JPS6365728B2 - - Google Patents
Info
- Publication number
- JPS6365728B2 JPS6365728B2 JP59273370A JP27337084A JPS6365728B2 JP S6365728 B2 JPS6365728 B2 JP S6365728B2 JP 59273370 A JP59273370 A JP 59273370A JP 27337084 A JP27337084 A JP 27337084A JP S6365728 B2 JPS6365728 B2 JP S6365728B2
- Authority
- JP
- Japan
- Prior art keywords
- coke
- cao
- blast furnace
- slag
- content
- 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.)
- Expired
Links
- 239000000571 coke Substances 0.000 claims description 17
- 239000002893 slag Substances 0.000 claims description 10
- 238000011017 operating method Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 28
- 239000000292 calcium oxide Substances 0.000 description 14
- 235000012255 calcium oxide Nutrition 0.000 description 14
- 229910000805 Pig iron Inorganic materials 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 241000282898 Sus scrofa Species 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910019440 Mg(OH) Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 241001220243 Sus scrofa taivanus Species 0.000 description 1
- 239000011575 calcium Substances 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
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000010409 ironing Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
Description
【発明の詳細な説明】
「発明の目的」
本発明は低Ｓ高炉操業法の創案に係り、高炉に
おいて銑鉄を得るに当つて設備的損耗を見ること
なく、しかも効率的な脱Ｓすることのできる新し
い操業法を提供しようとするものである。[Detailed Description of the Invention] ``Object of the Invention'' The present invention relates to the creation of a low-S blast furnace operating method, which enables efficient de-S removal without equipment wear and tear when producing pig iron in a blast furnace. The aim is to provide a new method of operation that can be used.
産業上の利用分野
高炉において低Ｓ化された銑鉄を得るための操
業法。Industrial application field An operating method for obtaining low-S pig iron in a blast furnace.
従来の技術
高炉において出銑するに当り、該銑鉄中のＳ分
を低下することについては従来から種々に検討が
なされて来たが、このような従来の銑鉄中脱Ｓは
スラグとメタルとの間の反応で行うことに主眼が
おかれている。即ちスラグ中のCaO／SiO2、ス
ラグ量、MgO量などによつて脱Ｓし、低Ｓ化し
ようとするものであつて、高炉内装入原料中Ｓ分
の90％以上をしめるコークス中Ｓは羽口附近でコ
ークスが燃焼する際に一度SO2となり、その後還
元されてSO2、CS2、CS、H2S、HS、COSなど
のＳ含有ガスとなるが、このガスが炉内を上昇す
る中に銑鉄石類に吸収されることが確認され、そ
の後炉床でのスラグ−メタル反応により脱Ｓすべ
きものとされている。Conventional technology When tapping iron in a blast furnace, various studies have been made to reduce the S content in the pig iron. The main focus is on reactions in between. In other words, it is intended to remove S and reduce S by changing CaO/SiO 2 in slag, the amount of slag, the amount of MgO, etc. S in coke, which accounts for more than 90% of the S content in the raw material input into the blast furnace, is When coke burns near the tuyeres, it becomes SO 2 and is then reduced to S-containing gases such as SO 2 , CS 2 , CS, H 2 S, HS, and COS, which rise inside the furnace. It has been confirmed that the sulfur is absorbed into pig iron stones during the process, and then it is supposed to be removed by a slag-metal reaction in the hearth.
発明が解決しようとする問題点
しかし上記のような従来法によるスラグ−メタ
ル反応の脱Ｓではその脱硫率が91〜92％が限界で
あつてそれ以上に脱Ｓすることができず、Ｓ分の
低下については更に特別な処理を加えることが必
要である。Problems to be Solved by the Invention However, in the conventional method of desulfurization using the slag-metal reaction as described above, the desulfurization rate is limited to 91 to 92%, and it is not possible to remove more than that. It is necessary to add special treatment for the decrease in .
なお発明者等はこのような脱Ｓを羽口水準の高
温部で行うべく該部分に石炭石を吹込んでＳを
CaSとして固定し脱Ｓすることについて実地検討
したが、このようにしても脱Ｓ率は殆んど変化し
ない。しかもこのような羽口先部分への石炭石吹
込みによつて羽口先の損耗が著しく設備の耐用性
を著しく損うことになる。 In order to remove S in a high-temperature area at the level of the tuyere, the inventors injected coal stone into the area to remove S.
A practical study was conducted on fixing as CaS and removing S, but even with this method, the S removal rate hardly changes. Moreover, such injection of coal stone into the tuyere tip causes significant wear and tear on the tuyere tip, significantly impairing the durability of the equipment.
「発明の構成」
問題点を解決するための手段
高炉内に鉱石とコークスとを交互に層状として
装入し、羽口からの熱風吹込みにより前記鉱石を
予熱、還元、軟化、溶融せしめて出銑するに当
り、前記コークス中にCaO系又はMgO系造滓を
添加することを特徴とする低Ｓ高炉操業法。"Structure of the Invention" Means for Solving the Problems Ore and coke are charged into a blast furnace in alternating layers, and the ore is preheated, reduced, softened, and melted by blowing hot air from the tuyeres, and then discharged. A low S blast furnace operating method characterized by adding CaO-based or MgO-based slag to the coke during ironing.
作 用
コークス中に添加されたCaO系又はMgO系造
滓剤はコークスに包囲され、鉄鉱石やFeO或いは
スラグ成分と反応することなしに羽口先レベルの
高温部に降下せしめられ、羽口先におけるコーク
スの燃焼によつてガス中Ｓ分と反応し、CaS、
MgSの如くＳ分を吸収し、効率的な脱Ｓが図ら
れる。Function The CaO-based or MgO-based slag forming agent added to the coke is surrounded by coke and is allowed to fall to the high temperature area at the tuyere tip level without reacting with iron ore, FeO or slag components, and the coke at the tuyere tip is Reacts with the S content in the gas by burning CaS,
It absorbs S content like MgS, and efficiently removes S.
実施例
上記のような本発明について更に説明すると、
本発明者等は前記したような従来一般法において
一旦ガス化したＳ分がその上昇過程において再び
鉱石中に吸収され、従つて炉頂部から排出される
高炉ガス中にはＳ分が殆んど存しないことに問題
があるものとし、前項で述べたように羽口先でそ
のガス中ＳをCaS、MgSとして吸収させるなら
ば再びメタルへ復Ｓすることはあり得ないものと
推定され、実地検討したが思わしい結果が得られ
ず、却つて羽口端部の著しい損耗を見たことは上
記の通りである。なおこのような脱Ｓ目的のCaO
やMgOは鉄鉱石やFeOと反応してカルシウムフ
エライト（CaO・Fe2O3）、カルシウムシリケー
ト（CaO・SiO2）などになるならば銑鉄中の脱
Ｓ機能を殆んど求め得ない。Examples To further explain the present invention as described above,
The present inventors have discovered that in the conventional general method as described above, the S content once gasified is absorbed into the ore again during the rising process, and therefore most of the S content is contained in the blast furnace gas discharged from the top of the furnace. If the S in the gas is absorbed as CaS and MgS at the tuyere tip as mentioned in the previous section, it is presumed that it is impossible for S to return to the metal. However, as mentioned above, the desired results were not obtained, and rather significant wear and tear was observed at the end of the tuyere. In addition, such CaO for the purpose of removing S
If MgO reacts with iron ore or FeO to form calcium ferrite (CaO・Fe 2 O 3 ), calcium silicate (CaO・SiO 2 ), etc., it is hardly possible to obtain the S removal function from pig iron.
そこで更に検討を重ね、この種高炉装入原料と
してのコークス中にCaO系、MgO系造滓剤を混
入して装入し、コークスと共に羽口レベルまで反
応させない状態で降下し、羽口先におけるコーク
スの燃焼によつて、例えば（CaO）＋Ｓ＋Ｃ→
（CaS）＋CO(g)〔註：（ ）はスラグ中、 はメタ
ル中、(g)はガス中〕の如く反応させ脱Ｓを図るも
のである。 Therefore, after further investigation, we mixed CaO-based and MgO-based slag-forming agents into coke as the raw material for charging this kind of blast furnace and charged it. For example, (CaO) + S + C →
(CaS) + CO(g) [Note: ( ) is in slag, (g) in a metal and (g) in a gas] to remove S.
このようにコークスに添加される造滓剤として
は、CaO（生石灰）、CaCO3（石灰石）、CaCO3・
MgCO3（生ドロマイト）、Ca（OH）2（消石灰）、
CaC2（カルシウムカーバイト）、MgO・SiO2（カ
ンラン岩）、Mg（OH）2（水酸化マグネシウム）、
MgCO3（炭酸マグネシウム）などがあり、これら
の何れのものを用いても好ましい脱Ｓが図られ
る。脱Ｓの具体例としてCaOおよびMgOをコー
クス中に添加した場合において第１図に示す如く
であり、何れの場合においても10〜50Kg／Ｔ・
Pigのコークス中添加で略直線的に銑鉄中Ｓ分を
低減することができ、Ｓ分を0.01％ないしそれ以
下とすることができる。 Slag-forming agents added to coke include CaO (quicklime), CaCO 3 (limestone), CaCO 3 .
MgCO 3 (raw dolomite), Ca(OH) 2 (slaked lime),
CaC 2 (calcium carbide), MgO・SiO 2 (olivine), Mg(OH) 2 (magnesium hydroxide),
Examples include MgCO 3 (magnesium carbonate), and any of these can be used to achieve preferable S removal. A specific example of S removal is shown in Figure 1 when CaO and MgO are added to coke.
By adding Pig to coke, the S content in pig iron can be reduced approximately linearly, and the S content can be reduced to 0.01% or less.
本発明によるものの具体的な操業例について説
明すると以下の如くである。 A specific example of operation according to the present invention will be described below.
有効内容積が2900m3の高炉に対しコークスを
510Kg／Ｔ・Pigと鉱石および焼結鉱を1630Kg／
Ｔ・Pigの割合で装入し、出銑量を6500t／dayと
して操業するに当つてその装入コークス層に対し
CaOを37Kg／Ｔ・Pigの割合で混入したときの銑
中Ｓは0.020％であつて、該造滓剤を添加しない
場合の0.038％に比しＳ分を大幅に低下すること
ができた。 Coke to a blast furnace with an effective internal volume of 2900m3
510Kg/T・Pig and ore and sintered ore 1630Kg/
When operating at a charging rate of T/Pig and a tapping rate of 6500t/day,
When CaO was mixed at a ratio of 37 kg/T.Pig, the S content in the pig iron was 0.020%, which was significantly lower than the 0.038% when the slag forming agent was not added.
「発明の効果」
以上説明したような本発明によるときはこの種
高炉操業に当つて銑鉄中Ｓ分を有効に低減せし
め、比較的僅少なCaO系又はMgO系造滓剤のコ
ークス中混入によりＳ分を著しく低減した銑鉄を
得ることができるものであり、設備的損耗の如き
も全くない等、工業的にその効果の大きい発明で
ある。"Effects of the Invention" According to the present invention as explained above, the S content in pig iron can be effectively reduced in this type of blast furnace operation, and the S content can be reduced by mixing a relatively small amount of CaO-based or MgO-based slag forming agent into coke. It is possible to obtain pig iron with significantly reduced carbon content, and there is no wear and tear on equipment, making this invention highly effective industrially.
図面は本発明の実施態様を示すもので、装入コ
ークス中におけるCaO系およびMgO系造滓剤の
添加量と得られる銑鉄中Ｓ分との関係を示した図
表である。
The drawing shows an embodiment of the present invention, and is a chart showing the relationship between the amounts of CaO-based and MgO-based slag forming agents added to charged coke and the S content in the resulting pig iron.
Claims (1)
て装入し、羽口からの熱風吹込みにより前記鉱石
を予熱、還元、軟化、溶融せしめて出銑するに当
り、前記コークス中にCaO系又はMgO系造滓を
添加することを特徴とする低Ｓ高炉操業法。1. When ore and coke are charged into a blast furnace in alternating layers and the ore is preheated, reduced, softened, and melted by blowing hot air from the tuyere and tapped, CaO-based or coke is added to the coke. A low S blast furnace operating method characterized by adding MgO-based slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27337084A JPS61153209A (en) | 1984-12-26 | 1984-12-26 | Low-s operation method in blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27337084A JPS61153209A (en) | 1984-12-26 | 1984-12-26 | Low-s operation method in blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61153209A JPS61153209A (en) | 1986-07-11 |
| JPS6365728B2 true JPS6365728B2 (en) | 1988-12-16 |
Family
ID=17526953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27337084A Granted JPS61153209A (en) | 1984-12-26 | 1984-12-26 | Low-s operation method in blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61153209A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0545615Y2 (en) * | 1989-11-21 | 1993-11-24 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028310A (en) * | 1988-06-25 | 1990-01-11 | Nkk Corp | Low si operating method in blast furnace |
| JP4551266B2 (en) * | 2005-04-12 | 2010-09-22 | 新日本製鐵株式会社 | Blast furnace operation method |
| JP5012138B2 (en) * | 2007-03-28 | 2012-08-29 | 住友金属工業株式会社 | Blast furnace operation method |
-
1984
- 1984-12-26 JP JP27337084A patent/JPS61153209A/en active Granted
Non-Patent Citations (1)
| Title |
|---|
| STAHL UND EISEN=1961 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0545615Y2 (en) * | 1989-11-21 | 1993-11-24 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61153209A (en) | 1986-07-11 |
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