JPH05195088A - Pre-treatment of raw sintered ore for blast furnace - Google Patents
Pre-treatment of raw sintered ore for blast furnaceInfo
- Publication number
- JPH05195088A JPH05195088A JP25199492A JP25199492A JPH05195088A JP H05195088 A JPH05195088 A JP H05195088A JP 25199492 A JP25199492 A JP 25199492A JP 25199492 A JP25199492 A JP 25199492A JP H05195088 A JPH05195088 A JP H05195088A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- ore
- fine
- grain
- high goethite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、高ゲーサイト鉱石を使
用する高炉用焼結鉱原料の事前処理に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to pretreatment of sinter ore raw material for blast furnace using high goethite ore.
【０００２】[0002]
【従来の技術】高炉製銑法の主要原料である焼結鉱は、
以下のようにして製造されるのが一般的である。まず約
１０ｍｍ以下の鉄鉱石粉に石灰石、ドロマイト、転炉滓
などの含ＣａＯ系原料、珪石、蛇紋岩などの含ＳｉＯ2
系原料等の副原料および粉コークス、無煙炭などの固体
燃料、さらに適量の水分を加えて、造粒機例えばドラム
ミキサーにより混合・造粒して擬似粒子化（複数の粒子
が相互に結合したもの、又は粗粒子の周囲を微粉で被覆
したものが混在した平均粒径が２〜３ｍｍ程度の粒子）
する。2. Description of the Related Art Sintered ore, which is the main raw material for the blast furnace pig iron production
It is generally manufactured as follows. First, iron ore powder of about 10 mm or less is added to CaO-containing raw materials such as limestone, dolomite, converter slag, etc., and silica-containing SiO 2 such as silica stone and serpentine.
Auxiliary materials such as system raw materials, powdered coke, solid fuel such as anthracite, and an appropriate amount of water are added and mixed and granulated by a granulator such as a drum mixer to form pseudo particles (a plurality of particles bonded to each other. , Or a mixture of coarse particles coated with fine powder and having an average particle diameter of about 2 to 3 mm)
To do.
【０００３】つぎにこの擬似粒子化した原料を、火格子
移動式の焼結パレット上に５００ｍｍ前後の高さに充填
し、この充填ベット表層部の固体燃料に点火し、下方に
向けて空気を吸引しながらコークスを燃焼させてその時
に発生する燃焼熱によって原料を焼結し、焼結ケーキを
製造する。この焼結ケーキを破砕、整粒し、３ｍｍ以上
の粒子とする。Next, the pseudo-granulated raw material is packed on a grate moving type sintering pallet at a height of about 500 mm, and the solid fuel in the surface layer of the packed bed is ignited, and air is directed downward. The coke is burned while being sucked, and the raw material is sintered by the combustion heat generated at that time to produce a sintered cake. This sintered cake is crushed and sized to obtain particles of 3 mm or more.
【０００４】前記鉄鉱石は、従来磁鉄鉱（マグネタイ
ト、Ｆｅ3 Ｏ4 ）と赤鉄鉱（ヘマタイト、Ｆｅ2 Ｏ3 ）
を主体としたものであったが、世界の良質鉄鉱石賦存状
態等の鉱石事情により敬遠されがちであったゲーサイト
（Ｆｅ2 Ｏ3 ・Ｈ2 Ｏ）を多く含む鉄鉱石の使用比率が
次第に増大してきている。The above-mentioned iron ores are conventionally magnetite (magnetite, Fe 3 O 4 ) and hematite (hematite, Fe 2 O 3 ).
However, the ratio of iron ore containing a large amount of goethite (Fe 2 O 3 · H 2 O), which was apt to be shunned due to ore circumstances such as the presence of high-quality iron ore in the world, It is gradually increasing.
【０００５】しかしゲーサイトは結晶水を多く含有して
おり、特に結晶水／Ｔ．Ｆｅ≧０．０３のようなゲーサ
イトを多く含む鉱石（高ゲーサイト鉱石）は、焼結ベッ
ド内で脱水して多孔質化し、歩留、強度、還元性状を低
下させる問題を引き起こす。つまり高ゲーサイト鉱石
は、前記焼結パレット上で２５０〜５００℃前後になる
と、結晶水が分解・脱水しかつ亀裂も発生して多孔質な
ものに変わる。However, goethite contains a large amount of water of crystallization, and in particular, water of crystallization / T. An ore containing a large amount of goethite such as Fe ≧ 0.03 (high goethite ore) is dehydrated in the sintering bed to become porous, which causes a problem of reducing yield, strength, and reducing properties. That is, when the high goethite ore is around 250 to 500 ° C. on the sintering pallet, the water of crystallization decomposes and dehydrates and cracks occur, and the high goethite ore becomes porous.
【０００６】一方ＣａＯとヘマタイトは、焼結過程で略
１，２００℃になると反応して粘性の低い融液となる。
ここでその融液は、直ちに多孔質となった前記高ゲーサ
イト鉱石の気孔および亀裂のなかへ浸入する。この浸入
によりヘマタイト粒子間は急速に分断されて、一部は融
液に溶け込み同化反応を起こす。On the other hand, CaO and hematite react with each other at a temperature of about 1,200 ° C. in the sintering process to form a melt having a low viscosity.
Here, the melt immediately penetrates into the pores and cracks of the high goethite ore that has become porous. Due to this infiltration, the hematite particles are rapidly separated from each other, and a part thereof is dissolved in the melt to cause an assimilation reaction.
【０００７】また融液の浸入が速いために、気孔および
亀裂内にあった気体が融液中に取り残される。この状態
で冷却された焼結鉱は、多量の粒状ヘマタイト粒子、お
よび多量の１００〜１，０００μｍの粗大気孔から構成
されるようになる。この多量の粒状ヘマタイトと多量の
粗大気孔の存在によって、耐還元粉化性が低下すると共
に、強度、歩留が低下することになる。さらに焼結時に
発生する融液との同化が速いために、焼結ベッド内の融
液生成帯の空隙が急速に閉塞し、コークスなどの固形燃
料の燃焼が遅れ、生産性が低下する。Further, since the melt penetrates quickly, the gas in the pores and cracks is left behind in the melt. The sinter cooled in this state is composed of a large amount of granular hematite particles and a large amount of coarse air holes of 100 to 1,000 μm. The presence of this large amount of granular hematite and a large amount of coarse air holes lowers the resistance to reduction and pulverization, as well as the strength and the yield. Furthermore, since the assimilation with the melt generated during sintering is rapid, the voids in the melt generation zone in the sintering bed are rapidly closed, the combustion of solid fuel such as coke is delayed, and the productivity is reduced.
【０００８】このような問題は、高ゲーサイト鉱石のな
かでも焼結過程での亀裂の発生の多い粗粒（２ｍｍ以
上）部分での発生が多い。[0008] Such problems often occur in coarse grains (2 mm or more) where cracks often occur during the sintering process even among high goethite ores.
【０００９】以上の問題のため、高ゲーサイト鉱石の使
用量は増えてきているとはいえ、まださほど多くはな
い。しかし前述のような鉄鉱石事情に鑑みれば、高ゲー
サイト鉱石の効果的使用の開発の意義は大きく、この高
ゲーサイト鉱石を多量に使用することが試み始められて
いる。Due to the above problems, the amount of high goethite ore used is increasing, but it is not so large yet. However, in view of the iron ore situation as described above, the development of effective use of high goethite ore has great significance, and attempts have been made to use a large amount of this high goethite ore.
【００１０】この方法として、例えば特開平１−１９１
７５０号公報の提案がある。これは粗粒の高ゲーサイト
鉱石と蛇紋岩粉をドラムミキサーで混合造粒し、この高
ゲーサイト鉱石の周囲を蛇紋岩で被覆造粒した粒径６ｍ
ｍ程度の造粒物（以下、単に造粒物と称す）と前記した
従来の焼結原料と配合して、更にミキサーで造粒して焼
結原料とすることにより、前記融液とＭｇＯ−ＳｉＯ2
系原料と反応させて融液の流動性を抑制し、高ゲーサイ
ト鉱石との同化を阻止しようとするものである。As this method, for example, JP-A-1-191
There is a proposal of Japanese Patent No. 750. This is a coarse goethite ore and serpentine powder mixed and granulated with a drum mixer.
Granules of about m (hereinafter, simply referred to as granules) and the above-mentioned conventional sintering raw material are blended and further granulated with a mixer to obtain a sintering raw material, whereby the melt and MgO- SiO 2
It is intended to suppress the assimilation with high goethite ore by reacting with the system raw material to suppress the fluidity of the melt.
【００１１】又、最近の焼結機においては、焼結パレッ
ト上の焼結原料の上層への熱源偏析を強化するため、該
上層部に細粒を、下層部に粗粒を装入することが行われ
ている。In recent sintering machines, in order to enhance the heat source segregation in the upper layer of the sintering raw material on the sintering pallet, fine particles are charged in the upper layer portion and coarse particles are charged in the lower layer portion. Is being done.
【００１２】[0012]
【発明が解決しようとする課題】しかし特開平１−１９
１７５０号公報は、高ゲーサイト鉱石と蛇紋岩を造粒し
た造粒物を再び従来より使用している焼結原料と共に造
粒するために、前記造粒物の高ゲーサイト鉱石の周囲を
被覆した蛇紋岩の一部が剥離して、蛇紋岩が従来より使
用している焼結鉱原料に混入する結果、充分な効果を発
揮することができない。However, Japanese Patent Laid-Open No. 1-19
No. 1750 discloses a method in which a granulated product obtained by granulating high goethite ore and serpentine is coated around the high goethite ore of the granulated product in order to granulate the granulated product together with a conventionally used sintering raw material. As a result of a part of the serpentinite peeled off and the serpentinite is mixed into the sinter ore raw material that has been conventionally used, a sufficient effect cannot be exerted.
【００１３】更に、この造粒物は６〜７ｍｍと他の焼結
原料より粗いため、前記のように偏析装入した場合には
焼結ベッド上の下層に装入される。このため、粒度の小
さいＣａＯ系原料が少なく、前記融液が不足して周囲の
組織と前記造粒物の結合状態が弱くなり、焼結鉱の歩留
を低下させるものであった。Further, since this granulated product is 6 to 7 mm, which is coarser than other sintering raw materials, when it is segregated and charged as described above, it is charged in the lower layer on the sintering bed. Therefore, the amount of CaO-based raw material having a small particle size is small, the melt is insufficient, the bonding state between the surrounding structure and the granulated product is weakened, and the yield of the sintered ore is reduced.
【００１４】本発明は前記造粒物の被覆層を剥離させる
ことなく焼結ベッドに装入し、しかも焼結パレットの下
層の高ゲーサイト鉱石造粒物相互及び該造粒物と上部組
織と反応させて結合することによって品質を有する焼結
鉱とすることにより、焼結鉱生産性、歩留、強度、還元
性状を低下させることなく２ｍｍ以上を主体とする高ゲ
ーサイト鉱石を多量に使用することを可能とする焼結鉱
原料の事前処理方法を提供するものである。According to the present invention, the granulated coating layer is placed in a sintering bed without being peeled off, and the high goethite ore granulated material in the lower layer of the sintering pallet and the granulated material and the upper structure are combined with each other. A large amount of high goethite ore mainly composed of 2 mm or more is used without deteriorating sinter productivity, yield, strength, and reducing properties by reacting and binding to form a sinter having quality. It is intended to provide a pretreatment method for a sintered ore raw material that enables the above.
【００１５】[0015]
【課題を解決するための手段】本発明の要旨は、鉄鉱
石、副原料、及び固体燃料を第１ミキサーで混合造粒し
て平均粒径が２〜３ｍｍに擬似粒化した擬似粒化物を製
造すると共に粒径２ｍｍ以上を主体とする高ゲーサイト
鉱石及び粒径１ｍｍ以下を主体とする細粒原料を前記第
１ミキサーとは別に設けた造粒用第２ミキサーに導入し
て、水を添加して造粒し、該造粒物と前記擬似粒化物と
を焼結機に供給する高炉用焼結鉱原料の事前処理方法に
おいて、造粒用第２ミキサーに導入する前記細粒原料を
２０〜６０重量％、前記粒径２ｍｍ以上を主体とする高
ゲーサイト鉱石を４０〜８０重量％、水分を外掛けで８
〜１４重量％にすると共に、前記細粒原料としてＭｇＯ
−ＳｉＯ2 系原料、ＣａＯ系原料、ヘマタイト含有鉱石
を主体とし、しかも、該ヘマタイト含有鉱石がＣａＯ系
原料の１５〜８５重量％で、且つ、塩基度を０．４〜
１．４とし、更に、第２ミキサーからの造粒物５〜６０
重量％、前記第１ミキサーからの擬似粒化物４０〜９５
重量％にして焼結機に供給することを特徴とする高炉用
焼結鉱原料の事前処理方法である。上記細粒原料とし
て、上記種類の原料の他に１ｍｍ以下を主体とする固体
燃料を１６重量％以下配合すること、前記高ゲーサイト
鉱石を２〜１０ｍｍとすることは好ましい。尚、本発明
における粒径はＪＩＳＺ８８０１の標準篩法で測定した
ものである。Means for Solving the Problems The gist of the present invention is a pseudo-granulated product in which iron ore, an auxiliary raw material, and a solid fuel are mixed and granulated by a first mixer and pseudo-granulated to have an average particle size of 2 to 3 mm. A high goethite ore mainly having a particle size of 2 mm or more and a fine-grain raw material mainly having a particle size of 1 mm or less are manufactured and introduced into a second granulating mixer provided separately from the first mixer to supply water. In the pretreatment method of the sinter ore raw material for blast furnace, which is added and granulated, and supplies the granulated product and the pseudo-granulated product to the sintering machine, the fine-grain raw material to be introduced into the second granulating mixer is 20 to 60% by weight, 40 to 80% by weight of high goethite ore mainly having a particle size of 2 mm or more, and 8 by adding water to the outside.
.About.14% by weight and MgO as the fine grain raw material.
-SiO 2 based material, CaO-based material, a hematite-containing ore mainly, moreover, the hematite-containing ore with 15 to 85 wt% of the CaO-based material, and the basicity 0.4
1.4, and further granulate 5-60 from the second mixer
% By weight, pseudo-granulate 40-95 from the first mixer
This is a pretreatment method for a sinter ore raw material for a blast furnace, which comprises supplying the sinter to a sintering machine in a weight percentage. It is preferable that, as the fine-grain raw material, in addition to the raw materials of the above-mentioned types, 16% by weight or less of a solid fuel mainly containing 1 mm or less is mixed, and the high goethite ore is 2 to 10 mm. The particle diameter in the present invention is measured by the standard sieving method of JIS Z8801.
【００１６】[0016]
【作用】上記課題を解決するため、本発明者等は種々の
実験検討を重ねた結果、２ｍｍ以上の高ゲーサイト鉱
石を１ｍｍ以下の含ＭｇＯ−ＳｉＯ2 系原料（蛇紋岩、
橄欖石、滑石など数多くの粘土鉱物があるが、造粒性及
び焼結の改善効果は原料銘柄で大きく変わらなかったの
で、以下には最も産出量の多い蛇紋石の例で説明する）
とＣａＯ系原料（以下石灰石の例で説明する）及びヘマ
タイトを含有する鉱石（赤鉄鉱、高ゲーサイト鉱石等で
あり、以下高ゲーサイト鉱石粉で説明する）を主体とす
る細粒原料で被覆した造粒物の被覆層厚が、焼結ベッド
内で４００μｍ以上あれば前記焼結鉱の生産性、歩留、
強度、還元性状を低下することなく、従来の焼結鉱と同
等レベルの生産性、歩留、強度、還元性状を確保でき、
２ｍｍ以上の高ゲーサイト鉱石の周囲を前記細粒原料
で造粒被覆した粒径６ｍｍ程度の造粒物の強度を、小型
Ｉ型ドラム（ＪＩＳ ３４５２のＳＧＰ−５Ｂ）にその
造粒物を３００ｇ装入し、２０ｒｐｍで２分間回転後３
ｍｍ以上の比率が９５％以上有れば、上記高ゲーサイト
鉱石を細粒原料により造粒被覆した状態のまま、他の焼
結原料と一緒にベルトコンベアーで焼結機へ搬送する際
に、その乗継部等による落下衝撃による細粒原料の剥離
が少なくなり、効率的な搬送が出来ることの知見を得
た。In order to solve the above-mentioned problems, the inventors of the present invention have conducted various experiments and studies, and as a result, have made a high goethite ore of 2 mm or more into a MgO-SiO 2 -based raw material (serpentine,
There are many clay minerals such as olivine and talc, but the improvement effect of granulation and sintering did not change significantly depending on the raw material brand, so the example of serpentine with the highest yield is explained below.)
And CaO-based raw material (explained in the example of limestone below) and ore containing hematite (hematite, high goethite ore, etc., described below in high goethite ore powder) If the coating layer thickness of the granulated product is 400 μm or more in the sintering bed, the productivity of the sintered ore, the yield,
The same level of productivity, yield, strength and reducing properties as conventional sinter can be secured without lowering the strength and reducing properties.
The strength of a granulated product having a particle size of about 6 mm obtained by granulating and coating the periphery of a high goethite ore of 2 mm or more with the fine-grain raw material is 300 g of the granulated product on a small I-shaped drum (SGP-5B of JIS 3452). Charge and rotate at 20 rpm for 2 minutes, then 3
When the ratio of mm or more is 95% or more, when the high goethite ore is granulated and coated with the fine-grain raw material, when it is conveyed to the sintering machine by the belt conveyor together with other sintering raw materials, We have found that the separation of fine-grained raw materials due to the impact of dropping at the connecting part etc. is reduced and efficient transportation is possible.
【００１７】これらの知見に基づいて、本発明はなされ
たものであり、その要旨は、鉄鉱石、副原料、及び固体
燃料を第１ミキサーで混合造粒して平均粒径が２〜３ｍ
ｍに擬似粒化した擬似粒化物を製造すると共に粒径２ｍ
ｍ以上を主体とする高ゲーサイト鉱石及び粒径１ｍｍ以
下を主体とする細粒原料を前記第１ミキサーとは別に設
けた造粒用第２ミキサーに導入して、水を添加して造粒
し、該造粒物と前記擬似粒化物とを焼結機に供給する高
炉用焼結鉱原料の事前処理方法において、造粒用第２ミ
キサーに導入する前記細粒原料を２０〜６０重量％、前
記粒径２ｍｍ以上を主体とする高ゲーサイト鉱石を４０
〜８０重量％、水分を外掛けで８〜１４重量％にすると
共に、前記細粒原料としてＭｇＯ−ＳｉＯ2 系原料、Ｃ
ａＯ系原料、ヘマタイト含有鉱石を主体とし、しかも、
該ヘマタイト含有鉱石がＣａＯ系原料の１５〜８５重量
％で、且つ、塩基度を０．４〜１．４とし、更に、第２
ミキサーからの造粒物５〜６０重量％、前記第１ミキサ
ーからの擬似粒化物４０〜９５重量％にして焼結機に供
給することを特徴とする高炉用焼結鉱原料の事前処理方
法である。The present invention has been made based on these findings, and the gist thereof is that the iron ore, the auxiliary raw material, and the solid fuel are mixed and granulated by the first mixer to have an average particle diameter of 2 to 3 m.
m to produce a pseudo-granulated product with a grain size of 2 m
A high goethite ore mainly containing m or more and a fine-grain raw material mainly having a particle size of 1 mm or less are introduced into a second mixer for granulation which is provided separately from the first mixer, and water is added to granulate. Then, in the pretreatment method of the sinter ore raw material for a blast furnace, which supplies the granulated product and the pseudo-granulated product to a sintering machine, the fine granule raw material to be introduced into the second granulating mixer is 20 to 60% by weight. 40 high goethite ores mainly having a grain size of 2 mm or more
80 wt%, while the 8 to 14 wt% water in outer percentage, MgO-SiO 2 based material as the fine material, C
Mainly composed of aO raw material and ore containing hematite,
The hematite-containing ore is 15 to 85% by weight of the CaO-based raw material and has a basicity of 0.4 to 1.4.
A pretreatment method for a sinter ore raw material for a blast furnace, which comprises supplying 5 to 60% by weight of a granulated product from a mixer and 40 to 95% by weight of a pseudo-granulated product from the first mixer to a sintering machine. is there.
【００１８】尚、第１、第２ミキサーは、焼結工程で一
般に使用されている構造のドラムミキサー、又はパンペ
レットでよい。The first and second mixers may be drum mixers or pan pellets having a structure generally used in the sintering process.
【００１９】本発明は高ゲーサイト鉱石のなかでも焼結
過程での亀裂の発生が多く、しかも造粒に際して核とな
る２ｍｍ以上の粗粒部分と、１ｍｍ以下の蛇紋岩、石灰
石、高ゲーサイト鉱石粉の細粒原料を前記配合割合で第
２ミキサー（以下、ドラムミキサーの例で説明する）に
導入して造粒することにより、２ｍｍ以上の粗粒高ゲー
サイト鉱石を上記細粒原料で被覆した造粒物を作るもの
である。この際、細粒原料の粒度を１ｍｍ超とすると、
２ｍｍ以上の高ゲーサイト鉱石表面への付着性が悪くな
り層厚が４００μｍ以上の造粒物とするための造粒歩留
りが大幅に低下するため、その粒度を１ｍｍ以下とす
る。In the present invention, among the high goethite ores, there are many cracks during the sintering process, and moreover, the coarse-grained portion of 2 mm or more that becomes the core during granulation and the serpentine, limestone, or high goethite of 1 mm or less. A fine grain raw material of ore powder is introduced into a second mixer (which will be described below with an example of a drum mixer) at the above-mentioned mixing ratio and granulated to obtain a coarse goethite ore of 2 mm or more with the fine grain raw material. This is to make a coated granule. At this time, if the particle size of the fine-grain raw material exceeds 1 mm,
Since the adhesion to the surface of the high goethite ore of 2 mm or more is deteriorated and the granulation yield for forming a granule having a layer thickness of 400 μm or more is significantly reduced, the particle size is set to 1 mm or less.
【００２０】更に粗粒部分の高ゲーサイト鉱石を２ｍｍ
未満にすると、そのままの状態でも該高ゲーサイト鉱石
が焼結過程で亀裂の発生がないために造粒する効果がな
くなる。2 mm of high goethite ore in the coarse grain part
When the amount is less than the above value, the high goethite ore does not cause cracks in the sintering process even in the state as it is, and the effect of granulating is lost.
【００２１】また水分（ＪＩＳ Ｍ ８１０５での測定
値）を被覆造粒物重量の外掛けで８〜１４重量％（以
下、％と称す）、好ましくは９〜１２％に調整すること
によって、細粒原料による２ｍｍ以上の粗粒高ゲーサイ
ト鉱石の被覆造粒を良好に促進して、第２ドラムミキサ
ー出口で細粒原料の被覆層厚を９００μｍ以上に形成す
ると共に、図２に示すように造粒物の前記Ｉ型強度を９
５％以上にする。Further, the moisture content (measured value according to JIS M 8105) is adjusted to 8 to 14% by weight (hereinafter referred to as%), preferably 9 to 12%, by multiplying the weight of the coated granulated product, and thus the fineness can be reduced. The granulation raw material favorably accelerates the coating granulation of coarse grain high goethite ore of 2 mm or more to form the coating layer thickness of the fine granule raw material to 900 μm or more at the outlet of the second drum mixer, and as shown in FIG. The I-type strength of the granulated product is 9
5% or more.
【００２２】これによって、他の擬似粒化焼結鉱原料と
合流させて、コンベヤーベルトを乗継いでサージホッパ
ーを介して焼結ベット上に装入しても、図３に示すごと
く細粒原料被覆層厚は前記４００μｍ以上を維持して前
記効能を確保させることが出来る。As a result, even if the pseudo-granulated sinter ore raw material is merged and loaded onto the sintering bed via the surge hopper by connecting with the conveyor belt, the fine-grain raw material as shown in FIG. The coating layer thickness can be maintained at 400 μm or more to ensure the above-mentioned effects.
【００２３】即ち水分（配合原料が第２ドラムミキサー
内に持込んだ水分量＋第２ドラムミキサー内で添加した
水分量）が２ｍｍ以上の粗粒高ゲーサイト鉱石表面に細
粒原料を付着させるバインダーの役目をするのであっ
て、その水分が８％以下になると、バインダーとしての
水分が不足して、前記細粒原料が粗粒高ゲーサイト鉱石
表面に付着し難くなり、該細粒原料層が薄くなる。更に
その細粒原料被覆層の付着力が弱く、その強度も弱く、
ベルトコンベヤーで焼結機に搬送中、その乗継部等にお
ける衝撃により簡単に破損や剥離してしまう。That is, the fine-grained raw material is adhered to the surface of the coarse-grained high goethite ore having a water content (the amount of the mixed raw material brought into the second drum mixer + the amount of water added in the second drum mixer) of 2 mm or more. When it has a water content of 8% or less, the water as a binder is insufficient, and the fine-grain raw material is less likely to adhere to the surface of the coarse-grain high goethite ore. Becomes thin. Furthermore, the adhesion of the fine-grain raw material coating layer is weak, and its strength is also weak,
While being conveyed to the sintering machine by the belt conveyor, it is easily damaged or peeled off due to the impact at the connecting portion or the like.
【００２４】また水分が１４％以上では、水分過多とな
り細粒原料がスラリー状となり、前記同様に細粒原料が
高ゲーサイト鉱石表面に付着し難くなる。また、付着し
たとしても非常に軟らかく強度的に弱いものとなる。When the water content is 14% or more, the water content becomes excessive, and the fine-grain raw material becomes a slurry, so that the fine-grain raw material hardly adheres to the surface of the high goethite ore as described above. Further, even if it adheres, it becomes very soft and weak in strength.
【００２５】２ｍｍ以上の高ゲーサイト鉱石と細粒原料
の配合割合で、細粒原料を２０％以下にすると、第２ド
ラムミキサーで造粒の際、核となる２ｍｍ以上の高ゲー
サイト鉱石に対して細粒原料が不足し前記焼結で必要と
する細粒原料被覆層（９００μｍ以上）の確保が困難と
なり、細粒原料被覆の下記作用を充分に得られなくな
る。When the content of the fine goethite ore and the fine grain raw material is 2% or more and the fine grain raw material is 20% or less, the high goethite ore, which becomes the core when granulating with the second drum mixer, becomes 2 mm or more. On the other hand, since the fine-grain raw material is insufficient, it becomes difficult to secure the fine-grain raw material coating layer (900 μm or more) required for the sintering, and the following action of the fine-grain raw material coating cannot be sufficiently obtained.
【００２６】また６０％以上にすると、２ｍｍ以上の高
ゲーサイト鉱石に対して細粒原料が多くなり、細粒原料
被覆層が必要以上に厚くなり過ぎたり、細粒原料のみの
造粒物が出来て、２ｍｍ以上の粗粒高ゲーサイト鉱石を
核とする造粒歩留が悪くなり、コスト的に不利になる。Further, if it is 60% or more, the fine-grain raw material is increased with respect to the high goethite ore of 2 mm or more, the fine-grain raw material coating layer becomes excessively thick, or the granulated product of only the fine-grain raw material is formed. If this is possible, the yield of granulation with a coarse grain high goethite ore of 2 mm or more as a core will be poor, which will be a cost disadvantage.
【００２７】次に、細粒原料について説明する。該細粒
原料中の塩基度が０．４〜１．４になるように蛇紋岩と
石灰石を配合し、且つ、１ｍｍ以下の高ゲーサイト鉱石
粉を石灰石の１５〜８５％配合すれば焼結機での加熱に
より、前記石灰石と高ゲーサイト鉱石粉が反応してカル
シウムフェライトを多量に含んだ融液を生成する。そし
て、この融液は蛇紋岩により流動性が低下する。この結
果、焼結機の下層においては造粒物相互又は造粒物と周
囲の通常の焼結鉱と容易に融着する。一方、該融液は前
記のように流動性が悪いために造粒核となっている粗粒
高ゲーサイト鉱石の気孔、亀裂に侵入することがほとん
どなくなる。これにより、高強度のしかも粒度の大きい
焼結鉱の製造が可能となる。Next, the fine grain raw material will be described. Sintering if serpentine and limestone are blended so that the basicity of the fine-grain raw material is 0.4 to 1.4, and high goethite ore powder of 1 mm or less is blended at 15 to 85% of the limestone. The limestone and high goethite ore powder react with each other by heating with a machine to generate a melt containing a large amount of calcium ferrite. Then, the melt is reduced in fluidity by the serpentine. As a result, in the lower layer of the sinter, the granules are easily fused with each other or with the granules and the surrounding ordinary sinter. On the other hand, since the melt has poor fluidity as described above, it hardly enters the pores and cracks of the coarse-grained high goethite ore, which is the granulation nucleus. As a result, it becomes possible to manufacture a sintered ore having high strength and large grain size.
【００２８】細粒原料の各原料の配合割合は該細粒原料
を１００％とすると、蛇紋岩：７５〜３５％、石灰石：
４５〜２２％、細粒高ゲーサイト鉱石粉：３０〜３％が
好ましい。As for the mixing ratio of each raw material of the fine-grain raw material, when the fine-grain raw material is 100%, serpentine: 75-35%, limestone:
45-22%, fine grain high goethite ore powder: 30-3% is preferable.
【００２９】即ち、蛇紋岩を３５％未満にすると、前記
のように粒径２ｍｍ以上を主体とする細粒高ゲーサイト
鉱石粉と石灰石が反応して生成したカルシュームフェラ
イト融液の流動性抑制効果が不足し、焼結後の強度が低
下する。また、蛇紋岩を７５％超にすると、前記カルシ
ュームフェライト融液の流動性が殆どなくなり周囲にあ
る他の焼結原料と融着し難くなり、焼結歩留りが低下す
る。That is, when the serpentine content is less than 35%, the fluidity-suppressing effect of the calcium-ferrite melt produced by the reaction of fine-grain high goethite ore powder mainly having a grain size of 2 mm or more with limestone as described above. Is insufficient and the strength after sintering is reduced. On the other hand, if the serpentine content exceeds 75%, the fluidity of the calcium-ferrite melt is almost lost and it becomes difficult to fuse with other surrounding sintering raw materials and the sintering yield is reduced.
【００３０】更に、石灰石を２２％未満にすると、細粒
原料の融点が下がり前記カルシュームフェライト融液の
生成が前記粗粒高ゲーサイト鉱石の緻密化温度より低く
なり過ぎて、焼結ベッド上に於いて、粗粒高ゲーサイト
鉱石の緻密化時より早期にカルシュームフェライト融液
を生成する。また、４５％超にすると、上記とは反対に
細粒原料の融点が上がり粗粒高ゲーサイト鉱石の緻密化
温度より高くなり過ぎて、該粗粒高ゲーサイト鉱石の緻
密化時より遅れてカルシュームフェライト融液を生成す
る。このため、何れにおいても、粗粒高ゲーサイト鉱石
の緻密化時に上記融液を生成することが出来ず焼結品質
が低下する。Further, when the content of limestone is less than 22%, the melting point of the fine-grain raw material is lowered, and the formation of the calcium-ferrite melt becomes too lower than the densification temperature of the coarse-grained high goethite ore, so that the sinter bed is sunk. At that time, the calcium-ferrite melt is formed earlier than the densification of coarse-grained high goethite ore. On the other hand, if it exceeds 45%, the melting point of the fine-grain raw material rises and becomes higher than the densification temperature of the coarse-grain high goethite ore, which is later than the densification of the coarse-grain high goethite ore. Produces a calcium-ferrite melt. Therefore, in any case, the above melt cannot be generated when the coarse-grained high goethite ore is densified, and the sintering quality deteriorates.
【００３１】また、細粒高ゲーサイト鉱石粉の３０〜３
％は該細粒高ゲーサイト鉱石粉と石灰石の割合が１５〜
８５％であることから決まる値である。Fine grain high goethite ore powder 30 to 3
% Is the ratio of the fine grain high goethite ore powder and limestone is 15 to
It is a value determined from being 85%.
【００３２】尚、上記のように本発明は１ｍｍ以下を主
体とする細粒原料及び２ｍｍ以上を主体とする粗粒高ゲ
ーサイト鉱石を各々別々のホッパーより切り出してドラ
ムミキサーに導入するものであるが、この各ホッパーよ
り切り出す各原料、つまり、細粒原料としての蛇紋岩、
石灰石、細粒高ゲーサイト鉱石粉の全て（１００％）が
１ｍｍ以下、更に、粗粒高ゲーサイト鉱石の全てが２ｍ
ｍ以上であると、第２ドラムミキサーでの造粒歩留りが
極めて良好になる反面、整粒（破砕、分級）のための設
備コストが高くなる。As described above, according to the present invention, the fine-grain raw material mainly containing 1 mm or less and the coarse-grain high goethite ore mainly containing 2 mm or more are cut out from separate hoppers and introduced into the drum mixer. However, each raw material cut out from each hopper, that is, serpentine as a fine grain raw material,
All limestone and fine grain high goethite ore powder (100%) are 1 mm or less, and further, coarse grain high goethite ore powder is 2 m
When it is m or more, the granulation yield in the second drum mixer is extremely good, but the equipment cost for sizing (crushing, classification) is high.
【００３３】このことから、実操業においては、前記細
粒部の各原料の粒度は５ｍｍ以下のもので、この中で１
ｍｍ以下が７０％程度、前記粗粒部の高ゲーサイト鉱石
の粒度は１０ｍｍ以下のもので、この中で２ｍｍ以上が
８０％程度とすることが、造粒歩留りを大幅に低下する
ことなく、整粒設備コストを安価とすることが出来好ま
しい。From this, in actual operation, the grain size of each raw material in the fine grain portion is 5 mm or less.
mm or less is about 70%, and the grain size of the high goethite ore in the coarse grain portion is 10 mm or less. Among them, setting 2 mm or more to about 80% does not significantly reduce the granulation yield, It is preferable because the cost of sizing equipment can be reduced.
【００３４】更に、第１ドラムミキサーからの擬似粒化
物（通常の焼結原料）４０〜９５％と、第２ドラムミキ
サーからの被覆粒化物の配合割合を５〜６０％とするの
は、被覆粒化物の配合割合が６０％超になると焼結鉱の
品質が劣化し、これを装入して操業する高炉に悪影響を
与える。又、５％未満になるとその量が少なくなり設備
的の見合わないものとなる。Further, the mixing ratio of pseudo granules (normal sintering raw material) from the first drum mixer 40 to 95% and the coating granules from the second drum mixer to 5 to 60% means that the coating is If the blending ratio of the granules exceeds 60%, the quality of the sintered ore deteriorates, which adversely affects the blast furnace that is charged with and operates. On the other hand, if it is less than 5%, the amount becomes small and the equipment becomes unsuitable.
【００３５】また、前記被覆造粒物を焼結するには結晶
水、水分を飛散させると共に被覆層を溶融させなければ
ならず、多量の熱源が必要となる。Further, in order to sinter the coated granulated product, crystallization water and water must be scattered and the coating layer must be melted, and a large amount of heat source is required.
【００３６】このことから、第２ドラムミキサーに導入
する前記細粒原料中に熱源となる１ｍｍ以下の固体燃料
（コークス、無煙炭）を１６％以下、好ましくは１０％
を配合し、被覆層内に該固体燃料を含有することが、被
覆造粒物を均等に、しかも、効率的に焼結することが可
能となり好ましい。From the above, solid fuel (coke, anthracite) having a size of 1 mm or less, which serves as a heat source, in the fine grain raw material introduced into the second drum mixer is 16% or less, preferably 10%.
It is preferable that the solid fuel is mixed and the solid fuel is contained in the coating layer because the coated granules can be uniformly and efficiently sintered.
【００３７】しかし、この固体燃料の配合割合を被覆造
粒物量の１６％以上とすると、焼結ベット上で被覆造粒
物が熱過剰となり、被覆造粒物の核としての２ｍｍ以上
の高ゲーサイト鉱石が溶融することがあり、細粒原料で
２ｍｍ以上の高ゲーサイト鉱石を被覆する効果がなくな
る。However, if the blending ratio of this solid fuel is set to 16% or more of the amount of the coated granules, the coated granules become excessive in heat on the sintering bed, and a high game of 2 mm or more as a core of the coated granules. The site ore may melt, and the effect of coating the high goethite ore of 2 mm or more with the fine grain raw material is lost.
【００３８】この際における細粒原料の配合割合は固体
燃料の配合割合をＸとすると、〔１−Ｘ〕を前記配合割
合で構成したものでよい。つまり、固体燃料の配合割合
をＸとすると、蛇紋岩は〔７５×（１００−Ｘ）〕〜
〔３５×（１００−Ｘ）〕％、石灰石は〔４５×（１０
０−Ｘ）〕〜〔２２×（１００−Ｘ）〕％、高ゲーサイ
ト鉱石粉は〔３０×（１００−Ｘ）〕〜〔３×（１００
−Ｘ）〕％である。At this time, when the mixing ratio of the solid fuel is X, the mixing ratio of the fine-grain raw material may be [1-X] having the above-mentioned mixing ratio. That is, when the blending ratio of solid fuel is X, serpentine is [75 x (100-X)] ~
[35 x (100-X)]%, limestone is [45 x (10-X)]%
0-X)] to [22 × (100-X)]%, and high goethite ore powder is [30 × (100-X)] to [3 × (100
-X)]%.
【００３９】尚、この配合割合にするのは上記の理由と
同一である。The reason for setting this blending ratio is the same as above.
【００４０】又、被覆造粒物の細粒原料の原料銘柄が変
化すると焼結原料の品質が変化する場合があり、この際
は、擬似粒化物に混合する固体燃料比率を１６％以下の
範囲内で調製することが好ましいが、このときは、被覆
造粒物の混合する固体燃料量分に相当する量だけ擬似粒
化物に混合する固体燃料量を低減することが安定した品
質の焼結鉱が製造出来るので好ましい。Further, the quality of the sintering raw material may change when the raw material brand of the fine-grain raw material of the coated granulation changes, and in this case, the solid fuel ratio mixed with the pseudo-granulated product is within the range of 16% or less. In this case, it is preferable to reduce the amount of solid fuel mixed in the pseudo-granulated product by an amount corresponding to the amount of solid fuel mixed in the coated granulation. Is preferable because it can be produced.
【００４１】又、前記高ゲーサイト鉱石の粒径を１０ｍ
ｍ以上にすると細粒原料で被覆した状態の被覆造粒物の
粒径が大きくなり、更に、これを焼結パレット上に装入
すると、その殆どが最下層に偏析する結果、前記被覆造
粒物を焼成するための融液源が不足傾向となり、焼結鉱
品質が低下することから、高ゲーサイト鉱石の粒径を１
０ｍｍ以下にすることが好ましい。Further, the grain size of the high goethite ore is set to 10 m.
When it is more than m, the particle size of the coated granule in a state of being coated with the fine-grain raw material becomes large, and when this is put on a sintering pallet, most of it segregates to the bottom layer, resulting in the above-mentioned coated granule. The particle size of high goethite ore is 1
It is preferably 0 mm or less.
【００４２】[0042]
【実施例】本発明の一実施例を図１を参照して説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG.
【００４３】高ゲーサイト鉱石ホッパー１ａより造粒核
となる２ｍｍ以上を主体（８０％以上含有）とする粗粒
高ゲーサイト鉱石を切り出す。From the high goethite ore hopper 1a, coarse grain high goethite ore mainly containing 2 mm or more (containing 80% or more), which is a granulation nucleus, is cut out.
【００４４】更に、１ｍｍ以下を主体とする細粒原料と
して、ＭｇＯ−ＳｉＯ2 系原料ホッパー１ｂより１ｍ
ｍ以下を８０％以上有する蛇紋岩又は橄欖岩と、Ｃａ
Ｏ系原料ホッパー１ｃより１ｍｍ以下を７０％以上有す
る石灰石と、ヘマタイト鉱石ホッパー１ｄより１ｍｍ
以下を７０％以上有する高ゲーサイト鉱石粉又は赤鉄鉱
と、燃料ホッパー１ｅより燃料として１ｍｍ以下を８
０％以上有する粉コークスを各々別々に切り出す。そし
て、この切り出した原料をベルトコンベアー６ａを介し
て造粒用第２ドラムミキサー２（直径：５ｍ、長さ：２
５ｍ、回転数：６ｒｐｍ、滞留時間：５分間）に導入す
る。Further, as a fine-grain raw material mainly having a size of 1 mm or less, 1 m from the MgO-SiO 2 -based raw material hopper 1b.
Serpentine or olivine having 80% or more of m or less, and Ca
Limestone having 70% or more of 1 mm or less from O-based raw material hopper 1c and 1 mm from hematite ore hopper 1d
High goethite ore powder or hematite having 70% or more of the following, and 8 mm or less as fuel from the fuel hopper 1e.
Coke powder having 0% or more is cut out separately. Then, the cut-out raw material is passed through the belt conveyor 6a to the second drum mixer 2 for granulation (diameter: 5 m, length: 2).
5 m, rotation speed: 6 rpm, residence time: 5 minutes).
【００４５】この際の高ゲーサイト鉱石、蛇紋岩、橄欖
岩、赤鉄鉱、石灰石の成分を表１に示し、表２、表３に
前記ベルトコンベアー６ａ上に於ける各原料の粒度別配
合重量割合、及び１ｍｍ以下の細粒原料における塩基度
を示す。The components of the high goethite ore, serpentine, apatite, hematite, and limestone at this time are shown in Table 1, and in Tables 2 and 3, the weight of each raw material on the belt conveyor 6a is compounded by weight. The ratio and the basicity of the fine-grain raw material of 1 mm or less are shown.
【００４６】[0046]
【表１】 [Table 1]
【００４７】[0047]
【表２】 [Table 2]
【００４８】[0048]
【表３】 [Table 3]
【００４９】表２中、本発明例Ｉ〜ＩＩＩは高ゲーサイ
ト鉱石ホッパー１ａより粗粒高ゲーサイト鉱石、ＭｇＯ
−ＳｉＯ2 系原料ホッパー１ｂより蛇紋岩、ＣａＯ系原
料ホッパー１ｃより石灰石、ヘマタイト鉱石ホッパー１
ｄより高ゲーサイト鉱石粉、燃料ホッパー１ｅより粉コ
ークスを各々切り出して、第２ドラムミキサー２で造粒
した場合である。In Table 2, Examples I to III of the present invention are coarse grained high goethite ore, MgO higher than the high goethite ore hopper 1a.
-Serpentine from SiO 2 based material hopper 1b, Limestone from CaO based material hopper 1c, hematite ore hopper 1
Higher goethite ore powder than d and powder coke from the fuel hopper 1e are cut out and granulated by the second drum mixer 2.
【００５０】本発明例ＩＶは高ゲーサイト鉱石ホッパー
１ａより粗粒高ゲーサイト鉱石、ＭｇＯ−ＳｉＯ2 系原
料ホッパー１ｂより蛇紋岩、ＣａＯ系原料ホッパー１ｃ
より石灰石、燃料ホッパー１ｅより粉コークスを各々切
り出して、第２ドラムミキサー２で造粒し、１ｍｍ以下
の高ゲーサイト鉱石粉を高ゲーサイト鉱石ホッパー１ａ
より切り出した粗粒高ゲーサイト鉱石中に含まれている
細粒分で賄った場合である。Inventive Example IV is coarse-grained high goethite ore from the high goethite ore hopper 1a, serpentine from the MgO—SiO 2 -based raw material hopper 1b, and CaO-based raw material hopper 1c.
More limestone and powder coke are cut out from the fuel hopper 1e, granulated by the second drum mixer 2, and high goethite ore powder of 1 mm or less is turned into the high goethite ore hopper 1a.
This is the case when the fine grains contained in the coarse-grained high goethite ore cut out are covered.
【００５１】本発明例Ｖは高ゲーサイト鉱石ホッパー１
ａより２ｍｍ未満を含まない粗粒高ゲーサイト鉱石、Ｍ
ｇＯ−ＳｉＯ2 系原料ホッパー１ｂより１ｍｍ超を含ま
ない蛇紋岩、ＣａＯ系原料ホッパー１ｃより１ｍｍ超を
含まない石灰石、ヘマタイト鉱石ホッパー１ｄより１ｍ
ｍ超を含まない高ゲーサイト鉱石粉を各々切り出して、
第２ドラムミキサー２で造粒した場合である。Inventive Example V is a high goethite ore hopper 1
Coarse-grained high goethite ore not containing less than 2 mm from a, M
Serpentine that does not contain more than 1 mm from the gO-SiO 2 -based raw material hopper 1b, limestone that does not contain more than 1 mm from the CaO-based raw material hopper 1c, and 1 m from the hematite ore hopper 1d.
Cut out each high goethite ore powder that does not contain more than m,
This is the case where granulation is performed by the second drum mixer 2.
【００５２】本発明例ＶＩは高ゲーサイト鉱石ホッパー
１ａより２ｍｍ未満を含まない粗粒高ゲーサイト鉱石、
ＭｇＯ−ＳｉＯ2 系原料ホッパー１ｂより蛇紋岩、Ｃａ
Ｏ系原料ホッパー１ｃより石灰石、ヘマタイト鉱石ホッ
パー１ｄより赤鉄鉱、燃料ホッパー１ｅよりコークス粉
を各々切り出して、第２ドラムミキサー２で造粒した場
合である。Inventive Example VI is a coarse grained high goethite ore containing less than 2 mm less than the high goethite ore hopper 1a,
Serpentine, Ca from the MgO-SiO 2 raw material hopper 1b
This is a case where limestone is cut out from the O-based raw material hopper 1c, hematite is cut out from the hematite ore hopper 1d, and coke powder is cut out from the fuel hopper 1e and granulated by the second drum mixer 2.
【００５３】本発明例ＶＩＩは高ゲーサイト鉱石ホッパ
ー１ａより粗粒高ゲーサイト鉱石、ＭｇＯ−ＳｉＯ2 系
原料ホッパー１ｂより橄欖岩、ＣａＯ系原料ホッパー１
ｃより石灰石、ヘマタイト鉱石ホッパー１ｄより高ゲー
サイト鉱石粉、燃料ホッパー１ｅより粉コークスを各々
切り出して、第２ドラムミキサー２で造粒した場合であ
る。Inventive Example VII is a coarse goethite ore from the high goethite ore hopper 1a, an agglomerite from the MgO--SiO 2 -based raw material hopper 1b, and a CaO-based raw material hopper 1.
This is the case where limestone from c, high goethite ore powder from the hematite ore hopper 1d, and coke powder from the fuel hopper 1e are cut out and granulated by the second drum mixer 2.
【００５４】本発明例ＶＩＩＩは粗粒高ゲーサイト鉱石
の配合比率を増大した場合である。即ち、高ゲーサイト
鉱石ホッパー１ａより粗粒高ゲーサイト鉱石、ＭｇＯ−
ＳｉＯ2 系原料ホッパー１ｂより蛇紋岩、ＣａＯ系原料
ホッパー１ｃより石灰石、ヘマタイト鉱石ホッパー１ｄ
より高ゲーサイト鉱石粉、燃料ホッパー１ｅよりコーク
ス粉を各々切り出して、第２ドラムミキサー２で造粒し
た場合である。Inventive Example VIII is the case where the compounding ratio of the coarse-grained high goethite ore is increased. That is, the coarse-grained high goethite ore, MgO-
Serpentine from the SiO 2 -based raw material hopper 1b, limestone from the CaO-based raw material hopper 1c, and hematite ore hopper 1d
This is the case where the higher goethite ore powder and the coke powder are cut out from the fuel hopper 1e and granulated by the second drum mixer 2.
【００５５】本発明例ＩＸは１０ｍｍ以上の粒径の高ゲ
ーサイト鉱石を全く含まない場合で、その他は本発明例
ＩＶと同一である。これは本発明例ＩＶに比較して、焼
結鉱特性が良好となっている。Inventive Example IX was the same as Inventive Example IV except that it contained no high goethite ore having a particle size of 10 mm or more. This has a better sinter ore property as compared with Invention Example IV.
【００５６】尚、上記粗粒部の高ゲーサイト鉱石中に１
ｍｍ以下の高ゲーサイト鉱石粉が適正量（配合する１ｍ
ｍ以下の石灰石の１５％以上）混在しているものを使用
した場合には、本発明例ＩＶのようにヘマタイト含有鉱
石ホッパー１ｄを設ける必要がなく経済的である。In the coarse goethite high goethite ore, 1
An appropriate amount of high goethite ore powder of less than mm (1m to be mixed)
It is economical to use a hematite-containing ore hopper 1d as in the case of the invention example IV when using a mixture of 15% or more of m or less limestone (15% or more).
【００５７】更に、この造粒用第２ドラムミキサー２
で、水分を表２、表３の条件で加えて原料のトータル水
分を調整し、該造粒用ドラムミキサー２で造粒する。Further, the second drum mixer 2 for granulation
Then, water is added under the conditions shown in Tables 2 and 3 to adjust the total water content of the raw material, and granulation is performed by the granulation drum mixer 2.
【００５８】このように２ｍｍ以上、１ｍｍ以下の両高
ゲーサイト鉱石と蛇紋岩、石灰石、コークスは造粒用第
２ドラムミキサー２で造粒されて、２ｍｍ以上の高ゲー
サイト鉱石を核としてその周囲に１ｍｍ以下の各蛇紋
岩、高ゲーサイト鉱石粉、石灰石、コークスの細粒原料
が付着して造粒物となる。As described above, both high goethite ores of 2 mm or more and 1 mm or less, serpentine, limestone and coke are granulated by the second drum mixer 2 for granulation, and the high goethite ores of 2 mm or more are used as nuclei. Around 1 mm or less of each serpentine, high goethite ore powder, limestone, and coke fine-grain raw material adhere to form a granulated product.
【００５９】一方、各ホッパー１ｆ〜１ｉから、表１に
示す成分を有する通常の焼結原料として使用する鉄鉱石
としての均鉱、副原料としての石灰石、固体燃料として
の粉コークス、さらには返し鉱等のその他の原料を表４
に示す配合割合で切り出して第１ドラムミキサー３に装
入し、水分を加え造粒して擬似粒子化する。On the other hand, from each of the hoppers 1f to 1i, soaking ore as an iron ore used as a usual sintering raw material having the components shown in Table 1, limestone as an auxiliary raw material, powder coke as a solid fuel, and further return Table 4 shows other raw materials such as ore
The mixture is cut out at the compounding ratio shown in (1), charged into the first drum mixer 3, and added with water to granulate to form pseudo particles.
【００６０】[0060]
【表４】 [Table 4]
【００６１】そしてこの第１ドラムミキサー３から払出
した擬似粒化物を、ベルトコンベアー６ｄ、６ｅにより
焼結ベッド５上に設けたサージホッパー４へ搬送する。The pseudo-granulated product discharged from the first drum mixer 3 is conveyed to the surge hopper 4 provided on the sintering bed 5 by the belt conveyors 6d and 6e.
【００６２】この搬送途中で、前記第２ドラムミキサー
２で造粒してベルトコンベアー６ｃで搬送されて来た２
ｍｍ以上の高ゲーサイト鉱石を、細粒原料で被覆した造
粒物を乗せて搬送する。During this transportation, the granules were granulated by the second drum mixer 2 and transported by the belt conveyor 6c.
A high goethite ore having a diameter of mm or more is placed on a granulated material coated with a fine-grain raw material and conveyed.
【００６３】更に該造粒物と擬似粒化物は、ベルトコン
ベアー６ｄ、６ｅの乗継部及びサージホッパー４に装入
される際に落下して混合される。Further, the granulated material and the pseudo-granulated material are dropped and mixed when they are charged into the connecting portions of the belt conveyors 6d and 6e and the surge hopper 4.
【００６４】このサージホッパー４より所定量の造粒物
と擬似粒化物を切り出して焼結ベッド５に装入する。A predetermined amount of granulated material and pseudo-granulated material are cut out from the surge hopper 4 and charged into the sintering bed 5.
【００６５】このサージホッパー４直下の焼結ベッド５
上における造粒物をサンプリングして、該造粒物の被覆
細粒原料の被覆層厚、配合割合及び水分、塩基度、粒
度、Ｉ型強度を測定した結果を表２、表３に示す。The sintering bed 5 directly below the surge hopper 4
Tables 2 and 3 show the results obtained by sampling the above granulated product and measuring the coating layer thickness, blending ratio and water content, basicity, particle size and I-type strength of the coated fine granule raw material of the granulated product.
【００６６】かくして焼結原料を焼結ベッド上で焼結し
た結果、表２、表３に示す特性を有する焼結鉱を製造す
ることが出来た。Thus, as a result of sintering the sintering raw material on the sintering bed, a sintered ore having the characteristics shown in Tables 2 and 3 could be manufactured.
【００６７】表２、表３と表５、表６からわかるよう
に、本発明例は比較例に比して良好な焼結鉱特性を有す
る。As can be seen from Tables 2 and 3 and Tables 5 and 6, the examples of the present invention have better sinter characteristics than the comparative examples.
【００６８】[0068]
【表５】 [Table 5]
【００６９】[0069]
【表６】 [Table 6]
【００７０】表５に示す比較例Ｉは１ｍｍ以下主体の細
粒原料と２ｍｍ以上主体の高ゲーサイト鉱石の配合割
合、及び、ヘマタイト含有鉱石とＣａＯ系原料の配合重
量割合、コークス粉の配合割合が本発明の範囲から外れ
た場合の例である。In Comparative Example I shown in Table 5, the mixing ratio of the fine-grain raw material mainly containing 1 mm or less and the high goethite ore mainly containing 2 mm or more, the mixing weight ratio of the hematite-containing ore and the CaO-based raw material, and the mixing ratio of coke powder were used. Is an example of a case outside the scope of the present invention.
【００７１】比較例ＩＩは上記石灰石に対してヘマタイ
ト含有鉱石の配合重量割合及び１ｍｍ以下主体の細粒原
料の塩基度が本発明の範囲から外れた場合の例である。Comparative Example II is an example in which the blending weight ratio of the hematite-containing ore to the limestone and the basicity of the fine-grain raw material mainly containing 1 mm or less were out of the range of the present invention.
【００７２】比較例ＩＩＩ〜Ｖは細粒原料の水分が本発
明の範囲から外れた場合の例である。Comparative Examples III to V are examples in which the water content of the fine grain raw material is out of the range of the present invention.
【００７３】比較例ＶＩ、ＶＩＩＩは造粒物と擬似粒化
焼結鉱原料の混合割合が本発明の範囲から外れた場合の
例である。Comparative Examples VI and VIII are examples in which the mixing ratio of the granulated product and the pseudo-granulated sinter raw material is out of the range of the present invention.
【００７４】比較例ＶＩＩは２ｍｍ以上の高ゲーサイト
鉱石に対する１ｍｍ以下の細粒原料の配合割合及び１ｍ
ｍ以下主体の細粒原料の塩基度が本発明の範囲から外れ
た場合の例である。In Comparative Example VII, the mixing ratio of the fine grain raw material of 1 mm or less to the high goethite ore of 2 mm or more and 1 m
This is an example in which the basicity of the fine-grain raw material mainly containing m or less is out of the range of the present invention.
【００７５】尚、本実施例の造粒用第２ドラムミキサー
２と第１ドラムミキサー３に供給する石灰石とコークス
を各々の粒度に区分することが好ましいが、分級装置等
が必要となり、設備及びメンテナンス費用が高価となる
ことからこれを回避するため１ｍｍ以下の石灰石、コー
クスを含んだ同一のものを使用しても実用上差支えな
い。Incidentally, it is preferable to classify the limestone and the coke to be supplied to the second drum mixer 2 for granulation and the first drum mixer 3 of the present embodiment into respective particle sizes, but a classifier or the like is required, and equipment and Since maintenance costs are high, in order to avoid this, it is practically acceptable to use the same one containing 1 mm or less of limestone and coke.
【００７６】[0076]
【発明の効果】以上に説明したように本発明は、従来焼
結原料として多量に使用することが困難であった２ｍｍ
以上の高ゲーサイト鉱石を、その表面に１ｍｍ以下の含
ＭｇＯ−ＳｉＯ2 系原料及びヘマタイト含有系原料、Ｃ
ａＯ系原料、固体燃料からなる細粒原料で被覆して、焼
結原料中のＣａＯ−Ｆｅ2 Ｏ3 と同化することを防止す
ると共に造粒物相互、造粒物と周囲の通常の焼結鉱と容
易に結合することによって、焼結ベッド上に偏析装入し
ても焼結鉱の生産性、歩留、品質を低下させることなく
多量に使用することができ、また、所定粒度の核となる
べき粗粒高ゲーサイト鉱石と、付着粉と成るべき所定粒
度の細粒原料を組み合わせると共に、水分量を所定範囲
に調整することにより、セメント、タール等のバインダ
ー類を添加することなく造粒することができるので、焼
結鉱製造コストを大幅に低減することができる等、多大
な効果を奏する。As described above, according to the present invention, it has been difficult to use a large amount as a sintering raw material in the conventional case of 2 mm.
On the surface of the above high goethite ore, 1 mm or less of MgO-SiO 2 -based raw material and hematite-containing raw material, C
aO-based material, coated with fine material consisting of solid fuel, the granules each other, granules and the surrounding is prevented from being merged with CaO-Fe 2 O 3 in the sintered material conventional sintering By easily combining with the ore, it can be used in a large amount without degrading the productivity, yield and quality of the sintered ore even if it is segregated and charged on the sintering bed. Coarse-grained high goethite ore and fine-grained raw material with a predetermined grain size that should form adhering powder are combined, and by adjusting the water content within a predetermined range, it is possible to produce without adding binders such as cement and tar. Since the particles can be granulated, the production cost of the sinter can be greatly reduced, and other great effects can be obtained.
【図１】本発明の実施例の設備フロー図である。FIG. 1 is an equipment flow diagram of an embodiment of the present invention.
【図２】蛇紋岩被覆層のＩ型強度と水分量との関係を示
す図である。FIG. 2 is a diagram showing the relationship between the I-type strength and the water content of a serpentine coating layer.
【図３】焼結ベッド内の蛇紋岩被覆層厚と水分量との関
係を示す図である。FIG. 3 is a diagram showing a relationship between a serpentine coating layer thickness and a water content in a sintering bed.
１ａ 高ゲーサイト鉱石ホッパー １ｂ ＭｇＯ−ＳｉＯ2 系原料ホッパー １ｃ ＣａＯ系原料ホッパー １ｄ ヘマタイト含有鉱石ホッパー １ｅ 燃料ホッパー １ｆ 均鉱ホッパー １ｇ 石灰石ホッパー １ｈ 粉コークスホッパー １ｉ 返鉱ホッパー ２ 造粒用第２ドラムミキサー ３ 第１ドラムミキサー ４ サージホッパー ５ 焼結ベッド ６ａ〜ｅ ベルトコンベアー1a High goethite ore hopper 1b MgO-SiO 2 based material hopper 1c CaO based material hopper 1d hematite ores hopper 1e fuel hopper 1f Hitoshiko hopper 1g limestone hopper 1h coke fines hopper 1i return ores hopper 2 granulating second drum mixer 3 1st drum mixer 4 Surge hopper 5 Sintering bed 6a-e Belt conveyor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 安藤 啓司 大分県大分市大字西ノ洲１ 新日本製鐵株 式会社大分製鐵所内 (72)発明者 出野 正 大分県大分市大字西ノ洲１ 新日本製鐵株 式会社大分製鐵所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Keiji Ando 1 Nishinosu, Oita-shi, Oita Pref. Nippon Steel Co., Ltd. Inside Oita Steel Works (72) Tadashi Deno 1 Nishinozu, Oita-shi, Oita Pref. Oita Works, a steel stock company
Claims (3)
キサーで混合造粒して平均粒径が２〜３ｍｍに擬似粒化
した擬似粒化物を製造すると共に粒径２ｍｍ以上を主体
とする高ゲーサイト鉱石及び粒径１ｍｍ以下を主体とす
る細粒原料を前記第１ミキサーとは別に設けた造粒用第
２ミキサーに導入して、水を添加して造粒し、該造粒物
と前記擬似粒化物とを焼結機に供給する高炉用焼結鉱原
料の事前処理方法において、造粒用第２ミキサーに導入
する前記細粒原料を２０〜６０重量％、前記粒径２ｍｍ
以上を主体とする高ゲーサイト鉱石を４０〜８０重量
％、水分を外掛けで８〜１４重量％にすると共に、前記
細粒原料としてＭｇＯ−ＳｉＯ2 系原料、ＣａＯ系原
料、ヘマタイト含有鉱石を主体とし、しかも、該ヘマタ
イト含有鉱石がＣａＯ系原料の１５〜８５重量％で、且
つ、塩基度を０．４〜１．４とし、更に、第２ミキサー
からの造粒物５〜６０重量％、前記第１ミキサーからの
擬似粒化物４０〜９５重量％にして焼結機に供給するこ
とを特徴とする高炉用焼結鉱原料の事前処理方法。1. An iron ore, an auxiliary raw material, and a solid fuel are mixed and granulated by a first mixer to produce a pseudo-granulated product having an average particle size of 2 to 3 mm, and a particle size of 2 mm or more is mainly used. The high goethite ore and a fine-grain raw material mainly having a grain size of 1 mm or less are introduced into a second mixer for granulation provided separately from the first mixer, and water is added to perform granulation. In a pretreatment method of a sinter ore raw material for a blast furnace, which supplies a product and the pseudo-granulated product to a sintering machine, the fine-grain raw material to be introduced into a second granulating mixer is 20 to 60% by weight, and the particle diameter is 2 mm
40-80% by weight of high goethite ore mainly composed of the above, and 8-14% by weight of water externally, and MgO-SiO 2 -based raw material, CaO-based raw material, or hematite-containing ore as the fine grain raw material. Mainly, the hematite-containing ore is 15 to 85% by weight of the CaO-based raw material, the basicity is 0.4 to 1.4, and further the granulated product from the second mixer is 5 to 60% by weight. A pretreatment method for a sinter ore raw material for a blast furnace, which comprises supplying the pseudo-granulated product from the first mixer in an amount of 40 to 95% by weight to a sinter machine.
他に１ｍｍ以下を主体とする固体燃料を１６重量％以下
配合することを特徴とする請求項１記載の高炉用焼結鉱
原料の事前処理方法。2. The sinter raw material for blast furnace according to claim 1, characterized in that, as the fine-grain raw material, 16 wt% or less of a solid fuel mainly having a diameter of 1 mm or less is blended in addition to the raw materials of the above-mentioned types. Pretreatment method.
することを特徴とする請求項１または２記載の高炉用焼
結鉱原料の事前処理方法。3. The pretreatment method for a sinter ore raw material for a blast furnace according to claim 1, wherein the high goethite ore is set to 2 to 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25199492A JP2589633B2 (en) | 1991-11-08 | 1992-08-28 | Pre-treatment method of sinter ore raw material for blast furnace |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-319662 | 1991-11-08 | ||
| JP31966291 | 1991-11-08 | ||
| JP25199492A JP2589633B2 (en) | 1991-11-08 | 1992-08-28 | Pre-treatment method of sinter ore raw material for blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05195088A true JPH05195088A (en) | 1993-08-03 |
| JP2589633B2 JP2589633B2 (en) | 1997-03-12 |
Family
ID=26540481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25199492A Expired - Lifetime JP2589633B2 (en) | 1991-11-08 | 1992-08-28 | Pre-treatment method of sinter ore raw material for blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2589633B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005350770A (en) * | 2004-05-13 | 2005-12-22 | Nippon Steel Corp | Method for pretreating raw material for sintering |
| JP2008057028A (en) * | 2006-09-04 | 2008-03-13 | Sumitomo Metal Ind Ltd | Method for manufacturing sintered ore |
-
1992
- 1992-08-28 JP JP25199492A patent/JP2589633B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005350770A (en) * | 2004-05-13 | 2005-12-22 | Nippon Steel Corp | Method for pretreating raw material for sintering |
| JP2008057028A (en) * | 2006-09-04 | 2008-03-13 | Sumitomo Metal Ind Ltd | Method for manufacturing sintered ore |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2589633B2 (en) | 1997-03-12 |
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