JP3428115B2 - Flux for refining Al or Al alloy melt - Google Patents
Flux for refining Al or Al alloy meltInfo
- Publication number
- JP3428115B2 JP3428115B2 JP00328794A JP328794A JP3428115B2 JP 3428115 B2 JP3428115 B2 JP 3428115B2 JP 00328794 A JP00328794 A JP 00328794A JP 328794 A JP328794 A JP 328794A JP 3428115 B2 JP3428115 B2 JP 3428115B2
- Authority
- JP
- Japan
- Prior art keywords
- flux
- hydrogen
- refining
- alloy
- molten metal
- 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 - Fee Related
Links
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、ＡｌまたはＡｌ合金溶
湯中に吹き込む精錬用フラックスに関するものであり、
特に溶湯中の水素を極力低減することのできる精錬用フ
ラックスに関するものである。
【０００２】
【従来の技術】ＡｌまたはＡｌ合金（以下、Ａｌ合金で
代表することがある）は、軽量で、成型性やファッショ
ン性等の点で優れた特徴を有しており、建築用アルミサ
ッシを始めとして様々な分野で使用されている。しかし
ながら、Ａｌ合金製品中の水素ガス濃度が上昇すると、
製品表面にピンホール欠陥、加工不良等の問題を生じる
という点が指摘される。
【０００３】ところで溶湯から不純物としての水素を除
去することは著しく困難であると言われている。実用化
された方法としては、例えば特公昭６０−４５９２９号
に提示されるように、不活性ガスを溶湯に吹き込む方法
が提案されている。しかしながらこの方法では、溶湯に
分散させた不活性ガスの水素分圧と溶湯中の水素分圧と
の差を利用するものであるため、Ａｌ合金溶湯中に大量
の水素が含有される場合には、期待するほどの効果が得
られない。また塩素ガスや塩化物系フラックスを不活性
ガスとともに吹き込む方法も知られている。しかしなが
ら、塩化物系の材料を使用すると、有害な塩素ガスを発
生するので環境汚染の点で問題がある。更に、塩化物を
含まないフラックスも提案されているが（例えば特開平
２−２７０９２４号）、更なる性能向上が望まれてい
る。
【０００４】
【発明が解決しようとする課題】本発明はこの様な事情
に着目してなされたものであって、その目的は、有害な
塩素ガス等を発生することなく、ＡｌまたはＡｌ合金溶
湯中の水素を極力低減することのできる精錬用フラック
スを提供することにある。
【０００５】
【課題を解決するための手段】上記目的を達成した本発
明とは、ＡｌまたはＡｌ合金溶湯中に吹き込む精錬用フ
ラックスであって、Ｋ2ＳＯ4の含有量が６０〜９９重量
％であると共に、Ｌｉ2ＳＯ4，Ｌｉ2Ｂ3Ｏ7，Ｌｉ2ＣＯ
3およびＭｇＳＯ4よりなる群から選ばれる１種または２
種以上の化合物の含有量が１〜４０重量％である点に要
旨を有するＡｌまたはＡｌ合金溶湯精錬用フラックスで
ある。
【０００６】
【作用】本発明者らは、Ａｌ合金溶湯中に不純物として
存在する水素の除去を可能にするには、水素と何等かの
元素または化合物を反応させ、水素を含有する化合物を
生成させ、その後ＡｌまたはＡｌ合金の融点である６６
０℃前後の温度でこの水素化合物を気体化させるか、或
はこの水素と反応した固体化合物を除去することによっ
て、溶湯中の水素が除去できると考えた。
【０００７】そして上記化合物の反応に利用できる元素
として、本発明者等は、カリウムとリチウムが水素と反
応し化合物を形成しやすいと考えた。即ち、これらの元
素を含有する化合物を、ＡｌまたはＡｌ合金の溶湯中に
接触させる様にすれば、不純物元素である水素の除去が
可能であると考えたのである。またこれらの化合物の具
体的ものとして、硫酸カリウムとホウ酸リチウムが挙げ
られた。
【０００８】上記硫酸カリウムやホウ酸リチウム等は、
単体での融点がＡｌの融点より高く、脱水素の反応に対
し、気体−固体反応で進むことになる。そこで発明者等
は混合剤の融点を下げ、Ａｌの融点に近づけることによ
って、液体−液体反応とし、より反応が迅速に進行する
手段についても検討した。
【０００９】その結果、硫酸カリウムを主体とした精練
剤に関しては、混合による融点降下を目的として、硫酸
リチウム（Ｌｉ2ＳＯ4）や硫酸マグネシウム（ＭｇＳＯ
4）を混合すれば、精練能を向上させることが可能であ
ることが分かった。また、同じ目的で炭酸リチウム（Ｌ
ｉ2ＣＯ3）を混合することにより、精練能が向上するこ
とも分かった。またこれらの化合物（Ｌｉ2ＳＯ4，Ｍｇ
ＳＯ4，Ｌｉ2ＣＯ3）は、硫酸カリウムを主体としホウ
酸リチウムを含まないフラックスに混合しても本発明の
目的が達成されることが分かった。即ち、本発明の精錬
用フラックスは、Ｋ2ＳＯ4を主体とする他、リチウム化
合物（Ｌｉ2ＳＯ4，Ｌｉ2Ｂ3Ｏ7，Ｌｉ2ＣＯ3）および
／またはマグネシウム化合物（ＭｇＳＯ4）を含んでい
れば良い。
【００１０】但し、本発明のフラックスにおいて、フラ
ックスの融点を完全にアルミニウム溶湯の温度まで下げ
ると、ノズルにより不活性ガスをキャリアガスとして吹
き込む場合、ノズル先端部においてフラックスが融体化
し、ノズルが詰まる現象が見られる。このため、精練を
行い、溶湯中の水素濃度が０．１５ｃｃ／１００ｇ（Ａ
ｌ）未満となるように精練を行った場合、ノズル詰まり
を発生することなくフラックスを吹き込める様な混合組
成範囲が存在する（後記実施例参照）。その範囲は、フ
ラックス成分によって多少異なるが、ほぼＫ2 ＳＯ4 の
含有量が６０〜９９重量％であり、他の化合物（Ｌｉ2
ＳＯ4 ，Ｌｉ2 Ｂ3 Ｏ7 ，Ｌｉ2 ＣＯ3およびＭｇＳＯ4
よりなる群から選ばれる化合物）の含有量が１〜４０
重量％の場合である。
【００１１】
【実施例】下記表１および表２に示す精錬用フラックス
を用い、下記の溶解条件によって精錬を行ない、溶湯中
の水素濃度の測定およびノズル詰まりの有無について調
査した。
（溶解条件）
溶解炉 ：反射型溶解炉（ＬＮＧだき）、大
気溶解
溶解温度 ：７７５℃
溶湯重量 ：１トン
水素初期含有量 ：０．３ｃｃ／１００ｇ（Ａｌ）
精練剤添加方法 ：添加ため不活性キャリアーガスと
して窒素ガスを用２０Ｎリットル／分で溶湯に添加し
た。
精練剤添加量 ：溶湯重量に対し０．１％添加
合金品種 ：純アルミニウム系としてJIS1100
【００１２】その結果を、表１，２に併記するが、本発
明の要件を満足するフラックスは溶湯中の水素濃度が
０．１５ｃｃ／１００ｇ（Ａｌ）未満に低減できるのが
分かる。またフラックス中の硫酸カリウムの含有量を６
０重量％以上とすれば、該硫酸カリウムと併用される硫
酸リチウムや硫酸マグネシウム、ホウ酸リチウム、炭酸
リチウムの種類や配合量を調整することによりノズル詰
まりの発生も防止できることが分かる。
【００１３】尚、本発明者らは、合金系としてJIS2000,
JIS3000,JIS4000,JIS5000,JIS6000,JIS7000 系等につい
ても、上記JIS1100 系と同様の確認を行い、JIS1100 系
と同じ水素除去結果を得た。またフラックスの吹込みキ
ャリアガスとして、アルゴン、ネオン、ヘリウムガスを
用いた場合も同様であった。更に、溶解炉として誘導溶
解炉を用いた場合も同様の結果を得た。
【００１４】
【表１】
【００１５】
【表２】
【００１６】
【発明の効果】本発明は以上のように構成されており、
ＡｌまたはＡｌ合金中に不純物として存在する水素を
０．１５ｃｃ／１００ｇ（Ａｌ）未満に低減することが
可能な精錬用フラックスが実現できた。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refining flux blown into molten Al or Al alloy.
In particular, the present invention relates to a refining flux capable of reducing hydrogen in molten metal as much as possible. 2. Description of the Related Art Al or an Al alloy (hereinafter sometimes referred to as an Al alloy) is lightweight, has excellent characteristics in terms of moldability, fashionability, and the like. It is used in various fields including sashes. However, when the hydrogen gas concentration in the Al alloy product increases,
It is pointed out that problems such as pinhole defects and processing defects occur on the product surface. It is said that it is extremely difficult to remove hydrogen as an impurity from a molten metal. As a method put to practical use, for example, a method of blowing an inert gas into a molten metal has been proposed as disclosed in Japanese Patent Publication No. 60-45929. However, in this method, since a difference between the hydrogen partial pressure of the inert gas dispersed in the molten metal and the hydrogen partial pressure in the molten metal is used, when a large amount of hydrogen is contained in the Al alloy molten metal, , Not as effective as expected. A method of blowing chlorine gas or chloride flux together with an inert gas is also known. However, the use of chloride-based materials generates harmful chlorine gas, which is problematic in terms of environmental pollution. Further, a flux containing no chloride has been proposed (for example, JP-A-2-270924), but further improvement in performance is desired. SUMMARY OF THE INVENTION [0004] The present invention has been made in view of such circumstances, and its object is to produce Al or Al alloy molten metal without generating harmful chlorine gas or the like. It is an object of the present invention to provide a refining flux capable of minimizing hydrogen contained therein. The present invention, which has achieved the above object, is a refining flux blown into molten Al or Al alloy, wherein the content of K 2 SO 4 is 60 to 99% by weight. And Li 2 SO 4 , Li 2 B 3 O 7 , Li 2 CO
One or two selected from the group consisting of 3 and MgSO 4
It is a flux for refining Al or Al alloy molten metal having a gist in that the content of at least one kind of compound is 1 to 40% by weight. In order to enable the removal of hydrogen present as an impurity in the molten Al alloy, the present inventors react hydrogen with some element or compound to produce a compound containing hydrogen. And then the melting point of Al or Al alloy, 66
It was considered that hydrogen in the molten metal could be removed by gasifying the hydrogen compound at a temperature of about 0 ° C. or removing a solid compound reacted with the hydrogen. As an element that can be used for the reaction of the above compound, the present inventors have considered that potassium and lithium are likely to react with hydrogen to form a compound. That is, it was considered that hydrogen, which is an impurity element, could be removed by bringing a compound containing these elements into contact with a molten metal of Al or an Al alloy. Further, potassium sulfate and lithium borate were mentioned as specific examples of these compounds. The above potassium sulfate, lithium borate, etc.
The melting point of the simple substance is higher than the melting point of Al, and the gas-solid reaction proceeds with respect to the dehydrogenation reaction. Therefore, the inventors studied a means for lowering the melting point of the mixture and bringing it closer to the melting point of Al to form a liquid-liquid reaction, whereby the reaction proceeds more rapidly. As a result, with respect to the scouring agent mainly composed of potassium sulfate, lithium sulfate (Li 2 SO 4 ) or magnesium sulfate (MgSO
It was found that the scouring ability could be improved by mixing 4 ). For the same purpose, lithium carbonate (L
It was also found that the scouring ability was improved by mixing i 2 CO 3 ). These compounds (Li 2 SO 4 , Mg
It has been found that the object of the present invention can be achieved even when SO 4 and Li 2 CO 3 ) are mixed with a flux mainly composed of potassium sulfate and not containing lithium borate. That is, the refining flux of the present invention is mainly composed of K 2 SO 4 and a lithium compound (Li 2 SO 4 , Li 2 B 3 O 7 , Li 2 CO 3 ) and / or a magnesium compound (MgSO 4 ). You only have to include it. However, in the flux of the present invention, if the melting point of the flux is completely lowered to the temperature of the molten aluminum, when the inert gas is blown as a carrier gas by the nozzle, the flux melts at the tip of the nozzle and the nozzle is clogged. The phenomenon is seen. For this reason, scouring is performed and the hydrogen concentration in the molten metal is 0.15 cc / 100 g (A
When the scouring is performed so as to be less than 1), there is a mixed composition range in which the flux can be blown in without causing nozzle clogging (see Examples below). Although the range slightly varies depending on the flux component, the content of K 2 SO 4 is approximately 60 to 99% by weight, and other compounds (Li 2
SO 4 , Li 2 B 3 O 7 , Li 2 CO 3 and MgSO 4
Compound selected from the group consisting of
% By weight. EXAMPLES Refining was performed under the following dissolving conditions using the refining fluxes shown in Tables 1 and 2 below, and the hydrogen concentration in the molten metal was measured and the presence or absence of nozzle clogging was investigated. (Melting conditions) Melting furnace: Reflective melting furnace (LNG only), atmospheric melting temperature: 775 ° C Melt weight: 1 ton Hydrogen initial content: 0.3 cc / 100 g (Al) Refining agent addition method: Inactive for addition Nitrogen gas was added to the molten metal as a carrier gas at a rate of 20 Nl / min. Amount of scouring agent added: 0.1% based on the weight of molten metal Alloy type: JIS1100 based on pure aluminum The results are shown in Tables 1 and 2, and the flux satisfying the requirements of the present invention is It can be seen that the hydrogen concentration can be reduced to less than 0.15 cc / 100 g (Al). In addition, the content of potassium sulfate in the flux was 6
It can be seen that when the content is 0% by weight or more, nozzle clogging can be prevented by adjusting the types and amounts of lithium sulfate, magnesium sulfate, lithium borate, and lithium carbonate used in combination with the potassium sulfate. Incidentally, the present inventors, as an alloy system, JIS2000,
With respect to JIS3000, JIS4000, JIS5000, JIS6000, JIS7000 series, etc., the same confirmation was performed as in the above JIS1100 series, and the same hydrogen removal results as in JIS1100 series were obtained. The same applies when argon, neon, or helium gas is used as the carrier gas for blowing the flux. Further, similar results were obtained when an induction melting furnace was used as the melting furnace. [Table 1] [Table 2] The present invention is configured as described above,
A refining flux capable of reducing hydrogen existing as an impurity in Al or Al alloy to less than 0.15 cc / 100 g (Al) was realized.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大隅 研治 兵庫県神戸市西区高塚台１丁目５番５号 株式会社神戸製鋼所 神戸総合技術研 究所内 (72)発明者 大賀 清正 兵庫県神戸市西区高塚台１丁目５番５号 株式会社神戸製鋼所 神戸総合技術研 究所内 (72)発明者 新井 基浩 兵庫県神戸市西区高塚台１丁目５番５号 株式会社神戸製鋼所 神戸総合技術研 究所内 (72)発明者 益田 穣司 山口県下関市長府港町14番１号 株式会 社神戸製鋼所長府製造所内 (72)発明者 北野 貴之 山口県下関市長府港町14番１号 株式会 社神戸製鋼所長府製造所内 (58)調査した分野(Int.Cl.7，ＤＢ名) C22B 1/00 - 61/00 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Osumi 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Kobe Steel, Ltd. Kobe Research Institute (72) Inventor Kiyomasa Oga, Nishi-ku, Kobe-shi, Hyogo 1-5-5 Takatsukadai Kobe Steel Co., Ltd.Kobe Research Institute (72) Inventor Motohiro Arai 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Kobe Steel Co., Ltd.Kobe Research Institute (72) Inventor Joji Masuda 14-1, Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Inside the Kobe Steel Chofu Mill Co., Ltd. (72) Inventor Takayuki Kitano 14-1, Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Co., Ltd. (58) Field surveyed (Int. Cl. 7 , DB name) C22B 1/00-61/00
Claims (1)
錬用フラックスであって、Ｋ 2 ＳＯ 4 の含有量が６０〜９９重量％であると共に、 Ｌｉ 2 ＳＯ 4 ，Ｌｉ 2 Ｂ 3 Ｏ 7 ，Ｌｉ 2 ＣＯ 3 およびＭｇＳＯ 4
よりなる群から選ばれる１種または２種以上の化合物の
含有量が１〜４０重量％である ことを特徴とするＡｌま
たはＡｌ合金溶湯精錬用フラックス。(1) A refining flux blown into molten Al or Al alloy , wherein the content of K 2 SO 4 is 60 to 99% by weight and the content of Li 2 SO 4 , Li 2 B 3 O 7 , Li 2 CO 3 and MgSO 4
Of one or more compounds selected from the group consisting of
A flux for refining molten Al or Al alloy, the content of which is 1 to 40% by weight .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00328794A JP3428115B2 (en) | 1994-01-17 | 1994-01-17 | Flux for refining Al or Al alloy melt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00328794A JP3428115B2 (en) | 1994-01-17 | 1994-01-17 | Flux for refining Al or Al alloy melt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07207358A JPH07207358A (en) | 1995-08-08 |
| JP3428115B2 true JP3428115B2 (en) | 2003-07-22 |
Family
ID=11553192
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00328794A Expired - Fee Related JP3428115B2 (en) | 1994-01-17 | 1994-01-17 | Flux for refining Al or Al alloy melt |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3428115B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU9280198A (en) * | 1998-09-30 | 2000-04-17 | Aikoh Flux Co., Ltd. | Flux for molten aluminum and aluminum alloy |
| JP3668081B2 (en) | 1998-12-25 | 2005-07-06 | 株式会社神戸製鋼所 | Method for refining molten aluminum alloy and flux for refining molten aluminum alloy |
| CN117802364A (en) * | 2024-01-08 | 2024-04-02 | 广东工程职业技术学院 | High-strength high-plasticity extrusion casting aluminum alloy and preparation method thereof |
-
1994
- 1994-01-17 JP JP00328794A patent/JP3428115B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07207358A (en) | 1995-08-08 |
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