JPS6365729B2 - - Google Patents
Info
- Publication number
- JPS6365729B2 JPS6365729B2 JP59271880A JP27188084A JPS6365729B2 JP S6365729 B2 JPS6365729 B2 JP S6365729B2 JP 59271880 A JP59271880 A JP 59271880A JP 27188084 A JP27188084 A JP 27188084A JP S6365729 B2 JPS6365729 B2 JP S6365729B2
- Authority
- JP
- Japan
- Prior art keywords
- tuyere
- slag
- blast furnace
- slurry
- forming agent
- 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
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 10
- 239000002893 slag Substances 0.000 claims description 5
- 239000000571 coke Substances 0.000 claims description 4
- 238000011017 operating method Methods 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 238000006477 desulfuration reaction Methods 0.000 description 7
- 230000023556 desulfurization Effects 0.000 description 7
- 229910000805 Pig iron Inorganic materials 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 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
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
- C21B5/004—Injection of slurries
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
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
る中に鉄鉱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. It has been confirmed that the sulfur is absorbed by iron ores as it rises, and then the slag must 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」
門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、前記した羽口先にスラリー状とされたCaO系
又はMgO系造滓剤を吹き込むことを特徴とする
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. A low S blast furnace operating method characterized by injecting a CaO-based or MgO-based slag-forming agent in the form of slurry into the tip of the tuyere during tapping.
作 用
水などによつてスラリー状をなした造滓剤は分
散することなく集中状態で羽口先高温部に添加さ
れ、従つて該高温部で造滓剤の効率的な脱Ｓ反応
が得られる。上記のように集中してスラリー状で
添加される造滓剤は羽口を損耗することも少い。Function: The slag-forming agent, which has been made into a slurry with water, is added to the high-temperature section at the tip of the tuyere in a concentrated state without being dispersed, and an efficient S-removal reaction of the slag-forming agent can therefore be achieved in the high-temperature section. . The sludge-forming agent added in concentrated slurry form as described above causes less damage to the tuyeres.
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は鉄鉱石が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 iron ore reacts with FeO to form calcium ferrite (CaO・Fe 2 O 3 ), calcium silicate (CaO・SiO 2 ), etc., then MgO can hardly be expected to have a S removal function in pig iron.
そこで更に羽口先への造滓剤吹込みについて検
討を重ね、上記のような石灰石の吹込み状況につ
いて仔細に観察すると、前記吹込みのための石炭
石などは一般的に径２mm以下程度の粒子であり、
このものが熱風によつて吹込まれた場合には羽口
先において相当の広範囲に分散することは明か
で、羽口先高温部に的確でロスの少い状態に導入
することは困難である。即ち斯うして分散した
CaOなどはCaSやMgSのようにガス中Ｓ分を吸
収することにならず、その作用が効率的でない。
しかも上記のように分散して吹込まれる造滓剤粒
子は羽口端部に衝突して速度エネルギーを伴つた
砂粒状に作用し、羽口を研削してその損耗を著し
く大きくする。 Therefore, we further investigated the injection of slag-forming agent into the tip of the tuyere, and when we closely observed the conditions of limestone injection as described above, we found that the coal stone used for the injection is generally composed of particles with a diameter of about 2 mm or less. and
It is clear that when this material is blown in by hot air, it is dispersed over a fairly wide range at the tuyere tip, and it is difficult to introduce it into the high-temperature part of the tuyere tip in an accurate manner with little loss. That is, it was thus dispersed
CaO and the like do not absorb S in the gas like CaS and MgS, and their action is not efficient.
Furthermore, the sludge particles that are dispersed and blown in as described above collide with the end of the tuyere and act like sand grains with velocity energy, grinding the tuyere and significantly increasing its wear.
これらの検討結果として創案された本発明では
前記のような造滓剤をスラリー状として吹込むも
ので、水などの液体でスラリー状化された造滓剤
は液分による凝集作用でその分散性が殆んどなく
なり、集中的に羽口先高温部に導入される。この
ように集中状となることにより羽口端部に対する
研削的な損耗も大きく低減される。 In the present invention, which was created as a result of these studies, the above-mentioned slag-forming agent is injected in the form of a slurry. is almost completely eliminated and is intensively introduced into the high temperature area at the tuyere tip. This concentration greatly reduces grinding wear on the tuyere end.
造滓剤の吹込み量としては熱風に対し５〜100
ｇ／Ｎm3で、スラリー中造滓剤濃度は５〜70％の
範囲で適宜に実施でき、石灰系造滓剤としては
Ca（OH）2、CaCO3、CaC2、CaCO3・MgCO3な
どがある。MgO系造滓剤としても従来から知ら
れているものを適宜に採用してよい。具体的にこ
れらの造滓剤を用いたスラリーを羽口先に吹込
み、スラリー吹込量を40ｇ／Ｎm3とした場合のス
ラリー中造滓剤濃度とそれによる脱硫率を求めた
結果は添附図面に示す通りであり、それぞれの造
滓剤により若干の相異があるとしても、何れも従
来法の限界である92％以上の脱Ｓ率を得ることが
可能で、造滓剤濃度を30〜40％とすることにより
95％以上の脱硫率を得しめる。 The amount of slag-forming agent blown into the hot air is 5 to 100.
g/ Nm3 , the sludge concentration in the slurry can be carried out appropriately in the range of 5 to 70%, and as a lime-based slag agent,
Examples include Ca(OH) 2 , CaCO 3 , CaC 2 , CaCO 3 and MgCO 3 . Conventionally known MgO-based sludge-forming agents may be used as appropriate. Specifically, the results of determining the concentration of the slag-forming agent in the slurry and the resulting desulfurization rate when a slurry using these slag-forming agents was injected into the tip of the tuyere and the slurry injection amount was 40 g/Nm 3 are shown in the attached drawing. As shown, even though there are some differences depending on the sludge forming agent, it is possible to obtain a S removal rate of 92% or more, which is the limit of the conventional method, with each sludge forming agent at a concentration of 30 to 40%. By setting it as %
Achieves a desulfurization rate of 95% or more.
「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、効率的な脱硫を図り、従来法における限界を
超えた好ましい脱Ｓ結果を得しめるものであり、
しかも設備的損耗の如きも適切に縮減し得るもの
であるから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, it is possible to effectively reduce the S content in pig iron in this type of blast furnace operation, achieve efficient desulfurization, and achieve a preferable desulfurization that exceeds the limits of conventional methods. It is something that will get you results,
Furthermore, it is an invention that is industrially very effective because it can appropriately reduce equipment wear and tear.
図面は本発明の技術的内容を示すものであつ
て、本発明による各種造滓剤のスラリー中濃度と
脱硫率の関係を示した図表である。
The drawing shows the technical content of the present invention, and is a chart showing the relationship between the concentration of various slag-forming agents in a slurry and the desulfurization rate according to the present invention.
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、前記した羽口先にスラリー状とされたCaO系
又はMgO系造滓剤を吹き込むことを特徴とする
低Ｓ高炉操業法。1 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 when tapping, a slurry is poured into the tip of the tuyere. A low S blast furnace operating method characterized by injecting a CaO-based or MgO-based slag forming agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27188084A JPS61149403A (en) | 1984-12-25 | 1984-12-25 | Method for carrying out low-s operation of blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27188084A JPS61149403A (en) | 1984-12-25 | 1984-12-25 | Method for carrying out low-s operation of blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61149403A JPS61149403A (en) | 1986-07-08 |
| JPS6365729B2 true JPS6365729B2 (en) | 1988-12-16 |
Family
ID=17506188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27188084A Granted JPS61149403A (en) | 1984-12-25 | 1984-12-25 | Method for carrying out low-s operation of blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61149403A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4873958B2 (en) * | 2005-02-24 | 2012-02-08 | 京セラ株式会社 | High frequency device mounting board |
| JP5115253B2 (en) | 2008-03-10 | 2013-01-09 | 富士通株式会社 | Coaxial connector mounted circuit board and method for manufacturing coaxial connector mounted circuit board |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52109403A (en) * | 1976-03-10 | 1977-09-13 | Sumitomo Metal Ind Ltd | Production of auxiliary fuel for blast furnace |
| JPS579807A (en) * | 1980-06-19 | 1982-01-19 | Kawasaki Steel Corp | Method for blowing coal-water slurry into blast furnace |
| JPS57137403A (en) * | 1981-02-18 | 1982-08-25 | Kawasaki Steel Corp | Low-silicon operation method for blast furnace by mixed blowing of pulverized coal and basic material |
-
1984
- 1984-12-25 JP JP27188084A patent/JPS61149403A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52109403A (en) * | 1976-03-10 | 1977-09-13 | Sumitomo Metal Ind Ltd | Production of auxiliary fuel for blast furnace |
| JPS579807A (en) * | 1980-06-19 | 1982-01-19 | Kawasaki Steel Corp | Method for blowing coal-water slurry into blast furnace |
| JPS57137403A (en) * | 1981-02-18 | 1982-08-25 | Kawasaki Steel Corp | Low-silicon operation method for blast furnace by mixed blowing of pulverized coal and basic material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61149403A (en) | 1986-07-08 |
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