TW201923299A - Sintered ore manufacturing method - Google Patents

Abstract

The purpose of the present invention is to provide a sintered ore manufacturing method which, even when reaction temperature fluctuates during sintering, enables such a fluctuation to be discerned immediately and makes it possible to minimize equipment trouble. This method is for manufacturing a sintered ore by pelletizing, through addition of water, a sintering material which is a mixture of an iron-containing raw material, a CaO-containing raw material, and a setting material, and by sintering the pellets using a sintering machine, the method comprising: a measurement step for continuously measuring a constituent concentration in the sintered ore; and a pallet truck speed adjustment step for adjusting the traveling speed of a pallet truck using the sintered ore constituent concentration measured in the measurement step.

Description

Manufacturing method of sintered ore

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

In the blast furnace iron making method, as an iron source, iron-containing raw materials such as sintered ore, lump iron ore, and pellets are mainly used as blast furnace raw materials. Here, the sintered ore is a type of agglomerated ore that is mixed, granulated, and calcined by adding water to the sintering raw material by using a drum mixer. The sintering raw material has a particle diameter of 10 mm. In the following iron ore and various iron sources such as iron powder (dust) produced in iron production, limestone or quicklime, steelmaking slag and other CaO-containing raw materials, coke powder or anthracite, and other condensed materials are blended. Refined nickel-containing slag, 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 sinter raw material, which is the raw material of the sintered ore, has been reduced. Instead, the concentration of gangue components such as SiO ₂ or Al ₂ O _{3 has} increased. It is also different in each ship at the time of import, and the component concentration of the produced iron ore becomes unstable.

For various iron powders produced in ironmaking, the amount of variation or the amount of change in the carbon content is large. When the variation in the amount of carbon contained in the sintering raw material increases, the sintering reaction temperature varies.

Fluctuations in the reaction temperature of the sintering cause changes in the quality of the finished sintered ore (hereinafter also simply referred to as "sintered ore") as a finished product, which greatly affects the quality of the sintered ore. For example, when the amount of heat is excessive, the reaction temperature of sintering rises, a low-strength glassy structure is formed in the sintered ore, and the magnetite (magnetite) structure is increased to reduce the reduction property, and the quality of the sintered ore is reduced. On the other hand, in the case of insufficient heat, the sintering reaction temperature is lowered, and the sintering reaction may not be caused originally, and in this case, the sintered ore itself cannot be obtained. Therefore, managing the reaction temperature of sintering is indispensable for maintaining stable sinter ore quality.

However, it is very difficult to continuously measure the reaction temperature for sintering. Therefore, the sintering reaction temperature is generally estimated by analyzing the components of the sintered ore, and heat management is performed. Specifically, the FeO concentration or residual C concentration of the sintered ore is measured. In the sintering reaction, the hematite of the sintered ore is thermally dissociated into magnetite as the temperature rises. As the temperature decreases after the reaction, the magnetite is changed from hematite to hematite again, but the total amount of magnetite that is not thermally dissociated is restored to hematite. Therefore, if the reaction temperature of sintering is high, a large amount of sintered ore Residual magnetite. 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 was 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 heat during the sintering reaction is insufficient.

The measurement of the composition of the sintered ore and the heat adjustment of the sintering reaction have been performed previously. For example, Patent Document 1 discloses a technique for measuring the FeO concentration of a sintered ore, and using the FeO concentration of the sintered ore to adjust the coagulation material, the granulated moisture, and the amount of exhaust air of the sintering raw material. In addition, Patent Document 2 discloses a technique for measuring the FeO concentration of a 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 in which a laser-type component measuring machine is installed on a sintering machine, and the component concentration of the surface layer of the raw material charging layer loaded into the pallet is measured by using the component measuring machine. The component concentration of the sintered ore is estimated, and the blended amount of the sintered raw material is adjusted using this.
[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 techniques disclosed in Patent Documents 1 and 2 are techniques for measuring the FeO concentration of a sintered ore, and adjusting the amount of condensed material, the amount of granulated water, the amount of exhaust air, and the amount of urban gas blown in such a way as to become target values. However, it takes time for the composition of the sintered ore to reflect the results of these adjustments. When the reaction temperature of the sintering becomes high, the cooler may stop abnormally or the equipment on the downstream side of the cooler may malfunction. Equipment trouble.

The technique disclosed in Patent Document 3 estimates the component concentration of the sintered ore from the component concentration of the surface layer of the raw material charging layer, but the component concentration of the surface layer of the charging layer varies depending on the loading device of the sintering material or the segregation of the particle size of the sintering material. Therefore, the relationship between the component concentration of the surface layer and the component concentration of the sintered ore is inconsistent, 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 charged layer.

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

The features of the present invention that solve such problems are as follows.
(1) A method for manufacturing a sintered ore, adding water to a sintered raw material prepared by mixing an iron-containing raw material, a CaO-containing raw material, and a coagulation material, and granulating the sintered raw material by using a sintering machine, and The manufacturing method includes a measurement step of continuously measuring the component concentration of the sintered ore; and an adjustment step of the speed of the pallet truck, using the component concentration of the sintered ore measured in the measurement step to adjust the traveling speed of the pallet truck.
(2) The method for producing a sintered ore according to (1), wherein at least one of a MgO-containing raw material and a SiO ₂ -containing raw material is further prepared in the sintering raw material.
(3) The method for producing a sintered ore according to (1) or (2), wherein in the measurement step, the concentration of at least one component of FeO and C of the sintered ore is continuously measured.
(4) The method for producing a sintered ore according to any one of (1) to (3), further comprising: a step of adjusting a blending amount, using the component concentration of the sintered ore to adjust the formulation of the coagulation material of the sintering raw material the amount.
(5) The method for producing a sintered ore according to any one of (1) to (4), wherein the sintering machine blows at least one of a gas fuel and oxygen to sinter a sintering raw material, and The method for manufacturing a sintered ore further includes a step of adjusting a blowing amount, and adjusting a blowing amount of at least one of the gaseous fuel and the oxygen using a component concentration of the sintered ore.
[Effect of the invention]

By implementing the sintered ore manufacturing method of the present invention, the component concentration of the sintered ore is continuously measured, and the traveling speed of the pallet of the sintering machine is changed. Thereby, the temperature rise of the sinter ore on the outlet side of the cooler can be suppressed, and equipment obstacles such as equipment failure of the sinter machine can be suppressed.

Hereinafter, the present invention will be described based on embodiments of the invention. FIG. 1 is a schematic diagram showing an example of a sintered ore manufacturing apparatus 10 that can implement the method for manufacturing a sintered ore of the present embodiment. The iron-containing raw material 12 stored in the yard 11 is transferred to the preparation 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. An iron-containing raw material 12 is accumulated in the preparation tank 22. A CaO-containing raw material 16 containing limestone, quicklime, or the like is accumulated in the preparation tank 24. An MgO-containing raw material 17 including dolomite, refined nickel slag, and the like is accumulated in the preparation tank 25. A coagulation material 18 is accumulated in the preparation tank 26, and the coagulation material 18 includes coke powder or anthracite which is crushed to a particle diameter of 1 mm or less with a rod mill. In the blending tank 28, a return ore 74 (under the sintered ore powder) having a particle diameter of 5 mm or less under the sintered ore sieve is accumulated. A predetermined amount of each raw material is cut out from the compounding tanks 22, 24, 25, 26, and 28 of the raw material supply unit 20 to be blended, and a sintered raw material is prepared on the transfer conveyor 30. The sintering raw material is transferred to the cylindrical mixer 36 by the transfer conveyor 30. The sintering raw material may be blended with a SiO ₂ -containing raw material. In this case, the SiO ₂ -containing raw material can be prepared in the iron-containing raw material 12 stored in the storage yard 11, or a mixing tank for storing the SiO ₂ -containing raw material can be separately provided, and the predetermined amount can be cut out from the mixing tank. Deployment.
The sintered raw material conveyed to the cylindrical mixer 36 is put into the cylindrical mixer 36, and an appropriate amount of water 34 is added to produce, for example, quasi particles having an average particle diameter of 3.0 mm to 6.0 mm. The granulated sintering raw material is a sintering raw material supply device 42 that is transferred from the transfer conveyor 38 to the sintering machine 40. The cylindrical mixer 36 is an example of a granulating device for granulating a sintered raw material. A plurality of cylindrical mixers 36 may be used, or a pelletizer may be used instead of the cylindrical mixer 36. Both the cylindrical mixer 36 and the granulator may be used, and a high-speed mixer may be installed upstream of the cylindrical mixer 36 to stir the sintering raw material before putting it into the cylindrical mixer 36. In this embodiment, the average particle diameter is an arithmetic average particle diameter, and is Σ (Vi × di) (where Vi is the existence ratio of particles existing in the i-th particle size range, and di is a representative of the i-th particle size range. 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 downward suction type dwight lioyd sintering machine. The sintering machine 40 includes a sintering raw material supply device 42, a ring-shaped pallet tray 44 that moves in a circular motion, an ignition furnace 46, and a wind box 48. The granulated sintered raw material is loaded from the sintered raw material supply device 42 into the pallet of the pallet trolley 44 to form a charging layer for the sintered raw material. The loading layer is ignited by the ignition furnace 46, and the air in the loading layer is sucked downward by the bellows 48, so that the combustion and melting bands in the loading layer are moved below the loading layer. Thereby, the encapsulation layer is sintered to form a sintered cake. When the air contained in the layer is sucked downward by the bellows 48, at least one of gaseous fuel and oxygen may be blown from above the layer. The gas fuel is any flammable gas selected from the group consisting of blast furnace gas, coke oven gas, converter gas, city gas, natural gas, methane gas, ethane gas, propane gas, shale gas, and a mixture of these gases. .

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

The finished sinter 72 is transferred to the blast furnace 82 by a transfer conveyor 76. A transfer conveyor 76 that transports the finished sinter 72 is provided with an infrared analyzer 80. The measurement procedure is performed using the infrared analyzer 80. In the measurement step, an infrared analyzer 80 is used to continuously measure at least one component concentration of FeO and C in the finished sinter 72.

The infrared analyzer 80 irradiates the finished sintered ore 72 with infrared rays having a wavelength in a range of 0.5 μm to 50.0 μm, and receives reflected light from the finished sintered ore 72. The molecular vibration of FeO contained in the finished sintered ore 72 absorbs the intrinsic wavelength component of the irradiated infrared rays, and therefore FeO imparts the intrinsic wavelength component to the reflected infrared rays. The crystal structure of a C-like monoatomic molecule also starts to vibrate due to the irradiation of infrared rays, and an intrinsic wavelength component is given 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 sinter 72 can be measured.

The infrared analyzer 80 radiates infrared light having a wavelength of 20 or more at a frequency of 128 times a minute, for example, and receives 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 for measuring the component concentration of a sintering raw material. Instead of the infrared analyzer 80, a laser analyzer that irradiates a laser beam to a measurement target and a neutron analysis that radiates neutrons to the measurement target may be used. Or a microwave analyzer that irradiates microwaves to a measurement object.

The finished sintered ore 72 having a particle size exceeding 5 mm is transferred to the blast furnace 82 by a transfer conveyor 76, and is charged into the blast furnace as a blast furnace raw material. On the other hand, the return ore 74 with a particle diameter of 5 mm or less is transferred to the preparation tank 28 of the raw material supply unit 20 by the transfer conveyor 78.

The finished sintered ore 72 is obtained by cooling and sieving the sintered ore crushed by the crusher 50. Therefore, the finished sintered ore 72 and the sintered ore crushed by the crusher 50 and the returned ore 74 are sintered ore with the same composition concentration. Therefore, the infrared analyzer 80 may be provided between the cooler 60 and the screening device 70, and may also be provided in the transfer conveyor 78. When an infrared analyzer 80 is provided between the cooler 60 and the screening device 70, the component concentration of the sintered ore after cooling is measured in a measurement step. When the infrared analyzer 80 is provided in the conveyance conveyor 78, the component concentration of the returned mine 74 is measured in a measurement process.

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 that is sieved by a sieve. For example, the particle size exceeding 5 mm means that the particle size is sieved using a 5 mm mesh sieve. The particle size on the sieve means a particle size of 5 mm or less means a particle size sieved to a size below the sieve using a sieve with a 5 mm mesh. Each value of the particle diameter of the finished sintered ore 72 and the returned ore 74 is an example, and it is not limited to this value.

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

A high FeO concentration in the finished sintered ore 72 indicates that a large amount of residual magnetite is present in the finished sintered ore 72, and it is predicted that the sintering reaction temperature is high and the sintered cake becomes high temperature. Therefore, even if the sintered cake is pulverized and cooled by the cooler 60, the sintered ore cannot be cooled below the upper limit temperature of the exit side of the cooler 60, which may cause the abnormal stop of the cooler 60 or be more severe than the cooler 60. Equipment obstacles such as failure of equipment on the downstream side.

Therefore, the correspondence between the FeO concentration of the sintered ore and the temperature of the sintered ore on the output side of the cooler 60 is grasped in advance for each traveling speed of the pallet trolley, and management of the FeO concentration that exceeds the upper limit temperature of the output side of the cooler 60 is set value. In the step of adjusting the pallet trolley, the FeO concentration of the finished sintered ore 72 is further increased than the management value. When the sintered ore temperature on the outlet side of the cooler 60 calculated according to the corresponding relationship is predicted to exceed the upper limit temperature, the adjustment is performed. The traveling speed of the pallet trolley slows down the traveling speed of the pallet trolley. If the traveling speed of the pallet trolley is slowed, the cooling time by the cooler 60 becomes longer, so the temperature of the sintered ore on the exit side of the cooler 60 becomes lower. In this way, the temperature of the sintered ore on the outlet side of the cooler 60 can be reduced, so that the occurrence of equipment obstacles such as abnormal stoppage of the cooler 60 or failure of equipment on the downstream side than the cooler 60 can be suppressed.

In the example, the FeO concentration of the finished sintered ore 72 is continuously measured in the measurement step, and the FeO concentration at the finished sintered ore 72 is further increased than the management value. The output side of the cooler 60 calculated according to the corresponding relationship is shown. When the temperature of the sintered ore exceeds the upper limit temperature, an example of adjusting the traveling speed of the pallet trolley is used, but in the measurement step, the C concentration of the finished sintered ore 72 may be measured instead of the FeO concentration. The correspondence 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 of the outlet side of the cooler 60 is set in advance. As a result, the travel speed of the pallet trolley is slowed down. This means that the temperature in the width direction of the sintering machine becomes uneven and C is not burned, so that the C concentration becomes high, and the sintered ore that has not been calcined is discharged. Therefore, by slowing the traveling speed of the pallet trolley and completely burning C on the sintering machine, abnormal stoppage of the cooler 60 caused by C combustion in the cooler 60 or the downstream side of the cooler 60 can be suppressed. The occurrence of equipment obstacles caused by C combustion in the equipment.

The method for manufacturing a sintered ore according to this embodiment may further include a step of adjusting a blending amount, and using at least one or more component concentrations of FeO and C of the finished sintered ore 72 measured in the measurement step to adjust the coagulation material of the sintered raw material. Dispensed. For example, even if the FeO concentration of the finished sinter 72 is further increased than the management value, when the sintering reaction temperature is predicted to be high, the adjustment amount of the coagulation material can be reduced by the adjustment step of the adjustment amount, thereby reducing the sintering reaction. temperature. After the reaction temperature of the sintering is reduced, the traveling speed of the slowed-down pallet car can be restored in the step of adjusting the speed of the palletized car, so the productivity of the sintered ore caused by slowing down the traveling speed of the pallet car can be suppressed. The reduction. As long as the variation in the reaction temperature of the sintering can be suppressed by adjusting the compounding amount of the coagulation material, the variation in the FeO concentration of the sintered ore is suppressed, and the quality of the sintered ore becomes high.

The method for producing a sintered ore according to this embodiment may further include a step of adjusting a blow-in amount, and adjusting at least one of gaseous fuel and oxygen using at least one component concentration of FeO and C of the sintered ore measured in the measurement step. The blow-in volume. For example, even when the FeO concentration of the sintered ore is further increased from the management value, and when the sintering reaction temperature is predicted to be high, the amount of gas fuel and oxygen can be reduced by the step of adjusting the amount of gas injected, This shortens the high-temperature holding time of the sintering reaction temperature. After shortening the high-temperature holding time of the sintering reaction temperature, the traveling speed of the slowed-down pallet truck can be restored in the step of adjusting the speed of the palletized car, so that production caused by slowing down the traveling speed of the pallet truck can be suppressed. Sexual decline. As long as the fluctuation in the reaction temperature of the sintering can be suppressed by adjusting the amount of at least one of the gas combustion and the oxygen, the variation in the FeO concentration of the sintered ore is also suppressed, and the quality of the sintered ore is also improved.

In this embodiment, each raw material is cut out from the compounding tanks 22, 24, 25, 26, and 28 of the raw material supply unit 20 for blending. The raw material is made into a sintered raw material in the transfer conveyor 30 and manufactured in a cylindrical mixer 36. Examples of the granulated sintered raw materials are not limited thereto. For example, the sintering raw material prepared with the iron-containing raw material 12, the CaO-containing raw material 16, the MgO-containing raw material 17, and the return ore 74 may be put into the cylindrical mixer 36, and water may be added to the sintering raw material for granulation and granulation. The coagulation material 18 is introduced in the second half of the time, and the carbon material exterior particles that cause the coagulation material 18 to be present on the surface layer are used as the granulated sintering raw material.

A part of the sintering raw material prepared with the iron-containing raw material 12, the CaO-containing raw material 16, the MgO-containing raw material 17, the remineralization 74, and the coagulation material 18 may be charged into the cylindrical mixer 36, and water may be added to the sintering raw material. For the granulation, the remainder of the coagulation material 18 is charged in the second half of the granulation, so that the carbon material exterior particles that cause the coagulation material 18 to exist on the surface layer of the granulated sintering raw material are used as the granulated sintering raw material. As the coagulation material prepared by adding water to the sintering raw material and preparing it in the latter half of the granulation, coke powder or anthracite is used.

When a plurality of cylindrical mixers 36 are provided, and the use of the carbon material exterior particles in which the coagulation material 18 is present on the surface layer, a part or all of the coagulation material 18 may be charged into the final cylindrical mixer 36. In the second half, the sintered raw material is introduced into the cylindrical mixer 36 by the method described above, thereby producing carbon material exterior particles in which the coagulated 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 the water may be added to the first cylindrical mixer 36 or the first cylindrical mixer 36 may be used. A part of the water is added, and the remaining part is added to the other cylindrical mixer 36.

In this embodiment, each raw material is cut out from the compounding tanks 22, 24, 25, 26, and 28 of the raw material supply unit 20 for blending, and is made into a sintered raw material in the transfer conveyor 30, and is mixed in the cylindrical mixer 36. Examples of granulated sintered raw materials are not limited thereto. For example, the sintering raw material prepared with the iron-containing raw material 12, the MgO-containing raw material 17, and the remineralizing 74 may be fed into the cylindrical mixer 36, and water may be added to the sintering raw material for granulation. As the CaO raw material 16 and the coagulation material 18, granulated particles in which the CaO-containing raw material 16 and the coagulation material 18 are present on the surface layer are used as the granulated sintering material.

A part of the iron-containing raw material 12, the MgO-containing raw material 17, the return ore 74, and the coagulation material 18 may be charged into the cylindrical mixer 36, and water may be added to the sintering raw material for granulation and granulation. In the latter half of the time, the remainder of the iron-containing raw material 12 and the CaO-containing raw material 16 are charged, and thus granulated particles in which the iron-containing raw material 12 and the CaO-containing raw material 16 are present on the surface layer are used as the granulated sintering raw material.

A part of the sintering raw material prepared with the iron-containing raw material 12, the return ore 74, the MgO-containing raw material 17, and the CaO-containing raw material 16 may be fed into the cylindrical mixer 36, and water may be added to the sintering raw material for granulation. In the second half of the granulation, the remainder of the CaO-containing raw material 16 and the coagulation material 18 are blended. Thus, granulated particles in which the CaO-containing raw material 16 and the coagulation material 18 are present on the surface layer are used as granulated sintering materials.

The sintering raw material prepared with the iron-containing raw material 12, the return ore 74 and the MgO-containing raw material 17, a part of the CaO-containing raw material 16, and a part of the coagulation material 18 may be fed into the cylindrical mixer 36, and water may be added to the sintering raw material. Granulation is performed, and the remaining portion of the CaO-containing raw material 16 and the remaining portion of the coagulation material 18 are blended in the second half of the granulation. Thus, the granulated particles in which the CaO-containing raw material 16 and the coagulation material 18 are present on the surface layer are used as granulation. Raw materials for sintering.

When a plurality of cylindrical mixers 36 are used and granulated particles are produced in which the CaO-containing raw material 16 or the CaO-containing raw material 16 and the coagulation material 18 are present on the surface layer, a part or all of the CaO-containing raw material 16 and the coagulation may be produced. The material 18 is put into the second half of the final cylindrical mixer 36, and the sintered raw material is put into the cylindrical mixer 36 by the method described above, thereby manufacturing a material in which the CaO-containing raw material 16 and the coagulated material 18 are present on the surface layer. Granulated particles.

In this embodiment, an example is shown in which the raw materials are cut out from the mixing tanks 22, 24, 25, 26, and 28 of the raw material supply unit 20 to be blended, and sintered raw materials are prepared on the transfer conveyor 30, but the invention 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 convey the remainder to a high-speed stirring device for stirring, and then use a granulator such as a cylindrical mixer 36 or a granulator to perform granulation. If necessary, use a dryer to dry and then put them into the conveying conveyor. 30 or 38 in the transfer conveyor. After being subjected to the stirring treatment, the pellets may not be granulated using a granulator such as a cylindrical mixer 36 or a granulator, and may be directly charged into the conveying conveyor 30. Furthermore, at least one of a crushing step and a sieving step may be provided before the stirring process is performed by the high-speed stirring device. When a plurality of cylindrical mixers 36 are used, they can also be put into the transfer conveyor between any of the cylindrical mixers.

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

In the examples and the comparative examples, sintered ore was produced using the sintered ore manufacturing apparatus 10 shown in FIG. 1. In the examples and the comparative examples, an infrared analyzer 80 was set 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 measured FeO concentration was used to determine the FeO concentration of the sintered ore. The sintered ore was produced for 5 hours by adjusting the blending ratio of coke powder as a coagulation material so as to be a FeO management value. Both the examples and the comparative examples were changed to a raw material pile containing iron powder having a high C concentration after 1 hour had elapsed.

The embodiment is an example of a step of adjusting the speed of the pallet car including the traveling speed of the pallet of the sintering machine, and a comparative example is an example of not including the step of adjusting the speed of the pallet car. Therefore, when the FeO concentration of the sintered ore becomes high, in the embodiment, the traveling speed of the pallet trolley is slowed down and the adjustment rate of coke powder is adjusted to deal with it. In the comparative example, the traveling speed of the pallet trolley is not adjusted, and Adjust the blending rate of coke powder.

FIG. 2 shows the FeO concentration (mass%) of the sintered ore, the traveling speed of the pallet trolley (m / min), the blending rate of the coke powder (mass%), and the temperature of the sintered ore at the output side of the cooler (° C). ) Time change chart. 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 the coke powder (mass%), and the temperature of the sintered ore at the exit side of the cooler (° C ) Time change chart.

Since the infrared analyzer 80 continuously measures the FeO concentration of the sintered ore, after the change of the raw material stack, it can be detected as soon as possible that the FeO concentration of the sintered ore is further increased than the FeO management value. Since it is detected that the reaction temperature for sintering becomes higher due to an increase in FeO concentration, and the temperature of the sintered ore on the output side of the cooler exceeds the upper limit temperature, in the embodiment, the sintering machine pallet is slowed down in the step of adjusting the pallet speed And adjust the coke powder blending rate. As a result, an increase in the temperature of the sinter 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. After adjusting the blending ratio of the coke powder and the FeO concentration is restored to the management value, the traveling speed of the pallet trolley is restored to the original speed. This also suppresses a reduction in productivity of the sintered ore.

As described above, in the method for manufacturing a sintered ore according to this embodiment, the FeO concentration of the sintered ore is continuously measured, and at the time point when the FeO concentration of the sintered ore is detected to increase, the traveling speed of the pallet of the sintering machine is adjusted. From this, it was confirmed that the increase in the temperature of the sinter ore on the outlet side of the cooler can be suppressed, the load on the cooler or subsequent equipment can be reduced, and equipment obstacles 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, and therefore the adjustment rate of the coke powder was adjusted. However, the temperature of the sinter ore at the output side of the cooler is reduced after the coke powder is adjusted, and the raw materials already loaded in the sinter are replaced for about 30 minutes. Before that, the temperature of the sinter ore exceeded The upper limit temperature of the cooler's output side rises, and as a result, the cooler stops abnormally. After the cooler and the pallet trolley are stopped, the temperature of the sintering machine is lowered. Therefore, the coke powder blending rate of the sintering raw material is increased, and the sintering ore production 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 C concentration including the increase in the reaction temperature for sintering was high. The sintered raw material of the raw material pile of the iron powder is loaded into the pallet of the pallet tray of the sintering machine. In the comparative example, the blending ratio of the coke powder was adjusted, but it was reflected that the blending ratio adjustment was started from the sintering raw material cut out and blended from the raw material supply section, and it was not reflected in the sintering raw material already loaded into the pallet. in. Therefore, in the comparative example, the temperature of the sintered ore rises due to the increase in the reaction temperature of the sintering, and the temperature of the sintered ore exceeds the upper limit temperature on the outlet side of the cooler. As a result, an obstacle to the equipment such as an abnormal stop of the cooler occurs.

In the embodiment, the increase in FeO concentration of the sintered ore is detected, and at the time 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 palletized car is slowed down in the step of adjusting the palletized car speed. . As a result, the cooling time by the cooler can be extended from the sintering raw material already loaded in the pallet. Therefore, even if the reaction temperature of the sintering of the sintering raw material rises, the temperature rise of the sintered ore on the outlet side of the cooler can be suppressed. This can prevent obstacles such as abnormal stop of the cooler or equipment failure. In this embodiment, an example is shown in which the measurement frequency of the infrared analyzer 80 installed on the transfer conveyor 76 is set to 18 times per hour. However, even if the measurement frequency is lower than this, an adjustment pallet can be obtained. The effect of speed. The measurement frequency may be set at least once within about 30 minutes required for the raw materials loaded in the sintering machine to be replaced.

As described above, in the method for manufacturing a sintered ore according to this embodiment, the sintering reaction temperature is detected as early as possible by continuously measuring the FeO concentration of the sintered ore in the measurement step, and the palletizing cart is slowed down in the step of adjusting the palletizing cart speed. Speed of travel. From this, it was confirmed that even when the reaction temperature of sintering is increased by changing to a raw material stack containing iron powder with a high C concentration, the temperature rise of the sinter ore on the outlet side of the cooler can be suppressed, and the cooler can be suppressed. Equipment failures such as abnormal stoppages or equipment failures of the sintering machine.

10‧‧‧Sinter ore manufacturing equipment

11‧‧‧ Depot

12‧‧‧Iron-containing raw materials

14, 30, 38, 76, 78‧‧‧ Conveyor

16‧‧‧ Contains CaO raw materials

17‧‧‧ containing MgO raw materials

18‧‧‧ Condensation material

20‧‧‧Raw material supply department

22, 24, 25, 26, 28‧‧‧ deployment tank

34‧‧‧ Water

36‧‧‧Cylinder mixer

40‧‧‧Sintering machine

42‧‧‧Sintering material supply device

44‧‧‧ pallet trolley

46‧‧‧Ignition Furnace

48‧‧‧ bellows

50‧‧‧ Crusher

60‧‧‧Cooler

70‧‧‧ screening device

72‧‧‧ finished sinter

74‧‧‧Back to mine

80‧‧‧Infrared Analyzer

82‧‧‧blast furnace

FIG. 1 is a schematic diagram showing an example of a sintered ore manufacturing apparatus 10 that can implement the method for manufacturing a sintered ore of the present embodiment.

FIG. 2 is a graph showing a time change of the FeO concentration of the sintered ore of the example, the traveling speed of the pallet trolley, the blending ratio of coke powder, and the temperature of the sintered ore on the outlet side of the cooler.

FIG. 3 is a graph showing a time change of the FeO concentration of the sintered ore of the comparative example, the traveling speed of the pallet trolley, the blending ratio of coke powder, and the temperature of the sintered ore at the exit side of the cooler.

Claims (5)

A method for manufacturing sintered ore, adding water to the sintered raw material prepared by mixing iron-containing raw materials, CaO-containing raw materials, and coagulating materials, and sintering with a sintering machine to manufacture sintered ore, and the manufacturing method of the sintered ore includes : A measuring step of continuously measuring a component concentration of the sintered ore; and The step of adjusting the speed of the pallet trolley uses the component concentration of the sintered ore measured in the measuring step to adjust the traveling speed of the pallet trolley. The method for manufacturing a sintered ore according to item 1 of the scope of patent application, wherein at least one of a MgO-containing raw material and a SiO ₂ -containing raw material is further arranged in the sintered raw material. The method for manufacturing a sintered ore according to item 1 or 2 of the scope of the patent application, wherein in the measurement step, the concentration of at least one component of FeO and C of the sintered ore is continuously measured. The method for manufacturing a sintered ore as described in any one of claims 1 to 3 of the scope of patent application, further comprising: a step of adjusting a blending amount, using the component concentration of the sintered ore to adjust the blending material of the sintering raw material. the amount. The method for manufacturing a sintered ore according to any one of claims 1 to 4, wherein the sintering machine blows at least one of a gaseous fuel and oxygen to sinter a sintering raw material, and The method for manufacturing a sintered ore further includes a step of adjusting a blowing amount, and adjusting a blowing amount of at least one of the gaseous fuel and the oxygen using a component concentration of the sintered ore.