JPH11222620A - Melting furnace - Google Patents
Melting furnaceInfo
- Publication number
- JPH11222620A JPH11222620A JP10023608A JP2360898A JPH11222620A JP H11222620 A JPH11222620 A JP H11222620A JP 10023608 A JP10023608 A JP 10023608A JP 2360898 A JP2360898 A JP 2360898A JP H11222620 A JPH11222620 A JP H11222620A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- porous plug
- inert gas
- base
- melting 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.)
- Withdrawn
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
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、溶湯中に不活性
ガスをバブリングして溶湯中の不純物を前記不活性ガス
中に包含させて溶湯外に排出するようにした溶解炉に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melting furnace in which an inert gas is bubbled into a molten metal so that impurities in the molten metal are contained in the inert gas and discharged out of the molten metal.
【０００２】[0002]
【従来の技術】図２は従来例の構成を示し、（ａ）は溶
解炉の断面図、（ｂ）はポーラスプラグの断面図を示
す。この図２において、１は耐火物で構成されたるつ
ぼ、２は溶湯、３はるつぼ１の外周側に卷回して、溶湯
２中に誘導電流を誘起させてその誘起電流と溶湯の金属
抵抗とによるジュール熱により金属を加熱溶解する加熱
誘導コイル、４は耐火物中に無数の微細な気孔が形成さ
れるように構成した円錐台形のポーラスプラグ、５は前
記ポーラスプラグ４の側面、および底面を被服するカバ
ー、６は前記ポーラスプラグ４に不活性ガスを送気する
配管を示す。この図２において、耐火物で構成されたる
つぼ１とその外周側に卷回した誘導コイルとで構成した
溶解炉は通常るつぼ形誘導炉と呼ばれており、るつぼ１
の中に導電性の金属を投入して誘導コイル３に通電する
ことにより該導電性の金属中に誘導電流を誘起してその
ジュール熱により前記金属を溶解して溶湯２にする。そ
して、このるつぼ１の底部には溶湯２中に不活性ガスを
吹き込むポーラスプラグ４が側面および底面を一般構造
用鋼材で形成されたカバー５で被服され底から不活性ガ
スを送気する配管６に接続されて、装着されている。2. Description of the Related Art FIG. 2 shows the structure of a conventional example, in which (a) is a sectional view of a melting furnace, and (b) is a sectional view of a porous plug. In FIG. 2, 1 is a crucible made of a refractory, 2 is a molten metal, and 3 is wound on the outer peripheral side of the crucible 1 to induce an induced current in the molten metal 2 so that the induced current and the metal resistance of the molten metal are reduced. A heating induction coil for heating and melting the metal by Joule heat, 4 is a truncated conical porous plug configured to form countless fine pores in the refractory, 5 is a side surface and a bottom surface of the porous plug 4 The cover 6 to be coated is a pipe for supplying an inert gas to the porous plug 4. In FIG. 2, a melting furnace composed of a crucible 1 made of a refractory and an induction coil wound around the outer periphery thereof is usually called a crucible-type induction furnace.
A conductive metal is put into the conductive metal, and an electric current is induced in the conductive coil 3 to induce an induced current in the conductive metal. At the bottom of the crucible 1, a porous plug 4 for blowing an inert gas into the molten metal 2 is covered on its side and bottom with a cover 5 formed of a general structural steel material, and a pipe 6 for feeding the inert gas from the bottom. Is connected to and mounted.
【０００３】上記の構成において、るつぼ１内で溶解さ
れた溶湯２が例えば自動車用鋼板のスクラップ等の塗装
鋼板を含む場合、溶湯２内に前記鋼板の塗装材料に含ま
れる亜鉛、鉛等の不純物が混入して、溶湯２中でガス化
して溶湯２を鋳物にした際に欠陥を生じる恐れがあり、
溶解中にこれら不純物を除去することが望まれる。その
ために、この溶解炉では、るつぼ１の底部に装着したポ
ーラスプラグ４から配管６を介して不活性ガス（例えば
アルゴンガス）を溶湯２中に吹き込み、該不活性ガスの
気泡中にガス化した亜鉛や鉛の微粒子を包含させて溶湯
２外に排出することが行われる。このようなガスを溶湯
２中に吹き込むことをバブリングすると言う。In the above configuration, when the molten metal 2 melted in the crucible 1 includes, for example, a coated steel sheet such as scrap of a steel sheet for automobiles, the molten metal 2 contains impurities such as zinc and lead contained in the coating material of the steel sheet. May be mixed and gasified in the molten metal 2 to cause defects when the molten metal 2 is cast.
It is desirable to remove these impurities during dissolution. For this purpose, in this melting furnace, an inert gas (for example, argon gas) is blown into the molten metal 2 from a porous plug 4 mounted on the bottom of the crucible 1 via a pipe 6 to be gasified into bubbles of the inert gas. Draining of the molten metal 2 is performed by incorporating fine particles of zinc and lead. Injecting such a gas into the molten metal 2 is called bubbling.
【０００４】[0004]
【発明が解決しようとする課題】ところで従来の構成で
は、ポーラスプラグを側面および底面で被服するカバー
は、消耗品であり安価にするために一般構造用鋼材で形
成されているが、溶湯からの熱伝達により高温になり特
にカバーの底部が大気に晒されているので酸化して欠落
する。このように酸化欠落が生じると不活性ガスは溶湯
内に送気されなくなり、前記欠落部分から漏洩するので
ポーラスプラグを交換する必要が生じる。In the conventional construction, the cover for covering the porous plug with the side and bottom surfaces is a consumable product and is formed of a general structural steel material to reduce the cost. The heat is transferred to a high temperature and the bottom of the cover is exposed to the atmosphere, and is oxidized and lost. In this way, when the oxidation loss occurs, the inert gas is no longer fed into the molten metal and leaks from the missing portion, so that the porous plug needs to be replaced.
【０００５】しかしながら、通常ガスバブリングを行う
ために溶湯をその中に保持するとりべ等はとりべの耐火
物自身が短寿命であるのでポーラスプラグもその寿命に
見合う寿命であれば良く、カバーを安価な一般構造用鋼
材で形成していた。ところがるつぼ形誘導炉のるつぼ耐
火物の寿命は前記とりべなどのように煉瓦を組み上げて
構成した短寿命（２〜３日）の耐火物ではなく、炉内で
不定形の耐火物を築き固めて焼結して構成しており長寿
命（２〜３カ月）であるのでポーラスプラグを２〜３日
毎に交換していては保守費用が嵩み、操業率が低下する
問題がある。[0005] However, since the ladle or the like for holding the molten metal therein for performing gas bubbling usually has a short life of the refractory itself of the ladle, it is sufficient that the porous plug has a life corresponding to its life. It was made of inexpensive general structural steel. However, the life of the crucible-type refractory of a crucible-type induction furnace is not a short-lived (2 to 3 days) refractory constructed by assembling bricks such as the above-mentioned ladle, but an irregular-shaped refractory is built in the furnace. The porous plug has a long life (2 to 3 months), so that replacing the porous plug every 2 to 3 days increases maintenance costs and reduces the operation rate.
【０００６】この発明は上記課題を解決するためになさ
れたもので、その目的とするところは、ポーラスプラグ
の交換頻度を逓減して保守費用を削減し操業率を向上さ
せた溶解炉を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a melting furnace in which the frequency of replacement of porous plugs is gradually reduced to reduce maintenance costs and improve the operation rate. It is in.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に請求項１記載の発明は、溶湯中に不活性ガスを吹き込
んで、溶湯中の有害ガスおよび不純物を除去するガスバ
ブリングを行う溶解炉において、ガスを溶湯中に吹き込
むポーラスプラグは耐蝕性材料により形成したカバーに
より側面および底面を被服する。According to a first aspect of the present invention, there is provided a melting furnace for performing a gas bubbling for removing a harmful gas and impurities in a molten metal by blowing an inert gas into the molten metal. In the above, the porous plug that blows gas into the molten metal covers the side and bottom surfaces with a cover formed of a corrosion-resistant material.
【０００８】上記構成によりポーラスプラグを被服する
カバーは耐蝕性材料（例えばステンレス綱板）で構成さ
れるので高温下で大気中にされた場合でもカバーの酸化
の進行は、一般構造用鋼板に比べて非常に遅く、前記カ
バーが酸化欠落しにくくなりポーラスプラグの交換頻度
を逓減することが可能になる。[0008] Since the cover for covering the porous plug with the above configuration is made of a corrosion-resistant material (for example, a stainless steel plate), the oxidation of the cover, even when exposed to air at a high temperature, is more advanced than that of a general structural steel plate. Very slowly, the cover is less liable to be oxidized and the frequency of replacement of the porous plug can be gradually reduced.
【０００９】[0009]
【発明の実施の形態】図１はこの発明の実施の形態の主
要部の構成図を示す。この図１において、従来例と同一
の符号を付けた部材はおおよそ同一の機能を有するので
その説明は省略する。また、この発明のポーラスプラグ
が適用される溶解炉は従来例の図２（ａ）と略同一であ
るのでその説明は省略する。この図１において、４は耐
火物中に無数の微細な気孔が形成されるように構成した
円錐台形のポーラスプラグ、６は前記ポーラスプラグ４
に不活性ガスを送気する配管、７は前記ポーラスプラグ
４の側面、および底面を被服する、耐蝕性材料により形
成したカバーを示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a configuration diagram of a main part of an embodiment of the present invention. In FIG. 1, members denoted by the same reference numerals as those of the conventional example have approximately the same functions, and therefore description thereof will be omitted. The melting furnace to which the porous plug of the present invention is applied is substantially the same as that of the conventional example shown in FIG. In FIG. 1, reference numeral 4 denotes a truncated conical porous plug configured to form countless fine pores in a refractory, and 6 denotes the porous plug 4.
Reference numeral 7 denotes a pipe formed of a corrosion-resistant material, which covers the side and bottom surfaces of the porous plug 4.
【００１０】この図１において、溶解炉の底部に装着さ
れて炉内の溶湯中に不活性ガスを吹き込むポーラスプラ
グ４は側面および底面を耐蝕性材料（例えばステンレス
鋼板）で形成されたカバー７で被服され底から不活性ガ
スを送気する配管６に接続されている。上記の構成にお
いて、ポーラスプラグ４は耐蝕性材料で形成されたカバ
ー７で側面および底面を被服し、底面に配管６を接続し
た状態で溶解炉の底面に、該ポーラスプラグ４の上面が
炉内の溶湯に接するようにして装着されている。そし
て、該ポーラスプラグ４は、前記配管６に接続された図
示されていない不活性ガス供給源から不活性ガスを供給
されて、側面および底面は耐蝕性材料で被服されている
ので側面および底面に漏洩すること無く全不活性ガスを
その上面から溶湯内に供給する。溶湯内に供給された不
活性ガスは上下左右の全面から溶湯の圧力を受けて気泡
状になり、溶湯が例えば自動車用鋼板のスクラップ等を
含む場合、溶湯内に前記鋼板の塗装材料から混入した亜
鉛、鉛等の不純物を前記気泡内に取り込みながら上昇し
て、前記不純物とともに大気中に放散する。なお、この
ガスバブリングにより溶湯が攪拌され、誘導加熱コイル
による湯運動と相まって溶湯全体をガスガブリングす
る。In FIG. 1, a porous plug 4 mounted on the bottom of a melting furnace for blowing an inert gas into the molten metal in the furnace has a cover 7 whose side and bottom surfaces are formed of a corrosion-resistant material (for example, a stainless steel plate). It is connected to a pipe 6 that is coated and feeds an inert gas from the bottom. In the above configuration, the porous plug 4 is covered on its side and bottom with a cover 7 made of a corrosion-resistant material, and the upper surface of the porous plug 4 is placed inside the furnace with the pipe 6 connected to the bottom. It is attached so as to be in contact with the molten metal. The porous plug 4 is supplied with an inert gas from an inert gas supply source (not shown) connected to the pipe 6, and the side and bottom are covered with a corrosion-resistant material. The entire inert gas is supplied into the melt from the upper surface without leaking. The inert gas supplied into the molten metal becomes bubble-like under the pressure of the molten metal from all over the upper, lower, left and right, and when the molten metal includes, for example, scrap of a steel sheet for automobiles, the inert gas is mixed from the coating material of the steel sheet into the molten metal. The impurities, such as zinc and lead, rise while taking in the bubbles and dissipate into the atmosphere together with the impurities. The molten gas is stirred by the gas bubbling, and the whole molten metal is gas-gapped together with the molten metal movement by the induction heating coil.
【００１１】[0011]
【発明の効果】この発明によれば、ポーラスプラグは耐
蝕性材料で被服されているので高温下での酸化の進行が
遅れてポーラスプラグの長寿命化が図られて、るつぼ形
誘導炉のようにるつぼの耐火物の寿命が長い炉では、ポ
ーラスプラグを交換する頻度が減少して炉の操業率が向
上し、かつ保守費用が削減できる効果がある。According to the present invention, since the porous plug is coated with the corrosion-resistant material, the progress of the oxidation at high temperatures is delayed, and the life of the porous plug is extended, so that the porous plug is provided like a crucible induction furnace. In a furnace in which the life of the refractory of the crucible is long, the frequency of replacing the porous plug is reduced, the operation rate of the furnace is improved, and the maintenance cost can be reduced.
【図１】この発明の実施の形態の主要部分の構成図FIG. 1 is a configuration diagram of a main part of an embodiment of the present invention.
【図２】従来例の構成を示し、（ａ）は溶解炉の断面
図、（ｂ）はポーラスプラグの断面図2A and 2B show a configuration of a conventional example, in which FIG. 2A is a cross-sectional view of a melting furnace, and FIG. 2B is a cross-sectional view of a porous plug.
４ ポーラスプラグ ６ 配管 ７ カバー 4 Porous plug 6 Piping 7 Cover
Claims (1)
の有害ガスおよび不純物を除去するガスバブリングを行
う溶解炉において、ガスを溶湯中に吹き込むポーラスプ
ラグは耐蝕性材料により形成したカバーにより側面およ
び底面を被服することを特徴とする溶解炉。In a melting furnace for performing gas bubbling for removing harmful gases and impurities in a molten metal by blowing an inert gas into the molten metal, a porous plug for blowing a gas into the molten metal is provided by a cover formed of a corrosion-resistant material. A melting furnace characterized by coating the side and bottom surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10023608A JPH11222620A (en) | 1998-02-04 | 1998-02-04 | Melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10023608A JPH11222620A (en) | 1998-02-04 | 1998-02-04 | Melting furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11222620A true JPH11222620A (en) | 1999-08-17 |
Family
ID=12115336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10023608A Withdrawn JPH11222620A (en) | 1998-02-04 | 1998-02-04 | Melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11222620A (en) |
-
1998
- 1998-02-04 JP JP10023608A patent/JPH11222620A/en not_active Withdrawn
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