JP6874780B2 - Sintered ore manufacturing method - Google Patents

Sintered ore manufacturing method Download PDF

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JP6874780B2
JP6874780B2 JP2019034406A JP2019034406A JP6874780B2 JP 6874780 B2 JP6874780 B2 JP 6874780B2 JP 2019034406 A JP2019034406 A JP 2019034406A JP 2019034406 A JP2019034406 A JP 2019034406A JP 6874780 B2 JP6874780 B2 JP 6874780B2
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裕起 永山
裕起 永山
侯寿 森
侯寿 森
友司 岩見
友司 岩見
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Description

本発明は、焼結原料を焼結機のパレット台車に装入することで形成される装入層の状態を調整して焼結鉱を製造できる焼結鉱の製造方法に関する。 The present invention relates to a method for producing sinter, which can produce sinter by adjusting the state of the charging layer formed by charging the sinter raw material into the pallet carriage of the sinter.

高炉製鉄法では、現在、鉄源として、焼結鉱や塊鉄鉱石、ペレットなどを高炉原料に用いている。ここで、焼結鉱は、粒径が１０ｍｍ以下の鉄鉱石の他に、製鉄所内で発生するダスト、スラッジ、返鉱等などの雑鉄源と、石灰石、生石灰、スラグなどのＣａＯ含有原料と、珪石や蛇紋岩、ドロマイトや精錬ニッケルスラグなどからなるＳｉＯ２源やＭｇＯ源としての副原料と、粉コークスや無煙炭などからなる凝結材である固体燃料（炭材）と含む焼結原料を、ドラムミキサーで水を添加しながら混合・造粒し、焼結した塊成鉱の一種である。 In the blast furnace ironmaking method, sintered ore, lump iron ore, pellets, etc. are currently used as blast furnace raw materials as iron sources. Here, the sintered ore includes 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 iron mill, and CaO-containing raw materials such as limestone, quicklime, and slag. , Sinter raw material containing a SiO 2 source consisting of iron ore, serpentine, dolomite, refined nickel slag, etc., an auxiliary raw material as an MgO source, and a solid fuel (charcoal material), which is a coagulant made of coke breeze, smokeless coal, etc. It is a type of agglomerate ore that is mixed and granulated while adding water with a drum mixer and sintered.

焼結原料は、焼結機のパレット台車に装入されて装入層が形成される。装入層の層厚や装入密度は、焼結時の通気性に大きく影響し、焼結鉱の品質、生産性および歩留りを左右する。特に、シュートに磁気ブレーキが設けられた焼結機を用いる場合、焼結原料に含まれるＦｅＯによって焼結原料の装入速度が変化する。このため、装入層の装入状態を予制御するには、磁気ブレーキの磁束密度の調整を行うことが必要になる。 The sintering raw material is charged into the pallet carriage of the sintering machine to form an charging layer. The layer thickness and charging density of the charging layer greatly affect the air permeability during sintering, and affect the quality, productivity and yield of the sinter. In particular, when a sintering machine provided with a magnetic brake on the chute is used, the charging speed of the sintering raw material changes depending on the FeO contained in the sintering raw material. Therefore, 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.

磁気ブレーキの磁束密度を調整する技術として、特許文献１には、磁気シュートの磁力を調整して焼結原料の装入速度を特定の範囲内とし、これにより、通気性を悪化させる着磁性微粉原料を装入層の上層側に偏析装入させて通気性の悪化を最小限とする焼結機の操業方法が開示されている。特許文献２には、スローピングシュート先端に配した磁力内臓ドラム表面の磁束密度を調整し、装入層の上層部に返鉱やミルスケールなどの強磁性物を多く偏在させる焼結原料の装入方法が開示されている。 As a technique for adjusting the magnetic flux density of the magnetic brake, Patent Document 1 states that the magnetic force of the magnetic chute is adjusted to keep the charging speed of the sintered raw material within a specific range, thereby deteriorating the air permeability. A method of operating a sintering machine that segregates and charges the raw material to the upper layer side of the charging layer to minimize the deterioration of air permeability is disclosed. In Patent Document 2, a sintered raw material is charged in which the magnetic flux density on the surface of a drum with a built-in magnetic force arranged at the tip of a sloping chute is adjusted, and a large amount of ferromagnetic materials such as return ore and mill scale are unevenly distributed in the upper layer of the charging layer. The method is disclosed.

特開２０１６−８９２６８号公報Japanese Unexamined Patent Publication No. 2016-89268 特開２００１−２３４２５７号公報Japanese Unexamined Patent Publication No. 2001-234257

近年、鉄鉱石の鉄分濃度が低下し、代わりにＳｉＯ２やＡｌ２Ｏ３といった脈石成分の濃度が増加しており、同じパイルから取り出された鉄鉱石であってもその成分濃度が異なる場合もあるほど鉄鉱石の成分濃度が不安定になってきている。また、製鉄所内で発生する各種ダストに関しても、発生量の変動やダスト自体の成分変動が大きく、焼結原料の成分濃度の管理が非常に難しくなっている。特許文献１および特許文献２には、磁気ブレーキの磁力を調整して装入層の装入状態を調整する技術が開示されているが、焼結鉱製造中において焼結原料の成分濃度が変動すると、磁気ブレーキの磁力を調整しても装入層の装入状態を調整できない、といった課題があった。 In recent years, the iron concentration of iron ore has decreased, and instead the concentration of gangue components such as SiO 2 and Al 2 O 3 has increased, and even iron ore extracted from the same pile has different component concentrations. The more iron ore, the more unstable the component concentration. Further, with respect to various dusts generated in the steelworks, the amount of dust generated and the components of the dust itself fluctuate greatly, which makes it very difficult to control the component concentration of the sintered raw material. Patent Document 1 and Patent Document 2 disclose a technique for adjusting the charging state of the charging layer by adjusting the magnetic force of the magnetic brake, but the component concentration of the sintered raw material fluctuates during the production of the sintered ore. Then, there is a problem that the charging state of the charging layer cannot be adjusted even if the magnetic force of the magnetic brake is adjusted.

本発明は、このような従来技術の問題点を鑑みてなされたものであり、その目的は、焼結鉱製造中に焼結原料の成分濃度が変動したとしても、装入層の装入密度の変動を小さくできる焼結鉱の製造方法を提供することにある。 The present invention has been made in view of such problems of the prior art, and an object of the present invention is the charging density of the charging layer even if the component concentration of the sinter raw material fluctuates during the production of the sinter. It is an object of the present invention to provide a method for producing a sinter that can reduce the fluctuation of the sinter.

このような課題を解決する本発明の特徴は、以下の通りである。
（１）少なくとも鉄含有原料、ＣａＯ含有原料および凝結材が配合された焼結原料を造粒し、造粒された前記焼結原料を焼結機の原料装入装置からパレット台車に装入して装入層を形成させ、前記装入層を焼結機で焼結して焼結鉱を製造する焼結鉱の製造方法であって、
前記原料装入装置は、装入ゲートと、シュートとを備え、前記鉄含有原料、前記焼結原料および前記造粒された焼結原料のうち少なくとも１つの成分濃度を測定する測定工程と、前記測定工程で測定された成分濃度を用いて、前記装入層の装入密度が予め定められた装入密度になるように前記装入ゲートの開度および前記シュートの水平面に対する傾斜角度のうち少なくとも１つを調整する調整工程と、を有する、焼結鉱の製造方法。
（２）前記測定工程では、少なくともＣａＯの成分濃度を測定する、（１）に記載の焼結鉱の製造方法。
（３）少なくとも鉄含有原料、ＣａＯ含有原料および凝結材が配合された焼結原料を造粒し、造粒された前記焼結原料を焼結機の原料装入装置からパレット台車に装入して装入層を形成させ、前記装入層を焼結機で焼結して焼結鉱を製造する焼結鉱の製造方法であって、前記鉄含有原料、前記焼結原料および前記造粒された焼結原料のうち少なくとも１つの成分濃度を測定する測定工程と、前記測定工程で測定された成分濃度を用いて、前記装入層の装入密度が予め定められた装入密度になるように前記装入ゲートの開度、前記シュートの水平面に対する傾斜角度および前記磁気ブレーキの磁力のうち少なくとも１つを調整する調整工程と、を有する、焼結鉱の製造方法。
（４）前記測定工程では、少なくともＦｅＯの成分濃度を測定する、（３）に記載の焼結鉱の製造方法。
（５）前記測定工程で測定されたＣａＯの成分濃度が高くなるほど、前記調整工程では前記装入ゲートの開度および前記シュートの水平面に対する傾斜角度のうち少なくとも１つを増加させる、（２）に記載の焼結鉱の製造方法。
（６）前記測定工程で測定されたＦｅＯの成分濃度が高くなるほど、前記調整工程では前記装入ゲートの開度を増加させる、前記シュートの水平面に対する傾斜角度を増加させる、および、前記磁気ブレーキの磁力を弱める、のうち少なくとも１つを実施する、（４）に記載の焼結鉱の製造方法。 The features of the present invention that solve such a problem are as follows.
(1) A sintered raw material containing at least an iron-containing raw material, a CaO-containing raw material, and a coagulant is granulated, and the granulated sintered raw material is charged into a pallet carriage from a raw material charging device of a sintering machine. It is a method for producing a sinter, which forms a charge layer and sinters the charge layer with a sinter to produce a sinter.
The raw material charging device includes a charging gate and a chute, and includes a measuring step of measuring the concentration of at least one component of the iron-containing raw material, the sintered raw material, and the granulated sintered raw material, and the above-mentioned. Using the component concentration measured in the measuring 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 a sinter, which comprises an adjustment step of adjusting one.
(2) The method for producing a sinter according to (1), wherein at least the component concentration of CaO is measured in the measurement step.
(3) A sintered raw material containing at least an iron-containing raw material, a CaO-containing raw material, and a coagulant is granulated, and the granulated sintered raw material is charged into a pallet carriage from a raw material charging device of a sintering machine. This is a method for producing a sintered ore, in which an charged layer is formed and the charged layer is sintered with a sinter to produce a sintered ore, wherein the iron-containing raw material, the sintered raw material, and the granulation are performed. Using the measuring step of measuring the concentration of at least one component of the sintered raw material and the component concentration measured in the measuring step, the charging density of the charging layer becomes a predetermined charging density. A method for producing a sinter, which comprises an adjustment step of adjusting at least one of the opening degree 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 sinter according to (3), wherein at least the component concentration of FeO is measured in the measurement step.
(5) As the concentration of CaO components measured in the measuring 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 adjusting step (2). The method for producing a sintered ore according to the description.
(6) As the concentration of the FeO component measured in the measuring step increases, the opening degree of the charging gate is increased, the inclination angle of the chute with respect to the horizontal plane is increased, and the magnetic brake is used in the adjusting step. The method for producing a sinter according to (4), wherein at least one of weakening the magnetic force is carried out.

本発明の焼結鉱の製造方法の実施することで、焼結鉱製造中に焼結原料の成分濃度が変動したとしても、装入層の装入密度の変動を小さくでき、焼結鉱の生産ベースの低下の抑制が実現できる。 By implementing the method for producing sinter of the present invention, even if the component concentration of the sinter raw material fluctuates during the production of sinter, the fluctuation of the charge density of the charge layer can be reduced, and the sinter can be produced. It is possible to suppress the decline in the production base.

第１の実施形態に係る焼結鉱の製造方法が実施できる焼結鉱製造装置１０の一例を示す模式図である。It is a schematic diagram which shows an example of the sinter production apparatus 10 which can carry out the sinter production method which concerns on 1st Embodiment. 焼結原料装入装置４２を示す側面断面模式図である。It is a side sectional schematic diagram which shows the sintered raw material charging apparatus 42. 第２の実施形態に係る焼結鉱の製造方法で使用される焼結原料装入装置４３の側面断面模式図である。FIG. 5 is a schematic side sectional view of a sinter raw material charging device 43 used in the method for producing a sinter according to a second embodiment. 発明例１におけるＣａＯ濃度と、擬似粒子径と、装入ゲートの開度と、装入厚と、生産ベースの変動を示すグラフである。It is a graph which shows the CaO concentration in Invention Example 1, the pseudo particle diameter, the opening degree of the charge gate, the charge thickness, and the fluctuation of a production base. 比較例１におけるＣａＯ濃度と、擬似粒子径と、装入ゲートの開度と、装入厚と、生産ベースの変動を示すグラフである。It is a graph which shows the CaO concentration in the comparative example 1, the pseudo particle diameter, the opening degree of the charge gate, the charge thickness, and the fluctuation of a production base. 発明例２におけるＦｅＯ濃度と、装入ゲートの開度と、装入層の装入厚と、生産ベースの変動を示すグラフである。It is a graph which shows the FeO concentration in Invention Example 2, the opening degree of the charging gate, the charging thickness of the charging layer, and the fluctuation of the production base. 比較例２におけるＦｅＯ濃度と、装入ゲートの開度と、装入層の装入厚と、生産ベースの変動を示すグラフである。3 is a graph showing the FeO concentration in Comparative Example 2, the opening degree of the charging gate, the charging thickness of the charging layer, and the fluctuation of the production base.

以下、発明の実施形態を通じて本発明を説明する。図１は、第１の実施形態に係る焼結鉱の製造方法が実施できる焼結鉱製造装置１０の一例を示す模式図である。ヤード１１に原料パイルで保管された鉄含有原料１２は、搬送コンベア１４によって配合槽２２に搬送される。鉄含有原料１２は、種々の銘柄の鉄鉱石および製鉄所内発生ダストを含む。製鉄所内発生ダストにはＣａＯが含まれ、その成分濃度は変動する。このため、製鉄所内発生ダストを含む鉄含有原料１２のＣａＯの成分濃度も変動する。 Hereinafter, the present invention will be described through embodiments of the invention. FIG. 1 is a schematic view showing an example of a sinter manufacturing apparatus 10 capable of carrying out the sinter manufacturing method according to the first embodiment. The iron-containing raw material 12 stored in the raw material pile in the yard 11 is conveyed to the compounding tank 22 by the transfer conveyor 14. The iron-containing raw material 12 contains various brands of iron ore and dust generated in the steelworks. CaO is contained in the dust generated in the steelworks, and the concentration of the component fluctuates. Therefore, the concentration of CaO components in the iron-containing raw material 12 containing dust generated in the steelworks also fluctuates.

原料供給部２０は、複数の配合槽２２、２４、２５、２６、２８を備える。配合槽２２には、鉄含有原料１２が貯留される。配合槽２４には、石灰石や生石灰等を含むＣａＯ含有原料１６、配合槽２５にはドロマイトや精錬ニッケルスラグ等を含むＭｇＯ含有原料１７がそれぞれ貯留される。配合槽２６には、ロッドミルを用いて粒径１ｍｍ以下に破砕された粉コークスや無煙炭を含む凝結材１８が貯留される。また、配合槽２８には、焼結鉱の篩下となった粒径５ｍｍ以下の返鉱（焼結鉱篩下粉）が貯留される。原料供給部２０の配合槽２２〜２８から、各原料が所定量切り出され、これらが配合されて焼結原料となる。焼結原料は、搬送コンベア３０によってドラムミキサー３６に搬送される。なお、ＭｇＯ含有原料１７は、任意配合原料であって、焼結原料に配合されてもよく、配合されなくてもよい。 The raw material supply unit 20 includes a plurality of compounding tanks 22, 24, 25, 26, and 28. The iron-containing raw material 12 is stored in the compounding tank 22. The compounding tank 24 stores the CaO-containing raw material 16 containing limestone, quicklime, and the like, and the compounding tank 25 stores the MgO-containing raw material 17 containing dolomite, refined nickel slag, and the like. The compounding tank 26 stores a coagulant 18 containing coke breeze and anthracite crushed to a particle size of 1 mm or less using a rod mill. Further, in the compounding tank 28, the return ore (sintered ore sieving powder) having a particle size of 5 mm or less, which is under the sieve of the sinter, is stored. 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 form a sintered raw material. The sintered raw material is conveyed to the drum mixer 36 by the conveyor 30. The MgO-containing raw material 17 is an optional blended raw material and may or may not be blended with the sintered raw material.

配合槽２８とドラムミキサー３６の間の搬送コンベア３０には、赤外線分析計３２が設けられている。赤外線分析計３２を用いて測定工程が実施される。測定工程では、搬送コンベア３０上を搬送される焼結原料に含まれる水分およびＣａＯの成分濃度を連続測定する。但し、焼結原料の水分濃度は、ほとんど変動しないので、焼結原料の水分濃度を測定せずに過去の実績値を用いてもよい。 An infrared analyzer 32 is provided on the conveyor 30 between the compounding tank 28 and the drum mixer 36. The measurement step is carried out using the infrared analyzer 32. In the measurement step, the water content and the CaO component concentration contained in the sintered raw material conveyed on the transfer conveyor 30 are continuously measured. However, since the water concentration of the sintered raw material hardly fluctuates, the past actual value may be used without measuring the water concentration of the sintered raw material.

赤外線分析計３２は、０．５〜５０．０μｍの範囲内の波長の赤外線を焼結原料に照射して、焼結原料からの反射光を受光する。焼結原料に含まれるＣａＯの分子振動は、照射された赤外線の固有の波長成分を吸収するので、これらの成分は反射赤外線に固有の波長成分を付与する。このため、照射赤外線と反射赤外線とを分析することで焼結原料におけるＣａＯの成分濃度を測定できる。 The infrared analyzer 32 irradiates the sintered raw material with infrared rays having a wavelength in the range of 0.5 to 50.0 μm, and receives the reflected light from the sintered raw material. Since the molecular vibration of CaO contained in the sintering raw material absorbs the unique wavelength component of the irradiated infrared rays, these components impart the unique wavelength component to the reflected infrared rays. Therefore, the concentration of CaO components in the sintered raw material can be measured by analyzing the irradiated infrared rays and the reflected infrared rays.

赤外線分析計３２は、例えば、１分間に１２８回の頻度で２０以上の波長の赤外線を照射でき、焼結原料に反射された反射光を受光できる。このように短時間に赤外線を照射できるので、赤外線分析計３２は、搬送コンベア３０上を搬送される焼結原料の成分濃度をオンラインで連続測定できる。なお、赤外線分析計３２は、焼結原料の成分濃度を測定する分析装置の一例であり、反射光を分光する方式の装置に限らず、透過光を分光する方式の装置を用いてもよい。さらに、赤外線分析計３２に代えて、レーザーを測定対象に照射するレーザー分析計、中性子を測定対象に照射する中性子分析計、または、マイクロ波を測定対象に照射するマイクロ波分析計を用いてもよい。本実施形態において、測定工程の測定頻度は、例えば１分間に１２８回であり、当該１２８回の成分濃度の平均値を１分間に１回算出した。 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 the reflected light reflected by the sintered raw material. Since infrared rays can be irradiated in such a short time, the infrared analyzer 32 can continuously measure the component concentration of the sintered raw material transported on the transport conveyor 30 online. The infrared analyzer 32 is an example of an analyzer that measures the component concentration of the sintered raw material, and is not limited to an apparatus that disperses reflected light, and an apparatus that disperses transmitted light may be used. 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 step is, for example, 128 times per minute, and the average value of the component concentrations of the 128 times is calculated once per minute.

ドラムミキサー３６に搬送された焼結原料は、ドラムミキサー３６に投入され、適量の水３４が添加されて、例えば、平均粒径３．０〜６．０ｍｍの擬似粒子に造粒される。造粒された焼結原料は、搬送コンベア３８によって焼結機４０の焼結原料装入装置４２に搬送される。なお、ドラムミキサー３６は、焼結原料を造粒する造粒装置の一例であり、ドラムミキサー３６は複数あってもよく、ドラムミキサー３６に代えて、ペレタイザー造粒機を用いてもよい。また、ドラムミキサー３６とペレタイザー造粒機の両方を用いてもよく、ドラムミキサー３６の上流に高速撹拌機を設置して、造粒前に焼結原料を撹拌してもよい。なお、本実施形態において、平均粒径は算術平均粒径であって、Σ（Ｖｉ×ｄｉ）（但し、Ｖｉはｉ番目の粒度範囲の中にある粒子の存在比率であり、ｄｉはｉ番目の粒度範囲の代表粒径である。）で定義される粒径である。以後の説明において、擬似粒子の平均粒径を擬似粒子径と記載する場合がある。 The sintered raw material conveyed to the drum mixer 36 is charged into the drum mixer 36, and an appropriate amount of water 34 is added to granulate the pseudo particles having an average particle size of, for example, 3.0 to 6.0 mm. The granulated sintering raw material is conveyed to the sintering raw material charging device 42 of the sintering machine 40 by the conveying conveyor 38. The drum mixer 36 is an example of a granulator that granulates a sintered raw material. 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, or a high-speed stirrer may be installed upstream of the drum mixer 36 to stir the sintered raw material before granulation. In the present embodiment, the average particle size is the arithmetic mean particle size, 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 size range. It is a particle size defined by). In the following description, the average particle size of the pseudo-particles may be referred to as the pseudo-particle diameter.

焼結機４０は、例えば、下方吸引式のドワイトロイド焼結機である。焼結機４０は、焼結原料装入装置４２と、無端移動式のパレット台車４４と、点火炉４６と、気体燃料供給装置４７と、ウインドボックス４８とを有する。 The sintering machine 40 is, for example, a downward suction type dwightroid sintering machine. The sintering machine 40 includes a sintering raw material charging device 42, an endlessly movable pallet carriage 44, an ignition furnace 46, a gas fuel supply device 47, and a windbox 48.

図２は、焼結原料装入装置４２を示す側面断面模式図である。焼結原料装入装置４２は、給鉱ホッパー８２と、ドラムフィーダー８４と、装入ゲート８６と、シュート８８とを有する。焼結原料装入装置４２に搬送された造粒された焼結原料は、給鉱ホッパー８２に投入される。給鉱ホッパー８２内の焼結原料は、ドラムフィーダー８４によって切り出され、装入ゲート８６を通り、シュート８８上を矢印９０方向に滑り落ちてパレット台車４４に装入される。パレット台車４４に装入された焼結原料によって焼結原料の装入層が形成される。なお、矢印９２は、パレット台車４４の進行方向を示す。 FIG. 2 is a schematic side sectional view showing the sintered raw material charging device 42. The sintering raw material charging device 42 includes a mining 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 mining hopper 82. The sintered raw material in the mining 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 the arrow 90, and is charged into the pallet carriage 44. The sintered raw material charged into the pallet carriage 44 forms a charged layer of the sintered raw material. The arrow 92 indicates the traveling direction of the pallet carriage 44.

装入ゲート８６は、焼結機４０の幅方向に沿って複数設けられた板状の部材である。装入ゲート８６のそれぞれには、その開度を調整する不図示の開度調整装置が設けられている。装入ゲート８６は、当該開度調整装置により装入ゲート８６の開度が調整され、これにより、パレット台車４４に装入される焼結原料の装入速度および装入状態が調整される。 The charging gate 86 is a plurality of plate-shaped members provided along the width direction of the sintering machine 40. Each of the charging gates 86 is provided with an opening degree adjusting device (not shown) for adjusting the opening degree thereof. The opening degree of the charging gate 86 is adjusted by the opening degree adjusting device, whereby the charging speed and the charging state of the sintered raw material charged into the pallet carriage 44 are adjusted.

シュート８８は、焼結機４０の幅方向に延在し、水平面に対して所定の傾斜角度αで傾斜した板状の部材である。シュート８８には、その傾斜角度αを調整する不図示の角度調整装置が設けられている。シュート８８は、当該角度調整装置によりシュート８８の傾斜角度αが調整され、これにより、パレット台車４４に装入される焼結原料の装入速度および装入状態が調整される。 The chute 88 is a plate-shaped 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) for adjusting the tilt 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 the charging state of the sintered raw material charged into the pallet carriage 44 are adjusted.

再び、図１を参照し、装入層は点火炉４６で点火される。ウインドボックス４８を通じて空気を吸引することで、装入層は、上方に設けられた気体燃料供給装置４７から供給される気体燃料および酸素を装入層に取り込み、装入層内で気体燃料と凝結材１８とを燃焼させつつ装入層内の燃焼・溶融帯を装入層の下方へ移動させる。これにより、装入層は焼結されて焼結ケーキが形成される。本実施形態において気体燃料は、高炉ガス、コークス炉ガス、高炉・コークス炉混合ガス、転炉ガス、都市ガス、天然ガス、メタンガス、エタンガス、プロパンガス、シェールガスおよびそれらの混合ガスのうちから選ばれるいずれかの可燃性ガスである。なお、図１に示した例では、気体燃料供給装置４７を有する焼結機４０の例を示したが、焼結機４０は気体燃料供給装置４７を有していなくてもよい。 Again, referring to FIG. 1, the charge layer is ignited in the ignition furnace 46. By sucking air through the window box 48, the charging layer takes in the gas fuel and oxygen supplied from the gas fuel supply device 47 provided above into the charging layer and condenses with the gas fuel in the charging layer. While burning the material 18, the combustion / melting zone in the charging layer is moved below the charging layer. As a result, the charging layer is 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, linz-Donaw gas, city gas, natural gas, methane gas, ethane gas, propane gas, shale gas and their mixed gas. Is one of the flammable gases. In the example shown in FIG. 1, an example of the sintering machine 40 having the gas fuel supply device 47 is shown, but the sintering machine 40 does not have to have the gas fuel supply device 47.

焼結ケーキは、破砕機５０によって破砕され焼結鉱にされる。破砕機５０で破砕された焼結鉱は、冷却機６０によって冷却される。冷却機６０によって冷却された焼結鉱は、複数の篩を有する篩分け装置７０によって篩分けされ、粒径５ｍｍ超の成品焼結鉱７２と、粒径５ｍｍ以下の返鉱７４とに篩分けされる。 The sintered cake is crushed by a crusher 50 into a sintered ore. The sinter crushed by the crusher 50 is cooled by the cooler 60. The sinter cooled by the cooler 60 is sieved by a sieving device 70 having a plurality of sieves, and is sieved into a product sinter 72 having a particle size of more than 5 mm and a return ore 74 having a particle size of 5 mm or less. Will be done.

成品焼結鉱７２は、搬送コンベア７６によって高炉８０に搬送され、高炉原料として高炉８０に装入される。一方、返鉱７４は、搬送コンベア７８によって原料供給部２０の配合槽２８に搬送される。なお、成品焼結鉱７２は、破砕機５０によって破砕された焼結鉱が冷却され、篩分けされたものであるので、成品焼結鉱７２と破砕機５０によって破砕された焼結鉱とは同じ成分濃度の焼結鉱である。また、本実施形態において、成品焼結鉱７２の粒径および返鉱７４の粒径は、篩によって篩分けられる粒径を意味し、例えば、粒径５ｍｍ超とは、目開き５ｍｍの篩を用いて篩上に篩分けされる粒径であり、粒径５ｍｍ以下とは、目開き５ｍｍの篩を用いて篩下に篩分けされる粒径である。さらに、成品焼結鉱７２および返鉱７４の粒径の各値は、あくまで一例であり、この値に限定するものではない。 The product sintered ore 72 is conveyed to the blast furnace 80 by the transfer conveyor 76, and is charged into the blast furnace 80 as a raw material for the blast furnace. On the other hand, the return ore 74 is conveyed to the compounding tank 28 of the raw material supply unit 20 by the conveyor 78. Since the sinter 72 is obtained by cooling the sinter crushed by the crusher 50 and sieving it, the sinter 72 and the sinter crushed by the crusher 50 are different from each other. It is a sinter with the same component concentration. Further, in the present embodiment, the particle size of the product sintered ore 72 and the particle size of the returned ore 74 mean the particle size that can be sieved by a sieve. For example, if the particle size exceeds 5 mm, a sieve having a mesh size of 5 mm is used. The particle size that is sieved on the sieve using the sieve, and the particle size of 5 mm or less is the particle size that is sieved under the sieve using a sieve having a mesh size of 5 mm. Further, the respective values of the particle sizes of the product sintered ore 72 and the returned ore 74 are merely examples, and are not limited to these values.

発明者らは、焼結鉱製造装置１０を用いた焼結鉱の製造において、焼結原料のＣａＯの成分濃度が高くなると焼結鉱の生産ベースが低下する傾向があることを発見した。ここで、焼結鉱の生産ベースとは、焼結鉱の１時間あたりの生産量（ｔ／ｈ）であり、この生産ベースが多いほど焼結鉱製造の操業状態が良好であることを示す。焼結原料のＣａＯの成分濃度が高くなると焼結鉱の生産ベースが低下する機構を究明するため、焼結工程の前工程である造粒工程を含めて焼結原料の挙動を観察したところ、焼結原料のＣａＯの成分濃度が高いほど造粒工程で造粒される疑似粒子の径が大きくなって装入層の装入密度が低下し、焼結鉱の生産ベースが低下することをつきとめた。このことから、ＣａＯの成分濃度が高くなった場合には焼結機への焼結原料の１時間あたりの切り出し体積（ｍ３／ｈ）を増加させて装入層の装入密度の変動を抑制し、これにより、焼結鉱の生産ベースの低下を抑制することに着想した。 The inventors have discovered that in the production of sinter using the sinter production apparatus 10, the production base of the sinter tends to decrease as the concentration of the CaO component of the sinter raw material increases. Here, the production base of sinter is the production amount (t / h) of sinter per hour, and the larger the production base, the better the operating state of sinter production. .. In order to investigate the mechanism by which the production base of sinter decreases as the CaO component concentration of the sinter raw material increases, the behavior of the sinter raw material was observed including the granulation process, which is the pre-process of the sinter process. It was found that the higher the concentration of the CaO component of the sinter 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 the sinter. It was. From this, when the component concentration of CaO becomes high, the volume (m 3 / h) of the sintering raw material cut out into the sintering machine per hour is increased to change the charging density of the charging layer. The idea was to curb and thereby curb the decline in the production base of sinter.

このため、第１の実施形態に係る焼結鉱の製造方法では、さらに、測定工程で連続測定されたＣａＯの成分濃度を用いて、装入層の装入状態が予め定められた状態になるように装入ゲート８６の開度およびシュート８８の水平面に対する傾斜角度のうち少なくとも１つを調整する調整工程が実施される。本実施形態において、測定工程で連続測定されたＣａＯの成分濃度と、予め設定されているドラムミキサー３６の造粒条件とから擬似粒子の平均粒径と装入層の装入密度とを推測し、装入層の装入密度が予め定められた装入密度になるように調整工程が実施される。このように、装入層の装入密度が予め定められた装入密度になるように調整することで装入層の装入密度の変動は小さくなる。 Therefore, in the method for producing sinter according to the first embodiment, the charging state of the charging layer becomes a predetermined state by using the component concentration of CaO continuously measured in the measuring step. As described above, the adjustment step of adjusting 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 is carried out. In the present embodiment, the average particle size of the pseudo particles and the charging density of the charging layer are estimated from the CaO component concentration continuously measured in the measuring step and the granulation conditions of the drum mixer 36 set in advance. , The adjustment step is carried out so that the charging density of the charging layer becomes a predetermined charging density. In this way, by adjusting the charging density of the charging layer to be a predetermined charging density, the fluctuation of the charging density of the charging layer becomes small.

例えば、焼結原料のＣａＯ濃度が基準となるＣａＯ濃度より高い場合には焼結原料の造粒性が向上するので平均粒径の大きな擬似粒子が造粒される。平均粒径の大きな擬似粒子によって形成される装入層は、平均粒径の小さな擬似粒子によって形成される装入層よりも粒子間の空隙が大きくなるので装入層の通気性は向上するものの装入密度は低下する。 For example, when the CaO concentration of the sintered raw material is higher than the standard CaO concentration, the granulation property of the sintered raw material is improved, so that pseudo-particles having a large average particle size are granulated. Although the charge layer formed by the pseudo particles having a large average particle size has larger voids between the particles than the charge layer formed by the pseudo particles having a small average particle size, the air permeability of the charge layer is improved. The charge density decreases.

このように、焼結原料のＣａＯ濃度が高くなると装入層の装入密度が低下して焼結鉱の生産ベースが低下する。このため、焼結原料のＣａＯ濃度が基準となるＣａＯ濃度より高くなった場合には、装入ゲート８６の開度およびシュート８８の傾斜角度のうち少なくとも１つを増加させ、焼結原料の装入速度を速めて装入層の装入密度を高める。これにより、装入層の装入密度の低下が抑制され、焼結鉱の生産ベースの低下が抑制される。 As described above, when the CaO concentration of the sinter raw material is high, the charge density of the charge layer is lowered and the production base of the sinter is lowered. Therefore, when the CaO concentration of the sintered 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 to charge the sintered raw material. Increase the charging speed and increase the charging density of the charging layer. As a result, the decrease in the charge density of the charge layer is suppressed, and the decrease in the production base of the sinter is suppressed.

装入ゲート８６の開度およびシュート８８の傾斜角度の調整は、基準となる焼結原料のＣａＯ濃度と、測定工程で測定された焼結原料のＣａＯ濃度に基づいて実施される。基準となるＣａＯ濃度は、基準となる装入ゲート８６の開度およびシュート８８の傾斜角度で目標とする装入密度の装入層が形成される擬似粒子の平均粒径を求め、当該平均粒径の擬似粒子が造粒される焼結原料のＣａＯ濃度から定めてよい。 The opening degree of the charging gate 86 and the inclination angle of the chute 88 are adjusted based on the reference CaO concentration of the sintered raw material and the CaO concentration of the sintered raw material measured in the measuring step. For the reference CaO concentration, the average particle size of the pseudo-particles in which the charge layer of the target charge density is formed is determined by the opening degree of the reference charge gate 86 and the inclination angle of the chute 88, and the average grain size is obtained. It may be determined from the CaO concentration of the sintering raw material in which the pseudo-particles having a diameter are granulated.

一方、測定工程で測定された焼結原料のＣａＯ濃度が基準となる焼結原料のＣａＯ濃度よりも低い場合には焼結原料の造粒性が低下するので平均粒径の小さな擬似粒子が造粒される。平均粒径の小さな擬似粒子によって形成される装入層は、平均粒径の大きな擬似粒子によって形成される装入層よりも粒子間の空隙が小さくなるので装入層の通気性は低下し、装入密度は向上する。 On the other hand, when the CaO concentration of the sintering raw material measured in the measuring step is lower than the CaO concentration of the sintering raw material as a reference, the granulation property of the sintering raw material deteriorates, so that pseudo-particles having a small average particle size are produced. It is grained. Since the charge layer formed by the pseudo particles having a small average particle size has smaller voids between the particles than the charge layer formed by the pseudo particles having a large average particle size, the air permeability of the charge layer is lowered. The charge density is improved.

このように、焼結原料のＣａＯ濃度が低くなると装入層の装入密度が向上して装入層の通気性が低下する。このため、焼結原料のＣａＯ濃度が基準となるＣａＯ濃度より低くなった場合には、装入ゲート８６の開度およびシュート８８の傾斜角度のうち少なくとも１つを小さくし、焼結原料の装入速度を遅くして装入層の装入密度を低くする。これにより、装入層の通気性の悪化が抑制され、焼結鉱の生産ベースの低下を抑制できる。 As described above, when the CaO concentration of the sintered raw material is lowered, the charging density of the charging layer is increased and the air permeability of the charging layer is lowered. Therefore, when the CaO concentration of the sintered raw material becomes 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 to charge the sintered raw material. The charging speed is slowed down to reduce the charging density of the charging layer. As a result, deterioration of the air permeability of the charging layer can be suppressed, and deterioration of the production base of the sinter can be suppressed.

以上、説明したように第１の実施形態に係る焼結鉱の製造方法では、焼結原料の造粒性に影響を及ぼすＣａＯの成分濃度を連続測定し、当該成分濃度から擬似粒子の平均粒径と装入層の装入密度とを推測し、装入層の装入密度が予め定められた装入密度になるように調整工程が実施される。これにより、装入層の装入密度の変動は小さくなり、焼結鉱の生産ベースの低下が抑制される。 As described above, in the method for producing sinter according to the first embodiment, the concentration of CaO components that affect the granulation property of the sinter raw material is continuously measured, and the average grain size of the pseudo particles is measured from the component concentration. The diameter and the charging density of the charging layer are estimated, and the adjustment step is carried out so that the charging density of the charging layer becomes a predetermined charging density. As a result, the fluctuation of the charging density of the charging layer is reduced, and the decrease in the production base of the sinter is suppressed.

装入層の装入密度の変動が大きくなると、焼結機の機長方向の通気性の偏差が生じ、焼結原料の焼結完了位置が変動する。この焼結完了位置の変動により焼結鉱の歩留が低下する。また、パレット台車４４の進行速度を変更して、焼結完了位置を調整する場合には生産ベースが低下する。このように、装入層の装入密度の変動が大きくなることは、焼結鉱の生産ベースの低下につながる。 When the fluctuation of the charging density of the charging layer becomes large, the deviation of the air permeability in the machine length direction of the sintering machine occurs, and the sintering completion position of the sintering raw material fluctuates. The yield of the sinter decreases due to the change in the sinter 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. As described above, a large fluctuation in the charging density of the charging layer leads to a decrease in the production base of the sinter.

なお、図１に示した例において、赤外線分析計３２を搬送コンベア３０に設けて、連続測定工程を実施する例を示したがこれに限られない。例えば、赤外線分析計３２を搬送コンベア１４に設けて測定工程を実施してもよく、赤外線分析計３２を配合槽２２と配合槽２４との間の搬送コンベア３０に設けて測定工程を実施してもよい。この場合に、測定工程では、配合槽２２に搬送される鉄含有原料１２のＣａＯの成分濃度を連続測定する。 In the example shown in FIG. 1, an example in which the infrared analyzer 32 is provided on the conveyor 30 to carry out the continuous measurement step is shown, but the present invention is not limited to this. For example, the infrared analyzer 32 may be provided on the conveyor 14 to carry out the measurement step, or the infrared analyzer 32 may be provided on the conveyor 30 between the compounding tank 22 and the compounding tank 24 to carry out the measurement step. May be good. In this case, in the measuring step, the component concentration of CaO of the iron-containing raw material 12 conveyed to the compounding tank 22 is continuously measured.

焼結原料におけるＣａＯの成分濃度が変動する要因は、製鉄所内発生ダストに含まれるＣａＯの成分濃度の変動による影響が大きい。予め、原料供給部２０から配合される各原料のＣａＯの成分濃度を測定し、原料供給部２０から配合される各原料の質量と各原料に含まれるＣａＯの質量を把握しておけば、鉄含有原料１２のＣａＯの成分濃度と、原料供給部２０から配合される各原料の質量と、配合される各原料に含まれるＣａＯの質量とから焼結原料のＣａＯの成分濃度を算出できる。 The factor that causes the concentration of CaO components in the sintered raw material to fluctuate is largely due to the fluctuation in the concentration of CaO components contained in the dust generated in the steelworks. If the CaO component concentration 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 sintered raw material can be calculated from the CaO component concentration of the contained 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.

また、図１に示した例において、赤外線分析計３２を搬送コンベア３０に設けて、測定工程を実施する例を示したがこれに限られない。例えば、赤外線分析計３２を搬送コンベア３８に設け、造粒された焼結原料のＣａＯの成分濃度を連続測定してもよい。 Further, in the example shown in FIG. 1, an example in which the infrared analyzer 32 is provided on the conveyor 30 to carry out the measurement step is shown, but the present invention is not limited to this. For example, the infrared analyzer 32 may be provided on the conveyor 38 to continuously measure the component concentration of CaO of the granulated sintering raw material.

次に、第２の実施形態に係る焼結鉱の製造方法について説明する。第２の実施形態に係る焼結鉱の製造方法は、測定工程でＦｅＯの成分濃度を連続測定する点と、調整工程で装入ゲートの開度、シュートの傾斜角度および磁気ブレーキの磁力のうち少なくとも１つを調整する点において第１の実施形態に係る焼結鉱の製造方法と異なる。 Next, the method for producing the sinter according to the second embodiment will be described. The method for producing sinter according to the second embodiment includes the point that the FeO component concentration is continuously measured in the measuring step, the opening of the charging gate, the tilt angle of the chute, and the magnetic force of the magnetic brake in the adjusting step. It differs from the method for producing sinter according to the first embodiment in that at least one is adjusted.

図３は、第２の実施形態に係る焼結鉱の製造方法で使用される焼結原料装入装置４３の側面断面模式図である。図３に示した焼結原料装入装置４３において、図２に示した焼結原料装入装置４２と同じ構成には同じ参照番号を付して重複する説明を省略する。 FIG. 3 is a schematic side sectional view of the sinter raw material charging device 43 used in the method for producing sinter according to the second embodiment. In the sintered raw material charging device 43 shown in FIG. 3, the same reference number is given to the same configuration as the sintered raw material charging device 42 shown in FIG. 2, and duplicate description will be omitted.

第２の実施形態に係る焼結鉱の製造方法では、図２に示した焼結原料装入装置４２に代えて、図３に示す焼結原料装入装置４３を用いる。焼結原料装入装置４３は、給鉱ホッパー８２と、ドラムフィーダー８４と、装入ゲート８６と、シュート８８と、磁気ブレーキ９４とを有する。磁気ブレーキ９４は、位置調整装置９６と、磁石９８とを有する。磁石９８の磁力は、シュート８８の表面を滑り落ちる焼結原料の着磁性原料（ＦｅＯ）に作用して、シュート８８上を滑り落ちる焼結原料の装入速度を低下させる。 In the method for producing sinter according to the second embodiment, the sinter raw material charging device 43 shown in FIG. 3 is used instead of the sinter raw material charging device 42 shown in FIG. The sintered raw material charging device 43 includes a mining hopper 82, a drum feeder 84, a charging gate 86, a chute 88, and a magnetic brake 94. The magnetic brake 94 has a position adjusting device 96 and a magnet 98. The magnetic force of the magnet 98 acts on the magnetically charged 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.

位置調整装置９６は、磁石９８のシュート８８からの位置を調整する。位置調整装置９６により磁石９８とシュート８８との距離が離れると、シュート８８上を滑り落ちる焼結原料に作用する磁力は小さくなるので焼結原料の装入速度は速くなる。一方、位置調整装置９６により磁石９８とシュート８８との距離が近くなると、シュート８８上を滑り落ちる焼結原料に作用する磁力は大きくなるので焼結原料の装入速度は遅くなる。このように、磁気ブレーキ９４の磁力は、位置調整装置９６の位置よって調整でき、これにより、焼結原料の装入速度が調整される。 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 becomes smaller, so that the charging speed of the sintered raw material becomes faster. On the other hand, when the distance between the magnet 98 and the chute 88 is shortened by the position adjusting device 96, the magnetic force acting on the sintered raw material sliding down on the chute 88 becomes large, so that the charging speed of the sintered raw material becomes slow. In this way, the magnetic force of the magnetic brake 94 can be adjusted by the position of the position adjusting device 96, whereby the charging speed of the sintered raw material is adjusted.

第２の実施形態に係る焼結鉱の製造方法においても、赤外線分析計３２を用いた測定工程が実施される。測定工程では、搬送コンベア３０上を搬送される焼結原料に含まれるＦｅＯの成分濃度を連続測定する。そして、測定工程で連続測定されたＦｅＯの成分濃度を用いて、磁気ブレーキ９４の磁力を調整する調整工程が実施される。本実施形態において、調整工程は、測定工程で連続測定されたＦｅＯの成分濃度と、現在の磁気ブレーキ９４の位置とから装入層の装入密度を推測し、装入層の装入密度が予め定められた密度になるように調整工程が実施される。このように、装入層の装入密度が予め定められた密度になるように調整することで装入層の装入密度の変動は小さくなる。 Also in the method for producing sinter according to the second embodiment, the measurement step using the infrared analyzer 32 is carried out. In the measurement step, the component concentration of FeO contained in the sintered raw material conveyed on the transfer conveyor 30 is continuously measured. Then, an adjustment step of adjusting the magnetic force of the magnetic brake 94 is carried out using the component concentration of FeO continuously measured in the measurement step. In the present embodiment, in the adjusting step, the charging density of the charging layer is estimated from the component concentration of FeO continuously measured in the measuring step and the current position of the magnetic brake 94, and the charging density of the charging layer is determined. The adjustment step is carried out so as to have a predetermined density. In this way, by adjusting the charging density of the charging layer to a predetermined density, the fluctuation of the charging density of the charging layer becomes small.

例えば、焼結原料のＦｅＯ濃度が基準となるＦｅＯ濃度より高い場合には焼結原料に作用する磁気ブレーキ９４の磁力が大きくなるので、焼結原料の装入速度が遅くなって装入密度が低下する。このように、焼結原料のＦｅＯ濃度が高くなると装入層の装入密度が低下して焼結鉱の生産ベースが低下する。 For example, when the FeO concentration of the sintered raw material is higher than the reference FeO concentration, the magnetic force of the magnetic brake 94 acting on the sintered raw material becomes large, so that the charging speed of the sintered raw material becomes slow and the charging density becomes high. descend. As described above, when the FeO concentration of the sinter raw material is high, the charge density of the charge layer is lowered and the production base of the sinter is lowered.

このため、焼結原料のＦｅＯ濃度が基準となるＦｅＯ濃度より高い場合には、磁気ブレーキ９４の磁力を弱めて、装入速度を速めて装入密度を高める。これにより、装入層の装入密度低下が抑制され、焼結鉱の生産ベースの低下が抑制される。 Therefore, when the FeO concentration of the sintered 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. As a result, the decrease in the charge density of the charge layer is suppressed, and the decrease in the production base of the sinter is suppressed.

磁気ブレーキ９４の磁力の調整は、基準となる焼結原料のＦｅＯ濃度と、測定工程で測定された焼結原料のＦｅＯ濃度とに基づいて実施される。基準となるＦｅＯ濃度は、基準となる磁気ブレーキ９４の磁力で目標とする装入密度の装入層が形成される装入速度を求め、当該装入速度で装入される焼結原料のＦｅＯ濃度から定めてよい。 The magnetic force of the magnetic brake 94 is adjusted based on the reference FeO concentration of the sintered raw material and the FeO concentration of the sintered raw material measured in the measuring step. For the reference FeO concentration, the charging speed at which the charging layer of the target charging density is formed by the magnetic force of the reference magnetic brake 94 is obtained, and the FeO of the sintered raw material charged at the charging speed is obtained. It may be determined from the concentration.

一方、測定工程で測定された焼結原料のＦｅＯ濃度が基準となる焼結原料のＦｅＯ濃度よりも低い場合には焼結原料に作用する磁気ブレーキ９４の磁力が小さくなる。磁気ブレーキ９４の磁力が小さくなると焼結原料の装入速度が速くなって装入層の装入密度が高くなり、装入層の通気性が低下する。 On the other hand, when the FeO concentration of the sintered raw material measured in the measuring step is lower than the FeO concentration of the sintered raw material as a reference, the magnetic force of the magnetic brake 94 acting on the sintered raw material becomes small. When the magnetic force of the magnetic brake 94 becomes small, the charging speed of the sintered raw material becomes high, the charging density of the charging layer becomes high, and the air permeability of the charging layer decreases.

このように、焼結原料のＦｅＯ濃度が低くなると装入層の装入密度が向上して装入層の通気性が低下する。このため、焼結原料のＦｅＯ濃度が基準となるＦｅＯ濃度より低くなった場合には、磁気ブレーキ９４の磁力を増加させ、装入速度を遅くして装入層の装入密度を低くする。これにより、装入層の通気性の悪化が抑制され、焼結鉱の生産ベースの低下を抑制できる。 As described above, when the FeO concentration of the sintered raw material is lowered, the charging density of the charging layer is increased and the air permeability of the charging layer is lowered. Therefore, when the FeO concentration of the sintered raw material becomes lower than the reference FeO concentration, the magnetic force of the magnetic brake 94 is increased, the charging speed is slowed down, and the charging density of the charging layer is lowered. As a result, deterioration of the air permeability of the charging layer can be suppressed, and deterioration of the production base of the sinter can be suppressed.

以上、説明したように第２の実施形態に係る焼結鉱の製造方法では、焼結原料のＦｅＯの成分濃度を連続測定し、当該成分濃度から装入層の装入密度を推測し、装入層の装入密度が予め定められた装入密度になるように調整工程が実施される。これにより、装入層の装入密度の変動は小さくなり、焼結鉱の生産ベースの低下が抑制される。 As described above, in the method for producing a sintered ore according to the second embodiment, the component concentration of FeO of the sintered raw material is continuously measured, the charging density of the charging layer is estimated from the component concentration, and the charging is loaded. The adjustment step is carried out so that the charging density of the layer is a predetermined charging density. As a result, the fluctuation of the charging density of the charging layer is reduced, and the decrease in the production base of the sinter is suppressed.

なお、第２の実施形態では、焼結原料の装入密度が予め定められた装入密度になるように、磁気ブレーキ９４の磁力を調整する例を示したがこれに限られない。第１の実施形態で説明したように、装入ゲート８６の開度を増加させたりシュート８８の傾斜角度を増加させたりすることで装入層の装入密度を高めることができ、装入ゲート８６の開度を小さくしたりシュート８８の水平面に対する傾斜角度を小さくすることで装入層の装入密度を下げることができる。このため、磁気ブレーキ９４の磁力の調整に代えて、また、磁気ブレーキ９４の磁力の調整とともに、装入ゲート８６の開度およびシュート８８の水平面に対する傾斜角度のうち少なくとも１つを調整してもよい。例えば、ＦｅＯ濃度が基準となるＦｅＯ濃度より高い場合に、磁気ブレーキ９４の磁力を弱めることに代えて、または、磁気ブレーキ９４の磁力を弱めるとともに、装入ゲート８６の開度を増加させたり、シュート８８の傾斜角度を増加させてもよい。これにより、焼結原料の装入速度が調整され、装入層の装入密度の変動を小さくできる。また、第２の実施形態における測定工程で焼結原料のＣａＯ濃度をさらに測定し、調整工程でＦｅＯ濃度およびＣａＯ濃度に基づいて装入層の装入密度が予め定められた装入密度になるように、磁気ブレーキ９４の磁力、装入ゲート８６の開度およびシュート８８の水平面に対する傾斜角度のうち少なくとも１つを調整してもよい。 In the second embodiment, an example is shown 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, 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 degree of the charging gate 86 and the inclination angle of the chute 88, and the charging gate can be increased. By reducing the opening degree of 86 and the inclination angle of the chute 88 with respect to the horizontal plane, the charging density of the charging layer can be reduced. Therefore, instead of adjusting the magnetic force of the magnetic brake 94, and 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 weakening the magnetic force of the magnetic brake 94, or weakening the magnetic force of the magnetic brake 94 and increasing the opening degree of the charging gate 86, The tilt angle of the chute 88 may be increased. As a result, the charging speed of the sintered raw material can be adjusted, and the fluctuation of the charging density of the charging layer can be reduced. Further, in the measuring step of the second embodiment, the CaO concentration of the sintered raw material is further measured, and in the adjusting step, the charging density of the charging layer becomes a predetermined charging density based on the FeO concentration and the CaO concentration. 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.

（実施例１）
図２に示した焼結原料装入装置４２を有する焼結鉱製造装置１０を用いて第１の実施形態に係る焼結鉱の製造方法により成品焼結鉱を４８時間製造した実施例１を説明する。実施例１の発明例１では、搬送コンベア３０に設けた赤外線分析計３２を用いて、焼結原料のＣａＯの成分濃度を１時間に１回の頻度で連続測定する測定工程を実施した。そして、測定工程で連続測定されたＣａＯの成分濃度を用いて、装入層の装入密度が予め定められた目標値になるように装入ゲートの開度を１時間に１回の頻度で調整する調整工程を実施しながら焼結鉱を４８時間製造した。 (Example 1)
Example 1 in which a finished sinter was produced for 48 hours by the method for producing a sinter according to the first embodiment using the sinter production apparatus 10 having the sinter raw material charging apparatus 42 shown in FIG. explain. In Invention Example 1 of Example 1, a measurement step was carried out in which the component concentration of CaO as a sintering raw material was continuously measured once an hour by using an infrared analyzer 32 provided on the transport conveyor 30. Then, using the CaO component concentration continuously measured in the measurement step, the opening of the charging gate is set once an hour so that the charging density of the charging layer becomes a predetermined target value. The sinter was produced for 48 hours while performing the adjusting step.

図４は、発明例１におけるＣａＯ濃度と、擬似粒子径と、装入ゲートの開度と、装入厚と、生産ベースの変動を示すグラフである。図４（ａ）は、焼結原料ＣａＯ濃度（質量％）の変動を示し、図４（ｂ）は擬似粒子径（ｍｍ）の変動を示し、図４（ｃ）は装入ゲートの開度（％）の変動を示し、図４（ｄ）は装入厚（ｍｍ）の変動を示し、図４（ｅ）は焼結鉱の生産ベース（ｔ／ｈ）の変動を示す。図４（ａ）〜（ｄ）に共通する横軸は、経過時間（ｈ）である。なお、図４（ｃ）は装入厚の変動を示すが、装入厚が厚くなると装入層の装入密度も高くなり、装入厚が薄くなると装入層の装入密度も低くなる。このように、装入厚と装入密度は１対１で対応するので、装入厚の変動が小さくなれば装入密度の変動も小さくなる。 FIG. 4 is a graph showing the CaO concentration, the pseudo particle size, the opening degree of the charging gate, the charging thickness, and the fluctuation of the production base in Invention Example 1. FIG. 4A shows fluctuations in the CaO concentration (mass%) of the sintered raw material, FIG. 4B shows fluctuations in the pseudo particle size (mm), and FIG. 4C shows the opening degree of the charging gate. The variation of (%) is shown, FIG. 4 (d) shows the variation of the charge thickness (mm), and FIG. 4 (e) shows the variation of the production base (t / h) of the sinter. The horizontal axis common to FIGS. 4A to 4D is the elapsed time (h). Although FIG. 4 (c) shows the fluctuation of the charging thickness, the charging density of the charging layer increases as the charging thickness increases, and the charging density of the charging layer decreases as the charging thickness decreases. .. In this way, since the charging thickness and the charging density have a one-to-one correspondence, the smaller the fluctuation of the charging thickness, the smaller the fluctuation of the charging density.

鉄含有原料１２の原料パイルは、およそ６日に１度の頻度で他の原料パイルに切り換わる。発明例１において、原料パイルの切り換えは、図中の３０時間経過時点で実施された。 The raw material pile of the iron-containing raw material 12 is switched to another raw material pile at a frequency of about once every 6 days. In Invention Example 1, the switching of the raw material pile was carried out at the time when 30 hours had elapsed in the figure.

発明例１では、図４（ａ）に示すように、焼結原料のＣａＯ濃度が増加し、これにより、図４（ｂ）に示すように、擬似粒子径も大きくなった。発明例１では、測定工程によりＣａＯの成分濃度を連続測定しているので、図４（ａ）に示したＣａＯの成分濃度の増加傾向を迅速に把握でき、擬似粒子径が大きくなって装入密度が低下することが予測できる。このため、発明例１では、装入密度が予め定められた目標とする装入密度になるように、図４（ｃ）に示すように、１４時間経過後から３１時間経過後まで段階的に装入ゲートの開度を増加させる調整工程を実施した。具体的には、発明例１では、以下の表１に示すＣａＯ濃度と装入ゲートの開度の対応表に従いゲート開度を調整した。 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 CaO component concentration is continuously measured by the measuring step, the increasing tendency of the CaO component concentration shown in FIG. 4A can be quickly grasped, and the pseudo particle size becomes large to charge. It can be predicted that the density will decrease. Therefore, in Invention Example 1, as shown in FIG. 4C, the charging density is gradually set to a predetermined target charging density from the lapse of 14 hours to the lapse of 31 hours. An adjustment process was carried out to increase the opening of the charging gate. Specifically, in Invention Example 1, the gate opening degree was adjusted according to the correspondence table between the CaO concentration and the opening degree of the charging gate shown in Table 1 below.

Figure 0006874780
Figure 0006874780

装入ゲートの開度を調整しなければ装入層の装入密度は低下する所、発明例１では上述した装入ゲートの開度の調整によって装入密度が高められ、この結果、図４（ｄ）に示すように、装入密度を目標とする装入密度にでき、かつ、装入密度の変動も小さくなった。このように、装入密度を目標とする装入密度にし、かつ、装入密度の変動を小さくすることで発明例１では、図４（ｅ）に示すように、焼結鉱の生産ベースを高い状態で維持できた。 Where the charging density of the charging layer decreases unless the opening of the charging gate is adjusted, in Invention Example 1, the charging density is increased by adjusting the opening of the charging gate described above, and as a result, FIG. As shown in (d), the charging density can be set as the target charging density, and the fluctuation of the charging density is also small. In this way, by setting the charging density as the target charging density and reducing the fluctuation of the charging density, in Invention Example 1, as shown in FIG. 4 (e), the production base of the sinter is used. I was able to keep it high.

実施例１の比較例１では、焼結原料のＣａＯの成分濃度を連続測定する測定工程を実施していない。比較例１では、３０時間経過時点の原料パイルの切り換え時に、オフラインで焼結原料のＣａＯの成分濃度を測定し、当該測定値を用いて装入層の装入密度が予め定められた目標値になるように装入ゲートの開度を調整して焼結鉱を４８時間製造した。 In Comparative Example 1 of Example 1, the measurement step of continuously measuring the component concentration of CaO as a sintering raw material is not carried out. In Comparative Example 1, when the raw material pile was switched after 30 hours, the CaO component concentration of the sintered raw material was measured offline, and the charging density of the charging layer was set to a predetermined target value using the measured value. The sinter was produced for 48 hours by adjusting the opening degree of the charging gate so as to be.

図５は、比較例１におけるＣａＯ濃度と、擬似粒子径と、装入ゲートの開度と、装入厚と、生産ベースの変動を示すグラフである。図５（ａ）は、焼結原料ＣａＯ濃度（質量％）の変動を示し、図５（ｂ）は擬似粒子径（ｍｍ）の変動を示し、図５（ｃ）は装入ゲートの開度（％）の変動を示し、図５（ｄ）は装入厚（ｍｍ）の変動を示し、図５（ｅ）は焼結鉱の生産ベース（ｔ／ｈ）の変動を示す。図５（ａ）〜（ｄ）に共通する横軸は、経過時間（ｈ）である。比較例１においても原料パイルの切り換えは３０時間経過時点で実施された。なお、図５（ａ）において、１時間ごとに○プロットを示しているが、これは測定された成分濃度の値ではなく、パイル切り換え時に測定された各成分濃度を示している。 FIG. 5 is a graph showing the CaO concentration, the pseudo particle size, the opening degree of the charging gate, the charging thickness, and the fluctuation of the production base in Comparative Example 1. FIG. 5 (a) shows fluctuations in the CaO concentration (mass%) of the sintered raw material, FIG. 5 (b) shows fluctuations in the pseudo particle size (mm), and FIG. 5 (c) shows the opening degree of the charging gate. The variation of (%) is shown, FIG. 5 (d) shows the variation of the charge thickness (mm), and FIG. 5 (e) shows the variation of the production base (t / h) of the sinter. 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 carried out after 30 hours had passed. In addition, 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.

実施例１の比較例１では、３０時間経過時点の原料パイルの切り換え時に、オフライン測定で焼結原料のＣａＯの成分濃度を測定し、当該測定値を用いて装入ゲートの開度を調整した。しかしながら、焼結鉱製造中におけるＣａＯの成分濃度の変動に対応できず、図５（ｄ）に示すように、比較例１では、装入密度の変動が大きくなった。この装入密度の変動により、比較例１では、図５（ｅ）に示すように、焼結鉱の生産ベースの変動も大きくなり、所々に大きな生産ベースの低下が確認された。 In Comparative Example 1 of Example 1, when the raw material pile was switched after 30 hours, the CaO component concentration of the sintered raw material was measured by offline measurement, and the opening degree of the charging gate was adjusted using the measured value. .. However, it was not possible to cope with the fluctuation of the component concentration of CaO during the production of the sinter, and as shown in FIG. 5D, the fluctuation of the charging density became large in Comparative Example 1. Due to this fluctuation in the charging density, in Comparative Example 1, as shown in FIG. 5 (e), the fluctuation in the production base of the sinter became large, and a large decrease in the production base was confirmed in some places.

このように、第１の実施形態に係る焼結鉱の製造方法では、焼結鉱製造中における焼結原料のＣａＯの成分濃度が変動したとしても、当該成分濃度の変動に対応させて装入層の装入密度が予め定められた装入密度になるように装入ゲートの開度を調整する。これにより、装入層の装入密度の変動が小さくなり焼結鉱の生産ベースの低下が抑制されることが確認された。 As described above, in the method for producing sinter according to the first embodiment, even if the component concentration of CaO of the sinter raw material fluctuates during the production of the sinter, charging is performed in response to the fluctuation of the component concentration. The opening degree of the charging gate is adjusted so that the charging density of the layer becomes a predetermined charging density. As a result, 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 sinter was suppressed.

（実施例２）
次に、図３に示した焼結原料装入装置４３を有する焼結鉱製造装置１０を用いて第２の実施形態に係る焼結鉱の製造方法で成品焼結鉱を４８時間製造した実施例２を説明する。実施例２の発明例２では、搬送コンベア３０に設けた赤外線分析計３２を用いて、焼結原料のＦｅＯの成分濃度を１時間に１回の頻度で連続測定する測定工程を実施した。そして、測定工程で連続測定されたＦｅＯの成分濃度を用いて、焼結原料の装入速度が予め定められた目標値になるように装入ゲートの開度を１時間に１回の頻度で調整する調整工程を実施しながら焼結鉱を４８時間製造した。 (Example 2)
Next, the finished sinter was produced for 48 hours by the method for producing sinter according to the second embodiment using the sinter production apparatus 10 having the sinter raw material charging apparatus 43 shown in FIG. Example 2 will be described. In Invention Example 2 of Example 2, a measurement step was carried out in which the component concentration of FeO as a sintering raw material was continuously measured once an hour by using an infrared analyzer 32 provided on the transport conveyor 30. Then, using the component concentration of FeO continuously measured in the measurement step, the opening of the charging gate is set once an hour so that the charging speed of the sintered raw material becomes a predetermined target value. The sinter was produced for 48 hours while performing the adjusting step.

図６は、発明例２におけるＦｅＯ濃度と、装入ゲートの開度と、装入層の装入厚と、生産ベースの変動を示すグラフである。図６（ａ）は、焼結原料のＦｅＯ濃度（質量％）の変動を示し、図６（ｂ）は装入ゲートの開度（％）を示し、図６（ｃ）は装入厚（ｍｍ）の変動を示し、図６（ｄ）は焼結鉱の生産ベース（ｔ／ｈ）の変動を示す。図６（ａ）〜（ｄ）に共通する横軸は、経過時間（ｈ）である。 FIG. 6 is a graph showing the FeO concentration in Invention Example 2, the opening degree of the charging gate, the charging thickness of the charging layer, and the fluctuation of the production base. FIG. 6 (a) shows fluctuations in the FeO concentration (mass%) of the sintered raw material, FIG. 6 (b) shows the opening degree (%) of the charging gate, and FIG. 6 (c) shows the charging thickness ( The fluctuation of mm) is shown, and FIG. 6 (d) shows the fluctuation of the production base (t / h) of the sinter. The horizontal axis common to FIGS. 6A to 6D is the elapsed time (h).

鉄含有原料１２の原料パイルは、およそ６日に１度の頻度で他の原料パイルに切り換わる。発明例２において、原料パイルの切り換えは３０時間経過時点で実施された。 The raw material pile of the iron-containing raw material 12 is switched to another raw material pile at a frequency of about once every 6 days. In Invention Example 2, the switching of the raw material pile was carried out after 30 hours had passed.

発明例２では、ＦｅＯの成分濃度を連続測定しているので、図６（ａ）に示したＦｅＯの成分濃度の低下傾向を迅速に把握でき、装入速度が速くなって装入層の装入密度が高くなることが予測できる。このため、発明例２では、予め定められた目標とする装入密度になるように、図６（ｂ）に示すように装入ゲートの開度を１５時間経過後から段階的に小さくする調整工程を実施した。具体的には、発明例２では、以下の表２に示すＦｅＯ濃度と装入ゲートの開度の対応表に従いゲート開度を調整した。 In Invention Example 2, since the FeO component concentration is continuously measured, the decreasing tendency of the FeO component concentration shown in FIG. 6A can be quickly grasped, and the charging speed becomes faster to load the charging layer. It can be predicted that the ingress density will increase. Therefore, in Invention Example 2, as shown in FIG. 6B, the opening degree of the charging gate is adjusted to be gradually reduced after 15 hours have passed so that the charging density becomes a predetermined target charging density. The process was carried out. Specifically, in Invention Example 2, the gate opening degree was adjusted according to the correspondence table between the FeO concentration and the opening degree of the charging gate shown in Table 2 below.

Figure 0006874780
Figure 0006874780

装入ゲートの開度を調整しなければ、装入速度が速くなって装入層の装入密度が高くなる所、上述した装入ゲートの開度の調整によって装入密度が下げられ、この結果、図６（ｃ）に示すように、装入密度を目標とする装入密度にでき、かつ、装入密度の変動も小さくなった。このように、装入密度を目標とする装入密度にし、かつ、装入密度の変動を小さくすることで発明例２では、図６（ｄ）に示すように、焼結鉱の生産ベースを高い状態で維持できた。 If the opening of the charging gate is not adjusted, the charging speed will increase and the charging density of the charging layer will increase. However, the charging density will be reduced by adjusting the opening of the charging gate described above. As a result, as shown in FIG. 6 (c), the charging density can be set as the target charging density, and the fluctuation of the charging density is also small. In this way, by setting the charging density as the target charging density and reducing the fluctuation of the charging density, in Invention Example 2, as shown in FIG. 6D, the production base of the sinter is used. I was able to keep it high.

実施例２の比較例２では、焼結原料のＦｅＯの成分濃度を連続測定する測定工程を実施していない。比較例２では、３０時間経過時点の原料パイルの切り換え時に、オフラインで焼結原料のＦｅＯの成分濃度を測定し、当該測定値を用いて装入層の装入密度が予め定められた目標値になるように装入ゲートの開度を調整して焼結鉱を４８時間製造した。 In Comparative Example 2 of Example 2, the measurement step of continuously measuring the component concentration of FeO of the sintering raw material is not carried out. In Comparative Example 2, when the raw material pile was switched after 30 hours, the FeO component concentration of the sintered raw material was measured offline, and the charging density of the charging layer was set to a predetermined target value using the measured value. The sinter was produced for 48 hours by adjusting the opening degree of the charging gate so as to be.

図７は、比較例２におけるＦｅＯ濃度と、装入ゲートの開度と、装入層の装入厚と、生産ベースの変動を示すグラフである。図７（ａ）は、焼結原料のＦｅＯ濃度（質量％）の変動を示し、図７（ｂ）は装入ゲートの開度（％）を示し、図７（ｃ）は装入厚（ｍｍ）の変動を示し、図７（ｄ）は、焼結鉱の生産ベース（ｔ／ｈ）の変動を示す。図７（ａ）〜（ｄ）に共通する横軸は、経過時間（ｈ）である。比較例２においても原料パイルの切り換えは３０時間経過時点で実施された。なお、図７（ａ）において、１時間ごとに○プロットを示しているが、これは測定された成分濃度の値ではなく、原料パイル切り換え時に測定された各成分濃度を示している。 FIG. 7 is a graph showing the FeO concentration in Comparative Example 2, the opening degree of the charging gate, the charging thickness of the charging layer, and the fluctuation of the production base. FIG. 7 (a) shows the fluctuation of the FeO concentration (mass%) of the sintered raw material, FIG. 7 (b) shows the opening degree (%) of the charging gate, and FIG. 7 (c) shows the charging thickness ( The variation of mm) is shown, and FIG. 7 (d) shows the variation of the production base (t / h) of the sinter. The horizontal axis common to FIGS. 7 (a) to 7 (d) is the elapsed time (h). Also in Comparative Example 2, the switching of the raw material pile was carried out after 30 hours had passed. In addition, 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 switching the raw material pile.

実施例２の比較例２では、３０時間経過時点の原料パイルの切り換え時に、オフライン測定で焼結原料のＦｅＯの成分濃度を測定し、当該測定値を用いて装入ゲートの開度を調整した。しかしながら、焼結鉱製造中におけるＦｅＯの成分濃度の変動に対応できず、図７（ｃ）に示すように、比較例２では、装入密度の変動が大きくなった。この装入密度の変動により、比較例２では、図７（ｄ）に示すように、焼結鉱の生産ベースの変動も大きくなり、所々に大きな生産ベースの低下が確認された。 In Comparative Example 2 of Example 2, when the raw material pile was switched after 30 hours, the FeO component concentration of the sintered raw material was measured by offline measurement, and the opening degree of the charging gate was adjusted using the measured value. .. However, it was not possible to cope with the fluctuation of the component concentration of FeO during the production of the sinter, and as shown in FIG. 7C, the fluctuation of the charging density became large in Comparative Example 2. Due to this fluctuation in the charging density, in Comparative Example 2, as shown in FIG. 7 (d), the fluctuation in the production base of the sinter became large, and a large decrease in the production base was confirmed in some places.

発明例２と比較例２における装入厚の平均値と、装入厚の変動と、４８時間の成品焼結鉱の製造における成品焼結鉱生産率を下記表３に示す。成品焼結鉱生産率とは、図６（ｄ）および図７（ｄ）に示した焼結鉱の生産ベースに、焼結原料から焼結によって気化する成分を除いた割合である焼結歩留と、篩分け装置７０による成品焼結鉱歩留とを乗じた値を、焼結機４０のパレット台車４４の焼結面積で除した値である。

Figure 0006874780
Table 3 below shows the average value of the charge thickness in Invention Example 2 and Comparative Example 2, the fluctuation of the charge 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 sinter raw material minus the components vaporized by sinter to the sinter production base shown in FIGS. 6 (d) and 7 (d). It is a value obtained by multiplying the distillate by the yield of the product sintered ore produced by the sintering device 70 and dividing by the sintering area of the pallet trolley 44 of the sintering machine 40.
Figure 0006874780

表３に示すように、発明例２の装入厚の変動は比較例２よりも小さくなり、発明例２の成品焼結鉱の生産率は比較例２よりも高くなった。このように、本実施形態に係る焼結鉱の製造方法を実施することで、装入密度を目標とする装入密度にでき、かつ、装入密度の変動を小さくでき、これにより、成品焼結鉱の生産率の向上が実現できることが確認された。 As shown in Table 3, the variation in the charge thickness of Invention Example 2 was smaller than that of Comparative Example 2, and the production rate of the product sinter of Invention Example 2 was higher than that of Comparative Example 2. In this way, by implementing the method for producing the sinter according to the present embodiment, the charging density can be set to the target charging density and the fluctuation of the charging density can be reduced, whereby the product baking can be performed. It was confirmed that the production rate of sinter could be improved.

１０ 焼結鉱製造装置
１１ ヤード
１２ 鉄含有原料
１４ 搬送コンベア
１６ ＣａＯ含有原料
１７ ＭｇＯ含有原料
１８ 凝結材
２０ 原料供給部
２２ 配合槽
２４ 配合槽
２５ 配合槽
２６ 配合槽
２８ 配合槽
３０ 搬送コンベア
３２ 赤外線分析計
３４ 水
３６ ドラムミキサー
３８ 搬送コンベア
４０ 焼結機
４２ 焼結原料装入装置
４３ 焼結原料装入装置
４４ パレット台車
４６ 点火炉
４７ 気体燃料供給装置
４８ ウインドボックス
５０ 破砕機
６０ 冷却機
７０ 篩分け装置
７２ 成品焼結鉱
７４ 返鉱
７６ 搬送コンベア
７８ 搬送コンベア
８０ 高炉
８２ 給鉱ホッパー
８４ ドラムフィーダー
８６ 装入ゲート
８８ シュート
９０ 矢印
９２ 矢印
９４ 磁気ブレーキ
９６ 位置調整装置
９８ 磁石 10 Sintered ore production equipment 11 yards 12 Iron-containing raw material 14 Conveyor conveyor 16 CaO-containing raw material 17 MgO-containing raw material 18 Coagulant 20 Raw material supply unit 22 Mixing tank 24 Mixing tank 25 Mixing tank 26 Mixing tank 28 Mixing tank 30 Conveyor 32 Infrared Analyzer 34 Water 36 Drum mixer 38 Conveyor conveyor 40 Sintering machine 42 Sintering raw material charging device 43 Sintering raw material charging device 44 Pallet carriage 46 Ignition furnace 47 Gas fuel supply device 48 Windbox 50 Crusher 60 Cooler 70 Sieve Separation device 72 Sintered ore 74 Return ore 76 Conveyor conveyor 78 Conveyor 80 Blast furnace 82 Mining hopper 84 Drum feeder 86 Loading gate 88 Chute 90 Arrow 92 Arrow 94 Magnetic brake 96 Positioning device 98 Magnet

Claims (6)

少なくとも鉄含有原料、ＣａＯ含有原料および凝結材が配合された焼結原料を造粒し、造粒された前記焼結原料を焼結機の原料装入装置からパレット台車に装入して装入層を形成させ、前記装入層を焼結機で焼結して焼結鉱を製造する焼結鉱の製造方法であって、
前記原料装入装置は、装入ゲートと、シュートとを備え、
搬送コンベア上を搬送される前記鉄含有原料、前記焼結原料および前記造粒された焼結原料のうち少なくとも１つに赤外線、レーザー、中性子、マイクロ波のいずれか１つ以上を照射する分析装置を用いて成分濃度を連続測定する測定工程と、
前記測定工程で測定された成分濃度を用いて、前記装入層の装入厚が予め定められた装入厚になるように前記装入ゲートの開度および前記シュートの水平面に対する傾斜角度のうち少なくとも１つを調整する調整工程と、
を有する、焼結鉱の製造方法。 A sintered raw material containing at least an iron-containing raw material, a CaO-containing raw material, and a coagulant is granulated, and the granulated sintered raw material is charged into a pallet carriage from a raw material charging device of a sintering machine. A method for producing sinter, which forms a layer and sinters the charged layer with a sinter to produce sinter.
The raw material charging device includes a charging gate and a chute.
An analyzer that irradiates at least one of the iron-containing raw material, the sintered raw material, and the granulated sintered raw material transported on the transport conveyor with one or more of infrared rays, lasers, neutrons, and microwaves. And the measurement process of continuously measuring the component concentration using
Using the ingredients concentration measured by the measuring step, of the angle of inclination with respect to the opening and a horizontal plane of the chute of the loading gate so that the charged thickness charged thickness predetermined for the sintering bed An adjustment process that adjusts at least one,
A method for producing sinter. 前記測定工程では、少なくともＣａＯの成分濃度を連続測定する、請求項１に記載の焼結鉱の製造方法。 The method for producing a sinter according to claim 1, wherein in the measuring step, at least the component concentration of CaO is continuously measured. 少なくとも鉄含有原料、ＣａＯ含有原料および凝結材が配合された焼結原料を造粒し、造粒された前記焼結原料を焼結機の原料装入装置からパレット台車に装入して装入層を形成させ、前記装入層を焼結機で焼結して焼結鉱を製造する焼結鉱の製造方法であって、
前記原料装入装置は、装入ゲートと、シュートと、磁気ブレーキと備え、
搬送コンベア上を搬送される前記鉄含有原料、前記焼結原料および前記造粒された焼結原料のうち少なくとも１つに赤外線、レーザー、中性子、マイクロ波のいずれか１つ以上を照射する分析装置を用いて成分濃度を連続測定する測定工程と、
前記測定工程で測定された成分濃度を用いて、前記装入層の装入厚が予め定められた装入厚になるように前記装入ゲートの開度、前記シュートの水平面に対する傾斜角度および前記磁気ブレーキの磁力のうち少なくとも１つを調整する調整工程と、
を有する、焼結鉱の製造方法。 A sintered raw material containing at least an iron-containing raw material, a CaO-containing raw material, and a coagulant is granulated, and the granulated sintered raw material is charged into a pallet carriage from a raw material charging device of a sintering machine. A method for producing sinter, which forms a layer and sinters the charged layer with a sinter to produce sinter.
The raw material charging device includes a charging gate, a chute, and a magnetic brake.
An analyzer that irradiates at least one of the iron-containing raw material, the sintered raw material, and the granulated sintered raw material transported on the transport conveyor with one or more of infrared rays, lasers, neutrons, and microwaves. And the measurement process of continuously measuring the component concentration using
Using the ingredients concentration measured by the measuring step, the charging gate opening as charged thickness of the sintering bed is charged thickness predetermined inclination angle and the relative to the horizontal plane of the chute An adjustment process that adjusts at least one of the magnetic forces of the magnetic brake,
A method for producing sinter. 前記測定工程では、少なくともＦｅＯの成分濃度を連続測定する、請求項３に記載の焼結鉱の製造方法。 The method for producing a sinter according to claim 3, wherein in the measuring step, at least the component concentration of FeO is continuously measured. 前記測定工程で連続測定されたＣａＯの成分濃度が高くなるほど、前記調整工程では前記装入ゲートの開度および前記シュートの水平面に対する傾斜角度のうち少なくとも１つを増加させる、請求項２に記載の焼結鉱の製造方法。 The second aspect of the present invention , wherein the higher the concentration of the CaO component continuously measured in the measuring step, the more the opening degree of the charging gate and the inclination angle of the chute with respect to the horizontal plane are increased in the adjusting step. Method for producing sintered ore. 前記測定工程で連続測定されたＦｅＯの成分濃度が高くなるほど、前記調整工程では前記装入ゲートの開度を増加させる、前記シュートの水平面に対する傾斜角度を増加させる、および、前記磁気ブレーキの磁力を弱める、のうち少なくとも１つを実施する、請求項４に記載の焼結鉱の製造方法。 As the concentration of FeO components continuously measured in the measurement step increases, the opening degree of the charging gate is increased, the inclination angle of the chute with respect to the horizontal plane is increased, and the magnetic force of the magnetic brake is increased in the adjustment step. The method for producing a sinter according to claim 4, wherein at least one of weakening is carried out.
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