JP3344151B2 - Sinter production method - Google Patents
Sinter production methodInfo
- Publication number
- JP3344151B2 JP3344151B2 JP09593295A JP9593295A JP3344151B2 JP 3344151 B2 JP3344151 B2 JP 3344151B2 JP 09593295 A JP09593295 A JP 09593295A JP 9593295 A JP9593295 A JP 9593295A JP 3344151 B2 JP3344151 B2 JP 3344151B2
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- Japan
- Prior art keywords
- ore
- sintering
- particles
- weight
- sintered
- Prior art date
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- Expired - Fee Related
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えばピソライト鉱石
などの高結晶水含有鉱石を原料鉱石として多量に使用す
る焼結鉱の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sintered ore using a large amount of ore containing high crystal water such as a pisolite ore as a raw material ore.
【０００２】[0002]
【従来の技術】焼結鉱の原料として、従来、赤鉄鉱（ヘ
マタイト）や磁鉄鉱（マグネタイト）の良質な鉱石を使
用していたが、近年ゲーサイト（Ｆｅ2 Ｏ3 ・Ｈ2 Ｏ）
を多く含むピソライト鉱石（魚卵状の組織を有する）の
使用量が増加してきている。このピソライト鉱石は焼結
の生産性を維持する上で問題が多く、これに対応する技
術開発が望まれている。2. Description of the Related Art Conventionally, high-quality ores such as hematite (hematite) and magnetite (magnetite) have been used as raw materials for sinter, but in recent years goethite (Fe 2 O 3 .H 2 O)
The use of pisolite ore (having a fish-egg-like structure) containing a large amount of is increasing. This pisolite ore has many problems in maintaining the productivity of sintering, and technical development corresponding to this is desired.
【０００３】ピソライト鉱石は４％以上の結晶水を含有
しており、３００℃で結晶水を解離したピソライト鉱石
は多孔質となる。このため、１２００℃以上の焼結過程
において、多孔質なピソライト鉱石は通常の鉱石と比較
してフラックスと反応しやすく、過剰の融液を生成す
る。この過剰の融液が焼結層の通気を悪化させ、生産性
を低下させることが報告されている。[0003] Pisolite ore contains 4% or more of crystallization water, and the pisolite ore from which crystallization water is dissociated at 300 ° C becomes porous. For this reason, in the sintering process at 1200 ° C. or higher, the porous pisolite ore is more apt to react with the flux than the ordinary ore, and generates an excess melt. It has been reported that this excess melt deteriorates the ventilation of the sintered layer and lowers productivity.
【０００４】そこで、このような問題に対応する技術と
して、粗粒高ゲーサイト鉱石の周囲に蛇紋岩などの含Ｍ
ｇＯ−ＳｉＯ２副原料粉からなる被覆層を形成した後、
焼結する方法が提案されている（特公平５−８３６２０
号公報）。これによって、焼結過程で１２００℃以上に
なった時、カルシウムフェライト融液が高ゲーサイト鉱
石と接触する前に、高ゲーサイト鉱石の緻密化が進行す
ると報告されている。Therefore, as a technique for addressing such a problem, there is a technique of forming M-bearing rocks such as serpentinite around coarse-grained high-gaesite ore.
After forming a coating layer composed of gO-SiO2 auxiliary raw material powder,
A sintering method has been proposed (Japanese Patent Publication No. 5-83620).
No.). Accordingly, it is reported that when the temperature becomes 1200 ° C. or higher during the sintering process, the calcium ferrite melt contacts the high goethite ore, and the densification of the high goethite ore proceeds.
【０００５】また、特開平５−３３９６５２号公報で
は、粗粒のピソライト鉱石の表面にＣａＯ分の一部を付
着させた後、残りのＣａＯ分、ピソライト粉鉱石および
他の粉鉱石とを付着させた２層の付着層からなる擬似粒
子を焼結する方法が考案されている。これによれば、２
層の付着層のＣａＯ分の割合を所定の割合にすることで
融液の生成量を適正化している。In Japanese Patent Application Laid-Open No. 5-339652, after a portion of CaO is adhered to the surface of coarse-grained pisolite ore, the remaining CaO, pisolite fine ore and other fine ore are adhered. A method of sintering pseudo particles composed of two adhesion layers has been devised. According to this, 2
By setting the proportion of CaO in the adhesion layer of the layer to a predetermined proportion, the amount of generated melt is optimized.
【０００６】[0006]
【発明が解決しようとする課題】前述したように、ピソ
ライト鉱石を配合し焼結した場合、過剰の融液生成によ
って焼結層の通気性悪化を引き起こし、生産性を低下さ
せる。As described above, when pisolite ore is blended and sintered, excessive melt generation causes deterioration in air permeability of the sintered layer and lowers productivity.
【０００７】この問題を解決するために、前述の特公平
５−８３６２０号公報に開示された技術では粗粒高ゲー
サイト鉱石の周囲に蛇紋岩などの含ＭｇＯ−ＳｉＯ２副
原料粉からなる被覆層を形成した後、焼結するが、蛇紋
岩の添加によって成品焼結鉱中のＳｉＯ2 量が増加し、
高炉におけるスラグ処理コストが増加する。In order to solve this problem, the technique disclosed in the above-mentioned Japanese Patent Publication No. 5-83620 discloses a coating layer made of MgO-SiO2 secondary raw material powder such as serpentine around a coarse-grained high-gaesite ore. After the formation of sintering, the addition of serpentine increases the amount of SiO 2 in the product sinter,
The slag processing cost in the blast furnace increases.
【０００８】また、融液の生成量を制御するために、前
述の特開平５−３３９６５２号公報に開示された技術で
は２層の付着層からなる擬似粒子を焼結するが、この方
法ではピソライト鉱石を微粉と粗粒とに分けるプロセス
が必要である。また、この方法では被覆用鉱石に易溶融
性のピソライト鉱石を使用しているために、融液生成を
制御するためには多量のピソライト微粉鉱石を確保しな
くてはならない。In order to control the amount of melt produced, pseudo-particles consisting of two adhered layers are sintered by the technique disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 5-339652. A process is needed to separate the ore into fines and coarses. Further, in this method, since an easily meltable pisolite ore is used as the coating ore, a large amount of pisolite fine ore must be secured in order to control the generation of the melt.
【０００９】本発明は、かかる事情に鑑みてなされたも
のであって、ピソライト鉱石などの高結晶水含有鉱石を
原料鉱石として多量に使用した場合に、低コストでしか
も困難性を伴わずに高生産性を維持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。[0009] The present invention has been made in view of the above circumstances, and when a large amount of ore containing high crystal water such as pisolite ore is used as a raw material ore, the cost is low and the cost is high. An object of the present invention is to provide a method for producing a sintered ore that can maintain productivity.
【００１０】[0010]
【課題を解決するための手段および作用】本発明は、上
記課題を解決するために、高結晶水含有鉱石を原料鉱石
として使用する焼結鉱の製造方法であって、高結晶水含
有鉱石と含ＣａＯ副原料とを主体とする粒子の表層に、
粒径０．２５ｍｍ以下の粒子を８０重量％以上含有する
難溶融性鉱石と固体燃料とを主体とする被覆層を形成し
て擬似粒子を作成し、この擬似粒子を焼結することを特
徴とする焼結鉱の製造方法を提供する。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method for producing a sintered ore using a high crystal water content ore as a raw material ore. On the surface layer of particles mainly composed of CaO-containing auxiliary materials,
Forming pseudo-particles by forming a coating layer mainly composed of a hard-to-melt ore containing particles having a particle size of 0.25 mm or less and 80 wt% or more and a solid fuel; and sintering the pseudo particles. To provide a method for producing a sintered ore.
【００１１】以下、本発明について詳細に説明する。Hereinafter, the present invention will be described in detail.
【００１２】本発明は、原料鉱石として高結晶水含有鉱
石、例えばピソライト鉱石を用い、その中の微粒のもの
は積極的に反応させるが、粗粒のものは緻密化して残留
元鉱として残存させるという思想に基づいている。すな
わち、本発明では、高結晶水含有鉱石と含ＣａＯ副原料
とを主体とする粒子の表層に微粉の難溶融性鉱石と固体
燃料とを主体とする被覆層を形成することによって擬似
粒子を形成し、この被覆層が高結晶水含有鉱石のうち微
粒のものの過度の溶融を抑制するとともに、粗粒に対す
る融液の侵入を抑制して粗粒の緻密化を促し、もって適
度な融液を確保するものである。In the present invention, an ore containing high crystal water, such as a pisolite ore, is used as a raw material ore, and fine ores therein are positively reacted, while coarse ores are densified and left as a residual ore. It is based on the idea. That is, in the present invention, pseudo particles are formed by forming a coating layer mainly composed of a hardly meltable ore of fine powder and a solid fuel on the surface layer of particles mainly composed of a high crystalline water-containing ore and a CaO-containing auxiliary material. In addition, this coating layer suppresses excessive melting of fine particles in the high crystal water content ore, suppresses penetration of the melt into the coarse particles, and promotes densification of the coarse particles, thereby securing an appropriate melt. Is what you do.
【００１３】本発明における擬似粒子は図１に示すよう
な構造を有している。ここで高結晶水含有鉱石、例えば
ピソライト鉱石は、微粒および粗粒の鉱石から構成され
ているので、図１の（ａ），（ｂ）２種類の擬似粒子の
形態が考えられる。図１の（ａ）は微粒の高結晶水鉱石
と含ＣａＯ副原料とからなる集合粒子１の表層に、微粉
の難溶融性鉱石と固体燃料からなる被覆層２を形成した
擬似粒子であり、図１の（ｂ）は粗粒の高結晶水鉱石３
に含ＣａＯ副原料４が付着した粒子の表層に、微粉の難
溶融性鉱石と固体燃料からなる被覆層５を被覆した擬似
粒子である。ここで、高結晶水含有鉱石が微粒であるか
粗粒であるかの粒径の目安はおよそ１ｍｍである。The pseudo particles of the present invention have a structure as shown in FIG. Here, the ore containing high crystal water, for example, the pisolite ore is composed of fine and coarse ores, and thus two types of pseudo-particles shown in FIGS. 1A and 1B can be considered. FIG. 1A is a pseudo particle in which a coating layer 2 made of a finely powdered ore and a solid fuel is formed on a surface layer of an aggregated particle 1 made of a fine high crystal water ore and a CaO-containing auxiliary material, FIG. 1 (b) shows a coarse-grained high crystal water ore 3
Is a pseudo particle in which a surface layer of particles having CaO-containing auxiliary material 4 attached thereto is coated with a coating layer 5 made of finely powdered hardly meltable ore and solid fuel. Here, the standard of the particle diameter of whether the high crystal water content ore is fine or coarse is about 1 mm.
【００１４】図１（ａ）のような微粒の高結晶水鉱石
（例えばピソライト鉱石）を含む擬似粒子を焼結した場
合、３００℃で高結晶水鉱石中の結晶水が解離し多孔質
になる。さらに、擬似粒子表層部の固体燃料の燃焼と微
粉の難溶融性鉱石の酸化が進行し、このとき発生する熱
によってさらに高温となる。そして１２００℃以上にな
ると、擬似粒子内部で多孔質な高結晶水鉱石と副原料と
の反応によって多量の融液を生成する。このとき融液は
擬似粒子の外部へと流れ出そうとするが、表層に形成さ
れた微粉の難溶融性鉱石を含む被覆層２によって抑制さ
れる。つまり、従来と異なり融液が多量に生成しても融
液が擬似粒子の内部に閉じこめる作用が働くために焼結
層の通気性の悪化を抑制することができる。When pseudo particles containing fine high-crystal water ore (for example, pisolite ore) as shown in FIG. 1A are sintered, water of crystallization in the high-crystal water ore dissociates at 300 ° C. to become porous. . Further, the combustion of the solid fuel on the surface layer of the pseudo particles and the oxidation of the hard-to-melt ore of the fine powder progress, and the heat generated at this time further raises the temperature. When the temperature reaches 1200 ° C. or higher, a large amount of melt is generated by the reaction between the porous high-crystalline water ore and the auxiliary material inside the pseudo particles. At this time, the melt tends to flow out of the pseudo-particles, but is suppressed by the coating layer 2 containing the finely powdered hard-to-melt ore formed on the surface layer. That is, unlike the conventional case, even if a large amount of the melt is generated, the melt acts to confine the inside of the pseudo particles, so that the deterioration of the permeability of the sintered layer can be suppressed.
【００１５】一方、図１（ｂ）のような粗粒の高結晶水
鉱石（例えばピソライト鉱石）を含む擬似粒子を焼結し
た場合、３００℃で高結晶水鉱石中の結晶水が解離し多
孔質になる。そして、擬似粒子の被覆層５の固体燃料の
燃焼と微粉の難溶融性鉱石の酸化によって熱が発生し、
さらに高温となる。１２００℃以上で粗粒の高結晶水鉱
石３と付着した副原料４とが反応するが、付着した副原
料が少ないために大部分が反応しないで残る。さらに１
３００℃以上になると多孔質な高結晶水鉱石の緻密化が
進行し、強度が回復する。この際、高結晶水鉱石の表層
に形成した微粉の難溶融性鉱石を含む被覆層５は外部か
ら融液が進入してくるのを抑制する効果がある。On the other hand, when sintering pseudo particles containing coarse-grained high-crystal water ore (for example, pisolite ore) as shown in FIG. 1B, the crystal water in the high-crystal water ore dissociates at 300 ° C. Be quality. Then, heat is generated by combustion of the solid fuel in the coating layer 5 of the pseudo particles and oxidation of the hard-to-melt ore of the fine powder,
It is even hotter. At 1200 ° C. or higher, the coarse-grained high-crystal water ore 3 reacts with the attached auxiliary material 4, but most remain without reaction because the amount of attached auxiliary material is small. One more
At 300 ° C. or higher, the densification of the porous high-crystal water ore proceeds, and the strength is recovered. At this time, the coating layer 5 containing the finely powdered hard-to-melt ore formed on the surface layer of the highly crystalline water ore has an effect of suppressing the intrusion of the melt from the outside.
【００１６】なお、図１は擬似粒子の構造をわかりやす
く説明するために、高結晶水含有鉱石の微粒と粗粒の典
型例を示した。粗粒の構造を説明する図１（ｂ）では、
１個の粒子の表面に含ＣａＯ副原料を付着させた状態を
示した。FIG. 1 shows typical examples of fine grains and coarse grains of the ore containing high crystal water in order to explain the structure of the pseudo-particles in an easy-to-understand manner. In FIG. 1B illustrating the structure of the coarse particles,
The state where the CaO-containing auxiliary material was attached to the surface of one particle was shown.
【００１７】本発明では被覆層として微粉の難溶融性鉱
石と固体燃料とを用いる。被覆層に難溶融性鉱石を用い
た理由は、被覆層の上述の機能を有効に発揮させるため
である。また固体燃料を擬似粒子の表層部に被覆した理
由は、固体燃料の燃焼速度を高めるためである。これに
より固体燃料は、高結晶水含有鉱石の結晶水を効率的に
解離し、多孔質化した高結晶水含有鉱石を早期に緻密化
する役割を果たす。なお、固体燃料はこのように被覆層
に含有されるが、焼結性を高める観点からその一部を補
助的に内層に含有させてもよい。In the present invention, a finely powdered hardly meltable ore and a solid fuel are used as the coating layer. The reason why the hardly fusible ore was used for the coating layer is to effectively exert the above-described function of the coating layer. The reason why the solid fuel is coated on the surface layer of the pseudo particles is to increase the burning speed of the solid fuel. This allows the solid fuel to efficiently dissociate the water of crystallization of the ore with high crystal water content and play a role in early densification of the ore with high crystal water content. The solid fuel is contained in the coating layer as described above, but a part of the solid fuel may be additionally contained in the inner layer from the viewpoint of improving sinterability.
【００１８】被覆層に用いる難溶融性鉱石は、擬似粒子
への付着性が必要であるため、粒径０．２５ｍｍ以下の
粒子を８０重量％以上含有する微粉のものであることが
必要である。Since the hardly meltable ore used in the coating layer needs to adhere to pseudo particles, it must be a fine powder containing 80% by weight or more of particles having a particle size of 0.25 mm or less. .
【００１９】被覆層に用いる微粉の難溶融性鉱石として
は、ＦｅＯを１０重量％以上含む鉱石を用いることが好
ましい。このような鉱石としてはマグネタイトを含むマ
グネタイト系微粉鉱石が挙げられる。このマグネタイト
系微粉鉱石に代表されるＦｅＯを１０重量％以上含む鉱
石は、焼結の際の昇温過程においてＦｅ3 Ｏ4 からＦｅ
2 Ｏ3 へ結晶構造が変化し、結晶構造の再配列が起こ
る。このとき、被覆層の微粉鉱石間は一部焼結反応によ
り結合し、被覆の効果を高める。また、マグネタイトの
酸化熱は焼結を促進させる効果もある。ここで、ＦｅＯ
を１０重量％以上としたのはこれ以下では結晶構造の再
配列による被覆効果を高める機能が不十分になるからで
ある。It is preferable to use an ore containing 10% by weight or more of FeO as the hard-melting ore of the fine powder used for the coating layer. Examples of such ores include magnetite-based fine ores including magnetite. The ore containing 10% by weight or more of FeO typified by the magnetite-based fine ore is changed from Fe 3 O 4 to Fe in a heating process during sintering.
The crystal structure changes to 2 O 3 and rearrangement of the crystal structure occurs. At this time, the fine ores in the coating layer are partially bonded by a sintering reaction to enhance the effect of the coating. The heat of oxidation of magnetite also has the effect of promoting sintering. Here, FeO
Is set to 10% by weight or more because a function of enhancing the coating effect by rearrangement of the crystal structure becomes insufficient below this value.
【００２０】マグネタイト系鉱石に代表される、ＦｅＯ
を１０重量％以上含有する難溶融性鉱石の配合割合は原
料鉱石全体の３〜３０重量％であることが好ましい。そ
の理由は、微粉鉱石の被覆量が３重量％未満では擬似粒
子の外側に融液が流れ出すのを抑制する効果が小さく、
逆に３０重量％を超えると擬似粒子の外側に流れ出す融
液がなくなるために擬似粒子間の結合に必要な融液が不
足し、焼結鉱の歩留が低下するからである。FeO represented by magnetite ore
Is preferably 3 to 30% by weight of the whole raw material ore. The reason is that if the coating amount of the fine ore is less than 3% by weight, the effect of suppressing the melt from flowing out of the pseudo particles is small,
Conversely, if the content exceeds 30% by weight, no melt flows out of the pseudo particles, so that the melt required for bonding between the pseudo particles is insufficient, and the yield of the sintered ore decreases.
【００２１】本発明において被覆層に用いる微粉の難溶
融性鉱石としては、上記のものの他、ＴｉＯ2 を４重量
％以上含む鉱石も好適に用いることができる。このよう
な鉱石としては、砂鉄およびイルメナイト（ＦｅＴｉＯ
3 ）を挙げることができる。このようにＴｉＯ2 を４重
量％以上含む鉱石は、ＴｉＯ2 の作用によって、擬似粒
子内部で生成した融液との反応性が小さいため、その配
合割合が低くても十分に被覆層の被覆効果を発揮させる
ことができる。具体的には、その原料鉱石全体に対する
配合割合が１重量％から融液の流れ出しを抑制する効果
が現れ、１０重量％を超えると被覆粒子間の結合に必要
な融液が不足し、歩留低下を引き起こす。従って、この
場合には、難溶融性鉱石の原料鉱石全体に対する配合割
合が１〜１０重量％であることが必要である。なお、例
示した砂鉄およびイルメナイトは、いずれもＦｅＯを１
０重量％以上含有しており、上述したマグネタイト系微
粉鉱石と同様の機能をも果たすものである。In the present invention, as the finely powdered hard-to-melt ore used for the coating layer, an ore containing 4% by weight or more of TiO 2 can be suitably used in addition to the above. Such ores include iron sand and ilmenite (FeTiO.sub.3).
3 ) can be mentioned. Thus ores containing TiO 2 4 wt% or more, by the action of TiO 2, for reactivity with the melt generated inside the pseudo particles is small, the coating effect of sufficiently cover layer be the mixing ratio is low Can be demonstrated. More specifically, the mixing ratio of the raw material ore to 1% by weight has the effect of suppressing the flow of the melt, and if it exceeds 10% by weight, the melt required for bonding between the coated particles is insufficient, and the yield is reduced. Causes decline. Therefore, in this case, the compounding ratio of the hardly meltable ore to the whole raw material ore needs to be 1 to 10% by weight. Note that the iron sand and ilmenite exemplified above each contained 1 FeO.
It is contained in an amount of 0% by weight or more and has the same function as the above-mentioned magnetite-based fine ore.
【００２２】本発明において、高結晶水含有鉱石はおよ
そ４重量％以上の結晶水を含有しているものを指す。ま
た、高結晶水含有鉱石の原料鉱石全体に対する配合割合
はおよそ２０重量％以上である。結晶水が４重量％未満
であるか、または４重量％以上であってもその配合割合
が２０重量％未満であれば焼結の際の生産性低下の問題
が生じない。In the present invention, the ore containing high crystallization water refers to an ore containing about 4% by weight or more of crystallization water. The compounding ratio of the high crystal water content ore to the entire raw material ore is about 20% by weight or more. Even if the amount of crystallization water is less than 4% by weight or 4% by weight or more, if the compounding ratio is less than 20% by weight, there is no problem of a decrease in productivity during sintering.
【００２３】前記固体燃料としては、コークス、無煙
炭、チャー、廃プラスチック等を用いることができ、こ
れら単独でも混合して用いてもよい。この中ではコーク
スが好適である。個体燃料の粒度は特に問わないが、被
覆効果を高めるためには３ｍｍ以下であることが好まし
い。As the solid fuel, coke, anthracite, char, waste plastic and the like can be used, and these may be used alone or in combination. Among them, coke is preferred. The particle size of the solid fuel is not particularly limited, but is preferably 3 mm or less in order to enhance the covering effect.
【００２４】実際の焼結に際しては、上述のような擬似
粒子構造を持つ原料を、焼結機パレット上に装入して焼
結層（焼結ベッド）を形成し、そこにコークス炉ガスな
どを供給して点火し焼結を行う。ここで焼結層上下方向
で固体燃料量が偏析するように装入すると更なる改善の
効果が表れる。具体的には、熱量不足の焼結層上層部に
おける擬似粒子の固体燃料の量を増やし、熱量過剰の焼
結層下層部の擬似粒子の固体燃料の量を減らすことで、
焼結層上下方向の熱量が均一化する。このように熱量均
一化することによって上記擬似粒子設計による融液生成
の制御が容易となる。At the time of actual sintering, the raw material having the above-mentioned pseudo-particle structure is loaded on a sintering machine pallet to form a sintering layer (sintering bed), and a coke oven gas or the like is formed there. And sintering is performed. Here, when the fuel is charged so that the amount of the solid fuel is segregated in the vertical direction of the sintered layer, a further improvement effect is obtained. Specifically, by increasing the amount of solid fuel of the pseudo-particles in the upper layer of the sintered layer with insufficient heat, and reducing the amount of the solid fuel of the pseudo-particles in the lower layer of the calorific excess,
The amount of heat in the vertical direction of the sintered layer becomes uniform. By making the heat quantity uniform in this way, it becomes easy to control the generation of the melt by the pseudo particle design.
【００２５】[0025]
【実施例】従来法と実施例の配合条件を表１に示す。配
合率は、全鉱石を１００％としたときの重量比率で示し
た。全ての実験条件で、高結晶水含有鉱石としてのピソ
ライト鉱石の使用量は４０％、生石灰添加量は０．５
％、コークスの添加量は３．８％とした。また、Ａ鉱
石、Ｂ鉱石および石灰石は、塩基度が１．８、成品焼結
鉱中のシリカ含有量（目標値）が５．３％となるように
配合調整を行った。なお、Ａ鉱石とＢ鉱石とは成分が異
なり、Ａ鉱石のほうがＳｉＯ2 が多い。このように２種
類の鉱石を使用したのは、焼結鉱のシリカ分を調節する
ためである。EXAMPLES Table 1 shows the mixing conditions of the conventional method and the examples. The compounding ratio was shown as a weight ratio when the total ore was 100%. Under all experimental conditions, the amount of pisolite ore used as the ore containing high crystal water was 40%, and the amount of quicklime added was 0.5.
% And the amount of coke added were 3.8%. The ore A, the ore B, and the limestone were adjusted so that the basicity was 1.8 and the silica content (target value) in the product sintered ore was 5.3%. The ore A and the ore B have different components, and the ore A has more SiO 2 . The reason for using the two types of ores is to adjust the silica content of the sintered ore.
【００２６】実施例１では、マグネタイト系微粉鉱石と
コークスを主体とする外層を、ピソライト鉱石を４０％
含有する内層の外側に被覆した。また、生石灰を外層に
添加したが、これは造粒性を高めるためであり、反応に
は関与しないように添加量は０．５％とした。In Example 1, the outer layer mainly composed of magnetite-based fine ore and coke was made of 40% pisolite ore.
It was coated on the outside of the containing inner layer. Also, quick lime was added to the outer layer, in order to enhance granulation properties, and the addition amount was set to 0.5% so as not to be involved in the reaction.
【００２７】また実施例２では、砂鉄とコークスを主体
とする外層を内層の外側に被覆し、実施例１と同様に
０．５％の生石灰を外層に添加した。In Example 2, an outer layer mainly composed of iron sand and coke was coated on the outer side of the inner layer, and 0.5% of quicklime was added to the outer layer as in Example 1.
【００２８】[0028]
【表１】 実験のフローを図２に示す。従来法では、（ａ）に示す
ように、全原料１４をミキサー１１に装入し、混合した
後、ミキサー１２にて水分を添加しながら造粒を行っ
た。一方、実施例１、２では、表１の内層用原料１５を
ミキサー１１にて混合、造粒を行った後、その粒子とと
もに表１の外層用原料１６をミキサー１２に装入し、ミ
キサー１１で形成された粒子の表層部に原料１６を被覆
させ、擬似粒子を形成した。その後、いずれの方法にお
いてもこの擬似粒子を焼結装置１３に装入し、焼結を行
った。[Table 1] FIG. 2 shows a flow of the experiment. In the conventional method, as shown in (a), all the raw materials 14 were charged into a mixer 11 and mixed, and then granulation was performed by adding water with a mixer 12. On the other hand, in Examples 1 and 2, the raw material 15 for the inner layer shown in Table 1 was mixed and granulated by the mixer 11 and then the raw material 16 for the outer layer shown in Table 1 was charged into the mixer 12 together with the particles. The raw material 16 was coated on the surface layer of the particles formed in the above step to form pseudo particles. Thereafter, in any of the methods, the pseudo particles were charged into the sintering device 13 and sintered.
【００２９】実施例１にて造粒した擬似粒子の断面の写
真を図３に示す。図３の（ａ）は微粒のピソライト鉱石
を用いた擬似粒子の断面を示す。この（ａ）から、微粒
のピソライト鉱石、石灰石、Ａ鉱石（微粉）、Ｂ鉱石
（微粉）からなる粒子の表層部にマグネタイト系微粉鉱
石とコークスからなる被覆層が形成されている様子が観
察できる。また、図３の（ｂ）は粗粒のピソライト鉱石
を用いた擬似粒子の断面を示す。この（ｂ）から、粗粒
のピソライト鉱石（中央の多孔質部分）に石灰石、Ａ鉱
石（微粉）、Ｂ鉱石（微粉）、ピソライト鉱石（微粉）
が微量付着してなる粒子の表層部にマグネタイト系微粉
鉱石とコークスからなる被覆層が形成されているのがわ
かる。FIG. 3 shows a photograph of a cross section of the pseudo particles granulated in Example 1. FIG. 3A shows a cross section of pseudo particles using fine pisolite ore. From this (a), it can be observed that a coating layer composed of magnetite-based fine ore and coke is formed on the surface layer of particles composed of fine pisolite ore, limestone, ore A (fine powder), and ore B (fine powder). . FIG. 3B shows a cross section of pseudo particles using coarse pisolite ore. From this (b), limestone, A ore (fine), B ore (fine), and pisolite ore (fine) were added to coarse pisolite ore (the central porous portion).
It can be seen that a coating layer composed of magnetite-based fine ore and coke was formed on the surface layer of the particles having a small amount of adhered.
【００３０】なお、実際には図３（ａ），（ｂ）に示す
擬似粒子以外に、粗粒のＡ鉱石、Ｂ鉱石を核粒子とする
擬似粒子も存在するが、本発明の作用には関与しないの
で説明を省略する。Actually, in addition to the pseudo-particles shown in FIGS. 3A and 3B, there are pseudo-particles having coarse particles of A ore and B ore as core particles. The description is omitted because it is not involved.
【００３１】擬似粒子の焼結は、焼結装置１３内に擬似
粒子を装入して焼結層を形成し、点火帯にて焼結層にコ
ークス炉ガスを供給して点火し、擬似粒子中のコークス
を燃焼させることによって行った。The sintering of the pseudo-particles is performed by charging the pseudo-particles into the sintering device 13 to form a sintered layer, supplying a coke oven gas to the sintered layer in an ignition zone, and igniting the pseudo-particles. This was done by burning the coke inside.
【００３２】上述した従来法、実施例１、実施例２の方
法によって形成した擬似粒子を用いてこのように焼成試
験を行った結果を図４に示す。図４は原燃料を均一に混
合した従来法、実施例１、実施例２の方法で製造した擬
似粒子を焼結してなる焼結鉱石の落下強度、および歩
留、生産率を示す図である。FIG. 4 shows the results of the firing test performed in this way using the pseudo particles formed by the above-described conventional methods, Examples 1 and 2. FIG. 4 is a diagram showing the drop strength, yield, and production rate of a sintered ore obtained by sintering the pseudo-particles manufactured by the conventional method in which the raw fuel is uniformly mixed, the methods of Examples 1 and 2, and the yield. is there.
【００３３】この図に示すように、実施例１、実施例２
によって製造した焼結鉱は共に従来法によって製造され
た焼結鉱よりも落下強度が高く、また実施例１、実施例
２の場合には従来法に対して生産率改善の効果が認めら
れた。As shown in this figure, the first embodiment and the second embodiment
Of the sintered ore manufactured by the conventional method had higher drop strength than that of the sintered ore manufactured by the conventional method, and in the case of Examples 1 and 2, the effect of improving the production rate was recognized as compared with the conventional method. .
【００３４】次に、外層用原料のマグネタイト系鉱石、
砂鉄の適正量を調べるために、表２に示す配合条件で試
験を行った。Next, a magnetite ore as a raw material for the outer layer,
In order to investigate the appropriate amount of iron sand, a test was performed under the mixing conditions shown in Table 2.
【００３５】この表において、配合率は、全鉱石を１０
０％としたときの重量比率で示した。全ての実験条件
で、ピソライト鉱石の使用量は４０％、生石灰添加量は
０．５％、コークスの添加量は４．０％（内層１．０
％、外層３．０％）とした。また、Ａ鉱石、Ｂ鉱石およ
び石灰石は、塩基度が１．８、成品焼結鉱中のシリカ含
有量（目標値）が４．５％となるように配合調整を行っ
た。この原料を図２に示すフローで焼成試験を行った。In this table, the mixing ratio is 10% for all ore.
It was shown by weight ratio when it was set to 0%. Under all experimental conditions, the used amount of pisolite ore was 40%, the amount of quicklime added was 0.5%, and the amount of coke added was 4.0% (inner layer 1.0%).
%, Outer layer 3.0%). The ore A, the ore B, and the limestone were adjusted so that the basicity was 1.8 and the silica content (target value) in the product sintered ore was 4.5%. This raw material was subjected to a firing test according to the flow shown in FIG.
【００３６】実施例３では外層のマグネタイト系微粉鉱
石の量を０〜３０％の間で変化させ、実施例４では外層
の砂鉄の量を０〜１５％の間で変化させた。In Example 3, the amount of the magnetite-based fine ore in the outer layer was changed between 0 and 30%, and in Example 4, the amount of iron sand in the outer layer was changed between 0 and 15%.
【００３７】[0037]
【表２】 この際の難溶融性鉱石の被覆量が生産率に及ぼす影響を
図５、図６に示す。図５は難溶融性鉱石としてマグネタ
イト系微粉鉱石を用いた場合であり、図６は砂鉄を用い
た場合である。[Table 2] FIGS. 5 and 6 show the effect of the amount of the hardly meltable ore on the production rate at this time. FIG. 5 shows a case in which magnetite-based fine ore is used as the hardly meltable ore, and FIG. 6 shows a case in which iron sand is used.
【００３８】これらの図に示すように、微粉鉱石の被覆
量には適正値が存在することが明らかとなった。微粉鉱
石の被覆量の増加によって焼結時間が短縮され生産率が
改善されるが、さらに微粉鉱石の被覆量を増加すると融
液不足による歩留低下によって生産率が低下している。
図５から判断すると、マグネタイト系微粉鉱石の被覆量
の適正値は全鉱石量に対して最大３０％であり、図６か
ら判断すると、砂鉄の被覆量の適正値は全鉱石量にに対
して最大１０％である。As shown in these figures, it became clear that there was an appropriate value for the coating amount of the fine ore. The sintering time is shortened and the production rate is improved by increasing the coating amount of the fine ore. However, when the coating amount of the fine ore is further increased, the production rate is lowered due to a decrease in the yield due to a shortage of the melt.
Judging from FIG. 5, the appropriate value of the coverage of the magnetite-based fine ore is up to 30% of the total ore amount. Judging from FIG. 6, the appropriate value of the iron sand coverage is the same as the total ore amount. Up to 10%.
【００３９】[0039]
【発明の効果】以上説明したように、本発明によれば、
従来焼結原料として使用が困難であったピソライト鉱石
を多量に使用しても、高い生産性を維持したまま、品質
の優れた焼結鉱製造することが可能となる。As described above, according to the present invention,
Even if a large amount of pisolite ore, which has conventionally been difficult to use as a sintering raw material, is used, high quality sintered ore can be produced while maintaining high productivity.
【図１】本発明の方法によって形成された擬似粒子の構
造を示す模式図であり、（ａ）は微粒のピソライト鉱石
を用いた場合、（ｂ）は粗粒ののピソライト鉱石を用い
た場合を示すものである。FIG. 1 is a schematic diagram showing the structure of pseudo particles formed by the method of the present invention, wherein (a) shows a case where fine pisolite ore is used, and (b) shows a case where coarse pisolite ore is used. It shows.
【図２】焼結鉱石の製造フローを説明するための模式図
であり、（ａ）は従来のフロー、（ｂ）は本発明の実施
例のフローを示すものである。FIG. 2 is a schematic diagram for explaining a production flow of a sintered ore, in which (a) shows a conventional flow, and (b) shows a flow of an embodiment of the present invention.
【図３】実施例１にて作成した擬似粒子の粒子構造を示
す写真であり、（ａ）は微粒のピソライト鉱石を用いた
もの、（ｂ）は粗粒のピソライト鉱石を用いたものを示
す。FIGS. 3A and 3B are photographs showing the particle structure of pseudo particles prepared in Example 1, wherein FIG. 3A shows a case using fine pisolite ore, and FIG. 3B shows a case using coarse pisolite ore. .
【図４】従来法、実施例１および実施例２によって製造
した焼結鉱の落下強度、および従来法、実施例１および
実施例２によって焼結鉱を製造する際の歩留および生産
率を比較して示す図。FIG. 4 shows the drop strength of the sintered ore produced according to the conventional method, Example 1 and Example 2, and the yield and the production rate when producing the sintered ore according to the conventional method, Example 1 and Example 2. FIG.
【図５】被覆層（外層）に含有されるマグネタイト系微
粉鉱石の量と生産率との関係を示す図。FIG. 5 is a view showing the relationship between the amount of magnetite-based fine ore contained in the coating layer (outer layer) and the production rate.
【図６】被覆層（外層）に含有される砂鉄の量と生産率
との関係を示す図。FIG. 6 is a diagram showing the relationship between the amount of iron sand contained in a coating layer (outer layer) and the production rate.
１……集合粒子 ２……被覆層 ３……高結晶水鉱石 ４……含ＣａＯ副原料 ５……被覆層 １１，１２……ミキサー １３……焼結装置 １４，１５，１６……原料 DESCRIPTION OF SYMBOLS 1 ... Assembled particle 2 ... Coating layer 3 ... High crystal water ore 4 ... CaO-containing auxiliary raw material 5 ... Coating layer 11,12 ... Mixer 13 ... Sintering device 14,15,16 ... Raw material
フロントページの続き (56)参考文献 特開 平５−339653（ＪＰ，Ａ) 特開 平６−220549（ＪＰ，Ａ) 特開 平２−182841（ＪＰ，Ａ) 特開 平６−279871（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C22B 1/16 Continuation of front page (56) References JP-A-5-339965 (JP, A) JP-A-6-220549 (JP, A) JP-A-2-1822841 (JP, A) JP-A-6-279871 (JP) , A) (58) Field surveyed (Int. Cl. 7 , DB name) C22B 1/16
Claims (9)
する焼結鉱の製造方法であって、高結晶水含有鉱石と含
ＣａＯ副原料とを主体とする粒子の表層に、粒径０．２
５ｍｍ以下の粒子を８０重量％以上含有する難溶融性鉱
石と固体燃料とを主体とする被覆層を形成して擬似粒子
を作成し、この擬似粒子を焼結することを特徴とする焼
結鉱の製造方法。1. A method for producing a sintered ore using a high-crystal water-containing ore as a raw material ore, wherein a surface layer of particles mainly composed of a high-crystal water-containing ore and a CaO-containing auxiliary material has a particle diameter of 0.1%. 2
Forming a coating layer mainly composed of a hard-melting ore containing particles of 5 mm or less in an amount of 80% by weight or more and a solid fuel to form pseudo particles, and sintering the pseudo particles; Manufacturing method.
％以上含み、その原料鉱石全体に対する配合割合が３〜
３０重量％であることを特徴とする請求項１に記載の焼
結鉱の製造方法。2. The hard-to-melt ore contains FeO at 10% by weight or more, and its compounding ratio with respect to the entire raw material ore is 3 to 3.
The method for producing a sintered ore according to claim 1, wherein the content is 30% by weight.
むことを特徴とする請求項２に記載の焼結鉱の製造方
法。3. The method according to claim 2, wherein the hardly meltable ore contains magnetite.
％以上含み、その原料鉱石全体に対する配合割合が１〜
１０重量％であることを特徴とする請求項１に記載の焼
結鉱の製造方法。4. The hard-to-melt ore contains 4% by weight or more of TiO 2 , and its compounding ratio to the whole raw material ore is 1 to 4.
The method for producing a sintered ore according to claim 1, wherein the content is 10% by weight.
ナイトを含むことを特徴とする請求項４に記載の焼結鉱
の製造方法。5. The method according to claim 4, wherein the hardly meltable ore contains iron sand or ilmenite.
の結晶水を含むことを特徴とする請求項１ないし請求項
５のいずれか１項に記載の焼結鉱の製造方法。6. The method for producing a sintered ore according to claim 1, wherein the ore containing high crystallization water contains 4% by weight or more of crystallization water.
全体に対する配合割合が２０重量％以上であることを特
徴とする請求項１ないし請求項６のいずれか１項に記載
の焼結鉱の製造方法。7. The sinter according to claim 1, wherein the high crystal water content ore has a compounding ratio of 20% by weight or more with respect to the whole raw material ore. Manufacturing method.
ャー、廃プラスチックの１種または２種以上を含むこと
を特徴とする請求項１ないし請求項７のいずれか１項に
記載の焼結鉱の製造方法。8. The sinter according to claim 1, wherein the solid fuel includes at least one of coke, anthracite, char, and waste plastic. Manufacturing method.
に、焼結炉の焼結層上層の擬似粒子の固体燃料量が、焼
結層下層の擬似粒子の固体燃料量よりも多くなるように
して焼結機に装入し焼結することを特徴とする請求項１
ないし請求項８のいずれか１項に記載の焼結鉱の製造方
法。9. When sintering the pseudo particles in a sintering furnace, the solid fuel amount of the pseudo particles in the upper layer of the sintered layer of the sintering furnace is larger than the solid fuel amount of the pseudo particles in the lower layer of the sintering layer. 2. The sintering machine according to claim 1, wherein the sintering is performed in such a manner as to increase the number of sintering machines.
A method for producing a sintered ore according to any one of claims 8 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09593295A JP3344151B2 (en) | 1995-03-30 | 1995-03-30 | Sinter production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09593295A JP3344151B2 (en) | 1995-03-30 | 1995-03-30 | Sinter production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08269584A JPH08269584A (en) | 1996-10-15 |
| JP3344151B2 true JP3344151B2 (en) | 2002-11-11 |
Family
ID=14151055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09593295A Expired - Fee Related JP3344151B2 (en) | 1995-03-30 | 1995-03-30 | Sinter production method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3344151B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100821076B1 (en) * | 2001-11-02 | 2008-04-08 | 주식회사 포스코 | A method of iron ore sintering using anthracite and coke as fuel |
| JP4816119B2 (en) * | 2006-02-09 | 2011-11-16 | Ｊｆｅスチール株式会社 | Method for producing sintered ore |
| AT507261B1 (en) * | 2008-09-11 | 2010-09-15 | Siemens Vai Metals Tech Gmbh | PROCESS FOR THE PREPARATION OF AGGLOMERATES |
| JP6075231B2 (en) * | 2013-07-03 | 2017-02-08 | 新日鐵住金株式会社 | Method for producing sintered ore |
| JP2015063716A (en) * | 2013-09-24 | 2015-04-09 | 株式会社神戸製鋼所 | Iron ore mini pellet for sintered ore manufacturing |
| JP2016130341A (en) * | 2015-01-14 | 2016-07-21 | 株式会社神戸製鋼所 | Method of producing sintered ore raw material using magnetite ore |
| JP6510849B2 (en) * | 2015-03-25 | 2019-05-08 | 株式会社神戸製鋼所 | Raw material for sintered ore and method for producing raw material for sintered ore |
-
1995
- 1995-03-30 JP JP09593295A patent/JP3344151B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08269584A (en) | 1996-10-15 |
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