JP2636985B2 - Reduction method of molten copper or copper alloy - Google Patents
Reduction method of molten copper or copper alloyInfo
- Publication number
- JP2636985B2 JP2636985B2 JP19998591A JP19998591A JP2636985B2 JP 2636985 B2 JP2636985 B2 JP 2636985B2 JP 19998591 A JP19998591 A JP 19998591A JP 19998591 A JP19998591 A JP 19998591A JP 2636985 B2 JP2636985 B2 JP 2636985B2
- Authority
- JP
- Japan
- Prior art keywords
- gas
- molten metal
- copper
- molten
- copper alloy
- 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
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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)
Description
【０００１】[0001]
【産業上の利用分野】本発明は銅または銅合金溶湯の還
元法に関し、さらに詳しくは、銅および銅合金溶湯の還
元に際して、発生するＯ2ガスを溶湯中および溶湯表面
から可及的速やかに除去することが可能な銅または銅合
金溶湯の還元法に関するものである。The present invention relates to an reduction method of copper or a copper alloy melt, more specifically, upon reduction of the copper and copper alloy melt, as soon as possible the generated O 2 gas from the melt and in the surface of the molten metal The present invention relates to a method for reducing copper or copper alloy melt that can be removed.
【０００２】[0002]
【従来技術】銅または銅合金は、優れた電気伝導性と熱
伝導性および優れた加工性を有しており、最近、とみに
熱交換器、電子・電気部品等の分野において需要が極め
て旺盛である。2. Description of the Related Art Copper or copper alloys have excellent electric conductivity, heat conductivity and excellent workability. Recently, demands for heat exchangers, electronic and electric parts, etc. have been extremely strong. is there.
【０００３】しかし、このような優れた性質を有してい
る銅または銅合金は、含有されている酸素（以下、Ｏ2
ガスとして説明する。）の量により、銅または銅合金の
特性が著しく損なわれるため、銅または銅合金の製造工
程においてＯ2ガス量の調整が重要な作業となってい
る。このＯ2ガス含有量を低減すること、即ち、還元を
行うことは、その調整工程は溶湯状態においてのみ行わ
れる。[0003] However, copper or a copper alloy having such excellent properties is characterized by the oxygen (hereinafter referred to as O 2 ) contained therein.
Explanation will be given as gas. The amount of (2) significantly impairs the properties of copper or copper alloys, so that adjusting the amount of O 2 gas is an important task in the process of producing copper or copper alloys. In order to reduce the O 2 gas content, that is, to perform reduction, the adjustment step is performed only in the molten metal state.
【０００４】一般的に、溶湯中に含有されているＯ2ガ
スを脱酸により低減する場合、普通、木炭等の還元剤を
溶湯表面に散布して、溶湯中のＯ2ガスをＣＯガスまた
はＣＯ2ガス等のガスとして除去するのである。In general, when the O 2 gas contained in a molten metal is reduced by deoxidation, a reducing agent such as charcoal is usually sprayed on the surface of the molten metal to convert the O 2 gas in the molten metal into CO gas or CO gas. It is removed as a gas such as CO 2 gas.
【０００５】しかしながら、実際にこのような還元にお
いては、還元剤を使用しているにも拘わらず、予測に反
して溶湯中のＯ2ガス含有量が低減しないことが多く発
生しており、初期の目的としたＯ2ガス量とすることが
保証されないという問題がある。[0005] However, in such reduction, in spite of the fact that a reducing agent is used, the O 2 gas content in the molten metal does not often decrease contrary to the prediction, and it often occurs. However, there is a problem that it is not guaranteed that the amount of O 2 gas is aimed at.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記に説明し
た従来における銅および銅合金溶湯中のＯ2ガスの除去
の問題点に鑑み、本発明者が鋭意研究を行い、検討を重
ねた結果、比較的に簡単な手段により、銅または銅合金
溶湯中のＯ2ガス含有量を著しく低減することができる
還元法を開発したのである。SUMMARY OF THE INVENTION In view of the above-described problem of the conventional removal of O 2 gas from copper and copper alloy melts, the present invention has made intensive studies and conducted repeated studies. The present inventors have developed a reduction method capable of remarkably reducing the O 2 gas content in a copper or copper alloy melt by relatively simple means.
【０００７】[0007]
【発明が解決しようとする課題】本発明に係る銅または
銅合金溶湯の還元法の特徴とするところは、銅または銅
合金溶湯の溶湯表面に固体還元剤を散布した後、溶湯中
のＯ ２ ガス分圧より低いＯ ２ ガス分圧の不活性ガスを銅
または銅合金溶湯中に吹き込み、および／または、溶湯
中のＯ ２ ガス分圧より低いＯ ２ ガス分圧の不活性ガスを
銅または銅合金溶湯表面に吹き付けることにより、溶湯
内および／または溶湯表面より還元により生成するＯ２
ガスを除去しながら銅または銅合金溶湯の還元を行うこ
とである。The feature of the method for reducing molten copper or copper alloy according to the present invention is that after a solid reducing agent is sprayed on the surface of the molten copper or copper alloy ,
Blowing of O 2 gas partial low O 2 gas partial pressure than the pressure inert gas to the copper or copper alloy in the molten metal, and / or molten metal
By spraying an inert gas having a partial pressure of O 2 gas lower than the partial pressure of O 2 gas on the surface of the molten copper or copper alloy, O 2 generated by reduction in and / or from the surface of the molten metal.
The reduction of the copper or copper alloy melt while removing the gas.
【０００８】本発明に係る銅または銅合金溶湯の還元法
について、以下詳細に説明する。The method for reducing molten copper or copper alloy according to the present invention will be described in detail below.
【０００９】即ち、銅または銅合金溶湯の表面に、固体
還元剤として、例えば、木炭を満遍なく散布してから、
溶湯中にランスにより不活性ガス等の溶湯中のＯ2ガス
分圧より低いＯ2ガス分圧を有するガスを吹き込み、こ
の吹き込んだガス気泡中のＯ2ガス分圧と溶湯中のＯ2ガ
ス分圧との分圧差を利用して、溶湯中のＯ2ガスを吹き
込んだガス気泡中に拡散、捕集して溶湯中を浮上させ
て、溶湯表面から吹き込んだガスと共にＯ2ガスを放出
させるものである。That is, after the charcoal, for example, charcoal is sprayed evenly as a solid reducing agent on the surface of the copper or copper alloy melt,
Blowing a gas having a low O 2 gas partial pressure than O 2 gas partial pressure in the molten metal in an inert gas or the like by the lance into the melt, O 2 gas partial pressure and O 2 gas in the molten metal in the sparged gas bubbles Utilizing the partial pressure difference from the partial pressure, the O 2 gas in the molten metal is diffused and collected in the gas bubbles blown therein, floated in the molten metal, and the O 2 gas is released together with the gas blown from the surface of the molten metal. Things.
【００１０】また、銅または銅合金溶湯の表面に、固体
還元剤として、例えば、木炭を満遍なく散布してから、
溶湯中にランスにより不活性ガス等の溶湯中のＯ2ガス
分圧より低いＯ2ガス分圧を有するガスを吹き込み、こ
の吹き込んだガス気泡中のＯ2ガス分圧と溶湯中のＯ2ガ
ス分圧との分圧差を利用して、溶湯中のＯ2ガスを吹き
込んだガス気泡中に拡散、捕集して溶湯中を浮上させ
て、溶湯表面から吹き込んだガスと共にＯ2ガスを放出
させ、そして、この放出されたＯ2ガスが再び溶湯中に
溶解しないように、不活性ガス等の溶湯表面のＯ2ガス
分圧（濃度）より低いＯ2ガス分圧を有するガスを、溶
湯表面に吹きけ、溶湯から放出されたＯ2ガスを除去、
即ち、還元を促進するのである。[0010] Further, as a solid reducing agent, for example, charcoal is spread evenly on the surface of the copper or copper alloy melt,
Blowing a gas having a low O 2 gas partial pressure than O 2 gas partial pressure in the molten metal in an inert gas or the like by the lance into the melt, O 2 gas partial pressure and O 2 gas in the molten metal in the sparged gas bubbles Utilizing the partial pressure difference from the partial pressure, the O 2 gas in the molten metal is diffused and collected in the gas bubbles blown, and floated in the molten metal, and the O 2 gas is released together with the gas blown from the surface of the molten metal. , and this as released O 2 gas does not dissolve again in the molten metal, a gas having a low O 2 gas partial pressure than O 2 gas partial pressure (concentration) of the melt surface such as an inert gas, the molten metal surface To remove the O 2 gas released from the molten metal,
That is, reduction is promoted.
【００１１】さらに、銅または銅合金溶湯の表面に、固
体還元剤として、例えば、木炭を満遍なく散布してか
ら、溶湯中にランスにより不活性ガス等の溶湯中のＯ2
ガス分圧より低いＯ2ガス分圧を有するガスを吹き込
み、同時に、溶湯表面に溶湯表面のＯ2ガス分圧より低
いＯ2ガス分圧を有するガスを吹き付けることにより、
この吹き込んだガス気泡中のＯ2ガス分圧と溶湯中のＯ2
ガス分圧との分圧差を利用して、溶湯中のＯ2ガスを吹
き込んだガス気泡中に拡散、捕集して溶湯中を浮上させ
て、溶湯表面から吹き込んだガスと共にＯ2ガスを放出
させ、そして、この放出されたＯ2ガスが再び溶湯中に
溶解しないように、上記したようなガスを溶湯表面にに
吹き付けることにより、溶湯から放出されたＯ2ガスを
除去することができ、即ち、還元が促進されるのであ
る。[0011] Further, as a solid reducing agent, for example, charcoal is evenly spread on the surface of the molten copper or copper alloy, and then O 2 in the molten metal such as an inert gas is lanced into the molten metal by a lance.
Blowing a gas having a low O 2 gas partial pressure than the gas partial pressure, at the same time, by blowing a gas having a low O 2 gas partial pressure than O 2 gas partial pressure of the molten metal surface in the molten metal surface,
O 2 in the O 2 gas partial pressure and the molten metal in the sparged gas bubbles
Utilizing the partial pressure difference from the gas partial pressure, the O 2 gas in the molten metal is diffused and collected in the gas bubbles blown, and floated in the molten metal, and the O 2 gas is released together with the gas blown from the surface of the molten metal. Then, by blowing the above-mentioned gas onto the surface of the molten metal so that the released O 2 gas does not dissolve again in the molten metal, the O 2 gas released from the molten metal can be removed, That is, reduction is promoted.
【００１２】本発明に係る銅または銅合金溶湯の還元法
は、上記の構成であるが、従来における銅または銅合金
溶湯の還元法では、通説として、溶湯中におけるＯ2ガ
スの含有されている状態としては、酸化物（Ｃｕ
2Ｏ）およびその他、および、溶湯中に溶解という２
種類があり、還元剤として、例えば、木炭が溶湯に添加
されると、下記の通り、（木炭はＣとして示す。） 酸化物として存在するＯ2ガスは、Ｃｕ2Ｏ＋Ｃ→Ｃｕ＋
ＣＯ↑ ガスとして溶湯に溶解しているＯ2ガスは、Ｏ2＋Ｃ→Ｃ
Ｏ↑ の反応式に示すように、溶湯中のＣｕ2ＯおよびＯ2ガス
が木炭のＣにより還元され、ＣＯガスとして放出されて
いる。Although the method for reducing molten copper or copper alloy according to the present invention has the above-described structure, the conventional method for reducing molten copper or copper alloy generally contains O 2 gas in the molten metal. Oxide (Cu
2 O) and others, and 2 dissolved in molten metal
When charcoal is added to the molten metal as a reducing agent, for example, as shown below, (charcoal is indicated as C.) O 2 gas existing as an oxide is Cu 2 O + C → Cu +
O 2 gas dissolved in the molten metal as CO ↑ gas is O 2 + C → C
As shown in the reaction formula of O ↑, Cu 2 O and O 2 gas in the molten metal are reduced by C of charcoal and released as CO gas.
【００１３】しかして、本発明に係る銅または銅合金溶
湯の還元法における溶湯中に溶解しているＯ2ガスの挙
動を実測することにより、従来とは異なった結果が得ら
れた。即ち、銅および銅合金溶湯中に含有されている溶
解したＯ2ガスを、分解平衡法を使用した測定法｛特願
昭 ６２−２７２３８０号（特開平０１−１１３６２５
号公報三省）｝参照により実測した。Thus, by measuring the behavior of the O 2 gas dissolved in the molten copper or copper alloy in the method for reducing molten copper or copper alloy according to the present invention, a result different from the conventional one was obtained. That is, a measuring method using a decomposition equilibrium method for dissolved O 2 gas contained in a molten copper and copper alloy is disclosed in Japanese Patent Application No. 62-272380 (Japanese Patent Application Laid-Open No. 01-113625).
Publication No. 3 Ministry of Public Affairs) 実 Measured by reference.
【００１４】この実測結果によると、還元反応前に溶湯
中に含有されているＯ2ガスは全て酸化物（ＣｕＯ、Ｃ
ｕ2Ｏその他）であり、溶湯中には溶解したＯ2ガスは含
有されていないことを確認した。According to the measurement results, all the O 2 gas contained in the molten metal before the reduction reaction is an oxide (CuO, C
u 2 O and others), and it was confirmed that dissolved O 2 gas was not contained in the molten metal.
【００１５】従って、この実測値より、還元反応は以下
示す通りと予測され、即ち、溶湯表面に木炭等の還元剤
が散布されると、 Ｃｕ2Ｏ＋Ｃ→Ｃｕ＋Ｏ2↑ Ｃ＋Ｏ2→ＣＯ2↑ のように、主として溶湯中のＣｕＯ或いはＣｕ2ＯがＣ
（木炭）により還元される反応だけが生じ、この反応に
より生じたＯ2ガスやこのＯ2ガスがＣ（木炭）と反応し
たＣＯ2ガスとして存在することが考えられる。これを
裏付けるために溶湯を上記の方法により改めて測定を行
った結果、従来において通説とされていたＣＯガスに代
わり、Ｏ2ガスおよびＣＯ2ガスが認められた。また、こ
の状態は溶湯表面においても同様であった。Therefore, from the measured values, the reduction reaction is predicted to be as follows: when a reducing agent such as charcoal is sprayed on the surface of the molten metal, Cu 2 O + C → Cu + O 2 ↑ C + O 2 → CO 2のThus, CuO or Cu 2 O in the molten metal is mainly C
It is conceivable that only the reaction reduced by (charcoal) occurs, and the O 2 gas generated by this reaction and the O 2 gas exist as CO 2 gas reacted with C (charcoal). To confirm this, the molten metal was measured again by the above-described method, and as a result, O 2 gas and CO 2 gas were recognized instead of the conventionally-considered CO gas. This condition was the same on the surface of the molten metal.
【００１６】このことから、銅および銅合金溶湯の還元
を行う場合、所期の目的とする効果が得られない主な原
因は、還元反応において新たに発生したＯ2ガスが溶湯
内または溶湯表面直上に残存するために、丁度Ｏ2ガス
が溶湯を被覆するような状態となり、新たに発生したＯ
2ガス等のガスを放出するのを妨害するためである。From the above, when reducing copper and copper alloy melts, the main reason that the intended effect cannot be obtained is that O 2 gas newly generated in the reduction reaction is generated in the melt or on the surface of the melt. O 2 gas just covers the molten metal because it remains immediately above, and the newly generated O 2 gas
This is to prevent emission of gas such as two gases.
【００１７】この場合の変化を図１、図２、図３および
図４により説明すると、図１においては、ガスクロマト
グラフによる溶湯表面直上のガス濃度の変化を示してお
り、木炭（Ｃ）を溶湯表面に添加した時は、Ｏ2ガスお
よびＣＯ2ガスが急激に発生し、時間が経過したも略こ
れらのガスの発生量の変化はなく、ＣＯガスは木炭添加
後殆ど発生しておらず、時間が経過しても発生量は変わ
らない。The change in this case will be described with reference to FIGS. 1, 2, 3 and 4. FIG. 1 shows a change in gas concentration just above the surface of the molten metal by gas chromatography. When added to the surface, O 2 gas and CO 2 gas are rapidly generated, and even after a lapse of time, there is almost no change in the amount of generation of these gases, and CO gas is hardly generated after charcoal addition, The amount does not change over time.
【００１８】図２は分圧平衡法による溶湯中のガス濃度
変化を示しており、木炭（Ｃ）添加後、急激にＯ2ガス
およびＣＯ2ガスの発生し、時間が経過してもこれらガ
ス濃度にはあまり変化はなく、ＣＯガスは木炭添加後に
おいても、殆ど発生しておらず、時間が経過しても発生
量は全然変わっていない。[0018] Figure 2 shows the change in gas concentration in the molten metal by the partial pressure equilibrium method, charcoal (C) after the addition, rapid O 2 generated gas and CO 2 gas, these gases over time The concentration does not change much, and the CO gas is hardly generated even after the charcoal is added, and the amount of generated CO gas does not change at all over time.
【００１９】図３は溶湯表面に木炭（Ｃ）の散布を行う
前においては、溶湯表面にはＯ2ガスとＮ2ガスが存在し
ており、溶湯中にはＣｕ2Ｏ等の酸化物が多量に存在し
ている。しかし、図４においては、溶湯表面に木炭
（Ｃ）を散布・被覆した場合であり、溶湯表面にはＯ2
ガスおよびＣＯ2ガス濃度が大であり、また、溶湯内に
おける溶湯表面近傍においても、Ｏ2ガスおよびＣＯ2ガ
スの溶解量が大であることがわかる。そして、溶湯内に
はＣｕ2Ｏ等の酸化物の量は少なくなっていることがわ
かる。FIG. 3 shows that before spraying charcoal (C) on the surface of the molten metal, O 2 gas and N 2 gas are present on the surface of the molten metal, and oxides such as Cu 2 O are contained in the molten metal. Present in large quantities. However, FIG. 4 shows a case where charcoal (C) is sprayed and covered on the surface of the molten metal, and O 2 is applied on the surface of the molten metal.
It can be seen that the gas and CO 2 gas concentrations are large, and the dissolved amounts of the O 2 gas and CO 2 gas are also large near the surface of the molten metal in the molten metal. Then, in the molten metal it can be seen that the running low amount of oxide such as Cu 2 O.
【００２０】従って、上記に説明したように、銅または
銅合金溶湯の還元を行う場合、還元反応により発生した
Ｏ2ガスおよびＣＯ2ガスを溶湯内および溶湯表面直上か
ら、速やかに系外に放出する必要があり、この放出手段
としては、不活性ガス等の溶湯中に新たに発生したＯ2
ガス分圧より低いＯ2ガス分圧のガスを吹き込み、この
分圧差により吹き込んだガス中に溶湯中のＯ2ガスを拡
散・捕集し、系外に放出するのである。Therefore, as described above, when the copper or copper alloy melt is reduced, the O 2 gas and CO 2 gas generated by the reduction reaction are immediately discharged from the melt and directly above the melt surface to the outside of the system. It is necessary to release O 2 newly generated in the molten metal such as inert gas.
A gas having a partial pressure of O 2 gas lower than the gas partial pressure is blown, and the O 2 gas in the molten metal is diffused and collected into the blown gas by the partial pressure difference, and is discharged out of the system.
【００２１】そして、銅溶湯の場合に、この新たに発生
したＯ2ガスの放出について説明すると、電気銅地金１
００％を１トン溶解炉により１２００℃±２０℃の温度
で溶解を行い、次いで、この銅溶湯重量の１％の木炭を
溶湯表面に散布して被覆を行った後、不活性ガスを溶湯
内に３分φ径のランスにより３０Ｎｌ／分の割合で吹き
込むと同時に溶湯表面に３０Ｎｌ／分の割合で不活性ガ
スの吹き付けを行い、その後、鋳造してから加工を行っ
た。The release of the newly generated O 2 gas in the case of molten copper will be described.
00% is melted in a 1-ton melting furnace at a temperature of 1200 ° C. ± 20 ° C. Then, charcoal of 1% of the weight of the copper melt is sprayed on the surface of the melt to perform coating. At the same time, an inert gas was blown at a rate of 30 Nl / min onto the surface of the molten metal at a rate of 30 Nl / min by a lance having a diameter of 3 minutes, and then cast and worked.
【００２２】この場合の溶湯中のＯ2ガス濃度（ガス±
酸化物合計）と時間との関係を図５に示すが、Ａｒ処理
を行わない場合には、Ｏ2ガス濃度は時間が経過しても
変化がなく、また、Ａｒガスを溶湯中に吹き込んだ場合
および溶湯表面に吹き付けた場合は共に時間の経過と共
にＯ2ガス濃度は低くなっており、さらに、Ａｒガスを
溶湯内吹き込みと溶湯表面に吹き付けた場合には、格段
にＯ2ガス濃度は低くなっていることがわかる。In this case, the O 2 gas concentration (gas ±
FIG. 5 shows the relationship between the total oxides and the time. When the Ar treatment was not performed, the O 2 gas concentration did not change even after the lapse of time, and the Ar gas was blown into the molten metal. In both cases and when sprayed on the surface of the molten metal, the O 2 gas concentration decreases with the passage of time, and when Ar gas is blown into the molten metal and sprayed on the surface of the molten metal, the O 2 gas concentration is significantly lower. You can see that it is.
【００２３】また、銅合金溶湯の場合に、新たに発生し
たＯ2ガスの放出について説明すると、Ｃｕ−Ｆｅ系合
金屑（ＫＬＦ−１９４）１００％を１トン溶解炉におい
て１２００℃±２０℃の温度で溶解を行い、溶解後溶湯
重量の１％の木炭を溶湯表面に散布して被覆し、次い
で、溶湯中に径３分φのランスにより３０Ｎｌ／分の割
合で不活性ガスを吹き込むと同時に溶湯表面に３０Ｎｌ
／分の割合で不活性ガスの吹き付けを行い、鋳造後加工
を行った。The release of newly generated O 2 gas in the case of molten copper alloy will be described. 100% of Cu—Fe alloy scrap (KLF-194) is melted at 1200 ° C. ± 20 ° C. in a 1-ton melting furnace. Melting is performed at a temperature, and after melting, charcoal of 1% by weight of the molten metal is sprayed on the surface of the molten metal to cover the molten metal, and then an inert gas is blown into the molten metal at a rate of 30 Nl / min by a lance having a diameter of 3 minutes φ. 30Nl on the melt surface
/ Inert gas was blown at a rate of / minute to perform post-casting processing.
【００２４】この場合の溶湯中のＯ2ガス濃度（ガス＋
酸化物合計）と時間との関係を図６に示すが、Ａｒ処理
を行わない場合には、Ｏ2ガス濃度は時間が経過しても
変化がなく、また、Ａｒガスを溶湯中に吹き込んだ場合
および溶湯表面に吹き付けた場合は共に時間の経過と共
にＯ2ガス濃度は低くなっており、さらに、Ａｒガスを
溶湯内吹き込みと溶湯表面に吹き付けた場合には、格段
にＯ2ガス濃度は低くなっていることがわかる。In this case, the O 2 gas concentration in the molten metal (gas +
FIG. 6 shows the relationship between the total oxides) and the time. When the Ar treatment was not performed, the O 2 gas concentration did not change even after the lapse of time, and the Ar gas was blown into the molten metal. In both cases and when sprayed on the surface of the molten metal, the O 2 gas concentration decreases with the passage of time, and when Ar gas is blown into the molten metal and sprayed on the surface of the molten metal, the O 2 gas concentration is significantly lower. You can see that it is.
【００２５】[0025]
【実 施 例】本発明に係る銅または銅合金溶湯の還元
法について、以下実施例を説明する。EXAMPLES Examples of the method for reducing molten copper or copper alloy according to the present invention will be described below.
【００２６】[0026]
【実 施 例】以下の条件により銅溶湯の還元を行った。 銅溶湯量 ２５０ｋｇ 溶解温度 １２５０℃ 木炭量 ５ｋｇ 不活性ガス量 １０〜１３ｌ／分（アルゴンガス・バ
ブラー吹き込み） 銅溶湯酸素量調整＝大気溶解＋ＣｕＯ添加[Example] The copper melt was reduced under the following conditions. Copper melt 250 kg Melting temperature 1250 ° C Charcoal 5 kg Inert gas 10-13 l / min (injection of argon gas and bubbler) Copper melt oxygen adjustment = atmospheric melting + CuO addition
【００２７】図７に還元後の結果を示す。即ち、還元初
期においては酸素量が５２００ｐｐｍであったものが、
上記条件により還元を行ったところ、脱酸速度２５２ｐ
ｐｍ／分の割合で２０分後には酸素量は１５５ｐｐｍに
低下し、さらに、４０分後には１９ｐｐｍにまで極めて
低濃度にまで低下していることがわかる。しかし、その
後時間が経過すると、６０分後には２０ｐｐｍ、９０分
後には２７ｐｐｍとＯ2ガス濃度が増加する傾向にあ
る。従って、酸素量が最低になる時間において還元を停
止することがよい。また、図８に銅合金における溶湯中
の酸素量と処理時間との関係を示す。この場合、上記に
説明した銅溶湯と同じ条件により還元を行った。この図
８から、還元初期においては、酸素量が８０００ｐｐｍ
であったものが、２０分後には略２５０ｐｐｍ程度にま
で低下しており、４０分後以降は酸素量は略零にまで低
下していることがわかる。FIG. 7 shows the result after reduction. That is, although the amount of oxygen was 5200 ppm in the initial stage of reduction,
After reduction under the above conditions, the deoxidation rate was 252 p.
It can be seen that the oxygen content is reduced to 155 ppm after 20 minutes at a rate of pm / min, and further reduced to as low as 19 ppm after 40 minutes. However, when the time elapses thereafter, the O 2 gas concentration tends to increase to 20 ppm after 60 minutes and to 27 ppm after 90 minutes. Therefore, it is preferable to stop the reduction at the time when the amount of oxygen becomes minimum. FIG. 8 shows the relationship between the amount of oxygen in the molten metal and the processing time in the copper alloy. In this case, the reduction was performed under the same conditions as for the copper melt described above. From FIG. 8, in the initial stage of the reduction, the oxygen amount was 8000 ppm.
However, it can be seen that after 20 minutes, it decreased to approximately 250 ppm, and after 40 minutes, the oxygen amount decreased to approximately zero.
【００２８】[0028]
【発明の効果】以上説明したように、本発明に係る銅ま
たは銅合金溶湯の還元法は上記の構成であるから、溶湯
表面に木炭（Ｃ）を散布・被覆した後に、溶湯中のＯ2
ガス分圧より低いＯ2ガス分圧の不活性ガスを溶湯内に
吹き込むか、または、溶湯表面に吹き付けるか、さら
に、溶湯内および溶湯表面に同時に行うことによって、
溶湯内の還元により発生したＯ2ガス濃度（ガス＋酸化
物合計）は極めて低くなるという優れた効果を有するも
のである。As described above, since the method for reducing a copper or copper alloy melt according to the present invention has the above-described structure, after charcoal (C) is sprayed and coated on the surface of the melt, O 2 in the melt is removed.
By blowing an inert gas with a partial pressure of O 2 gas lower than the gas partial pressure into the molten metal, or by blowing it on the surface of the molten metal, and furthermore, by simultaneously performing the inside of the molten metal and the surface of the molten metal,
It has an excellent effect that the concentration of O 2 gas (gas + oxide sum) generated by reduction in the molten metal is extremely low.
【図１】溶湯表面直上のガス濃度と時間との関係を示す
図である。FIG. 1 is a diagram showing a relationship between a gas concentration immediately above a molten metal surface and time.
【図２】溶湯中のガス濃度と時間との関係を示す図であ
る。FIG. 2 is a diagram showing a relationship between gas concentration in molten metal and time.
【図３】溶湯表面に木炭を散布・被覆する前の溶湯内と
溶湯表面の状態を示す模式図である。FIG. 3 is a schematic diagram showing a state of the inside of the molten metal and the surface of the molten metal before spraying and covering charcoal on the surface of the molten metal.
【図４】溶湯表面に木炭を散布・被覆した後の溶湯内と
溶湯表面のガスの分布状態を示す図である。FIG. 4 is a view showing a gas distribution state in the molten metal and on the surface of the molten metal after spraying and covering charcoal on the surface of the molten metal.
【図５】銅溶湯の還元について、不活性ガス処理の有
無、溶湯内に吹き込んだ場合、溶湯表面に吹き付けた場
合およびこの両方を行った場合のＯ2ガス濃度（ガス＋
酸化物合計）と時間との関係を示す図である。FIG. 5 shows the reduction of the molten copper in the presence or absence of the inert gas treatment, the O 2 gas concentration (gas +
FIG. 3 is a diagram showing a relationship between total oxides) and time.
【図６】銅合金溶湯の還元について、不活性ガス処理の
有無、溶湯内に吹き込んだ場合、 溶湯表面に吹き付け
た場合およびこの両方を行った場合のＯ2ガス濃度（ガ
ス ＋酸化物合計）と時間との関係を示す図である。[6] for the reduction of the molten copper alloy, the presence of the inert gas, when blown into the molten metal, when sprayed on the surface of the molten metal and O 2 gas concentration in the case of performing both (gas + oxide total) FIG. 6 is a diagram showing a relationship between time and time.
【図７】実施例における還元の場合の、銅溶湯中の酸素
量と処理時間との関係を示す図である。FIG. 7 is a diagram showing the relationship between the amount of oxygen in the molten copper and the processing time in the case of reduction in an example.
【図８】銅合金溶湯中の酸素量と処理時間との関係を示
す図である。FIG. 8 is a diagram showing the relationship between the amount of oxygen in the molten copper alloy and the processing time.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡 田 裕 文 山口県下関市長府紺屋町１−32 (72)発明者 浜 中 龍 介 山口県下関市長府黒門東町３番Ｆ303 (56)参考文献 特開 昭51−99620（ＪＰ，Ａ) 特開 昭58−177422（ＪＰ，Ａ) 特開 昭59−205428（ＪＰ，Ａ) ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hirofumi Okada 1-32 Konyacho, Nagafu, Shimonoseki City, Yamaguchi Prefecture (72) Ryusuke Hamanaka, No. 3 F303, Kuromon Higashicho, Nagafu, Shimonoseki City, Yamaguchi Prefecture (56) References Special JP-A-51-99620 (JP, A) JP-A-58-177422 (JP, A) JP-A-59-205428 (JP, A)
Claims (1)
元剤を散布した後、溶湯中のＯ ２ ガス分圧より低いＯ ２
ガス分圧の不活性ガスを銅または銅合金溶湯中に吹き込
み、および／または、溶湯中のＯ ２ ガス分圧より低いＯ
２ ガス分圧の不活性ガスを銅または銅合金溶湯表面に吹
き付けることにより、溶湯内および／または溶湯表面よ
り還元により生成するＯ２ガスを除去しながら銅または
銅合金溶湯の還元を行うことを特徴とする銅または銅合
金溶湯の還元法。[Claim 1] After spraying solid reducing agent to the melt surface of the copper or copper alloy melt, below the O 2 gas partial pressure in the molten metal O 2
Inert gas at a partial pressure of gas is blown into the molten copper or copper alloy and / or O 2 gas which is lower than the partial pressure of O 2 gas in the molten metal.
By blowing an inert gas having a partial pressure of 2 gas onto the surface of the molten copper or copper alloy, it is possible to reduce the molten copper or copper alloy while removing O 2 gas generated by reduction in and / or from the surface of the molten metal. Characteristic method for reducing molten copper or copper alloy.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19998591A JP2636985B2 (en) | 1991-07-15 | 1991-07-15 | Reduction method of molten copper or copper alloy |
| PCT/JP1992/000358 WO1993002219A1 (en) | 1991-07-15 | 1992-03-25 | Process for purifying raw material of copper or its alloy |
| EP92907624A EP0548363B1 (en) | 1991-07-15 | 1992-03-25 | Process for refining raw material for copper or its alloys |
| DE69229387T DE69229387T2 (en) | 1991-07-15 | 1992-03-25 | METHOD FOR CLEANING COPPER RAW MATERIAL FOR COPPER OR ITS ALLOYS |
| US07/988,960 US5364449A (en) | 1991-07-15 | 1992-03-25 | Process for refining crude material for copper or copper alloy |
| CA002091677A CA2091677C (en) | 1991-07-15 | 1992-03-25 | Process for refining crude material for copper or copper alloy |
| FI931112A FI104268B1 (en) | 1991-07-15 | 1993-03-12 | Process for the purification of raw materials for copper or copper alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19998591A JP2636985B2 (en) | 1991-07-15 | 1991-07-15 | Reduction method of molten copper or copper alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0525559A JPH0525559A (en) | 1993-02-02 |
| JP2636985B2 true JP2636985B2 (en) | 1997-08-06 |
Family
ID=16416875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19998591A Expired - Lifetime JP2636985B2 (en) | 1991-07-15 | 1991-07-15 | Reduction method of molten copper or copper alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2636985B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5199620A (en) * | 1975-02-28 | 1976-09-02 | Furukawa Electric Co Ltd | RONAIFUNIKI SEIGYOHOHO |
| JPS58177422A (en) * | 1982-04-13 | 1983-10-18 | Mitsubishi Metal Corp | Method for refining molten copper |
| JPS59205428A (en) * | 1983-05-02 | 1984-11-21 | Nippon Mining Co Ltd | Reductive refining method of black copper |
-
1991
- 1991-07-15 JP JP19998591A patent/JP2636985B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0525559A (en) | 1993-02-02 |
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