JP2019173161A - Method for manufacturing sintered ore - Google Patents

Abstract

To provide a method for manufacturing sintered ore in which fluctuation of charging density of a charging layer can be made smaller even if the component concentration of a sintering raw material fluctuates during manufacture of sintered ore.SOLUTION: A method for manufacturing sintered ore in which a sintering raw material created by blending at least an iron-containing raw material, a CaO-containing raw material and a coagulation material is pelletized, a pelletized sintering raw material is charged from a raw material charging apparatus of the sintering machine to a pallet carriage to form a charging layer, and the charging layer is sintered by the sintering machine to manufacture sintered ore. The raw material charging apparatus is equipped with a charging gate and a chute. The method has: a measurement process of measuring at least single component concentration out of the iron-containing raw material, the sintering raw material and the pelletized sintering raw material; and an adjustment process of adjusting at least one of an opening level of the charging gate and an inclination angle with respect to a horizontal surface of the chute by using component concentration measured in the measurement process such that the charging density of the charging layer becomes a predetermined charging density.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing a sintered ore that can produce a sintered ore by adjusting the state of a charging layer formed by charging a sintering raw material into a pallet carriage of a sintering machine.

In the blast furnace ironmaking method, sintered ore, massive iron ore, pellets, and the like are currently used as blast furnace raw materials as iron sources. Here, the sintered ore is not only iron ore having a particle size of 10 mm or less, but also miscellaneous iron sources such as dust, sludge and return ore generated in the steel mill, and CaO-containing raw materials such as limestone, quicklime and slag. Sintered raw materials including SiO ₂ source and MgO source composed of silica, serpentine, dolomite and refined nickel slag, etc., and solid fuel (carbon material) which is a coagulant composed of powdered coke and anthracite, It is a kind of agglomerated mineral that is mixed, granulated and sintered while adding water with a drum mixer.

  The sintering raw material is charged into a pallet truck of a sintering machine to form a charging layer. The layer thickness and charging density of the charging layer greatly affect the air permeability during sintering, and influence the quality, productivity and yield of the sintered ore. In particular, when using a sintering machine in which a magnetic brake is provided on the chute, the charging speed of the sintering raw material varies depending on FeO contained in the sintering raw material. For this reason, in order to pre-control the charging state of the charging layer, it is necessary to adjust the magnetic flux density of the magnetic brake.

  As a technique for adjusting the magnetic flux density of the magnetic brake, Patent Document 1 discloses a magnetic fine powder that adjusts the magnetic force of the magnetic chute to make the charging speed of the sintered material within a specific range, thereby deteriorating the air permeability. A method of operating a sintering machine is disclosed in which the raw material is segregated and charged on the upper layer side to minimize deterioration in air permeability. In Patent Document 2, the magnetic flux density on the surface of the built-in magnetic drum arranged at the tip of the sloping chute is adjusted, and the charging of the sintered raw material in which a large amount of ferromagnetic materials such as return or mill scale is unevenly distributed in the upper layer of the charging layer A method is disclosed.

Japanese Patent Laid-Open No. 2006-89268 JP 2001-234257 A

In recent years, the iron concentration of iron ore has decreased, and the concentration of gangue components such as SiO ₂ and Al ₂ O ₃ has increased instead. Even if iron ores taken from the same pile have different component concentrations The more or less the iron ore component concentration is becoming unstable. In addition, regarding various types of dust generated in the steelworks, fluctuations in the amount of generation and fluctuations in the components of the dust itself are large, making it very difficult to manage the component concentration of the sintering raw material. Patent Documents 1 and 2 disclose a technique for adjusting the charging state of the charging layer by adjusting the magnetic force of the magnetic brake, but the concentration of the components of the sintering raw material varies during the production of the sintered ore. Then, even if it adjusted the magnetic force of the magnetic brake, the subject that the charging state of a charging layer could not be adjusted occurred.

  The present invention has been made in view of such problems of the prior art, and its purpose is to provide a charging density of the charging layer even if the component concentration of the sintering raw material fluctuates during the production of the sintered ore. An object of the present invention is to provide a method for producing a sintered ore that can reduce the fluctuation of the sinter.

The features of the present invention that solve such problems are as follows.
(1) Granulate a sintered raw material containing at least an iron-containing raw material, a CaO-containing raw material and a coagulant, and charge the granulated sintered raw material from a raw material charging device of a sintering machine to a pallet truck. Forming a charge layer, sintering the charge layer with a sintering machine to produce a sintered ore,
The raw material charging apparatus includes a charging gate and a chute, and measures a concentration of at least one of the iron-containing raw material, the sintered raw material, and the granulated sintered raw material, Using the component concentration measured in the measurement step, at least one of the opening degree of the charging gate and the inclination angle of the chute with respect to the horizontal plane so that the charging density of the charging layer becomes a predetermined charging density. A method for producing sintered ore, comprising: an adjusting step for adjusting one.
(2) The method for producing a sintered ore according to (1), wherein in the measurement step, at least a CaO component concentration is measured.
(3) Granulate a sintered raw material containing at least an iron-containing raw material, a CaO-containing raw material, and a coagulant, and charge the granulated sintered raw material from a raw material charging device of a sintering machine to a pallet truck. Forming a charge layer and sintering the charge layer with a sintering machine to produce a sintered ore, the iron-containing raw material, the sintered raw material, and the granulation The charging density of the charging layer becomes a predetermined charging density by using a measuring step for measuring the concentration of at least one component of the sintered raw material thus obtained and the concentration of the component measured in the measuring step. And adjusting the at least one of the opening of the charging gate, the inclination angle of the chute with respect to the horizontal plane, and the magnetic force of the magnetic brake.
(4) The method for producing a sintered ore according to (3), wherein at least the component concentration of FeO is measured in the measurement step.
(5) As the component concentration of CaO measured in the measurement step increases, at least one of the opening degree of the charging gate and the inclination angle of the chute with respect to the horizontal plane is increased in the adjustment step. The manufacturing method of the sintered ore as described.
(6) As the FeO component concentration measured in the measurement step increases, the adjustment step increases the opening of the charging gate, increases the inclination angle of the chute with respect to the horizontal plane, and the magnetic brake The method for producing a sintered ore according to (4), wherein at least one of weakening the magnetic force is performed.

  By carrying out the method for producing a sintered ore of the present invention, even if the component concentration of the sintering raw material fluctuates during the production of the sintered ore, the fluctuation in the charging density of the charging layer can be reduced, Reduction of the production base can be realized.

It is a schematic diagram which shows an example of the sintered ore manufacturing apparatus 10 which can implement the manufacturing method of the sintered ore which concerns on 1st Embodiment. It is a side surface cross-section schematic diagram which shows the sintering raw material charging device. It is a side cross-sectional schematic diagram of the sintering raw material charging device 43 used with the manufacturing method of the sintered ore which concerns on 2nd Embodiment. It is a graph which shows the fluctuation | variation of the CaO density | concentration in the invention example 1, a pseudo particle diameter, the opening degree of a charging gate, charging thickness, and a production base. It is a graph which shows the fluctuation | variation of the CaO density | concentration in the comparative example 1, a pseudo particle diameter, the opening degree of a charging gate, charging thickness, and a production base. It is a graph which shows the fluctuation | variation of the FeO density | concentration in the example 2, the opening degree of a charging gate, the charging thickness of a charging layer, and a production base. It is a graph which shows the fluctuation | variation of the FeO density | concentration in the comparative example 2, the opening degree of a charging gate, the charging thickness of a charging layer, and a production base.

  Hereinafter, the present invention will be described through embodiments of the invention. Drawing 1 is a mimetic diagram showing an example of the sintered ore manufacturing device 10 which can carry out the manufacturing method of the sintered ore concerning a 1st embodiment. The iron-containing raw material 12 stored in the yard 11 as a raw material pile is transported to the blending tank 22 by the transport conveyor 14. The iron-containing raw material 12 includes various brands of iron ore and dust generated in the steelworks. The dust generated in the steelworks contains CaO, and its component concentration varies. For this reason, the CaO component concentration of the iron-containing raw material 12 including the dust generated in the ironworks also varies.

  The raw material supply unit 20 includes a plurality of blending tanks 22, 24, 25, 26, and 28. The iron-containing raw material 12 is stored in the blending tank 22. The compounding tank 24 stores a CaO-containing raw material 16 containing limestone or quicklime, and the compounding tank 25 stores an MgO-containing raw material 17 containing dolomite, refined nickel slag, or the like. The blending tank 26 stores a coagulant 18 containing powdered coke and anthracite that have been crushed to a particle size of 1 mm or less using a rod mill. Further, the blending tank 28 stores return mineral (sintered ore sieving powder) having a particle size of 5 mm or less that has been sieved under the sintered ore. A predetermined amount of each raw material is cut out from the mixing tanks 22 to 28 of the raw material supply unit 20, and these are mixed to become a sintered raw material. The sintered raw material is transported to the drum mixer 36 by the transport conveyor 30. In addition, the MgO containing raw material 17 is an arbitrary mixing raw material, Comprising: It may be mix | blended with a sintering raw material and does not need to be mix | blended.

  An infrared analyzer 32 is provided on the conveyor 30 between the mixing tank 28 and the drum mixer 36. A measurement process is performed using the infrared analyzer 32. In the measurement step, the moisture and CaO component concentrations contained in the sintered raw material conveyed on the conveyor 30 are continuously measured. However, since the moisture concentration of the sintering raw material hardly fluctuates, the past actual value may be used without measuring the moisture concentration of the sintering raw material.

  The infrared analyzer 32 irradiates the sintering raw material with infrared rays having a wavelength in the range of 0.5 to 50.0 μm, and receives reflected light from the sintering raw material. Since the molecular vibration of CaO contained in the sintering raw material absorbs the intrinsic wavelength component of the irradiated infrared ray, these components give the intrinsic wavelength component to the reflected infrared ray. For this reason, the component concentration of CaO in the sintering raw material can be measured by analyzing the irradiated infrared rays and the reflected infrared rays.

  For example, the infrared analyzer 32 can irradiate infrared rays having a wavelength of 20 or more at a frequency of 128 times per minute, and can receive reflected light reflected by the sintering material. Thus, since infrared rays can be irradiated in a short time, the infrared analyzer 32 can continuously measure the component concentration of the sintering raw material conveyed on the conveyor 30 on-line. The infrared analyzer 32 is an example of an analyzer that measures the component concentration of the sintering raw material, and is not limited to a device that divides the reflected light, but may use a device that scatters the transmitted light. Further, instead of the infrared analyzer 32, a laser analyzer that irradiates the measurement target with a laser, a neutron analyzer that irradiates the measurement target with neutrons, or a microwave analyzer that irradiates the measurement target with microwaves may be used. Good. In the present embodiment, the measurement frequency of the measurement process is, for example, 128 times per minute, and the average value of the component concentration of 128 times is calculated once per minute.

  The sintering raw material conveyed to the drum mixer 36 is put into the drum mixer 36, and an appropriate amount of water 34 is added, and granulated into, for example, pseudo particles having an average particle diameter of 3.0 to 6.0 mm. The granulated sintered raw material is conveyed to the sintered raw material charging device 42 of the sintering machine 40 by the conveying conveyor 38. The drum mixer 36 is an example of a granulating apparatus that granulates the sintering raw material, and there may be a plurality of drum mixers 36, and a pelletizer granulator may be used instead of the drum mixer 36. Further, both the drum mixer 36 and the pelletizer granulator may be used, and a high-speed stirrer may be installed upstream of the drum mixer 36 to stir the sintered raw material before granulation. In this embodiment, the average particle diameter is an arithmetic average particle diameter, and Σ (Vi × di) (where Vi is the abundance ratio of particles in the i-th particle size range, and di is the i-th particle diameter range) The particle size is defined by the following formula: In the following description, the average particle size of the pseudo particles may be described as a pseudo particle size.

  The sintering machine 40 is, for example, a downward suction type dwyroid sintering machine. The sintering machine 40 includes a sintering raw material charging device 42, an endless moving pallet truck 44, an ignition furnace 46, a gaseous fuel supply device 47, and a wind box 48.

  FIG. 2 is a schematic side sectional view showing the sintering raw material charging device 42. The sintered raw material charging device 42 includes a feed hopper 82, a drum feeder 84, a charging gate 86, and a chute 88. The granulated sintered raw material conveyed to the sintering raw material charging device 42 is charged into the feed hopper 82. The sintered raw material in the feed hopper 82 is cut out by the drum feeder 84, passes through the charging gate 86, slides down on the chute 88 in the direction of arrow 90, and is loaded into the pallet truck 44. The sintered material charged in the pallet carriage 44 forms a charged layer of the sintered material. An arrow 92 indicates the traveling direction of the pallet carriage 44.

  The charging gate 86 is a plate-like member provided in plural along the width direction of the sintering machine 40. Each charging gate 86 is provided with an opening adjusting device (not shown) for adjusting the opening. In the charging gate 86, the opening degree of the charging gate 86 is adjusted by the opening adjusting device, whereby the charging speed and charging state of the sintered raw material charged in the pallet carriage 44 are adjusted.

  The chute 88 is a plate-like member that extends in the width direction of the sintering machine 40 and is inclined at a predetermined inclination angle α with respect to the horizontal plane. The chute 88 is provided with an angle adjusting device (not shown) that adjusts the inclination angle α. In the chute 88, the inclination angle α of the chute 88 is adjusted by the angle adjusting device, whereby the charging speed and charging state of the sintered raw material charged in the pallet carriage 44 are adjusted.

  Referring again to FIG. 1, the charging layer is ignited in the ignition furnace 46. By sucking air through the wind box 48, the charging layer takes in the gaseous fuel and oxygen supplied from the gaseous fuel supply device 47 provided above into the charging layer, and condenses with the gaseous fuel in the charging layer. While burning the material 18, the combustion / melting zone in the charging layer is moved below the charging layer. Thereby, the charging layer is sintered to form a sintered cake. In this embodiment, the gaseous fuel is selected from blast furnace gas, coke oven gas, blast furnace / coke oven mixed gas, converter gas, city gas, natural gas, methane gas, ethane gas, propane gas, shale gas, and mixed gas thereof. Any flammable gas. In the example shown in FIG. 1, the example of the sintering machine 40 having the gaseous fuel supply device 47 is shown, but the sintering machine 40 may not have the gaseous fuel supply device 47.

  The sintered cake is crushed by the crusher 50 into a sintered ore. The sintered ore crushed by the crusher 50 is cooled by the 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 product sintered ore 72 having a particle size of more than 5 mm and a return ore 74 having a particle size of 5 mm or less. Is done.

  The sintered product ore 72 is transported to the blast furnace 80 by the transport conveyor 76 and charged into the blast furnace 80 as a blast furnace raw material. On the other hand, the return ore 74 is transported to the blending tank 28 of the raw material supply unit 20 by the transport conveyor 78. In addition, since the sintered ore 72 crushed by the crusher 50 is cooled and sieved, the product sintered ore 72 is the product ore 72 and the sintered ore crushed by the crusher 50. Sinter with the same component concentration. In this embodiment, the particle size of the sintered product ore 72 and the particle size of the return ore 74 mean the particle size that is sieved by a sieve. For example, the particle size of more than 5 mm means a sieve having an opening of 5 mm. The particle size of 5 mm or less is a particle size that is sieved under a sieve using a sieve having an opening of 5 mm. Furthermore, each value of the particle diameter of the product sintered ore 72 and the return ore 74 is an example to the last, and is not limited to this value.

The inventors have discovered that in the production of sintered ore using the sintered ore production apparatus 10, the production base of the sintered ore tends to decrease as the CaO component concentration of the sintering raw material increases. Here, the production base of sintered ore is the production amount (t / h) of sintered ore per hour, and the more this production base, the better the operating condition of the production of sintered ore. . In order to investigate the mechanism by which the production base of sintered ore declines when the CaO component concentration of the sintering raw material increases, the behavior of the sintering raw material including the granulation step, which is the previous step of the sintering step, was observed. It has been found that the higher the CaO component concentration of the sintering raw material, the larger the diameter of the pseudo particles granulated in the granulation process, the lower the charging density of the charging layer, and the lower the production base of sintered ore. It was. From this, when the CaO component concentration becomes high, the cut volume per hour (m ³ / h) of the sintering raw material to the sintering machine is increased to change the charging density of the charging layer. The idea was to suppress, and thereby suppress the decline in the production base of sintered ore.

  For this reason, in the manufacturing method of the sintered ore which concerns on 1st Embodiment, the charging state of a charging layer will be in the state defined beforehand further using the component density | concentration of CaO continuously measured by the measurement process. As described above, an adjustment step is performed to adjust at least one of the opening degree of the charging gate 86 and the inclination angle of the chute 88 with respect to the horizontal plane. In the present embodiment, the average particle diameter of the pseudo particles and the charging density of the charging layer are estimated from the CaO component concentration continuously measured in the measurement process and the preset granulation conditions of the drum mixer 36. The adjustment step is performed so that the charging density of the charging layer becomes a predetermined charging density. Thus, the fluctuation of the charging density of the charging layer is reduced by adjusting the charging density of the charging layer to be a predetermined charging density.

  For example, when the CaO concentration of the sintering raw material is higher than the reference CaO concentration, the granulation property of the sintering raw material is improved, so that pseudo particles having a large average particle diameter are granulated. The charge layer formed by pseudo particles having a large average particle diameter has a larger gap between the particles than the charge layer formed by pseudo particles having a small average particle diameter, so that the air permeability of the charge layer is improved. The charging density decreases.

  Thus, when the CaO concentration of the sintering raw material increases, the charging density of the charging layer decreases and the production base of the sintered ore decreases. For this reason, when the CaO concentration of the sintering raw material becomes higher than the reference CaO concentration, at least one of the opening degree of the charging gate 86 and the inclination angle of the chute 88 is increased, and the sintering raw material is charged. Increase the charging speed by increasing the charging speed. Thereby, the fall of the charging density of a charging layer is suppressed, and the fall of the production base of a sintered ore is suppressed.

  Adjustment of the opening degree of the charging gate 86 and the inclination angle of the chute 88 is performed based on the CaO concentration of the sintering raw material serving as a reference and the CaO concentration of the sintering raw material measured in the measurement process. The reference CaO concentration is obtained by calculating the average particle diameter of the pseudo particles on which the charging layer having the target charging density is formed based on the opening of the charging gate 86 and the inclination angle of the chute 88. You may determine from the CaO density | concentration of the sintering raw material by which the pseudo particle of a diameter is granulated.

  On the other hand, when the CaO concentration of the sintered raw material measured in the measurement process is lower than the CaO concentration of the sintering raw material as a reference, the granulation property of the sintered raw material is lowered, so that pseudo particles having a small average particle diameter are formed. Grained. The charge layer formed by the pseudo particles having a small average particle diameter has a smaller gap between the particles than the charge layer formed by the pseudo particles having a large average particle diameter, so the air permeability of the charge layer is reduced. The charging density is improved.

  Thus, when the CaO concentration of the sintered raw material is lowered, the charging density of the charging layer is improved and the air permeability of the charging layer is lowered. For this reason, when the CaO concentration of the sintering raw material is lower than the reference CaO concentration, at least one of the opening degree of the charging gate 86 and the inclination angle of the chute 88 is reduced, and the sintering raw material is charged. Decrease the charging speed to lower the charging density of the charging layer. Thereby, the deterioration of the air permeability of the charging layer is suppressed, and the decrease in the production base of the sintered ore can be suppressed.

  As described above, in the method for producing sintered ore according to the first embodiment, the CaO component concentration affecting the granulation property of the sintered raw material is continuously measured, and the average particle size of the pseudo particles is determined from the component concentration. The adjustment step is performed so that the diameter and the charging density of the charging layer are estimated and the charging density of the charging layer becomes a predetermined charging density. Thereby, the fluctuation | variation of the charging density of a charging layer becomes small, and the fall of the production base of a sintered ore is suppressed.

  When the variation of the charging density of the charging layer becomes large, a deviation in air permeability in the length direction of the sintering machine occurs, and the sintering completion position of the sintering raw material varies. The yield of sintered ore decreases due to the fluctuation of the sintering completion position. Further, when the traveling speed of the pallet carriage 44 is changed to adjust the sintering completion position, the production base is lowered. Thus, the increase in the charging density of the charging layer leads to a decrease in the production base of the sintered ore.

  In addition, in the example shown in FIG. 1, although the infrared analyzer 32 was provided in the conveyance conveyor 30 and the example which implements a continuous measurement process was shown, it is not restricted to this. For example, the infrared analyzer 32 may be provided on the conveyor 14 to perform the measurement process, or the infrared analyzer 32 may be provided on the conveyor 30 between the mixing tank 22 and the mixing tank 24 to perform the measurement process. Also good. In this case, in the measurement step, the CaO component concentration of the iron-containing raw material 12 conveyed to the blending tank 22 is continuously measured.

  The factor that causes the CaO component concentration to fluctuate in the sintered raw material is greatly influenced by the variation in the CaO component concentration contained in the dust generated in the steelworks. If the component concentration of CaO of each raw material blended from the raw material supply unit 20 is measured in advance and the mass of each raw material blended from the raw material supply unit 20 and the mass of CaO contained in each raw material are known, iron The CaO component concentration of the sintering raw material can be calculated from the CaO component concentration of the containing raw material 12, the mass of each raw material blended from the raw material supply unit 20, and the mass of CaO contained in each blended raw material.

  Moreover, in the example shown in FIG. 1, although the infrared analyzer 32 was provided in the conveyance conveyor 30 and the example which implements a measurement process was shown, it is not restricted to this. For example, the infrared analyzer 32 may be provided on the transport conveyor 38, and the CaO component concentration of the granulated sintered raw material may be continuously measured.

  Next, the manufacturing method of the sintered ore which concerns on 2nd Embodiment is demonstrated. The sintered ore manufacturing method according to the second embodiment includes a point in which the FeO component concentration is continuously measured in the measurement step, and the charging gate opening, the chute inclination angle, and the magnetic brake magnetic force in the adjustment step. It differs from the method for producing sintered ore according to the first embodiment in that at least one is adjusted.

  FIG. 3 is a schematic side cross-sectional view of a sintering raw material charging device 43 used in the method for producing a sintered ore according to the second embodiment. In the sintering raw material charging apparatus 43 shown in FIG. 3, the same components as those in the sintering raw material charging apparatus 42 shown in FIG.

  In the method for producing a sintered ore according to the second embodiment, a sintered raw material charging device 43 shown in FIG. 3 is used instead of the sintered raw material charging device 42 shown in FIG. The sintered raw material charging device 43 includes a feed hopper 82, a drum feeder 84, a charging gate 86, a chute 88, and a magnetic brake 94. The magnetic brake 94 includes a position adjusting device 96 and a magnet 98. The magnetic force of the magnet 98 acts on the magnetized raw material (FeO) of the sintered raw material that slides down the surface of the chute 88 and reduces the charging speed of the sintered raw material that slides down on the chute 88.

  The position adjusting device 96 adjusts the position of the magnet 98 from the chute 88. When the distance between the magnet 98 and the chute 88 is increased by the position adjusting device 96, the magnetic force acting on the sintered raw material sliding down on the chute 88 is reduced, so that the charging speed of the sintered raw material is increased. On the other hand, when the distance between the magnet 98 and the chute 88 is reduced by the position adjusting device 96, the magnetic force acting on the sintered raw material sliding down on the chute 88 is increased, so that the charging speed of the sintered raw material is reduced. Thus, the magnetic force of the magnetic brake 94 can be adjusted by the position of the position adjusting device 96, thereby adjusting the charging speed of the sintering raw material.

  Also in the method for manufacturing a sintered ore according to the second embodiment, a measurement process using the infrared analyzer 32 is performed. In the measurement process, the component concentration of FeO contained in the sintered raw material conveyed on the conveyor 30 is continuously measured. And the adjustment process which adjusts the magnetic force of the magnetic brake 94 using the component density | concentration of FeO continuously measured by the measurement process is implemented. In the present embodiment, the adjusting step estimates the charging density of the charging layer from the FeO component concentration continuously measured in the measuring process and the current position of the magnetic brake 94, and the charging density of the charging layer is An adjustment process is implemented so that it may become a predetermined density. Thus, the fluctuation of the charging density of the charging layer is reduced by adjusting the charging density of the charging layer to be a predetermined density.

  For example, when the FeO concentration of the sintering raw material is higher than the reference FeO concentration, the magnetic force of the magnetic brake 94 acting on the sintering raw material increases, so the charging speed of the sintering raw material becomes slow and the charging density becomes low. descend. Thus, when the FeO concentration of the sintering raw material increases, the charging density of the charging layer decreases and the production base of the sintered ore decreases.

  For this reason, when the FeO concentration of the sintering raw material is higher than the reference FeO concentration, the magnetic force of the magnetic brake 94 is weakened to increase the charging speed and increase the charging density. Thereby, the fall of the charging density of a charging layer is suppressed, and the fall of the production base of a sintered ore is suppressed.

  The magnetic force of the magnetic brake 94 is adjusted based on the reference FeO concentration of the sintering raw material and the FeO concentration of the sintering raw material measured in the measurement process. The reference FeO concentration is determined by determining the charging speed at which a charging layer having a target charging density is formed by the magnetic force of the magnetic brake 94 as a reference, and FeO of the sintered raw material charged at the charging speed. It may be determined from the concentration.

  On the other hand, when the FeO concentration of the sintering raw material measured in the measurement process is lower than the reference FeO concentration of the sintering raw material, the magnetic force of the magnetic brake 94 acting on the sintering raw material becomes small. When the magnetic force of the magnetic brake 94 is reduced, the charging speed of the sintered raw material is increased, the charging density of the charging layer is increased, and the air permeability of the charging layer is lowered.

  As described above, when the FeO concentration of the sintered raw material is lowered, the charging density of the charging layer is improved and the air permeability of the charging layer is lowered. For this reason, when the FeO concentration of the sintering raw material is lower than the reference FeO concentration, the magnetic force of the magnetic brake 94 is increased, the charging speed is decreased, and the charging density of the charging layer is lowered. Thereby, the deterioration of the air permeability of the charging layer is suppressed, and the decrease in the production base of the sintered ore can be suppressed.

  As described above, in the method for producing a sintered ore according to the second embodiment, the FeO component concentration of the sintering raw material is continuously measured, the charging density of the charging layer is estimated from the component concentration, The adjustment process is performed so that the charging density of the layer becomes a predetermined charging density. Thereby, the fluctuation | variation of the charging density of a charging layer becomes small, and the fall of the production base of a sintered ore is suppressed.

  In the second embodiment, the example in which the magnetic force of the magnetic brake 94 is adjusted so that the charging density of the sintered raw material becomes a predetermined charging density is shown, but the present invention is not limited to this. As described in the first embodiment, the charging density of the charging layer can be increased by increasing the opening of the charging gate 86 or increasing the inclination angle of the chute 88. The charging density of the charging layer can be reduced by decreasing the opening 86 or by reducing the inclination angle of the chute 88 with respect to the horizontal plane. For this reason, instead of adjusting the magnetic force of the magnetic brake 94 or adjusting the magnetic force of the magnetic brake 94, at least one of the opening degree of the charging gate 86 and the inclination angle of the chute 88 with respect to the horizontal plane may be adjusted. Good. For example, when the FeO concentration is higher than the reference FeO concentration, instead of decreasing the magnetic force of the magnetic brake 94 or decreasing the magnetic force of the magnetic brake 94 and increasing the opening of the charging gate 86, The inclination angle of the chute 88 may be increased. Thereby, the charging speed of a sintering raw material is adjusted, and the fluctuation | variation of the charging density of a charging layer can be made small. Further, the CaO concentration of the sintering raw material is further measured in the measurement step in the second embodiment, and the charging density of the charging layer becomes a predetermined charging density based on the FeO concentration and the CaO concentration in the adjusting step. As described above, at least one of the magnetic force of the magnetic brake 94, the opening degree of the charging gate 86, and the inclination angle of the chute 88 with respect to the horizontal plane may be adjusted.

Example 1
Example 1 in which the product sintered ore was produced for 48 hours by the method for producing sintered ore according to the first embodiment using the sintered ore producing apparatus 10 having the sintering raw material charging device 42 shown in FIG. explain. In Invention Example 1 of Example 1, the measurement process of continuously measuring the CaO component concentration of the sintering raw material at a frequency of once per hour using the infrared analyzer 32 provided on the conveyor 30 was performed. Then, using the component concentration of CaO continuously measured in the measurement process, the opening of the charging gate is adjusted at a frequency of once every hour so that the charging density of the charging layer becomes a predetermined target value. The sintered ore was produced for 48 hours while carrying out the adjusting step of adjusting.

  FIG. 4 is a graph showing variations in CaO concentration, pseudo particle diameter, charging gate opening, charging thickness, and production base in Invention Example 1. 4 (a) shows the fluctuation of the sintering raw material CaO concentration (mass%), FIG. 4 (b) shows the fluctuation of the pseudo particle diameter (mm), and FIG. 4 (c) shows the opening of the charging gate. 4 (d) shows the variation of the charging thickness (mm), and FIG. 4 (e) shows the variation of the production base (t / h) of the sintered ore. The horizontal axis common to FIGS. 4A to 4D is the elapsed time (h). FIG. 4C shows the variation of the charging thickness. When the charging thickness is increased, the charging density of the charging layer is increased, and when the charging thickness is decreased, the charging density of the charging layer is also decreased. . Thus, since the charging thickness and the charging density correspond one-to-one, if the fluctuation of the charging thickness is reduced, the fluctuation of the charging density is also reduced.

  The raw material pile of the iron-containing raw material 12 is switched to another raw material pile about once every six days. In Invention Example 1, the switching of the raw material pile was performed when 30 hours passed in the figure.

  In Invention Example 1, as shown in FIG. 4 (a), the CaO concentration of the sintering raw material increased, and as a result, the pseudo particle size also increased as shown in FIG. 4 (b). In Invention Example 1, since the component concentration of CaO is continuously measured by the measurement process, the increasing tendency of the component concentration of CaO shown in FIG. 4A can be quickly grasped, and the pseudo particle size becomes large and charged. It can be predicted that the density will decrease. For this reason, in Invention Example 1, as shown in FIG. 4 (c), step by step from the elapse of 14 hours to the elapse of 31 hours so that the charging density becomes a predetermined target charging density. An adjustment process was performed to increase the opening of the charging gate. Specifically, in Invention Example 1, the gate opening was adjusted according to the correspondence table of CaO concentration and charging gate opening shown in Table 1 below.

  If the opening of the charging gate is not adjusted, the charging density of the charging layer is lowered. In the invention example 1, the charging density is increased by adjusting the opening of the charging gate as described above. As shown in (d), the charge density can be set to the target charge density, and the fluctuation of the charge density is reduced. In this way, by setting the charging density to the target charging density and reducing the fluctuation of the charging density, in Invention Example 1, as shown in FIG. It was maintained at a high level.

  In the comparative example 1 of Example 1, the measurement process which measures continuously the CaO component density | concentration of a sintering raw material is not implemented. In Comparative Example 1, the CaO component concentration of the sintering raw material is measured off-line at the time of switching the raw material pile when 30 hours have elapsed, and the charging density of the charging layer is determined in advance using the measured value. The opening of the charging gate was adjusted so that the sintered ore was produced for 48 hours.

  FIG. 5 is a graph showing variations in CaO concentration, pseudo particle diameter, charging gate opening, charging thickness, and production base in Comparative Example 1. FIG. 5 (a) shows the fluctuation of the sintering raw material CaO concentration (mass%), FIG. 5 (b) shows the fluctuation of the pseudo particle diameter (mm), and FIG. 5 (c) shows the opening of the charging gate. 5 (d) shows the fluctuation of the charging thickness (mm), and FIG. 5 (e) shows the fluctuation of the production base (t / h) of the sintered ore. The horizontal axis common to FIGS. 5A to 5D is the elapsed time (h). Also in Comparative Example 1, the switching of the raw material pile was performed when 30 hours had elapsed. In FIG. 5A, a ◯ plot is shown every hour, but this is not the value of the measured component concentration but the concentration of each component measured at the time of pile switching.

  In Comparative Example 1 of Example 1, the CaO component concentration of the sintered raw material was measured by off-line measurement when the raw material pile was switched over after 30 hours, and the opening of the charging gate was adjusted using the measured value. . However, it was not possible to cope with the fluctuations in the CaO component concentration during the production of the sintered ore, and as shown in FIG. Due to this variation in charging density, in Comparative Example 1, as shown in FIG. 5 (e), the variation in the production base of the sintered ore also increased, and a large decrease in the production base was confirmed in some places.

  As described above, in the method for producing a sintered ore according to the first embodiment, even if the CaO component concentration of the sintering raw material during the production of the sintered ore fluctuates, charging is performed according to the fluctuation of the component concentration. The opening of the charging gate is adjusted so that the charging density of the layer becomes a predetermined charging density. Thereby, it was confirmed that the fluctuation of the charging density of the charging layer was reduced, and the decrease in the production base of the sintered ore was suppressed.

(Example 2)
Next, the product sintered ore was produced for 48 hours by the method for producing sintered ore according to the second embodiment using the sintered ore producing apparatus 10 having the sintering raw material charging device 43 shown in FIG. Example 2 will be described. In Invention Example 2 of Example 2, a measurement process of continuously measuring the FeO component concentration of the sintered raw material at a frequency of once per hour using an infrared analyzer 32 provided on the conveyor 30 was performed. Then, using the FeO component concentration continuously measured in the measurement process, the opening of the charging gate is adjusted at a frequency of once every hour so that the charging speed of the sintering raw material becomes a predetermined target value. The sintered ore was produced for 48 hours while carrying out the adjusting step of adjusting.

  FIG. 6 is a graph showing variations in FeO concentration, charging gate opening, charging layer charging thickness, and production base in Invention Example 2. FIG. 6A shows the variation of the FeO concentration (mass%) of the sintering raw material, FIG. 6B shows the opening degree (%) of the charging gate, and FIG. 6C shows the charging thickness ( mm), and FIG. 6 (d) shows the fluctuation of the production base (t / h) of the sintered ore. The horizontal axis common to FIGS. 6A to 6D is the elapsed time (h).

  The raw material pile of the iron-containing raw material 12 is switched to another raw material pile about once every six days. In Invention Example 2, the material pile was changed after 30 hours.

  In Invention Example 2, since the component concentration of FeO is continuously measured, it is possible to quickly grasp the decreasing tendency of the component concentration of FeO shown in FIG. It can be predicted that the density will increase. For this reason, in Invention Example 2, the opening of the charging gate is gradually reduced after 15 hours as shown in FIG. 6 (b) so as to obtain a predetermined target charging density. The process was carried out. Specifically, in Invention Example 2, the gate opening was adjusted according to the correspondence table of FeO concentration and charging gate opening shown in Table 2 below.

  If the opening of the charging gate is not adjusted, the charging speed increases and the charging density of the charging layer increases, and the charging density is lowered by adjusting the opening of the charging gate described above. As a result, as shown in FIG. 6C, the charging density can be set to the target charging density, and the fluctuation of the charging density is reduced. In this way, in the invention example 2 by setting the charging density to the target charging density and reducing the fluctuation of the charging density, as shown in FIG. It was maintained at a high level.

  In the comparative example 2 of Example 2, the measurement process which measures continuously the component density | concentration of FeO of a sintering raw material is not implemented. In Comparative Example 2, the FeO component concentration of the sintering raw material is measured off-line at the time of switching of the raw material pile after 30 hours, and the charging density of the charging layer is determined in advance using the measured value. The opening of the charging gate was adjusted so that the sintered ore was produced for 48 hours.

  FIG. 7 is a graph showing variations in FeO concentration, charging gate opening, charging layer charging thickness, and production base in Comparative Example 2. FIG. 7 (a) shows the variation of the FeO concentration (mass%) of the sintering raw material, FIG. 7 (b) shows the opening degree (%) of the charging gate, and FIG. 7 (c) shows the charging thickness ( mm), and FIG. 7 (d) shows the fluctuation of the production base (t / h) of the sintered ore. The horizontal axis common to FIGS. 7A to 7D is the elapsed time (h). Also in Comparative Example 2, the switching of the raw material pile was performed when 30 hours had elapsed. In FIG. 7A, a ◯ plot is shown every hour, but this is not the value of the measured component concentration but the concentration of each component measured at the time of material pile switching.

  In Comparative Example 2 of Example 2, when the raw material pile was switched over after 30 hours, the FeO component concentration of the sintered raw material was measured by off-line measurement, and the opening of the charging gate was adjusted using the measured value. . However, the variation in the FeO component concentration during the production of the sintered ore could not be accommodated, and as shown in FIG. Due to this variation in charging density, in Comparative Example 2, as shown in FIG. 7 (d), the variation in the production base of the sintered ore also increased, and a large decrease in the production base was confirmed in some places.

Table 3 below shows the average value of the charging thickness in Invention Example 2 and Comparative Example 2, the fluctuation of the charging thickness, and the product sinter production rate in the production of the product sinter for 48 hours. The product sinter production rate is the ratio of the sintered ore production base shown in Fig. 6 (d) and Fig. 7 (d), excluding the components evaporated from the sintering raw material. It is a value obtained by dividing the value obtained by multiplying the yield and the product sintered ore yield by the sieving device 70 by the sintering area of the pallet truck 44 of the sintering machine 40.

  As shown in Table 3, the variation of the charging thickness of Invention Example 2 was smaller than that of Comparative Example 2, and the production rate of the product sintered ore of Invention Example 2 was higher than that of Comparative Example 2. As described above, by implementing the method for producing sintered ore according to the present embodiment, the charging density can be a target charging density, and the fluctuation of the charging density can be reduced. It was confirmed that the production rate of the ore could be improved.

DESCRIPTION OF SYMBOLS 10 Sinter production apparatus 11 Yards 12 Iron containing raw material 14 Conveyor 16 CaO containing raw material 17 MgO containing raw material 18 Condensed material 20 Raw material supply part 22 Compounding tank 24 Compounding tank 25 Compounding tank 26 Compounding tank 28 Compounding tank 30 Conveying conveyor 32 Infrared rays Analyzer 34 Water 36 Drum mixer 38 Conveyor 40 Sintering machine 42 Sintering raw material charging device 43 Sintering raw material charging device 44 Pallet cart 46 Ignition furnace 47 Gaseous fuel supply device 48 Wind box 50 Crusher 60 Cooling machine 70 Sieve Sorting device 72 Sintered product ore 74 Return ore 76 Transport conveyor 78 Transport conveyor 80 Blast furnace 82 Feeding hopper 84 Drum feeder 86 Loading gate 88 Chute 90 Arrow 92 Arrow 94 Magnetic brake 96 Position adjusting device 98 Magnet

Claims (6)

At least iron-containing raw material, CaO-containing raw material, and a sintered raw material mixed with a coagulant are granulated, and the granulated sintered raw material is charged into a pallet truck from a raw material charging device of a sintering machine. Forming a layer and sintering the charge layer with a sintering machine to produce a sintered ore,
The raw material charging device includes a charging gate and a chute,
A measuring step for measuring a concentration of at least one of the iron-containing raw material, the sintered raw material, and the granulated sintered raw material;
Of the opening angle of the charging gate and the inclination angle of the chute with respect to the horizontal plane so that the charging density of the charging layer becomes a predetermined charging density using the component concentration measured in the measuring step An adjustment step of adjusting at least one;
A method for producing sintered ore.   The method for producing a sintered ore according to claim 1, wherein in the measuring step, at least a CaO component concentration is measured. At least iron-containing raw material, CaO-containing raw material, and a sintered raw material mixed with a coagulant are granulated, and the granulated sintered raw material is charged into a pallet truck from a raw material charging device of a sintering machine. Forming a layer and sintering the charge layer with a sintering machine to produce a sintered ore,
The raw material charging device includes a charging gate, a chute, and a magnetic brake,
A measuring step for measuring a concentration of at least one of the iron-containing raw material, the sintered raw material, and the granulated sintered raw material;
Using the component concentration measured in the measurement step, the charging gate opening degree, the angle of inclination of the chute with respect to the horizontal plane, and the charging so that the charging density of the charging layer becomes a predetermined charging density, An adjustment step of adjusting at least one of the magnetic forces of the magnetic brake;
A method for producing sintered ore.   The method for producing a sintered ore according to claim 3, wherein at least the component concentration of FeO is measured in the measuring step.   The firing according to claim 2, wherein, as the CaO component concentration measured in the measurement step increases, at least one of the opening degree of the charging gate and the inclination angle of the chute with respect to the horizontal plane is increased in the adjustment step. Production method of ore.   As the FeO component concentration measured in the measurement step increases, the adjustment step increases the opening of the charging gate, increases the inclination angle of the chute with respect to the horizontal plane, and weakens the magnetic force of the magnetic brake. 5. The method for producing a sintered ore according to claim 4, wherein at least one of the methods is performed.