JPH0741875A - Method and apparatus for refining molten metal - Google Patents
Method and apparatus for refining molten metalInfo
- Publication number
- JPH0741875A JPH0741875A JP6111098A JP11109894A JPH0741875A JP H0741875 A JPH0741875 A JP H0741875A JP 6111098 A JP6111098 A JP 6111098A JP 11109894 A JP11109894 A JP 11109894A JP H0741875 A JPH0741875 A JP H0741875A
- Authority
- JP
- Japan
- Prior art keywords
- refining
- molten metal
- furnace
- container
- inert gas
- 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.)
- Granted
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
- Y02P10/25—Process efficiency
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は溶湯を、真空、または数
100Torr以下の不活性ガス雰囲気等の低酸素分圧雰囲気
下で精錬した後、大気圧付近でさらに精錬する溶湯の精
錬方法およびその装置に関するものである。BACKGROUND OF THE INVENTION The present invention uses a molten metal, a vacuum, or a number.
The present invention relates to a molten metal refining method and apparatus for refining in a low oxygen partial pressure atmosphere such as an inert gas atmosphere of 100 Torr or less and then further refining at around atmospheric pressure.
【０００２】[0002]
【従来の技術】真空または低酸素分圧雰囲気下での精錬
法（以下、真空または低酸素分圧下精錬と記す）では、
高レベルの清浄鋼等を容易に得ることができることから
広く用いられており、真空誘導加熱炉(ＶＩＦとも称さ
れる）はその一つの手段である。この真空または低酸素
分圧下精錬において、ある種の不純物は、それ自身また
は酸化物等の化合物となって、溶湯から蒸発、飛散また
は浮上して分離されることにより、精錬が進行する。そ
して、この場合、精錬が進行した状態では、溶湯中の不
純物（本発明で不純物とは不純元素や非金属介在物の原
因となる物質を総称する）を非常に低いレベルにするこ
とができる。2. Description of the Related Art In the refining method under vacuum or low oxygen partial pressure atmosphere (hereinafter referred to as refining under vacuum or low oxygen partial pressure),
It is widely used because high-level clean steel and the like can be easily obtained, and a vacuum induction heating furnace (also called VIF) is one of the means. In this refining under vacuum or low oxygen partial pressure, certain impurities become themselves or compounds such as oxides, and are evaporated, scattered or floated from the molten metal to be separated, whereby refining proceeds. Then, in this case, in the state where the refining has progressed, the impurities in the molten metal (impurities in the present invention are collectively referred to as substances causing impure elements or non-metallic inclusions) can be made to have a very low level.
【０００３】真空または低酸素分圧下精錬において、精
錬炉の炉壁フリーボード部分には蒸発、飛散成分の一部
が凝縮してスカム状に付着している。また、精錬炉中の
溶湯液面には、別種の蒸発できないドロス状等の不純成
分が浮上して分離されている。精錬炉の傾注により出湯
する場合、溶湯流によりこれらの付着物や浮遊物が洗い
流されて溶湯中に再度取り込まれ、溶湯中に再混入す
る。さらに、受湯容器である取鍋またはタンディシュの
内張り耐火物は、それが受湯前に十分加熱されていない
場合、活性ガス成分を吸着しており、またこの耐火物は
受湯後、真空または低酸素分圧下での処理により活性化
した溶湯と一部反応し、または溶湯に侵食されて、これ
ら活性ガス、反応生成物、侵食物により溶湯を汚染す
る。また、真空または低酸素分圧下精錬後、そのまま大
気圧に解放した場合、前記の蒸発できないドロス状等の
不純物は溶湯中に再溶解する。In refining under vacuum or low partial pressure of oxygen, a part of vaporized and scattered components is condensed and adhered to the freeboard portion of the refining furnace in the form of scum. Further, on the surface of the molten metal in the refining furnace, another kind of non-evaporable dross-like impure component floats and is separated. When tapping the smelting furnace, the deposits and suspended matter are washed away by the molten metal stream and taken into the molten metal again, and then remixed in the molten metal. In addition, the refractory lining of the ladle or tundish that is the hot water container adsorbs the active gas components if it is not heated sufficiently before the hot water is received, and this refractory also has a vacuum or low temperature after the hot water is received. It partially reacts with the molten metal activated by the treatment under the partial pressure of oxygen, or is corroded by the molten metal, and the molten metal is contaminated by these active gas, reaction products, and eroded food. In addition, when refining under atmospheric pressure or after refining under vacuum or low oxygen partial pressure, impurities such as dross that cannot be evaporated are redissolved in the molten metal.
【０００４】前記の再混入の防止方法として今日まで試
みられた方法には、精錬炉の炉底出湯を行なうととも
に、浮遊不純物の混入防止のため溶湯を一部炉内に残留
させる方法、インダクションスカル炉により溶湯を空中
出湯する方法、また、取鍋またはタンディッシュ内にお
いては、セラミックフィルタにより微小非金属介在物原
因物質を除去する方法などが提案され一部実用化されて
いるが、種々の制約があり、未だ広く採用されるに至っ
ていない。また、これらの方法はすべての再混入物質や
汚染物質等に対して有効ではないので、前記各再混入物
質等に対して有効ならしめるためには、これらを組み合
わせることが必要である。しかし、これらは組み合わせ
るほど、費用が嵩む等の問題を生ずる。The methods that have been tried up to now as methods for preventing re-mixing include tapping the bottom of a refining furnace and leaving a part of the molten metal in the furnace to prevent mixing of floating impurities. A method of discharging molten metal in the air with a furnace, and a method of removing fine nonmetallic inclusion-causing substances with a ceramic filter in a ladle or a tundish have been proposed and partially put into practical use. However, it has not been widely adopted yet. Further, since these methods are not effective for all remixed substances, pollutants, etc., it is necessary to combine them in order to be effective for each remixed substance, etc. However, the more they are combined, the more costly the problem arises.
【０００５】一方、真空精錬後、黒鉛電極アーク加熱方
式の取鍋精錬炉、ＡＳＥＡ−ＳＫＦ法などで再精錬する
ことで再混入物質等を除去することも考えられるが、こ
れらの方法では溶湯中への炭素のピックアップの問題が
生ずる。特開平4-318118号は、真空脱ガス処理により溶
湯を脱炭した後、sol.Al≧0.2wt%を含有させた状態で、
プラズマ加熱し、塩基度8以上のスラグの存在下で撹拌
し、脱硫する極低炭、極低硫鋼の製造方法を提案してい
る。On the other hand, after vacuum refining, it is possible to remove re-mixed substances by refining with a ladle refining furnace of graphite electrode arc heating system, ASEA-SKF method, etc., but in these methods, in the molten metal The problem of carbon pickup into Japanese Unexamined Patent Publication (Kokai) No. 4-318118, after decarburizing the molten metal by vacuum degassing, in a state containing sol.Al ≧ 0.2 wt%,
We have proposed a method for producing ultra-low carbon and ultra-low sulfur steel that is desulfurized by plasma heating and stirring in the presence of slag with a basicity of 8 or more.
【０００６】[0006]
【発明が解決しようとする課題】前記提案の方法は、特
殊鋼メーカにおけるごとく、取扱い材質や要求精錬レベ
ルが多岐にわたる場合、または比較的小容量の炉の場合
には不適当であることが判った。すなわち、材質、精錬
レベルによって真空脱ガス処理時間が大幅に変化し、か
つ予定時間より長引くことが多く、また小容量の炉の場
合、特に溶湯の温度低下のため、所期の真空脱ガス効果
が得られない場合が多いからである。また、真空誘導加
熱精錬炉等溶湯容器の内壁が直接真空にさらされる炉の
場合、その容器をそのまま使用すると、スカム状等の不
純物でスラグが大幅に汚染されるので、精錬効率が低
く、また特に高い到達精錬レベルを要求する場合には不
適当であることがわかった。It has been found that the proposed method is unsuitable when the materials to be handled and the required refining levels are wide, as in special steel manufacturers, or when the furnace has a relatively small capacity. It was That is, the vacuum degassing treatment time significantly changes depending on the material and refining level, and it often lasts longer than the scheduled time.In the case of a small capacity furnace, the desired vacuum degassing effect is especially due to the temperature drop of the molten metal. Is often not obtained. Further, in the case of a furnace in which the inner wall of a molten metal container such as a vacuum induction heating refining furnace is directly exposed to vacuum, if the container is used as it is, impurities such as scum will contaminate the slag significantly, resulting in low refining efficiency. It has been found to be unsuitable if a particularly high ultimate refining level is required.
【０００７】すなわち、容器を更新することなく、造滓
剤を添加すると、スラグの液面レベルが上昇し、これに
よりフリーボート部に凝縮して折角分離されたスカム状
の不純物等が多量にスラグに混入してこれを汚染するか
らである。本発明は、前述炭素のピックアップの問題が
なく、取扱い溶湯の材質や精錬レベルの変化、小容量炉
での精錬、高レベルの精錬等の場合にも柔軟に対応でき
る溶湯の精錬方法およびその装置を提供することを目的
とする。That is, when the slag-forming agent is added without renewing the container, the liquid level of the slag rises, whereby a large amount of scum-like impurities and the like that are condensed in the free boat section and are separated from each other. This is because it mixes with and contaminates it. The present invention does not have the problem of carbon pickup described above, and is capable of flexibly responding to changes in the material and refining level of the molten metal handled, refining in a small capacity furnace, high-level refining, and the like, and an apparatus therefor. The purpose is to provide.
【０００８】[0008]
【課題を解決するための手段】本願の第１発明は、前述
の予備精錬が溶湯の温度低下により、精錬不能となる事
態があることを見出したことから、加熱手段を有する容
器により真空または低酸素分圧雰囲気中で精錬すること
により、所定のレベルの予備精錬を達成し、その際、溶
湯から一旦分離されてはいるが、いまだその容器内に止
り、スカム状、ドロス状等として存在する不純物の混入
は、ある程度やむを得ないものとして、そのままの容器
中で、または傾注その他の出湯法で溶湯を特に残留させ
ることなく排出（容器更新）し、造滓剤を添加してこの
溶湯中に混入した各不純物を再精錬により、効率的に除
去し、またはさらに高レベルに精錬する精錬方法であ
る。In the first invention of the present application, it has been found that there is a situation in which the above-mentioned preliminary refining becomes impossible due to the temperature decrease of the molten metal. By performing refining in an oxygen partial pressure atmosphere, a predetermined level of pre-refining was achieved, at which time it was once separated from the molten metal, but still remained in the container and remained in the form of scum, dross, etc. It is unavoidable that impurities are mixed in to some extent, and the molten metal is discharged in the container as it is or by a pouring method or other tapping method without leaving any residue (renewal of the container), and a slag forming agent is added to mix in the molten metal. It is a refining method for efficiently removing each of the above impurities by refining or refining to a higher level.
【０００９】また、本願の第２発明は、本発明が造滓剤
を添加して再精錬するものであるから、前記のように容
器を更新しない場合、この添加によりスラグ液面が上昇
し、フリーボード部にスカム状として折角分離された不
純物がスラグを汚染してしまうことを見出したことに基
づくものである。このため、第２発明は、真空または低
酸素分圧下で精錬された溶湯を容器を更新して第１発明
と同様に再精錬するものである。すなわち、本願の第１
発明は、溶湯を加熱手段を有する容器中で真空または低
酸素分圧雰囲気で予備精錬した後、該溶湯に造滓剤を添
加し、不活性ガスプラズマにより加熱して再精錬するこ
とを特徴とする溶湯の精錬方法、ならびに第２発明は、
真空または低酸素分圧雰囲気中に置かれた容器中の溶湯
を前記雰囲気中で予備精錬した後、前記溶湯を前記容器
とは別容器に移すとともに造滓剤を添加し、不活性ガス
プラズマにより加熱して再精錬することを特徴とする溶
湯の精錬方法である。The second invention of the present application is to re-refining by adding a slag forming agent according to the present invention. Therefore, if the container is not renewed as described above, the addition raises the slag liquid level, This is based on the finding that impurities separated into scum on the freeboard part contaminate the slag. Therefore, in the second invention, the molten metal refined under vacuum or low oxygen partial pressure is rerefined in the same manner as in the first invention by updating the container. That is, the first of the present application
The invention is characterized in that after the molten metal is pre-refined in a container having a heating means in a vacuum or a low oxygen partial pressure atmosphere, a slag-forming agent is added to the molten metal and heated by an inert gas plasma for re-refining. A method for refining molten metal and a second invention,
After pre-refining the molten metal in a container placed in a vacuum or low oxygen partial pressure atmosphere in the atmosphere, transfer the molten metal to a container separate from the container and add a slag-making agent, by an inert gas plasma It is a method of refining a molten metal which comprises heating and re-refining.
【００１０】第１、第２発明において、予備精錬として
誘導加熱方法によるものが望ましい。また、第２発明に
おいて、更新容器はその内面を十分に加熱しておくこと
が望ましく、この場合特に不活性ガスプラズマ加熱法に
より、例えば600℃またはそれ以上の温度に予熱してお
くのがよい。また、更新容器は予備精錬でのスプラッシ
ュやヒューム等による汚染を受けないように準備すると
よい。また、本願の精錬方法および装置において、再精
錬は、ポーラスプラグ、その他の方法によるガス吹込み
法や誘導法等による撹拌条件下で行なうことが望まし
く、また再精錬容器からの出湯は、容器底に設けたスラ
イディングノズル方式によるものが傾注法やストッパ形
式のものによるそれぞれスラグの混入やプラズマ加熱に
よるストッパの損傷等の不都合がなく適当である。In the first and second inventions, it is desirable that the pre-refining is performed by an induction heating method. Further, in the second invention, it is desirable that the inner surface of the renewal container is sufficiently heated, and in this case, it is particularly preferable to preheat it to a temperature of, for example, 600 ° C. or higher by an inert gas plasma heating method. . Further, the renewal container should be prepared so as not to be contaminated by splash, fume, etc. in the pre-refining. Further, in the refining method and apparatus of the present application, re-refining is preferably carried out under stirring conditions such as a gas injection method or induction method using a porous plug or other method. The sliding nozzle method provided in the above is suitable because there is no inconvenience such as slant mixing method or stopper type method, such as mixing of slag and damage of stopper due to plasma heating.
【００１１】次に、本発明の精錬装置は、溶湯の予備精
錬用の真空誘導加熱精錬炉と不活性ガスプラズマ加熱装
置を有する再精錬装置とで構成した、溶湯を予備精錬し
た後、さらに再精錬するための精錬装置である。すなわ
ち、本願の精錬装置は、溶湯を予備精錬した後、さらに
再精錬するための精錬装置であって、真空誘導加熱によ
る予備精錬炉、および不活性ガスプラズマ加熱装置と副
原料投入装置とを備えた再精錬炉からなり、これら両炉
を近接して配置したことを特徴とする溶湯の精錬装置で
ある。なお、本発明において、副原料とは、造滓剤や添
加元素成分を含むものである。本願の精錬装置におい
て、予備精錬装置は、その容器全体を大気遮断室内に設
けたものとすること、再精錬装置は大気遮断室内に設け
ること（特に予備精錬装置のものとは別の大気遮断室内
に設けるとよい）、等が望ましい。Next, the refining apparatus of the present invention comprises a vacuum induction heating refining furnace for pre-refining the molten metal and a re-refining apparatus having an inert gas plasma heating apparatus. A refining device for refining. That is, the refining apparatus of the present application is a refining apparatus for pre-refining a molten metal and further refining it, and includes a pre-refining furnace by vacuum induction heating, and an inert gas plasma heating device and an auxiliary raw material charging device. It consists of a re-refining furnace, and the two furnaces are arranged close to each other. In the present invention, the auxiliary raw material contains a slag forming agent and an additive element component. In the refining apparatus of the present application, the pre-refining apparatus shall be provided with the entire container in an atmosphere shut-off chamber, and the re-refining apparatus should be provided in an atmosphere shut-off chamber (in particular, an atmosphere shut-off chamber different from that of the pre-refining apparatus). It is preferable to provide the above), etc.
【００１２】[0012]
【作用】本願の第１発明の精錬方法において予備精錬
は、加熱手段を有する容器中で行なわれるから、前述の
ように、多岐に亘る材質や要求精錬レベルに対しても、
比較少量の溶湯に対しても、要すれば加熱手段を用いる
ことにより、溶湯の温度低下が防止され、これにより柔
軟に対応して所定の精錬レベルの溶湯を得ることができ
る。もちろん、冷材によるスタートアップも可能であ
る。また、第２発明の精錬方法において、再精錬は、更
新されて望ましくは新鮮な容器中で行なわれるから、造
滓剤の添加によるスラグレベルの上昇によってもスカム
状不純物によるスラグの汚染はなく、高レベルに精錬さ
れた溶湯が容易に得られる。In the refining method of the first invention of the present application, the pre-refining is carried out in a container having a heating means. Therefore, as described above, even for various materials and required refining levels,
Even if a small amount of molten metal is used, the temperature of the molten metal can be prevented from lowering by using a heating means if necessary, so that the molten metal having a predetermined refining level can be flexibly obtained. Of course, it is possible to start up with cold materials. Further, in the refining method of the second invention, the re-refining is performed in a fresh container, preferably a fresh container, so that even if the slag level is increased by adding the slag-forming agent, the slag is not contaminated with scum-like impurities, Highly refined molten metal can be easily obtained.
【００１３】本願の方法発明における再精錬は、予備精
錬段階で一旦分離された不純物が溶湯中へ溶解してしま
う以前に不活性ガスプラズマ加熱により活性化させたス
ラグにより効果的に吸収させることにより行なわれる。
すなわち、本発明において、スラグは不活性ガスプラズ
マ加熱により十分加熱されて低粘性かつ活性化されるこ
とにより、前記付着物、浮遊物等の再混入物質および耐
火物に起因する汚染物質を効果的に捕集することがで
き、望ましくは後述の不活性ガス吹込み等による十分な
撹拌により、溶湯と十分に相互に交換しつつ接触し、高
い精錬効果を生ずる。The re-refining in the method invention of the present application is carried out by effectively absorbing the impurities once separated in the preliminary refining stage by the slag activated by the inert gas plasma heating before being dissolved in the molten metal. Done.
That is, in the present invention, the slag is sufficiently heated by the inert gas plasma heating to have a low viscosity and is activated, so that the adhering substances, the re-mixed substances such as suspended matters and the contaminants caused by the refractory are effectively treated. It is possible to collect in a molten metal, and it is desirable that the molten metal comes into contact with the molten metal while being sufficiently exchanged with each other by sufficient agitation such as blowing of an inert gas, which will be described later, to produce a high refining effect.
【００１４】また、不活性ガスプラズマ加熱法は、上述
のようにスラグを効果的に加熱する一方、溶湯やスラグ
の表面を被覆して溶湯の酸化やスラグが酸化性となるこ
とを防ぎつつ、溶湯を昇温し、または温度低下を補償
し、かつ、黒鉛電極アーク加熱法のごとく、炭素のピッ
クアップ等の再汚染の危険がない。なお、本発明方法で
は、後述の実施例のように予備精錬以上の高レベルにま
で精錬を行なうものも含む。なお、本発明の精錬方法に
おいて、再精錬は受湯後可能の限り早期に開始すること
が肝要である。すなわち、前記の付着物および浮遊物等
の汚染物質は、時間の経過と共に溶湯内に均一に溶解し
ていくから、効果的精錬は、これらが溶解してしまう以
前に行なうことにより、達成されるからである。Further, the inert gas plasma heating method effectively heats the slag as described above, while coating the surface of the molten metal or slag to prevent oxidation of the molten metal or oxidization of the slag, There is no risk of re-contamination such as carbon pick-up, as in the graphite electrode arc heating method, in which the temperature of the molten metal is raised or the temperature drop is compensated. The method of the present invention includes a method of refining to a higher level than the pre-refining as in Examples described later. In the refining method of the present invention, it is important to start re-refining as soon as possible after receiving the hot water. That is, since the contaminants such as the above-mentioned deposits and suspended matters are uniformly dissolved in the molten metal with the passage of time, effective refining is achieved by performing them before they are dissolved. Because.
【００１５】本発明の精錬方法における望ましい態様で
ある撹拌の方法は、炉底に設けたポーラスプラグからの
不活性ガスによるものが、撹拌効果の点から望ましい。
また、電磁撹拌装置を単独または併用して用いてもよ
い。不活性ガスプラズマ加熱装置は、前述のようにバー
ナのごとく、ＣＯ2、Ｈ2Ｏ、遊離Ｏ2等の酸化性ガスを
発生せず、かつ高温加熱に適すから、本発明において再
精錬に用いることはもちろん、容器を更新する場合は予
備精錬継続中に、他方でこの加熱装置（形式にもよる
が）を用いて再精錬容器を高清浄かつ高温に予熱するの
に用いることが望ましい。この加熱装置を用いれば、再
精錬容器を1200℃以上に予熱することは十分可能で、こ
れにより吸着ガスの離脱、溶湯の冷却防止を図ることが
できる。As a stirring method which is a preferable mode in the refining method of the present invention, an inert gas from a porous plug provided in the furnace bottom is preferable from the viewpoint of stirring effect.
Moreover, you may use an electromagnetic stirring device individually or in combination. As described above, the inert gas plasma heating device does not generate an oxidizing gas such as CO 2 , H 2 O, and free O 2 like the burner, and is suitable for high temperature heating. Therefore, the inert gas plasma heating device is used for re-refining in the present invention. Of course, it is desirable to use this heating device (depending on the type) to preheat the re-refining vessel to a highly clean and high temperature while continuing the pre-refining when renewing the vessel. If this heating device is used, it is possible to preheat the re-refining vessel to 1200 ° C. or higher, thereby preventing desorption of adsorbed gas and cooling of the molten metal.
【００１６】本発明の精錬装置は、前記方法発明を実施
する具体的装置であり、真空または低酸素分圧下の予備
精錬用の炉として、特に誘導加熱精錬炉を用い、この炉
と再精錬炉を近接して設けたものである。誘導加熱精錬
炉は、加炭作用がなく、また溶解原料を要すれば溶解
し、比較的低い不純物値まで高能率かつ低コストで精錬
することが可能である。本発明装置において、誘導加熱
精錬炉はその加熱能力により、溶湯の温度低下を防止し
て本願の第１発明の目的の達成を可能とする。両炉を近
接して設けたことにより、予備精錬を完了された溶湯
は、速やかに再精錬を開始されることができ、前述の効
果的精錬を達成することができ、また、高温に予熱した
更新容器は過度に冷却することなく、速やかに受湯する
ことができる。The refining apparatus of the present invention is a specific apparatus for carrying out the above method invention. As a furnace for pre-refining under vacuum or low oxygen partial pressure, an induction heating refining furnace is used, and this refining furnace and re-refining furnace are used. Are provided close to each other. The induction heating refining furnace does not have a carburizing action, and if it needs a melting raw material, it can be melted and refined to a relatively low impurity value with high efficiency and low cost. In the apparatus of the present invention, the heating capacity of the induction heating refining furnace prevents the temperature of the molten metal from decreasing and enables the object of the first invention of the present application to be achieved. By providing both furnaces in close proximity to each other, the molten metal that has been pre-refined can be promptly started to be re-refined, the above-mentioned effective refining can be achieved, and pre-heated to a high temperature. The renewal container can receive hot water promptly without excessive cooling.
【００１７】本発明の精錬炉の好ましい実施態様とし
て、再精錬は更新容器内で専用の大気遮断室内で行なう
ようにし、この遮断室と、誘導加熱精錬炉用の大気遮断
室とを隣接または一体的に、各々の室間をバルブ等で開
閉可能にして設け、このバルブの開口を通して更新容器
を移動して誘導加熱精錬炉から受湯できるようにすると
よい。In a preferred embodiment of the refining furnace of the present invention, re-refining is carried out in a special atmosphere shut-off chamber in the renewal vessel, and this shut-off chamber is adjacent to or integrated with the atmospheric shut-off chamber for the induction heating refining furnace. Specifically, it is advisable to provide a valve or the like between the chambers so that the chamber can be opened and closed, and the renewal container can be moved through the opening of the valve to receive hot water from the induction heating and refining furnace.
【００１８】こうすると、再精錬側の大気遮断室を空気
排除状態に保つことにより、再精錬容器の予備精錬室へ
の出入に際し、予備精錬室が空気で汚染されることが防
止され、また、再精錬は不活性ガス雰囲気中で行なうこ
とが可能となり、さらに両室を、遮断可能としたこと
で、例えば一方で一次精錬、他方で内張り耐火物の予熱
と、それぞれ独立に互いに干渉することなく、かつ、再
精錬容器は予備精錬によるスプラッシュやヒュームから
独立に保持することが可能である。上記実施態様の精錬
装置においては、真空または低酸素分圧下精錬後の溶湯
を、傾注により出湯形式とすると、該精錬炉が単純化さ
れるので望ましい。By so doing, by keeping the atmosphere shut-off chamber on the re-refining side in an air-excluded state, it is possible to prevent the pre-refining chamber from being contaminated with air when the re-refining container enters or leaves the pre-refining chamber. Re-refining can be performed in an inert gas atmosphere, and by making both chambers shut off, for example, primary refining on the one hand, preheating of the refractory lining on the other hand, without independently interfering with each other. And, the re-refining vessel can be held independently from the splash and fume from the pre-refining. In the refining apparatus of the above-described embodiment, it is desirable that the molten metal after refining under vacuum or low oxygen partial pressure is of a tapping type to simplify the refining furnace.
【００１９】[0019]
【実施例】先ず、本発明の精錬装置の代表的実施例から
説明する。図１は、本発明の精錬装置の一配置例を示す
図である。真空または低酸素分圧下精錬装置１は、側壁
に仕切りバルブ４を有する大気遮断室本体２および蓋体
３からなる大気遮断室ａ、該大気遮断室ａ内に設けられ
た誘導加熱精錬炉５、バルブを含む真空排気系６ａ、造
滓剤またはさらに合金等の副原料の投入系８（誘導加熱
精錬炉用），９（再精錬容器用）およびバルブを含む不
活性ガス導入系７ａからなっている。EXAMPLES First, representative examples of the refining apparatus of the present invention will be described. FIG. 1 is a diagram showing an arrangement example of the refining apparatus of the present invention. The refining apparatus 1 under vacuum or low oxygen partial pressure includes an atmospheric shut-off chamber a composed of an atmospheric shut-off chamber body 2 having a partition valve 4 on a side wall and a lid 3, an induction heating refining furnace 5 provided in the atmospheric shut-off chamber a, It consists of a vacuum exhaust system 6a including a valve, an injection system 8 (for an induction heating refining furnace) and 9 (for a re-refining vessel) of auxiliary materials such as a slag forming agent or an alloy, and an inert gas introduction system 7a including a valve. There is.
【００２０】再精錬装置２０は次の装置等からなる。す
なわち、前述の大気遮断室ａに隣接して設けられ、一方
端側に仕切りドア２２を有し、かつ仕切りバルブ４を介
して前記大気遮断室ａと接続されることにより、大気遮
断室ａとの間に連通と遮断が可能とされた大気遮断室
ｂ、該大気遮断室ｂの天井部に昇降可能に設けられた不
活性ガスプラズマ加熱装置２３、前記誘導加熱精錬炉５
の傾注による受湯位置（２７′で示す）と、前記不活性
ガスプラズマ加熱装置２３の直下部での再精錬位置（２
７で示す）間を、前記バルブ４の開口を経て、軌条およ
び台車２４により移動可能とされ、容器底にポーラスプ
ラグ２８とスライディングノズル２９を有する再精錬容
器２７、バルブを含む排気系６ｂ、バルブを含む不活性
ガス供給系７ｂ、鋳造用インゴットケース３０とその台
車３１からなっている。The rerefining device 20 comprises the following devices. That is, by being provided adjacent to the atmosphere shut-off chamber a, having the partition door 22 on one end side, and being connected to the atmosphere shut-off chamber a via the partition valve 4, the atmosphere shut-off chamber a is Atmosphere shut-off chamber b capable of communication and shut-off between them, an inert gas plasma heating device 23 provided on the ceiling of the atmospheric shut-off chamber b so as to be able to move up and down, the induction heating and refining furnace 5
Hot water receiving position (shown by 27 ') and a refining position (2) just below the inert gas plasma heating device 23.
7), a re-refining vessel 27 having a porous plug 28 and a sliding nozzle 29 at the bottom of the vessel, which is movable by a rail and a carriage 24 through the opening of the valve 4, an exhaust system 6b including the valve, and a valve. And an ingot case 30 for casting and a carriage 31 for the same.
【００２１】図１に示す設備において、以下に示す手順
で操業を行なう。誘導加熱精錬炉５に、蓋体３を除去し
た状態で固体原料またはアーク炉等で溶解し、一次精錬
された溶湯を取鍋により供給する。続いて、蓋体３を施
し、真空排気系６ａにより大気遮断室ａ内を真空とし、
またはさらに所定ガスを供給して不活性雰囲気とした
後、誘導加熱炉により精錬を開始する。すなわち、大気
遮断室ａにおいて誘導加熱精錬炉５により、1Torr以下
の真空または200Torr以下程度の不活性ガス等の雰囲気
において所要温度に保持しつつ所要時間溶湯の予備精錬
を行なう。この予備精錬は、誘導加熱の加熱能力によ
り、精錬温度、時間はほぼ自由に選定できるから、確実
に所定精錬レベルの溶湯を得ることができる。The equipment shown in FIG. 1 is operated in the following procedure. In the induction heating and refining furnace 5, a molten metal which is melted in a solid raw material or an arc furnace in a state where the lid 3 is removed and is then primary refined is supplied by a ladle. Subsequently, the lid 3 is applied, and the inside of the atmosphere blocking chamber a is evacuated by the vacuum exhaust system 6a,
Alternatively, after further supplying a predetermined gas to make an inert atmosphere, refining is started in an induction heating furnace. That is, the induction heating and refining furnace 5 in the air shut-off chamber a performs preliminary refining of the molten metal for a required time while maintaining the required temperature in a vacuum of 1 Torr or less or an atmosphere of an inert gas or the like of about 200 Torr or less. In this preliminary refining, the refining temperature and time can be selected almost freely depending on the heating capacity of induction heating, so that the molten metal of a predetermined refining level can be reliably obtained.
【００２２】並行的に大気遮断室ｂにおいては、予め外
部で予熱された再精錬容器をセットする。場合により大
気圧付近の不活性ガス雰囲気において、不活性ガスプラ
ズマ加熱装置２３を用いて再精錬容器５の内張り耐火物
を溶湯のない状態で加熱し、例えば、出湯温度と同程度
またはそれ以上等適当な温度に加熱することにより、耐
火物を、空気や燃焼生成ガス等によるごとき汚染のない
状態で不動態化し、溶湯を受湯した場合の溶湯の汚染
と、温度低下を最少にするべく加熱待機する。大気遮断
室ａでの精錬が完了すると、大気遮断室ｂの不活性ガス
プラズマ加熱装置２３の運転を停止すると同時に大気遮
断室ｂを真空排気系６ｂで排気することにより、両室を
同圧力として仕切バルブ４を開放し、その開口を経て再
精錬容器２７を軌条および台車２４により大気遮断室ａ
の位置２７′へ移動する。In parallel with this, in the atmosphere shut-off chamber b, a re-refining vessel preheated outside beforehand is set. In some cases, the refractory lining of the re-refining vessel 5 is heated in the inert gas atmosphere near atmospheric pressure using the inert gas plasma heating device 23 in a state without molten metal, for example, at the same or higher temperature as the tapping temperature. By heating to an appropriate temperature, the refractory is passivated without contamination such as air or combustion produced gas, and it is heated to minimize the contamination of the molten metal when receiving the molten metal and the temperature decrease. stand by. When the refining in the air shut-off chamber a is completed, the operation of the inert gas plasma heating device 23 in the air shut-off chamber b is stopped, and at the same time, the air shut-off chamber b is evacuated by the vacuum exhaust system 6b so that both chambers have the same pressure. The partition valve 4 is opened, and the re-refining vessel 27 is opened through the opening by the rail and the carriage 24 to the atmosphere shut-off chamber a.
Position 27 '.
【００２３】誘導加熱精錬炉５を傾動する等により、溶
湯を再精錬容器２７へ出湯する(容器更新)。出湯後副原
料投入系９により造滓剤、必要によってはさらに合金原
料を添加する(容器が更新されているので、この造滓材
の添加によってもスカム等によるスラグの汚染はな
い)。その後、軌条および台車２４により、溶湯を保持
した再精錬容器を速やかに再精錬位置（２７）へ移動
し、不活性ガスプラズマ加熱装置により加熱して造滓剤
の溶融、加熱を行ない、かつ不活性ガス導入系７ｂを経
てポーラスプラグ２８からガス吹込み撹拌することによ
り、傾動等による出湯により再精錬容器２７内に溶湯と
共に流れ込んだドロス状、スカム状浮遊物や付着物、ま
たはさらに自身の耐火物に起因する汚染物が溶湯内に溶
融拡散する以前に新鮮で活性なスラグで吸収する。この
ことが最大の再精錬効果を生むこととなる。場合によっ
ては、予備精錬レベル以上のレベルに精錬する。再精錬
が終了し、所定の鎮静を行なった後、スライディングノ
ズル２９を経てインゴットケース３０に鋳造する。By inclining the induction heating refining furnace 5 or the like, the molten metal is discharged to the re-refining vessel 27 (container renewal). After tapping, a slag-forming agent and, if necessary, an alloy raw material are further added by the auxiliary raw material charging system 9 (since the container is renewed, the addition of this slag-making material does not contaminate the slag with scum or the like). After that, the rail and the carriage 24 quickly move the re-refining container holding the molten metal to the re-refining position (27) and heat it with an inert gas plasma heating device to melt and heat the slag-making agent, and By blowing gas from the porous plug 28 through the active gas introduction system 7b and stirring, the dross-like or scum-like suspended matter or adhering matter that has flowed into the re-refining vessel 27 together with the molten metal due to tilting or other hot water, or even its own fire resistance. Material-borne contaminants are absorbed by fresh, active slag before they melt and diffuse into the melt. This produces the maximum refining effect. In some cases, refine to a level higher than the preliminary refining level. After the re-refining is completed and a predetermined sedation is carried out, it is cast into the ingot case 30 through the sliding nozzle 29.
【００２４】インゴットケース３０内への溶湯の鋳込み
を能率化するために、大気遮断室ｂ内には、インゴット
ケース３０をセットできるよう鋳造台車３１を設けるこ
とが望ましく、また、仕切ドア２２を設けて水平方向に
搬入搬出可能とすることが望ましい。なお、この再精錬
を完了した溶湯は再精錬容器２７を天井クレーンなどで
運搬し、大気中で鋳造した場合でも同様に良好な結果が
得られる。次に本願の方法発明の効果を各種のテスト例
で説明する。いずれも、実験に用いた溶湯は、ばね用高
級炭素鋼および高Ｎｉステンレス鋼であり、以下の各図
において、○印は、溶湯中Ｏ2ガス濃度、×印は同Ｎ2濃
度を表し、また破線は前記高Ｎｉステンレス鋼、実線は
ばね用高級炭素鋼を表す。In order to efficiently cast the molten metal into the ingot case 30, it is desirable to provide a casting carriage 31 in the atmosphere blocking chamber b so that the ingot case 30 can be set therein, and a partition door 22 is provided. It is desirable to be able to carry in and out horizontally. The molten metal which has been subjected to this re-refining can similarly obtain good results even when the re-refining container 27 is transported by an overhead crane or the like and cast in the atmosphere. Next, the effects of the method invention of the present application will be described with various test examples. In each case, the molten metal used in the experiment was a high-grade carbon steel for springs and a high Ni stainless steel, and in each of the following figures, the O mark represents the O 2 gas concentration in the molten metal, and the X mark represents the same N 2 concentration. The broken line represents the high Ni stainless steel, and the solid line represents the high-grade carbon steel for springs.
【００２５】図２は、アーク炉で１次精錬した後、真空
誘導加熱精錬炉に受湯して引続き本発明の予備精錬をし
た時の経過時間に対する精錬の進行度合を、鋼中のＯ2
およびＮ2ガス濃度で測定した結果を示した図である。
図２から、真空精錬により経過時間とともに、精錬が急
速に進行していることがわかる。図３は、上記により予
備精錬（６０分間）した溶湯を傾注により、内張り耐火
物を加熱して準備した再精錬容器に受湯し、そのまま６
０分間放置した時の、ガス濃度の測定結果を示したもの
である。これによると、受湯直後のガス濃度は、本精錬
完了時点のそれとほぼ同様であるが、放置時間の経過と
ともにガス濃度が増加している。この増加は、傾注に伴
って発生した不純物の溶湯への再混入に起因するものと
推定される。[0025] Figure 2, after the primary refining in an arc furnace, the progress of refining with respect to the elapsed time when the pre-refining continues present invention to受湯the vacuum induction heating refining furnace, O 2 in the steel
And is a graph showing the results of measurement by the N 2 gas concentration.
From FIG. 2, it can be seen that the refining progresses rapidly with the elapse of time due to the vacuum refining. FIG. 3 shows that the molten metal that has been pre-refined (60 minutes) as described above is poured into the re-refining container prepared by heating the refractory lining, and the molten refining container
It shows the measurement result of the gas concentration when left for 0 minutes. According to this, the gas concentration immediately after receiving the hot water is almost the same as that at the time of completion of the refining, but the gas concentration increases with the passage of standing time. It is presumed that this increase is due to the re-mixing of impurities generated by the injection into the molten metal.
【００２６】図４は、前記予備精錬と同一条件で精錬し
た溶湯を予め不活性ガスプラズマ加熱装置で内張り耐火
物を加熱した再精錬容器へ上述と同一条件の傾注により
受湯し、造滓剤を添加すると共に、炉底のポーラスプラ
グによるアルゴンガス撹拌と溶湯上面からの不活性ガス
プラズマ加熱を行ないつつ、本発明における再精錬を行
なった時のガス濃度の変化を示すものである。この図か
ら、本発明に係る再精錬で再混入物の再溶解は防止さ
れ、時間の経過とともに、ガス濃度はむしろ徐々に低下
しており、予備精錬のレベル以上に精錬が進行している
ことがわかる。なお、本発明における再精錬時間は３０
〜６０分間程度で十分である。FIG. 4 shows that the molten metal refined under the same conditions as in the preliminary refining is poured into a re-refining container in which a refractory lining has been heated in advance by an inert gas plasma heating apparatus by decanting under the same conditions as described above, and a slag forming agent. Fig. 3 shows a change in gas concentration when re-refining is performed in the present invention while adding argon, stirring argon gas with a porous plug at the bottom of the furnace, and heating an inert gas plasma from the upper surface of the molten metal. From this figure, re-melting of the re-mixture was prevented by the re-refining according to the present invention, the gas concentration rather decreased gradually with the passage of time, and the refining progressed above the level of the pre-refining. I understand. The re-refining time in the present invention is 30
About 60 minutes is sufficient.
【００２７】図５は、鋳造に先立って行なう鎮静処理の
影響を見るために、前記本発明の再精錬に引き続いて、
図３で述べたのと同一条件で再精錬容器中でそのまま鎮
静保持した時の、鎮静保持時間と溶湯中のガス濃度との
関係を示したものである。これによると、本発明におけ
る６０分間の再精錬後の溶湯は、６０分間の鎮静におい
ても溶湯中のガス濃度の上昇は、図３に比較し非常に低
く、かつ絶対値レベルも低い。したがって、再精錬状態
のままの清浄度を有するインゴットを得ることができる
ことがわかる。同様にして、再精錬時間を３０分間と
し、その後同様に鎮静した実験でも上記とほぼ同様の結
果が得られた。FIG. 5 shows the effect of the soothing treatment performed prior to casting, following the refining of the present invention, as follows.
4 shows the relationship between the sedative holding time and the gas concentration in the molten metal when the sedative holding is carried out in the re-refining vessel under the same conditions as described in FIG. According to this, in the molten metal after re-refining for 60 minutes in the present invention, the increase in the gas concentration in the molten metal even in the sedation for 60 minutes is very low as compared with FIG. 3, and the absolute value level is also low. Therefore, it can be seen that it is possible to obtain an ingot having the cleanliness in the re-refined state. Similarly, in the experiment in which the refining time was set to 30 minutes and then the sedation was performed in the same manner, almost the same result as above was obtained.
【００２８】次に図６は、アーク炉で予備精錬した溶湯
（図２で述べた実験に用いたものとほぼ同様）を真空精
錬することなく、直接本発明における再精錬容器に受湯
し、図４で述べた前述の実験と同条件（スラグ存在下、
ガス吹込み撹拌、不活性ガスプラズマ加熱、以下不活性
ガスプラズマ精錬と記す）で精錬した時の溶湯中ガス濃
度を精錬時間の経過と共に測定した結果を示すものであ
る。これによると、不活性ガスプラズマ精錬法は、かな
り高い精錬作用を有するが、精錬速度的には真空精錬法
にははるかに及ばず、したがって低精錬レベル範囲まで
は、真空精錬法を用い、その後傾注等に伴う再混入分程
度を不活性ガスプラズマ精錬法で再精錬することの有利
性が理解できる。Next, FIG. 6 shows that the molten metal preliminarily refined in an arc furnace (almost the same as that used in the experiment described in FIG. 2) is directly subjected to the refining vessel of the present invention without vacuum refining, The same conditions as the above-mentioned experiment described in FIG. 4 (in the presence of slag,
It shows the result of measuring the gas concentration in the molten metal with refining time when refining by gas blowing stirring, inert gas plasma heating, and hereinafter referred to as inert gas plasma refining). According to this, the inert gas plasma refining method has a considerably high refining action, but the refining rate is far lower than the vacuum refining method, and therefore, up to a low refining level range, the vacuum refining method is used, It is possible to understand the advantage of re-refining the re-mixed amount due to decanting by the inert gas plasma refining method.
【００２９】なお、以上の実施例において、予備精錬の
例として真空精錬法を用いた例で述べたが、本発明はこ
れに限定されない。すなわち、精錬対象である溶湯が含
有する合金成分元素によっては、その成分の蒸発等によ
る損失を防止抑制するため、通常、絶対圧力で200Torr
程度以下の不活性ガス雰囲気が適宜選定されており、こ
の精錬法に関しては、本発明も例外ではないからであ
る。また、上記実施例において、真空精錬用溶湯は、他
の溶解炉で溶解および一次精錬したものを用いたが、本
発明はこれにも限定されず、冷原料を用いて、溶解と予
備精錬をするものであってもよい。Although the vacuum refining method is used as an example of the pre-refining in the above embodiments, the present invention is not limited to this. In other words, depending on the alloy component elements contained in the molten metal that is the object of refining, in order to prevent loss due to evaporation of the components, it is usually 200 Torr at absolute pressure.
This is because an inert gas atmosphere of a certain degree or less is appropriately selected, and the present invention is no exception to this refining method. Further, in the above-mentioned examples, the molten metal for vacuum refining was used by melting and primary refining in another melting furnace, but the present invention is not limited to this, and using a cold raw material, melting and pre-refining It may be one that does.
【００３０】[0030]
【発明の効果】以上述べたように、本願の第１の方法発
明は、加熱手段を有する精錬炉を用いることにより材質
や要求、精錬レベルの広い範囲に亘り、真空または200T
orr程度以下等のの不活性ガス雰囲気を含む低酸素分圧
下の予備精錬法で、先ず能率的に比較的高い所要のレベ
ルまで確実に精錬した後連続して、炉体壁付着物や浮遊
物等の再混入物質を、それが溶湯全体に均一に溶解しな
いうちに効果的に不活性ガスプラズマ加熱しつつ、スラ
グ存在下で精錬することにより精錬除去可能とするもの
である。As described above, according to the first method invention of the present application, by using a refining furnace having heating means, a vacuum or 200T can be used over a wide range of materials, requirements and refining levels.
Preliminary refining method under a low oxygen partial pressure containing an inert gas atmosphere such as orr level or less.First, the refractory wall deposits and suspended matter are continuously refined to a required level that is relatively high and efficient. It is possible to refine and remove re-mixed substances such as, for example, by refining in the presence of slag while effectively heating with an inert gas plasma before it is uniformly dissolved in the entire melt.
【００３１】また、第２の方法発明は、容器を更新する
ことで、造滓剤の添加によるスラグの汚染を防止して第
１発明と同様の不活性ガスプラズマによる再精錬に移行
するものである。これにより、材質や要求精錬レベル、
さらには炉容量の限定を受けず、柔軟に対応して高度に
精錬された溶湯が得られ、健全なインゴット、鋳造品を
得ることを可能とするものである。また、本願の装置発
明は、方法の発明の予備精錬を誘導加熱炉として、これ
を不活性ガスプラズマ再精錬炉を近接して設けたので、
予備精錬後、短時間内に再精錬を開始することができ、
本願の方法発明を効果的に実施することを可能となる。In the second method invention, by renewing the container, the slag is prevented from being contaminated due to the addition of the slag-making agent, and the refining by the inert gas plasma similar to the first invention is performed. is there. As a result, the material and required refining level,
Furthermore, it is possible to obtain a highly refined molten metal that is flexible and can obtain a sound ingot and a cast product without being limited by the furnace capacity. Further, the apparatus invention of the present application uses the preliminary refining of the method invention as an induction heating furnace, and the inert gas plasma rerefining furnace is provided in the vicinity of the induction heating furnace.
After preliminary refining, you can start re-refining within a short time,
It becomes possible to effectively carry out the method invention of the present application.
【図１】本願の装置発明の一配置例を示す図である。FIG. 1 is a diagram showing an arrangement example of a device invention of the present application.
【図２】アーク炉で予備精錬した溶湯を真空誘導炉で本
精錬した時の、精錬経過時間に対する精錬の進行度合を
鋼中のＯ2およびＮ2ガス濃度で示した図である。FIG. 2 is a diagram showing the progress of refining with respect to elapsed refining time in terms of O 2 and N 2 gas concentrations in steel when a molten metal preliminarily refined in an arc furnace is main refined in a vacuum induction furnace.
【図３】上記本精錬（図２）後、炉体の傾注により受湯
し、放置した時の再汚染状況を示す図である。FIG. 3 is a diagram showing a state of recontamination when the molten metal is received by tilting the furnace body and left as it is after the main refining (FIG. 2).
【図４】上記本精錬（図２）後、本発明の再精錬を行な
った時の溶湯中ガス濃度を示す図である。FIG. 4 is a diagram showing a gas concentration in a molten metal when the re-refining of the present invention is performed after the main refining (FIG. 2).
【図５】上記本発明の再精錬（図４）後、そのまま鎮静
し、その経過時間と溶湯中ガス濃度との関係を示す図で
ある。FIG. 5 is a diagram showing the relationship between the elapsed time and the gas concentration in the molten metal after the above refining (FIG. 4) of the present invention was calmed down.
【図６】アーク炉で予備精錬した溶湯を本発明における
再精錬と同条件で精錬した時の精錬時間と溶湯中ガス濃
度との関係を示す図である。FIG. 6 is a diagram showing a relationship between a refining time and a gas concentration in a molten metal when the molten metal preliminarily refined in an arc furnace is refined under the same conditions as the re-refining in the present invention.
１ 真空または低酸素分圧下精錬装置、２ 大気遮断室
本体、３ 蓋体、４仕切りバルブ、５ 誘導加熱精錬
炉、６ａ 真空排気系、６ｂ 真空排気系、７ａ 不活
性ガス導入系、７ｂ 不活性ガス導入系、８ 副原料投
入系、９ 副原料投入系、２０ 再精錬装置、２２ 仕
切りドア、２３ 不活性ガスプラズマ加熱装置、２４
軌条および台車、２７ 再精錬容器（再精錬位置）、２
８ ポーラスプラグ、２９ スライディングノズル、３
０ インゴットケース、３１ 台車、ａ 大気遮断室、
ｂ 大気遮断室1 vacuum or low oxygen partial pressure refining equipment, 2 atmosphere blocking chamber body, 3 lid, 4 partition valve, 5 induction heating refining furnace, 6a vacuum exhaust system, 6b vacuum exhaust system, 7a inert gas introduction system, 7b inert Gas introduction system, 8 auxiliary raw material charging system, 9 auxiliary raw material charging system, 20 re-refining device, 22 partition door, 23 inert gas plasma heating device, 24
Rails and carts, 27 re-refining vessels (re-refining position), 2
8 porous plugs, 29 sliding nozzles, 3
0 ingot case, 31 dolly, a atmosphere shut-off chamber,
b Atmosphere shutoff chamber
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鈴木 充 島根県安来市安来町2107番地の２ 日立金 属株式会社安来工場内 (72)発明者 金元 克己 島根県安来市安来町2107番地の２ 日立金 属株式会社安来工場内 (72)発明者 向井 孝 島根県安来市安来町2107番地の２ 日立金 属株式会社安来工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Suzuki 2-2, Yasugi-cho, Yasugi-shi, Shimane 2 Inside the Yasugi factory, Hitachi Metals, Ltd. (72) Inventor Katsumi Kanemoto 2107-2, Yasugi-cho, Yasugi-shi, Shimane Prefecture Hitachi Metals Co., Ltd. Yasugi Plant (72) Inventor Takashi Mukai 2107-2 Yasugi Town, Yasugi City, Shimane Prefecture 2 Hitachi Metals Co., Ltd. Yasugi Plant
Claims (5)
または低酸素分圧雰囲気で予備精錬した後、該溶湯に造
滓剤を添加し、不活性ガスプラズマにより加熱して再精
錬することを特徴とする溶湯の精錬方法。1. A molten metal is pre-refined in a container having a heating means in a vacuum or low oxygen partial pressure atmosphere, and then a slag-making agent is added to the molten metal, and the molten metal is heated by an inert gas plasma for re-refining. A method for refining molten metal characterized by.
のである請求項１の溶湯の精錬方法。2. The method for refining a molten metal according to claim 1, wherein the heating means for pre-refining is induction heating.
た容器中の溶湯を前記雰囲気中で予備精錬した後、前記
溶湯を前記容器とは別容器に移すとともに造滓剤を添加
し、不活性ガスプラズマにより加熱して再精錬すること
を特徴とする溶湯の精錬方法。3. After pre-refining the molten metal in a container placed in a vacuum or low oxygen partial pressure atmosphere in the atmosphere, the molten metal is transferred to a container separate from the container and a slag forming agent is added, A method for refining a molten metal, characterized by heating and refining with an inert gas plasma.
るための精錬装置であって、真空誘導加熱による予備精
錬炉および不活性ガスプラズマ加熱装置と副原料投入装
置とを備えた再精錬炉からなり、これら両炉を近接して
配置したことを特徴とする溶湯の精錬装置。4. A refining apparatus for pre-refining a molten metal and further refining the molten metal, comprising a pre-refining furnace by vacuum induction heating, an inert gas plasma heating apparatus, and an auxiliary raw material charging apparatus. The molten metal refining equipment is characterized in that the two furnaces are arranged close to each other.
るための精錬装置であって、互いに連通と遮断が可能と
され、いずれも排気系を有する二つの大気遮断室を接近
して設け、その一方に、収容した溶湯を出湯可能にして
誘導加熱精錬炉を、他方に、不活性ガスプラズマ加熱装
置をそれぞれ設けるとともに、前記精錬炉から受湯する
位置と前記不活性ガスプラズマ加熱装置を用いて再精錬
する位置との間を移動可能にして再精錬容器を設け、さ
らに前記再精錬容器へ造滓剤を包含する副原料を供給可
能に副原料投入装置を設けたことを特徴とする請求項４
の溶湯の精錬装置。5. A refining device for pre-refining a molten metal and further refining the molten metal, which is capable of communicating and blocking each other, and is provided with two atmosphere blocking chambers close to each other, each having an exhaust system, One of them is provided with an induction heating refining furnace capable of discharging the contained molten metal, and the other is provided with an inert gas plasma heating device, and the position for receiving the hot water from the refining furnace and the inert gas plasma heating device are used. And a re-refining container is provided so as to be movable between the re-refining position and a re-refining container, and an auxiliary raw material charging device is provided to supply the auxiliary raw material containing the slag refinement agent to the re-refining container. Item 4
Smelter refining equipment.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11109894A JP3438830B2 (en) | 1993-05-26 | 1994-05-25 | Refining method and equipment for molten metal |
| US08/586,871 US5753004A (en) | 1994-05-25 | 1994-12-27 | Method for refining molten metal and apparatus for same |
| DE69428123T DE69428123T2 (en) | 1994-05-25 | 1994-12-27 | Device and method for refining a molten metal |
| EP95904004A EP0725151B1 (en) | 1994-05-25 | 1994-12-27 | Apparatus and method for refining molten metal |
| PCT/JP1994/002268 WO1995032312A1 (en) | 1994-05-25 | 1994-12-27 | Method and apparatus for refining molten metal |
| KR1019960700397A KR100191701B1 (en) | 1994-05-25 | 1994-12-27 | Method and apparatus for refining molten metal |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12383693 | 1993-05-26 | ||
| JP5-123836 | 1993-05-26 | ||
| JP11109894A JP3438830B2 (en) | 1993-05-26 | 1994-05-25 | Refining method and equipment for molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0741875A true JPH0741875A (en) | 1995-02-10 |
| JP3438830B2 JP3438830B2 (en) | 2003-08-18 |
Family
ID=26450572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11109894A Expired - Lifetime JP3438830B2 (en) | 1993-05-26 | 1994-05-25 | Refining method and equipment for molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3438830B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101015019B1 (en) * | 2007-12-07 | 2011-02-16 | 김주용 | Refinery having dual bubbling filter |
| JP2016172911A (en) * | 2015-03-18 | 2016-09-29 | 日立金属株式会社 | Casting device and casting method |
| CN111235405A (en) * | 2020-03-20 | 2020-06-05 | 四川博鑫铜业有限公司 | Low-oxygen copper rod preparation process |
-
1994
- 1994-05-25 JP JP11109894A patent/JP3438830B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101015019B1 (en) * | 2007-12-07 | 2011-02-16 | 김주용 | Refinery having dual bubbling filter |
| JP2016172911A (en) * | 2015-03-18 | 2016-09-29 | 日立金属株式会社 | Casting device and casting method |
| CN111235405A (en) * | 2020-03-20 | 2020-06-05 | 四川博鑫铜业有限公司 | Low-oxygen copper rod preparation process |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3438830B2 (en) | 2003-08-18 |
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