JPH0328312A - Method for blowing solid carbon or aluminum ash or flux to molten steel in electric furnace steel making - Google Patents
Method for blowing solid carbon or aluminum ash or flux to molten steel in electric furnace steel makingInfo
- Publication number
- JPH0328312A JPH0328312A JP1161748A JP16174889A JPH0328312A JP H0328312 A JPH0328312 A JP H0328312A JP 1161748 A JP1161748 A JP 1161748A JP 16174889 A JP16174889 A JP 16174889A JP H0328312 A JPH0328312 A JP H0328312A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- gas
- carbon
- electric furnace
- solid carbon
- 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.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 36
- 239000007787 solid Substances 0.000 title claims abstract description 16
- 230000004907 flux Effects 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 title claims description 9
- 238000009628 steelmaking Methods 0.000 title claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 6
- 229910052782 aluminium Inorganic materials 0.000 title claims description 6
- 238000007664 blowing Methods 0.000 title abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 33
- 239000012159 carrier gas Substances 0.000 claims abstract description 16
- 239000000571 coke Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052742 iron Inorganic materials 0.000 abstract description 4
- 229930195733 hydrocarbon Natural products 0.000 abstract description 2
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 230000008018 melting Effects 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000004215 Carbon black (E152) Substances 0.000 abstract 1
- 238000011109 contamination Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 26
- 238000007796 conventional method Methods 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
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
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は鉄鋼業、特に電気炉による製鋼に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to the steel industry, particularly to steel manufacturing using an electric furnace.
［従来の技術コ
電気炉製鋼の主原料は鉄屑である．そのため、溶鋼中の
炭素濃度は、使用した鉄屑中の炭素濃度によって決まっ
てしまう。そこで、鋼中の炭素濃度を上げる必要のある
場合には、何等がの手段で溶鋼中へ炭素を添加しなけれ
ばならない。[Conventional technology: The main raw material for electric furnace steelmaking is scrap iron. Therefore, the carbon concentration in molten steel is determined by the carbon concentration in the iron scrap used. Therefore, if it is necessary to increase the carbon concentration in steel, carbon must be added to molten steel by some means or other.
電気炉溶鋼中への炭素添加方法として、ｈｔ来から固体
炭素を溶鋼中に吹込むことが行われている。BACKGROUND OF THE INVENTION As a method of adding carbon to molten steel in an electric furnace, solid carbon has been injected into molten steel since 2010.
固体炭素を吹込む際のキャリヤーガスは、通例、空気ま
たは窒素ガスである．
［発明が解決しようとする課題］
上記のような空気または窒素ガスによる固体炭素の吹込
みには、以下のような問題点があった。The carrier gas when blowing solid carbon is usually air or nitrogen gas. [Problems to be Solved by the Invention] The above-described blowing of solid carbon with air or nitrogen gas has the following problems.
第１の問題点は、空気中の窒素が高温の溶鋼から熱を奪
うので、その分の熱補償をしなければならないという事
があげられる。この問題も窒素ガスを用いた場合には、
より顕著になる．第２には、炭素を固体で吹込むので、
炭素が溶鋼中へ溶解する反応は固体一液体反応となり、
反応度が遅く、かつ炭素の歩留りが悪いということであ
る。The first problem is that nitrogen in the air takes away heat from the high-temperature molten steel, so it is necessary to compensate for that amount of heat. This problem also occurs when nitrogen gas is used.
It becomes more noticeable. Second, since carbon is injected in solid form,
The reaction in which carbon dissolves into molten steel is a solid-liquid reaction.
This means that the reactivity is slow and the yield of carbon is poor.
第３には空気中の窒素が溶鋼中へ溶解し、鋼の品質を低
下させることである。この問題は窒素ガスを用いた場合
には特に顕著である．
そこで、本発明者らは以上の三つの問題点を解消するこ
とを目的として研究を重ね、本発明を完成させるに至っ
た。Thirdly, nitrogen in the air dissolves into the molten steel, reducing the quality of the steel. This problem is particularly noticeable when nitrogen gas is used. The inventors of the present invention have conducted extensive research aimed at solving the above three problems, and have completed the present invention.
［課題を解決するための手段］
上記目的を達成するために、本発明者はキャリヤーガス
として、空気あるいは窒素ガスの代わりに、コークス炉
、高炉あるいは転炉から発生するガス〈以下Ｃガスとい
う）を単独もしくは混合しキャリヤーガスとして、炭素
を添加するための固体炭素の搬送、又はアルミ灰、ある
いはフラックスを電気炉内の溶鋼中に吹込むようにした
ものである。[Means for Solving the Problems] In order to achieve the above object, the present inventor used gas (hereinafter referred to as C gas) generated from a coke oven, blast furnace or converter as a carrier gas instead of air or nitrogen gas. Either alone or in combination as a carrier gas, solid carbon is transported to add carbon, or aluminum ash or flux is blown into molten steel in an electric furnace.
［作用］
前記Ｃガスをキャリヤーガスとして固体炭素を電気炉内
に吹込むと、このガスには従来搬送ガスとして用いられ
ている空気、又は窒素ガスに比べガス組成中の窒素が極
度に少ないため、窒素が溶鋼中の熱を奪ったり、溶鋼中
に溶解して鋼の品質を低下する等の影響が小さく、溶鋼
中の窒素濃度を在来法より低減することができると共に
、ガス中に含まれる一酸１ヒ炭素ガス等の可燃性ガスが
溶鋼への吹込み中に一部が燃焼し、熱源となるため電気
製鋼における電力原単位を低減することができる。[Operation] When solid carbon is blown into an electric furnace using the C gas as a carrier gas, this gas contains extremely less nitrogen in the gas composition than air or nitrogen gas, which is conventionally used as a carrier gas. , the effect of nitrogen taking heat away from molten steel or dissolving into molten steel and reducing the quality of the steel is small, and the nitrogen concentration in molten steel can be reduced compared to conventional methods. A part of the combustible gas such as monoacid, monoarsenic, and carbon gas is combusted while being blown into the molten steel and becomes a heat source, thereby reducing the power consumption rate in electric steelmaking.
また、搬送される固体炭素のみならず、Ｃガス中に含ま
れるＣＯガス、ＣＯ２ガスあるいは炭１ヒ水素の分解に
よって生成され炭素も溶鋼中に溶解することにより、炭
素濃度を０．１重量％上昇させるに必要な時間を短縮す
ることができる。In addition, not only the solid carbon transported, but also the CO gas, CO2 gas contained in the C gas, or the carbon generated by the decomposition of carbon 1 arsenide, is dissolved in the molten steel to reduce the carbon concentration to 0.1% by weight. The time required for raising can be shortened.
また、アルミ灰、フラックスも前記と同様のＣガスをキ
ャリヤーガスとして搬送し吹込むことにより、上記の従
来法の第１及び第３の問題点が解消されることを見出だ
した．
［実施例］
実施例について図面を参照して説明する。It has also been found that the first and third problems of the conventional method described above can be solved by transporting and injecting aluminum ash and flux with the same C gas as the carrier gas. [Example] An example will be described with reference to the drawings.
電気炉製鋼において、コークス炉から発生したガス（Ｃ
ガス）を単独若しくは混合し、所定に圧力を高めたキャ
リヤーガスとして固体炭素を吹込み用ランスパイブ３を
通じて数本の電極２を備えた電気炉１中に吹込み、溶鋼
へ炭素を添加する．以下の第１表に実施例において使用
したＣガスの組成を示す。In electric furnace steelmaking, gas (C
Solid carbon is injected into the electric furnace 1 equipped with several electrodes 2 through the injection lance pipe 3 to add carbon to the molten steel. Table 1 below shows the composition of C gas used in the examples.
第１表 Ｃガスの組成（体積％）
本実施例ではコークス炉から発生したガスを使用したが
、高炉あるいは転炉から発生するガスを単独若しくは混
合して用いてもよい．また、第１表に示す組成は本発明
の一実施例を示すに過ぎない。Table 1 Composition of C gas (volume %) Although gas generated from a coke oven was used in this example, gases generated from a blast furnace or a converter may be used alone or in combination. Furthermore, the compositions shown in Table 1 merely represent one embodiment of the present invention.
吹込みに当たっては、固体炭素とキャリヤーガスとの混
合比は従来法と同一とし固体炭素１ ｋｇに対し、キャ
リヤーガス０．０５ＮＭ５とした。During the blowing, the mixing ratio of solid carbon and carrier gas was the same as in the conventional method, and the carrier gas was 0.05NM5 per 1 kg of solid carbon.
さらに、他の実施例として第１表に示す組成のＣガスを
キャリヤーガスとして溶ｔＲ中へアルミ灰，あるいはフ
ラックスを吹込むのに使用することができる。Furthermore, as another example, C gas having the composition shown in Table 1 can be used as a carrier gas to blow aluminum ash or flux into the molten tR.
［発明の効果］
以上のように本発明を実施したところ、以下の効果があ
ることがわかった．
まず、電気炉で溶解した後の鋼中の窒素濃度について、
従来法即ち空気をキャリヤーガスとして使用した場合と
本発明による方法とを比較して第１図に示す．
従来法では鋼中窒素濃度の平均値は０．００９重量％で
あったが、本発明を実施すると鋼中窒素濃度が０．００
７重量％まで低減する．次に電気炉製鋼における電力原
単位について第２図に、従来法と本発明を比較した．本
発明の実施例により、電力原単位がほぼ９２％に低減し
た。[Effects of the Invention] When the present invention was implemented as described above, it was found that the following effects were obtained. First, regarding the nitrogen concentration in steel after melting in an electric furnace,
Figure 1 shows a comparison between the conventional method, which uses air as a carrier gas, and the method according to the present invention. In the conventional method, the average value of nitrogen concentration in steel was 0.009% by weight, but by implementing the present invention, the nitrogen concentration in steel was reduced to 0.00% by weight.
Reduce to 7% by weight. Next, Figure 2 shows a comparison of the conventional method and the present invention regarding electric power consumption in electric furnace steelmaking. According to the embodiment of the present invention, the power consumption rate was reduced to approximately 92%.
これはＣガス中に含まれる一酸化炭素ガス等の可燃性ガ
スが溶鋼への吹込み中に一部燃焼し、熱源となるためで
ある。This is because combustible gas such as carbon monoxide gas contained in the C gas is partially combusted during injection into the molten steel and becomes a heat source.
さらに、炭素濃度を０，１重量％上昇させるに必要な所
要時間について、従来法と本発明による方法とを第３図
に比較し図示した。Furthermore, the time required to increase the carbon concentration by 0.1% by weight is illustrated in FIG. 3 by comparing the conventional method and the method according to the present invention.
本発明の実施により、炭素濃度を０．１重量％上昇させ
るに必要な時間が、８％短縮されることがわかった。こ
れは固体炭素のみならず、Ｃガス中に含まれるＣＯガス
、ＣＯ２ガスあるいは炭化水素の分解によって生成した
炭素も溶鋼中へ溶解することによるものである。It has been found that by practicing the present invention, the time required to increase carbon concentration by 0.1% by weight is reduced by 8%. This is because not only solid carbon but also carbon generated by decomposition of CO gas, CO2 gas, or hydrocarbons contained in the C gas is dissolved into the molten steel.
以上のように、本発明を実施すれば、溶鋼中の窒素濃度
を抑制することができ、また電力原単位を低減し、かつ
反応速度を早くすることができるので、その工業的価値
は多大である。As described above, by carrying out the present invention, it is possible to suppress the nitrogen concentration in molten steel, reduce the electric power consumption rate, and increase the reaction rate, so its industrial value is great. be.
第１図は本発明方法と従来法による溶鋼中窒素濃度を重
量％で示す比較図、第２図は本発明方法と従来法による
電力原単位を、従来法を１００％とした相対値で示す比
較図、第３図は鋼中の炭素濃度を０．１重量％上昇させ
るに必要な所要時間を、従来法を１００％とした相対値
で示した本発明との比較図、第４図は本発明に使用する
電気炉断面概略図、第５図は横断平面図である．１・・
・電気炉本木、２・・一電極、３・・・吹込み用ランス
。Figure 1 is a comparison diagram showing the nitrogen concentration in molten steel in weight percent between the method of the present invention and the conventional method. Figure 2 shows the power consumption rate of the method of the present invention and the conventional method as a relative value with the conventional method as 100%. Comparison diagram, Figure 3 is a comparison diagram with the present invention showing the time required to increase the carbon concentration in steel by 0.1% by weight, with the conventional method as 100%, and Figure 4 is a comparison diagram with the present invention. A schematic cross-sectional view of the electric furnace used in the present invention, and FIG. 5 is a cross-sectional plan view. 1...
・Electric furnace main wood, 2... one electrode, 3... lance for blowing.
Claims (2)
転炉から発生するガスを単独もしくは混合しキャリヤー
ガスとして固体炭素を電気炉に吹込むことを特徴とする
溶鋼への固体炭素吹込み法。(1) In electric furnace steelmaking, a method for injecting solid carbon into molten steel, which is characterized by injecting solid carbon into the electric furnace as a carrier gas using gases generated from a coke oven, a blast furnace, or a converter, either singly or in a mixture.
転炉から発生するガスを単独もしくは混合しキャリヤー
ガスとしてアルミ灰を吹込むことを特徴とするアルミ灰
吹込み法。（３）電気炉製鋼において、コークス炉、高
炉あるいは転炉から発生するガスを単独もしくは混合し
キャリヤーガスとして溶鋼中にフラックスを吹込むこと
を特徴とするフラックス吹込み法。(2) In electric furnace steelmaking, an aluminum ash injection method characterized by injecting aluminum ash as a carrier gas into the gas generated from a coke oven, blast furnace, or converter, either alone or in a mixture. (3) In electric furnace steelmaking, a flux injection method characterized by injecting flux into molten steel as a carrier gas using gases generated from a coke oven, blast furnace, or converter, either singly or in combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1161748A JPH0328312A (en) | 1989-06-24 | 1989-06-24 | Method for blowing solid carbon or aluminum ash or flux to molten steel in electric furnace steel making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1161748A JPH0328312A (en) | 1989-06-24 | 1989-06-24 | Method for blowing solid carbon or aluminum ash or flux to molten steel in electric furnace steel making |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0328312A true JPH0328312A (en) | 1991-02-06 |
Family
ID=15741138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1161748A Pending JPH0328312A (en) | 1989-06-24 | 1989-06-24 | Method for blowing solid carbon or aluminum ash or flux to molten steel in electric furnace steel making |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0328312A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101388063B1 (en) * | 2012-06-28 | 2014-04-22 | 현대제철 주식회사 | Method for foaming slag in electric furnace |
| CN116178033A (en) * | 2023-04-24 | 2023-05-30 | 常熟理工学院 | Method for preparing refractory brick by using aluminum ash and product thereof |
-
1989
- 1989-06-24 JP JP1161748A patent/JPH0328312A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101388063B1 (en) * | 2012-06-28 | 2014-04-22 | 현대제철 주식회사 | Method for foaming slag in electric furnace |
| CN116178033A (en) * | 2023-04-24 | 2023-05-30 | 常熟理工学院 | Method for preparing refractory brick by using aluminum ash and product thereof |
| CN116178033B (en) * | 2023-04-24 | 2023-07-21 | 常熟理工学院 | Method for preparing refractory brick by using aluminum ash and product thereof |
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