JPWO2018151024A1 - Method of producing sintered ore - Google Patents

Abstract

The present invention provides a method for producing sintered ore which can produce a product sintered ore of which quality deterioration is suppressed using a sintering raw material containing iron ore and dust generated in an iron mill even if the concentration of the component fluctuates. A method of producing a sintered ore, comprising: sintering material obtained by blending at least an iron-containing material, a CaO-containing material, and a coagulant, and sintering the material with a sinter to produce a sintered ore. It has a measuring step of continuously measuring the concentration of at least one component of the sintering raw material and the granulated sintering raw material, and using the component concentration measured in the measuring step, the blending amount of the CaO-containing raw material, Adjustment of at least one of the compounding amount, the added amount of water, and the advancing speed of the pallet carriage of the sintering machine is performed.

Description

  The present invention relates to a method for producing sintered ore in which the compounding amount of a CaO-containing raw material or the like in a sintered raw material is adjusted. Specifically, the component concentration of the sintered raw material is continuously measured, and the component concentration is used The present invention relates to a method for producing sintered ore in which the amount of CaO-containing raw material etc. is adjusted.

In the blast furnace iron making process, at present, sintered ore, lump iron ore, pellets and the like are mainly used as an iron source as blast furnace raw materials. Here, sinter is not only iron ore having a particle size of 10 mm or less, but also other sources of iron such as various dusts generated in ironworks, CaO-containing raw materials such as limestone, quick lime and slag, silica stone and the like Add water using a drum mixer with SiO ₂ source consisting of serpentinite, dolomite, refined nickel slag etc., auxiliary material as MgO source, and solid fuel (carbon material) which is coagulated material consisting of coke breeze, anthracite etc. It is a kind of agglomerated ore which is mixed, granulated and fired.

In recent years, the iron concentration of iron ore contained in the sintering raw material, which is a raw material of sintered ore, is decreased, and instead, the concentration of gangue components such as SiO ₂ and Al ₂ O ₃ is increased. Also, the component concentration of iron ore produced is more unstable as the concentration of the component may differ from ship to ship at the time of import. Also with regard to various types of dust generated in a steelmaking plant, the variation of the amount of generation and the fluctuation of the component of the dust itself are large, and the component management as a sintering material is very difficult.

The fluctuation of the component concentration in the sintering material leads to the fluctuation of the component concentration of the product product sintered ore. For example, an increase in SiO ₂ generally causes a reduction in the reducibility of sinter, and an increase in Al ₂ O ₃ generally causes a decrease in the strength of sinter. For this reason, when the component of the sintering raw material deviates from the planned value, it is necessary to carry out operation adjustment and formulation adjustment to avoid the deterioration of the quality.

  In general, the concentration of components of sintered ore charged into the blast furnace is constantly managed for reasons such as the control of the grade of slag. If the basicity rises or alumina rises in the component concentration of the product sintered ore, the viscosity of the blast furnace slag rises, so it is necessary to raise the hot metal temperature to suppress the rise of the viscosity. The increase in viscosity of the blast furnace slag deteriorates the slag dischargeability at the lower part of the blast furnace, and obstructs the flow of gas, so the air permeability also deteriorates. For this reason, it is necessary to increase the blending amount of coke in order to raise the temperature of the hot metal and ensure the air permeability of the lower part of the blast furnace. As described above, when the component concentration of the blast furnace raw material largely deviates from the target component concentration due to the fluctuation of the component concentration of the product sintered ore, the blast furnace operation becomes unstable, and various measures are required.

In response to such problems, efforts have been made to grasp the quality of sintered raw materials. For example, Patent Document 1 focuses on the clay mineral contained in iron ore, and the content of clay mineral (kaolin: Al ₂ Si ₂ O ₅ (OH) ₄ ) in fine ore contained in iron ore is appropriate. The technique which improves the granulation property of a sintering raw material is disclosed by adjusting to a range.

  Patent Document 2 discloses a technique of measuring the FeO concentration of a product sintered ore and adjusting the coagulated material, granulated water, and the amount of exhaust air of the sintering raw material using the FeO concentration of the product sintered ore. Patent Document 3 also discloses a technique of measuring the FeO concentration of a product sintered ore of a product sintered ore and adjusting the amount of town gas blown in the sintering machine using the FeO concentration of the product sintered ore. There is.

  In Patent Document 4, a laser type component measuring machine is installed on a sintering machine, and the product is burned using the component concentration of the surface of the raw material charge layer loaded in the pallet measured using the component measuring machine. The technique which estimates the component density | concentration of a lump ore and adjusts the compounding quantity of a sintering raw material using this is disclosed.

Unexamined-Japanese-Patent No. 2003-049227 Japanese Patent Application Laid-Open No. 57-149433 JP, 2011-038735, A Japanese Patent Application Laid-Open No. 60-262926

  The technique disclosed in Patent Document 1 measures a certain amount of iron ore sample and measures the concentration of kaolin components off-line. As described above, it is possible to predict the concentration of the component of the sintered ore by measuring the component of the sintering material off-line, but it is caused by the fluctuation of the concentration of the component of the sintered material during the production of the sintered ore. It is difficult to cope with excess or deficiency of heat.

  The techniques disclosed in Patent Document 2 and Patent Document 3 are techniques for continuously measuring the FeO concentration of product sinter ore, but reflect the result of component analysis of product sinter ore in adjustment of the blending amount of sintering raw material The time lag is large, and it is difficult to quickly cope with the fluctuation of the component concentration of the sintering raw material during the production of sintered ore.

  Although the technology disclosed in Patent Document 4 estimates the component concentration of the product sintered ore from the component concentration of the surface of the raw material charge layer, the state of the raw material charge layer is determined by the charging device of the sintering material and the sintering Since it fluctuates with the water content of the raw material, the component concentration of the surface layer of the raw material charge bed also fluctuates. For this reason, the relationship between the component concentration of the surface of the charge layer and the component concentration of the product sintered ore is not uniform, and it is difficult to actually estimate the component concentration of the product sintered ore from the component concentration of the surface of the charge layer It is.

  The present invention has been made in view of the problems of the prior art as described above, and the object of the present invention is to use sintered raw materials including iron ore and dust generated in steelworks even if the concentration of the components fluctuates. An object of the present invention is to provide a method for producing a sintered ore capable of producing a product sintered ore with a small fluctuation in component concentration.

The features of the present invention for solving such problems are as follows.
(1) A method for producing a sintered ore, comprising: sintering raw material obtained by blending at least an iron-containing raw material, a CaO containing raw material, and a coagulating agent, and sintering the raw material with a sintering machine to produce sintered ore. The step of continuously measuring the concentration of at least one component of the iron-containing raw material, the sintering raw material and the granulated sintering raw material, and the blending of the CaO-containing raw material using the component concentration measured in the measuring step A method for producing sintered ore, comprising: adjusting at least one of the amount, the compounding amount of the coagulating material, the added amount of water, and the advancing speed of the pallet carriage of the sintering machine.
(2) An MgO-containing raw material is further blended into the sintering raw material, and in the adjustment step, using the component concentration measured in the measurement step, the blending amount of the CaO-containing raw material, the blending of the MgO-containing raw material The method according to (1), wherein at least one of the amount, the compounding amount of the coagulating material, the addition amount of the water, and the advancing speed of the pallet carriage of the sintering machine is adjusted.
(3) A sintered raw material containing at least an iron-containing raw material, a CaO-containing raw material and a coagulating agent is granulated, and the sintered raw material is sintered while supplying the gaseous fuel and oxygen by a sintering machine A method for producing a sintered ore to be produced, comprising a measuring step of continuously measuring the concentration of at least one component of the iron-containing raw material, the sintering raw material and the granulated sintering raw material, Using the measured component concentration, the blending amount of the CaO-containing raw material, the blending amount of the coagulating material, the added amount of water, the advancing speed of the pallet truck of the sintering machine, the supplied amount of gaseous fuel and the supplied amount of oxygen And at least one adjustment step of adjusting.
(4) An MgO-containing raw material is further blended into the sintering raw material, and in the adjustment step, using the component concentration measured in the measurement step, the blending amount of the CaO-containing raw material, the blending of the MgO-containing raw material The method according to (3), wherein at least one of the amount, the compounding amount of the coagulating material, the addition amount of the water, the advancing speed of the pallet carriage of the sintering machine, the supply amount of gaseous fuel and the supply amount of oxygen is adjusted. Method of producing sintered ore.
(5) In the measurement step, the concentration of one or more components of total CaO, SiO ₂ , MgO, Al ₂ O ₃ , FeO, C and water is measured, in any one of (1) to (4) The manufacturing method of the sinter described above.

  A product in which the fluctuation of the component concentration is small and the deterioration of the quality is suppressed by using the sintering raw material containing iron ore having a large fluctuation of the component concentration and the dust generated in the steelworks Sinter can be produced.

FIG. 1: 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 this embodiment. FIG. 2 is a graph showing the basicity of the sintering raw material of the invention example 1 and the fluctuation of the drop strength of the product sintered ore 72. FIG. 3 is a graph showing the basicity of the sintering raw material of Comparative Example 1 and the drop strength of the product sintered ore 72. FIG. 4 is a graph showing fluctuations in the production rate of the sintering machine of invention example 2, the carbon concentration of the sintering raw material, and the traveling speed of the pallet carriage. FIG. 5 is a graph showing fluctuations in the production rate of the sintering machine of Comparative Example 2, the carbon concentration of the sintering raw material, and the traveling speed of the pallet carriage.

  Hereinafter, the present invention will be described through embodiments of the invention. FIG. 1: 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 this embodiment. The iron-containing raw material 12 stored in the yard 11 is transported to the blending tank 22 by the transport conveyor 14. The iron-containing raw material 12 contains various grades of iron ore and dust generated in a steel mill.

  The raw material supply unit 20 includes a plurality of mixing tanks 22, 24, 25, 26, 28. The iron-containing raw material 12 is stored in the mixing tank 22. A CaO-containing raw material 16 containing limestone, quicklime, etc. is stored in the mixing tank 24, and an MgO-containing raw material 17 containing dolomite, refined nickel slag, etc. is stored in the mixing tank 25, respectively. In the compounding tank 26, a coagulated material 18 containing powdered coke and anthracite which are crushed to a particle size of 1 mm or less using a rod mill is stored. In the mixing tank 28, returned ore (sintered ore sieving powder) having a particle size of 5 mm or less, which is under the screen of sintered ore, is stored. Predetermined amounts of the respective raw materials are cut out from the mixing tanks 22 to 28 of the raw material supply unit 20, and these are mixed to be sintered raw materials. The sintering material is conveyed by the conveyance conveyor 30 to the drum mixer 36. The MgO-containing raw material 17 is an optional compounding raw material, and may or may not be compounded with the sintering raw material.

An infrared analyzer 32 is provided on the transfer conveyor 30 between the mixing tank 28 and the drum mixer 36. The measurement process is performed using the infrared analyzer 32. In the measurement step, concentration of one or more components of total CaO, SiO ₂ , MgO, Al ₂ O ₃ , FeO, C and water contained in the sintering raw material is measured. Here, the water content is a combination of the attached water content adhering to the sintering material and the specific water contained in the material under constant temperature conditions and expelled by heating.
The infrared analyzer 32 irradiates the sintering raw material with infrared light having a wavelength in the range of 0.5 to 50.0 μm, and receives the reflected light from the sintering raw material. Since the respective molecular vibrations of total CaO, SiO ₂ , MgO, Al ₂ O ₃ , FeO, and water contained in the sintering material absorb the inherent wavelength components of the irradiated infrared radiation, these components become reflected infrared radiation. Assign unique wavelength components. The crystal structure of monoatomic molecules such as carbon (C) also begins to vibrate upon irradiation with infrared light, and imparts a unique wavelength component to the reflected infrared light. For this reason, the component concentration of total CaO, SiO ₂ , MgO, Al ₂ O ₃ , FeO, C and moisture in the sintering raw material can be measured by analyzing the irradiation infrared radiation and the reflection infrared radiation. Total CaO is obtained by converting Ca in all compounds having Ca and O such as CaO, CaCO ₃ , Ca (OH) ₂ , Fe ₂ CaO _4, etc. into CaO.

  The infrared analyzer 32 emits infrared light of 20 or more wavelengths, for example, at a frequency of 128 times per minute to receive the reflected light reflected by the sintering material. Thus, since infrared rays can be irradiated in a short time, the infrared analyzer 32 can measure the component concentration of the sintering raw material conveyed on the conveyance conveyor 30 continuously on-line. The infrared analyzer 32 is an example of an analyzer for measuring the component concentration of the sintering raw material, and instead of the infrared analyzer 32, a laser analyzer which irradiates a laser to the measurement object, a neutron analysis which irradiates neutron to the measurement object It is also possible to use a meter or a microwave analyzer that irradiates the object to be measured with microwaves.

  The sintering raw material conveyed to the drum mixer 36 is supplied to the drum mixer 36, and an appropriate amount of water 34 is added thereto to granulate into, for example, pseudo particles having an average particle diameter of 3.0 to 6.0 mm. The granulated sintering raw material is conveyed by the conveying conveyor 38 to the sintering raw material supply device of the sintering machine 40. The drum mixer 36 is an example of a granulating apparatus for granulating the sintering material, and there may be a plurality of drum mixers 36. Instead of the drum mixer 36, a pelletizer granulator may be used. Both the drum mixer 36 and the pelletizer granulator may be used, or a high speed stirrer may be installed upstream of the drum mixer 36 to agitate the sinter material. In the present embodiment, the average particle size is an arithmetic average particle size, and Σ (Vi × di) (where Vi is an abundance ratio of particles in the i-th particle size range, and di is the i-th particle size It is a particle size defined by the above.

Using the component concentration of the sintering raw material measured in the measurement step, the blending amount of the CaO-containing raw material 16, the blending amount of the coagulating material 18, and the water added by the drum mixer 36 so as to reach the predetermined target value An adjustment step is performed to adjust at least one of the 34 addition amounts. The predetermined target value is, for example, basicity (CaO / SiO ₂ ) of sintering raw material, carbon concentration of sintering raw material, MgO concentration, water concentration, Al ₂ O ₃ concentration or heat quantity at sintering These target values may be determined in advance using, for example, past production results of sintered ore. When the MgO-containing raw material 17 is blended, the blending amount of the MgO-containing raw material 17 may be adjusted by using the component concentration of the sintering raw material measured in the measurement step in the adjustment step.

  In the present embodiment, the measurement frequency of the component concentration by the infrared analyzer 32 is 128 times in 1 minute, and the average value of the 128 component concentrations is calculated once in 1 minute, and the calculated average value of the component concentrations The blending step of the blast furnace raw material was carried out every one minute using.

Even if the component concentration of the gangue component of iron ore fluctuates by this adjustment step, for example, the basicity of the sintering raw material (CaO / SiO) can be obtained using the component concentration of the sintering raw material measured in the measurement step. By feedback controlling the blending amount of the CaO-containing raw material 16 so that ₂ ) becomes a predetermined target value, the fluctuation of the basicity (CaO / SiO ₂ ) of the sintering raw material becomes small.

  Even if the carbon concentration of the dust generated in the steelworks fluctuates, using the carbon concentration of the sintering raw material measured in the measurement step, the coagulated material so that the carbon concentration of the sintering raw material becomes a predetermined target value The feedback control of the compounding amount of 18 reduces the fluctuation of the carbon concentration in the sintering material.

  Even if the water concentration of iron ore and dust generated in the ironworks fluctuates, the water to be added by the drum mixer 36 from the water concentration of the sintering raw material measured in the measurement step and the predetermined target water concentration. It becomes possible to perform feedforward control which determines the addition amount of 34. And the water 34 of the water quantity adjusted by the said control is added by the drum mixer 36, and it can adjust the water concentration of a sintering raw material to the target water concentration.

  The sintering machine 40 is, for example, a lower suction type dwite toroid sintering machine. The sintering machine 40 includes a sintering raw material supply device 42, an endless moving pallet carriage 44, an ignition furnace 46, a gaseous fuel supply device 47, and a window box 48. The sintering raw material is charged into the pallet carriage 44 from the sintering raw material supply device 42, and a charging bed of the sintering raw material is formed. The bed is ignited in an ignition furnace 46. By suctioning air through the wind box 48, the charge bed takes in the gas fuel and oxygen supplied from the gas fuel supply device 47 provided above to the charge bed, and condenses the gas fuel and the charge in the charge bed. The combustion / melting zone in the bed is moved downward of the bed while burning the material 18. The sintering bed is thereby sintered to form a sintered cake. In the present 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 mixtures thereof. Is any flammable gas.

  Using the component concentration of the sintering raw material measured in the measurement step, the advancing speed of the pallet carriage 44 in the sintering machine 40, the supply amount of gaseous fuel on the sintering machine and the supply amount of oxygen on the sintering machine And at least one adjustment may be made.

  The sinter cake is crushed by a crusher 50 and made into sintered ore. The sintered ore crushed in the crusher 50 is cooled by the cooler 60. The sintered ore cooled by the cooler 60 is sieved by a sieving apparatus 70 having a plurality of sieves and sifted into a product 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 Be done. The product sintered ore 72 is transported by the transport conveyor 76 to the blast furnace 80 and charged into the blast furnace as a blast furnace raw material. On the other hand, the return ore 74 is transported by the transport conveyor 78 to the blending tank 28 of the raw material supply unit 20. The product sinter ore 72 is obtained by cooling and sieving the sinter ore crushed by the crusher 50, so the product sinter ore 72 and the sinter ore crushed by the crusher 50 have the same components. It is a sinter of concentration. In the present embodiment, the particle size of the product sintered ore 72 and the particle size of the return ore 74 mean the particle size to be sieved by a sieve, for example, a particle size of more than 5 mm means using a sieve with an aperture of 5 mm. The particle size to be sieved on a sieve, and the particle size of 5 mm or less is the particle size to be sieved under a sieve using a sieve with an aperture of 5 mm. Each value of the particle size of the product sintered ore 72 and return ore 74 is just an example, and is not limited to this value.

  As described above, in the method for producing sintered ore according to the present embodiment, the concentration of the component measured by the infrared analyzer 32 in the measurement step is used to blend the CaO-containing raw material 16 so as to achieve a predetermined target value. An adjustment step of adjusting at least one of the amount, the blending amount of the coagulating material 18 and the addition amount of the water 34 added by the drum mixer 36 is performed. Thereby, the fluctuation of the component concentration of the sintering raw material becomes small, and the fluctuation of the component concentration of the product sintered ore 72 manufactured using the sintering raw material also becomes small, and as a result, the quality of the product sintered ore 72 decreases. Can be suppressed.

For example, in the adjusting step, using the concentrations of CaO and SiO ₂ measured in the measuring step, the basicity (CaO / SiO ₂ ) of the sintering raw material reaches a predetermined target value. The amount may be adjusted. As a result, even if iron ore having a large fluctuation in the concentration of the constituents of the gangue component is used, the fluctuation in basicity (CaO / SiO ₂ ) of the sintering raw material becomes smaller, and the product baked using the sintering raw material The variation in basicity of the consolidated ore 72 is also reduced, and the production of a stable product sintered ore 72 becomes possible. By using the product sintered ore 72 having a small variation in basicity as a blast furnace raw material, it can also contribute to the stable operation of the blast furnace.

  When the variation of the carbon concentration of the sintering raw material is large, the variation of the heat quantity at the time of sintering becomes large, whereby the variation of the FeO concentration of the product sintered ore 72 also becomes large. As described above, when the fluctuation of the FeO concentration becomes large, the blending amount of the condensing material 18 and the supply of the gaseous fuel on the sintering machine so that the heat quantity at the time of sintering becomes a predetermined target value in the adjustment step. At least one of the amount and the supply of oxygen on the sintering machine may be adjusted. Thereby, the variation of the heat quantity at the time of sintering becomes small, and the variation of the FeO concentration of the product sintered ore 72 also becomes small.

  You may adjust the addition amount of the water 34 added with the drum mixer 36 using the manufacturing method of the sintered ore which concerns on this embodiment. By adjusting the addition amount of the water 34 so as to achieve a predetermined target value of the water concentration, the fluctuation of the water concentration of the sintering raw material becomes smaller, and the fluctuation of the heat quantity at the time of sintering becomes even smaller. Thereby, the fluctuation of the FeO concentration of the product sintered ore 72 is further reduced.

  The FeO concentration of the product sintered ore 72 fluctuates, and when the FeO concentration increases, the reducibility of the blast furnace raw material deteriorates. When the reducibility of the blast furnace raw material deteriorates, the indirect reduction which is an exothermic reaction decreases, the direct reduction which is an endothermic reaction increases, and the heat in the blast furnace becomes insufficient. In order to eliminate this heat shortage, the reducing material is further charged into the blast furnace, and the coke ratio in blast furnace operation is increased. Therefore, by controlling the FeO concentration of the product sintered ore 72 to the target component concentration, it is possible to suppress the increase of the coke ratio in the blast furnace operation.

  When the amount of heat during sintering increases and the temperature of the sintered cake rises, the cooler 60 is overloaded. Therefore, when an increase in the carbon concentration of the sintering material is confirmed in the measurement step, the advancing speed of the pallet carriage 44 of the sintering machine is reduced when the sintering material is sintered by the sintering machine 40. May be Thereby, the load of the cooler 60 can be reduced. In the measurement process of the present embodiment, since the component concentration of the sintering material is continuously measured online, it is possible to grasp a sudden increase in carbon concentration. By reducing the advancing speed of the pallet carriage 44 of the sintering machine according to the increase of the carbon concentration, it is possible to prevent the damage of the equipment due to the temperature rise of the sintering cake.

  When the MgO-containing raw material 17 is blended in the sintering raw material, the MgO-containing raw material 17 is made to have a predetermined target value of MgO concentration using the MgO concentration measured by the infrared analyzer 32 in the measurement step. The compounding amount of may be adjusted. Thereby, the fluctuation of the component concentration of MgO of the product sintered ore 72 is also reduced. The MgO component in the product sintered ore 72 has the effect of increasing the melting point and improving the softening and melting properties. Therefore, by reducing the fluctuation of the MgO component concentration of the product sintered ore 72, the effect of improving the softening and melting properties can be obtained, which can contribute to the stable operation of the blast furnace.

  In the present embodiment, an example of producing a sintered ore using the sintering machine 40 having the gaseous fuel supply device 47 has been shown, but the present invention is not limited to the sintering machine 40 having the gaseous fuel supply device 47, and a gaseous fuel supply device The invention is applicable even to a sintered ore producing apparatus having a sintering machine not having 47. When using the sintering machine which does not have the gaseous fuel supply apparatus 47, the compounding quantity of the CaO containing raw material 16, the compounding quantity of the coagulating material 18, the addition quantity of water 34 using the component density | concentration measured at the measurement process And at least one of the traveling speeds of the pallet carriage 44 of the sintering machine. That is, in the present embodiment, the supply of the gaseous fuel and oxygen in the sintering machine 40 may be performed as necessary, and the adjustment of the supply amount of the gaseous fuel and / or the supply amount of oxygen in the adjustment step may also be performed as necessary. You can do it.

In the present embodiment, the infrared analyzer 32 is provided on the transport conveyor 30 between the mixing tank 28 and the drum mixer 36 to measure the component concentration of the sintering material, but the invention is not limited thereto. An infrared analyzer 32 is provided on the transport conveyor 14 and one or more components of total CaO, SiO ₂ , MgO, Al ₂ O ₃ , FeO, C, and moisture contained in the iron-containing raw material 12 transported to the mixing tank 22 The concentration may be measured, and the infrared analyzer 32 is provided on the transport conveyor 30 between the blending tank 22 and the blending tank 24 so that the total CaO and SiO ₂ contained in the iron-containing raw material 12 carried out of the blending tank 22 The concentration of one or more components of MgO, Al ₂ O ₃ , FeO, C and water may be measured. The factor that the component concentration of the sintering raw material fluctuates is largely influenced by the fluctuation of the component concentration of iron ore of various grades contained in the iron-containing raw material 12 stored in the yard 11 and the dust generated in the steel mill. Therefore, the infrared ray analyzer 32 is provided on the transport conveyor 14, the component concentration of the iron-containing raw material 12 is measured, and the CaO-containing raw material 16 is compounded using the measured value and the component concentration of the target sintered raw material. Feed-forward control is possible to determine at least one of the amount, the amount of the mixed material 18 and the amount of the water 34 added, which makes it possible to reduce the concentration fluctuation of each component of the sintering material. An infrared analyzer 32 is provided on the transport conveyor 14 to measure the component concentration of the iron-containing raw material 12, and using the measured values, the traveling speed of the pallet carriage 44 of the sintering machine, the gaseous fuel on the sintering machine and / or By adjusting the supply amount of oxygen, it is possible to suppress the adverse effect due to the fluctuation of the heat quantity at the time of sintering.

The infrared analyzer 32 is provided on the transport conveyor 38, and one of the total CaO, SiO ₂ , MgO, Al ₂ O ₃ , FeO, C and moisture contained in the granulated sintering raw material transported to the sintering machine 40 The concentration of components above the species may be measured. The granulated sintering raw material is uniformly mixed by the drum mixer 36, and each raw material is not segregated, so that the component concentration of the sintering raw material can be measured with high accuracy. And, by feedback control of at least one of the compounding amount of the CaO-containing raw material 16, the compounding amount of the coagulating material 18 and the addition amount of the water 34 using the concentration of the component, the concentration fluctuation of each component of the sintering material is reduced. it can. Furthermore, the advancing speed of the pallet carriage 44 of the sintering machine and the supply amount of the gaseous fuel and / or oxygen may be adjusted using the measured value, whereby the adverse effect due to the variation of the heat quantity at the time of sintering can be suppressed. .

  In this embodiment, each raw material is cut out from the compounding tank 22-28 of the raw material supply part 20, made into the sintering raw material by the conveyance conveyor 30, and the example made into the sintering raw material granulated by the drum mixer 36 was shown It is not limited to. For example, a sintered raw material containing iron-containing raw material 12, CaO-containing raw material 16 and return ore 74 is charged into drum mixer 36, water is added to the sintered raw material, and granulation is carried out. The carbonaceous material exterior particles in which the coagulating material 18 is present in the surface layer may be used as a granulated sintering raw material by adding. In this case, the infrared analyzer 32 is used to measure the concentration of at least one of the iron-containing raw material 12 and the sintering raw material, and using the measured values, the blending amount of the CaO-containing raw material 16, the coagulated material 18 The amount of water 34 added, the advancing speed of the pallet carriage 44 of the sintering machine, the supplied amount of gaseous fuel, and the supplied amount of oxygen are adjusted.

  A sintered material containing iron-containing material 12, CaO-containing material 16, return ore 74, and a part of coagulating material 18 is charged into drum mixer 36, water is added to the sintered material, and granulation is carried out. By charging the remaining portion of the coagulating material 18 in the second half of the hour, the carbon material exterior particles in which the coagulating material 18 is present in the surface layer of the granulated sintering material may be used as the granulated sintering material. Powdered coke and anthracite are used as a coagulating material to which water is added and which is mixed in the second half of granulation.

  In the case where a plurality of drum mixers 36 are provided, and in the case of using a carbon material exterior particle in which the coagulating material 18 is present in the surface layer, a part or all of the coagulating material 18 is introduced in the second half of the last drum mixer 36 The carbonaceous material exterior particles in which the coagulating material 18 is present in the surface layer may be granulated by charging the sintering material into the drum mixer 36 by the method described above. Furthermore, when a plurality of drum mixers 36 are provided, all the water may be added to the sintering raw material by the first drum mixer 36, and a part of the water may be added by the first drum mixer 36. May be added, and the remainder may be added by another drum mixer 36.

  In this embodiment, each raw material is cut out from the compounding tank 22-28 of the raw material supply part 20, made into the sintering raw material by the conveyance conveyor 30, and the example made into the sintering raw material granulated by the drum mixer 36 was shown It is not limited to. For example, a sintered raw material containing iron-containing raw material 12 and return ore 74 is charged into drum mixer 36, water is added to the sintered raw material and granulated, and CaO-containing raw material 16 or CaO containing raw material in the latter half of granulation Granulated particles in which the CaO-containing raw material 16 or the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer may be used as the granulated sintering raw material by charging 16 and the coagulating material 18. In this case, the infrared analyzer 32 is used to measure the concentration of at least one of the iron-containing raw material 12 and the sintering raw material, and using the measured values, the blending amount of the CaO-containing raw material 16, the coagulated material 18 Adjust at least one of the blending amount of water, the added amount of water 34, the advancing speed of the pallet carriage 44 of the sintering machine, the supply amount of gaseous fuel on the sintering machine and the supply amount of oxygen on the sintering machine Do.

  Sintered raw materials containing iron-containing raw material 12, return ore 74, a part of CaO-containing raw material 16 or a part of CaO-containing raw material 16 and a part of coagulating material 18 are charged into drum mixer 36 to sinter raw material Water is added and granulated, and the remaining part of the CaO-containing raw material 16 and the remaining part of the coagulating material 18 are compounded in the latter half of granulation, so that the CaO-containing raw material 16 and the coagulating material 18 are formed on the surface of the granulated sintering raw material. Granulated particles present may be used as a granulated sintering material.

  In the case of providing a plurality of drum mixers 36 and granulating particles in which the CaO-containing raw material 16 or the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer, part or all of the CaO-containing raw material Granulated particles in which the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer by charging the sintering material 16 and the coagulating material 18 in the latter half of the last drum mixer 36 and injecting the sintering material into the drum mixer 36 by the method described above May be granulated.

  In this embodiment, although the example which cuts out each raw material from the mixing tanks 22-28 of the raw material supply part 20 and makes it the sintering raw material by the conveyance conveyor 30 was shown, it is not restricted to this. For example, a portion of each raw material cut out from the mixing tanks 22 to 28 of the raw material supply unit 20 is directly transported to the drum mixer 36 by the transport conveyor 30, and the remaining portion is transported to the high speed stirring device by the transport conveyor different from the transport conveyor 30. Stir and treat. Thereafter, the remaining portion may be granulated by a granulator such as a drum mixer or a pelletizer, and if necessary, may be dried by a drier, and then introduced into the conveyer 30 or the conveyer 38. The said remainder may be thrown into the conveyance conveyor 30 directly, without being granulated with granulators, such as a drum mixer or a pelletizer, after stirring processing. Furthermore, a crushing step and / or a sieving step may be provided before being subjected to the stirring process with the high speed stirring device. When a plurality of drum mixers 36 are present, they may be loaded on the transport conveyor between any drum mixers.

  In this embodiment, although the example which provided the infrared rays analyzer 32 in the measurement process in the conveyance conveyor 30 between the mixing tank 28 and the drum mixer 36 was shown, it is not restricted to this. For example, the transport analyzer 14 between the yard 11 and the most entry side blending tank 22 of the infrared analyzer 32, the transport conveyor 30 between the blending tank 22 and the blending tank 24, or the drum mixer 36 and the sintering machine 40 , And may be provided on the transport conveyor 38 between them. However, when using the granulated material in which the coagulating material 18 or the CaO-containing raw material 16 and the coagulating material 18 are present in the surface layer, the surface layer component may affect the measurement of the component concentration. It is more preferable to provide the infrared analyzer 32 on the transfer conveyor 30 between the mixing tank 22 and the mixing tank 24 or on the transfer conveyor 30 between the mixing tank 28 and the drum mixer 36.

  A plurality of infrared analyzers 32 in the measurement step may be provided without being limited to one, and the transport conveyor 14, the transport conveyor 30 between the blending tank 22 and the blending tank 24, the transport conveyor 30 between the blending tank 28 and the drum mixer 36 And the transfer conveyor 38 may be provided with two or more infrared analyzers. The concentration of two or more components of the sintering raw material, the iron-containing raw material 12 and the granulated sintering raw material is measured using a plurality of infrared analyzers, and the amount of the CaO-containing raw material 16 blended using the measured values. At least one of the amount of the condensing material 18, the amount of water 34 added, the advancing speed of the pallet carriage 44 of the sintering machine, the amount of gaseous fuel supplied on the sintering machine and the amount of oxygen supplied on the sintering machine You may adjust one.

Example 1
A product sinter was produced using the sinter producing apparatus 10 shown in FIG. In the invention example 1, the component concentration of the sintering material is continuously measured using the infrared analyzer 32 provided on the transport conveyor 30, and the basicity (CaO / SiO ₂ ) of the sintering material is measured using the measured component concentration. The product sintered ore was manufactured for 36 hours while adjusting the blending amount of the CaO-containing raw material 16 so that the basicity (CaO / SiO ₂ ) targeted by the above becomes the target. On the other hand, in Comparative Example 1, the component concentration of the sintering material is measured every two hours, not continuously but off line, and the basicity (CaO / SiO ₂ ) of the sintering material is targeted using the measured component concentration. A product sintered ore was manufactured for 36 hours while adjusting the blending amount of the CaO-containing raw material 16 so as to obtain the basicity (CaO / SiO ₂ ).

FIG. 2 is a graph showing the basicity of the sintering raw material of the invention example 1 and the fluctuation of the drop strength of the product sintered ore. FIG. 3 is a graph showing the basicity of the sintering raw material of Comparative Example 1 and the drop strength of the product sintered ore. The basicity shown in FIGS. 2 (a) and 3 (a) is obtained by dividing the total CaO concentration in the sintering material by the SiO ₂ concentration. The drop strength shown in FIGS. 2 (b) and 3 (b) is the strength measured using the drop strength test method defined in JIS M 8711.

  As shown in FIGS. 2 (a) and 2 (b), in the invention example 1, the deviation from the target value of the basicity of the sintering raw material became smaller, and the fluctuation of the drop strength of the product sintered ore also became smaller. In the invention example 1, the component concentration of the sintering raw material is continuously measured. For this reason, even if the concentration of the component suddenly changes, the variation of the concentration of the component can be detected early, and the blending amount of the CaO-containing raw material 16 can be adjusted early so that the concentration of the component becomes the target value. . Thereby, in the invention example 1, the shift | offset | difference from the target value of the basic material of sintering raw material and the fluctuation | variation of basicity were able to be made small, and the fluctuation | variation of the drop strength of product sinter was also made small.

  On the other hand, as shown in FIGS. 3 (a) and 3 (b), in Comparative Example 1, the basicity of the sintering raw material largely fluctuates with respect to the target value, and the drop strength of the product sintered ore also largely fluctuates. Low-grade product sinter was produced. When the fall strength of the product sintered ore becomes low, it is easily crushed by the impact at the time of transportation and charging to the blast furnace, and the particle size of the product sintered ore fluctuates. The particle size variation of the product sintered ore is not preferable because it becomes a factor of disturbance of the raw material charge distribution in the blast furnace.

From these results, it was confirmed that by using the production method of the invention example 1, it is possible to produce a product sintered ore with less fluctuation of component concentration of the product sintered ore and fluctuation of the drop strength.
(Example 2)
A product sinter was produced using the sinter ore producing apparatus 10 shown in FIG. 1 in both the invention example 2 and the comparative example 2. In the invention example 2, the carbon concentration of the sintering raw material is continuously measured using the infrared analyzer 32 provided on the transport conveyor 30, and the carbon concentration of the sintering raw material is made the target concentration using the measured carbon concentration. The product sintered ore was manufactured for 36 hours while adjusting the blending amount of the condensing material 18 as follows. On the other hand, in Comparative Example 2, the carbon concentration of the sintering material is measured every four hours not continuously but offline so that the carbon concentration of the sintering material becomes the target concentration using the measured carbon concentration. The product sintered ore was manufactured for 36 hours while adjusting the content of the condensing material 18 in the above. The target value of the carbon concentration of the sintering material is calculated by using the components of the sintering material to calculate the sintering temperature at which the liquid phase ratio of the sintering material becomes a preferable range at the time of sintering, and burning the carbon It was determined based on the amount of carbon that can be raised to the sintering temperature. In both Inventive Example 2 and Comparative Example 2, the sintering raw material is changed to a sintering raw material having a high carbon concentration during the production of the product sintered ore, and thereafter, the sintered raw material is returned to continue production of the product sintered ore did.

FIG. 4 is a graph showing fluctuations in the production rate of the sintering machine of invention example 2, the carbon concentration of the sintering raw material, and the traveling speed of the pallet carriage. FIG. 5 is a graph showing fluctuations in the production rate of the sintering machine of Comparative Example 2, the carbon concentration of the sintering raw material, and the traveling speed of the pallet carriage. FIG. 4A and FIG. 5A show the fluctuation of the production rate (t / (h × m ² )) of the sintering machine. The production rate (t / (h × m ² )) of the sintering machine is the mass (t) of sintered cake produced per hour by the sintering machine divided by the area (m ² ) of the pallet carriage It is a value calculated by FIG.4 (b) and FIG.5 (b) show the fluctuation | variation of the carbon concentration (mass%) of sintering raw material. FIG.4 (c) and FIG.5 (c) show the fluctuation | variation of the advancing speed (m / min) of a pallet trolley. The part enclosed by the broken line frame in both FIG. 4 and FIG. 5 shows the “raw material change period” changed to the sintering raw material having a high carbon concentration.

  In the invention example 2, the carbon concentration of the sintering raw material is continuously measured, and the compounding amount of the coagulating material 18 is adjusted so that the carbon concentration becomes a target value. Thus, since the component concentration of the sintering raw material is continuously measured, an increase in carbon concentration can be detected at the beginning of the raw material change period, and the carbon concentration targeted by the carbon concentration of the sintering raw material is targeted using the concentration. As a result, adjustment of the blending amount of the coagulating material 18 was carried out early. Thereby, as shown in FIG.4 (b), the raise of the carbon concentration of sintering raw material is suppressed, and as shown in FIG.4 (c), a sintered ore is manufactured, without reducing the advancing speed of a pallet truck. As a result, as shown in FIG. 4 (a), a large decrease in the production rate of the sintering machine 40 did not occur.

  On the other hand, in Comparative Example 2, since the carbon concentration of the sintering material is not continuously measured, the detection of the increase in the carbon concentration of the sintering material is delayed. Therefore, as shown in FIG. 5 (b), the carbon concentration of the sintering raw material is greatly increased. If the temperature of the sinter cake becomes too high due to the increase of the carbon concentration, the cooler 60 is overloaded, so it is necessary to reduce the traveling speed of the pallet truck to reduce the load of the cooler 60. For this reason, as shown in FIG. 5 (c), the traveling speed of the pallet carriage is reduced, and as a result, as shown in FIG. 5 (a), the production rate of the sintering machine 40 is greatly reduced.

  As described above, by using the manufacturing method of the invention example 2, even if the carbon concentration of the sintering raw material fluctuates, the fluctuation of the carbon concentration is detected at an early stage, and the condensation starts at an early stage corresponding to the fluctuation of the carbon concentration. The blending amount of the material 18 can be adjusted. Thereby, the variation of the carbon concentration of the sintering raw material becomes small and the variation of the heat quantity at the time of producing the sintered ore also becomes small. As a result, the temperature rise of the product sintered ore is suppressed and the production rate of the sintering machine 40 It has been confirmed that the decrease is suppressed.

DESCRIPTION OF SYMBOLS 10 sintered ore manufacturing apparatus 11 yards 12 iron containing raw material 14 conveyer 16 CaO containing raw material 17 MgO containing raw material 18 coagulating 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 Conveying conveyor 40 Sintering machine 42 Sintered raw material supply device 44 Pallet truck 46 Ignition furnace 47 Gas fuel supply device 48 Window box 50 Crusher 60 Cooler 70 Sieving device 72 Sintered product ore 74 Returning 76 Transport conveyor 78 Transport conveyor 80 Blast furnace

Claims (5)

Water is added to a sintering raw material containing at least an iron-containing raw material, a CaO-containing raw material and a coagulating agent, water is added and granulated, and a method of producing a sintered ore is produced by sintering in a sintering machine to produce sintered ore. ,
Measuring the concentration of at least one of the iron-containing material, the sintering material and the granulated sintering material continuously;
Adjustment of at least one of the compounding amount of the CaO-containing raw material, the compounding amount of the coagulating material, the addition amount of the water, and the advancing speed of the pallet carriage of the sintering machine using the component concentration measured in the measuring step Adjustment process to
A method of producing sintered ore, comprising An MgO-containing material is further blended in the sintering material.
In the adjustment step, using the component concentration measured in the measurement step, the blending amount of the CaO-containing raw material, the blending amount of the MgO-containing raw material, the blending amount of the coagulating material, the addition amount of the water, and the sintering The method for producing sinter ore according to claim 1, wherein at least one of the traveling speeds of the pallet carriages of the machine is adjusted. Water is added to a sintered material containing at least an iron-containing material, a CaO-containing material, and a coagulant to granulate, and the above-mentioned sintered material is sintered and sintered while supplying gaseous fuel and oxygen by a sintering machine A method of producing sintered ore for producing ore,
And measuring the concentration of at least one of the iron-containing material, the sintering material, and the granulated sintering material continuously.
Using the component concentration measured in the measurement step, the blending amount of the CaO-containing raw material, the blending amount of the coagulating material, the addition amount of the water, the advancing speed of the pallet carriage of the sintering machine, the supply of the gaseous fuel Adjusting at least one of the amount and the supply amount of oxygen;
A method of producing sintered ore, comprising An MgO-containing material is further blended in the sintering material.
In the adjustment step, using the component concentration measured in the measurement step, the blending amount of the CaO-containing raw material, the blending amount of the MgO-containing raw material, the blending amount of the coagulating material, the addition amount of the water, the sintering The method for producing sintered ore according to claim 3, wherein at least one of the traveling speed of the pallet carriage of the machine, the supply amount of the gaseous fuel and the supply amount of the oxygen is adjusted. Wherein the measuring step, the total _{CaO, SiO 2, MgO, Al} 2 O 3, FeO, measuring one or more component concentrations of C and water, baked according to any one of claims 1 to 4 How to make a lump ore.

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