JPH07207372A - Production of al or al alloy - Google Patents
Production of al or al alloyInfo
- Publication number
- JPH07207372A JPH07207372A JP327794A JP327794A JPH07207372A JP H07207372 A JPH07207372 A JP H07207372A JP 327794 A JP327794 A JP 327794A JP 327794 A JP327794 A JP 327794A JP H07207372 A JPH07207372 A JP H07207372A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- molten metal
- molten
- present
- intermetallic compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 15
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 22
- 229910000765 intermetallic Inorganic materials 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 10
- 239000011261 inert gas Substances 0.000 claims description 4
- 239000012159 carrier gas Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052745 lead Inorganic materials 0.000 abstract description 9
- 229910052718 tin Inorganic materials 0.000 abstract description 7
- 239000011575 calcium Substances 0.000 description 22
- 238000000034 method Methods 0.000 description 10
- 238000001914 filtration Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- -1 carbide Chemical compound 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ＡｌまたはＡｌ合金を
製造する方法に関し、詳細にはＡｌまたはＡｌ合金溶湯
から不純物であるＰｂ、Ｓｎを除去する方法に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing Al or Al alloy, and more particularly to a method for removing impurities Pb and Sn from molten Al or Al alloy.
【０００２】[0002]
【従来の技術】ＡｌまたはＡｌ合金は、軽量性、加工
性、表面美麗性等の特徴を有することから種々の用途に
利用されている。しかし、不純物元素の混入によって、
共晶化合物が粗大化する等の不都合が生じ、強度、靭
性、表面処理性等が著しく劣るという問題がある。従っ
て、不純物元素を極力低減しなければならない。2. Description of the Related Art Al or Al alloys are used for various purposes because they have characteristics such as light weight, workability and surface beauty. However, due to the inclusion of impurity elements,
There is a problem that the eutectic compound becomes coarse, and the strength, toughness, surface treatability, etc. are significantly deteriorated. Therefore, the impurity element must be reduced as much as possible.
【０００３】不純物のなかでもＰｂについては、特開平
５−１７８５６号に、純Ａｌ板材を所定温度に加熱保持
しＰｂやＳｎを板表面に拡散移動させ、この表面部を除
去する方法が提案されているが、根本的な不純物除去方
法とは言えず、また溶湯における偏析法によってもＰｂ
の除去は可能であるが効率が悪く工業的ではない。この
様にＡｌまたはＡｌ合金中のＰｂまたはＳｎを、安価で
かつ生産性良好に除去し得る方法はまだ得られていない
のが現状である。Regarding Pb among impurities, JP-A-5-17856 proposes a method in which a pure Al plate material is heated and maintained at a predetermined temperature to diffuse and move Pb and Sn to the plate surface and remove the surface portion. However, it cannot be said that it is a fundamental method for removing impurities, and that Pb can also be detected by the segregation method in molten metal
Can be removed, but it is not efficient and not industrial. As described above, at present, a method that can remove Pb or Sn in Al or an Al alloy at low cost and with good productivity has not yet been obtained.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記従来技
術の問題を解決し、ＡｌまたはＡｌ合金溶湯中からＰｂ
またはＳｎを、安価でしかも生産性良好に除去し得る方
法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and removes Pb from Al or Al alloy molten metal.
Another object of the present invention is to provide a method capable of removing Sn at low cost and with good productivity.
【０００５】[0005]
【課題を解決するための手段】本発明のＡｌまたはＡｌ
合金の製造方法は、不純物としてＰｂおよび／またはＳ
ｎを含むＡｌまたはＡｌ合金溶湯中に、ＢａもしくはＣ
ａ、またはこれらの元素を含む化合物１種以上を添加し
て、前記不純物元素とＢａもしくはＣａとの金属間化合
物を形成させてこれを分離する工程を含むところに要旨
を有する。不活性ガスをキャリアガスとしてノズルか
ら、前記添加元素もしくは化合物を吹き込むこと、金属
間化合物を耐火性フィルターを介して除去することは本
発明の好ましい実施態様である。Means for Solving the Problems Al or Al of the present invention
The method for producing the alloy is such that Pb and / or S as impurities.
In molten Al or Al alloy containing n, Ba or C
The gist is that it includes the step of adding a or one or more compounds containing these elements to form an intermetallic compound of the impurity element and Ba or Ca and separating the intermetallic compound. Blowing the additive element or compound from a nozzle using an inert gas as a carrier gas and removing the intermetallic compound through a refractory filter are preferred embodiments of the present invention.
【０００６】[0006]
【作用】ＡｌまたはＡｌ溶湯中のＰｂやＳｎはＡｌより
も酸化しにくいため、通常用いられている酸化法によっ
て除去することはできない。しかし本発明者らが鋭意検
討した結果、ＰｂおよびＳｎは、Ｂａ、Ｃａとの間に容
易に金属間化合物を形成し、Ａｌ溶湯中に晶析もしくは
半溶融状態で存在し、ろ過によってメタルロスなしに分
離除去し得ることを見出し本発明に到達した。Function: Al or Pb or Sn in the molten Al is less likely to be oxidized than Al, and therefore cannot be removed by a commonly used oxidation method. However, as a result of intensive studies by the present inventors, Pb and Sn easily form an intermetallic compound with Ba and Ca, exist in the molten Al in a crystallization or semi-molten state, and have no metal loss by filtration. The present invention has been achieved by finding that they can be separated and removed.
【０００７】本発明では、Ｂａ、Ｃａは単体金属のま
ま、またはシリカ物、炭化物、弗化物、硼化物、塩化
物、硫化物等の化合物の形で添加することができる。添
加量は、ＡｌまたはＡｌ合金溶湯中に含まれるＰｂおよ
び／またはＳｎの量に応じて、その存在量を増減させる
必要がある。後述の実施例による実験結果（図１参照）
から、Ｃａ量は、溶湯中のＰｂ１に対して重量比で０．
５〜２が好ましいことがわかった。添加量の上限値は、
ＡｌのＪＩＳ規定によってＰｂ０．５重量％以下と決め
られているので実験結果から、Ｐｂ１に対してＣａの重
量比で２とした。Ｃａが０．５より少ないと、不純物Ｐ
ｂの残存量が増え、２を超えるとＣａの残存により溶湯
が汚染される。またＢａ量は、１．７〜６．９が好まし
い範囲であった。In the present invention, Ba and Ca can be added as elemental metals or in the form of compounds such as silica, carbide, fluoride, boride, chloride and sulfide. It is necessary to increase or decrease the amount of Pb and / or Sn contained in the molten Al or Al alloy melt. Experimental results according to examples described later (see FIG. 1)
Therefore, the amount of Ca was 0.1% by weight with respect to Pb1 in the molten metal.
It has been found that 5 to 2 is preferable. The upper limit of the added amount is
Since Pb is 0.5% by weight or less according to JIS standard of Al, the weight ratio of Ca to Pb1 is set to 2 from the experimental result. If Ca is less than 0.5, the impurity P
When the residual amount of b increases and exceeds 2, the molten metal is contaminated by the residual Ca. The preferable amount of Ba is 1.7 to 6.9.
【０００８】理論的な下限値は、金属間化合物を形成し
得る化学量論的当量であるが、例えばＣａとＰｂに関し
て考えると、ＣａとＰｂとの間には、ＣａＰｂ、または
Ｃａ 2 Ｐｂの２種の金属間化合物が形成されるため、化
学量論的当量を定めにくい。ＣａＰｂの生成自由エネル
ギーは６６０℃で約−９０ｋＪ／ｍｏｌＰｂであり、Ｃ
ａ2 Ｐｂの生成自由エネルギーは６６０℃で約−１７０
ｋＪ／ｍｏｌＰｂである。従って、ＣａＰｂよりもＣａ
2 Ｐｂが生成し易いと考えると、Ｃａ：Ｐｂ＝２：１が
化学量論的当量となり、溶湯中のＰｂ１モルに対しＣａ
は２モル以上存在させることが好ましいことになる。重
量比としては、Ｃａ：Ｐｂ＝８０：２０７となり、大体
実験値と一致している。また不純物Ｓｎを除去する場合
は、Ｂａが０．９７〜４．０、Ｃａが０．２９〜１．１
５（それぞれ対Ｓｎ１の重量比）が好ましい範囲であっ
た。The theoretical lower limit is the formation of intermetallic compounds.
The stoichiometric equivalent to obtain, for example for Ca and Pb
Considering that, between Ca and Pb, CaPb, or
Ca 2 Since two kinds of intermetallic compounds of Pb are formed,
It is difficult to determine the stoichiometric equivalent. Free energy generation of CaPb
Gee is about -90 kJ / mol Pb at 660 ° C. and C
a2 Free energy of formation of Pb is about -170 at 660 ° C.
It is kJ / molPb. Therefore, Ca rather than CaPb
2 Considering that Pb is easily generated, Ca: Pb = 2: 1
Stoichiometric equivalent, Ca for 1 mol of Pb in the melt
Would preferably be present in an amount of 2 mol or more. Heavy
The quantitative ratio is Ca: Pb = 80: 207, which is roughly
It agrees with the experimental value. When removing the impurity Sn
Has a Ba of 0.97 to 4.0 and a Ca of 0.29 to 1.1.
5 (each weight ratio of Sn1 to Sn1) is a preferable range.
It was
【０００９】本発明では、Ｂａ、Ｃａ、あるいはこれら
の元素を含む化合物を直接溶解炉へ添加したり、または
不活性ガスと共にノズルから溶湯中へ吹込む方法によっ
て添加することができる。これらの単体金属や化合物
を、窒素、アルゴン、Ｈｅ、ネオン等の不活性ガスに混
入させて、微細な気泡状に溶湯中に吹込む方法を採用す
れば、溶湯中に浮遊している金属間化合物が気泡の浮上
と共に浮上して取り除き易くなる効果も有する。また、
脱水素も同時に達成することができる。In the present invention, Ba, Ca, or a compound containing these elements can be added directly to the melting furnace, or can be added by a method of blowing together with an inert gas into the molten metal from a nozzle. If these single metals or compounds are mixed with an inert gas such as nitrogen, argon, He, or neon, and blown into the molten metal in the form of fine bubbles, the metal floating in the molten metal It also has the effect that the compound floats with the floating of the bubbles and is easy to remove. Also,
Dehydrogenation can also be achieved at the same time.
【００１０】本発明では、金属間化合物が晶析したＡｌ
またはＡｌ合金溶湯中から、これらの金属間化合物を分
離することによって、不純物Ｐｂの除去が達成できる。
金属間化合物の除去方法は特に限定されない。金属間化
合物はＡｌまたはＡｌ合金より重いと考えられ、「溶湯
鎮静」として溶湯を静置して金属間化合物を沈降させた
後、耐火性の多孔体フィルターで溶湯濾過する等の方法
で除去することが好ましい。ＡｌまたはＡｌ合金は通常
の溶解温度７００〜９００℃で溶解し、溶湯中に金属間
化合物を形成させて濾過した後は、公知の方法で精錬を
行うことによって、高純度なＡｌまたはＡｌ合金を製造
することができる。In the present invention, Al crystallized from an intermetallic compound is used.
Alternatively, the impurities Pb can be removed by separating these intermetallic compounds from the molten Al alloy.
The method for removing the intermetallic compound is not particularly limited. It is considered that the intermetallic compound is heavier than Al or Al alloy, and is removed by a method such as "melting the metal" by allowing the molten metal to stand and allowing the intermetallic compound to settle, and then filtering the molten metal with a refractory porous filter. It is preferable. Al or Al alloy is melted at a normal melting temperature of 700 to 900 ° C., and after forming an intermetallic compound in the molten metal and filtering, it is refined by a known method to obtain high purity Al or Al alloy It can be manufactured.
【００１１】[0011]
【実施例】以下実施例によって本発明をさらに詳述する
が、下記実施例は本発明を制限するものではなく、前・
後記の趣旨を逸脱しない範囲で変更実施することは全て
本発明の技術範囲に包含される。原料として、Ｐｂを
０．２重量％含むＪＩＳ１１００系Ａｌスクラップ（Ｎ
ｏ．１）、Ｐｂを０．５重量％含むＡｌスクラップ（Ｎ
ｏ．２）、Ｐｂを１．０重量％含むＡｌスクラップ（Ｎ
ｏ．３）を用いて、１０トンの反射型溶解炉（ＬＮＧ炊
き）を用い、７５０℃で大気溶解した。金属カルシウム
を溶湯に直接添加し、添加量調整のため、窒素ガスに金
属カルシウムを加え、１０Ｎリットル／分で溶湯に吹き
込んだ。サンプリングした溶湯からフィルターで濾過し
た後のサンプルについて元素分析を行い、溶湯中のＰｂ
濃度とＣａ濃度を求め図１に示した。初期Ｐｂ重量％に
対して０．５〜２倍のＣａ量のときに溶湯を汚染するこ
となく良好にＰｂを除去できることが分かった。The present invention will be described in more detail with reference to the following examples, but the following examples do not limit the present invention.
All modifications and implementations that do not depart from the spirit of the description below are included in the technical scope of the present invention. As a raw material, JIS 1100 series Al scrap containing 0.2% by weight of Pb (N
o. 1), Al scrap containing 0.5% by weight of Pb (N
o. 2), Al scrap containing 1.0% by weight of Pb (N
o. Using 3), a 10 ton reflective melting furnace (LNG cook) was used to melt in air at 750 ° C. Metallic calcium was added directly to the molten metal, and in order to adjust the amount added, metallic calcium was added to nitrogen gas and blown into the molten metal at 10 Nl / min. Elemental analysis was performed on the sample obtained by filtering the sampled molten metal with a filter, and Pb in the molten metal was analyzed.
The concentration and Ca concentration were determined and shown in FIG. It was found that Pb can be satisfactorily removed without contaminating the molten metal when the Ca content is 0.5 to 2 times the initial Pb weight%.
【００１２】[0012]
【発明の効果】本発明は以上の様に構成されており、Ａ
ｌまたはＡｌ合金中の不純物Ｐｂ、Ｓｎを安価にかつ効
率よく除去することができ、高純度なＡｌ、Ａｌ合金を
製造することができた。The present invention is constituted as described above, and A
The impurities Pb and Sn in 1 or Al alloy could be removed efficiently at low cost, and high purity Al and Al alloy could be manufactured.
【図１】Ｃａ処理したときの溶湯中のＰｂ濃度とＣａ濃
度を示したグラフである。FIG. 1 is a graph showing a Pb concentration and a Ca concentration in a molten metal when treated with Ca.
───────────────────────────────────────────────────── フロントページの続き (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 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kiyomasa Oga 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Prefecture Kobe Steel Research Institute, Kobe Steel Co., Ltd. (72) Inventor Motohiro Arai Takatsuka, Nishi-ku, Kobe-shi, Hyogo Prefecture No. 1-5-5 Kobe Steel Works, Ltd., Kobe Research Institute (72) Inventor Minji Masuda 14-1, Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Kobe Steel Co., Ltd., Chofu Factory (72) Inventor Takayuki Kitano Yamaguchi 14-1 Chofu Minatomachi, Shimonoseki City, Shizuoka Prefecture Kobe Steel Co., Ltd. Chofu Works
Claims (3)
含むＡｌまたはＡｌ合金溶湯中に、ＢａもしくはＣａ、
またはこれらの元素を１種以上含む化合物を添加して、
前記不純物元素とＢａもしくはＣａとの金属間化合物を
形成させてこれを分離する工程を含むことを特徴とする
ＡｌまたはＡｌ合金の製造方法。1. Ba or Ca in an Al or Al alloy molten metal containing Pb and / or Sn as impurities.
Or by adding a compound containing one or more of these elements,
A method for producing Al or an Al alloy, comprising a step of forming an intermetallic compound of the impurity element and Ba or Ca and separating the intermetallic compound.
ルからＢａもしくはＣａ、またはこれらの元素を含む化
合物１種以上吹込むものである請求項１に記載の製造方
法。2. The production method according to claim 1, wherein at least one compound containing Ba or Ca or a compound containing these elements is blown from a nozzle using an inert gas as a carrier gas.
物を、耐火性フィルターを介して除去するものである請
求項１または２に記載の製造方法。3. The production method according to claim 1, wherein the intermetallic compound in the molten aluminum or aluminum alloy is removed through a refractory filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP327794A JPH07207372A (en) | 1994-01-17 | 1994-01-17 | Production of al or al alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP327794A JPH07207372A (en) | 1994-01-17 | 1994-01-17 | Production of al or al alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07207372A true JPH07207372A (en) | 1995-08-08 |
Family
ID=11552943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP327794A Withdrawn JPH07207372A (en) | 1994-01-17 | 1994-01-17 | Production of al or al alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07207372A (en) |
-
1994
- 1994-01-17 JP JP327794A patent/JPH07207372A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010403 |