JPH1072627A - Production of sintered ore - Google Patents

Production of sintered ore

Info

Publication number
JPH1072627A
JPH1072627A JP25151996A JP25151996A JPH1072627A JP H1072627 A JPH1072627 A JP H1072627A JP 25151996 A JP25151996 A JP 25151996A JP 25151996 A JP25151996 A JP 25151996A JP H1072627 A JPH1072627 A JP H1072627A
Authority
JP
Japan
Prior art keywords
raw material
ore
bedding
mixing
mixed
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.)
Withdrawn
Application number
JP25151996A
Other languages
Japanese (ja)
Inventor
Toshihide Matsumura
俊秀 松村
Tadashi Matsuo
匡 松尾
Shoken Shimizu
正賢 清水
Suehiro Abe
末広 阿部
Sumio Nakamura
純生 中村
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.)
Kobe Steel Ltd
Original Assignee
Kobe Steel 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 Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP25151996A priority Critical patent/JPH1072627A/en
Publication of JPH1072627A publication Critical patent/JPH1072627A/en
Withdrawn legal-status Critical Current

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  • Manufacture And Refinement Of Metals (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of sintered ore, in which, even in the case of using a large quantity of high crystallized water containing ore as raw material, the permeability of a packing layer is improved and a stable quality sintered ore can be produced under high productivity, by mixing the sintered ore used as a usual bedding ore with a raw material packing layer in a prescribed mixing range. SOLUTION: The range for mixing the bedding ore with the raw material packing layer 13 is such range that the bedding ore in a part or all of the raw material packing layer from the upper surface of the bedding ore layer to 1/2 of the layer thickness of the raw material packing layer. Then, the mixed ratio of the bedding ore is in the range of 2.5-10.0mass% of the whole raw material in terms of the outerpolating percentage. Further, the mixing method of the bedding ore comprises dropping the bedding ore discharged from a bedding ore hopper 1 by a discharging device 4 on the inclining surface formed in the raw material supplying part at the end part of the raw material packing layer 13 from a dropping chute 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、高炉用原料である
焼結鉱の製造技術分野に属するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of manufacturing sinter which is a raw material for a blast furnace.

【0002】[0002]

【従来の技術】高炉原料として用いられる焼結鉱は、一
般には以下のような方法で製造されている。まず、10mm
程度以下の粉鉱石に石灰石等の CaO含有副原料、硅石、
蛇紋岩等のSiO2含有副原料、及びコークスブリーズ等の
固体燃料を混合し、さらにこれに適量の水分を加えて造
粒する。この造粒物をドワイトロイド式焼結機のパレッ
ト上に適切な充填層厚になるように充填し、充填層表層
部の固体燃料に着火する。着火後は、下方から空気を吸
引しながら固体燃料を燃焼させ、その燃焼熱により造粒
物を溶融焼結させて焼結ケーキとする。この焼結ケーキ
は破砕後に粒度調整し、粒径 3mm程度以上の焼結鉱製品
を得る。
2. Description of the Related Art A sintered ore used as a raw material for a blast furnace is generally produced by the following method. First, 10mm
Mineral ore fines or less, CaO-containing auxiliary materials such as limestone, silica,
An SiO 2 -containing auxiliary material such as serpentine and a solid fuel such as coke breeze are mixed, and an appropriate amount of water is added to the mixture to perform granulation. The granulated material is packed on a pallet of a Dwyroid type sintering machine so as to have an appropriate packed bed thickness, and the solid fuel in the surface layer of the packed bed is ignited. After the ignition, the solid fuel is burned while sucking air from below, and the granulated material is melt-sintered by the heat of combustion to form a sintered cake. The size of this sintered cake is adjusted after crushing to obtain a sintered ore product with a particle size of about 3 mm or more.

【0003】ところで、製鉄原料として使用される焼結
鉱の品質は、高炉操業時の荷下がり状態の安定性や通気
性、還元効率等に大きな影響を与えることから、焼結鉱
の強度、被還元性、耐還元粉化性等が厳しく管理されて
いる。また、焼結鉱の製造コストを下げるため、製品歩
留や生産性も重要な管理項目になっている。
[0003] The quality of sinter used as a raw material for ironmaking has a great effect on the stability of the unloading state during operation of the blast furnace, air permeability, reduction efficiency, and the like. Reducing property, reduction powdering resistance, etc. are strictly controlled. Also, in order to reduce the production cost of sinter, product yield and productivity are also important management items.

【0004】[0004]

【発明が解決しようとする課題】焼結鉱の原料として
は、主として赤鉄鉱(Fe2O3: ヘマタイト) や磁鉄鉱(Fe3
O4: マグネタイト) が使用されてきた。しかし、近年の
良質鉱石の産出量の減少にともない、ゲーサイト(Fe2O3
・H2O)を多く含有する、いわゆる高結晶水鉱石の使用量
が次第に増加する傾向にある。この鉱石は多量 (通常 4
質量%程度以上) の結晶水を含有しているのが特徴であ
り、焼結鉱製造用原料として多量に使用すると、結晶水
を除去するために消費熱量が増大するだけでなく、焼成
時の水分の蒸発と固体燃料の燃焼による急激な温度上昇
に伴うガス線速の増加と、多量のカルシウムフェライト
系融液が生成することにより、充填層の通気性が悪化す
ることから製品焼結鉱の強度や歩留、生産性が低下す
る。
The raw materials for sinter are mainly hematite (Fe 2 O 3 : hematite) and magnetite (Fe 3 O 3 ).
O 4 : magnetite) has been used. However, with the recent decrease in the production of high quality ore, goethite (Fe 2 O 3
· H 2 O) containing a large amount of usage of so-called high crystal water ore tends to increase gradually. This ore is large (usually 4
(% By mass or more) is characterized by containing water of crystallization, and when used in large quantities as a raw material for sinter production, not only does heat consumption increase to remove water of crystallization, but also The gas linear velocity increases due to the rapid temperature rise due to the evaporation of water and the combustion of solid fuel, and the generation of a large amount of calcium ferrite-based melt deteriorates the permeability of the packed bed. Strength, yield, and productivity decrease.

【0005】充填層の通気性を改善する方法として、 1
00〜1300℃程度の温度範囲で変形せず、元の形を保って
いる床敷鉱を一定量混合することが考えられる。しか
し、床敷鉱を前もって混合した原料をドワイトロイド式
焼結機のパレット上に充填すると、原料と床敷鉱の粒度
が異なるため、原料充填層末端の原料供給部に形成され
る傾斜面における分級作用により、10〜20mmの粒径をも
つ床敷鉱は充填層最下部に集中する。このため、床敷鉱
を原料に混合しても充填層の通気性改善に寄与すること
ができない。
[0005] As a method for improving the air permeability of the packed layer,
It is conceivable to mix a certain amount of bedding which does not deform in the temperature range of about 00 to 1300 ° C. and keeps its original shape. However, when the raw material premixed with the bedding is filled on the pallet of the Dwyroid type sintering machine, the raw material and the bedding ore have different particle sizes. Due to the classification, bed bedding having a particle size of 10 to 20 mm concentrates at the bottom of the packed bed. For this reason, even if the bedding ore is mixed with the raw material, it cannot contribute to the improvement of the permeability of the packed bed.

【0006】本発明は、上記の問題点を解決するために
なされたもので、原料充填層に通常床敷鉱として用いら
れている焼成後の焼結鉱を所定混合領域に混合すること
により、原料として高結晶水鉱石を多量に使用する場合
でも、充填層の通気性を改善し、安定した品質の焼結鉱
を高い生産性の下で製造することができる焼結鉱の製造
方法を提供することを目的とする。
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises mixing a sintered ore, which is usually used as bedding ore in a raw material packed bed, after firing in a predetermined mixing region, Even if a large amount of highly crystalline water ore is used as a raw material, a method for improving the permeability of the packed bed and providing a method for producing sinter that can produce sinter of stable quality with high productivity is provided. The purpose is to do.

【0007】[0007]

【課題を解決するための手段】その要旨は、高炉用原料
としての焼結鉱を製造するに際し、原料充填層に床敷鉱
を混合することを特徴とする。その混合領域は、床敷鉱
層の上面から原料充填層の層厚の1/2までの原料充填
層の一部または全部に床敷鉱を混合する。そして混合量
は、床敷鉱を外挿で原料全体の 2.5〜10.0質量%の範囲
内で原料充填層に混合する。
The gist of the present invention is that, when producing sintered ore as a raw material for a blast furnace, bedding ore is mixed with the raw material packed bed. In the mixing region, the bedding ore is mixed with a part or the whole of the raw material filling layer from the upper surface of the bedding mineral layer to half the thickness of the raw material filling layer. The mixing amount is such that the bedrock is extrapolated and mixed with the raw material packed bed within a range of 2.5 to 10.0% by mass of the whole raw material.

【0008】床敷鉱の混合方法は、床敷鉱ホッパーから
切出装置で切り出した床敷鉱を、落下シュートから原料
充填層末端の原料供給部に形成される傾斜面に向かっ
て、床敷鉱が落下する傾斜面の法線に対して±30°の
範囲で傾斜する落下シュートから床敷鉱を落下させて床
敷鉱を原料に混合する。
[0008] In the method of mixing bedding ore, a bedding material cut out from a bedding ore hopper by a cutting device is moved from a falling chute to an inclined surface formed in a raw material supply section at the end of a raw material packed bed. The bedding ore is dropped from a falling chute inclined within a range of ± 30 ° with respect to the normal of the inclined surface on which the ore falls, and the bedding ore is mixed with the raw material.

【0009】先に述べたように、焼結鉱を製造する際に
は、粉鉄鉱石に石灰石等の CaO含有副原料、硅石、蛇紋
岩等のSiO2含有副原料、及びコークスブリーズ等の固体
燃料を混合し、さらにこれに適量の水分を加えて造粒し
た物を焼結機のパレット上に適切な一定の充填層厚にな
るように充填し、充填層表層部の固体燃料に着火し、空
気を下方に吸引しながら焼成を行う。従って、焼成時の
充填層の通気性は、焼結鉱の生産性を左右する重要な因
子である。
[0009] As mentioned earlier, when producing a sintered ore, CaO-containing auxiliary raw materials limestone, etc. fine iron ore, Keiseki, SiO 2 content auxiliary materials such as serpentine, and coke breeze of a solid-state The fuel is mixed, and an appropriate amount of water is added thereto.The granulated material is packed on a pallet of a sintering machine so as to have an appropriate constant packed bed thickness, and the solid fuel on the surface of the packed bed is ignited. The baking is performed while sucking air downward. Therefore, the permeability of the packed bed during firing is an important factor that affects the productivity of the sinter.

【0010】焼結反応が進行する過程により充填層は、
湿潤帯、予熱帯(乾燥帯)、赤熱帯(焼結帯)、冷却帯
の四つに分けられるが、中でも予熱帯〜赤熱帯において
通気性は大きく悪化し、焼成全体に大きな影響を与えて
いることが知られている。その理由は、主として、上部
での焼結、燃焼ガスによる水分の蒸発と、固体燃料の燃
焼に伴う急激な温度上昇に伴うガス線速の増加と、予熱
された配合原料に燃焼熱が加わり配合原料が溶融するこ
とによる多量のカルシウムフェライト系融液が生成する
ことに伴う一時的な通気孔の閉塞が原因であると考えら
れる。従って、この領域で十分な通気性を確保すれば、
焼成時の充填層全体の通気性を改善することが可能であ
る。
Due to the progress of the sintering reaction, the packed bed becomes
It is divided into four zones: wet zone, pre-tropical zone (dry zone), red tropic zone (sintered zone), and cooling zone. Is known to be. The main reasons are sintering in the upper part, evaporation of water by combustion gas, increase in gas linear velocity due to rapid temperature rise due to solid fuel combustion, and heat of combustion added to preheated compounded raw material. This is considered to be caused by the temporary blockage of the air holes due to the generation of a large amount of calcium ferrite-based melt due to the melting of the raw material. Therefore, if sufficient air permeability is secured in this area,
It is possible to improve the air permeability of the entire filling layer during firing.

【0011】予熱帯〜赤熱帯において十分な通気孔を確
保する方法としては、予熱帯〜赤熱帯の領域、すなわち
100〜1300℃程度の温度範囲で変形せず、元の形を保っ
ているものを一定量混合する方法が考えられる。発明者
らは、この温度範囲で元の形を保っているものとして、
床敷鉱に着目した。床敷鉱は焼結鉱を製造する際にパレ
ット台車のグレートの保護のために使用しているもので
あり、通常は製品焼結鉱を篩分けして、一部をリターン
して使用している。その粒度範囲は10〜20mmである。
[0011] As a method of securing sufficient ventilation holes in the pre-tropical to red tropical areas, the pre-tropical to red tropical areas, that is,
A method of mixing a certain amount of a material that does not deform in the temperature range of about 100 to 1300 ° C. and maintains its original shape is considered. Assuming that the inventors maintain the original shape in this temperature range,
We focused on bedding. Bedding ore is used to protect the pallet trucks in the production of sinter, and is usually used to screen product sinter and return a portion of it. I have. Its particle size range is 10-20 mm.

【0012】上記の 100〜1300℃程度の温度範囲では、
鉄鉱石と石灰石が反応して低融点(約1200℃)のカルシ
ウムフェライト系融液が生成し、これが周囲に存在する
SiO2やAl2O3 を溶かし込んでいき、多成分系カルシウム
フェライトとなり次第に高融点化していく。従って、床
敷鉱中に存在している多成分系カルシウムフェライトは
既に高融点化しているため、床敷鉱は 100〜1300℃程度
の温度範囲で軟化、溶融することはなく、焼成時、原料
充填層中で通気性を確保することが可能である。
In the above temperature range of about 100 to 1300 ° C.,
Iron ore and limestone react to form a low melting point (about 1200 ° C) calcium ferrite-based melt that exists around
As SiO 2 and Al 2 O 3 are dissolved, the melting point of the multi-component calcium ferrite gradually increases. Therefore, since the multi-component calcium ferrite present in the bedding has already been raised to a high melting point, the bedding does not soften or melt in a temperature range of about 100 to 1300 ° C. It is possible to ensure air permeability in the packed layer.

【0013】床敷鉱を原料充填層に混合する場合、原料
に前もって床敷鉱を混合し、パレット上に充填すると、
原料充填層末端の原料供給部に形成される傾斜面におけ
る分級作用により、10〜20mmの粒径をもつ床敷鉱は充填
層最下部に集中する。このため、本発明では、原料充填
層末端の原料供給部に形成される傾斜面(以下、充填層
の傾斜面という)に向かって、床敷鉱が落下する傾斜面
の法線に対して±30°の範囲で傾斜する落下シュート
から、床敷鉱ホッパーから切り出した床敷鉱を落下させ
て床敷鉱を原料に混合する。
When the bedding ore is mixed with the raw material packed bed, the bedding ore is mixed in advance with the raw material and the mixture is filled on a pallet.
The bedding ore having a particle size of 10 to 20 mm concentrates at the bottom of the packed bed due to the classification action on the inclined surface formed in the raw material supply section at the end of the packed bed. For this reason, in the present invention, the inclination of the bedding ore toward the inclined surface formed in the raw material supply section at the end of the raw material packed layer (hereinafter referred to as the inclined surface of the packed bed) is ± The bedding ore cut from the bedding ore hopper is dropped from the falling chute inclined at an angle of 30 °, and the bedding ore is mixed with the raw material.

【0014】落下シュートから床敷鉱を落下させること
により、床敷鉱は落下シュート上を落下する間に重力加
速度により加速され、充填層の傾斜面に落下した時点
で、充填層の傾斜面に埋没するように落下させる。ま
た、床敷鉱を充填層の傾斜面の法線に対して±30°の
範囲で傾斜する落下シュートから落下させることによ
り、床敷鉱の傾斜面への埋没力は大きくなり、傾斜面に
おける分級作用の影響も小さくなる。このことにより充
填層の傾斜面における分級作用は抑制され、床敷鉱は落
下領域で混合する。
By dropping the bedding from the falling chute, the bedding is accelerated by the gravitational acceleration while falling on the falling chute, and at the time when the bedding falls on the inclined surface of the packed bed, the bedding ore falls on the inclined surface of the packed bed. Drop so that it is buried. In addition, by dropping the bedding ore from the falling chute inclined within a range of ± 30 ° with respect to the normal of the inclined surface of the packed bed, the burial force of the bedding ore on the inclined surface increases, and The effect of the classification action is also reduced. This suppresses the classifying action on the inclined surface of the packed bed, and the bedrock mixes in the falling area.

【0015】ここで、落下シュートの傾斜する範囲を充
填層の傾斜面の法線に対して±30°に限定した理由
は、+30°を超えると、落下する床敷鉱と原料充填時
の傾斜面での原料の流れとの干渉が大きくなり、所定の
混合領域に床敷鉱を混合できなくなり、一方、−30°
を超えると、床敷鉱の傾斜面への埋没力が小さくなるか
らである。なお、法線に対する落下シュートの傾斜角度
は、法線に対して上側を+角度とし、下側を−角度とす
る。
The reason why the range of inclination of the falling chute is limited to ± 30 ° with respect to the normal of the inclined surface of the packed bed is that if it exceeds + 30 °, the falling bedding ore and the inclination at the time of filling the raw material are reduced. Interference with the flow of the raw material on the surface becomes large, and it becomes impossible to mix the bedding ore in the predetermined mixing area.
This is because, when it exceeds, the burial force of the bedding ore on the inclined surface becomes small. In addition, the inclination angle of the falling chute with respect to the normal is defined as a positive angle with respect to the normal and a negative angle with respect to the lower.

【0016】[0016]

【発明の実施の形態】以下に、本発明の実施の形態例に
ついて説明する。
Embodiments of the present invention will be described below.

【0017】[0017]

【実施例】【Example】

実施例1 床敷鉱層の上面から原料充填層の層厚の1/2までの原
料充填層に床敷鉱を外挿で 7.0質量%混合し、焼結鍋を
用いて焼成試験を行った。比較例として、上記の混合し
た床敷鉱に相当する量だけ床敷鉱層の層厚を増加させた
焼成試験も行った。この時の配合原料割合は一般鉱石:
高結晶水鉱石:副原料=50:35:15である。また原料充
填層に混合した床敷鉱の粒度は10〜13mmである。その結
果を表1に示す。
Example 1 Bedding ore was mixed 7.0% by mass by extrapolation to a raw material bed from the upper surface of the bedding layer to 1/2 of the thickness of the raw material bed, and a firing test was performed using a sinter pot. As a comparative example, a firing test was performed in which the thickness of the bedrock layer was increased by an amount corresponding to the mixed bedrock. At this time, the mixing raw material ratio is as follows:
High crystalline water ore: adjunct material = 50:35:15. The bed ore mixed in the raw material packed bed has a particle size of 10 to 13 mm. Table 1 shows the results.

【0018】[0018]

【表1】 [Table 1]

【0019】表1から明らかなように、床敷鉱層の上面
から原料充填層の層厚の1/2までの原料充填層に床敷
鉱を混合することによって、製品落下強度を低下させる
ことなく、焼結鉱の焼成時間は短縮され、生産性(生産
率)は向上している。製品落下強度は下記による。な
お、原料充填層の層厚の1/2を超えて原料充填層に床
敷鉱を混合すると、比較的通気性が良好な部位の通気性
がさらに上昇し、コークスブリーズの燃焼熱が焼結反応
に寄与することなく下部へ伝播してしまい、かえって未
焼成部が増加し、その結果として生産性が低下する。従
って、床敷鉱の混合領域は、原料充填層の層厚の1/2
までに限定した。
As is apparent from Table 1, by mixing the bedding ore into the raw material filling layer from the upper surface of the bedding ore layer to half the thickness of the raw material filling layer, the drop strength of the product can be reduced. In addition, the sintering time of the sinter is reduced, and the productivity (production rate) is improved. The product drop strength is as follows. When bedding is mixed into the raw material packed layer exceeding half the thickness of the raw material packed layer, the permeability of the portion having relatively good air permeability is further increased, and the combustion heat of the coke breathe is sintered. It propagates to the lower part without contributing to the reaction, and instead increases the unsintered part, and as a result, the productivity decreases. Therefore, the mixing area of the bedrock is 1 / of the thickness of the raw material packed bed.
Limited by.

【0020】製品落下強度は製品焼結鉱を2mの高さから
鉄製台上に一度に落下させる操作を4回繰り返した後、
全量を 5mmの篩で篩分けし、下記式を用いて算出する。 落下強度(%)=(篩上の質量/落下試験前の質量)×
100
The product drop strength was determined by repeating the operation of dropping the product sintered ore from a height of 2 m onto an iron table four times,
The whole amount is sieved with a 5 mm sieve and calculated using the following formula. Drop strength (%) = (mass on sieve / mass before drop test) x
100

【0021】実施例2 床敷鉱層の層厚70mm、原料充填層の層厚 330mmで、焼成
試験を行った。混合する床敷鉱は外挿で、床敷鉱層の上
面から原料充填層の層厚 100mmの領域の原料充填層に、
原料全体の 1.0〜15.0質量%の範囲で変化さて混合し
た。さらに原料装入量が一定となるように、混合した床
敷鉱に相当する量だけ床敷鉱層の層厚を増加させた焼結
鍋による焼成試験も行った。この時の配合原料割合及び
原料充填層に混合した床敷鉱の粒度は実施例1と同じで
ある。その結果を図1及び2に示す。
Example 2 A sintering test was performed with a bed bedding layer thickness of 70 mm and a raw material packed layer thickness of 330 mm. The bedding to be mixed is extrapolated from the upper surface of the bedding to the raw material filling layer in the area of 100 mm in thickness of the raw material filling layer.
The mixture was mixed while being changed in the range of 1.0 to 15.0% by mass of the whole raw materials. Further, a firing test was performed using a sinter pot in which the thickness of the bedrock layer was increased by an amount corresponding to the mixed bedrock so that the raw material charge was constant. At this time, the blended raw material ratio and the particle size of the bedding mixed in the raw material packed bed are the same as in Example 1. The results are shown in FIGS.

【0022】図1は原料充填層への床敷鉱混合割合と製
品落下強度との関係を示す図である。図から明らかなよ
うに、床敷鉱混合割合が10.0質量%以下であれば、製品
落下強度には、床敷鉱を混合した場合(図中△)と混合
しない場合(図中○)とでは大きな差は認められず、ほ
ぼ76〜79%の範囲となっている。しかし、床敷鉱混合割
合が10.0質量%を超えると、原料充填層に床敷鉱を混合
することにより、製品落下強度は床敷鉱を混合しない場
合と比較して大きく低下する。従って、床敷鉱の原料充
填層への混合割合は10.0質量%以下が好ましい。
FIG. 1 is a diagram showing the relationship between the mixing ratio of bedding ore to the raw material packed bed and the product drop strength. As is clear from the figure, when the bedding ore mixing ratio is 10.0% by mass or less, the product drop strength is different between when the bedding ore is mixed (△ in the figure) and when it is not mixed (○ in the figure). No significant difference is observed, which is in the range of approximately 76-79%. However, when the bedding ore mixing ratio exceeds 10.0% by mass, by mixing the bedding ore into the raw material packed bed, the product drop strength is greatly reduced as compared with the case where no bedding ore is mixed. Therefore, the mixing ratio of bedding ore to the raw material packed bed is preferably 10.0% by mass or less.

【0023】図2は原料充填層への床敷鉱混合割合と焼
成速度との関係を示す図である。図に示すように、床敷
鉱混合割合が 2.5質量%未満の場合、床敷鉱を混合した
場合と混合しない場合とで、焼成速度に有意な差は認め
られない。しかし、床敷鉱混合割合が 2.5質量%以上に
なると、原料充填層に床敷鉱を混合することにより、焼
成速度が速くなる。これは、原料充填層中の床敷鉱が通
気性を改善しているからである。しかし、上記のよう
に、床敷鉱混合割合が10.0質量%を超えると製品落下強
度が低下するので、床敷鉱を床敷鉱層の上面から原料充
填層の層厚の1/2までの原料充填層に外挿で原料全体
の 2.5〜10.0質量%の範囲内で混合することにより、製
品落下強度を低下させることなく、焼成速度、すなわ
ち、原料充填層の通気性を改善することが可能である。
FIG. 2 is a diagram showing the relationship between the mixing ratio of bedrock ore to the raw material packed bed and the firing rate. As shown in the figure, when the mixing ratio of bedding is less than 2.5% by mass, there is no significant difference in the firing rate between the case where the bedding ore is mixed and the case where the mixing is not performed. However, when the mixing ratio of the bedding ore becomes 2.5% by mass or more, the firing rate is increased by mixing the bedding with the raw material packed bed. This is because the bedrock in the raw material packed bed has improved air permeability. However, as described above, if the mixing ratio of bedding ore exceeds 10.0% by mass, the falling strength of the product decreases. By extrapolating to the packed bed within the range of 2.5 to 10.0% by mass of the entire raw material, it is possible to improve the firing rate, that is, the gas permeability of the packed bed, without lowering the product drop strength. is there.

【0024】実施例3 図3は床敷鉱の混合装置の説明図で、混合装置は床敷鉱
ホッパー1からパレット台車のグレート保護のためにパ
レット上に敷く通常の床敷鉱の供給ライン2から分岐し
た供給ライン3の先端に切出装置4を設け、この切出装
置4の前方に落下シュート5を設けている。供給ライン
2の下端部には、グレート保護のためにパレット上に床
敷鉱を敷くフィーダ6が設けてある。また、床敷鉱の混
合装置に対向して、原料ホッパー7と原料シュート8と
を備えた原料充填装置が設けてある。
Embodiment 3 FIG. 3 is an explanatory view of a bedding ore mixing apparatus. The mixing apparatus is an ordinary bedding ore supply line 2 laid on a pallet from a bedding ore hopper 1 to protect a pallet truck from greatness. A cutting device 4 is provided at the tip of a supply line 3 branched from the device, and a drop chute 5 is provided in front of the cutting device 4. At the lower end of the supply line 2, a feeder 6 for laying bedding on pallets for great protection is provided. Further, a raw material filling device provided with a raw material hopper 7 and a raw material chute 8 is provided so as to face the bedding ore mixing device.

【0025】切出装置4の出口には、ゲート幅を調節す
ることによって、原料充填層への床敷鉱の混合領域をパ
レット幅方向に調節できるゲート(図示せず)を設けて
いる。落下シュート5の幅はパレット幅に合わせてあ
り、落下シュート5の角度を調節することによって、原
料充填層への床敷鉱の層厚方向の混合領域を調節するこ
とができる。床敷鉱を混合する際は、図3に示すよう
に、原料シュート8から充填される原料充填層13の傾斜
面に向かって、床敷鉱が落下する傾斜面の法線に対して
±30°の範囲で傾斜する落下シュート5から混合され
る床敷鉱9を落下させ充填層の傾斜面に埋没させる。混
合された床敷鉱10は、分級されることなく埋没した位置
に止まり、所定の混合領域に分布する。
A gate (not shown) is provided at the outlet of the cutting device 4 so that the mixing area of the bedrock to the raw material packed bed can be adjusted in the pallet width direction by adjusting the gate width. The width of the drop chute 5 is adjusted to the pallet width, and by adjusting the angle of the drop chute 5, the mixing area of the bedding ore to the raw material packed bed in the thickness direction can be adjusted. When mixing the bedding ore, as shown in FIG. 3, the raw material chute 8 is moved toward the inclined surface of the raw material packed layer 13 to be filled by ± 30 with respect to the normal of the inclined surface where the bedding ore falls. The bedding ore 9 to be mixed is dropped from the falling chute 5 inclined in the range of ° and buried in the inclined surface of the packed bed. The mixed bedding 10 stops at the buried position without being classified and is distributed in a predetermined mixing region.

【0026】本発明例では原料充填層の層厚を 600mmと
し、充填層の底部から 300mmの領域に床敷鉱を混合し
た。床敷鉱の混合割合は原料全体の 4質量%である。ま
た、床敷鉱の粒度は10〜20mmである。なお、床敷鉱層の
層厚は40mmである。切出装置4はパレットの上方2.5mの
位置に設置し、切出装置4には電磁フィーダを用いた。
混合量(落下シュート5への供給量)の調節は電磁フィ
ーダの振動数を調節することによって行った。床敷鉱を
通気性の悪いパレット幅方向中央部に多く混合するため
に、ゲートはパレット幅方向中央部に、パレット幅に対
して50%の開度とした。また、落下シュートの角度は+
10°とした。
In the example of the present invention, the thickness of the raw material packed bed was set to 600 mm, and the bedrock was mixed in a region 300 mm from the bottom of the packed bed. The mixing ratio of bedding is 4% by mass of the whole raw material. In addition, the particle size of the bedding ore is 10 to 20 mm. The thickness of the bedding layer is 40 mm. The cutting device 4 was installed at a position 2.5 m above the pallet, and an electromagnetic feeder was used for the cutting device 4.
The mixing amount (the amount supplied to the drop chute 5) was adjusted by adjusting the frequency of the electromagnetic feeder. In order to mix a large amount of bedding in the center of the pallet with poor air permeability, the gate was set at 50% of the pallet width at the center of the pallet. The angle of the falling chute is +
10 °.

【0027】上記の条件で、床敷鉱を原料充填層に混合
しときのパレット幅方向の床敷鉱の混合割合を図4に示
す。また、比較例として、前もって床敷鉱を混合した原
料を充填層の全領域に充填したときのパレット幅方向の
床敷鉱の混合割合を図5に示す。なお、比較例の床敷鉱
の混合割合も原料全体の 4質量%である。また、本発明
例と比較例の焼成結果を図6に示す。
FIG. 4 shows the mixing ratio of the bedding in the pallet width direction when the bedding is mixed with the raw material packed bed under the above conditions. Also, as a comparative example, FIG. 5 shows the mixing ratio of the bedding ore in the pallet width direction when the raw material in which the bedding ore was previously mixed was filled in the entire region of the packed bed. The mixing ratio of the bedding ore of the comparative example was 4% by mass of the whole raw material. FIG. 6 shows the firing results of the present invention example and the comparative example.

【0028】図4に示すように、本発明例では、床敷鉱
は充填層の層厚 300mm以下の部分に3〜8 質量%の範囲
で混合され、パレット幅方向中央部は目的通り、両端よ
りも多く、 6〜8 質量%の範囲で混合されている。この
ため、焼成時の原料充填層の通気性は改善され、図6に
示すように、焼成速度、鍋歩留とも比較例に対して向上
している。しかし、比較例は図5に示すように、床敷鉱
は原料充填時の分級作用により層厚 200mm以下に集中
し、層厚の全領域には分布していない。その結果、比較
例は床敷鉱の混合による焼成時の原料充填層の通気性の
改善は行われず、図6に示すように、焼成速度、鍋歩留
とも本発明例より劣っている。
As shown in FIG. 4, in the example of the present invention, the bedding ore is mixed with a portion of the packed bed having a thickness of 300 mm or less in the range of 3 to 8% by mass, and the central portion in the pallet width direction is as intended, and the both ends are mixed. More than 6 to 8% by mass. For this reason, the gas permeability of the raw material filling layer at the time of firing is improved, and as shown in FIG. 6, both the firing speed and the pot yield are improved with respect to the comparative example. However, in the comparative example, as shown in FIG. 5, the bedding ore is concentrated to a layer thickness of 200 mm or less due to the classifying action at the time of material filling, and is not distributed in the entire region of the layer thickness. As a result, in the comparative example, the air permeability of the raw material packed layer at the time of firing by mixing the bedding ore was not improved, and as shown in FIG. 6, both the firing speed and the pot yield were inferior to those of the present invention.

【0029】[0029]

【発明の効果】以上述べたところから明らかなように、
本発明によれば、床敷鉱を原料充填層の所定混合領域に
混合し、焼成中の原料充填層の通気性の悪化を抑制して
いるため、安定した品質の焼結鉱を高い生産性の下で製
造することが可能である。
As is apparent from the above description,
According to the present invention, bedding ore is mixed in a predetermined mixing region of the raw material packed bed to suppress deterioration of the gas permeability of the raw material packed bed during firing, so that sinter of stable quality can be produced with high productivity. It is possible to manufacture under

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

【図1】原料充填層への床敷鉱混合割合と製品落下強度
との関係を示す図である。
FIG. 1 is a diagram showing the relationship between the mixing ratio of bedding ore to a raw material packed bed and the product drop strength.

【図2】原料充填層への床敷鉱混合割合と焼成速度との
関係を示す図である。
FIG. 2 is a view showing a relationship between a mixing ratio of bedding ore to a raw material packed bed and a firing rate.

【図3】床敷鉱の混合装置の説明図である。FIG. 3 is an explanatory view of a mixing device for bedrock ore.

【図4】本発明例における床敷鉱の混合領域における床
敷鉱の混合状態を示す図である。
FIG. 4 is a diagram showing a mixed state of bedding ore in a mixed area of bedding in the example of the present invention.

【図5】比較例における床敷鉱の混合領域における床敷
鉱の混合状態を示す図である。
FIG. 5 is a diagram showing a mixed state of bedding in a mixed area of bedding in a comparative example.

【図6】実施例3における焼成結果を示す図である。FIG. 6 is a view showing a firing result in Example 3.

【符号の説明】[Explanation of symbols]

1…床敷鉱ホッパー、2…供給ライン、3…供給ライ
ン、4…切出装置、5…落下シュート、6…フィーダ、
7…原料ホッパー、8…原料シュート、9…混合される
床敷鉱、10…混合された床敷鉱、11…グレート保護の床
敷鉱、12…原料、13…原料充填層。
DESCRIPTION OF SYMBOLS 1 ... Bedding ore hopper, 2 ... Supply line, 3 ... Supply line, 4 ... Cutting device, 5 ... Drop chute, 6 ... Feeder,
7 ... raw material hopper, 8 ... raw material chute, 9 ... mixed bedding, 10 ... mixed bedding, 11 ... great protection bedding, 12 ... raw material, 13 ... raw material packed bed.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 阿部 末広 兵庫県神戸市灘区灘浜東町2番地 株式会 社神戸製鋼所神戸製鉄所内 (72)発明者 中村 純生 兵庫県神戸市灘区灘浜東町2番地 株式会 社神戸製鋼所神戸製鉄所内 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Suehiro Abe 2 Nadahama-machi, Nada-ku, Kobe City, Hyogo Prefecture Inside the Kobe Steel Works Kobe Works (72) Inventor Sumio Nakamura 2 Nadahama-Higashi-cho, Nada-ku, Kobe City, Hyogo Prefecture Kobe Steel, Ltd.Kobe Steel, Ltd.

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 高炉用原料としての焼結鉱を製造するに
際し、原料充填層に床敷鉱を混合することを特徴とする
焼結鉱の製造方法。
1. A method for producing sintered ore, which comprises mixing bedrock ore in a raw material packed bed when producing sintered ore as a raw material for a blast furnace.
【請求項2】 床敷鉱層の上面から原料充填層の層厚の
1/2までの原料充填層の一部または全部に床敷鉱を混
合する請求項1記載の焼結鉱の製造方法。
2. The method for producing a sintered ore according to claim 1, wherein the bedding ore is mixed with a part or the whole of the raw material filling layer from the upper surface of the bedding ore layer to half the thickness of the raw material filling layer.
【請求項3】 床敷鉱を外挿で原料全体の 2.5〜10.0質
量%の範囲内で原料充填層に混合する請求項1または2
記載の焼結鉱の製造方法。
3. The bedbed ore is extrapolated and mixed with the raw material packed bed within a range of 2.5 to 10.0% by mass of the whole raw material.
The method for producing a sintered ore according to the above.
【請求項4】 ドワイトロイド式焼結機のパレット上に
充填する原料充填層末端の原料供給部に形成される傾斜
面に向かって、床敷鉱が落下する傾斜面の法線に対して
±30°の範囲で傾斜する落下シュートから床敷鉱を落
下させて床敷鉱を原料に混合することを特徴とする床敷
鉱の混合方法。
4. A normal to the inclined surface on which the bedding ore falls is directed toward an inclined surface formed in a raw material supply section at an end of a raw material packed layer to be filled on a pallet of a Dwyroid type sintering machine. A method of mixing bedding ore, wherein the bedding is dropped from a falling chute inclined at an angle of 30 ° and the bedding is mixed with the raw material.
【請求項5】 床敷鉱ホッパーから原料充填層に混合す
る床敷鉱を定量切り出す切出装置と、切り出した床敷鉱
を原料供給部に形成される傾斜面に向かって落下させ
る、床敷鉱が落下する傾斜面の法線に対して±30°の
範囲で傾斜する落下シュートとを備えたことを特徴とす
る床敷鉱の混合装置。
5. A cutting device for quantitatively cutting out a bedding ore to be mixed into a raw material packed bed from a bedding ore hopper, and a bedding for dropping the cut out bedding toward an inclined surface formed in a raw material supply unit. A bedding ore mixing apparatus, comprising: a falling chute inclined within a range of ± 30 ° with respect to a normal to an inclined surface on which the ore falls.
JP25151996A 1996-07-02 1996-09-24 Production of sintered ore Withdrawn JPH1072627A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25151996A JPH1072627A (en) 1996-07-02 1996-09-24 Production of sintered ore

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP17232396 1996-07-02
JP8-172323 1996-07-02
JP25151996A JPH1072627A (en) 1996-07-02 1996-09-24 Production of sintered ore

Publications (1)

Publication Number Publication Date
JPH1072627A true JPH1072627A (en) 1998-03-17

Family

ID=26494718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25151996A Withdrawn JPH1072627A (en) 1996-07-02 1996-09-24 Production of sintered ore

Country Status (1)

Country Link
JP (1) JPH1072627A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100937460B1 (en) 2008-03-28 2010-01-19 주식회사 포스코 Apparatus for charging the upper sintered ore

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100937460B1 (en) 2008-03-28 2010-01-19 주식회사 포스코 Apparatus for charging the upper sintered ore

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