline. As long as the reaction temperature fluctuation of sintering can be suppressed by adjusting the injection amount of at least one of gas combustion and oxygen, the fluctuation of the FeO concentration of the sintered ore is also suppressed, and the quality of the sintered ore also becomes higher.

In this embodiment, each raw material is cut out from the mixing tanks 22, 24, 25, 26, and 28 of the raw material supply unit 20 to be mixed, and the sintered raw material is made in the conveying conveyor 30, and is made in the cylindrical mixer 36. Examples of granulated sintered raw materials are not limited thereto. For example, the sintered raw materials mixed with the iron-containing raw materials 12, the CaO-containing raw materials 16, the MgO-containing raw materials 17 and the ore-returning 74 may be put into the cylindrical mixer 36, and water may be added to the sintered raw materials for granulation. In the second half of the time, the coagulating material 18 is put in, and thus the carbon material exterior particles in which the coagulating material 18 exists in the surface layer are used as granulated sintering raw materials.

A part of the sintered raw material mixed with the iron-containing raw material 12, the CaO-containing raw material 16, the MgO-containing raw material 17 and the ore-recovering 74, and the coagulated material 18 may also be put into the cylindrical mixer 36, and water may be added to the sintered raw material In the granulation, the remaining part of the coagulating material 18 is put in the second half of the granulation, thereby using the carbon material exterior particles that have the coagulating material 18 on the surface layer of the granulated sintered raw material as the granulated sintered raw material. As a coagulation material to which water is added to the sintering raw material and is formulated in the second half of granulation, coke powder or smokeless charcoal is used.

When a plurality of cylindrical mixers 36 are provided and the carbon exterior particles that allow the coagulating material 18 to be present on the surface layer are used, a part or all of the coagulating material 18 may be thrown into the final cylindrical mixer 36 In the second half, the sintered raw material is put into the cylindrical mixer 36 by the method described above, thereby producing carbon material exterior particles in which the coagulating material 18 is present on the surface layer. Furthermore, regarding the water added to the sintering raw material when a plurality of cylindrical mixers 36 are used, all water can be added to the first cylindrical mixer 36 or can be added to the first cylindrical mixer 36 A part of water is added, and the remaining part is added to the other cylinder mixer 36.

In the present embodiment, each raw material is cut out from the preparation tanks 22, 24, 25, 26, and 28 of the raw material supply unit 20 to be prepared, and a sintered raw material is made in the conveying conveyor 30, and is made in the cylindrical mixer 36. Examples of making granulated sintered raw materials are not limited thereto. For example, the sintered raw material mixed with the iron-containing raw material 12, the MgO-containing raw material 17 and the returned ore 74 may be put into the cylindrical mixer 36, and water may be added to the sintered raw material for granulation. The CaO raw material 16 and the coagulating material 18 are used as granulated sintering raw materials by using the granulated particles in which the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer.

It is also possible to put a part of the sintered raw material mixed with the iron-containing raw material 12, the MgO-containing raw material 17 and the returned ore 74, and the condensed material 18 into the cylindrical mixer 36, add water to the sintered raw material for granulation, and then granulate The remaining part of the iron-containing raw material 12 and the CaO-containing raw material 16 are added in the second half of the time, thereby using the granulated particles in which the iron-containing raw material 12 and the CaO-containing raw material 16 are present in the surface layer as the granulated sintered raw material.

A part of the sintered raw materials mixed with the iron-containing raw material 12, the returned ore 74, the MgO-containing raw material 17, and the CaO-containing raw material 16 can also be put into the cylindrical mixer 36, and water can be added to the sintered raw material for granulation. In the second half of granulation, the remaining portion of the CaO-containing raw material 16 and the coagulating material 18 are prepared, and thus the granulated particles in which the CaO-containing raw material 16 and the coagulating material 18 are present on the surface layer are used as granulated sintered raw materials.

The sintered raw material mixed with the iron-containing raw material 12, the returned ore 74 and the MgO-containing raw material 17, part of the CaO-containing raw material 16 and part of the condensed material 18 can also be put into the cylindrical mixer 36 to add water to the sintered raw material Granulation is carried out, and the remaining part of the CaO-containing raw material 16 and the remaining part of the coagulating material 18 are prepared in the second half of the granulation, thereby using the granulated particles in which the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer as granulated Sintered raw materials.

In the case of using a plurality of cylindrical mixers 36 and producing granulated particles in which CaO-containing raw material 16 or CaO-containing raw material 16 and coagulating material 18 are present in the surface layer, part or all of CaO-containing raw material 16 and coagulating The material 18 is thrown into the second half of the last cylindrical mixer 36, and the sintered raw material is thrown into the cylindrical mixer 36 by the method described above, thereby manufacturing the CaO-containing raw material 16 and the coagulating material 18 in the surface layer Granulated particles.

In the present embodiment, an example is shown in which each raw material is cut out from the preparation grooves 22, 24, 25, 26, and 28 of the raw material supply unit 20 and prepared, and the sintered raw material is produced in the conveying conveyor 30, but it is not limited thereto. For example, a part of each raw material cut out from the mixing tanks 22, 24, 25, 26, and 28 of the raw material supply unit 20 may be directly transferred to the cylindrical mixer 36 by the transfer conveyor 30, and the transfer conveyor 30 may be used. Different conveying conveyors transfer the remaining part to a high-speed stirring device for agitation, and then granulate it with a granulator such as a cylindrical mixer 36 or a granulator. If necessary, use a dryer to dry and then put it into the conveying conveyor. 30 or in the conveyor 38. The granulation machine such as the cylindrical mixer 36 or the granulation machine may be used to directly granulate the conveying conveyor 30 after agitation. Furthermore, at least one of the crushing step and the sieve step may be provided before the stirring treatment by the high-speed stirring device. When a plurality of cylindrical mixers 36 are used, they may be put into any conveyor between the cylindrical mixers.

Furthermore, the infrared analyzer 80 in the measurement step is not limited to one, and may be provided in plurality. A plurality of infrared analyzers 80 may be used to measure the concentration of at least one component of FeO and C in the sintered ore. [Example]

In the examples and comparative examples, the sintered ore production apparatus 10 shown in FIG. 1 was used to produce sintered ore. In the examples and comparative examples, an infrared analyzer 80 was installed in the conveying conveyor 76, and the FeO concentration was continuously measured as the component concentration of the sintered ore at a frequency of 18 times per hour, and the FeO concentration of the sintered ore was used to determine the FeO concentration of the sintered ore The sintered ore was produced for 5 hours by adjusting the blending rate of the coke powder as the coagulation material so as to be the FeO management value. In both the examples and the comparative examples, after 1 hour passed, it was changed to a raw material pile containing iron powder having a high C concentration.

The embodiment is an example that includes an adjustment step of the pallet speed that adjusts the traveling speed of the sintering machine pallet, and the comparative example is an example that does not include the adjustment step of the pallet speed. Therefore, when the FeO concentration of the sintered ore becomes high, the traveling speed of the pallet trolley is slowed down in the examples and the ratio of coke powder is adjusted to cope with it. In the comparative example, the traveling speed of the pallet trolley is not adjusted. Adjust the ratio of coke powder.

2 is a graph showing the FeO concentration (mass %) of the sintered ore, the traveling speed of the pallet trolley (m/min), the ratio of coke powder (mass %) and the temperature of the sintered ore on the outlet side of the cooler (°C) ) A graph of time changes. Fig. 3 shows the FeO concentration (mass %) of the sintered ore in the comparative example, the traveling speed of the pallet trolley (m/min), the blending rate of coke powder (mass %), and the temperature of the sintered ore on the outlet side of the cooler (°C ) A graph of time changes.

Since the infrared analyzer 80 continuously measures the FeO concentration of the sintered ore, it is possible to detect that the FeO concentration of the sintered ore increases further than the FeO management value as soon as the raw material stack is changed. Since it was detected that the reaction temperature of sintering increased due to the increase in FeO concentration, the temperature of the sintered ore on the outlet side of the cooler exceeded the upper limit temperature, so in the embodiment, the sintering machine pallet truck was slowed down in the adjustment step of the pallet truck speed And adjust the coke powder blending rate. As a result, the increase in the temperature of the sintered ore on the outlet side of the cooler is suppressed, and the operation can be performed without exceeding the upper limit temperature on the outlet side of the cooler. By adjusting the blending rate of coke powder and returning the FeO concentration to the management value, the traveling speed of the pallet trolley is restored to the original speed. This can also suppress the decrease in the productivity of the sintered ore.

In this way, in the method for producing sintered ore of the present embodiment, the FeO concentration of the sintered ore is continuously measured, and the traveling speed of the sintering machine pallet truck is adjusted at the time when the rise of the FeO concentration of the sintered ore is detected. From this, it was confirmed that the increase in the temperature of the sintered ore on the outlet side of the cooler can be suppressed, the load on the cooler or the equipment behind it can be reduced, and device failures such as equipment failure can be avoided.

In the comparative example, it was also detected that the temperature of the sintered ore on the cooler outlet side exceeded the upper limit temperature due to the increase in the FeO concentration of the sintered ore, so the adjustment of the ratio of coke powder was adjusted. However, the temperature reduction of the sinter ore on the outlet side of the cooler is after adjusting the blending rate of the coke powder, and after the raw materials charged into the sinterer are replaced for about 30 minutes, before the temperature of the sinter ore exceeds The upper limit temperature on the outlet side of the cooler rises, and as a result, the cooler stops abnormally. After the cooling machine and the pallet trolley are stopped, the temperature of the sintering machine is lowered, so the sintering raw material coke powder blending rate is increased, and the production of sintered ore is restarted while the traveling speed of the pallet trolley is slowed down.

In both the examples and the comparative examples, the increase in the FeO concentration of the sintered ore was detected, and at the time when the temperature of the sintered ore on the outlet side of the cooler was detected to exceed the upper limit temperature, the concentration of C derived from the increase in the reaction temperature of the sintering was increased. The sintered raw materials of the raw material pile of iron powder are loaded into the pallet of the pallet trolley of the sintering machine. In the comparative example, the blending rate of the coke powder was adjusted, but the adjustment reflecting the blending rate was started from the sintered raw material cut and prepared from the raw material supply section, and it was not reflected in the sintered raw material already loaded into the pallet in. Therefore, in the comparative example, the temperature of the sintered ore increases due to the increase in the reaction temperature of sintering, and the temperature of the sintered ore exceeds the upper limit temperature on the outlet side of the cooler. As a result, the equipment malfunctions such as abnormal stopping of the cooling machine.

In the embodiment, the increase in the FeO concentration of the sintered ore is detected, and when the temperature of the sintered ore on the outlet side of the cooler is detected to exceed the upper limit temperature, the traveling speed of the pallet trolley is slowed down in the adjustment step of the pallet trolley speed . As a result, the time for cooling by the cooler can be extended from the sintered raw material loaded into the pallet. Therefore, even if the reaction temperature of sintering of the sintered raw material increases, the temperature increase of the sintered ore on the outlet side of the cooler can be suppressed In this way, it is possible to suppress obstacles such as abnormal stop of the cooler or equipment failure. In this embodiment, the example in which the measurement frequency of the infrared analyzer 80 installed in the conveying conveyor 76 is set to 18 times per hour is shown. However, even if the measurement frequency is lower than this, the adjustment pallet trolley can be obtained. The effect of speed. The measurement frequency only needs to be set once or more within about 30 minutes required for the raw materials loaded into the sintering machine to be replaced.

In this way, in the method for producing sintered ore of the present embodiment, by continuously measuring the FeO concentration of the sintered ore in the measurement step, an increase in the sintering reaction temperature is detected as early as possible, and the pallet trolley is slowed down in the adjustment step of the pallet trolley speed Speed of travel. From this, it was confirmed that, for example, even when the reaction temperature of sintering is changed due to the change to a raw material pile containing iron powder with a high C concentration, the temperature increase of the sintered ore on the outlet side of the cooler can be suppressed, thereby suppressing the cooler Equipment failures such as abnormal stopping or equipment failure of the sintering machine.

10‧‧‧Sinter ore manufacturing equipment 11‧‧‧ Yard 12‧‧‧ Iron-containing raw materials 14, 30, 38, 76, 78‧‧‧‧ conveyor 16‧‧‧CaO-containing raw materials 17‧‧‧MgO-containing raw materials 18‧‧‧Condensation material 20‧‧‧ Raw Material Supply Department 22, 24, 25, 26, 28 34‧‧‧ water 36‧‧‧Cylinder mixer 40‧‧‧sintering machine 42‧‧‧Sintering raw material supply device 44‧‧‧pallet trolley 46‧‧‧Ignition furnace 48‧‧‧bellows 50‧‧‧Crusher 60‧‧‧cooler 70‧‧‧ Screening device 72‧‧‧Finished Sinter 74‧‧‧return to mine 80‧‧‧Infrared Analyzer 82‧‧‧blast furnace

FIG. 1 is a schematic diagram showing an example of a sintered ore production apparatus 10 that can implement the sintered ore production method of the present embodiment. FIG. 2 is a graph showing the time variation of the FeO concentration of the sintered ore, the traveling speed of the pallet trolley, the blending rate of coke powder, and the temperature of the sintered ore on the outlet side of the cooler. FIG. 3 is a graph showing the time change of the FeO concentration of the sintered ore of the comparative example, the traveling speed of the pallet trolley, the blending rate of coke powder, and the temperature of the sintered ore on the outlet side of the cooler.

10‧‧‧Sinter ore manufacturing equipment

11‧‧‧ Yard

12‧‧‧ Iron-containing raw materials

14, 30, 38, 76, 78‧‧‧‧ conveyor

16‧‧‧CaO-containing raw materials

17‧‧‧MgO-containing raw materials

18‧‧‧Condensation material

20‧‧‧ Raw Material Supply Department

22, 24, 25, 26, 28

34‧‧‧Water

36‧‧‧Cylinder mixer

40‧‧‧sintering machine

42‧‧‧Sintering raw material supply device

44‧‧‧pallet trolley

46‧‧‧Ignition furnace

48‧‧‧bellows

50‧‧‧Crusher

60‧‧‧cooler

70‧‧‧ Screening device

72‧‧‧Finished Sinter

74‧‧‧return to mine

80‧‧‧Infrared Analyzer

82‧‧‧blast furnace

Claims (9)

A method for manufacturing sintered ore. Water is added to sintered raw materials prepared with iron-containing raw materials, CaO-containing raw materials and condensed materials for granulation, and sintered by a sintering machine to produce sintered ore. The method for manufacturing sintered ore includes : Measuring step, continuously measuring the component concentration of the sintered ore; and adjusting step of the speed of the pallet trolley, using the component concentration of the sintered ore measured in the measuring step to adjust the traveling speed of the pallet trolley. The method for producing sintered ore as described in item 1 of the scope of the patent application, wherein at least one of the MgO-containing raw material and the SiO ₂ -containing raw material is further added to the sintered raw material. The method for producing a sintered ore according to claim 1 or claim 2, wherein in the measurement step, the concentration of at least one or more components of FeO and C in the sintered ore is continuously measured. The method for manufacturing sintered ore as described in item 1 or 2 of the scope of the patent application further includes: a step of adjusting the blending amount, and using the component concentration of the sintering ore to adjust the blending amount of the sintered raw material coagulation material. The method for manufacturing sintered ore as described in item 3 of the scope of the patent application further includes: a step of adjusting the blending amount, using the component concentration of the sintering ore to adjust the blending amount of the sintered raw material coagulation material. The method for producing sintered ore according to item 1 or 2 of the patent application scope, wherein at least one of gas fuel and oxygen is blown into the sintering machine to sinter the sintered raw material, and The method for manufacturing the sintered ore further includes the step of adjusting the blowing amount, and adjusting the blowing amount of at least one of the gas fuel and the oxygen using the component concentration of the sintered ore. The method for manufacturing sintered ore as described in item 3 of the patent application scope, wherein at least one of gas fuel and oxygen is blown into the sintering machine to sinter the sintered raw material, and the method for manufacturing the sintered ore It includes the step of adjusting the blowing amount, and adjusting the blowing amount of at least one of the gas fuel and the oxygen using the component concentration of the sintered ore. The method for producing sintered ore as described in item 4 of the patent application scope, wherein at least one of gas fuel and oxygen is blown into the sintering machine to sinter the sintered raw material, and the method for producing the sintered ore It includes the step of adjusting the blowing amount, and adjusting the blowing amount of at least one of the gas fuel and the oxygen using the component concentration of the sintered ore. The method for producing sintered ore as described in item 5 of the patent application scope, wherein at least one of gas fuel and oxygen is blown into the sintering machine to sinter the sintered raw material, and the method for producing the sintered ore It includes the step of adjusting the blowing amount, and adjusting the blowing amount of at least one of the gas fuel and the oxygen using the component concentration of the sintered ore.

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