JP3379232B2 - Dissolution method of Al or Al alloy - Google Patents
Dissolution method of Al or Al alloyInfo
- Publication number
- JP3379232B2 JP3379232B2 JP20103794A JP20103794A JP3379232B2 JP 3379232 B2 JP3379232 B2 JP 3379232B2 JP 20103794 A JP20103794 A JP 20103794A JP 20103794 A JP20103794 A JP 20103794A JP 3379232 B2 JP3379232 B2 JP 3379232B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- amount
- molten metal
- molten
- complex oxide
- 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
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 33
- 229910052782 aluminium Inorganic materials 0.000 title claims description 30
- 238000011978 dissolution method Methods 0.000 title 1
- 229910052751 metal Inorganic materials 0.000 claims description 36
- 239000002184 metal Substances 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 24
- 239000012535 impurity Substances 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 15
- 238000002844 melting Methods 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 11
- 229910006339 Si—Pb Inorganic materials 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 claims description 2
- 238000007667 floating Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 238000000921 elemental analysis Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 239000000203 mixture 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
- 238000010587 phase diagram Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【産業上の利用分野】本発明はＡｌまたはＡｌ合金の溶
解法に関し、特にＡｌまたはＡｌ合金溶湯中に含まれる
不純物であるＳｉを溶解段階で効率よく除去して清浄度
の高いＡｌまたはＡｌ合金を得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 melting Al or Al alloy, and more particularly to Al or Al alloy having high cleanliness by efficiently removing Si, which is an impurity contained in molten Al or Al alloy, in the melting stage. Is about how to get.
【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、
表面処理性等に悪影響を与えるという問題がある。近
年、省資源・省エネルギーの観点から、ＡｌまたはＡｌ
合金製品のリサイクルが必要とされているが、不純物元
素を極力低減しなければリサイクルによって得られるＡ
ｌまたはＡｌ合金が使用に耐えないものとなってしま
う。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, the inclusion of impurity elements causes problems such as coarsening of the eutectic compound, resulting in strength, toughness,
There is a problem that the surface treatability is adversely affected. In recent years, from the viewpoint of resource saving and energy saving, Al or Al
Although it is necessary to recycle alloy products, A can be obtained by recycling unless impurity elements are reduced as much as possible.
l or Al alloy becomes unusable.
【０００３】この様なところから、ＡｌまたはＡｌ合金
からの不純物元素の除去法については様々の研究が行な
われており、その一部は実用化されている。種々の不純
物元素のうちＳｉに注目すると、例えば特公平１−２７
９７１２号公報には、状態図から見てＡｌまたはＡｌ合
金溶湯が凝固する際にＡｌ純度の高い部分が先に凝固す
るという原理を利用し、溶湯中のＳｉを凝固末期の未凝
固溶湯中に濃縮して除去する方法（偏析法）が提案され
ているが、この方法は大量処理に不向きであって生産性
が低く、しかも多量のＡｌロスが避けられないという問
題があり、工業的規模での実用性を欠く。また特公昭６
２−１０３１５号公報には、電気分解法によってＳｉを
除去する方法も提案されているが、この方法は処理コス
トが非常に高くやはり工業的規模での実用性を欠く。From such a point, various studies have been conducted on a method of removing an impurity element from Al or an Al alloy, and a part of them has been put into practical use. Focusing on Si among various impurity elements, for example, Japanese Patent Publication No. 1-27
No. 9712 utilizes the principle that when Al or Al alloy molten metal is solidified from the phase diagram, a portion having high Al purity is solidified first, and Si in the molten metal is converted into unsolidified molten metal at the final stage of solidification. A method of concentrating and removing (segregation method) has been proposed, but this method is not suitable for large-scale processing and has low productivity, and there is a problem that a large amount of Al loss is unavoidable, so that it is industrially scaled. Lacks the practicality of. See also Shokoku 6
Japanese Patent Laid-Open No. 2-10315 also proposes a method of removing Si by an electrolysis method, but this method has a very high processing cost and also lacks practicability on an industrial scale.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、上記の様な
事情に着目してなされたものであって、その目的は、Ａ
ｌまたはＡｌ合金溶湯中から不純物元素であるＳｉを低
コストで効率よく除去することのできる方法を確立し、
高純度なＡｌまたはＡｌ合金を得ることのできる方法を
提供しようとするものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its purpose is to
l or a method capable of efficiently removing the impurity element Si from the molten Al alloy at low cost,
It is intended to provide a method capable of obtaining high-purity Al or Al alloy.
【０００５】[0005]
【課題を解決するための手段】上記課題を達成すること
のできた本発明に係るＡｌまたはＡｌ合金の溶解法の構
成は、不純物としてＳｉを含むＡｌまたはＡｌ合金溶湯
中に、Ｐｂおよび／またはＰｂ含有化合物を添加し、Ｓ
ｉとの間でＳｉ−Ｐｂ系複合酸化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。尚この方法
を実施するに当たっては、該複合酸化物の形成されたＡ
ｌまたはＡｌ合金溶湯中に、不活性ガスを吹込んで溶湯
中の該複合酸化物の浮上分離を促進する方法、あるいは
該複合酸化物を耐火性フィルターを介して除去する方法
等が好ましい方法として採用される。The composition of the Al or Al alloy melting method according to the present invention, which has been able to achieve the above object, is Pb and / or Pb in an Al or Al alloy molten metal containing Si as an impurity. Add the compound containing S
The gist is that it includes a step of forming a Si-Pb-based complex oxide with i and separating it. In carrying out this method, the A
1 or a method of blowing an inert gas into the molten Al alloy to promote floating separation of the complex oxide in the molten metal, or a method of removing the complex oxide through a refractory filter, etc. are adopted as preferable methods. To be done.
【０００６】[0006]
【作用】ＡｌまたはＡｌ合金は極めて酸化し易く、かつ
その酸化傾向はＳｉより大きい。従って、ＡｌまたはＡ
ｌ合金溶湯からＳｉを酸化物として除去することは不可
能であることが知られている。しかし、本発明者らが鋭
意検討した結果、ＳｉとＰｂとの複合酸化物は、Ａｌま
たはＡｌ合金溶湯中に固形の晶出物もしくは半溶融状態
で存在し、ろ過によって比較的簡単に分離除去し得るこ
とを見出し本発明に到達した。これは、Ｓｉ−Ｐｂ−Ｏ
系複合酸化物が、Ａｌの酸化物であるＡｌ 2 Ｏ3 よりも
生成自由エネルギーが低いためであると考えられる。こ
のことから本発明では、不純物としてＳｉを含むＡｌま
たはＡｌ合金溶湯中にＰｂと酸素源を存在させ、Ｓｉと
の複合酸化物を形成させてこれを除去することとしたの
である。[Function] Al or Al alloy is extremely easy to oxidize, and
Its oxidation tendency is larger than that of Si. Therefore, Al or A
It is impossible to remove Si as an oxide from molten alloy.
It is known to be Noh. However, the present inventors
As a result of a careful examination, the composite oxide of Si and Pb was Al or Al.
Or solid crystallized substances or semi-molten state in molten Al alloy
And can be separated and removed relatively easily by filtration.
And has reached the present invention. This is Si-Pb-O
Al-based complex oxide is an oxide of Al 2 O3 than
It is considered that this is because the free energy of formation is low. This
Therefore, in the present invention, Al containing Si as an impurity is used.
Or Pb and oxygen source in the molten Al alloy,
I decided to form a complex oxide and remove it.
Is.
【０００７】本発明では、ＡｌまたはＡｌ合金溶湯中
に、Ｐｂおよび／またはＰｂ含有化合物を添加するが、
用いることのできるＰｂ含有化合物としてはＰｂを含む
ものであればよく、例えばＰｂＯ2 、ＭｇＰｂＯ3 、Ｃ
ａＰｂＯ3 、ＦｅＰｂＯ3 、ＭｎＰｂＯ3 、ＺｎＰｂＯ
3 等が挙げられる。尚Ｐｂを金属元素として添加する場
合は、処理系に酸素源を供給することが必要であり、そ
の手段として最も簡単なのは、溶解を大気雰囲気中で行
なうことにより大気から酸素を供給する方法であるが、
勿論この方法に限られるものではなく、例えば酸素含有
ガスを溶湯内へ吹き込んで溶湯の攪拌と酸素源の供給を
同時に行うことも有効である。しかし、酸素含有ガスを
溶湯内へ吹き込む方法を採用すると、ＡｌまたはＡｌ合
金の酸化ロスが増大する傾向があるので、好ましくは大
気溶解とＰｂ酸化物の併用を採用するのが好ましい。In the present invention, Pb and / or a Pb-containing compound is added to the molten aluminum or aluminum alloy.
As the Pb-containing compound that can be used, any compound containing Pb may be used. For example, PbO 2 , MgPbO 3 , C
aPbO 3 , FePbO 3 , MnPbO 3 , ZnPbO
3 etc. When Pb is added as a metal element, it is necessary to supply an oxygen source to the treatment system, and the simplest means is to supply oxygen from the atmosphere by performing melting in the atmosphere. But,
Of course, the method is not limited to this. For example, it is also effective to blow an oxygen-containing gas into the molten metal to simultaneously stir the molten metal and supply the oxygen source. However, when the method of blowing the oxygen-containing gas into the molten metal is adopted, the oxidation loss of Al or Al alloy tends to increase, so it is preferable to use the combination of atmospheric dissolution and Pb oxide.
【０００８】Ｐｂおよび／またはＰｂ含有化合物の添加
量は、溶湯中に混入している不純物Ｓｉの量に応じて増
減させる必要がある。これら化合物中のＰｂ総量の下限
値は、Ｓｉ−Ｐｂ系複合酸化物を形成し得る化学量論的
当量であり、当量より少ないと、不純物Ｓｉの全てを複
合酸化物として除去できなくなる。例えば、ＰｂＯ2の
みを添加して、（ＰｂＯ）（ＳｉＯ2）3を形成させる場
合、Ｓｉの１モルに対しＰｂは１／３モル（化学量論的
当量）必要であり、重量比としてはＳｉ：Ｐｂ＝２８．
１：６９（１／３モル：ＰｂＯ2としては７９．６）と
なる。従ってＳｉが１質量％含まれる溶湯には、ＰｂＯ
2を２．８６重量％以上添加すればよいことになる。た
だし、複合酸化物形成のための反応の場が少ないことを
考慮すれば、当量の１．５倍以上のＰｂを存在させるこ
とが好ましい。The amount of Pb and / or Pb-containing compound added must be increased or decreased in accordance with the amount of impurity Si mixed in the molten metal. The lower limit of the total amount of Pb in these compounds is a stoichiometric equivalent amount capable of forming a Si-Pb-based complex oxide, and if it is less than the equivalent amount, all the impurities Si cannot be removed as a complex oxide. For example, when only PbO 2 is added to form (PbO) (SiO 2 ) 3 , 1 mole of Si requires 1/3 mole of Pb (stoichiometric equivalent), and the weight ratio is Si: Pb = 28.
The ratio is 1:69 (1/3 mol: 79.6 as PbO 2 ). Therefore, PbO is contained in the molten metal containing 1% by mass of Si.
It is sufficient to add 2.86% by weight or more of 2 . However, considering that there are few reaction fields for forming the complex oxide, it is preferable to allow 1.5 times or more equivalent amount of Pb to be present.
【０００９】一方、Ｐｂは溶湯中のＳｉ量より過度に多
く存在させると、却って溶湯汚染の原因となり、得られ
るＡｌまたはＡｌ合金の性能低下につながりかねない。
従って、Ｐｂの上限値は、複合酸化物を形成し得る化学
量論的当量の３倍程度とすることが好ましい。より好ま
しくは当量の２倍以下である。また、必要に応じて酸素
源として空気吹込みを行なうことも可能であるが、この
場合は、余剰酸素によるＡｌ2 Ｏ3 の生成によってＡｌ
ロスが増大しない様に吹込み量を調整することが望まれ
る。On the other hand, if Pb is present in an excessively larger amount than the amount of Si in the molten metal, it may rather cause contamination of the molten metal, leading to deterioration in the performance of the obtained Al or Al alloy.
Therefore, the upper limit of Pb is preferably about 3 times the stoichiometric equivalent capable of forming a composite oxide. More preferably, it is not more than twice the equivalent amount. It is also possible to blow air as an oxygen source if necessary, but in this case, Al 2 O 3 is generated by the excess oxygen to generate Al 2.
It is desirable to adjust the blowing amount so that the loss does not increase.
【００１０】本発明では、ＳｉとＰｂの複合酸化物が生
成したＡｌまたはＡｌ合金溶湯中から、これらの複合酸
化物を分離することによって、不純物Ｓｉの除去が達成
できる。複合酸化物の除去方法は特に限定されないが、
一般的な方法としては、「溶湯鎮静」として溶湯を静置
し複合酸化物を浮上・もしくは沈降させてから除滓する
方法、或は溶湯を耐火性多孔質フィルターに通して複合
酸化物を濾別する方法等が例示される。また、生成する
複合酸化物は溶湯中に浮遊しているものも多いため、窒
素、アルゴン、Ｈｅ、ネオン等の不活性ガスを微細な気
泡状に溶湯中に吹込み、気泡の浮上と共に該複合酸化物
を浮上させて除滓する等も好ましい方法の１つであり、
この方法を採用すれば同時に脱水素も進められるという
利点を享受できる。In the present invention, the impurity Si can be removed by separating these complex oxides from the molten Al or Al alloy melt in which the complex oxides of Si and Pb are formed. The method for removing the complex oxide is not particularly limited,
As a general method, as the "molten metal quenching", the molten metal is allowed to stand and the composite oxide is floated or settled and then removed, or the molten metal is filtered through a refractory porous filter. Examples of different methods are given. In addition, since many of the complex oxides produced are suspended in the molten metal, an inert gas such as nitrogen, argon, He, or neon is blown into the molten metal in the form of fine bubbles, and when the bubbles float, One of the preferable methods is to float the oxide and remove it.
If this method is adopted, the advantage that dehydrogenation can be promoted at the same time can be enjoyed.
【００１１】本発明におけるＡｌまたはＡｌ合金の溶解
温度としては、通常の７００〜９００℃でよく、複合酸
化物を形成させて該複合酸化物を除去した後は、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Ａ
ｌ合金を製造することができる。The melting temperature of Al or Al alloy in the present invention may be a usual temperature of 700 to 900 ° C. After forming the complex oxide and removing the complex oxide, refining is performed by a known method. Depending on the high purity Al or A
l alloys can be produced.
【００１２】[0012]
【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。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.
【００１３】実施例１
原料として、Ｓｉ：１．０重量％を含むＪＩＳの１１０
０の純Ａｌ系スクラップを使用し、溶解温度：７２０
℃、溶解炉：１０トンの反射型溶解炉（重油焚き）で大
気溶解する方法を採用し、このとき、ＰｂまたはＰｂ含
有化合物を所定量添加（Ｎ2 ガスによって吹き込み）し
た後、生成するＳｉ−Ｐｂ系複合酸化物を浮上分離によ
って除去した後、溶湯をサンプリングして元素分析を行
なった。溶湯は引き続いて精錬（ＫＣｌ系フラックス：
溶湯量に対し０．１重量％をＮ2 ガス：流量０．６ｍ3
／ｈ、３０分で吹き込み）を行なった後、半連続鋳造を
行ない、直径３００ｍｍのビレット（４本取り）を製造
した。上記処理段階でサンプリングした溶湯の元素分析
を行ない、Ｓｉ残留濃度が２００ｐｐｍ以下、Ｐｂ残留
濃度が２０ｐｐｍ以下のものを合格とした。結果を表１
に示す。Example 1 As a raw material, JIS 110 containing Si: 1.0% by weight was used.
Using pure Al-based scrap of 0, melting temperature: 720
C., melting furnace: a method of melting in the atmosphere in a reflection type melting furnace (heavy oil burning) of 10 tons is adopted, and at this time, a predetermined amount of Pb or a Pb-containing compound is added (blown with N 2 gas) and then Si is generated. After removing the —Pb-based composite oxide by levitation separation, the molten metal was sampled for elemental analysis. The molten metal is subsequently refined (KCl-based flux:
0.1% by weight relative to the amount of molten metal is N 2 gas: flow rate is 0.6 m 3
/ H for 30 minutes), and then semi-continuous casting was performed to manufacture a billet (4 pieces) having a diameter of 300 mm. Elemental analysis of the molten metal sampled in the above treatment step was performed, and those having a Si residual concentration of 200 ppm or less and a Pb residual concentration of 20 ppm or less were accepted. The results are shown in Table 1.
Shown in.
【００１４】[0014]
【表１】 [Table 1]
【００１５】実施例２
原料として、Ｓｉ：３．０重量％を含むＪＩＳ−４００
０のＡｌ合金系スクラップを使用し、溶解温度：７２０
℃、溶解炉：１０トンの反射型溶解炉（重油焚き）で大
気溶解する方法を採用し、このとき、ＰｂまたはＰｂ含
有化合物を所定量添加（Ｎ2 ガスによって吹き込み）し
た後、生成するＳｉ−Ｐｂ系複合酸化物をフィルター濾
過によって除去した後、溶湯をサンプリングして元素分
析を行なった。溶湯は引き続いて精錬（Ａｒガスを流量
０．６ｍ3 ／ｈで３０分で吹き込み）を行なった後、半
連続鋳造を行ない、直径３００ｍｍのビレット（４本取
り）を製造した。上記処理段階でサンプリングした溶湯
の元素分析を行ない、Ｓｉ残留濃度が２００ｐｐｍ以
下、Ｐｂ残留濃度が２０ｐｐｍ以下のものを合格とし
た。結果を表２に示す。Example 2 JIS-400 containing 3.0% by weight of Si as a raw material
Al alloy scrap of 0 is used, melting temperature: 720
C., melting furnace: a method of melting in the atmosphere in a reflection type melting furnace (heavy oil burning) of 10 tons is adopted, and at this time, a predetermined amount of Pb or a Pb-containing compound is added (blown with N 2 gas) and then Si is generated. After removing the -Pb-based complex oxide by filter filtration, the molten metal was sampled and subjected to elemental analysis. The molten metal was subsequently subjected to refining (Ar gas was blown at a flow rate of 0.6 m 3 / h for 30 minutes), and then semi-continuous casting was carried out to manufacture a billet having a diameter of 300 mm (4 pieces). Elemental analysis of the molten metal sampled in the above treatment step was performed, and those having a Si residual concentration of 200 ppm or less and a Pb residual concentration of 20 ppm or less were accepted. The results are shown in Table 2.
【００１６】[0016]
【表２】 [Table 2]
【００１７】表１，２からも明らかである様に、Ａｌま
たはＡｌ合金溶湯中に適量のＰｂまたはＰｂ含有化合物
を添加して処理すると、該溶湯中に不純物元素として含
まれるＳｉが効率よく除去され、清浄度の高いＡｌまた
はＡｌ合金を得ることができる。As is clear from Tables 1 and 2, when an appropriate amount of Pb or a Pb-containing compound is added to an Al or Al alloy molten metal for treatment, Si contained as an impurity element in the molten metal is efficiently removed. Thus, Al or Al alloy having high cleanliness can be obtained.
【００１８】尚、図１は、ＡｌまたはＡｌ合金溶湯中に
含まれるＳｉ量に対する添加Ｐｂ量とＳｉ−Ｐｂ系複合
酸化物生成量の関係を整理して示したグラフであり、こ
のグラフからも明らかである様に、Ｓｉ量に対して当モ
ル量よりもやや多め（約１．２倍モル）のＰｂを添加す
ることによって、Ｓｉを効率よく除去し得ること、ま
た、それ以上にＰｂ添加量を多くしてもそれ以上にＳｉ
−Ｐｂ系複合酸化物の増大は見られず、余剰のＰｂは当
該溶湯に不純物として混入することになるため、それ以
上の添加は余り好ましくないことが分かる。FIG. 1 is a graph showing the relationship between the amount of added Pb and the amount of Si-Pb-based complex oxide produced with respect to the amount of Si contained in Al or Al alloy molten metal. As is clear, it is possible to efficiently remove Si by adding a slightly larger amount (about 1.2 times mol) of Pb than the equimolar amount to the Si amount, and to add more Pb than that. Even if the amount is increased, it is more Si
It can be seen that no increase in the amount of -Pb-based composite oxide is observed and the excess Pb is mixed as an impurity in the molten metal, so that further addition is not very preferable.
【００１９】また図２は、ＡｌまたはＡｌ合金溶湯中に
含まれるＳｉ量に対する添加Ｐｂ量と、該溶湯中のＰｂ
残留量の関係を整理して示したグラフであり、このグラ
フからも明らかである様に、Ｐｂ添加量がＳｉ量に対し
て当モル量を超えると、溶湯中のＰｂ残留濃度は急激に
増大する傾向が見られ、その添加量がＳｉ量に対して
２．０モル量を超えると、残存Ｐｂによる製品欠陥が顕
著に現われる傾向が認められるので、Ｐｂ添加量は不純
物元素として含まれるＳｉ量に対し約２．０倍モル程度
以下に抑えるべきであることが分かる。FIG. 2 shows the amount of Pb added to the amount of Si contained in the molten Al or Al alloy and the amount of Pb in the molten metal.
It is a graph showing the relationship of the residual amount, and as is clear from this graph, when the added amount of Pb exceeds the equimolar amount with respect to the Si amount, the residual Pb concentration in the molten metal sharply increases. When the amount of addition of Pb exceeds 2.0 mols with respect to the amount of Si, product defects due to residual Pb tend to appear significantly. Therefore, the amount of Pb added is the amount of Si contained as an impurity element. On the other hand, it is understood that the amount should be suppressed to about 2.0 times or less.
【００２０】[0020]
【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合金中に不純物元素として含まれるＳｉを
低コストで且つ効率よく除去することができ、高純度な
ＡｌまたはＡｌ合金を溶製することができた。The present invention is constituted as described above, and A
It was possible to efficiently remove Si contained as an impurity element in 1 or Al alloy at low cost and to produce high-purity Al or Al alloy.
【図１】ＡｌまたはＡｌ合金溶湯中に含まれるＳｉ量に
対する添加Ｐｂ量とＳｉ−Ｐｂ系複合酸化物生成量の関
係を整理して示したグラフである。FIG. 1 is a graph summarizing the relationship between the amount of added Pb and the amount of Si—Pb-based composite oxide produced with respect to the amount of Si contained in Al or Al alloy molten metal.
【図２】ＡｌまたはＡｌ合金溶湯中に含まれるＳｉ量に
対する添加Ｐｂ量と、該溶湯中のＰｂ残留量の関係を整
理して示したグラフである。FIG. 2 is a graph summarizing the relationship between the amount of added Pb with respect to the amount of Si contained in Al or Al alloy molten metal and the residual amount of Pb in the molten metal.
───────────────────────────────────────────────────── 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 (58)調査した分野(Int.Cl.7，ＤＢ名) C22B 1/00 - 61/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Ohsumi Kenji Osumi 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Kobe Steel Works, Ltd. Kobe Research Institute (58) Fields investigated (Int.Cl. 7 , DB name) C22B 1/00-61/00
Claims (3)
合金溶湯中に、Ｐｂおよび／またはＰｂ含有化合物を添
加し、Ｓｉとの間でＳｉ−Ｐｂ系複合酸化物を形成させ
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合金の溶解法。1. Al or Al containing Si as an impurity
Dissolution of Al or Al alloy, characterized by including a step of adding Pb and / or a Pb-containing compound to the molten alloy to form a Si-Pb-based complex oxide with Si and separating this. Law.
ｌまたはＡｌ合金溶湯中に不活性ガスを吹込み、溶湯中
の該複合酸化物の浮上分離を促進する請求項１に記載の
溶解法。2. A in which a Si—Pb complex oxide is formed
2. The melting method according to claim 1, wherein an inert gas is blown into the molten alloy of Al or Al alloy to promote floating separation of the complex oxide in the molten metal.
ｌまたはＡｌ合金溶湯中の該複合酸化物を、耐火性フィ
ルターを用いて分離除去する請求項１または２に記載の
溶解法。3. A in which a Si—Pb-based composite oxide is formed
3. The melting method according to claim 1, wherein the complex oxide in the molten metal of Al or Al alloy is separated and removed using a refractory filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20103794A JP3379232B2 (en) | 1994-08-25 | 1994-08-25 | Dissolution method of Al or Al alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20103794A JP3379232B2 (en) | 1994-08-25 | 1994-08-25 | Dissolution method of Al or Al alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0867924A JPH0867924A (en) | 1996-03-12 |
| JP3379232B2 true JP3379232B2 (en) | 2003-02-24 |
Family
ID=16434389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20103794A Expired - Fee Related JP3379232B2 (en) | 1994-08-25 | 1994-08-25 | Dissolution method of Al or Al alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3379232B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| TW466558B (en) * | 1999-09-30 | 2001-12-01 | Purex Co Ltd | Method of removing contamination adhered to surfaces and apparatus used therefor |
-
1994
- 1994-08-25 JP JP20103794A patent/JP3379232B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0867924A (en) | 1996-03-12 |
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