JPH01170556A - Cleaning method for molten metal - Google Patents
Cleaning method for molten metalInfo
- Publication number
- JPH01170556A JPH01170556A JP62326723A JP32672387A JPH01170556A JP H01170556 A JPH01170556 A JP H01170556A JP 62326723 A JP62326723 A JP 62326723A JP 32672387 A JP32672387 A JP 32672387A JP H01170556 A JPH01170556 A JP H01170556A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- gas
- pressure
- bubbling
- floating
- 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
- 239000002184 metal Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 18
- 238000004140 cleaning Methods 0.000 title claims description 5
- 230000005587 bubbling Effects 0.000 claims abstract description 15
- 238000007667 floating Methods 0.000 claims abstract description 9
- 230000003068 static effect Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 230000008018 melting Effects 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、溶融金属中に浮遊する介在物を除去する溶
融金属の清浄化方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for cleaning molten metal by removing inclusions floating in the molten metal.
溶融金属中に浮遊する介在物(例えば溶鋼中のアルミナ
系介在物)は、製品品質欠陥の原因となるため、その低
減・除去方法が種々提案されている。Inclusions floating in molten metal (for example, alumina inclusions in molten steel) cause product quality defects, and various methods have been proposed to reduce and remove them.
その中で比較的効率が良いとして多用されている方法に
、常圧下で容器の底から溶融金属中に不活性ガスをバブ
リングすることで、ガス気泡に介在物をトラップさせ、
浮上後これを除去する方法がある。Among these methods, one method that is widely used as it is relatively efficient is to bubble inert gas into the molten metal from the bottom of the container under normal pressure to trap inclusions in the gas bubbles.
There is a way to remove this after surfacing.
高級材製造を目的とした場合、溶鋼中のトータル酸素量
は10ppm以下に抑える必要がある。When the purpose is to manufacture high-grade materials, the total amount of oxygen in molten steel must be suppressed to 10 ppm or less.
しかし、上記の方法によってはこのような溶融金属の超
清浄化の要請を達成し得ないという問題があり、新たな
手段の開発が望まれていた。However, there is a problem in that the above-mentioned methods cannot meet the requirement for ultra-cleaning of molten metal, and there has been a desire to develop a new method.
即ち、従来のガスバブリング法では、バブリング領域が
容器底面のガス吹込み口から上方に摺り林状に広がる領
域だけであり、しかも吹込み方法の制約から容器全域か
らバブリングすることは難しいという問題があった。又
、パブリングによりできる気泡の大きさが大きいという
ことが原因となり、該気泡が浮上する際、溶融金属はそ
の周りを迂回するように流れ、その流れと一緒に微細介
在物もこの気泡を避けて移動するため、微細介在物は気
泡にトラップされにくいといった問題もある。In other words, in the conventional gas bubbling method, the bubbling region is limited to an area that spreads upward from the gas inlet at the bottom of the container in a forest-like manner, and furthermore, there is a problem in that it is difficult to bubble from the entire area of the container due to restrictions on the bubbling method. there were. Another cause is that the bubbles created by bubbling are large, and when the bubbles float to the surface, the molten metal flows around them, and along with the flow, fine inclusions also avoid the bubbles. There is also the problem that fine inclusions are difficult to be trapped by air bubbles because they move.
そのため本発明者等は、本件出願と略同時に、上記の問
題を解決するための提案を行った。その提案内容は、加
圧状態にした溶融金属を、それに可溶なガスでバブリン
グして該溶融金属中にガスを溶解せしめ、その後急速に
減圧して溶融金属中に微細ガス気泡を発生させ、溶融金
属中に浮遊する介在物をバブリングによるガス気泡及び
減圧により発生した微細ガス気泡にトラップせしめて、
浮上後これを除去するというものである。Therefore, the present inventors made a proposal to solve the above problem almost at the same time as filing the present application. The proposal involves bubbling pressurized molten metal with a soluble gas to dissolve the gas in the molten metal, and then rapidly reducing the pressure to generate fine gas bubbles in the molten metal. Inclusions floating in the molten metal are trapped in gas bubbles caused by bubbling and fine gas bubbles generated by reduced pressure,
This is removed after levitation.
溶融金属中の通常の介在物は最初のバブリングでトラッ
プされ浮上せしめられぬことになる。Normal inclusions in the molten metal will be trapped by the initial bubbling and will not be brought to the surface.
他方、このバブリングは加圧した溶融金属に対して行わ
れるため、バブリングガスが多量に溶融金属中に溶は込
むことになる。その後の急速な減圧で、溶融金属中に溶
は込んでいたガスが微細なガス気泡となって溶融金属全
域から発生する。この時、微細な介在物は該ガス気泡に
トラップされて浮上する。On the other hand, since this bubbling is performed on the pressurized molten metal, a large amount of bubbling gas melts into the molten metal. The subsequent rapid depressurization causes the gas that had entered the molten metal to become fine gas bubbles that are generated from the entire area of the molten metal. At this time, fine inclusions are trapped by the gas bubbles and float up.
このように溶融金属中の介在物を除去するには、極めて
効率の良い優れた方法ではあるが、バブリングによるガ
ス気泡及び減圧により発生した無数の微細ガス気泡が溶
融金属の表面まで浮上する時に湯面が上下にバタツクた
め、浮上した介在物が再度溶融金属内に混入してしまう
という問題が別に発生しており、理論的には優れたもの
であっても、実際上はまだ解決すべき問題を有していた
。Although this is an extremely efficient and excellent method for removing inclusions from molten metal, it is difficult to remove the inclusions from the molten metal when the gas bubbles caused by bubbling and the countless fine gas bubbles generated by reduced pressure rise to the surface of the molten metal. Because the surface flaps up and down, there is another problem that floating inclusions get mixed into the molten metal again, and even though it is excellent in theory, it is still a problem that still needs to be solved in practice. It had
本発明は、上記の問題を解決するためなされたもので、
その方法を改良し、湯面のバタツキを抑えて浮上した介
在物の除去を効率良く行えるようにするものである。The present invention was made to solve the above problems, and
This method has been improved so that floating inclusions can be efficiently removed by suppressing the fluttering of the hot water surface.
そのため本発明は、バブリングによるガス気泡及び減圧
により発生した微細ガス気泡にトラップされて介在物が
浮上してくる時に、第1図に示すように界面1に静磁場
をかけることを基本的特徴としている。Therefore, the basic feature of the present invention is to apply a static magnetic field to the interface 1 as shown in FIG. There is.
鋼浴等の浴の流れに対して直角方向に磁場をかけると、
その流れに対する制動力が生じる。When a magnetic field is applied perpendicular to the flow of a bath such as a steel bath,
A braking force is generated against the flow.
上記の溶融金属界面1のバタツキは、丁度上下方向の浴
の流れに相当するので、該界面1に静磁場をかけること
で、上下方向の流れを抑止する力が生じ、バタツキの振
幅を小さくせしめて界面1の波立ちを防ぐことができる
。The above mentioned fluttering at the molten metal interface 1 corresponds to the flow of the bath in the vertical direction, so by applying a static magnetic field to the interface 1, a force is generated to suppress the vertical flow, reducing the amplitude of the fluttering. This can prevent ripples on the interface 1.
以下、本発明の具体的実施例につき説明する。 Hereinafter, specific examples of the present invention will be described.
第2図に示すように内径2m、高さ3mの圧力容器2内
に、その底から2mの高さまで鋼浴3を注湯し、内部雰
囲気をArガスに置換せしめて、容器2底面より、Ar
ガスニア0%、H2ガス:30%からなる混合ガスを、
300 Q /winの吹込み速度で20分間該鋼浴3
中にバブリングした。このとき、圧力は最高10at1
1まで高めた。それ以降、第3図に示すように、電磁石
4により鋼浴3の湯面1aに静磁場を印加し、該湯面1
aにバタツキを抑える力Fを生せしめた。この抑制力F
は下式で求めることができる。As shown in FIG. 2, a steel bath 3 is poured into a pressure vessel 2 with an inner diameter of 2 m and a height of 3 m to a height of 2 m from the bottom, and the internal atmosphere is replaced with Ar gas. Ar
A mixed gas consisting of 0% Gasnia and 30% H2 gas,
The steel bath 3 was heated for 20 minutes at a blowing rate of 300 Q/win.
It bubbled inside. At this time, the maximum pressure is 10at1
Raised it to 1. After that, as shown in FIG. 3, a static magnetic field is applied to the hot water surface 1a of the steel bath 3 by the electromagnet 4,
The force F that suppresses the flapping is generated in a. This suppressing force F
can be calculated using the formula below.
F=σB2υ
但し、σ:鋼浴の電気伝導率
B:磁束密度
υ:湯面の上下方向への流速
その後、混合ガスのバブリングを止め、調圧弁5により
容器2内を急速に減圧し、鋼浴3全域から微細なガス気
泡を発生させた。本実施例ではこの時も湯面1aに静磁
場を印加している。F=σB2υ However, σ: Electrical conductivity of the steel bath B: Magnetic flux density υ: Flow velocity in the vertical direction of the hot water surface After that, bubbling of the mixed gas is stopped, the pressure inside the container 2 is rapidly reduced by the pressure regulating valve 5, and the steel bath is Fine gas bubbles were generated from the entire bath 3 area. In this embodiment, a static magnetic field is also applied to the hot water surface 1a at this time.
第4図は、この静磁場の印加による湯面1aのバタツキ
の変化を、X軸に静磁場の磁束密度をとって示したもの
である。この図によれば、磁束密度が1000ガウス以
上になった時から、湯面laのバタツキの抑止効果が表
われ、5oooガウス以上になると、その効果も飽和す
ることになる。FIG. 4 shows the change in the fluttering of the hot water surface 1a due to the application of this static magnetic field, with the magnetic flux density of the static magnetic field plotted on the X-axis. According to this figure, the effect of suppressing the fluttering of the hot water surface la appears when the magnetic flux density reaches 1000 Gauss or more, and this effect becomes saturated when it reaches 500 Gauss or more.
以上説明したように、本発明法によれば、電磁力で界面
を安定させ界面のバタツキを的確に抑えることができる
ため、本願と略同時に提案された方法の実施により溶融
金属の界面に浮上してきた介在物は、再び溶融金属内へ
混入してしまうこともなく、界面付近で脱取されること
になる。As explained above, according to the method of the present invention, it is possible to stabilize the interface using electromagnetic force and accurately suppress the fluttering of the interface. These inclusions will not be mixed into the molten metal again and will be removed near the interface.
第1図は本発明法の説明図、第2図は本発明法の実施に
あたり使用された圧力容器の構成を示す概要図、第3図
は本発明法の実施例を示す説明図、第4図は本実施例に
おける湯面のバタツキの変化を示すグラフ図である。
図中、1は界面、2は圧力容器、3は鋼浴、4は電磁石
、5は調圧弁を各示す。
第 1 図
第2図
手続補正書(自船
昭和63年10月28日FIG. 1 is an explanatory diagram of the method of the present invention, FIG. 2 is a schematic diagram showing the configuration of a pressure vessel used in carrying out the method of the present invention, FIG. 3 is an explanatory diagram showing an example of the method of the present invention, and FIG. The figure is a graph diagram showing changes in the fluttering of the hot water level in this example. In the figure, 1 is an interface, 2 is a pressure vessel, 3 is a steel bath, 4 is an electromagnet, and 5 is a pressure regulating valve. Figure 1 Figure 2 Procedure Amendment (October 28, 1988)
Claims (1)
ングして該溶融金属中にガスを溶解せしめ、その後急速
に減圧して溶融金属中に微細ガス気泡を発生させ、溶融
金属中に浮遊する介在物をバブリングによるガス気泡及
び減圧により発生した微細ガス気泡にトラップせしめて
、浮上後これを除去する溶融金属の清浄化方法を実施す
るにあたり、バブリングによるガス気泡及び減圧により
発生した微細ガス気泡にトラップされて介在物が浮上し
てくる時に、界面に静磁場をかけることを特徴とする溶
融金属の清浄化方法。Pressurized molten metal is bubbled with a soluble gas to dissolve the gas in the molten metal, and then the pressure is rapidly reduced to generate fine gas bubbles in the molten metal, which are then suspended in the molten metal. In carrying out a molten metal cleaning method in which inclusions are trapped in gas bubbles caused by bubbling and fine gas bubbles generated by depressurization, and then removed after floating, gas bubbles caused by bubbling and fine gas bubbles generated by depressurization are removed. A method for cleaning molten metal characterized by applying a static magnetic field to the interface when inclusions are trapped and float to the surface.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62326723A JPH01170556A (en) | 1987-12-25 | 1987-12-25 | Cleaning method for molten metal |
AU27038/88A AU605949B2 (en) | 1987-12-25 | 1988-12-19 | Method for cleaning molten metal and apparatus therefor |
DE88121503T DE3883190T2 (en) | 1987-12-25 | 1988-12-22 | Method and device for refining molten metals. |
EP88121503A EP0322763B1 (en) | 1987-12-25 | 1988-12-22 | Method for cleaning molten metal and apparatus therefor |
CA000586963A CA1337744C (en) | 1987-12-25 | 1988-12-23 | Method for cleaning molten metal and apparatus therefor |
KR1019880017424A KR930005065B1 (en) | 1987-12-25 | 1988-12-24 | Method for cleaning molten metal and apparatus therefor |
BR888806870A BR8806870A (en) | 1987-12-25 | 1988-12-26 | METHOD AND APPLIANCE FOR FUSING METAL CLEANING |
US07/516,478 US5091000A (en) | 1987-12-25 | 1990-04-30 | Method for cleaning molten metal and apparatus therefor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62326723A JPH01170556A (en) | 1987-12-25 | 1987-12-25 | Cleaning method for molten metal |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01170556A true JPH01170556A (en) | 1989-07-05 |
JPH055576B2 JPH055576B2 (en) | 1993-01-22 |
Family
ID=18190956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62326723A Granted JPH01170556A (en) | 1987-12-25 | 1987-12-25 | Cleaning method for molten metal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01170556A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6299506B2 (en) * | 1997-03-21 | 2001-10-09 | Canon Kabushiki Kaisha | Polishing apparatus including holder and polishing head with rotational axis of polishing head offset from rotational axis of holder and method of using |
-
1987
- 1987-12-25 JP JP62326723A patent/JPH01170556A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6299506B2 (en) * | 1997-03-21 | 2001-10-09 | Canon Kabushiki Kaisha | Polishing apparatus including holder and polishing head with rotational axis of polishing head offset from rotational axis of holder and method of using |
Also Published As
Publication number | Publication date |
---|---|
JPH055576B2 (en) | 1993-01-22 |
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