JPH08199249A - Agglomerated ore for steelmaking - Google Patents
Agglomerated ore for steelmakingInfo
- Publication number
- JPH08199249A JPH08199249A JP2446395A JP2446395A JPH08199249A JP H08199249 A JPH08199249 A JP H08199249A JP 2446395 A JP2446395 A JP 2446395A JP 2446395 A JP2446395 A JP 2446395A JP H08199249 A JPH08199249 A JP H08199249A
- Authority
- JP
- Japan
- Prior art keywords
- carbonaceous material
- core
- agglomerated ore
- iron
- ore
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
(57)【要約】
【目的】 高炉および鋼スクラップを溶解する炉の操業
において、被還元性を改善し、鉄中または溶湯中に効率
良く浸炭して溶解性を改善する製鉄用塊成鉱を提供す
る。
【構成】 本発明の製鉄用塊成鉱は炭材２１を核とし、
核を内包する外周層は鉄原料２３と炭材２２との混合物
からなる。核としての炭材２１の体積分率は塊成鉱全体
の０．２〜３０ｖｏｌ％の範囲内とし、外周層中の鉄原
料２３と炭材２２の混合物中の炭材２２の重量割合は５
〜２５ｗｔ％とするのが好ましい。また、核としての炭
材２１の粒径は３〜２５ｍｍ、外周層中の炭材２２およ
び鉄原料２３の粒径は１ｍｍ以下で、そのうち４４μｍ
以下が３０％以上であることが好ましい。
(57) [Summary] [Purpose] In the operation of blast furnaces and furnaces for melting steel scrap, an agglomerated ore for ironmaking that improves reducibility and efficiently carburizes in iron or molten metal to improve solubility. provide. [Structure] The agglomerated ore for iron making of the present invention has a carbonaceous material 21 as a core,
The outer peripheral layer containing the core is made of a mixture of the iron raw material 23 and the carbonaceous material 22. The volume fraction of the carbonaceous material 21 as a core is within the range of 0.2 to 30 vol% of the whole agglomerated ore, and the weight ratio of the carbonaceous material 22 in the mixture of the iron raw material 23 and the carbonaceous material 22 in the outer peripheral layer is 5%.
It is preferably about 25 wt%. The particle size of the carbonaceous material 21 as the core is 3 to 25 mm, and the particle size of the carbonaceous material 22 and the iron raw material 23 in the outer peripheral layer is 1 mm or less, of which 44 μm.
The following is preferably 30% or more.
Description
【０００１】[0001]
【産業上の利用分野】本発明は製鉄用原料、特に高炉ま
たは竪型スクラップ溶解炉で使用する高被還元性の製鉄
用塊成鉱に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material for ironmaking, particularly to a highly reducible agglomerate for ironmaking used in a blast furnace or a vertical scrap melting furnace.
【０００２】[0002]
【従来の技術】製鉄用原料には大別して焼成鉱と非焼成
塊成鉱とがある。焼成鉱としては焼結鉱とペレットが代
表的であり、非焼成塊成鉱にはコールドボンドペレット
などがある。2. Description of the Related Art Ironmaking raw materials are roughly classified into calcined ores and non-calcined agglomerated ores. Sintered ore and pellets are typical as calcined ores, and cold-bonded pellets and the like are examples of non-calcined agglomerated ores.
【０００３】これらの製鉄用原料については強度や被還
元性が重要視され、これまで焼結鉱やペレットの品質改
善が進められてきている。With respect to these raw materials for iron making, importance is attached to strength and reducibility, and improvement of quality of sinter or pellets has been promoted so far.
【０００４】一方、当初は所内ダストの処理を目的とし
て非焼成塊成鉱の開発が進められた。非焼成塊成鉱はセ
メント等の水硬性結合剤、或いはγ−ＣａＯ・ＳｉＯ2
のようなＣＯ2 ガス硬化剤によりペレット化、ブリケッ
ト化、或いはロール成型して塊成化する。また、被還元
性の改善を目的として、炭材を含有した非焼成塊成鉱が
開発されている。「鉄と鋼」、６９（１９８３）、Ｓ７
８０には、非焼成塊成鉱中の炭材内装量は５〜８％程度
であると記載されている。On the other hand, initially, the development of a non-calcined agglomerated ore was promoted for the purpose of treating the in-house dust. Non-calcined agglomerated ore is a hydraulic binder such as cement, or γ-CaO ・ SiO 2
Pelletizing, briquetting, or roll-molding with a CO 2 gas curing agent as described above to agglomerate. Further, a non-calcined agglomerated ore containing carbonaceous material has been developed for the purpose of improving the reducibility. "Iron and Steel," 69 (1983), S7
80 describes that the amount of the carbonaceous material contained in the non-fired agglomerated ore is about 5 to 8%.
【０００５】しかし、炉内のガス利用率ηCO＝ＣＯ2 ／
（ＣＯ＋ＣＯ2 ）が４０〜５０％である竪型スクラップ
溶解炉に、炭材内装量５ｗｔ％程度の非焼成塊成鉱を全
鉄源中１０％使用した場合、非焼成塊成鉱の還元はほと
んど進行しなかった。これは、非焼成塊成鉱の周囲のガ
ス利用率ηCOは平衝論的にはＦｅＯ→Ｆｅへの還元が進
まないガス濃度であることに加え、非焼成塊成鉱中に含
有される炭材が還元に有効に活用されなかったことを示
唆する。However, the gas utilization rate in the furnace η CO = CO 2 /
When 10% of unburned agglomerated ore with a carbonaceous material content of about 5 wt% is used in the total iron source in a vertical scrap melting furnace with (CO + CO 2 ) of 40 to 50%, reduction of the unfired agglomerated ore Almost no progress. This is because the gas utilization ratio η CO around the uncalcined agglomerated ore is a gas concentration at which the reduction from FeO to Fe does not proceed in a theoretical theory, and it is contained in the uncalcined agglomerated ore. This suggests that the carbonaceous material was not effectively used for reduction.
【０００６】塊成鉱中に炭材を内装する技術は非焼成塊
成鉱が主であり、焼結鉱製造などのように微粉炭材を燃
焼させてその燃焼熱を利用して焼結する場合には、通常
は焼成鉱中には炭材は残らない。ただし、特開平２−２
３２３２２号公報記載のように、塊成鉱の核に冶金用コ
ークスを使用すると、核のコークスが微粉鉱石中の水分
除去や焼成に一部消費されるが、焼結体中に残留する。
核の周囲部は、バインダーと微粉鉄鉱石が混合された
後、ロータリーキルンで焼成中に焼結してカルシウムフ
ェライト相を主体とする強固な焼結被膜で構成され、炭
材は存在しない。また、核のコークス粒度は１０〜３０
ｍｍ程度であるとされている。[0006] The main technique for incorporating carbonaceous material in agglomerated ore is uncalcined agglomerated ore, and fine carbonaceous materials are burned and sintered using the combustion heat as in the production of sintered ore. In some cases, normally no carbonaceous material remains in the calcined ore. However, Japanese Patent Laid-Open No. 2-2
As described in Japanese Patent No. 32322, when metallurgical coke is used for the core of the agglomerated ore, the coke of the core is partially consumed for removing water in the fine ore and firing, but remains in the sintered body.
The periphery of the nucleus is composed of a strong sintered coating mainly composed of a calcium ferrite phase, which is obtained by mixing the binder and the finely divided iron ore and then sintering the mixture in a rotary kiln during firing, and there is no carbonaceous material. The coke grain size of the core is 10 to 30.
It is said to be about mm.
【０００７】これらの塊成鉱はすべて鉄原料として考え
られている。All of these agglomerates are considered as iron raw materials.
【０００８】一方、高炉内における浸炭挙動に関する研
究としては、オフラインの高炉シミュレーターを用いて
実験した結果が「鉄と鋼」、７０（１９８４）４、Ａ９
に記載されているが、ガスを媒体とする鉄への浸炭速度
は遅く、融着帯内あるいは滴下過程で融液化したメタル
とコークスとの接触によって浸炭が進む。On the other hand, as a study on the carburizing behavior in the blast furnace, the result of an experiment using an off-line blast furnace simulator is "Iron and Steel", 70 (1984) 4, A9.
However, the carburizing rate of iron using gas as a medium is slow, and carburization proceeds by contact between the coke and melted metal in the cohesive zone or during the dropping process.
【０００９】このように、通常の高炉操業では浸炭材は
高価なコークスであり、浸炭の進行によってコークス粒
度の低下や強度低下が生じ、操業に影響を及ぼす。その
ため、浸炭材としてはコークス以外の炭材の使用が望ま
しい。As described above, in a normal blast furnace operation, the carburizing material is expensive coke, and the progress of carburization causes a decrease in coke grain size and a decrease in strength, which affects the operation. Therefore, it is desirable to use carbonaceous materials other than coke as the carburizing material.
【００１０】これまで浸炭速度を制御しようという試み
はないが、もし浸炭制御が可能になれば鉄原料の溶融温
度を制御できるため、融着帯の位置を制御でき、高炉操
業法を改善するための有効な手段となりうる。また、溶
銑を製造する技術として、最近、鋼スクラップの大量溶
解法が開発されつつあるが、この方法の問題点として、
鋼スクラップの難溶解性が挙げられている。鋼スクラッ
プの溶解性を左右する要因としても、浸炭制御が必要で
ある。Although there has been no attempt to control the carburizing rate, if the carburizing control can be performed, the melting temperature of the iron raw material can be controlled, so that the position of the cohesive zone can be controlled and the blast furnace operating method can be improved. Can be an effective means of In addition, as a technique for producing hot metal, recently, a large-scale melting method of steel scrap is being developed, but as a problem of this method,
The poor solubility of steel scrap is mentioned. Carburizing control is also necessary as a factor that affects the solubility of steel scrap.
【００１１】[0011]
【発明が解決しようとする課題】本発明は、高炉および
鋼スクラップを溶解する炉の操業において、被還元性を
改善し浸炭材にもなる塊成鉱を提供することを目的とす
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide an agglomerated ore that improves the reducibility and serves as a carburizing material in the operation of a blast furnace and a furnace for melting steel scrap.
【００１２】[0012]
【課題を解決するための手段】本発明は、炭材を核と
し、核を内包する外周層が鉄原料と炭材の混合物からな
ることを特徴とする製鉄用塊成鉱である。核としての炭
材の体積分率は塊成鉱全体の０．２〜３０ｖｏｌ％と
し、外周層中の炭材の含有率は５〜２５ｗｔ％とするこ
とが好ましい。また、核としての炭材の粒径は３〜２５
ｍｍ、外周層中の炭材および鉄原料の粒径は１ｍｍ以下
で、そのうち４４μｍ以下が３０％以上とすることが好
ましい。The present invention is an agglomerated ore for iron making, characterized in that a carbonaceous material is used as a core, and an outer peripheral layer containing the core is made of a mixture of an iron raw material and a carbonaceous material. The volume fraction of the carbonaceous material as the core is preferably 0.2 to 30 vol% of the whole agglomerated ore, and the carbonaceous material content in the outer peripheral layer is preferably 5 to 25 wt%. The particle size of the carbonaceous material as the core is 3 to 25.
mm, the particle diameter of the carbonaceous material and the iron raw material in the outer peripheral layer is 1 mm or less, of which 44 μm or less is preferably 30% or more.
【００１３】[0013]
【作用】以下、本発明を詳細に説明する。The present invention will be described in detail below.
【００１４】本発明の製鉄用塊成鉱の構成を図１に示
す。The structure of the agglomerated ore for iron making of the present invention is shown in FIG.
【００１５】本塊成鉱は炭材２１を核とし、鉄原料２３
と炭材２２との混合物を核を内包する外周層とする。核
としての炭材２１は浸炭材であり、外周層の炭材２２は
鉄原料の還元材である。そして、核としての炭材２１お
よび外周層の炭材２２の大きさや含有量を調整すること
により、浸炭材としての機能を優先するか、還元材とし
ての機能を優先するかの選択が可能である。This agglomerated ore has a carbonaceous material 21 as a core and an iron raw material 23.
A mixture of the carbonaceous material 22 and the carbonaceous material 22 is used as the outer peripheral layer containing the core. The carbonaceous material 21 as a core is a carburized material, and the carbonaceous material 22 in the outer peripheral layer is a reducing material of iron raw material. Then, by adjusting the size and content of the carbonaceous material 21 as the core and the carbonaceous material 22 of the outer peripheral layer, it is possible to select whether to give priority to the function as the carburizing material or the function as the reducing material. is there.
【００１６】外周層に炭材２２を加えるのは鉄原料の還
元速度を高めるためであり、図２に示すように、炭材の
使用割合を多くすることにより塊成鉱の被還元性を向上
できる。The reason why the carbonaceous material 22 is added to the outer peripheral layer is to increase the reduction rate of the iron raw material. As shown in FIG. 2, increasing the proportion of the carbonaceous material used improves the reducibility of the agglomerated ore. it can.
【００１７】被還元性の改善を目的とした場合、必要な
炭材量は外周層の鉄原料＋炭材の重量当り５〜２５ｗｔ
％である。下限値５ｗｔ％は被還元性の改善効果が認め
られる最少量である。上限値については、炭材量が２５
ｗｔ％超になると塊成鉱の強度が低下する。For the purpose of improving the reducibility, the required amount of carbonaceous material is 5 to 25 wt.
%. The lower limit value of 5 wt% is the minimum amount at which the effect of improving the reducibility is recognized. About the upper limit, the amount of carbonaceous material is 25
If the content exceeds wt%, the strength of the agglomerated ore decreases.
【００１８】核としての炭材２１は、外周層が融液化し
た場合に浸炭源として機能させるために必要である。ま
た、外周層の融液が浸炭によって流動性が良くなり、滴
下した後にも、残った核部分の炭材が他の鉄原料への浸
炭源として活用される。すなわち、高炉の場合、焼結鉱
などの鉄原料とコークスを層状に装入するが、焼結鉱層
内ではコークスと接触しないため、本塊成鉱の核部分の
炭材が浸炭材として機能するのである。The carbonaceous material 21 as a core is necessary to function as a carburizing source when the outer peripheral layer is melted. Further, the melt of the outer peripheral layer becomes better in fluidity due to carburization, and even after dropping, the carbonaceous material of the remaining core portion is utilized as a carburizing source for other iron raw materials. That is, in the case of a blast furnace, iron raw materials such as sintered ore and coke are charged in layers, but since the coke does not come into contact within the sintered ore layer, the carbonaceous material of the core portion of the agglomerated ore functions as a carburizing material. Of.
【００１９】核としての炭材量は、塊成鉱の全体積当り
０．２ｖｏｌ％以上３０ｖｏｌ％以下が望ましい。例え
ば塊成鉱粒径が２５ｍｍの場合、核としての炭材粒径は
約３〜１６．７ｍｍが好ましいことになる。上限量３０
ｖｏｌ％は、塊成鉱の内部に核が存在する時に塊成鉱の
強度を維持できる上限量に相当する。下限量０．２ｖｏ
ｌ％は、浸炭材として機能しうる必要最低量である。す
なわち、核のまわりの外周層の炭材量を上限値２５ｗｔ
％としても、外周層の鉄原料の固体状態での還元率は９
０〜９５％レベルであり、残る５〜１０％の還元を核部
分の炭材で補う必要があり、核部分の炭材量０．２ｖｏ
ｌ％は還元材として必要な量である。したがって、本塊
成鉱に浸炭材としての役割を付加するためには、核とな
る炭材量として０．２ｖｏｌ％以上必要である。The amount of carbonaceous material as a core is preferably 0.2 vol% or more and 30 vol% or less based on the total volume of the agglomerated ore. For example, when the particle size of the agglomerated ore is 25 mm, the particle size of the carbonaceous material as the nucleus is preferably about 3 to 16.7 mm. Upper limit 30
The vol% corresponds to the upper limit amount capable of maintaining the strength of the agglomerated ore when nuclei are present inside the agglomerated ore. Lower limit 0.2vo
1% is the minimum amount necessary to function as a carburizing material. That is, the upper limit of the amount of carbonaceous material in the outer peripheral layer around the nucleus is 25 wt.
%, The reduction rate of the iron raw material in the outer layer in the solid state is 9
The level is 0 to 95%, and the remaining 5 to 10% reduction needs to be supplemented by the carbonaceous material in the core portion.
1% is the amount required as a reducing agent. Therefore, in order to add a role as a carburizing material to the present agglomerated ore, 0.2 vol% or more is necessary as the amount of core carbon material.
【００２０】本塊成鉱を使用する方法によって、核とし
ての炭材と外周層の炭材の適正含有量は異なる。例え
ば、高炉において本塊成鉱を使用する場合、１０００℃
以上の高温領域においては、ＦｅＯ→Ｆｅへの還元能力
のあるガス濃度ηCO＜２５％であるため、炭材を含有す
る本塊成鉱の還元進行は焼結鉱やペレットに比べて速
い。本塊成鉱の外周層の炭材含有量は５〜１５ｗｔ％で
も十分な被還元性を有している。一方、竪型スクラップ
溶融炉では１０００℃以上の高温部における炉内ガス濃
度ηCOが４０〜５０％であり、炭材を内部に含まない塊
成鉱では、平衝論的にはＦｅＯまでのガス還元が生じる
が、ＦｅＯ→Ｆｅへのガス還元は生じない。しかし、本
塊成鉱は炭材を内部に含有しているため、周囲のガス濃
度によらずＦｅＯ→Ｆｅへの還元が進行する。１０００
℃以上の高温部における炉内ガス濃度ηCOが４０％以上
では、還元速度を高めるためには、外周層内の炭材含有
量として鉄原料＋炭材の重量当り１０ｗｔ％以上２５ｗ
ｔ％以下にすることが必要である。The appropriate contents of the carbonaceous material as the core and the carbonaceous material of the outer peripheral layer differ depending on the method of using the agglomerated ore. For example, when using this agglomerated ore in a blast furnace, 1000 ° C
In the above high temperature region, since the gas concentration η CO <25% capable of reducing FeO → Fe, the reduction progress of the agglomerated ore containing carbonaceous material is faster than that of sinter or pellets. Even if the carbonaceous material content of the outer peripheral layer of this agglomerated ore is 5 to 15 wt%, it has sufficient reducibility. On the other hand, in the vertical scrap melting furnace, the in-furnace gas concentration η CO in the high temperature part of 1000 ° C. or higher is 40 to 50%. Although gas reduction occurs, gas reduction from FeO to Fe does not occur. However, since this agglomerated ore contains carbonaceous material inside, reduction proceeds from FeO to Fe regardless of the gas concentration of the surroundings. 1000
At a furnace gas concentration η CO of 40% or higher in a high temperature part of ℃ or higher, in order to increase the reduction rate, the carbonaceous material content in the outer peripheral layer is 10 wt% or more and 25 w or more per weight of iron raw material + carbonaceous material.
It is necessary to be t% or less.
【００２１】なお、外周層に鉄原料の他に炭材を含有さ
せて塊成鉱とすることは通常の焼成では無理であり、非
焼成の塊成鉱として製造する必要がある。非焼成塊成化
方法としては加圧成形するブリケット化、ペレット化が
ある。In addition, it is impossible to make an agglomerated ore by adding a carbonaceous material to the outer peripheral layer in addition to the iron raw material, and it is necessary to manufacture it as a non-calcined agglomerated ore. Non-fired agglomeration methods include briquetting by pressure molding and pelletization.
【００２２】塊成鉱の粒度は製造法によって異なる。核
として使用する炭材は、小粒コークスや無煙炭あるいは
微粉炭材を造粒して核とすることも考えられる。核とな
る炭材の粒径は３〜２５ｍｍが望ましく、その場合塊成
鉱の粒径は５〜４０ｍｍとなる。核となる炭材の下限粒
径は浸炭材として必要な最低粒径であり、上限粒径は塊
成鉱の上限粒径によって規定される。塊成鉱の上限粒径
は強度を維持できる最大粒径であり、４０ｍｍである。
たとえば、ブリケット化して製造した縦４０ｍｍ×横３
０ｍｍ×高さ２０ｍｍのブリケットは塊成鉱に必要な強
度を維持できる。The particle size of agglomerated ores depends on the manufacturing method. The carbonaceous material used as the core may be obtained by granulating small coke, anthracite or pulverized carbonaceous material as the core. The particle size of the core carbonaceous material is preferably 3 to 25 mm, and in this case, the particle size of the agglomerated ore is 5 to 40 mm. The lower limit particle size of the core carbonaceous material is the minimum grain size required for the carburizing material, and the upper limit particle size is defined by the upper limit grain size of the agglomerated ore. The upper limit particle size of the agglomerated ore is the maximum particle size that can maintain the strength, and is 40 mm.
For example, 40 mm in length × 3 in width manufactured by briquetting
Briquettes of 0 mm x 20 mm in height can maintain the strength required for agglomerated ores.
【００２３】ペレット化して造粒する製造法の場合、塊
成鉱の粒径は１５〜２５ｍｍが好ましい。核の粒径が３
ｍｍの場合、原理的には５ｍｍの塊成鉱の製造が可能と
判断されるが、安定して製造でき、歩留りが良好な塊成
鉱の下限粒径は１５ｍｍである。造粒して製造した塊成
鉱は球形のため転がりやすい特性をもつため、塊成鉱の
上限粒径は装入物分布制御に悪影響がでないように焼結
鉱と同程度の大きさにすることが望ましく、２５ｍｍが
適当である。この場合、核の粒径は３〜１０ｍｍが好ま
しい。In the case of the pelletizing and granulating method, the particle size of the agglomerated ore is preferably 15 to 25 mm. The core particle size is 3
In the case of mm, it is judged in principle that an agglomerated ore of 5 mm can be produced, but the lower limit particle size of the agglomerated ore that can be produced stably and has a good yield is 15 mm. Since the agglomerated ore produced by granulation has a spherical shape and has the property of rolling easily, the upper limit particle size of the agglomerated ore should be the same size as the sintered ore so as not to adversely affect the control of the charge distribution. Desirably, 25 mm is suitable. In this case, the particle size of the core is preferably 3 to 10 mm.
【００２４】核としての炭材には例えば細粒コークス、
無煙炭、粉状のコークスの１種または２種以上の造粒物
を用い、外周層中の炭材には無煙炭粉および／または粉
状のコークスを用いるのが適当である。また、外周層中
の鉄原料は鉄鉱石粉、還元鉄粉、製鉄工程より発生する
ダストの１種または２種以上で構成される。The carbonaceous material as the core is, for example, fine coke,
It is suitable to use one or two or more kinds of granules of anthracite and powdery coke, and use anthracite powder and / or powdery coke for the carbonaceous material in the outer peripheral layer. The iron raw material in the outer peripheral layer is composed of one or more of iron ore powder, reduced iron powder, and dust generated in the iron making process.
【００２５】つぎに、本発明の塊成鉱の製造方法、特に
ペレット化する場合について述べる。Next, the method for producing the agglomerated ore according to the present invention, particularly the case of pelletizing, will be described.
【００２６】図３は細粒コークスもしくは無煙炭の両方
またはどちらか一方の炭材を核とする場合の製造フロー
の一例を示す。FIG. 3 shows an example of a manufacturing flow in the case where both or one of the fine grain coke and the anthracite is used as the core.
【００２７】まず、製鉄工程より発生するダストをダス
ト貯槽１に、ペレットフィードや砂鉄等の鉄鉱石を鉄鉱
石貯槽２に、セメントまたは高炉水砕微粉末を主材料と
する粉末をセメント貯槽３に装入する。First, the dust generated in the iron making process is stored in the dust storage tank 1, the pellet feed and iron ore such as sand iron are stored in the iron ore storage tank 2, and the cement or the powder containing ground granulated blast furnace powder as the main material is stored in the cement storage tank 3. Charge.
【００２８】ダストおよび鉄鉱石は後工程の造粒のため
少なくとも粒径１ｍｍ以下が良く、望ましくは４４μｍ
以下が３０％以上とし、１４９μｍ以上が２０％であれ
ばさらに良好である。Since the dust and iron ore are granulated in the later step, the particle size is preferably at least 1 mm or less, preferably 44 μm.
It is more preferable that the following is 30% or more and 20% is 149 μm or more.
【００２９】刺激剤貯槽４には、高炉水砕微粉末を主材
料とする粉末を硬化材として使用する場合のカルシウム
系アルカリ刺激剤を必要に応じて装入する。The stimulant storage tank 4 is charged with a calcium-based alkali stimulant, when a powder containing ground granulated blast furnace powder as a main material is used as a hardening agent, if necessary.
【００３０】炭材貯槽５には鉄原料に混合する炭材を装
入する。The carbonaceous material storage tank 5 is charged with a carbonaceous material mixed with the iron raw material.
【００３１】貯槽１〜５から所定の配合比率になるよう
に定量的に切り出しを行い、添加水とともにボールミル
６に装入し、硬化剤の分散と原料の混合、混練および調
湿を行うが、硬化剤は原料および後工程で加える炭材の
合計量の２〜４％になるように量を決定する。また、ボ
ールミル６は、原料と硬化剤の分散、原料の混合、混練
および調湿が十分に行えれば他の混合機でも良い。Quantitative cutting is performed from the storage tanks 1 to 5 so as to have a predetermined mixing ratio, and the resulting mixture is charged into a ball mill 6 together with added water to carry out dispersion of a curing agent, mixing of raw materials, kneading and humidity control. The amount of the curing agent is determined so as to be 2 to 4% of the total amount of the raw material and the carbonaceous material added in the subsequent step. Further, the ball mill 6 may be another mixer as long as the dispersion of the raw material and the curing agent, the mixing of the raw materials, the kneading and the humidity control can be sufficiently performed.
【００３２】粒径３〜１０ｍｍの粒状コークスおよび／
または無煙炭の炭材からなる塊成鉱の核となる炭材を粒
状炭材貯槽７に装入し、混練および調湿が十分に行われ
た上記配合物に対して体積分率で０．２〜３０ｖｏｌ％
となるように添加する。Granular coke having a particle size of 3 to 10 mm and /
Alternatively, a carbonaceous material serving as a core of an agglomerated ore consisting of anthracite carbonaceous material is charged into the granular carbonaceous material storage tank 7 and the volume fraction of the compounded mixture is 0.2 with respect to that of the above-mentioned compound which has been sufficiently kneaded and humidified. ~ 30vol%
To be added.
【００３３】粒状炭材をボールミル６の前で装入すると
ボールミル６で粉砕されて粒径が小さくなってしまい、
核と成りえなくなるので、ボールミル６の後で添加す
る。また、炭材として使用する細粒コークスとしては、
例えば高炉用コークスの製造および搬送過程において発
生するものを使用すれば良く、またそのままでは高炉に
使用できない無煙炭を造粒して使用しても良い。When the granular carbonaceous material is charged in front of the ball mill 6, it is crushed by the ball mill 6 and the particle size becomes small.
Since it cannot be a core, it is added after the ball mill 6. Also, as fine grain coke used as carbonaceous material,
For example, what is generated in the process of manufacturing and transporting blast furnace coke may be used, or anthracite that cannot be used in the blast furnace as it is may be granulated and used.
【００３４】炭材と硬化剤を混合した原料は、中継槽８
を経た後、皿型造粒機９に送られ、１５〜２５ｍｍのペ
レットに造粒されるが、粒状炭材はダストおよび鉱石に
比べ粒径が大きいため、ペレットの核となって造粒され
る。The raw material obtained by mixing the carbonaceous material and the curing agent is used in the relay tank 8
After that, it is sent to the dish-type granulator 9 and granulated into pellets of 15 to 25 mm, but since the granular carbonaceous material has a larger particle size than dust and ore, it is granulated as a core of the pellet. It
【００３５】ペレットはスクリーン１０で＜１０ｍｍを
篩分けた後、スタッカー１１で養生ヤード１２に積み付
けられ、一定期間養生することにより強度を発現し、成
品となる。The pellets are sieved to <10 mm by a screen 10 and then stacked in a curing yard 12 by a stacker 11 and cured for a certain period of time to develop strength and become a finished product.
【００３６】次に、粉状のコークスまたは無煙炭を塊成
鉱の核として使用する場合を説明する。Next, the case where powdery coke or anthracite is used as the core of the agglomerated ore will be described.
【００３７】図４は粉状のコークスまたは無煙炭を核と
して使用する場合の製造フローを示す図である。細粒コ
ークスまたは無煙炭を核として使用する場合には、前段
階として粒状炭材貯槽１３に粉状のコークスまたは無煙
炭を装入し、バインダー貯槽１４にベントナイト等のバ
インダーを装入し、炭材に対してバインダーを５〜２０
％の範囲で添加し、混合機１５で十分に混合、調湿した
後に、中継槽１６を経て皿型造粒機１７で粒径３〜１０
ｍｍの炭材ペレットを製造する。FIG. 4 is a diagram showing a manufacturing flow when powdery coke or anthracite is used as a core. When fine coke or anthracite is used as a core, powdery coke or anthracite is charged into the granular carbonaceous material storage tank 13 as a pre-stage, and a binder such as bentonite is charged into the binder storage tank 14 to form a carbonaceous material. 5 to 20 binders
%, And after being sufficiently mixed and adjusted in the mixer 15, the particle size is 3 to 10 in the dish type granulator 17 through the relay tank 16.
mm carbonaceous material pellets are produced.
【００３８】この炭材ペレットを図３に示した方法と同
様にしてペレットフィードや砂鉄等の鉄鉱石原料のペレ
ットの核として１５〜２５ｍｍ造粒し、一定期間養生す
ることにより強度が発現し、成品となる。In the same manner as in the method shown in FIG. 3, the carbonaceous material pellets are pelletized and granulated for 15 to 25 mm as cores of iron ore raw material pellets such as iron sand, and aged for a certain period of time to develop strength, It becomes a product.
【００３９】[0039]
【実施例】以下、実施例により本発明を具体的に説明す
る。The present invention will be described below in detail with reference to examples.
【００４０】実施例１は、核として３〜５ｍｍの細粒コ
ークスを使用し、細粒コークスの体積分率を塊成鉱全体
の３ｖｏｌ％とし、外周層の鉄原料と炭材の混合物中の
２００μｍ以下の炭材の重量割合を２０ｗｔ％とした粒
径１６ｍｍの非焼成塊成鉱を図３に示した方法で製造し
た。成品塊成鉱の成分を表１に示す。従来の焼結鉱はＪ
ＩＳ−ＲＩ値が６２〜６７％であったが、本塊成鉱は７
５〜９５％と向上した。In Example 1, fine grain coke having a diameter of 3 to 5 mm was used as the core, the volume fraction of the fine grain coke was 3 vol% of the whole agglomerated ore, and the iron raw material and the carbonaceous material of the outer peripheral layer were mixed. A non-calcined agglomerated ore having a particle size of 16 mm in which the weight ratio of the carbonaceous material of 200 μm or less was 20 wt% was manufactured by the method shown in FIG. Table 1 shows the components of the product agglomerated ore. Conventional sinter is J
IS-RI value was 62-67%, but this agglomerated ore was 7
It improved to 5 to 95%.
【００４１】本塊成鉱を焼結鉱などの鉱石類と混合して
高炉に装入し、１０ｋｇ／ｔ使用したところ、高炉に装
入するコークス比は５ｋｇ／ｔ低減した。これは、高炉
内に装入した塊成鉱中に含まれる内装Ｃ量２．５ｋｇよ
りも低減しており、本塊成鉱が高被還元性塊成鉱として
高炉の反応効率向上に寄与することを示している。When this agglomerated ore was mixed with ores such as sintered ore and charged into a blast furnace and used at 10 kg / t, the coke ratio charged into the blast furnace was reduced by 5 kg / t. This is less than the internal C amount of 2.5 kg contained in the agglomerated ore charged into the blast furnace, and this agglomerated ore contributes to the improvement of the reaction efficiency of the blast furnace as a highly reducible agglomerated ore. It is shown that.
【００４２】実施例２は、核として粒径１ｍｍ以下の粉
状のコークスをペレタイザーで予備造粒して１０ｍｍの
核とし、外周層の鉄原料と炭材の混合物中の炭材の重量
割合を２０ｗｔ％とした粒径２０ｍｍの非焼成塊成鉱を
図３に示した方法で製造した。鉄原料としては、製鉄工
程より発生するダストを使用した。成品塊成鉱の化学成
分を表１に示す。In Example 2, powdery coke having a particle size of 1 mm or less was pre-granulated with a pelletizer to form a 10 mm core, and the weight ratio of the carbonaceous material in the mixture of the iron raw material and the carbonaceous material of the outer peripheral layer was adjusted. A non-calcined agglomerated ore having a particle size of 20 mm at 20 wt% was manufactured by the method shown in FIG. As the iron raw material, dust generated in the iron making process was used. Table 1 shows the chemical composition of the product agglomerated ore.
【００４３】通常操業では鋼スクラップ１００％を溶解
する竪型スクラップ溶融炉に、本発明の塊成鉱を１００
ｋｇ／ｔ、鋼スクラップと混合して装入した。通常操業
では鋼スクラップ溶解に必要な酸素富化率は８％程度必
要であったが、本塊成鉱を２００ｋｇ／ｔ使用した操業
では、鋼スクラップ溶解に必要な酸素富化率は４〜５％
で操業することができた。理論燃焼温度Ｔｆは、通常操
業のＴｆ＝２６５０℃に対し、本塊成鉱を使用した操業
ではＴｆ＝２４００℃であり、低い温度で鋼スクラップ
溶解が可能になった。すなわち、本塊成鉱を使用すると
溶鉄中への浸炭を促進でき、溶解温度を低減できたの
で、本塊成鉱が浸炭材として機能することが確認され
た。In a normal operation, 100% of the agglomerated ore of the present invention is placed in a vertical scrap melting furnace that melts 100% of steel scrap.
It was charged by mixing with kg / t of steel scrap. In the normal operation, the oxygen enrichment rate required for melting steel scrap was about 8%, but in the operation using 200 kg / t of this agglomerated ore, the oxygen enrichment rate required for melting steel scrap is 4-5. %
Was able to operate at. The theoretical combustion temperature Tf was Tf = 2650 ° C. in the normal operation, whereas Tf = 2400 ° C. in the operation using the agglomerated ore, and the steel scrap could be melted at a low temperature. That is, when the agglomerated ore was used, carburization into molten iron could be promoted and the melting temperature could be reduced, so that it was confirmed that the agglomerated ore functions as a carburizing material.
【００４４】[0044]
【表１】 [Table 1]
【００４５】[0045]
【発明の効果】本発明により、高炉および鋼スクラップ
を溶解する炉の操業において、被還元性、浸炭挙動が改
善でき、反応効率を向上させ、溶鉄の滴下挙動を改善で
きる。高炉操業では燃料比の低下と融着帯部の通気抵抗
の低下、鋼スクラップの溶解炉の操業ではスクラップの
溶解性が改善されるため、高出銑比を維持しながら安定
した操業が可能となる。According to the present invention, in the operation of a blast furnace and a furnace for melting steel scrap, reducibility and carburizing behavior can be improved, reaction efficiency can be improved, and molten iron dropping behavior can be improved. In the blast furnace operation, the fuel ratio decreases and the ventilation resistance in the cohesive zone decreases, and in the steel scrap melting furnace operation, the meltability of scrap is improved, so stable operation is possible while maintaining a high tap ratio. Become.
【図１】本塊成鉱の構成を示す図である。FIG. 1 is a diagram showing a structure of a main agglomerated ore.
【図２】炭材の使用割合と還元率との関係を示す図であ
る。FIG. 2 is a diagram showing a relationship between a usage rate of carbonaceous material and a reduction rate.
【図３】細粒コークスおよび／または無煙炭を核として
本塊成鉱を製造する工程の一例を示す図である。FIG. 3 is a diagram showing an example of a process for producing the present agglomerated ore using fine grain coke and / or anthracite as a core.
【図４】粉状のコークスまたは無煙炭を核として本塊成
鉱を製造する工程の一例を示す図である。FIG. 4 is a diagram showing an example of a process for producing the agglomerated ore using powdery coke or anthracite as a core.
１ ダスト貯槽 ２ 鉄鉱石貯槽 ３ セメント貯槽 ４ 刺激剤貯槽 ５ 炭材貯槽 ６ ボールミル ７ 粒状炭材貯槽 ８ 中継槽 ９ 皿型造粒機 １０ スクリーン １１ スタッカー １２ 養生ヤード １３ 粉状炭材貯槽 １４ バインダー貯槽 １５ 混合機 １６ 中継槽 １７ 皿型造粒機 ２１ 炭材 ２２ 炭材 ２３ 鉄原料 1 Dust Storage Tank 2 Iron Ore Storage Tank 3 Cement Storage Tank 4 Stimulant Storage Tank 5 Carbon Material Storage Tank 6 Ball Mill 7 Granular Carbon Material Storage Tank 8 Relay Tank 9 Dish Granulator 10 Screen 11 Stacker 12 Curing Yard 13 Powdered Carbon Material Storage Tank 14 Binder Storage Tank 15 Mixer 16 Relay tank 17 Dish-type granulator 21 Carbon material 22 Carbon material 23 Iron raw material
Claims (3)
原料と炭材の混合物からなることを特徴とする製鉄用塊
成鉱。1. An agglomerated ore for iron making, comprising carbonaceous material as a core, and an outer peripheral layer containing the core made of a mixture of iron raw material and carbonaceous material.
の０．２〜３０ｖｏｌ％で、外周層中の炭材の含有率が
５〜２５ｗｔ％であることを特徴とする請求項１記載の
製鉄用塊成鉱。2. The volume fraction of carbonaceous material as a core is 0.2 to 30% by volume of the whole agglomerated ore, and the content rate of carbonaceous material in the outer peripheral layer is 5 to 25% by weight. Item 1. An agglomerated ore for iron making according to Item 1.
外周層中の炭材および鉄原料の粒径が１ｍｍ以下で、そ
のうち４４μｍ以下が３０％以上であることを特徴とす
る請求項１または２記載の製鉄用塊成鉱。3. The particle size of carbonaceous material as a core is 3 to 25 mm,
The particle size of the carbonaceous material and the iron raw material in the outer peripheral layer is 1 mm or less, of which 44 μm or less is 30% or more, and the agglomerated ore for iron making according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2446395A JP3708981B2 (en) | 1995-01-20 | 1995-01-20 | Agglomerate for iron making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2446395A JP3708981B2 (en) | 1995-01-20 | 1995-01-20 | Agglomerate for iron making |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08199249A true JPH08199249A (en) | 1996-08-06 |
| JP3708981B2 JP3708981B2 (en) | 2005-10-19 |
Family
ID=12138873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2446395A Expired - Fee Related JP3708981B2 (en) | 1995-01-20 | 1995-01-20 | Agglomerate for iron making |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3708981B2 (en) |
Cited By (9)
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| JP2008202067A (en) * | 2007-02-16 | 2008-09-04 | Jfe Steel Kk | Charcoal-containing reduced iron for blast furnace charging and blast furnace operating method |
| JP2010013690A (en) * | 2008-07-02 | 2010-01-21 | Jfe Steel Corp | Iron-containing dust agglomerate and molten iron manufacturing method |
| WO2010041770A1 (en) | 2008-10-10 | 2010-04-15 | 新日本製鐵株式会社 | Blast furnace operating method using carbon-containing unfired pellets |
| JP2011195943A (en) * | 2010-03-24 | 2011-10-06 | Jfe Steel Corp | Agglomerated ore including carbonaceous material for iron manufacture and method for manufacturing the same |
| KR101309639B1 (en) * | 2009-11-26 | 2013-09-17 | 신닛테츠스미킨 카부시키카이샤 | A cold bonnded pellet and method for preparing thereof |
| JP5842967B1 (en) * | 2014-07-25 | 2016-01-13 | 住友金属鉱山株式会社 | Pellet manufacturing method, iron-nickel alloy manufacturing method |
| KR20200075572A (en) * | 2018-12-18 | 2020-06-26 | 주식회사 포스코 | Manufacturing apparatus of briquette, manufacturing method of briquette, manufacturing apparatus of molten iron and briquette |
| JP2022187900A (en) * | 2021-06-08 | 2022-12-20 | 株式会社神戸製鋼所 | Pig iron production method and ore raw material |
| CN117043364A (en) * | 2021-03-31 | 2023-11-10 | 杰富意钢铁株式会社 | Raw material particles for producing agglomerates, method for producing raw material particles for producing agglomerates, agglomerates, methods for producing agglomerates, and methods for producing reduced iron |
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| JPS4965303A (en) * | 1972-10-26 | 1974-06-25 | ||
| JPS52143902A (en) * | 1976-05-26 | 1977-11-30 | Kobe Steel Ltd | Calcined pellet |
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