JP2949697B2 - Cast iron manufacturing method - Google Patents
Cast iron manufacturing methodInfo
- Publication number
- JP2949697B2 JP2949697B2 JP1862893A JP1862893A JP2949697B2 JP 2949697 B2 JP2949697 B2 JP 2949697B2 JP 1862893 A JP1862893 A JP 1862893A JP 1862893 A JP1862893 A JP 1862893A JP 2949697 B2 JP2949697 B2 JP 2949697B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- temperature
- cast iron
- arc furnace
- furnace
- 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 - Lifetime
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)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は鋳鉄の製造方法に関し，
特に溶解中の溶湯温度の均一化を図るとともに，加熱効
率を向上したアーク炉における鋳鉄の製造方法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing cast iron,
In particular, the present invention relates to a method for producing cast iron in an arc furnace in which the temperature of a molten metal during melting is made uniform and the heating efficiency is improved.
【０００２】[0002]
【従来の技術】従来，ア−ク炉による鋳鉄の製造は，鋼
屑，戻り屑，ダクタイル銑等の溶解材料をエルー式アー
ク炉へ装入し，溶解材料をカーボン電極への通電によっ
てアークを発生させて溶解，加熱し，規定の温度に達し
た後除滓し，炉内にて成分調整を行なってから出湯して
いた。アーク炉１０は図５に示すように，炉本体１１に
装入された溶解材料を変圧器１６を経由した電流により
カーボン電極１３によって電弧を発生させ，その熱源に
よって加熱し溶湯Ｐとするもので，出湯時には炉本体１
１を傾動して取鍋２０内へ出湯していた。2. Description of the Related Art Conventionally, in the production of cast iron using an arc furnace, melting materials such as steel chips, return chips, and ductile pigs are charged into an erew type arc furnace, and the molten materials are supplied with electricity to a carbon electrode to form an arc. It was generated, melted and heated, and after reaching the specified temperature, the slag was removed, and the components were adjusted in a furnace before tapping. As shown in FIG. 5, the arc furnace 10 generates an electric arc from the molten material charged in the furnace main body 11 by the carbon electrode 13 by an electric current passing through the transformer 16 and heats the molten material into a molten metal P by the heat source. , Furnace body 1 when tapping
1 was tilted and the hot water was poured into the ladle 20.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら，このよ
うなアーク炉による従来の方法では，粗悪なスクラップ
や戻り屑を大量に使用出来る利点がある反面，電力のみ
による溶解および加熱昇温を行なっているため，溶湯温
度の炉内不均一差が生じやすく，その結果，出湯後に炉
内に材料の溶け残りが起こることがあった。また，アー
ク炉は炉床が皿状となっており溶湯表面積に比べて深さ
が浅く，放熱面積が大きい。したがって，このような構
造上の理由に起因して加熱効率が悪く操業時間が長く溶
解コストが割高であった。However, in the conventional method using such an arc furnace, there is an advantage that a large amount of inferior scrap and return debris can be used, but melting and heating with only electric power are performed. As a result, non-uniform differences in the temperature of the molten metal in the furnace are likely to occur, and as a result, the material may remain undissolved in the furnace after tapping. The arc furnace has a dish-shaped hearth, and has a shallower depth and a larger heat radiation area than the surface area of the molten metal. Therefore, due to such structural reasons, the heating efficiency was poor, the operation time was long, and the melting cost was expensive.
【０００４】[0004]
【課題を解決するための手段】上に述べた課題を解決す
るために，本発明の鋳鉄の製造方法では，鋼屑，戻り
屑，ダクタイル銑等の溶解材料をアーク炉へ装入して溶
解・加熱・昇温を行なう鋳鉄の製造方法において，溶解
材料をアーク電極の通電により溶解するとともに，溶湯
温度が１４２０℃に達したときに溶湯内に酸素吹精を開
始し，溶湯温度が１５００℃以上に達したときに酸素吹
精を停止して除滓ならびに出湯，成分調整を行なうこと
とした。In order to solve the above-mentioned problems, in the method for producing cast iron of the present invention, molten materials such as steel chips, return chips, and ductile iron are charged into an arc furnace and melted. In the method for producing cast iron in which heating and heating are performed, the molten material is melted by energizing the arc electrode, and when the temperature of the molten metal reaches 1420 ° C., oxygen blowing is started in the molten metal and the temperature of the molten metal is increased to 1500 ° C. When the above conditions were reached, oxygen blowing was stopped to remove slag, tap water, and adjust components.
【０００５】[0005]
【作用】本発明においては，アーク炉へ溶解材料を装入
して通電し溶解を行ない，溶解期終了後加熱昇温期に入
って溶湯温度が１４２０℃に達した時点で，通電を続行
しながら溶湯中へ酸素吹精を行なうことにより，酸素と
溶湯中の炭素成分とが反応してＣＯガス発熱が起こり加
熱が加速されるとともに，酸素吹込みによる溶湯の撹拌
効果が向上し溶湯温度の均一化が促進される。溶湯温度
が１５００℃に達した時点で酸素の供給と通電をする。
出滓後取鍋に出湯し成分調整を行なう。According to the present invention, the molten material is charged into the arc furnace and energized to perform melting. When the melting temperature reaches 1420 ° C. after the melting period and the heating temperature rise period, the energization is continued. Oxygen blowing into the molten metal while the oxygen is being reacted with the carbon component in the molten metal to generate CO gas heat and accelerate the heating, and the stirring effect of the molten metal by the oxygen injection is improved and the temperature of the molten metal is increased. Uniformity is promoted. When the temperature of the molten metal reaches 1500 ° C., supply of oxygen and energization are performed.
After removing the slag, it is poured into a ladle to adjust the components.
【０００６】[0006]
【実施例】以下図面に基づいて本発明の実施例の詳細に
ついて説明する。図１〜図４は本発明の実施例に係り，
図１はアーク炉の概略縦断面図，図２は操業中の溶湯温
度変化を示す説明図，図３は従来法と本発明の昇温速度
比較図，図４は従来法と本発明の消費電力量比較図であ
る。図１に示すアーク炉１０は容量３０トン，変圧器の
トランス容量は１５０００ＫＶＡのエール炉式タイプ
で，ライニングは塩基性である。アーク炉１０へ装入す
る溶解材料は鋼屑５０％，戻り屑４０％，ダクタイル銑
１０％で構成され，アーク炉１０へ装入後，カーボン電
極１３へ送電を開始し加熱を行なう。製造工程は，図２
に示すように，常温より１４２０℃までカーボン電極１
３のみで加熱し，１４２０℃に達した時点でカーボン電
極加熱と同様に酸素ボンベ１９ａに連通した酸素吹込パ
イプ１９を出滓口１９よりアーク炉１０内へ入れ，溶湯
Ｐの液面へ入射角が約３０゜となるように深さ５００ｍ
ｍまで先端を没入して酸素ガスを吹込む。溶湯Ｐ中に含
有されるカーボンは吹込まれた酸素と反応して酸化発熱
反応を起こし，溶湯温度は急激に上昇する。溶湯温度が
１５００℃を越えた時点で酸素吹精を停止し，アーク炉
１０を傾動して除滓を行なった後，アーク炉を傾動して
出湯口１８より出湯を行ない，取鍋２０内へ注入する。
その後，成分調整を行なってから取鍋２０をクレーンに
より吊り上げて，台車上２０ａに移動させ所望の鋳型へ
溶湯を鋳込みする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 relate to an embodiment of the present invention.
FIG. 1 is a schematic vertical sectional view of an arc furnace, FIG. 2 is an explanatory view showing a change in molten metal temperature during operation, FIG. 3 is a comparison diagram of a heating rate between the conventional method and the present invention, and FIG. It is an electric energy comparison figure. The arc furnace 10 shown in FIG. 1 is an ale furnace type with a capacity of 30 tons and a transformer capacity of 15000 KVA, and the lining is basic. The molten material to be charged into the arc furnace 10 is composed of 50% steel scrap, 40% return scrap, and 10% ductile pig iron. After charging into the arc furnace 10, power transmission to the carbon electrode 13 is started and heating is performed. The manufacturing process is shown in FIG.
As shown in FIG.
3 and, when the temperature reaches 1420 ° C., the oxygen blowing pipe 19 connected to the oxygen cylinder 19 a is introduced into the arc furnace 10 from the slag port 19 in the same manner as the heating of the carbon electrode, and the incident angle to the liquid surface of the molten metal P is obtained. 500m deep so that is about 30mm
m and the oxygen gas is blown into the tip. The carbon contained in the molten metal P reacts with the injected oxygen to cause an oxidative exothermic reaction, and the temperature of the molten metal rapidly rises. When the temperature of the molten metal exceeds 1500 ° C., the oxygen blowing is stopped, the arc furnace 10 is tilted to remove slag, and then the arc furnace is tilted to discharge water from the tap hole 18 and into the ladle 20. inject.
After the components are adjusted, the ladle 20 is lifted by a crane, moved to the carriage 20a, and the molten metal is cast into a desired mold.
【０００７】以上のようにして，本発明の方法では酸素
吹精によって図３に示すように昇温速度を上昇し，この
結果，従来昇温期に約２０分かかっていた時間を約１０
分に短縮して製造工程を短縮するとともに，消費電力量
は従来のものにくらべて図４に示すように大幅に低減さ
れる。また，酸素吹精の溶湯の撹拌効果により化学成分
や溶湯温度の均一化が図られ，溶け残りを減少するため
歩留りが向上し生産性が向上する。また，酸素吹込みに
伴う酸化に起因するガス欠陥やチル化傾向の増大などの
悪影響もほとんど見られなかった。As described above, in the method of the present invention, the heating rate is increased by oxygen blowing as shown in FIG. 3, and as a result, the time required for about 20 minutes in the conventional heating period is reduced to about 10 minutes.
In addition to shortening the manufacturing process by reducing the number of minutes, the power consumption is greatly reduced as shown in FIG. Further, the chemical composition and the temperature of the molten metal are made uniform by the stirring effect of the molten metal of oxygen blowing, and the yield is improved because the unmelted residue is reduced, thereby improving the productivity. In addition, there were almost no adverse effects such as gas defects and an increase in the tendency to chill due to oxidation caused by oxygen injection.
【０００８】[0008]
【発明の効果】以上述べたように，本発明の方法によれ
ば，化学成分や溶湯温度の均一化が図られ，製造サイク
ルが短縮され，生産性が向上するとともに溶解コスト低
減が達成される。As described above, according to the method of the present invention, the chemical composition and the temperature of the molten metal are made uniform, the production cycle is shortened, the productivity is improved, and the melting cost is reduced. .
【図１】本発明の実施例に係るアーク炉の概略縦断面図
である。FIG. 1 is a schematic vertical sectional view of an arc furnace according to an embodiment of the present invention.
【図２】本発明の実施例に係る操業中の溶湯温度変化を
示す説明図である。FIG. 2 is an explanatory diagram showing a change in molten metal temperature during operation according to the embodiment of the present invention.
【図３】本発明と従来法の昇温速度比較図である。FIG. 3 is a diagram illustrating a comparison between a heating rate of the present invention and a conventional method.
【図４】本発明と従来法の消費電力量比較図である。FIG. 4 is a power consumption comparison diagram of the present invention and a conventional method.
【図５】従来のアーク炉の全体縦断面図である。FIG. 5 is an overall vertical sectional view of a conventional arc furnace.
１０ アーク炉 １１ 炉本体 １２ 炉ぶた １３ カーボン電極 １４ 電極クランプ １５ 炉ぶた上昇旋回装置 １６ 変圧器 １７ 出滓口 １８ 出湯口 １９ 酸素吹込パイプ １９ａ 酸素ボンベ ２０ 取鍋 ２０ａ 台車 Ｐ 溶湯 DESCRIPTION OF SYMBOLS 10 Arc furnace 11 Furnace main body 12 Furnace lid 13 Carbon electrode 14 Electrode clamp 15 Furnace lid raising turning device 16 Transformer 17 Slag outlet 18 Tap hole 19 Oxygen injection pipe 19a Oxygen cylinder 20 Ladle 20a Dolly P Melt
フロントページの続き (56)参考文献 特開 昭53−137012（ＪＰ，Ａ) 特開 昭59−159914（ＪＰ，Ａ) 特開 平３−107406（ＪＰ，Ａ) 特開 昭62−188716（ＪＰ，Ａ) 特公 昭56−32366（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) C21C 1/08 C21C 5/52 C22B 9/16 F27B 3/08 Continuation of the front page (56) References JP-A-53-137012 (JP, A) JP-A-59-159914 (JP, A) JP-A-3-107406 (JP, A) JP-A-62-188716 (JP) , A) JP-B-56-32366 (JP, B2) (58) Fields investigated (Int. Cl. 6 , DB name) C21C 1/08 C21C 5/52 C22B 9/16 F27B 3/08
Claims (1)
料をアーク炉へ装入して溶解・加熱・昇温を行なう鋳鉄
の製造方法において，溶解材料をアーク電極の通電によ
り溶解するとともに，溶湯温度が１４２０℃に達したと
きに溶湯内に酸素吹精を開始し，溶湯温度が１５００℃
以上に達したときに酸素吹精を停止して除滓ならびに出
湯，成分調整を行なう鋳鉄の製造方法。1. A method for manufacturing a cast iron in which molten materials such as steel chips, return chips, and ductile iron are charged into an arc furnace to melt, heat, and raise the temperature. When the temperature of the molten metal reaches 1420 ° C., oxygen blowing starts in the molten metal, and the temperature of the molten metal becomes 1500 ° C.
A method for producing cast iron in which oxygen blowing is stopped when the above is reached, and slag removal, tapping and component adjustment are performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1862893A JP2949697B2 (en) | 1993-02-05 | 1993-02-05 | Cast iron manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1862893A JP2949697B2 (en) | 1993-02-05 | 1993-02-05 | Cast iron manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06228621A JPH06228621A (en) | 1994-08-16 |
| JP2949697B2 true JP2949697B2 (en) | 1999-09-20 |
Family
ID=11976889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1862893A Expired - Lifetime JP2949697B2 (en) | 1993-02-05 | 1993-02-05 | Cast iron manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2949697B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103557689B (en) * | 2013-10-30 | 2015-02-18 | 贵州宏狮煤机制造有限公司 | Electric arc furnace and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5632366B2 (en) | 2008-05-13 | 2014-11-26 | ユナイティッド アラブ エミレーツ ユニヴァーシティ | Processing method of particulate material |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5770876U (en) * | 1980-10-16 | 1982-04-28 |
-
1993
- 1993-02-05 JP JP1862893A patent/JP2949697B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5632366B2 (en) | 2008-05-13 | 2014-11-26 | ユナイティッド アラブ エミレーツ ユニヴァーシティ | Processing method of particulate material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06228621A (en) | 1994-08-16 |
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