JPH11209827A - Production of sintered ore - Google Patents
Production of sintered oreInfo
- Publication number
- JPH11209827A JPH11209827A JP2785598A JP2785598A JPH11209827A JP H11209827 A JPH11209827 A JP H11209827A JP 2785598 A JP2785598 A JP 2785598A JP 2785598 A JP2785598 A JP 2785598A JP H11209827 A JPH11209827 A JP H11209827A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- layer
- sintering
- mmaq
- packed bed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は高炉製造法の原料で
ある焼結鉱を製造する際の生産性を向上する方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving productivity in producing sintered ore, which is a raw material of a blast furnace production method.
【０００２】[0002]
【従来の技術】鉄鉱石の焼結に関しては、ドワイトロイ
ド式焼結機が広く用いられている。これは、原料粉鉱石
に石灰石や珪石等の溶剤と粉コークス等の燃料と水とを
加えて混合、造粒した配合原料を、キャタピラ状に配列
した焼結パレット上に充填して原料充填層を形成し、焼
結パレットを順次水平移動して、点火炉内で充填層の表
面に点火した後、下方から吸引して、配合原料内のコー
クス等の燃料を燃焼させ、発生した熱で原料粉鉱石を溶
融、凝固し、燃焼帯を漸次表層部から下層部に移行させ
て焼結するもので、焼結時間は２０〜４０分程度であ
る。2. Description of the Related Art For sintering of iron ore, a Dwyroid type sintering machine is widely used. In this method, a raw material ore is added with a solvent such as limestone or silica stone, a fuel such as coke breeze and water, and mixed and granulated. The sintering pallet is sequentially moved horizontally, and the surface of the packed bed is ignited in the ignition furnace, and then sucked from below to burn the fuel such as coke in the blended raw material. The ore is melted and solidified, and the combustion zone is gradually shifted from the surface layer to the lower layer for sintering. The sintering time is about 20 to 40 minutes.
【０００３】グリーナワルド式焼結機等のような他の回
分式焼結機に比べて、ドワイトロイド式焼結機は連続式
であり、大量生産に適しているのが広く用いられている
理由である。現在のドワイトロイド式焼結機は大型化し
ており、幅５ｍ×長さ１００ｍといったものまである
が、生産率は３４〜４３ｔ／ｄ／ｍ2 程度である。[0003] Compared with other batch-type sintering machines such as the Greenawald-type sintering machine, the Dwyroid type sintering machine is of a continuous type and is widely used because it is suitable for mass production. It is. Current Dwythroid type sintering machines are large and have a width of 5 m × length of 100 m, but the production rate is about 34 to 43 t / d / m 2 .
【０００４】ここで、世界的な資源事情を鑑みると、高
炉製造法の原料となる塊鉱石の供給量不足が顕著となっ
ており、これに伴い塊鉱石の価格も増大する一方なの
で、粉鉱石の多量使用が求められている。ただし、焼結
鉱の生産量を増大するために、焼結機を増設したり、あ
るいは焼結機を更に大型化したりすると多額の設備投資
が必要になってしまうので、焼結機の生産性向上が強く
求められている。また、焼結鉱の製造は、高炉製造法か
ら要求される成品焼結鉱の品質を維持して生産性を最大
とすると共に、風量原単位、ＮＯｘ排出量原単位を極力
抑制するような操業が求められる。[0004] In view of the global resource situation, there is a remarkable shortage of the supply of lump ore, which is a raw material of the blast furnace manufacturing method, and the price of lump ore is increasing along with this. There is a demand for the use of large amounts of. However, adding a sintering machine or increasing the size of the sintering machine in order to increase the amount of sintering ore production would require a large amount of capital investment. Improvement is strongly demanded. In addition, the production of sintered ore is an operation that maintains the quality of the product sintered ore required from the blast furnace manufacturing method to maximize productivity and minimizes the unit air volume and the unit NOx emission. Is required.
【０００５】従来、焼結鉱の生産増を設備面から図るた
めには、焼結のストランドを延長して焼結面積を増加さ
せたり、単に吸引負圧を増加して原料充填層への通過風
量を増したりする等の方策が採られてきた。Conventionally, in order to increase the production of sinter from the equipment side, it is necessary to extend the sintering strand to increase the sintering area, or simply increase the suction negative pressure to pass the sinter to the raw material packed bed. Measures such as increasing the air volume have been taken.
【０００６】[0006]
【発明が解決しようとする課題】焼結操業は、焼結機の
点火炉から排鉱部までのストランド内で上層から下層ま
でを焼成する必要があるが、従来の生産性向上の技術は
いずれも焼結パレット上の原料充填層の層厚が４００〜
６００ｍｍ程度の操業を前提にしている。In the sintering operation, it is necessary to fire from the upper layer to the lower layer in the strand from the ignition furnace of the sintering machine to the mining section. The thickness of the raw material filling layer on the sintering pallet is 400 ~
It is assumed that the operation is about 600 mm.
【０００７】生産量を現状よりも著しく向上させるため
には、原料充填層の層厚および／またはパレット移動速
度を増大させ、焼結機のストランド長さを延長させる必
要がある。しかし、焼結機のストランドの延長は、７０
〜１００ｍのストランドを１２０ｍ程度まで延長するの
が設備的な限界である。なぜならば、これ以上にストラ
ンドを長くすると、レール上を移動し無端状につながっ
ている焼結パレットが蛇行してしまうのを押さえること
ができず、スプロケットの回転が停止したり、脱線して
しまう等の設備トラブルが起きてしまうからである。ま
た、スプロケットを増強して大きな引っ張り力で回転さ
せようとすると、焼結パレット間の連結部や架構の強度
がもたない等の問題が起こる。従って、最大のストラン
ド延長を実施しても、表層部から漸次下層部に移行する
燃焼溶融帯の移行速度が同じであれば、１〜３割程度の
生産量の増加に留まっているのが現状であった。[0007] In order to significantly increase the production volume compared to the current situation, it is necessary to increase the layer thickness of the raw material packed bed and / or the moving speed of the pallet and extend the strand length of the sintering machine. However, the extension of the sintering machine strand is 70
Extending a strand of about 100 m to about 120 m is the limit of equipment. Because, if the strand is longer than this, the sintering pallet that moves on the rail and is connected endlessly can not be suppressed from meandering, the rotation of the sprocket will stop or the wire will derail. This is because such equipment troubles may occur. In addition, if the sprocket is strengthened and rotated with a large pulling force, a problem such as a lack of strength of a connecting portion between the sintered pallets and a frame occurs. Therefore, even if the maximum strand elongation is implemented, if the transition speed of the combustion and melting zone that gradually transitions from the surface layer to the lower layer is the same, the current increase is only about 30 to 30%. Met.
【０００８】したがって、従来以上に生産性を向上させ
るためには、原料充填層内の上層から下層への燃焼溶融
帯の移行速度の向上が課題である。[0008] Therefore, in order to improve the productivity more than ever before, there is a problem of improving the transfer speed of the combustion melting zone from the upper layer to the lower layer in the raw material packed layer.
【０００９】燃焼溶融帯の移行速度を増加させるために
は、吸引ブロアーの負圧を増大して送風速度を増加さ
せ、原料充填層への酸素の供給量を増加させることが考
えられる。しかし、原料層上層部の成品歩留、焼結鉱の
品質低下を防止するには上層部の焼成過程の高温保熱指
数を保つ必要があるため、上層部の焼成においては燃焼
溶融帯の移行速度を現状より増加できない。さらに、大
幅に吸引ブロアーの負圧を増大すると、中下層部におい
ても、焼成過程の高温保熱指数が低下し、焼結鉱の強度
不足や焼結鉱品質の悪化を招く問題があって、実際には
採用できないでいた。[0009] In order to increase the transfer speed of the combustion melting zone, it is conceivable to increase the negative pressure of the suction blower to increase the blowing speed, thereby increasing the supply amount of oxygen to the raw material packed bed. However, since it is necessary to maintain a high-temperature heat retention index during the firing process of the upper layer in order to prevent the product yield of the upper layer of the raw material layer and to prevent the quality of the sintered ore from deteriorating, the transition of the combustion melting zone occurs during firing of the upper layer. The speed cannot be increased from the current state. Furthermore, when the negative pressure of the suction blower is significantly increased, even in the middle and lower layers, there is a problem that the high-temperature heat retention index in the sintering process decreases, leading to insufficient strength of the sinter or deterioration of the sinter quality. I couldn't actually adopt it.
【００１０】本発明は、燃焼溶融帯の移行速度を増加さ
せて、焼結機の原料充填層の高層厚化やパレットの移動
速度の増加により、生産性を大幅に向上できる焼結鉱の
製造方法を提供することを目的とする。According to the present invention, there is provided a method for manufacturing a sintered ore capable of greatly improving productivity by increasing the transition speed of a combustion melting zone, increasing the thickness of a raw material packed bed of a sintering machine, and increasing the moving speed of a pallet. The aim is to provide a method.
【００１１】[0011]
【課題を解決するための手段】本発明の焼結鉱製造方法
は以下の（１）〜（３）の通りである。The method for producing a sintered ore of the present invention is as follows (1) to (3).
【００１２】（１） 原料粉鉱石と溶剤と燃料とを含む
配合原料をドワイトロイド式焼結機のパレット上に装入
して原料充填層表層部に点火し、原料充填層上方から下
方へ酸素含有ガスを供給して焼結鉱を製造する方法にお
いて、原料粉鉱石と溶剤の合計に対して燃料を５．０〜
８．０ｗｔ％とし、原料充填層の層厚方向の差圧を２０
００〜５０００ｍｍＡｑとして焼結することを特徴とす
る焼結鉱製造方法。(1) A blended raw material containing a raw material powder ore, a solvent, and a fuel is charged on a pallet of a Dwyroid type sintering machine, and ignited on the surface layer of the raw material packed bed. In the method for producing a sintered ore by supplying a contained gas, the fuel is used in an amount of 5.0 to 5.0 with respect to the total amount of the raw material ore and the solvent.
8.0 wt%, and the differential pressure in the thickness direction of the raw material packed layer is 20
A method for producing a sintered ore, characterized in that the sintering is carried out at a temperature of 00 to 5000 mmAq.
【００１３】（２） （１）において、焼結パレット上
の原料充填層の上に酸素含有ガスを加圧供給する加圧フ
ードを設け、該加圧フード内を大気圧に対して１００〜
４９９９ｍｍＡｑに加圧するとともに、原料充填層の下
方から大気圧に対して−４９００〜−１ｍｍＡｑで吸引
することを特徴とする焼結鉱製造方法。(2) In (1), a pressurized hood for supplying a pressurized oxygen-containing gas is provided on the raw material packed layer on the sintering pallet, and the inside of the pressurized hood is set to 100 to atmospheric pressure.
A method for manufacturing a sintered ore, which comprises applying a pressure of 4900 to -1 mmAq with respect to the atmospheric pressure from below a raw material packed bed while pressurizing to 4999 mmAq.
【００１４】（３） （１）または（２）において、原
料充填層表層部に点火後、燃焼帯溶融の前線の位置が表
層から下方に層厚３０％以内であるストランド長さ方向
の範囲内の層厚方向の差圧を５００〜２０００ｍｍＡｑ
とし、前記範囲以降のストランド長さ方向の範囲の原料
充填層の層厚方向の差圧を２０００〜５０００ｍｍＡｑ
として焼結することを特徴とする焼結鉱製造方法。(3) In (1) or (2), after igniting the surface portion of the raw material packed layer, the position of the front of the melting of the combustion zone is within a range of 30% or less in the layer length direction below the surface layer. Of 500 to 2000 mmAq
And the differential pressure in the layer thickness direction of the raw material packed layer in the range of the strand length direction after the above range is 2000 to 5000 mmAq
Ore sintering method, characterized in that the sintering is performed.
【００１５】ここで、表１の例に示すように、配合原料
は種々の鉄鉱石および石灰石、生石灰、蛇紋岩、スケー
ル等の雑原料、返鉱、粉コークスから成る。返鉱配合率
と、粉コークス配合率は新原料の合計１００に対する重
量割合で示される。Here, as shown in the example of Table 1, the compounding raw material is composed of various iron ore and limestone, quicklime, serpentine, scale and other miscellaneous raw materials, returned ore, and coke breeze. The returned ore blending ratio and the coke breeze blending ratio are indicated by weight percentage with respect to the total 100 of the new raw materials.
【００１６】[0016]
【表１】 [Table 1]
【００１７】なお、本発明における差圧とは、原料充填
層の上層部直上の圧力と焼結パレット直下の圧力との差
を示す。In the present invention, the differential pressure refers to the difference between the pressure just above the upper layer of the raw material packed layer and the pressure just below the sintering pallet.
【００１８】本発明は、配合原料の粉コークス等の燃料
配合率を増加し、かつ原料充填層の層厚方向の差圧を増
加することで酸素含有ガスの供給量を増し、原料充填層
上層部の焼結の際の高温保熱指数を改善すると共に、燃
焼溶融帯の移行速度を増加させることができる。これら
により、高温保熱指数の低下を招くことなく燃焼溶融帯
の移行速度を増加することができるので、焼結機のスト
ランド長さを延長しなくても、焼結パレットの移動スピ
ードが増加でき、焼結機の生産率が飛躍的に向上でき
る。According to the present invention, the feed rate of the oxygen-containing gas is increased by increasing the blending ratio of the fuel such as coke breeze as a blended raw material and increasing the pressure difference in the thickness direction of the raw material packed layer. It is possible to improve the high-temperature heat retention index during sintering of the part and increase the transition speed of the combustion melting zone. With these, the transition speed of the combustion melting zone can be increased without lowering the high-temperature heat retention index, so that the moving speed of the sintering pallet can be increased without extending the strand length of the sintering machine. In addition, the production rate of the sintering machine can be dramatically improved.
【００１９】配合原料中の粉コークス等の燃料の配合率
は、従来の６００〜２０００ｍｍＡｑの差圧で操業して
いた際の新原料中の燃料は４．０〜５．０ｗｔ％程度で
あるが、本発明では設定する差圧や層厚にもよるが５．
０〜８．０ｗｔ％とする。８．０ｗｔ％を越えると、差
圧増加による冷却速度の増加があっても熱過剰となるこ
とは避けられず、２次ヘマタイトが増加して還元粉化性
が低下したり、過溶融部の直下にガスが流れずにムラ焼
けを引き起こしたりするなどの悪影響が出てしまう。The blending ratio of fuel such as coke breeze in the blended raw material is about 4.0-5.0 wt% for the fuel in the new raw material when the conventional fuel cell is operated at a differential pressure of 600-2000 mmAq. In the present invention, although it depends on the set differential pressure and the layer thickness, it is not limited to 5.
0 to 8.0 wt%. If it exceeds 8.0 wt%, excessive heat is inevitable even if the cooling rate is increased due to an increase in the differential pressure, and secondary hematite increases to reduce the reduction powderability, There is an adverse effect such as causing uneven burning without the gas flowing immediately below.
【００２０】原料充填層の層厚方向の差圧は、従来の６
００〜２０００ｍｍＡｑの差圧に対して、２０００〜５
０００ｍｍＡｑにする。２０００ｍｍＡｑ未満ではガス
供給量を増す効果が小さく、５０００ｍｍＡｑを越える
とガス流速が大きくなりすぎて、コークス燃焼速度が燃
焼溶融帯の移行速度に追いつかないことに加え、冷却速
度も大きくなり、焼成に必要な高温保熱指数を確保でき
なくなるからである。The pressure difference in the thickness direction of the raw material packed layer is 6
For a differential pressure of 00 to 2000 mmAq,
000 mmAq. If it is less than 2000 mmAq, the effect of increasing the gas supply amount is small, and if it exceeds 5000 mmAq, the gas flow velocity becomes too large, and the coke combustion speed cannot keep up with the transition speed of the combustion melting zone. This is because a high temperature heat retention index cannot be secured.
【００２１】原料充填層に供給する酸素含有ガスの原料
充填層上下の差圧を増加する手段としては、吸引ブロア
ーを増強あるいは増設して、高負圧で酸素含有ガスを吸
引することが好ましい。As means for increasing the pressure difference between the oxygen-containing gas supplied to the raw material packed bed and the raw material packed bed, it is preferable to increase or increase the suction blower to suck the oxygen-containing gas at a high negative pressure.
【００２２】あるいは、焼結パレットの上面を覆うフー
ドを設け、フード内を加圧して、上方から原料充填層に
加圧送風するとともに、パレット直下にあるウインドボ
ックス内の圧力を調整し、原料充填層内の圧力を大気圧
超にし、かつ原料充填層下方に対する原料充填層上方の
差圧を制御して、原料充填層の上方から下方に加圧送風
することも好ましい。このようにして、従来は大気圧未
満であった原料充填層内の圧力を本発明では大気圧超に
増加させ、原料充填層の上方と下方の差圧を調節して、
実ガス風量は同じでも標準状態の風量を増加させること
により、原料充填層内のガス密度を従来よりも大きくで
きる。その結果、原料充填層内への酸素供給量が増加す
るため原料充填層中のコークス燃焼速度を大きくでき、
さらに原料充填層内の圧力上昇で気体−固体間の伝熱速
度も増加して、燃焼溶融帯の移行速度を増加できる。Alternatively, a hood for covering the upper surface of the sintering pallet is provided, and the inside of the hood is pressurized and blown to the raw material filling layer from above, and the pressure in the wind box immediately below the pallet is adjusted to supply the raw material. It is also preferable that the pressure in the layer be higher than the atmospheric pressure and the pressure difference between the upper part of the raw material packed bed and the lower part of the raw material packed bed be controlled so that the air is blown from above the raw material packed bed to below. In this way, the pressure in the raw material packed bed, which was conventionally lower than the atmospheric pressure, is increased to the atmospheric pressure in the present invention, and the pressure difference between the upper and lower parts of the raw material packed bed is adjusted,
Even if the actual gas flow rate is the same, the gas density in the raw material packed bed can be made larger than before by increasing the standard flow rate. As a result, the amount of oxygen supplied into the raw material packed bed increases, so that the coke burning rate in the raw material packed bed can be increased,
Further, the heat transfer rate between the gas and the solid increases due to the increase in the pressure in the raw material packed bed, and the transfer speed of the combustion melting zone can be increased.
【００２３】ここで、フード内を加圧する範囲を１００
ｍｍＡｑ以上としたのは、１００ｍｍＡｑ未満では原料
充填層内のガス密度を上げて酸素供給量を増加させたと
きのコークス燃焼速度を大きくする効果が小さく、ま
た、４９９９ｍｍＡｑ以下としたのは、４９９９ｍｍＡ
ｑを越えるとガス流速が大きくなりすぎてコークスの一
部が吹き消えてしまう問題と、焼結パレットの上面を覆
うフードのシールが困難になる問題があるからである。Here, the range in which the inside of the hood is pressurized is 100
The reason why the pressure is not less than 100 mmAq is that the effect of increasing the gas density in the raw material packed bed and increasing the coke burning rate when the oxygen supply amount is increased is small.
If it exceeds q, there is a problem that the gas flow velocity becomes too large and part of the coke blows out, and a problem that it is difficult to seal a hood that covers the upper surface of the sintered pallet.
【００２４】また、吸引する負圧の範囲を−４９００ｍ
ｍＡｑ以上としたのは、従来から焼結機の課題である漏
風増加を避けるためであり、また、−１ｍｍＡｑ以下と
したのは、排ガスを吸引するのに必要な負圧だからであ
る。The range of the negative pressure to be suctioned is -4900 m.
The reason for setting the value to be equal to or greater than mAq is to avoid an increase in air leakage, which has been a problem of a sintering machine, and the value equal to or smaller than -1 mmAq is because of a negative pressure required for sucking exhaust gas.
【００２５】原料充填層に供給する酸素含有ガスの原料
充填層上下の差圧は、原料充填層表層部の点火後に燃焼
溶融帯の前線（最下部）位置が表層から下方に層厚３０
％以内であるストランド長さ方向の範囲内の層厚方向の
差圧を従来の５００〜２０００ｍｍＡｑとし、前記範囲
以降のストランド長さ方向の範囲の原料充填層の層厚方
向の差圧を２０００〜５０００ｍｍＡｑと増加して焼結
することがさらに好ましい。The pressure difference between the upper and lower portions of the oxygen-containing gas to be supplied to the raw material packed bed is such that the front (lowest) position of the combustion melting zone after the ignition of the surface layer of the raw material packed layer has a layer thickness of 30 below the surface layer.
% In the layer thickness direction within the range of the strand length direction within 500% to 2000 mmAq of the related art, and the differential pressure in the layer thickness direction of the raw material-filled layer in the range of the strand length direction after the above range is 2000 to 2000 mmAq. It is more preferable to increase the sintering temperature to 5000 mmAq.
【００２６】配合原料の粉コークス等の燃料配合率を増
加し、原料充填層の上方から下方のうち、表層から下方
に層厚３０％以内の範囲内を焼結する際の層厚方向の差
圧を従来の６００〜２０００ｍｍＡｑで焼結しても、原
料充填層上層部の高温保熱指数を従来よりは増加できる
ため、焼結鉱の成品歩留、品質を従来よりは向上するこ
とができる。ここで、原料充填層の層厚方向の差圧を従
来よりも増すと、原料充填層上層部の焼結鉱の成品歩
留、品質は従来と変わらないが、燃焼溶融帯の移行速度
を増し生産率を増加することが可能である。しかしなが
ら、前記のように焼結すると、通気抵抗の最も大きい燃
焼溶融帯の層厚方向の幅が増加し、原料充填層の通気抵
抗が増すため、燃焼溶融帯の移行速度が低下してしま
う。そこで、表層から下方に層厚３０％以内の範囲を除
く厚みの範囲の原料充填層を焼結させる際の層厚方向の
差圧だけを２０００〜５０００ｍｍＡｑと大きくして焼
結する。このようにしてガス流速を増加させれば、燃焼
溶融帯上方の冷却帯の移行速度もガス流速が増したこと
から増加し、通気抵抗の最も大きい燃焼溶融帯の層厚方
向の幅が減少する。従って、ガス流速を増加しても、焼
結ベッド全体での通気抵抗はほとんど現状に対し変化す
ることなく焼成することができる。The fuel blending ratio of the coke breeze powder and the like as the blending raw material is increased, and the difference in the thickness direction when sintering within 30% or less of the layer thickness from the top to the bottom of the raw material packed bed from the surface layer. Even when the pressure is sintered at 600 to 2000 mmAq, the high-temperature heat retention index of the upper layer of the raw material filling layer can be increased as compared with the conventional method, so that the product yield and quality of the sintered ore can be improved as compared with the conventional method. . Here, when the pressure difference in the thickness direction of the raw material packed layer is increased from the conventional level, the product yield and quality of the sintered ore in the upper layer of the raw material packed layer are not changed from the conventional, but the transfer speed of the combustion melting zone is increased. It is possible to increase the production rate. However, when the sintering is performed as described above, the width in the thickness direction of the combustion melting zone having the highest airflow resistance increases, and the airflow resistance of the material-filled layer increases, so that the transition speed of the combustion melting zone decreases. Therefore, only the differential pressure in the layer thickness direction when sintering the material-filled layer in the thickness range excluding the range of 30% or less below the surface layer is increased to 2000 to 5000 mmAq and sintered. If the gas flow velocity is increased in this manner, the transition velocity of the cooling zone above the combustion melting zone also increases due to the increased gas flow velocity, and the width in the layer thickness direction of the combustion melting zone having the highest ventilation resistance decreases. . Therefore, even if the gas flow rate is increased, the sintering can be performed with almost no change in the ventilation resistance of the entire sintering bed from the current state.
【００２７】ガス流速を増加した場合には、下方から吸
引したときの送風圧力と重力により原料充填層が圧縮さ
れて起きる通気阻害要因が考えられる。しかし、本発明
によれば粉コークス等の燃料配合率を増すことから最高
到達温度が高くなり、従来よりも高温となった排ガスが
燃焼溶融帯下方にある湿潤帯と乾燥帯を通過するので、
湿潤帯での水分凝縮量が減少し、乾燥帯の層厚方向の幅
が減少するので、該部位の通気抵抗が小さくなる。さら
に、前述したように焼結ベッド全体での通気抵抗はほと
んど現状に対し変化しない。When the gas flow rate is increased, it is considered that the raw material packed bed is compressed by the blast pressure and the gravity at the time of suction from below, and this is a factor that inhibits aeration. However, according to the present invention, the maximum attainable temperature is increased by increasing the fuel blending ratio of the coke breeze and the like, and the exhaust gas that has become higher than before passes through the wet zone and the dry zone below the combustion melting zone.
Since the amount of water condensed in the wet zone is reduced, and the width of the dry zone in the layer thickness direction is reduced, the airflow resistance at the site is reduced. Furthermore, as described above, the ventilation resistance of the entire sintered bed hardly changes from the current state.
【００２８】また、本発明では、配合原料中の燃料の燃
焼速度を増加させることができるので、焼結速度を増加
させ、焼結機のストランド長さを変えることなく充填層
の層厚を７００〜１５００ｍｍと従来の２倍以上とする
ことさえ可能である。Further, according to the present invention, since the burning rate of the fuel in the blended raw material can be increased, the sintering rate can be increased, and the thickness of the packed bed can be increased to 700 without changing the strand length of the sintering machine. It is even possible to make the thickness up to 1500 mm, which is twice or more the conventional value.
【００２９】[0029]
【発明の実施の形態】図１は本発明を実施する設備の概
要図で、焼結配合原料１はサージホッパー２からドラム
フィーダー３、原料装入装置５を介してパレット６上に
連続的に供給され、パレット６上に層状に積層される。
この間、原料給鉱側のスプロケット４を回転させてパレ
ット６を所定の速度で移動させると共に、パレット６の
上側にある加圧フード１４から加圧された空気を送風
し、下側に複数個設けたウインドボックス８、メインダ
クト９、排ガス集塵機１０を経て吸引ブロアー１１によ
り吸気し、煙突１２より排ガスを排出できるようになっ
ている。さらに、メインダクト９にはダンパー１７を設
け、排ガス集塵機１５を経て吸引ブロアー１６により吸
気できるようになっている。また、加圧フード１４は着
脱可能となっている。点火炉１３により原料充填層７の
上面に点火して、パレット６上の原料充填層７が排鉱部
に達する間に全層にわたって焼結反応を完了させるよう
に速度制御した連続運転を実施する。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of a facility for carrying out the present invention. A sintering compound material 1 is continuously supplied from a surge hopper 2 to a pallet 6 via a drum feeder 3 and a material charging device 5. It is supplied and laminated on the pallet 6 in layers.
During this time, the sprocket 4 on the raw material supply side is rotated to move the pallet 6 at a predetermined speed, and air pressurized from the pressurizing hood 14 above the pallet 6 is blown to provide a plurality of lower pallets. Air is sucked by a suction blower 11 through a wind box 8, a main duct 9, and an exhaust gas dust collector 10, and exhaust gas can be discharged from a chimney 12. Further, a damper 17 is provided in the main duct 9, and can be sucked by the suction blower 16 through the exhaust gas dust collector 15. The pressure hood 14 is detachable. The upper surface of the raw material filling layer 7 is ignited by the ignition furnace 13, and a continuous operation in which the sintering reaction is completed over all layers while the raw material filling layer 7 on the pallet 6 reaches the mining section is performed. .
【００３０】また、加圧フード１４の設置範囲は、スト
ランドの一部のみに設置するなど、限定されるものでは
ない。さらに、この加圧フード１４には、煙突１２の前
から送風ブロアーを介して低酸素濃度の高温な排ガスを
吹き込むことができるし、焼結工程以外から発生する酸
素濃度が１２〜２１％の低酸素濃度のガスを吹き込むこ
とや、酸素富化したガスを吹き込むことも可能である。The installation range of the pressurized hood 14 is not limited, for example, it is installed only on a part of the strand. Further, high-temperature exhaust gas having a low oxygen concentration can be blown into the pressurized hood 14 from the front of the chimney 12 through a blower blower. It is also possible to blow a gas having an oxygen concentration or blow a gas enriched with oxygen.
【００３１】[0031]
【実施例】本発明を実施例１〜３および比較例により詳
細に説明する。The present invention will be described in detail with reference to Examples 1 to 3 and Comparative Examples.
【００３２】焼結面積５００ｍ2 で焼結パレット幅５ｍ
の実機焼結機を図１に示すように一部改造して、１水準
７日間ずつの操業を行った。配合原料は種々の鉄鉱石お
よび石灰石、生石灰、蛇紋岩、スケール等の雑原料、返
鉱、粉コークスを焼結鉱中のＳｉＯ2 、Ａｌ2 Ｏ3 がそ
れぞれ５．８％、１．８％になるように調整し、塩基度
は１．７になるように配合した。返鉱配合率は新原料の
合計１００に対して１５％一定、コークス配合率は新原
料の合計１００に対してそれぞれ設定した。[0032] In the sintering area 500m 2 sintering pallet width 5m
The actual sintering machine was partially remodeled as shown in FIG. The raw materials are various raw materials such as iron ore and limestone, quicklime, serpentine, scales, etc., returned ore coke, and 5.8% and 1.8% of SiO 2 and Al 2 O 3 in sinter, respectively. Was adjusted so that the basicity was 1.7. The returned ore mixing ratio was set to 15% constant with respect to the total of 100 new raw materials, and the coke mixing ratio was set to 100 total of the new raw materials.
【００３３】配合原料に返鉱、粉コークスを配合した後
に水を添加してミキサーで混合、造粒して焼結機に装入
した。操業は、層厚を５５０ｍｍ一定とし、焼結完了点
が排鉱部になるようにパレットスピードを調整した。After mixing the returned ore and the coke breeze into the raw materials, water was added, mixed with a mixer, granulated, and charged into a sintering machine. In the operation, the pallet speed was adjusted so that the layer thickness was constant at 550 mm and the sintering completion point was located in the mined part.
【００３４】実施例１では、粉コークス配合率を６．０
％とし、点火炉は従来と同じ吸引負圧とし、点火炉を除
くストランドでは２８００ｍｍＡｑの吸引負圧で大気を
吸気した。In Example 1, the mixing ratio of coke breeze was 6.0.
%, The ignition furnace was at the same suction negative pressure as the conventional one, and the air was sucked into the strands other than the ignition furnace at a suction negative pressure of 2800 mmAq.
【００３５】実施例２では、粉コークス配合率を６．０
％とし、点火炉は従来と同じ吸引負圧とし、点火炉を除
くストランドでは原料充填層上方の加圧フードから１３
００ｍｍＡｑの圧力で送風し、下方から１５００ｍｍＡ
ｑの吸引負圧で吸気した。In Example 2, the mixing ratio of coke breeze was 6.0.
%, The suction pressure of the ignition furnace is the same as the conventional suction negative pressure.
Blow at a pressure of 00 mmAq, 1500 mmA from below
The air was suctioned at a suction negative pressure of q.
【００３６】実施例３では、粉コークス配合率を５％と
し、点火炉は従来と同じ吸引負圧とし、原料充填層の上
方から下方のうち、燃焼溶融帯の前線位置が表層から下
方に層厚１０％までのストランド長さ方向の範囲内の層
厚方向の差圧を１５００ｍｍＡｑとし、前記範囲以降の
ストランド長さ方向の範囲の原料充填層の上方に設けた
加圧フードから１３００ｍｍＡｑの圧力で送風し、下方
から１５００ｍｍＡｑの吸引負圧で吸気して、差圧を２
８００ｍｍＡｑとして焼結した。In Example 3, the mixing ratio of coke breeze was set to 5%, the ignition furnace was set to the same negative suction pressure as the conventional one, and the front position of the combustion melting zone was formed from above to below the raw material packed bed. The differential pressure in the layer thickness direction within the range of the strand length direction up to 10% is 1500 mmAq, and the pressure is 1300 mmAq from the pressurized hood provided above the raw material packed layer in the range of the strand length direction after the above range. The air was blown in from the bottom and suctioned from the bottom with a suction negative pressure of 1500 mmAq.
It was sintered at 800 mmAq.
【００３７】比較例は、粉コークス配合率を４．２％と
し、吸引負圧１５００ｍｍＡｑ一定で点火部から排鉱部
まで大気を吸引する従来法で焼結した。In the comparative example, the coke breeze mixing ratio was 4.2%, and sintering was performed by a conventional method in which the atmosphere was sucked from the ignition section to the mining section at a constant suction negative pressure of 1500 mmAq.
【００３８】表２に比較例と実施例１、２、３で得られ
た焼結鉱の生産率、成品歩留、ＲＤＩ、ＮＯｘ排出量原
単位を示す。Table 2 shows the production rates, product yields, RDI, and NOx emission basic units of the sintered ore obtained in the comparative example and Examples 1, 2, and 3.
【００３９】[0039]
【表２】 [Table 2]
【００４０】表２から分かるように、実施例１、２、３
では比較例に対して生産率が著しく向上した。また、従
来は生産率が向上すると成品歩留が低下する傾向があっ
たが、本発明では成品歩留も向上した。さらに、ＲＤＩ
とＮＯｘ排出量原単位も改善され、操業面および環境面
において優れた効果を発揮できた。As can be seen from Table 2, Examples 1, 2, and 3
The production rate was significantly improved compared to the comparative example. Further, conventionally, when the production rate is improved, the product yield tends to decrease, but in the present invention, the product yield is improved. In addition, RDI
In addition, the basic unit of NOx emission was improved, and excellent effects were obtained in operation and environment.
【００４１】なお、配合原料の装入密度、焼結時の差圧
の設定や吸引ガスの酸素濃度と吸引時間は上記実施例に
限るものではなく、生産性指向やＲＤＩ改善指向、ＮＯ
ｘ排出抑制指向、排ガス量抑制指向で変化させることが
できる。The setting of the charge density of the compounded raw material, the setting of the differential pressure during sintering, the oxygen concentration of the suction gas and the suction time are not limited to those in the above-described embodiment.
It can be changed in x emission suppression direction and exhaust gas amount suppression direction.
【００４２】[0042]
【発明の効果】本発明によれば、従来困難であったパレ
ット速度の大幅な増加が可能となり、焼結機の生産性を
大幅に向上させることができる。さらに、成品歩留やＲ
ＤＩが改善され、ＮＯｘ排出量原単位や排ガス量が低減
される。このように、本発明は両立し難い改善効果を同
時にもたらしており、その効果は非常に大きい。According to the present invention, the pallet speed, which has conventionally been difficult, can be greatly increased, and the productivity of the sintering machine can be greatly improved. Furthermore, product yield and R
The DI is improved, and the basic unit of NOx emission and the amount of exhaust gas are reduced. As described above, the present invention simultaneously provides an improvement effect that is incompatible with each other, and the effect is extremely large.
【図１】本発明を実施するための焼結装置の例を示す図
である。FIG. 1 is a diagram showing an example of a sintering apparatus for carrying out the present invention.
１ 焼結配合原料 ２ サージホッパー ３ ドラムフィーダー ４ スプロケット ５ 原料装入装置 ６ パレット ７ 原料充填層 ８ ウインドボックス ９ メインダクト １０ 排ガス集塵機 １１ 吸引ブロアー １２ 煙突 １３ 点火炉 １４ 加圧フード １５ 排ガス集塵機 １６ 吸引ブロアー １７ ダンパー DESCRIPTION OF SYMBOLS 1 Sintering compound raw material 2 Surge hopper 3 Drum feeder 4 Sprocket 5 Raw material charging device 6 Pallet 7 Raw material filling layer 8 Wind box 9 Main duct 10 Exhaust gas dust collector 11 Suction blower 12 Chimney 13 Ignition furnace 14 Pressurized hood 15 Exhaust gas dust collector 16 Suction Blower 17 damper
Claims (3)
料をドワイトロイド式焼結機のパレット上に装入して原
料充填層表層部に点火し、原料充填層上方から下方へ酸
素含有ガスを供給して焼結鉱を製造する方法において、
原料粉鉱石と溶剤の合計に対して燃料を５．０〜８．０
ｗｔ％とし、原料充填層の層厚方向の差圧を２０００〜
５０００ｍｍＡｑとして焼結することを特徴とする焼結
鉱製造方法。1. A blended raw material containing a raw material powder ore, a solvent and a fuel is loaded on a pallet of a Dwyroid type sintering machine, ignited on a surface layer of the raw material packed bed, and contains oxygen from above the raw material packed bed to below. In a method for producing a sintered ore by supplying a gas,
The fuel is 5.0 to 8.0 based on the sum of the raw powder ore and the solvent.
wt%, and the differential pressure in the thickness direction of the raw material packed layer is set to 2000 to 2000%.
A sinter production method characterized by sintering at 5000 mmAq.
含有ガスを加圧供給する加圧フードを設け、該加圧フー
ド内を大気圧に対して１００〜４９９９ｍｍＡｑに加圧
するとともに、原料充填層の下方から大気圧に対して−
４９００〜−１ｍｍＡｑで吸引することを特徴とする請
求項１記載の焼結鉱製造方法。2. A pressurized hood for pressurizing and supplying an oxygen-containing gas is provided on a raw material packed bed on a sintering pallet, and the inside of the pressurized hood is pressurized to 100 to 4999 mmAq with respect to the atmospheric pressure. From below the packed bed to atmospheric pressure-
The sinter production method according to claim 1, wherein the suction is performed at 4900 to -1 mmAq.
の前線の位置が表層から下方に層厚３０％以内であるス
トランド長さ方向の範囲内の層厚方向の差圧を５００〜
２０００ｍｍＡｑとし、前記範囲以降のストランド長さ
方向の範囲の原料充填層の層厚方向の差圧を２０００〜
５０００ｍｍＡｑとして焼結することを特徴とする請求
項１または請求項２記載の焼結鉱製造方法。3. After igniting the surface portion of the material-filled layer, the pressure difference in the layer thickness direction within the range of the strand length direction in which the position of the front of the combustion zone melting is within 30% of the layer thickness below the surface layer is 500 to 3.
2000 mmAq, the pressure difference in the thickness direction of the raw material packed layer in the range of the strand length direction after the above range is 2000 to 2000
The sintering method according to claim 1, wherein the sintering is performed at 5000 mmAq.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2785598A JPH11209827A (en) | 1998-01-27 | 1998-01-27 | Production of sintered ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2785598A JPH11209827A (en) | 1998-01-27 | 1998-01-27 | Production of sintered ore |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11209827A true JPH11209827A (en) | 1999-08-03 |
Family
ID=12232540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2785598A Withdrawn JPH11209827A (en) | 1998-01-27 | 1998-01-27 | Production of sintered ore |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11209827A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020042893A (en) * | 2000-12-01 | 2002-06-08 | 이구택 | A sintering machine |
| US10384296B2 (en) | 2014-12-15 | 2019-08-20 | Arconic Inc. | Resistance welding fastener, apparatus and methods for joining similar and dissimilar materials |
| US10593034B2 (en) | 2016-03-25 | 2020-03-17 | Arconic Inc. | Resistance welding fasteners, apparatus and methods for joining dissimilar materials and assessing joints made thereby |
| US10903587B2 (en) | 2014-02-03 | 2021-01-26 | Howmet Aerospace Inc. | Resistance welding fastener, apparatus and methods |
-
1998
- 1998-01-27 JP JP2785598A patent/JPH11209827A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020042893A (en) * | 2000-12-01 | 2002-06-08 | 이구택 | A sintering machine |
| US10903587B2 (en) | 2014-02-03 | 2021-01-26 | Howmet Aerospace Inc. | Resistance welding fastener, apparatus and methods |
| US10384296B2 (en) | 2014-12-15 | 2019-08-20 | Arconic Inc. | Resistance welding fastener, apparatus and methods for joining similar and dissimilar materials |
| US10593034B2 (en) | 2016-03-25 | 2020-03-17 | Arconic Inc. | Resistance welding fasteners, apparatus and methods for joining dissimilar materials and assessing joints made thereby |
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