JP3706468B2

JP3706468B2 - Method and apparatus for charging sintered raw material

Info

Publication number: JP3706468B2
Application number: JP25748697A
Authority: JP
Inventors: 徹三芳我; 俊次笠間; 大介柴田; 泰生左藤
Original assignee: Nippon Steel Corp
Current assignee: Nippon Steel Corp
Priority date: 1997-09-05
Filing date: 1997-09-05
Publication date: 2005-10-12
Anticipated expiration: 2017-09-05
Also published as: JPH1180848A

Description

【０００１】
【発明の属する技術分野】
本発明は、焼結原料中の偏析を乱さずに焼結パレット上へ装入する方法に関するものである。
【０００２】
【従来の技術】
ＤＬ型焼結機においては、無端鎖状の焼結パレットに原料装入装置によって焼結原料を装入し、この装入原料層の表面に点火炉で着火すると共にウインドボックスを介して排風機によって焼結原料層の上方部の空気を吸引することにより、焼結パレットの移動に伴い焼結原料中に配合されたコークスが燃焼し、順次、焼結原料の焼結がおこなわれ、排鉱部で焼結パレットより落下し、排出される。
原料装入装置にて焼結パレット上に焼結原料を装入するに際して、上層部は、保熱効果が少なく、急冷等により脆弱な焼結鉱となるため、下層部に比し燃料分（コークス）を多く、かつ粒度が小さくなるように偏析装入することが焼結鉱の品質及び生産性を向上させるのに効果的であることは周知である。
従来より、図４に示すように、焼結パレット５への原料装入装置６は、上下に対面する２枚のシュート３_U、３_Lを間隔を設けて設置し、上側シュート３_Uの焼結原料落下位置１２の下方に原料滑降方向と直角方向に開口部を設け、この開口部に複数のバー１１を設け、更に、下側シュート３_Lの下端にカットゲート４を設けて構成し、これにより焼結原料８中の粗粒原料１６は上側シュート３_Uのスリット状開口９から落下せずに上側シュート３_U上を滑降して焼結パレット５上に装入される。一方、前記燃料分を多く含んだ微細粒原料１５は上側シュート３_Uのスリット状開口９より落下し下側シュート３_Lで受けられ、下側シュート３_L上を滑降して、焼結パレット５上の粗粒原料１６の表層上に装入される。その後にカットゲート４にて焼結原料が均される。なお、符号１は給鉱ホッパーを、１ａはホッパーゲートを、２はフィーダーを表している。
【０００３】
【表１】

【０００４】
この装入される焼結原料８は、表１に示すように１ｍｍ以下の微粉を含んでおり、原料中水分は６〜８％であるため図５（ａ）、（ｂ）に示すように上側シュート３_Uあるいは下側シュート３_Lの表面へ付着し易く、この付着原料Ｈにより焼結原料８の流れが乱されるために焼結パレット５の巾方向において不均一な装入となり、装入後の焼結パレット５の巾方向の原料表面に２０〜５０ｍｍの凹凸が生じる。この焼結パレット５の巾方向の原料表面に生じた凹凸を無くすようにカットゲート４にて原料を均すと、微細粒原料１５はむろん粗粒原料１６の凹凸までもカットゲート４で掻き取ってしまうため、均した後の原料層の表面に粗粒原料１６が露出する部分が生じ、折角、層高方向につけられた粒度偏析状態が乱され、偏析装入効果が薄れ、焼結鉱の歩留、強度向上を図ることの障害となる問題があった。
【０００５】
【発明が解決しようとする課題】
本発明は、ホッパーから焼結原料をシュートを介して焼結パレット上へ装入するに際して、カットゲートによる焼結パレット上の微細粒原料の偏析乱れをなくすことにより焼結鉱の歩留、強度を向上させる方法を提供するものである。
【０００６】
【課題を解決するための手段】
本発明は、上記課題を解決するためになされたものであり、その手段１は、ホッパーからフィーダーを介して落下供給される焼結原料をシュートを介して焼結パレット上へ装入するに際し、前記焼結原料を粗粒と微細粒に分離し、この分離した粗粒原料を前記焼結パレット上に装入し、その表層上に微細粒原料を装入する方法において、前記焼結パレット上に装入した前記粗粒原料の表層を均し、その表層上に前記微細粒原料を装入する方法である。
その手段２は、手段１の方法において、更に、前記シュートに開口を設け、この開口の上方から該シュート上を滑降する前記焼結原料に向かって気体を吹き付けて、前記微細粒原料を前記開口より落下させて前記粗粒原料と前記微細粒原料に分離し、この分離した粗粒原料を前記焼結パレット上に装入し、その表層上に前記微細粒原料を装入する方法である。
その手段３は、手段１の方法において、更に、前記シュートを所定間隔を有して上下に対面して設けた上側シュート及び下側シュートとし、この上側シュートへ前記フィーダーから落下供給される前記焼結原料の落下位置下方に開口を設け、この開口の上方から該上側シュート上を滑降する前記焼結原料に向かって気体を吹き付けて、前記微細粒原料を前記開口より落下させて前記粗粒原料と前記微細粒原料に分離し、この分離した粗粒原料を前記焼結パレット上に装入し、前記落下分離した微細粒原料を前記下側シュートで受け、この微細粒原料が下側シュートの下端より落下する際に、気体を吹き付けて、細粒原料と微粒原料に分離して、前記焼結パレット上に装入した前記粗粒原料の表層上に前記細粒原料、前記微粒原料の順に積層装入する方法である。
更に、手段４は、ホッパーからフィーダーを介して落下供給される焼結原料をシュートを介して焼結パレット上へ装入するに際し、前記焼結原料を粗粒と微細粒に分離し、この分離した粗粒原料を前記焼結パレット上に装入し、その表層上に微細粒原料を装入する装置において、前記シュートに前記フィーダーから落下供給される前記焼結原料の落下位置下方に開口を設け、この開口の上方に前記シュート上を滑降する前記焼結原料に向かって気体を吹き付けるノズルを設け、前記シュートの下部に前記焼結パレット上に装入した前記粗粒原料の表層を均すカットゲートを設けた装入装置である。
手段５は、手段４の方法において、更に、前記シュートを所定間隔を有して上下に対面して設けた上側シュート及び下側シュートとし、前記上側シュートの開口の上方に設けた前記ノズルにより吹き付けた気体で分離した前記微細粒原料を前記下側シュートで受けて滑降させ、この下側シュートの下端より落下する前記微細粒原料に気体を吹き付けて細粒原料と微粒原料に分離して、前記焼結パレット上に装入した前記粗粒原料の表層上に前記細粒原料、前記微粒原料の順に積層装入するノズルを前記上側シュート下部に設け、前記上側シュートより前記焼結パレット上に装入した前記粗粒原料の表層を均す前記カットゲートを前記上側シュートの下部に設けた装入装置である。
【０００７】
焼結原料を２段に焼結パレット上に偏析装入する場合においては、図４に示すように焼結パレット５上の装入原料層７の層厚は４９０〜６５０ｍｍ程度であり、その内微細粒原料層７_Uの層厚は１０〜５０ｍｍ程度で、残りの４８０〜６００ｍｍ程度が粗粒原料層７_Lの層厚である。
従って、全層厚に対する微細粒原料層厚の比率は、２〜８％であり残りの９８〜９２％が粗粒原料層厚の比率であり圧倒的に粗粒原料層厚の比率が高い、このため装入後の原料表面の凹凸の大部分は粗粒原料１６により生じたものである点に着目し、この粗粒原料１６の表面の凹凸を均し、その均した表層上に微細粒原料１５を装入することにより、ほぼ原料層全体の表面凹凸を消すことが可能となり、焼結パレット５上の微細粒原料１５の偏析乱れが大幅に低下した。勿論、微細粒原料１５をカットしていないため、微細粒原料１５由来の原料表面の凹凸は残るが、前記した様に、全層に対する微細粒原料層厚の比率は２〜８％と極めて小さいため装入後の原料表面の凹凸は１〜４ｍｍと実操業上問題になるものではなかった。
【０００８】
また、本発明の効果を発揮させるための焼結原料の装入手段として、前記したスリット状開口を設けたシュートを用いる手段の他に、開口を有するシュートにおいて開口の上方からシュートを滑降する原料に向かって気体を吹き付ける手段や、この気体を吹き付けて分離した微細粒にさらに気体を吹き付けて細粒と微粒に分級する手段も有効である。
【０００９】
【発明の実施の形態】
次に本発明の実施の形態について説明する。
＜第１の実施の形態＞
第１の実施の形態を、図１にて説明する。図１は、フィーダー２の下方に上下に対面するように上側シュート３_U（巾：５０００ｍｍ）と下側シュート３_L（巾：５０００ｍｍ）を１５０〜３００ｍｍの間隔を有して設け、フィーダー２から落下供給される焼結原料８の上側シュート３_U上の落下位置１２の下方に原料滑降方向と直角方向に開口部を設け、この開口部内に所定間隔に複数のバー１１を設けてスリット状開口９（スリット状開口一個のサイズ＝巾：５０００ｍｍ、長：５〜２０ｍｍ）を形成し、更に、上側シュート３_Uの下端に上下動可能にカットゲート４を設けた焼結原料８の装入装置である。
ホッパーの一例である給鉱ホッパー１内の表１に示す粒度分布を有する焼結原料８をフィーダー２より切り出し、上側シュート３_Uへ供給する。粗粒原料１６（２ｍｍ以上）は、スリット状開口９より落下せずに上側シュート３_U上を滑降して焼結パレット５上へ層（粗粒原料層７_L）厚４８０〜６００ｍｍ程度に装入される。装入された粗粒原料１６の表層部はカットゲート４にて均される。一方、微細粒原料１５（２ｍｍ未満）はスリット状開口９を通過し、下側シュート３_Lにて受けられて、下側シュート３_L上を滑降して焼結パレット５上の粗粒原料１６の表層上へ層（微細粒原料層７_U）厚１０〜５０ｍｍ程度に装入される。その結果、焼結パレット５上の原料層（装入原料層７）の全層厚は４９０〜６５０ｍｍ程度となる。このように粗粒原料１６を装入した後、直ちに均しているので、微細粒原料１５は、粗粒原料１６の表層上に装入された積層状態をカットゲート４により乱されることは無く、装入装置によって付けられた偏析を維持している。
【００１０】
＜第２の実施の形態＞
第２の実施の形態を、図２にて説明する。図２は、フィーダー２の下方にシュート３（巾：５０００ｍｍ）を設け、フィーダー２から落下供給される焼結原料８のシュート３上の落下位置１２の下方に開口１０（開口サイズ＝巾：５０００ｍｍ、長：５０〜３００ｍｍ）を設け、シュート３上を滑降する焼結原料８に向かって気体を吹き付けるノズル１３（風量：５０〜３００ｍ³／分）を開口１０の上方に設け、シュート３の下端に上下動可能にカットゲート４を設けた焼結原料８の装入装置である。
給鉱ホッパー１内の表１に示す粒度分布を有する焼結原料８をフィーダー２より切り出し、シュート３へ供給する。粗粒原料１６（２ｍｍ以上）は、開口１０より落下せずにシュート３上を滑降して焼結パレット５へ層（粗粒原料層７_L）厚４８０〜６００ｍｍ程度に装入される。その後、粗粒原料１６はカットゲート４にて均される。一方、微細粒原料１５（２ｍｍ未満）は開口１０より落下して、焼結パレット５上の粗粒原料１６の表層上へ層（微細粒原料層７_U）厚１０〜５０ｍｍ程度に装入される。その結果、原料層（装入原料層７）の全層厚は４９０〜６５０ｍｍ程度となる。このように粗粒原料１６を装入した後、直ちに均しているので、微細粒原料１５は、粗粒原料１６の表層上に装入された積層状態をカットゲート４により乱されることは無く、装入装置によって付けられた偏析を維持している。
【００１１】
＜第３の実施の形態＞
第３の実施の形態を、図３にて説明する。図３は、フィーダー２の下方に上下に対面するように上側シュート３_U（巾：５０００ｍｍ）と下側シュート３_L（巾：５０００ｍｍ）を１５０〜３００ｍｍの間隔を有して設け、フィーダー２から落下供給される焼結原料８の上側シュート３_U上の落下位置１２の下方に開口１０（開口サイズ＝巾：５０００ｍｍ、長：５０〜３００ｍｍ）を設け、上側シュート３_U上を滑降する焼結原料８に向かって気体を吹き付ける上部ノズル１３_U（風量：５０〜３００ｍ³／分）を開口１０の上方に設け、開口１０より落下し、下側シュート３_Lにて受けられ、下側シュート３_Lの下端より落下する微細粒原料１５に気体を吹き付ける下部ノズル１３_L（風量：２０〜２００ｍ³／分）を上側シュート３_U下部に設け、上側シュート３_Uの下端に上下動可能にカットゲート４を設けた焼結原料８の装入装置である。
給鉱ホッパー１内の表１に示す粒度分布を有する焼結原料８をフィーダー２より切り出し、上側シュート３_Uへ供給する。粗粒原料１６（２ｍｍ以上）は、開口１０より落下せずに上側シュート３_U上を滑降して焼結パレット５へ層（粗粒原料層７_L）厚４８０〜６００ｍｍ程度に装入される。その後、粗粒原料１６はカットゲート４にて均される。一方、微細粒原料１５は開口１０より落下して、下側シュート３_Lにて受けられ、下側シュート３_Lの下端より落下する際に気体を吹き付ける下部ノズル１３_Lにて細粒（２ｍｍ未満１ｍｍ以上）と微粒（１ｍｍ未満）に分級されて焼結パレット５上の粗粒原料１６の表層上へ細粒、微粒の順に層（微細粒原料層７_U）厚１０〜５０ｍｍ程度に装入される。その結果、原料層（装入原料層７）の全層厚は４９０〜６５０ｍｍ程度となる。このように粗粒原料１６を装入した後、直ちに均しているので、細粒原料１５ａ及び微粒原料１４は、粗粒原料１６の表層上に装入された積層状態をカットゲート４により乱されることは無く、装入装置によって付けられた偏析を維持している。なお、図１、図２、及び図３において１ａはホッパーゲートを示す。
【００１２】
【実施例】
次に、上記第１〜第３の実施の形態と従来法における焼結パレット上の装入原料の上層５０ｍｍの焼結原料をサンプリングし、その粒度分布を測定したものを表２に示す。これから第１〜第３の実施の形態は従来法に比較して焼結パレット上装入原料上層部の焼結原料粒度分布が細かくなっている。この結果、表３に示すように、第１〜第３の実施の形態は従来法に比較して焼結歩留と焼結鉱の強度共に向上している。
【００１３】
【表２】

【００１４】
【表３】

【００１５】
【発明の効果】
以上説明したように本発明は焼結パレット上へ装入した粗粒原料の表層部を均した後に微細粒原料を装入することにより、微細粒原料と粗粒原料の混合がなくなり、微細粒偏析乱れが大幅に低下し、焼結鉱の強度、歩留の向上が可能となり、この分野における効果は大きい。
【図面の簡単な説明】
【図１】本発明の第１の実施の形態の説明図である。
【図２】本発明の第２の実施の形態の説明図である。
【図３】本発明の第３の実施の形態の説明図である。
【図４】従来技術の説明図である。
【図５】原料表面の凹凸の説明図である。
【符号の説明】
１給鉱ホッパー１a ホッパーゲート
２フィーダー３シュート
３_U 上側シュート３_L 下側シュート
４カットゲート５焼結パレット
６原料装入装置７装入原料層
７_U 微細粒原料層７_L 粗粒原料層
８焼結原料９スリット状開口
１０開口１１バー
１２落下位置１３ノズル
１３_U 上部ノズル１３_L 下部ノズル
１４微粒原料１５微細粒原料
１５ａ細粒原料１６粗粒原料[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of charging a sintered pallet without disturbing segregation in a sintered raw material.
[0002]
[Prior art]
In the DL type sintering machine, a sintering raw material is charged into an endless chain-shaped sintering pallet by a raw material charging device, and the surface of the charging raw material layer is ignited by an ignition furnace and a wind exhauster is passed through a wind box. By sucking the air in the upper part of the sintering raw material layer, the coke blended in the sintering raw material is combusted with the movement of the sintering pallet, and the sintering raw material is sequentially sintered and discharged. It falls from the sintering pallet and is discharged.
When charging the sintering raw material onto the sintering pallet with the raw material charging device, the upper layer part has less heat retention effect and becomes a fragile sintered ore by rapid cooling or the like. It is well known that segregation and charging so as to increase the amount of coke and reduce the particle size is effective in improving the quality and productivity of sintered ore.
Conventionally, as shown in FIG. 4, the raw material charging apparatus 6 to the sintering pallet 5 is installed with two

chutes

3 _U and 3 _L facing each other at an interval to burn the upper chute 3 _U. forming material drop position 12 downward an opening is provided in the raw material downhill direction perpendicular to the direction of the opening is provided a plurality of bars 11, the further configured by providing a cut gate 4 to the lower chute 3 _L lower end of, Thus coarse material 16 in the sintered material 8 is charged by downhill on upper chute 3 _U without falling from the slit-shaped opening 9 of the upper chute 3 _U on sintering pallet 5. Meanwhile, the fine particle raw material 15 containing a large amount of fuel distribution is received by the lower chute 3 _L dropped from a slit-shaped opening 9 of the upper chute 3 _U, and downhill the lower chute 3 above _L, sintering pallet 5 It is charged on the surface layer of the above coarse raw material 16. Thereafter, the sintered raw material is leveled by the cut gate 4. Reference numeral 1 represents a feed hopper, 1a represents a hopper gate, and 2 represents a feeder.
[0003]
[Table 1]

[0004]
As shown in Table 1, the sintered raw material 8 to be charged contains fine powder of 1 mm or less, and the water content in the raw material is 6 to 8%, so as shown in FIGS. 5 (a) and 5 (b). Since it tends to adhere to the surface of the upper chute 3 _U or the lower chute 3 _L and the flow of the sintering raw material 8 is disturbed by this adhering raw material H, the charging becomes uneven in the width direction of the sintering pallet 5. Unevenness of 20 to 50 mm occurs on the raw material surface in the width direction of the sintered pallet 5 after entering. When the raw material is leveled by the cut gate 4 so as to eliminate the unevenness generated on the surface of the raw material in the width direction of the sintered pallet 5, the fine grain raw material 15 is scraped by the cut gate 4 even of the unevenness of the coarse raw material 16. As a result, a portion where the coarse raw material 16 is exposed on the surface of the raw material layer after leveling is generated, the segregation state of the particle size segregated in the folding direction and the layer height direction is disturbed, and the segregation charging effect is reduced. There was a problem that hindered improvement in yield and strength.
[0005]
[Problems to be solved by the invention]
The present invention eliminates the segregation disorder of the fine grain material on the sintered pallet by the cut gate when charging the sintered material from the hopper onto the sintered pallet via the chute. It provides a method for improving the above.
[0006]
[Means for Solving the Problems]
The present invention has been made in order to solve the above problems, and the means 1 is used when charging a sintered raw material dropped from a hopper through a feeder onto a sintering pallet through a chute. In the method of separating the sintered raw material into coarse particles and fine particles, charging the separated coarse raw material onto the sintering pallet, and charging the fine particle raw material onto the surface layer, on the sintering pallet In which the surface layer of the coarse-grained raw material is leveled and the fine-grained raw material is charged on the surface layer.
In the method of means 1, the means 2 is further provided with an opening in the chute, and a gas is blown from above the opening toward the sintered raw material that slides down on the chute so that the fine grain raw material is opened in the opening. In this method, the raw material is further dropped and separated into the coarse particle material and the fine particle material, the separated coarse material is charged onto the sintered pallet, and the fine particle material is charged onto the surface layer.
In the method of means 1, the means 3 further comprises an upper chute and a lower chute that are provided facing the upper and lower sides with a predetermined interval, and the firing that is supplied to the upper chute by dropping from the feeder. An opening is provided below the falling position of the raw material, and a gas is blown from above the opening toward the sintered raw material that slides down on the upper chute to cause the fine-grained material to fall from the opening and the coarse-grained raw material. And separating the coarse raw material into the sintered pallet, receiving the fall separated fine granular raw material with the lower chute, and the fine granular raw material of the lower chute When falling from the lower end, gas is blown to separate the fine raw material and the fine raw material, and on the surface of the coarse raw material charged on the sintering pallet, the fine raw material and the fine raw material in this order. Laminated It is a method of.
Furthermore, the means 4 separates the sintered raw material into coarse particles and fine particles when charging the sintered raw material dropped from the hopper via the feeder onto the sintering pallet via the chute. In the apparatus for charging the coarse raw material thus prepared onto the sintering pallet and charging the fine granular raw material onto its surface layer, an opening is provided below the dropping position of the sintered raw material that is dropped and supplied from the feeder to the chute. A nozzle that blows gas toward the sintered raw material that slides down on the chute is provided above the opening, and the surface layer of the coarse raw material charged on the sintered pallet is leveled below the chute A charging device provided with a cut gate.
The means 5 further comprises an upper chute and a lower chute that are provided facing each other vertically with a predetermined interval in the method of the means 4, and sprayed by the nozzle provided above the opening of the upper chute. The fine grain material separated by the gas is received and slid down by the lower chute, and the fine grain raw material falling from the lower end of the lower chute is blown to separate the fine grain raw material and the fine grain raw material, A nozzle for laminating and charging the fine raw material and the fine raw material in that order on the surface of the coarse raw material charged on the sintering pallet is provided at the lower part of the upper chute, and is mounted on the sintering pallet from the upper chute. It is a charging device in which the cut gate for leveling the surface layer of the coarse raw material that has entered is provided below the upper chute.
[0007]
In the case where the sintering raw material is segregated and charged on the sintering pallet in two stages, the thickness of the charging raw material layer 7 on the sintering pallet 5 is about 490 to 650 mm as shown in FIG. The layer thickness of the fine grain material layer 7 _U is about 10 to 50 mm, and the remaining thickness of about 480 to 600 mm is the thickness of the coarse grain material layer 7 _L.
Therefore, the ratio of the fine grain material layer thickness to the total layer thickness is 2 to 8%, the remaining 98 to 92% is the ratio of the coarse grain material layer thickness, and the ratio of the coarse grain material layer thickness is overwhelmingly high. For this reason, paying attention to the fact that most of the irregularities on the raw material surface after charging are caused by the coarse raw material 16, the irregularities on the surface of the coarse raw material 16 are leveled, and fine particles are formed on the leveled surface layer. By introducing the raw material 15, it was possible to eliminate the surface irregularities of the entire raw material layer, and the segregation disorder of the fine-grain raw material 15 on the sintered pallet 5 was greatly reduced. Of course, since the fine-grain raw material 15 is not cut, the surface roughness of the raw material derived from the fine-grain raw material 15 remains, but as described above, the ratio of the fine-grain raw material layer thickness to the entire layer is as extremely small as 2 to 8%. Therefore, the unevenness of the raw material surface after charging was 1 to 4 mm, which was not a problem in actual operation.
[0008]
In addition to the means using the chute provided with the slit-shaped opening as a charging means for the sintering raw material for exerting the effects of the present invention, the raw material for sliding down the chute from above the opening in the chute having the opening Means for blowing a gas toward the surface and means for further blowing a gas to fine particles separated by blowing this gas to classify them into fine particles and fine particles are also effective.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
<First Embodiment>
A first embodiment will be described with reference to FIG. In FIG. 1, an upper chute 3 _U (width: 5000 mm) and a lower chute 3 _L (width: 5000 mm) are provided at intervals of 150 to 300 mm so as to face vertically below the feeder 2. an opening in the feed downhill direction perpendicular to the direction below the upper chute 3 drop position 12 on the _U of the sintering raw material 8 to be dropped and supplied provided, a slit-shaped opening a plurality of bars 11 at predetermined intervals in the opening portion provided 9 (the size of one slit-shaped opening = width: 5000 mm, length: 5-20 mm), and further, a charging device for the sintering raw material 8 provided with a cut gate 4 that can be moved up and down at the lower end of the upper chute 3 _U It is.
The sintering material 8 having a particle size distribution shown in Table 1 Kyuko hopper 1 which is an example of the hopper cut out from the feeder 2, and supplies to the upper chute 3 _U. The coarse raw material 16 (2 mm or more) does not fall from the slit-shaped opening 9 and slides down on the upper chute 3 _{U and} onto the sintering pallet 5 (coarse raw material layer 7 _L ) having a thickness of about 480 to 600 mm. Entered. The surface layer portion of the charged coarse raw material 16 is leveled by the cut gate 4. On the other hand, the fine particle raw material 15 (less than 2 mm) is passed through the slit-shaped opening 9, the lower chute 3 is received by _L, coarse material 16 on the sintering pallets 5 and downhill the lower chute 3 above _L The layer (fine-grain raw material layer 7 _U ) is charged to a thickness of about 10 to 50 mm. As a result, the total thickness of the raw material layer (charge raw material layer 7) on the sintered pallet 5 is about 490 to 650 mm. Since the raw material 16 is leveled immediately after the coarse raw material 16 is charged in this way, the fine particle raw material 15 is disturbed by the cut gate 4 in the laminated state charged on the surface layer of the coarse raw material 16. No segregation attached by the charging device.
[0010]
<Second Embodiment>
A second embodiment will be described with reference to FIG. In FIG. 2, a chute 3 (width: 5000 mm) is provided below the feeder 2, and an opening 10 (opening size = width: 5000 mm) below the dropping position 12 on the chute 3 of the sintered raw material 8 that is dropped and fed from the feeder 2. , Length: 50 to 300 mm), and a nozzle 13 (air volume: 50 to 300 m ³ / min) for blowing gas toward the sintering raw material 8 sliding down on the chute 3 is provided above the opening 10, and the lower end of the chute 3 Is a charging device for the sintering raw material 8 provided with a cut gate 4 that can be moved up and down.
A sintered raw material 8 having a particle size distribution shown in Table 1 in the feed hopper 1 is cut out from the feeder 2 and supplied to the chute 3. The coarse raw material 16 (2 mm or more) does not fall from the opening 10 but slides down on the chute 3 and is charged into the sintered pallet 5 with a layer (coarse raw material layer 7 _L ) thickness of about 480 to 600 mm. Thereafter, the coarse raw material 16 is leveled by the cut gate 4. On the other hand, the fine grain raw material 15 (less than 2 mm) falls from the opening 10 and is loaded onto the surface layer of the coarse grain raw material 16 on the sintering pallet 5 to a thickness of about 10 to 50 mm (fine grain raw material layer 7 _U ). The As a result, the total thickness of the raw material layer (charging raw material layer 7) is about 490 to 650 mm. Since the raw material 16 is leveled immediately after the coarse raw material 16 is charged in this way, the fine particle raw material 15 is disturbed by the cut gate 4 in the laminated state charged on the surface layer of the coarse raw material 16. No segregation attached by the charging device.
[0011]
<Third Embodiment>
A third embodiment will be described with reference to FIG. In FIG. 3, an upper chute 3 _U (width: 5000 mm) and a lower chute 3 _L (width: 5000 mm) are provided at intervals of 150 to 300 mm so as to face vertically below the feeder 2. Sintering is performed by sliding down on the upper chute 3 _U by providing an opening 10 (opening size = width: 5000 mm, length: 50 to 300 mm) below the dropping position 12 on the upper chute 3 _U of the sintered raw material 8 to be supplied by dropping. An upper nozzle 13 _U (air volume: 50 to 300 m ³ / min) for blowing gas toward the raw material 8 is provided above the opening 10, falls from the opening 10, is received by the lower chute 3 _L , and the lower chute 3 bottom nozzle 13 for blowing gas into the fine particle raw material 15 falling from the lower end of the _L _L (air volume: 20 to 200 m ³ / min) is provided on the upper chute 3 _U bottom, vertical movement to the lower end of the upper chute 3 _U A charging device of the sintering raw material 8 in which a cut gate 4 in ability.
The sintering material 8 cut out from the feeder 2 having a particle size distribution shown in Table 1 Kyuko hopper 1, supplied to the upper chute 3 _U. The coarse raw material 16 (2 mm or more) does not fall from the opening 10 but slides down on the upper chute 3 _U and is charged into the sintered pallet 5 with a layer (coarse raw material layer 7 _L ) thickness of about 480 to 600 mm. . Thereafter, the coarse raw material 16 is leveled by the cut gate 4. On the other hand, the fine-grain raw material 15 falls from the opening 10 and is received by the lower chute 3 _L , and is finely granulated (less than 2 mm) by the lower nozzle 13 _L that blows gas when dropping from the lower end of the lower chute 3 _L. 1 mm or more) and fine particles (less than 1 mm), and are loaded onto the surface of the coarse raw material 16 on the sintering pallet 5 in the order of fine particles and fine particles (fine raw material layer 7 _U ) in a thickness of about 10 to 50 mm. Is done. As a result, the total thickness of the raw material layer (charging raw material layer 7) is about 490 to 650 mm. Since the coarse raw material 16 is leveled immediately after the raw material 16 is charged in this way, the fine raw material 15 a and the fine raw material 14 disturb the stacked state of the raw material 16 charged on the surface layer by the cut gate 4. The segregation attached by the charging device is maintained. In FIGS. 1, 2 and 3, reference numeral 1a denotes a hopper gate.
[0012]
【Example】
Next, Table 2 shows the results of sampling the sintering material of the upper layer 50 mm of the charging material on the sintering pallet in the first to third embodiments and the conventional method, and measuring the particle size distribution. Thus, in the first to third embodiments, the sintered raw material particle size distribution in the upper layer portion of the raw material charged on the sintering pallet is finer than that in the conventional method. As a result, as shown in Table 3, in the first to third embodiments, both the sintering yield and the strength of the sintered ore are improved as compared with the conventional method.
[0013]
[Table 2]

[0014]
[Table 3]

[0015]
【The invention's effect】
As described above, the present invention eliminates the mixing of the fine-grain raw material and the coarse-grained raw material by mixing the fine-grain raw material after leveling the surface layer portion of the coarse-grained raw material charged onto the sintering pallet. The segregation turbulence is greatly reduced, and the strength and yield of the sintered ore can be improved, which has a great effect in this field.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a first embodiment of the present invention.
FIG. 2 is an explanatory diagram of a second embodiment of the present invention.
FIG. 3 is an explanatory diagram of a third embodiment of the present invention.
FIG. 4 is an explanatory diagram of the prior art.
FIG. 5 is an explanatory diagram of unevenness on the surface of a raw material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Feeding hopper 1a Hopper gate 2 Feeder 3 Chute 3 _U upper chute 3 _L lower chute 4 Cut gate 5 Sinter pallet 6 Raw material charging device 7 Charging raw material layer 7 _U fine grain raw material layer 7 _L coarse grain raw material layer 8 Sintering raw material 9 Slit-shaped opening 10 Opening 11 Bar 12 Falling position 13 Nozzle 13 _U upper nozzle 13 _L lower nozzle 14 Fine raw material 15 Fine granular raw material 15a Fine granular raw material 16 Coarse granular raw material

Claims

When charging the sintered raw material dropped from the hopper via the feeder onto the sintering pallet via the chute, the sintered raw material is separated into coarse particles and fine particles, and the separated coarse raw material is In the method of charging on the sintering pallet and charging the fine grain raw material on the surface layer,
A method for charging a sintered raw material, comprising leveling the surface layer of the coarse-grained raw material charged on the sintering pallet and charging the fine-grained raw material on the surface layer.

An opening is provided in the chute, and a gas is blown from above the opening toward the sintered raw material that slides down on the chute to drop the fine-grain raw material from the opening, thereby the coarse-grain raw material and the fine-grain raw material. 2. The method for charging a sintered material according to claim 1, further comprising: charging the separated coarse raw material onto the sintering pallet and charging the fine particle raw material onto a surface layer thereof. .

An upper chute and a lower chute provided facing the upper and lower sides with a predetermined interval are provided, and an opening is provided below the falling position of the sintering raw material supplied to the upper chute from the feeder. A gas is blown from above to the sintered raw material that slides down on the upper chute, and the fine-grain raw material is dropped from the opening to separate the coarse-grain raw material and the fine-grain raw material. The granular raw material is charged onto the sintered pallet, the finely divided raw material dropped and received by the lower chute, and when the fine granular raw material falls from the lower end of the lower chute, a gas is blown, 2. The fine raw material is separated into a fine raw material, and the fine raw material and the fine raw material are stacked in this order on the surface of the coarse raw material charged on the sintering pallet. Described Charging method of sintering raw materials.

When charging the sintered raw material dropped from the hopper via the feeder onto the sintering pallet via the chute, the sintered raw material is separated into coarse particles and fine particles, and the separated coarse raw material is In an apparatus that charges on a sintering pallet and charges fine grain raw material on the surface layer,
The chute is provided with an opening below the dropping position of the sintered raw material dropped from the feeder, and a nozzle that blows gas toward the sintered raw material sliding down on the chute is provided above the opening. A sintering raw material charging apparatus, comprising a cut gate for leveling a surface layer of the coarse raw material charged on the sintering pallet at a lower portion of the material.

The chute is an upper chute and a lower chute provided facing each other vertically with a predetermined interval, and the fine grain material separated by the gas blown by the nozzle provided above the opening of the upper chute is The coarse raw material charged on the sintered pallet, separated into fine raw material and fine raw material by blowing gas onto the fine raw material falling from the lower end of the lower chute, received by a side chute A nozzle for laminating and charging the fine raw material and the fine raw material in this order on the surface layer is provided at the lower part of the upper chute, and the surface layer of the coarse raw material charged on the sintered pallet from the upper chute is leveled. The apparatus for charging a sintering material according to claim 4, wherein a cut gate is provided at a lower portion of the upper chute.