JPH04210432A - Manufacture of semireduced sintered ore - Google Patents
Manufacture of semireduced sintered oreInfo
- Publication number
- JPH04210432A JPH04210432A JP40534490A JP40534490A JPH04210432A JP H04210432 A JPH04210432 A JP H04210432A JP 40534490 A JP40534490 A JP 40534490A JP 40534490 A JP40534490 A JP 40534490A JP H04210432 A JPH04210432 A JP H04210432A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- ore
- anthracite
- sintering
- pseudo
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 49
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003830 anthracite Substances 0.000 claims abstract description 36
- 238000005245 sintering Methods 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 34
- 230000008569 process Effects 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 44
- 239000002245 particle Substances 0.000 claims description 36
- 238000006722 reduction reaction Methods 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 7
- 230000003179 granulation Effects 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 239000003245 coal Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 25
- 239000000571 coke Substances 0.000 abstract description 18
- 229910052742 iron Inorganic materials 0.000 abstract description 11
- 230000035699 permeability Effects 0.000 abstract description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052593 corundum Inorganic materials 0.000 abstract description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 235000019738 Limestone Nutrition 0.000 abstract description 2
- 239000006028 limestone Substances 0.000 abstract description 2
- 239000003638 chemical reducing agent Substances 0.000 abstract 2
- 238000005453 pelletization Methods 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 239000008187 granular material Substances 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 3
- 235000012255 calcium oxide Nutrition 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 238000009817 primary granulation Methods 0.000 description 3
- 238000009818 secondary granulation Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- -1 calcined dolomile Chemical compound 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
［０００１１ [00011
【産業上の利用分野］本発明は、焼結プロセスで焼結鉱
の一部を還元した半還元焼結鉱の製造方法に関するもの
である。
［０００２］
【従来の技術】焼結鉱の製造に際しては、粉鉱石や副原
料、スケール、粉コークスを配合して一部ミキサーで混
合し、二次ミキサーで造粒して装入し、焼結層の通気性
を良好にしながら操業している。この焼結原料層の通気
性を良好にするために、造粒を強化したり、また粉コー
クスの燃焼を改善するために、擬似粒子の表面に粉コー
クスを多く存在させるなどの工夫がなされてきた。
［０００３］[Industrial Field of Application] The present invention relates to a method for producing semi-reduced sintered ore in which a part of the sintered ore is reduced in a sintering process. [0002] [Prior Art] When producing sintered ore, ore powder, auxiliary raw materials, scale, and coke powder are mixed in a mixer, and then granulated and charged in a secondary mixer, and sintered. The plant is operated while maintaining good permeability of the strata. In order to improve the air permeability of this sintered raw material layer, efforts have been made to strengthen granulation, and to improve the combustion of coke breeze, efforts have been made to make more coke breeze present on the surface of the pseudo particles. Ta. [0003]
【発明が解決しようとする課題】しかし今日までの改善
は、焼結プロセスでの粉コークス燃焼効率改善による焼
結生産能率や、成品歩留り、焼結鉱品質を向上すること
が主体であった。そして上記効果に加えて、高炉燃料比
低減による出銑比大幅向上を実現する半還元焼結鉱製造
の実用化された例は少ない。
［０００４］例えば、特公昭５５−１５５３６号公報の
技術は、焼結原料の混合調湿粒化に際し、はじめに鉱石
類のみ若しくはこれにコークスを全コークス量の７０％
以下の量で加えて混合調湿擬似粒化を行い、次いでこれ
に全コークス量又は残部のコークスを予め５〜２０ｗｔ
％の水分を含有させた状態、若しくはこれに親水性バイ
ンダーを添加した状態で添加し、混合擬似粒化を行うこ
とで焼結時のＮＯｘを低減させる焼結原料の事前処理方
法である。
［０００５１この方法は、擬似粒子の内層部分のコーク
ス量はむしろ全体の平均配合より低く配合し、その表面
にコークスをコーティングしてコークスと酸素の接触を
活発にし、燃焼効率を向上させる方法である。したがっ
て、コークス燃焼効率向」二によるＮＯｘの低減効果は
期待できるが、コークスが完全に燃焼するため、本方法
では融液と固体炭素との接触による直接還元反応は全く
期待できない。
［０００６］また特公昭６１１２１３１号公報の技術は
、粉鉱石、粉コークスおよび返鉱からなる粉混合物を造
粒して形成した内層と、この内層の表面に、上記粉混合
物にバインダーとして、生石灰、消石灰、焼成ドロマイ
ｌ−またはベントナイ１へのうちの１種以上を添加した
ものを造粒して外層を構成した焼結鉱用ペレットである
。
［０００７］このペレットの内層コークスは全体の平均
配合値にほぼ等しく、外層のみにバインダーを添加して
バインダー添加量を低減する中でペレット強度を確保す
るというものである。従って焼結鉱品質を向上させたり
半還元焼結鉱を製造する技術ではない。
［０００８１本発明は、従来実用化された例の少ない半
還元焼結鉱製造に関するもので、焼結プロセスで鉄鉱石
の一部を還元して焼結生産率や焼結鉱品質を改善し、か
つ高炉に半還元焼結鉱を装入して高炉燃料比を低減し、
高炉出銑比を大幅に向上させる半還元焼結鉱の製造方法
を提供するものである。
［０００９］[Problems to be Solved by the Invention] However, improvements to date have mainly focused on improving sintering production efficiency, product yield, and sintered ore quality by improving coke breeze combustion efficiency in the sintering process. In addition to the above-mentioned effects, there are few practical examples of semi-reduced sinter production that achieves a significant improvement in the iron production ratio by reducing the blast furnace fuel ratio. [0004] For example, the technique disclosed in Japanese Patent Publication No. 15536/1980 is that when sintering raw materials are mixed and granulated to control humidity, firstly, only the ore or coke is added to it to make up 70% of the total amount of coke.
Add the following amounts to perform mixing and humidity control pseudo granulation, then add 5 to 20 wt of total coke or the remaining coke to this in advance.
This is a pre-treatment method for sintering raw materials in which NOx is reduced during sintering by adding % of water or adding a hydrophilic binder to the mixture and forming pseudo-granules. [00051 In this method, the amount of coke in the inner layer of the pseudo particles is rather lower than the overall average blend, and the surface is coated with coke to activate the contact between the coke and oxygen, thereby improving combustion efficiency. . Therefore, although an effect of reducing NOx due to improved coke combustion efficiency can be expected, since the coke is completely combusted, a direct reduction reaction due to contact between the melt and solid carbon cannot be expected at all in this method. [0006] Furthermore, the technique disclosed in Japanese Patent Publication No. 6112131 includes an inner layer formed by granulating a powder mixture consisting of powdered ore, powdered coke, and return ore, and on the surface of this inner layer, quicklime, quicklime, These are pellets for sintered ore, in which the outer layer is formed by granulating slaked lime, calcined dolomile, or bentonite with one or more of them added thereto. [0007] The inner coke layer of this pellet is approximately equal to the overall average blending value, and a binder is added only to the outer layer to ensure pellet strength while reducing the amount of binder added. Therefore, it is not a technology for improving the quality of sintered ore or producing semi-reduced sintered ore. [00081] The present invention relates to the production of semi-reduced sintered ore, which has rarely been put to practical use in the past, and improves the sinter production rate and quality of sintered ore by reducing a part of iron ore in the sintering process. In addition, the blast furnace is charged with semi-reduced sintered ore to reduce the blast furnace fuel ratio.
The present invention provides a method for producing semi-reduced sintered ore that significantly improves the blast furnace tap ratio. [0009]
【課題を解決するための手段】第１の本発明は、粉鉱石
に５〜２０ｗｔ％の粉コークス・無煙炭を配合造粒して
内層とし、外層に粉鉱石、副原料および２〜５ｗｔ％の
粉コークス・無煙炭を混合コーティングして２層の擬似
粒子を形成し、この２層擬似粒子を焼結原料の一部とし
て混合、造粒したのち、焼結過程でその原料の外層から
生成する融液と内層の粉コークス・無煙炭中の固形炭素
との直接還元反応により焼結鉱の一部を還元することを
特徴とする半還元焼結鉱の製造方法である。
［００１０１また第２の本発明は、粉コークス・無煙炭
を造粒して内層とし、外層にＡｌ２Ｏ３を２．０ｗｔ％
以上含む粉鉱石が主体の焼結原料でコーティングして２
層の擬似粒子を形成し、この２層擬似粒子を焼結原料の
一部として混合、造粒したのち、焼結過程で外層とそれ
以外の原料から生成する融液と内層の粉コークス・無煙
炭中の固形炭素の固形炭素との直接還元反応により焼結
鉱の一部を還元することを特徴とする半還元焼結鉱の製
造方法である。
［００１１１[Means for Solving the Problems] The first aspect of the present invention is to mix and granulate powdered ore with 5 to 20 wt% of coke powder and anthracite to form an inner layer, and to form an outer layer of powdered ore, auxiliary raw materials, and 2 to 5 wt% of coke powder and anthracite. After coating coke powder and anthracite to form two layers of pseudo particles, and mixing and granulating these two layers of pseudo particles as part of the sintering raw material, the molten particles generated from the outer layer of the raw material during the sintering process are This is a method for producing semi-reduced sintered ore, which is characterized by reducing a part of the sintered ore through a direct reduction reaction between the liquid and solid carbon in coke powder and anthracite in the inner layer. [00101 The second invention also provides an inner layer made by granulating coke powder and anthracite, and 2.0 wt% Al2O3 in the outer layer.
Coating with sintering raw material mainly composed of fine ore containing the above 2
After forming a layer of pseudo-particles and mixing and granulating these two-layer pseudo-particles as part of the sintering raw material, the melt generated from the outer layer and other raw materials during the sintering process and the coke powder and anthracite in the inner layer are combined. This is a method for producing semi-reduced sintered ore, which is characterized in that a part of the sintered ore is reduced by a direct reduction reaction between the solid carbon contained therein and the solid carbon. [00111
【作用］本発明は、２層擬似粒子の内層に配合した５〜
２０ｗｔ％の粉コークス・無煙炭が、焼結過程でその原
料の外層から生成する融液との直接還元反応により焼結
鉱の一部を還元するので、この直接還元反応による吸熱
により、通常発生する焼結ベツド下層部の熱過剰を防止
して焼結ベツド通気性を大幅に改善するものである。
［００１２］以下、図面にもとづいて本発明を具体的に
説明する。図１−は、本発明を実施するためのプロセス
フローを示す工程図である。まず、粉鉱石９に粉コーク
ス・無煙炭１０が５〜２０ｗｔ％になるように配合した
原料で１次造粒１１し、その造粒物に粉鉱石１３と副原
料１４及び粉コークス・無煙炭１５が２〜５ｗｔ％に配
合された混合原料を加え、表面にコーティングする２次
造泣１２による２段造粒法で２層擬似粒子を形成する。
［００１３］この２層擬似粒子は、他の主原料１．副原
料２．スケール３．粉コークス・無煙炭４等と共に、焼
結原料５として１次ミキサー６．２次ミキサー７で混合
、造粒してから焼結機８に装入し焼成する。
［００１４］また本発明の他の態様は、粉コークス・無
煙炭を予め擬似粒化し、この擬似粒子にＡｌ２Ｏ３を２
．０ｗｔ％以上含む粉鉱石や副原料等でコーティングし
て２層擬似粒子となし、この２層擬似粒子を図１に示し
たような、それ以外の主原料１．副原料２．スケール３
．粉コークス・無煙炭４等と共に１次ミキサー６．２次
ミキサー７で混合、造粒してから焼結機８に装入し焼成
する。
［００１５］図２は本発明方法の変形例のプロセスフロ
ーを示す工程図である。まず、主原料１．副原料２．ス
ケール３．粉コークス・無煙炭４等からなる通常の焼結
原料５を１次ミキサー６で混合し、その後、ホッパー１
６に篩分けて取り出した篩い下の焼結原料に、粉コーク
ス・無煙炭１０が５〜２０ｗｔ％になるように配合して
から１次造粒し、その後、上述したように篩い下の焼結
原料をホッパー１６から切り出し、２次造粒１２で表面
にコーティングす２段造粒法によって２層擬似粒子を形
成し、この２層擬似粒子を２次ミキサー７後に戻して残
りの焼結原料と共に焼結機８で焼成する方法である。
［００１６１図３９図４は、上記の本発明法で形成した
２層擬似粒子の構造の概要を示す。図３は内層３０の粉
コークス・無煙炭１０ａが５〜２０ｗｔ％、外層３１の
粉コークス・無煙炭１０ｂが２〜５ｗｔ％の擬似粒子を
示す。図４は内層３０が粉コークス・無煙炭１０ａのみ
で、外層３１に粉鉱石９や副原料２が付着した擬似粒子
の状態を示している。
［００１７］これらの擬似粒子のように内部に粉コーク
ス・無煙炭１０ａを閉じ込めると、焼結工程において昇
温過程前半では粉コークス・無煙炭が空気中の酸素と接
触しないので反応せず、１１００℃の高温になってから
、初めて生成した融液と粉コークス・無煙炭中のＣがＦ
ｅＯ＋Ｃ＝Ｆｅ＋Ｃ０−３６３５０ｋｃａ ｌ／ｋｍ。
ｌ 〔冶金物理化学（松下幸雄ら著）、ｒ＋３１０）の
直接還元反応を起こし、焼結鉱の一部にメタルＦｅが生
成される。この反応は吸熱反応であるので、熱過剰にな
るのを防ぐことができる。
［００１８］また微粉コークスの造粒効果、更に偏析装
入により焼結ベツドの下層部に本発明法の擬似粒子が多
くある場合は、下層部の過剰熱を吸収して赤熱帯拡大が
防止され、特に焼結ベツド下層部の通気性が大幅に改善
される。
［００１９］本発明で用いられる造粒機とては、通常良
く使われるドラム型や皿型の造粒機の他に、マルメライ
ザー〔造粒便覧（日本粉体工業協会）ｐ、４２２〜４２
５〕、アイリッヒミキサー〔混合混練技術（日本粉体工
業協会）ｐ２０９〜２１０）、コンクリ−１へミキサー
〔混合混練技術（日本粉体工業協会）ｐ１８５〜１８６
〕などの遠心力を利用したより強固な擬似粒子を形成で
きる型の造粒機の使用が適当である。また図１と図２に
は示していないが、生石灰やベン１ヘナイ１〜等のバイ
ンダーを添加するのはより効果的である。
［００２０１本発明において、図３のように２層擬似粒
子の内層の粉コークス・無煙炭配合比を５〜２０ｗｔ％
としたのは、５ｗｔ％未満では通常の焼結鉱製造時とほ
ぼ同じであるので、直接還元反応は期待できないためで
あり、２０ｗｔ％を越えると、スラグが多量に生成して
焼結過程の通気性を阻害し、焼結操業に悪影響を及ぼす
からである。
［００２１１図４の擬似粒子タイプで、外層３１の粉鉱
石のＡｌ２Ｏ３を２．０ｗｔ以上含むとしたのは、外層
の中の粉鉱石のＡｌ２Ｏ３が２．０ｗｔ％未満であると
、外層とそれ以外の原料から生成するカルシュラムフェ
ライト系主体の融液の粘性が低くなり、粉コークス・無
煙炭から融液が流れ出して粉コークス・無煙炭が空気と
酸化反応を起こし、直接還元反応が不可能になるからで
ある［００２２］外層３１の中の粉鉱石のＡｌ２Ｏ３を
２．０ｗ１％以上であると、粉コークス・無煙炭は粘性
の高いカルシュラムフェライト系主体の融液に焼結反応
後半まで取り囲まれる割合が高くなるので、融液と固形
炭素との直接還元反応を焼結過程で活発に起こさせるこ
とができるからである。
［００２３］
【実施例】強固な造粒物を形成するため、遠心力を利用
した図５に示すマルメライザー（６００Φ、回転数３０
０ｒｐｍ）を使用して、以下の条件で半還元焼結鉱製造
の鍋試験を実施した。マルメライザーの代表的構造は、
図５の側面図および図６に示すように、固定円筒容器の
底部において、凹凸のあるまたは平面状のプレート１９
が高速回転するものである。底のプレート１９を高速で
回転させ、粉鉱石１８を形成する粒子１７を流動化させ
ることにより壁２０と粒子１７間の摩擦力で粒子１７が
回転する。この粒子自体の回転により、粒子１７内の水
分２２はつねに粒子表面に向かってはじき出されるので
、強固な造粒物の生成が可能となる。なお符号２１は粒
子の自転方向を示す。
［００２４］まず本発明例１では、豪州・ニューマン鉱
石に粉コークスを１５ｗｔ％添加した混合物８ｋｇをマ
ルメライザーで１分間造粒したのち、ニューマン鉱石に
石灰石８ｗｔ％、粉コークスを３．５ｗｔ％添加した混
合原料を１２ｋｇ加えて、さらに１分間造粒して２層の
擬似粒子を作成した。
［００２５］本発明例２では、表１に示す鍋試験の配合
原料を一度ドラム型ミキサーで２分間混合したのち篩い
分けして、Ｌｎｕｎ以下７０’％以ヒの混合物を８ｋｇ
取り出して粉コークス１ｋｇをさらに添加し、その混合
物をマルメライザーで１分間造粒した。そして同じ配合
原Ｈのｌｒｎｍ以下７０％以上の混合物をさらに１２ｋ
ｇ添加して１分間造粒して２層の擬似粒子を作成した。
［００２６１本発明例３では、粉コークス８ｋｇをまず
マルメライザーで１分間造粒し、その後にニューマン鉱
石１２ｋｇを添加してマルメライザーで２分間造粒した
。これらの造粒物を表１に示す配合原料の配合割合で焼
結原料に配合し１．４０ ｋ ｇ鍋試験により比較例と
同じ鍋試験方法でテス１へしまた。
［００２７］鍋試験の主要な条件は表２に示した。
［００２８］[Function] The present invention is characterized by the fact that 5-
Since 20wt% of coke powder and anthracite reduce a part of the sintered ore through a direct reduction reaction with the melt generated from the outer layer of the raw material during the sintering process, the heat absorption caused by this direct reduction reaction normally generates This prevents excessive heat in the lower layer of the sintered bed and greatly improves the air permeability of the sintered bed. [0012] Hereinafter, the present invention will be specifically explained based on the drawings. FIG. 1 is a process diagram showing a process flow for carrying out the present invention. First, primary granulation 11 is performed using a raw material in which powdered ore 9 is blended with powdered coke and anthracite 10 at a concentration of 5 to 20 wt%, and the granulated product contains powdered ore 13, auxiliary raw materials 14, and coke powder and anthracite 15. A two-layer pseudo particle is formed by a two-stage granulation method using a secondary granulation method 12 in which a mixed raw material blended at 2 to 5 wt% is added and the surface is coated. [0013] This two-layer pseudo-particle contains other main raw materials 1. Auxiliary raw materials 2. Scale 3. Together with coke powder, anthracite 4, etc., it is mixed as a sintering raw material 5 in a primary mixer 6 and a secondary mixer 7, granulated, and then charged into a sintering machine 8 and fired. [0014] In another aspect of the present invention, coke powder/anthracite is made into pseudo-granules in advance, and Al2O3 is added to the pseudo-particles.
．． Two-layer pseudo-particles are formed by coating with powdered ore, auxiliary raw materials, etc. containing 0 wt% or more, and these two-layer pseudo-particles are coated with other main raw materials 1. as shown in FIG. Auxiliary raw materials 2. scale 3
．． It is mixed and granulated with coke powder, anthracite 4, etc. in a primary mixer 6 and a secondary mixer 7, and then charged into a sintering machine 8 and fired. [0015] FIG. 2 is a process diagram showing a process flow of a modification of the method of the present invention. First, main ingredients 1. Auxiliary raw materials 2. Scale 3. A normal sintering raw material 5 consisting of coke powder, anthracite 4, etc. is mixed in a primary mixer 6, and then transferred to a hopper 1.
The sintered raw material under the sieve that was sieved and taken out in step 6 is mixed with powdered coke and anthracite 10 at a concentration of 5 to 20 wt%, and then subjected to primary granulation, and then sintered under the sieve as described above. The raw material is cut out from the hopper 16, and the surface is coated with the secondary granulation 12 to form two-layer pseudo-particles, and the two-layer pseudo-particles are returned after the secondary mixer 7 to be mixed with the remaining sintered raw materials. This is a method of firing with a sintering machine 8. [00161FIG. 39FIG. 4 shows an outline of the structure of the two-layer pseudo-particles formed by the above-described method of the present invention. FIG. 3 shows pseudo particles in which the inner layer 30 contains 5 to 20 wt% of coke powder and anthracite 10a, and the outer layer 31 contains 2 to 5 wt% of coke powder and anthracite 10b. FIG. 4 shows a state of pseudo particles in which the inner layer 30 is only made of coke powder and anthracite 10a, and the outer layer 31 has ore powder 9 and auxiliary raw materials 2 attached thereto. [0017] When coke powder and anthracite 10a are trapped inside like these pseudo particles, the coke powder and anthracite do not come into contact with oxygen in the air during the first half of the temperature rising process in the sintering process, so they do not react, and at 1100°C. The C in the melt, coke powder, and anthracite that is formed for the first time after the temperature rises is F.
eO+C=Fe+C0-36350kcal/km. 1 [Metallurgical Physical Chemistry (written by Yukio Matsushita et al., r+310)] direct reduction reaction occurs, and metal Fe is generated in a part of the sintered ore. Since this reaction is endothermic, excess heat can be prevented. [0018] In addition, if there are many pseudo particles of the present invention in the lower layer of the sintered bed due to the granulation effect of fine coke and further segregation charging, excess heat in the lower layer will be absorbed and red zone expansion will be prevented. In particular, the air permeability of the lower layer of the sintered bed is greatly improved. [0019] Granulators used in the present invention include, in addition to commonly used drum-type and dish-type granulators, Marmerizer [Granulation Handbook (Japan Powder Industry Association) p. 422-42
5], Eirich mixer [Mixing and kneading technology (Japan Powder Industry Association) p.209-210), Mixer for concrete 1 [Mixing and kneading technology (Japan Powder Industry Association) p.185-186
] It is appropriate to use a type of granulator that can form stronger pseudo-particles using centrifugal force. Although not shown in FIGS. 1 and 2, it is more effective to add a binder such as quicklime or binder. [00201 In the present invention, as shown in FIG.
This is because if it is less than 5wt%, the reaction is almost the same as in normal sintered ore production, so a direct reduction reaction cannot be expected.If it exceeds 20wt%, a large amount of slag will be generated and the sintering process will be affected. This is because it obstructs air permeability and adversely affects sintering operations. [00211 In the pseudo particle type shown in Fig. 4, the reason why the fine ore in the outer layer 31 contains 2.0 wt% or more of Al2O3 is that if the Al2O3 of the fine ore in the outer layer is less than 2.0 wt%, the outer layer and other The viscosity of the calcilum ferrite-based melt generated from the raw materials becomes low, and the melt flows out from the coke powder and anthracite, causing an oxidation reaction between the coke powder and anthracite and air, making a direct reduction reaction impossible. [0022] When the Al2O3 content of the ore powder in the outer layer 31 is 2.0w1% or more, the proportion of coke powder and anthracite that is surrounded by the highly viscous calcilum ferrite-based melt until the latter half of the sintering reaction is increased. This is because the direct reduction reaction between the melt and solid carbon can be actively caused during the sintering process. [0023] [Example] In order to form strong granules, a marmerizer (600Φ, rotation speed 30
A pot test for producing semi-reduced sintered ore was conducted under the following conditions. The typical structure of Marmerizer is
At the bottom of the fixed cylindrical container, as shown in the side view of FIG. 5 and in FIG.
rotates at high speed. By rotating the bottom plate 19 at high speed and fluidizing the particles 17 forming the fine ore 18, the particles 17 are rotated by the frictional force between the wall 20 and the particles 17. Due to the rotation of the particles themselves, the moisture 22 within the particles 17 is always pushed out toward the particle surface, making it possible to produce a strong granulated product. Note that the reference numeral 21 indicates the rotation direction of the particles. [0024] First, in Example 1 of the present invention, 8 kg of a mixture of Australian Newman ore with 15 wt% of coke powder added was granulated for 1 minute using a marmerizer, and then 8 wt% of limestone and 3.5 wt% of coke powder were added to Newman ore. 12 kg of the mixed raw material obtained was added and granulated for another minute to create two layers of pseudo particles. [0025] In Example 2 of the present invention, the raw materials for the pot test shown in Table 1 were mixed once for 2 minutes in a drum mixer and then sieved to obtain 8 kg of a mixture containing 70'% or less of Lnun or less.
It was taken out, 1 kg of coke powder was further added, and the mixture was granulated with a marmerizer for 1 minute. Then, add a further 12k of the mixture of 70% or less of lrnm of the same ingredient H.
g was added and granulated for 1 minute to create two-layer pseudo particles. [00261 In Example 3 of the present invention, 8 kg of coke powder was first granulated with a Marmerizer for 1 minute, and then 12 kg of Newman ore was added and granulated with a Marmerizer for 2 minutes. These granules were blended with the sintering raw material at the blending ratio of the blended raw materials shown in Table 1, and subjected to a 1.40 kg pot test using the same pot test method as the comparative example. [0027] The main conditions of the pot test are shown in Table 2. [0028]
【表１】 ［００２９］[Table 1] [0029]
【表２】
［００３０１図７には鍋試験結果の生産率、成品歩留り
、ＴＩ（冷間強度、ＪＩＳＭ８７１２により測定）。
ＲＤＩ（還元粉化率、製銑部会報）、（５）ＲＩ（還元
率、Ｊ ｌ５Ｍ８７１３）、 メタルＦｅを示した。
［００３１１その結果、本発明による方法の次の効果が
示された。
（１）焼結ベツド全体の通気性向上に加えて、特に下層
部の赤熱帯拡大が防止されるので、通気性が大幅に改善
され、生産率と成品歩留りが向上する。
（２）焼結ベツドの通気性改善と、特に焼結ベツド中・
下層部の均一焼成により、ＴＩ （冷間強度）とＲＤ
Ｉ（還元粉化性）が向上する。
（３）本発明方法の実施により焼結鉱中にメタル鉄が２
〜３ｗｔ％生成した。ＦｅＯ分析値は約１０ｗｔ％であ
った。なお、未然のカーボンは焼結鉱中に０．０５ｗｔ
％程度しか残存していなかった。
［００３２］以上の結果、焼結鉱のＲＩ （還元率）
で評価すると、本発明法はいずれも１０％程度の還元率
向上がみられた。
［０（〕３３］[Table 2] [00301] Figure 7 shows the production rate, product yield, and TI (cold strength, measured according to JISM8712) of the pot test results. RDI (reduction rate, ironmaking department bulletin), (5) RI (reduction rate, J15M8713), and metal Fe are shown. [00311 As a result, the following effects of the method according to the present invention were shown. (1) In addition to improving the air permeability of the entire sintered bed, the expansion of the red zone in the lower layer in particular is prevented, so the air permeability is greatly improved, and the production rate and product yield are improved. (2) Improving the air permeability of the sintered bed, especially in the sintered bed.
Uniform firing of the lower layer improves TI (cold strength) and RD.
I (reduction pulverizability) is improved. (3) By carrying out the method of the present invention, two metal irons are added to the sintered ore.
~3wt% was produced. The FeO analysis value was about 10 wt%. In addition, the amount of unnatural carbon in the sintered ore is 0.05wt.
Only about % remained. [0032] As a result of the above, the RI (reduction rate) of sintered ore
When evaluated, all of the methods of the present invention showed an improvement in the reduction rate of about 10%. [0(]33]
【発明の効果】本発明によれば、焼結ベツド内での直接
還元反応により焼結鉱の一部を還元する二とができ、ま
た吸熱反応のため焼結ベツド老体と、特に■層部の熱過
刺を防止できるので通気性か改善され、生産率と成品歩
留り、焼結鉱品質が大幅に向上′する。また、メタルＦ
ｅの生成による焼結鉱の還元率向上により、高炉操業の
燃料比、出銑比を改善できる。According to the present invention, it is possible to reduce a part of the sintered ore by a direct reduction reaction within the sintered bed, and due to the endothermic reaction, the aged sintered ore and especially the Since it prevents overheating of the parts, air permeability is improved, and the production rate, product yield, and quality of sintered ore are greatly improved. Also, metal F
By improving the reduction rate of sintered ore due to the production of e, it is possible to improve the fuel ratio and tap iron ratio in blast furnace operation.
【図１】本発明を実施するためのプロセスフ「］−の−
例を示す工程図である。FIG. 1: Process flow for carrying out the present invention
It is a process chart which shows an example.
【図２】本発明を実施するためのプロセスフローの変形
例を示す工程図である。FIG. 2 is a process diagram showing a modification of the process flow for implementing the present invention.
【図３】本発明法で形成した２層擬似粒子の構造を示す
図面である。FIG. 3 is a diagram showing the structure of two-layer pseudoparticles formed by the method of the present invention.
【図４】内層が粉コークス・無煙炭、外層に粉鉱石や副
原料が付着した擬似粒子の構造を示す図面である。FIG. 4 is a drawing showing the structure of pseudo particles in which the inner layer is coke powder and anthracite, and the outer layer is attached to fine ore and auxiliary materials.
【図５】マルメライザーの代表的構造を示す側面図であ
る。FIG. 5 is a side view showing a typical structure of a marmerizer.
【図６】マルメライザー内の粒子の自転状況を示す図面
である。FIG. 6 is a drawing showing the rotation of particles in the marmerizer.
【図７】鍋試験結果を示す図面である。FIG. 7 is a drawing showing the pot test results.
１ 主原料
２ 副原料
３ スケール
４ 粉コークス・無煙炭
５ 焼結原料
６１次ミキサー
７２次ミキサー
８ 焼結機
９ 粉鉱石
１０．１０ａ、１０ｂ 粉コークス・無煙炭１１１次
造粒
１２２次造粒
１３ 粉鉱石
１４ 副原料
１５ 粉コークス・無煙炭
１６ ホッパー
１７ 造粒物
１８ 造粒前の粉鉱石、副原料、粉コークス、無煙炭１
９ プレート
２０ 壁面
２１ 粒子の自転方向
２２ 水分
３０ 内層
３１ 外層1 Main raw material 2 Sub-raw material 3 Scale 4 Coke powder/Anthracite 5 Sintering raw material 6 Primary mixer 7 Secondary mixer 8 Sintering machine 9 Powdered ore 10.10a, 10b Coke powder/Anthracite 11 Primary granulation 12 Secondary granulation 13 Powder ore 14 Auxiliary raw materials 15 Coke powder/anthracite 16 Hopper 17 Granules 18 Powdered ore before granulation, auxiliary raw materials, coke powder, anthracite 1
9 Plate 20 Wall surface 21 Particle rotation direction 22 Moisture 30 Inner layer 31 Outer layer
【図２】[Figure 2]
Claims (2)
煙炭を配合造粒して内層とし、外層に粉鉱石、副原料お
よび２〜５ｗｔ％の粉コークス・無煙炭を混合コーティ
ングして２層の擬似粒子を形成し、この２層擬似粒子を
焼結原料の一部として混合、造粒したのち、焼結過程で
その原料の外層から生成する融液と内層の粉コークス・
無煙炭中の固形炭素との直接還元反応により焼結鉱の一
部を還元することを特徴とする半還元焼結鉱の製造方法
。Claim 1: The inner layer is made by blending and granulating 5 to 20 wt% of coke powder and anthracite to powdered ore, and the outer layer is coated with a mixture of ore powder, auxiliary raw materials, and 2 to 5 wt% of coke powder and anthracite, resulting in two layers. The two-layer pseudo particles are mixed and granulated as part of the sintering raw material, and then the melt produced from the outer layer of the raw material and the coke powder from the inner layer are mixed during the sintering process.
A method for producing semi-reduced sintered ore, which comprises reducing a portion of the sintered ore through a direct reduction reaction with solid carbon in anthracite coal.
外層にＡｌ＿２Ｏ＿３を２．０ｗｔ％以上含む粉鉱石が
主体の焼結原料でコーティングして２層の擬似粒子を形
成し、この２層擬似粒子を焼結原料の一部として混合、
造粒したのち、焼結過程で外層とそれ以外の原料から生
成する融液と内層の粉コークス・無煙炭中の固形炭素の
固形炭素との直接還元反応により焼結鉱の一部を還元す
ることを特徴とする半還元焼結鉱の製造方法。[Claim 2] Granulating coke powder and anthracite to form the inner layer,
The outer layer is coated with a sintering raw material mainly composed of fine ore containing 2.0 wt% or more of Al_2O_3 to form two-layer pseudo particles, and the two-layer pseudo particles are mixed as part of the sintering raw material.
After granulation, a part of the sintered ore is reduced through a direct reduction reaction between the melt generated from the outer layer and other raw materials during the sintering process and the solid carbon in the coke powder and anthracite in the inner layer. A method for producing semi-reduced sintered ore, characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40534490A JP2704673B2 (en) | 1990-12-06 | 1990-12-06 | Method for producing semi-reduced sintered ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40534490A JP2704673B2 (en) | 1990-12-06 | 1990-12-06 | Method for producing semi-reduced sintered ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04210432A true JPH04210432A (en) | 1992-07-31 |
| JP2704673B2 JP2704673B2 (en) | 1998-01-26 |
Family
ID=18514954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP40534490A Expired - Lifetime JP2704673B2 (en) | 1990-12-06 | 1990-12-06 | Method for producing semi-reduced sintered ore |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2704673B2 (en) |
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