JPH1150120A - Maintainance of rotary furnace hearth in production of reduced iron - Google Patents

Maintainance of rotary furnace hearth in production of reduced iron

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Publication number
JPH1150120A
JPH1150120A JP20558797A JP20558797A JPH1150120A JP H1150120 A JPH1150120 A JP H1150120A JP 20558797 A JP20558797 A JP 20558797A JP 20558797 A JP20558797 A JP 20558797A JP H1150120 A JPH1150120 A JP H1150120A
Authority
JP
Japan
Prior art keywords
hearth
reduced iron
raw material
remaining
furnace
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.)
Pending
Application number
JP20558797A
Other languages
Japanese (ja)
Inventor
Takazo Kawaguchi
尊三 川口
Yasuo Kamei
康夫 亀井
Yoshihisa Nakamura
義久 中村
Masahiko Hoshi
雅彦 星
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP20558797A priority Critical patent/JPH1150120A/en
Publication of JPH1150120A publication Critical patent/JPH1150120A/en
Pending legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Manufacture Of Iron (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a maintaining method of a hearth furnace which can keep the surface of the furnace hearth clean by removing the remaining iron on the rotary furnace hearth or preventing the remaining after discharging reduced iron. SOLUTION: (1) At the time of producing the reduced iron by charging a mixed raw material consisting of powdery iron raw material and a powdery solid reducing agent into the rotary hearth furnace and burning, the reduced iron powder remaining on the furnace hearth is blown off with injected gas flow at a midway between the reduced iron discharging part to the raw material charging part and removed from the surface of the furnace hearth. (2) The same remaining powder is swept out by a broom having rotating blades and removed from the surface of the furnace hearth. (3) The same remaining powder is scraped with a scraper enabling reciprocating movement in the direction crossing the shifting direction of the furnace hearth by bringing the lower end thereof into contact with the furnace hearth and removed from the surface of the furnace hearth. (4) The same remaining powder is sucked through a sucking hood 16 fitted to above the furnace hearth and removed from the surface of the furnace hearth 2. (5) The remaining of the reduced iron powder 19 on the furnace hearth is prevented with a scraper type gate 20 fitted to the rear part of a fixed stopper fence 5.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、粉状の鉄鉱石や鉄
分を含んだダスト、スラッジ、スケール等の粉状鉄原料
と石炭、コークス等の粉状固体還元剤とを混合した原料
を回転床炉（炉床が水平に回転移動する加熱炉）に装入
して還元鉄を製造する際に、炉床上に残留する還元鉄粉
等を除去し、または炉床上での還元鉄粉の残留を防止し
て炉床を清浄に維持する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rotating a raw material obtained by mixing a powdery iron raw material such as dust, sludge and scale containing powdery iron ore and iron and a powdery solid reducing agent such as coal and coke. When reducing iron is manufactured by loading it into a floor furnace (heating furnace in which the hearth rotates horizontally), the reduced iron powder remaining on the hearth is removed, or the reduced iron powder remains on the hearth. The present invention relates to a method for preventing the heat generation and keeping the hearth clean.

【０００２】[0002]

【従来の技術】近年、粉状の鉄鉱石と粉状固体還元剤と
を混合して塊成化し、これを回転炉床に装入して還元鉄
を製造する技術が注目されている。2. Description of the Related Art In recent years, attention has been focused on a technique of mixing a powdery iron ore and a powdery solid reducing agent to form an agglomerate and charging the resulting mixture to a rotary hearth to produce reduced iron.

【０００３】この回転床炉は古くからあるロータリーキ
ルン炉とは異なり、設備コストが安価であるのが特徴で
あるが、一方、炉床が水平に回転するために原料の装入
および製品の排出に配慮が必要である。その技術の代表
的なものとしては、粉状の鉄鉱石と固体還元剤とを混合
して塊成化物（ペレット）となし、これを高温に加熱す
ることにより鉄鉱石中の酸化鉄を還元して固体状金属鉄
とする技術がある（例えば、米国特許第３，４４３，９
３１号明細書、特開平７−２３８３０７号公報）。[0003] Unlike a rotary kiln furnace which has been used for a long time, this rotary hearth furnace is characterized in that the equipment cost is low. On the other hand, since the hearth rotates horizontally, it is necessary to charge raw materials and discharge products. Care must be taken. As a typical example of the technology, a powdered iron ore is mixed with a solid reducing agent to form an agglomerate (pellet), which is heated to a high temperature to reduce iron oxide in the iron ore. (See, for example, US Pat. No. 3,443,9).
31, specification, JP-A-7-238307).

【０００４】図１は、加熱を回転床炉を用いて行う従来
の還元鉄の製造プロセスの一例の概略図である。図示す
るように、粉鉄鉱石と粉石炭にバインダーとしてのベン
トナイトを添加し、混練機で、さらに水分とタールを添
加して混合する。この混合原料をペレタイザーまたはダ
ブルロール圧縮機で塊成化し、回転床炉の原料装入部へ
移送して炉内へ装入し、炉床の移動に伴って１回転させ
る間に鉄鉱石中の酸化鉄を高温還元して固体状金属鉄と
する。得られた金属鉄は排出部から取り出される。FIG. 1 is a schematic view showing an example of a conventional reduced iron production process in which heating is performed using a rotary bed furnace. As shown in the figure, bentonite as a binder is added to fine iron ore and fine coal, and water and tar are further added and mixed by a kneader. This mixed raw material is agglomerated by a pelletizer or a double-roll compressor, transferred to a raw material charging section of a rotary hearth furnace, charged into the furnace, and rotated once along with the movement of the hearth while the iron ore in the iron ore is rotated. Iron oxide is reduced at high temperature to form solid metallic iron. The obtained metallic iron is taken out from the discharge part.

【０００５】上記の還元鉄の製造方法において、粉状鉄
原料としては、粉状の鉄鉱石の他に、製鉄所で発生する
鉄分を含んだ各種のダストやスラッジ、スケールなどが
使用でき、また、粉状固体還元剤としては、石炭、コー
クス、チャー、オイルコークスなどが使用可能である。
これら鉄原料や固体還元剤は、場合によっては乾燥処
理、破砕処理が施される。[0005] In the above-mentioned method for producing reduced iron, as the powdered iron raw material, in addition to powdered iron ore, various dusts, sludges, scales, etc. containing iron generated in ironworks can be used. As the powdery solid reducing agent, coal, coke, char, oil coke and the like can be used.
These iron raw materials and solid reducing agents may be subjected to drying treatment and crushing treatment in some cases.

【０００６】粉状鉄原料と粉状固体還元剤は、次いで混
練処理されるが、その際、必要に応じてバインダーとし
ての水分、タール、糖蜜、有機系樹脂、セメント、スラ
グ、ベントナイト、生石灰、軽焼ドロマイト、消石灰が
添加される。The powdered iron raw material and the powdered solid reducing agent are then kneaded. At this time, if necessary, water as a binder, tar, molasses, organic resin, cement, slag, bentonite, quicklime, Light dolomite and slaked lime are added.

【０００７】混練された原料は、デスクペレタイザイー
により球状のペレットに、またはダブルロール圧縮機に
よりブリケットに塊成化される。この場合、ペレットに
するためには粒径が０．１ｍｍ以下の粒度の原料が適
し、ブリッケトには粒径が１ｍｍ以下の粒度のものが適
するので、あらかじめ所定の粒度に微粉砕する必要があ
る。また、塊成化物（上記のペレット、ブリケットを指
す）の強度を高めるため、塊成化後に乾燥処理または養
生処理が施される場合もある。The kneaded raw material is compacted into spherical pellets by a desk pelletizer or briquettes by a double roll compressor. In this case, a raw material having a particle size of 0.1 mm or less is suitable for forming a pellet, and a briquette having a particle size of 1 mm or less is suitable. . Further, in order to increase the strength of the agglomerate (refer to the above-mentioned pellets and briquettes), a drying treatment or a curing treatment may be performed after the agglomeration.

【０００８】得られた塊成化物は、ベルトコンベヤーで
回転床炉の上部に送られ、そこから回転炉床上に幅広く
分散するように装入シュートを用いて装入され、レベラ
ーによりならされる。続いて、炉内を移動する間に加熱
還元され、金属鉄となる。The agglomerates obtained are conveyed by belt conveyor to the upper part of a rotary hearth furnace, from where they are charged using a charging chute so as to be widely distributed on the rotary hearth and leveled by a leveler. Subsequently, it is reduced by heating while moving in the furnace and becomes metallic iron.

【０００９】回転床炉内は、炉内に燃料ガスと空気を送
り込み燃焼させることによって１１００〜１３００℃の
炉内温度が確保されている。この回転床炉の炉床上に上
記の塊成化物を１０〜２０ｍｍの薄い厚みで敷き、主に
炉内壁からの輻射熱で９００℃以上に昇温し、炉床が１
回転する間に所定の金属化率に達するように炉床の回転
速度を調整しつつ還元焼結させ、排出部からスクリュー
フィーダーにより排出する。In the rotary bed furnace, a furnace temperature of 1100 ° C. to 1300 ° C. is secured by feeding and burning fuel gas and air into the furnace. The above-mentioned agglomerate was spread on the hearth of this rotary hearth furnace at a thin thickness of 10 to 20 mm, and the temperature was raised to 900 ° C. or more mainly by radiant heat from the furnace inner wall.
During the rotation, reduction sintering is performed while adjusting the rotation speed of the hearth so as to reach a predetermined metallization ratio, and the mixture is discharged from a discharge portion by a screw feeder.

【００１０】図２はこのスクリューフィーダーによる還
元鉄の排出方法の説明図で、（ａ）は回転炉床の上面
図、（ｂ）は排出部の近傍の縦断面図である。図示する
ように、原料装入部１から回転炉床２上に装入された原
料（図示せず）は炉床２の回転に伴って１回転する間に
原料中の酸化鉄が高温還元され、還元鉄として製品排出
部３からスクリューフィーダー４により排出される。排
出は、還元鉄がスクリューフィーダー４に到達した後、
スクリューの回転により炉床２の移動方向と直交する方
向（図中に白ぬき矢印で表示）に移動し、炉床２の外周
側へ排出されることにより行われる。この場合、スクリ
ューフィーダー４の後方（炉床移動方向側、すなわち下
流側）には、還元鉄製品を溜め置くための固定されたス
トッパーフェンス５が設けられている。なお、図示した
例では、炉床２の下側にレール６が取り付けられてお
り、固定された車輪７を駆動させることによって炉床２
は一定速度で回転する。炉内はシール水８によってシー
ルされている。FIGS. 2A and 2B are explanatory views of a method of discharging reduced iron by the screw feeder, wherein FIG. 2A is a top view of a rotary hearth, and FIG. 2B is a longitudinal sectional view near a discharge portion. As shown in the figure, the raw material (not shown) charged from the raw material charging section 1 onto the rotary hearth 2 is reduced at a high temperature by iron oxide in the raw material during one rotation accompanying the rotation of the hearth 2. The reduced iron is discharged from the product discharge section 3 by the screw feeder 4. After the reduced iron reaches the screw feeder 4,
The rotation of the screw moves in the direction orthogonal to the direction of movement of the hearth 2 (indicated by a white arrow in the figure) and is discharged to the outer peripheral side of the hearth 2. In this case, a fixed stopper fence 5 for storing the reduced iron product is provided behind the screw feeder 4 (on the hearth moving direction side, that is, on the downstream side). In the illustrated example, the rail 6 is attached to the lower side of the hearth 2, and the fixed wheel 7 is driven to drive the hearth 2.
Rotates at a constant speed. The inside of the furnace is sealed by seal water 8.

【００１１】上記の還元鉄製造プロセスにおいては、塊
成化物を回転床炉内へ装入する際、塊成化物が粉化して
粉が発生する。また、装入後においても、高温還元され
る際に割れが発生し、粉が生じる。こうして発生した粉
は回転床炉内で還元され金属鉄粉となるが、この鉄粉は
排出部に設置されているストッパーフェンスと炉床の隙
間をすりぬけて排出されずに炉床上に留まり、炉床の回
転に伴って再び原料装入部に送られて加熱を受けるとい
う循環を繰り返し、回転床炉内に滞留する。In the above-described reduced iron production process, when the agglomerate is charged into a rotary bed furnace, the agglomerate is pulverized to generate powder. In addition, even after charging, cracks occur during high-temperature reduction, and powder is generated. The powder generated in this way is reduced in the rotary hearth furnace to become metallic iron powder, but this iron powder does not pass through the gap between the stopper fence installed in the discharge part and the hearth and stays on the hearth without being discharged. With the rotation of the bed, the circulation is repeated such that the material is sent again to the raw material charging section and is heated, and stays in the rotary bed furnace.

【００１２】滞留した金属鉄粉は、６０分程度の時間で
は金属鉄粉のままであるが、さらに長時間炉内に滞留す
ると、鉄粉どうしが焼結して炉床上に付着し、やがて炉
床が鉄板でコーティングされた状態となり、場合によっ
ては熱変形して炉床面に凹凸を生じさせる。炉床面にこ
のような凹凸が発生すると、原料を焼成する際に焼成む
らが生じて還元鉄の金属化率が大幅に低下するのみなら
ず、操業に支障を来し、操業上の大きな問題にも発展し
かねない。さらに、炉床レンガに付着した鉄は、それに
機械的な力が加わるとレンガに剥離割れを生じさせる原
因にもなる。The retained metallic iron powder remains metallic iron powder for about 60 minutes, but if it remains in the furnace for a longer time, the iron powder sinters and adheres to the hearth, and eventually the furnace The floor is coated with an iron plate, and in some cases, is thermally deformed, causing irregularities on the hearth surface. When such irregularities occur on the hearth surface, uneven firing occurs during firing of the raw materials, which not only greatly reduces the metallization rate of reduced iron, but also hinders the operation and causes major operational problems. It could also develop. Further, iron attached to hearth bricks may cause peeling cracks in the bricks when a mechanical force is applied thereto.

【００１３】[0013]

【発明が解決しようとする課題】本発明は、還元鉄製造
の際の上記の問題を解決し、炉床上に滞留する金属鉄粉
や炉床レンガへの付着物を除去し、あるいは炉床上での
金属鉄粉の残留を防止して、炉床表面を常に清浄に保つ
ことができる回転床炉の維持方法を提供することを目的
としている。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the production of reduced iron, and removes metallic iron powder and deposits on hearth bricks remaining on the hearth, It is an object of the present invention to provide a method for maintaining a rotary hearth furnace which can prevent the metal iron powder from remaining and keep the hearth surface clean at all times.

【００１４】[0014]

【課題を解決するための手段】本発明の要旨は、下記
（１）〜（５）の回転床炉の維持方法にある。The gist of the present invention resides in the following (1) to (5) methods for maintaining a rotary bed furnace.

【００１５】（１）粉状鉄原料と粉状固体還元剤の混合
原料を回転炉床上に装入し、焼成して還元鉄を製造する
際に、炉床上に残留する還元鉄粉を、還元鉄の排出部か
ら原料装入部までの間で、噴射ガス流により吹き飛ばし
て炉床上から除去することを特徴とする回転炉床の維持
方法。(1) A mixed raw material of a powdered iron raw material and a powdered solid reducing agent is charged on a rotary hearth and baked to produce reduced iron, and the reduced iron powder remaining on the hearth is reduced. A method for maintaining a rotary hearth, comprising blowing off the iron from the hearth between the iron discharge part and the raw material charging part by a jet gas flow.

【００１６】（２）粉状鉄原料と粉状固体還元剤の混合
原料を回転炉床上に装入し、焼成して還元鉄を製造する
際に、炉床上に残留する還元鉄粉を、還元鉄の排出部か
ら原料装入部までの間で、回転する羽根を備える箒で掃
き出して炉床上から除去することを特徴とする回転炉床
の維持方法。(2) A mixed raw material of a powdered iron material and a powdered solid reducing agent is charged on a rotary hearth, and when reduced iron is produced by firing, the reduced iron powder remaining on the hearth is reduced. A method for maintaining a rotary hearth, comprising: sweeping out of a hearth with a broom provided with rotating blades between an iron discharge part and a raw material charging part.

【００１７】（３）粉状鉄原料と粉状固体還元剤の混合
原料を回転炉床上に装入し、焼成して還元鉄を製造する
際に、炉床上に残留する還元鉄粉および固着物を、還元
鉄の排出部から原料装入部までの間で、炉床の移動方向
と交差する方向に往復運動が可能で、かつ下端を炉床に
接触させたスクレーパーにより掻き取って炉床上から除
去することを特徴とする回転炉床の維持方法。(3) A mixed raw material of a powdered iron material and a powdered solid reducing agent is charged on a rotary hearth and fired to produce reduced iron. Can be reciprocated in the direction intersecting with the moving direction of the hearth between the reduced iron discharge part and the raw material charging part, and scraped from the hearth by scraping the lower end into contact with the hearth. A method for maintaining a rotary hearth, which comprises removing.

【００１８】（４）粉状鉄原料と粉状固体還元剤の混合
原料を回転炉床上に装入し、焼成して還元鉄を製造する
際に、炉床上に残留する還元鉄粉を、還元鉄の排出部か
ら原料装入部までの間に設けられた吸引フードを通して
吸引し、炉床上から除去することを特徴とする回転炉床
の維持方法。(4) A mixed raw material of a powdered iron raw material and a powdered solid reducing agent is charged on a rotary hearth and fired to produce reduced iron, and the reduced iron powder remaining on the hearth is reduced. A method for maintaining a rotary hearth, wherein suction is performed through a suction hood provided between an iron discharge part and a raw material charging part, and the rotary hearth is removed from the hearth.

【００１９】（５）粉状鉄原料と粉状固体還元剤の混合
原料を回転炉床上に装入し、焼成して還元鉄を製造する
際に、還元鉄の排出部に設けられた排鉱装置の固定スト
ッパーフェンスの炉床移動方向側に下端を炉床に接触さ
せて設けたスクレーパー型ゲートにより還元鉄粉の炉床
上での残留を防止することを特徴とする回転炉床の維持
方法。(5) A mixed raw material of a powdered iron raw material and a powdered solid reducing agent is charged on a rotary hearth and fired to produce reduced iron. A method for maintaining a rotary hearth, characterized in that reduced iron powder is prevented from remaining on the hearth by a scraper-type gate provided with the lower end of the fixed stopper fence of the device on the hearth moving direction side in contact with the hearth.

【００２０】ここで、「粉状鉄原料」とは、酸化鉄が主
成分の粉状の鉄原料であり、具体的には、前述した粉状
の鉄鉱石や製鉄所で発生する鉄分を含んだダスト、スラ
ッジ（例えば、焼結機発生ダスト、高炉発生ダスト、転
炉発生ダスト、圧延工場発生スラッジ）、スケール等を
いう。本発明においては、これらを単独で、または２種
以上の混合物状態で使用することができる。Here, the "pulverized iron raw material" is a powdered iron raw material containing iron oxide as a main component, and specifically includes the above-mentioned powdered iron ore and iron generated in an ironworks. Waste, sludge (eg, sintering machine generated dust, blast furnace generated dust, converter generated dust, rolling plant generated sludge), scale, and the like. In the present invention, these can be used alone or in a mixture of two or more.

【００２１】「粉状固体還元剤」とは、石炭、コーク
ス、チャー、オイルコークス等の、主に炭素を含む固体
物質の粉末である。これらも、単独で、または２種以上
組み合わせて使用することができる。The "powder solid reducing agent" is a powder of a solid substance mainly containing carbon, such as coal, coke, char and oil coke. These can also be used alone or in combination of two or more.

【００２２】「炉床上に残留する還元鉄粉」とは、前述
したように、原料装入時に生成した粉が還元されて生じ
た鉄粉、または還元焼成時や排鉱時における割れにより
発生した鉄粉であり、「固着物」とは、還元鉄粉が長時
間炉内に滞留した結果、鉄粉どうしが焼結して炉床状に
付着したものである。As described above, the "reduced iron powder remaining on the hearth" is, as described above, iron powder generated by reducing powder generated at the time of charging raw materials, or cracks generated during reduction firing or mining. Iron powder, and "fixed matter" refers to a substance in which reduced iron powder stays in the furnace for a long time, and as a result, the iron powder sinters and adheres to the hearth.

【００２３】また、「炉床の維持」とは、前記のよう
に、炉床表面に還元鉄粉や固着物を残留させず、あるい
はこれらを除去し、炉床表面を常に清浄に保つことをい
う。The term "maintenance of the hearth" as described above means that the reduced iron powder and the adhered substances are not left on the hearth surface or are removed to keep the hearth surface clean at all times. Say.

【００２４】[0024]

【発明の実施の形態】以下、本発明（上記（１）〜
（５）の発明）について詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention (the above (1) to
The invention (5) will be described in detail.

【００２５】（１）の発明は、上記のように、炉床上に
残留する還元鉄粉を、還元鉄の排出部から原料装入部ま
での間で、噴射ガス流により吹き飛ばして炉床上から除
去し、炉床表面を清浄に維持する方法である。なお、
「還元鉄の排出部から原料装入部までの間」とは、還元
鉄の排出部から炉床の移動方向に向かって原料装入部ま
での、原料やそれが還元されて生じた還元鉄が載置され
ていない炉床上の区間である。これは、以下に述べる
（２）〜（４）の発明においても同様である。According to the invention of (1), as described above, the reduced iron powder remaining on the hearth is blown off by a jet gas flow from the discharge part of the reduced iron to the raw material charging part and removed from the hearth. This is a method for maintaining the hearth surface clean. In addition,
"Between the reduced iron discharge section and the raw material charging section" refers to the raw material and the reduced iron produced by the reduction from the reduced iron discharge section to the raw material charging section in the moving direction of the hearth. Is a section on the hearth where no is placed. This is the same in the inventions (2) to (4) described below.

【００２６】図３は、この方法の一例の説明図である。
なお、図は、炉床の移動方向に対して垂直な断面を示
す。図示するように、ガス噴射ノズル９が斜め上方から
炉床表面に向けて配置されている。FIG. 3 is an explanatory diagram of an example of this method.
The figure shows a cross section perpendicular to the moving direction of the hearth. As shown in the figure, a gas injection nozzle 9 is disposed diagonally from above toward the hearth surface.

【００２７】（１）の発明の方法では、このガス噴射ノ
ズル９からガスを噴射して残留還元鉄粉１０を吹き飛ば
し、炉床表面を清浄に維持する。In the method (1) of the present invention, the gas is injected from the gas injection nozzle 9 to blow off the residual reduced iron powder 10, thereby keeping the hearth surface clean.

【００２８】ガス噴射ノズルの炉床表面に対する角度お
よび炉床表面からの高さは特に限定されない。還元鉄粉
を吹き飛ばして効果的に炉床上から除去できるように適
宜調整する。The angle of the gas injection nozzle with respect to the hearth surface and the height from the hearth surface are not particularly limited. An appropriate adjustment is made so that the reduced iron powder can be effectively blown off and removed from the hearth.

【００２９】ガスの噴射は、炉床の移動方向と直交する
方向に並べて設置したノズルから炉床の移動方向に向け
て行ってもよいが、図示するように、炉床２の移動方向
と直交する方向ないしはそれに近い方向に往復移動可能
なガス噴射ノズル９を用い、このノズル９を図中に矢印
で示すように往復移動させながら行うのが望ましい。The gas may be injected from the nozzles arranged side by side in the direction perpendicular to the direction of movement of the hearth in the direction of movement of the hearth 2, as shown in the figure. It is desirable to use a gas injection nozzle 9 that can reciprocate in a direction that is close to or in the direction in which the nozzle 9 moves, and that the nozzle 9 reciprocates as shown by the arrow in the figure.

【００３０】ガス噴射ノズルは、先端の断面形状が円形
もしくはそれに近い場合は、一本ではなく、炉床の円周
方向に複数本並列に配置して用いるのが望ましい。ま
た、実施例で用いたノズルのように、ノズルの先端の断
面形状が偏平で炉床の円周方向に広がっているノズルを
使用してもよい。When the cross-sectional shape of the gas injection nozzle is circular or close to it, it is desirable to use not a single gas injection nozzle but a plurality of gas injection nozzles in parallel in the circumferential direction of the hearth. Further, like the nozzle used in the embodiment, a nozzle having a flat cross section at the tip of the nozzle and extending in the circumferential direction of the hearth may be used.

【００３１】噴射するガスの種類は特に限定されない
が、炉床レンガの保護と残留する還元鉄粉の再酸化の防
止の観点から、窒素ガスが望ましい。なお、ガスの噴射
圧力についても限定はなく、還元鉄粉を効果的に炉床上
から除去できるように適宜調整すればよい。The type of gas to be injected is not particularly limited, but nitrogen gas is preferable from the viewpoint of protecting the hearth brick and preventing reoxidation of the remaining reduced iron powder. The gas injection pressure is not limited, and may be appropriately adjusted so that the reduced iron powder can be effectively removed from the hearth.

【００３２】（２）の発明は、炉床上に残留する還元鉄
粉を、還元鉄の排出部から原料装入部までの間で、回転
する羽根を備える箒で掃き出すことにより炉床上から除
去して炉床表面を清浄に維持する方法である。なお、こ
こでいう「回転する羽根を備える箒」とは、炉床上に残
留還元鉄粉を掃き出すという清掃の機能を有するものを
いい、羽根ないしは羽根状のものを有する箒に限らず、
一定の固さと太さをもった毛状のものを有する箒（通
常、“ブラシ”と称されるもの）等でもよい。In the invention of (2), the reduced iron powder remaining on the hearth is removed from the hearth by sweeping it with a broom equipped with rotating blades from the discharge part of the reduced iron to the raw material charging part. This is a method of keeping the hearth surface clean. The term `` broom with rotating blades '' as used herein refers to a broom having a cleaning function of sweeping out residual reduced iron powder on the hearth, and is not limited to a broom having blades or blade-like ones.
A broom (usually referred to as a "brush") having a hair-like shape having a certain hardness and thickness may be used.

【００３３】回転する羽根を備える箒としては、例え
ば、周囲に清掃ブラシを保有する円筒状の箒で、この円
筒の軸を回転軸として正逆方向に回転可能（つまり、回
動可能）に構成されたものを用いればよい。次に述べる
図４の拡大図に示す回転羽根箒１３がこれに該当する。The broom having rotating blades is, for example, a cylindrical broom having a cleaning brush around it, and is configured to be rotatable (that is, rotatable) in the forward and reverse directions about the axis of the cylinder as a rotation axis. What is done may be used. The rotary blade broom 13 shown in the enlarged view of FIG. 4 described below corresponds to this.

【００３４】このような回転する羽根を備える箒を用
い、これを適宜正方向または逆方向に回転させるととも
に炉床の移動方向と直交する方向ないしはそれに近い方
向に往復移動させながら残留還元鉄粉を掃き出して炉床
上から除去する。A broom equipped with such rotating blades is used. The broom is rotated in the forward or reverse direction as appropriate, and the residual reduced iron powder is reciprocated in a direction orthogonal to or close to the direction of movement of the hearth. Sweep out and remove from hearth.

【００３５】図４は、前記の（２）の発明の方法の望ま
しい一例の説明図である。なお、図は、炉床の移動方向
に対して垂直な断面を示す。FIG. 4 is an explanatory view of a preferred example of the method of the invention (2). The figure shows a cross section perpendicular to the moving direction of the hearth.

【００３６】この例では、回転する羽根を備える箒とし
て、周囲に清掃ブラシ１１を保有する円筒状の箒であっ
てその円筒の軸１２を回転軸として正逆方向に回転可能
に構成された回転羽根箒１３（拡大図参照）を、その円
筒の軸と直交する方向に多数連結して環状の回転羽根箒
群１４としたものを用いる。すなわち、この回転羽根箒
群１４を、還元鉄の排出部から原料装入部までの間で、
炉床２の幅方向に複数台配置し（図示した例では２台配
置）、回転羽根箒群１４を構成するそれぞれの回転羽根
箒１３を適宜正方向または逆方向に回転させるとともに
環状をなす回転羽根箒群１４の環自体を炉床２の移動方
向と直交する方向ないしはそれに近い方向に向けて正方
向または逆方向に回転させ、炉床上の残留還元鉄粉を除
去する。環状の回転羽根箒群１４を炉床上に１台配置
し、これを上記のように回転させながら炉床２の移動方
向と直交する方向ないしはそれに近い方向に往復移動さ
せてもよい。In this embodiment, a broom having rotating blades is a cylindrical broom having a cleaning brush 11 around it, and is rotatable in the normal and reverse directions around the cylindrical shaft 12 as a rotation axis. A plurality of blade brooms 13 (see an enlarged view) are connected in a direction orthogonal to the axis of the cylinder to form a group of rotating rotary brooms 14. That is, the rotating blade broom group 14 is moved from the reduced iron discharge section to the raw material charging section,
A plurality of rotating brooms 13 are arranged in the width direction of the hearth 2 (two are arranged in the illustrated example), and the rotating brooms 13 constituting the rotating broom group 14 are appropriately rotated in the forward direction or the reverse direction, and the circular rotation is performed. The ring of the broom group 14 is rotated in a forward or reverse direction in a direction orthogonal to or close to the moving direction of the hearth 2 to remove residual reduced iron powder on the hearth. One annular rotating blade broom group 14 may be arranged on the hearth, and may be reciprocated in a direction orthogonal to or close to the moving direction of the hearth 2 while rotating as described above.

【００３７】この環状の回転羽根箒群を用いれば、残留
する鉄粉を短時間で効率よく除去し、炉床表面を清浄に
維持することができる。The use of the ring-shaped rotating blade broom group makes it possible to efficiently remove the remaining iron powder in a short time and keep the hearth surface clean.

【００３８】回転羽根箒の幅（回転軸方向の長さ）は、
特に限定されないが、回転炉床の幅と同じくらいにする
のが望ましい。The width of the rotating blade broom (the length in the direction of the rotating shaft) is
Although not particularly limited, it is desirable that the width is approximately equal to the width of the rotary hearth.

【００３９】回転羽根箒の移動速度も特に限定されない
が、炉床の幅と同じ程度の幅を有する回転羽根箒で炉床
面全体を清掃するとすれば、少なくとも炉床の移動速度
と同程度以上の速度とする必要がある。Although the moving speed of the rotating blade broom is not particularly limited, if the entire hearth surface is cleaned with a rotating blade broom having a width approximately equal to the width of the hearth, it is at least equal to or higher than the moving speed of the hearth. Speed.

【００４０】（３）の発明は、炉床上に残留する還元鉄
粉および固着物を、還元鉄の排出部から原料装入部まで
の間で、スクレーパーで掻き取ることにより除去して炉
床表面を清浄に維持する方法である。According to the invention of (3), the reduced iron powder and the adhered substances remaining on the hearth are removed by scraping with a scraper between the reduced iron discharge part and the raw material charging part, and the hearth surface is removed. Is a method of maintaining the cleanliness.

【００４１】図５は、この方法の一例の説明図である。
なお、図は、炉床の移動方向に対して垂直な断面を示
す。図示するように、スクレーパー１５は、その下端が
炉床面と接触しており、炉床２の移動方向と交差する方
向に往復運動できるように構成されている。なお、炉床
の移動方向と交差する方向とは、炉床の移動方向と直交
する方向、ないしはそれに近い方向（直交する方向に対
して２０゜以下または−２０゜以上の角度をなす方向）
をいう。FIG. 5 is an explanatory diagram of an example of this method.
The figure shows a cross section perpendicular to the moving direction of the hearth. As shown in the drawing, the scraper 15 has a lower end in contact with the hearth surface, and is configured to be able to reciprocate in a direction intersecting the moving direction of the hearth 2. The direction intersecting with the direction of movement of the hearth is a direction orthogonal to the direction of movement of the hearth or a direction close thereto (a direction making an angle of 20 ° or less or −20 ° or more with respect to the orthogonal direction).
Say.

【００４２】（３）の発明の方法では、このスクレーパ
ーを炉床の移動方向と交差する方向に往復運動させなが
ら炉床上に残留する還元鉄粉および固着物を掻き取って
炉床上から除去する。スクレーパーの移動距離を短くす
るという点からすれば、炉床の移動方向と直交する方向
に往復運動させるのが望ましいといえる。図示するよう
に、スクレーパーの先端部に適度な角度を付けておけ
ば、掻き取り効果が大きく、炉床上に付着した固着物も
除去できる。In the method of the invention (3), the scraper is reciprocated in a direction intersecting the moving direction of the hearth while scraping the reduced iron powder and the adhered matter remaining on the hearth and removing it from the hearth. From the viewpoint of shortening the moving distance of the scraper, it can be said that it is desirable to reciprocate in the direction orthogonal to the moving direction of the hearth. As shown in the figure, if a proper angle is formed at the tip of the scraper, the scraping effect is large, and the adhered matter adhered to the hearth can be removed.

【００４３】スクレーパーの幅は回転炉床の幅と同じく
らいが望ましい。The width of the scraper is desirably about the same as the width of the rotary hearth.

【００４４】スクレーパーの移動速度は、炉床の幅と同
じ程度の幅を有し、炉床の移動方向と直交する方向に往
復運動するスクレーパーで炉床面全体を清浄化しようと
すれば、次の掻き取りに備えてスクレーパーを往復移動
させなければならないので、炉床の移動速度の少なくと
も２倍とする必要がある。例えば、回転炉床が、幅５ｍ
で、回転速度が約１２ｍ／ｍｉｎであるとすれば、幅５
ｍのスクレーパーを用い、平均移動速度を２４ｍ／ｍｉ
ｎ以上とすれば、一回あたり０．２０分（片道、つまり
炉床の内円部から外円部）以内で還元鉄粉および固着物
を除去できることになる。The moving speed of the scraper has a width approximately equal to the width of the hearth, and if the scraper reciprocating in the direction perpendicular to the moving direction of the hearth is intended to clean the entire hearth surface, the following is required. The scraper must be moved back and forth in preparation for the scraping of the hearth, so that the moving speed of the hearth must be at least twice as high. For example, the rotating hearth has a width of 5 m
If the rotation speed is about 12 m / min, the width 5
m using a scraper with an average moving speed of 24 m / mi
If n or more, the reduced iron powder and the adhered matter can be removed within 0.20 minutes (one way, that is, from the inner circle to the outer circle of the hearth) at one time.

【００４５】（４）の発明は、炉床上に残留する還元鉄
粉を、還元鉄の排出部から原料装入部までの間に設けら
れた吸引フードを通し吸引ブロワまたはエジェクター方
式により吸引し、炉床上から除去して炉床表面を清浄に
維持する方法である。According to the invention (4), the reduced iron powder remaining on the hearth is sucked by a suction blower or an ejector system through a suction hood provided between a discharge portion of the reduced iron and a material charging portion, and In this method, the hearth surface is kept clean by removing it from the hearth.

【００４６】図６は、この方法のうち吸引ブロワにより
吸引する場合の一例の説明図である。なお、図は、炉床
の移動方向に対して垂直な断面を示す。FIG. 6 is an explanatory diagram of an example of a case where suction is performed by a suction blower in this method. The figure shows a cross section perpendicular to the moving direction of the hearth.

【００４７】図示するように、還元鉄の排出部から原料
装入部までの間の炉床上に吸引フード１６（図示した例
では、６区画に分割されている）が設けられており、分
割されたそれぞれの吸引フード１６は最終的に１本の管
にまとめられ、バグフィルター１７を経て吸引ブロワー
１８に接続されている。炉床上に残留する還元鉄粉は、
この吸引ブロワー１８によって吸引され、バグフィルタ
ー１７で回収される。As shown in the figure, a suction hood 16 (in the example shown, divided into six sections) is provided on the hearth between the reduced iron discharge section and the raw material charging section. The suction hoods 16 are finally combined into one tube and connected to a suction blower 18 via a bag filter 17. Reduced iron powder remaining on the hearth
It is sucked by the suction blower 18 and collected by the bag filter 17.

【００４８】吸引フードは、炉床２の幅全体にわたって
設けられているのが望ましい。The suction hood is desirably provided over the entire width of the hearth 2.

【００４９】この方法は、還元された後、６０分程度未
満のそれほど時間が経っていない鉄粉の除去に特に有効
である。This method is particularly effective for removing iron powder that has not been reduced for less than about 60 minutes after being reduced.

【００５０】（５）の発明は、還元鉄粉の炉床上での残
留を極力防止して炉床表面を清浄に維持する方法であっ
て、還元鉄の排出部に設けられた排鉱装置（通常使用さ
れるスクリューフィーダー型排鉱装置）の固定ストッパ
ーフェンスの炉床移動方向側、すなわち下流側にスクレ
ーパー型ゲートを設けておく方法である。The invention of (5) is a method for keeping the surface of the hearth clean by minimizing the residual of the reduced iron powder on the hearth. This is a method in which a scraper-type gate is provided on the furnace floor moving direction side of a fixed stopper fence of a commonly used screw feeder-type mining apparatus, that is, on the downstream side.

【００５１】図７は、この方法の一例の説明図である。
なお、図は、炉床の移動方向（図中に矢印で表示）に平
行な縦断面を示す。図示するように、スクリューフィー
ダー４の後方（下流側）に設けられた還元鉄製品２１を
溜め置くための固定ストッパーフェンス５の炉床移動方
向側に、下端を炉床面に接触させてスクレーパー型ゲー
ト２０を設けておく。FIG. 7 is an explanatory diagram of an example of this method.
The figure shows a vertical section parallel to the moving direction of the hearth (indicated by an arrow in the figure). As shown in the drawing, the lower end is brought into contact with the hearth surface of the fixed stopper fence 5 provided behind the screw feeder 4 (downstream side) for holding the reduced iron products 21 on the hearth moving surface. A gate 20 is provided.

【００５２】固定ストッパーフェンス５と炉床面との間
には若干の隙間が存在するが、この隙間は還元鉄を排出
する際の還元鉄と炉床面の摩耗によって徐々に拡大す
る。そのため、還元鉄粉１９はこの隙間をすりぬけて排
出されずに炉床上に留まり、炉床の回転に伴って再び原
料装入部に送られて加熱を受けるという循環を繰り返
し、回転床炉内に滞留する。そこで、固定ストッパーフ
ェンス５の炉床移動方向側にスクレーパー型ゲート２０
を設ける。このスクレーパー型ゲート２０は、上方から
軽く炉床２面に押さえつけられ、炉床面に接触して炉床
面との間の隙間を塞ぐように構成されているので、固定
ストッパーフェンス５と炉床面との間の隙間をすりぬけ
てもスクレーパー型ゲート２０によって通過が阻止さ
れ、還元鉄粉１９の炉床上における残留が防止されて炉
床表面が清浄に維持される。Although there is a slight gap between the fixed stopper fence 5 and the hearth surface, this gap gradually increases due to wear of the reduced iron and the hearth surface when discharging the reduced iron. Therefore, the reduced iron powder 19 stays on the hearth without slipping through the gap and being discharged, and is repeatedly sent to the raw material charging section with the rotation of the hearth and is heated again. Stay. Therefore, a scraper-type gate 20 is provided on the side of the hearth moving direction of the fixed stopper fence 5.
Is provided. Since the scraper type gate 20 is configured to be lightly pressed against the hearth 2 surface from above and to be in contact with the hearth surface to close a gap between the scraper type gate 20 and the hearth surface, the fixed stopper fence 5 and the hearth The scraper-type gate 20 prevents passage of the reduced iron powder 19 even if the gap between the furnace and the surface is passed, prevents the reduced iron powder 19 from remaining on the hearth, and keeps the hearth surface clean.

【００５３】スクレーパー型ゲート２０の設置位置は、
ゲート２０を炉床２上に軽く押さえつけるのに支障がな
い限り、固定ストッパーフェンス５のすぐ後方、すなわ
ち、図示するようにストッパーフェンス５に密着させて
取り付けるのが望ましい。また、このスクレーパー型ゲ
ート２０は、固定ストッパーフェンス５と炉床面との間
の隙間（間隔）が炉床の幅方向で異なっている場合に対
応できるように、幅方向に分割しておくことが望まし
い。The installation position of the scraper type gate 20 is as follows.
As long as there is no problem in lightly pressing the gate 20 on the hearth 2, it is desirable to mount the gate 20 immediately behind the fixed stopper fence 5, that is, in close contact with the stopper fence 5 as illustrated. The scraper-type gate 20 should be divided in the width direction so as to cope with a case where the gap (interval) between the fixed stopper fence 5 and the hearth surface is different in the width direction of the hearth. Is desirable.

【００５４】この方法によれば、炉床上における還元鉄
粉の残留を未然に防いで炉床を清浄に維持することがで
きる。According to this method, the hearth can be maintained clean by preventing the reduced iron powder from remaining on the hearth.

【００５５】上記（１）〜（５）の発明は、回転床炉に
装入する原料の形状には関係なく、粉体状、ペレット、
ブリッケト、タイル状、板状、シート状などどのような
場合にも適用できる技術である。The inventions of the above (1) to (5) can be applied to powder, pellets,
This is a technique that can be applied to any case such as brick, tile, plate, and sheet.

【００５６】また、これらの各方法は、それぞれ単独で
実施しても効果があるが、例えば、（５）のストッパー
フェンスを取り付ける方法と（１）〜（４）のうちのい
ずれかの方法、あるいは（１）または（４）の方法と
（３）のスクレーパーにより掻き取る方法等、複数の方
法を組み合わせることによって更に効果を高めることが
できる。Each of these methods is effective even if it is performed independently. For example, the method of attaching the stopper fence of (5) and the method of any one of (1) to (4), Alternatively, the effect can be further enhanced by combining a plurality of methods such as the method of (1) or (4) and the method of scraping with the scraper of (3).

【００５７】上記本発明の方法によれば、回転床炉内の
還元鉄の排出部において還元鉄粉やレンガへの固着物を
炉外へ排出し、あるいは還元鉄粉の炉床上における残留
を防止して、炉床表面を清浄に保つことができる。その
結果、還元鉄粉の付着等による炉床面での凹凸の発生に
起因する焼成むらを防止して還元鉄の金属化率の大幅な
低下を抑制し、操業上のトラブルを未然に防ぐととも
に、炉床レンガの剥離割れを防止することができる。According to the method of the present invention, the reduced iron powder and the solid matter adhered to the brick are discharged out of the furnace at the discharge section of the reduced iron in the rotary bed furnace, or the reduced iron powder is prevented from remaining on the hearth. Thus, the hearth surface can be kept clean. As a result, it is possible to prevent uneven firing due to the occurrence of unevenness on the hearth surface due to the adhesion of reduced iron powder, etc., to suppress a significant decrease in the metallization rate of reduced iron, and to prevent operational problems beforehand. In addition, cracks in the hearth brick can be prevented.

【００５８】[0058]

【実施例】表１に示す粉鉄鉱石と表２に示す粉石炭を用
い、表３に示す配合率で配合した後、表５に示すＮｏ．
１〜Ｎｏ．６のケースに示す方法で炉床上に残留する鉄
粉を除去しつつ、もしくは炉床上に還元鉄粉を残留させ
ずに還元鉄を製造し、そのときの還元鉄の金属化率によ
り本発明の効果を評価した。EXAMPLES Using the fine iron ore shown in Table 1 and the fine coal shown in Table 2 and blending them at the blending ratio shown in Table 3, the powders of No.
1 to No. In the method shown in Case 6, reduced iron is produced while removing the iron powder remaining on the hearth or without leaving the reduced iron powder on the hearth, and the metallization ratio of the reduced iron at this time indicates the present invention. The effect was evaluated.

【００５９】還元鉄の製造は、前記の図１に示した製造
工程にのっとり、配合した原料を混合した後、ダブルロ
ール圧縮機によりブリッケトに成形し、その後、回転床
炉に装入し、焼成することにより行った。用いた回転床
炉の設備仕様と操業条件を表４に示す。In the production of reduced iron, following the production process shown in FIG. 1, the blended raw materials are mixed, molded into briquettes by a double roll compressor, and then charged into a rotary bed furnace and fired. It was done by doing. Table 4 shows the equipment specifications and operating conditions of the rotary hearth furnace used.

【００６０】[0060]

【表１】 [Table 1]

【００６１】[0061]

【表２】 [Table 2]

【００６２】[0062]

【表３】 [Table 3]

【００６３】[0063]

【表４】 [Table 4]

【００６４】[0064]

【表５】 [Table 5]

【００６５】Ｎｏ．１のケースは従来例で、還元鉄を前
記の図２に示したスクリューフィーダーにより排出した
後、炉床上に残留する還元鉄粉を除去せずに操業した場
合である。No. Case 1 is a conventional example, in which the reduced iron is discharged by the screw feeder shown in FIG. 2 and then the operation is performed without removing the reduced iron powder remaining on the hearth.

【００６６】Ｎｏ．２〜Ｎｏ．６のケースは本発明例
で、Ｎｏ．２は図３に示したガス噴射ノズルからＮ2 を
噴射して残留還元鉄粉を吹き飛ばして除去した場合、Ｎ
ｏ．３は図４に示した多数の回転羽根箒を連結した回転
羽根箒群により残留還元鉄粉を除去した場合、Ｎｏ．４
のケースは図５に示したスクレーパーにより残留還元鉄
粉を除去した場合、Ｎｏ．５のケースは図６に示した吸
引フードにより残留還元鉄粉を除去した場合、Ｎｏ．６
のケースは図７に示したスクレーパー型ゲートによって
還元鉄粉の炉床上における残留を防止した場合である。No. 2-No. The case of No. 6 is an example of the present invention. 2 indicates that when N 2 is injected from the gas injection nozzle shown in FIG. 3 to blow off and remove the residual reduced iron powder,
o. No. 3 shows a case where the residual reduced iron powder was removed by a group of rotary blades connected to a number of rotary blades shown in FIG. 4
In the case of No., when the residual reduced iron powder was removed by the scraper shown in FIG. In the case of No. 5, when the residual reduced iron powder was removed by the suction hood shown in FIG. 6
In the case (1), the scraper-type gate shown in FIG. 7 prevents the reduced iron powder from remaining on the hearth.

【００６７】前記の表５にそれぞれのケースにおける還
元鉄の金属化率を示したが、本発明例では従来例に較
べ、還元鉄の金属化率を高く維持できた。これは、本発
明例では炉床上に残留する還元鉄粉を還元鉄の排出毎に
除去した結果、あるいは還元鉄粉の炉床上における残留
を防止した結果、むら焼成が低減したことによるもので
ある。Table 5 shows the metallization ratio of reduced iron in each case. In the present invention, the metallization ratio of reduced iron could be maintained higher than in the conventional example. This is because, in the example of the present invention, the reduced iron powder remaining on the hearth was removed every time the reduced iron was discharged, or the reduced iron powder was prevented from remaining on the hearth, resulting in reduced uneven firing. .

【００６８】[0068]

【発明の効果】本発明の方法によれば、回転床炉内の還
元鉄の排出部において還元により生じた鉄粉やレンガへ
の固着物を炉外へ排出して除去し、あるいは還元鉄粉の
炉床上における残留を防いで、炉床表面を清浄に保つこ
とができる。その結果、焼成むらを防止して還元鉄の金
属化率の大幅な低下を抑制し、操業上のトラブルを未然
に防ぐことができる。According to the method of the present invention, iron powder generated by reduction at the discharge section of the reduced iron in the rotary bed furnace and the adhered matter to the bricks are discharged to the outside of the furnace to remove or reduce the reduced iron powder. Can be prevented from remaining on the hearth, and the hearth surface can be kept clean. As a result, it is possible to prevent uneven firing and to suppress a large decrease in the metallization ratio of reduced iron, thereby preventing operational troubles.

【図面の簡単な説明】[Brief description of the drawings]

【図１】回転床炉を用いて行う従来の還元鉄の製造プロ
セスの一例の概略図である。FIG. 1 is a schematic view of an example of a conventional reduced iron production process performed using a rotary hearth furnace.

【図２】従来の回転床炉からの還元鉄の排出方法の説明
図である。FIG. 2 is an explanatory view of a conventional method for discharging reduced iron from a rotary bed furnace.

【図３】本発明の炉床上に残留する還元鉄粉等の除去方
法の一例の説明図で、ガス噴射ノズルを用いる場合であ
る。FIG. 3 is a diagram illustrating an example of a method for removing reduced iron powder or the like remaining on a hearth according to the present invention, in which a gas injection nozzle is used.

【図４】本発明の炉床上に残留する還元鉄粉等の除去方
法の一例の説明図で、回転羽根箒群を用いる場合であ
る。FIG. 4 is an explanatory view of an example of the method for removing reduced iron powder and the like remaining on the hearth of the present invention, in which a rotating blade broom group is used.

【図５】本発明の炉床上に残留する還元鉄粉等の除去方
法の一例の説明図で、スクレーパーを用いる場合であ
る。FIG. 5 is an explanatory view of an example of a method for removing reduced iron powder or the like remaining on a hearth according to the present invention, in which a scraper is used.

【図６】本発明の炉床上に残留する還元鉄粉等の除去方
法の一例の説明図で、吸引フードを用いる場合である。FIG. 6 is an explanatory view of an example of a method for removing reduced iron powder or the like remaining on a hearth according to the present invention, in which a suction hood is used.

【図７】本発明の炉床上における還元鉄粉等の残留の防
止方法の一例の説明図で、スクレーパー型ゲートを用い
る場合である。FIG. 7 is an explanatory view of an example of a method for preventing reduced iron powder or the like from remaining on a hearth according to the present invention, in which a scraper type gate is used.

【符号の説明】[Explanation of symbols]

１：原料装入部 ２：回転炉床 ３：製品排出部 ４：スクリューフィーダー ５ ストッパーフェンス ６：レール ７：車輪 ８：シール水 ９：ガス噴射ノズル １０：残留還元鉄粉 １１：清掃ブラシ １２：軸 １３：回転羽根箒 １４：回転羽根箒群 １５：スクレーパー １６：吸引フード １７：バグフィルター １８：吸引ブロワー １９：還元鉄粉 ２０：スクレーパー型ゲート ２１：還元鉄製品 1: Raw material charging section 2: Rotating hearth 3: Product discharge section 4: Screw feeder 5 Stopper fence 6: Rail 7: Wheel 8: Seal water 9: Gas injection nozzle 10: Residual reduced iron powder 11: Cleaning brush 12: Shaft 13: Rotating blade broom 14: Rotating blade broom group 15: Scraper 16: Suction hood 17: Bag filter 18: Suction blower 19: Reduced iron powder 20: Scraper type gate 21: Reduced iron product

───────────────────────────────────────────────────── フロントページの続き (72)発明者 星 雅彦 大阪府大阪市中央区北浜４丁目５番33号住 友金属工業株式会社内 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Masahiko Hoshi 4-5-33 Kitahama, Chuo-ku, Osaka City, Osaka Inside Sumitomo Metal Industries, Ltd.

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】粉状鉄原料と粉状固体還元剤の混合原料を
回転炉床上に装入し、焼成して還元鉄を製造する際に、
炉床上に残留する還元鉄粉を、還元鉄の排出部から原料
装入部までの間で、噴射ガス流により吹き飛ばして炉床
上から除去することを特徴とする回転炉床の維持方法。1. A mixed raw material of a powdered iron raw material and a powdered solid reducing agent is charged on a rotary hearth and fired to produce reduced iron.
A method for maintaining a rotary hearth, characterized in that reduced iron powder remaining on the hearth is blown away from the hearth between the reduced iron discharge part and the raw material charging part by a jet gas flow to remove the reduced iron powder from the hearth. 【請求項２】粉状鉄原料と粉状固体還元剤の混合原料を
回転炉床上に装入し、焼成して還元鉄を製造する際に、
炉床上に残留する還元鉄粉を、還元鉄の排出部から原料
装入部までの間で、回転する羽根を備える箒で掃き出し
て炉床上から除去することを特徴とする回転炉床の維持
方法。2. A mixed raw material of a powdered iron raw material and a powdered solid reducing agent is charged on a rotary hearth and fired to produce reduced iron.
A method for maintaining a rotary hearth, wherein the reduced iron powder remaining on the hearth is removed from the hearth by sweeping with a broom equipped with rotating blades between the reduced iron discharge part and the raw material charging part. . 【請求項３】粉状鉄原料と粉状固体還元剤の混合原料を
回転炉床上に装入し、焼成して還元鉄を製造する際に、
炉床上に残留する還元鉄粉および固着物を、還元鉄の排
出部から原料装入部までの間で、炉床の移動方向と交差
する方向に往復運動が可能で、かつ下端を炉床に接触さ
せたスクレーパーにより掻き取って炉床上から除去する
ことを特徴とする回転炉床の維持方法。3. A mixed raw material of a powdered iron raw material and a powdered solid reducing agent is charged on a rotary hearth and fired to produce reduced iron.
The reduced iron powder and solids remaining on the hearth can reciprocate in a direction intersecting with the direction of movement of the hearth between the reduced iron discharge part and the raw material charging part, and the lower end can be moved to the hearth. A method for maintaining a rotary hearth, wherein the scraper is scraped off from the hearth with a scraper in contact therewith. 【請求項４】粉状鉄原料と粉状固体還元剤の混合原料を
回転炉床上に装入し、焼成して還元鉄を製造する際に、
炉床上に残留する還元鉄粉を、還元鉄の排出部から原料
装入部までの間に設けられた吸引フードを通して吸引
し、炉床上から除去することを特徴とする回転炉床の維
持方法。4. A mixed raw material of a powdered iron raw material and a powdered solid reducing agent is charged on a rotary hearth and fired to produce reduced iron.
A method for maintaining a rotary hearth, wherein the reduced iron powder remaining on the hearth is sucked through a suction hood provided between a reduced iron discharge part and a raw material charging part, and removed from the hearth. 【請求項５】粉状鉄原料と粉状固体還元剤の混合原料を
回転炉床上に装入し、焼成して還元鉄を製造する際に、
還元鉄の排出部に設けられた排鉱装置の固定ストッパー
フェンスの炉床移動方向側に下端を炉床に接触させて設
けたスクレーパー型ゲートにより還元鉄粉の炉床上での
残留を防止することを特徴とする回転炉床の維持方法。5. A mixed raw material of a powdered iron raw material and a powdered solid reducing agent is charged on a rotary hearth and fired to produce reduced iron.
Preventing the reduction iron powder from remaining on the hearth by means of a scraper-type gate provided with the lower end in contact with the hearth on the hearth moving direction side of the fixed stopper fence of the mining equipment provided at the reduced iron discharge part A method for maintaining a rotary hearth.
JP20558797A 1997-07-31 1997-07-31 Maintainance of rotary furnace hearth in production of reduced iron Pending JPH1150120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20558797A JPH1150120A (en) 1997-07-31 1997-07-31 Maintainance of rotary furnace hearth in production of reduced iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20558797A JPH1150120A (en) 1997-07-31 1997-07-31 Maintainance of rotary furnace hearth in production of reduced iron

Publications (1)

Publication Number Publication Date
JPH1150120A true JPH1150120A (en) 1999-02-23

Family

ID=16509360

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20558797A Pending JPH1150120A (en) 1997-07-31 1997-07-31 Maintainance of rotary furnace hearth in production of reduced iron

Country Status (1)

Country Link
JP (1) JPH1150120A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6241803B1 (en) 1999-01-20 2001-06-05 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Method for manufacturing reduced iron pellets
US6319302B1 (en) 1999-01-18 2001-11-20 Kobe Steel, Ltd. Method for manufacturing reduced iron agglomerates and apparatus there for
JP2010223555A (en) * 2009-03-25 2010-10-07 Nippon Steel Engineering Co Ltd Rotary hearth furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6319302B1 (en) 1999-01-18 2001-11-20 Kobe Steel, Ltd. Method for manufacturing reduced iron agglomerates and apparatus there for
US6241803B1 (en) 1999-01-20 2001-06-05 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Method for manufacturing reduced iron pellets
JP2010223555A (en) * 2009-03-25 2010-10-07 Nippon Steel Engineering Co Ltd Rotary hearth furnace

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