JPS63199830A - Method for filtering molten aluminum - Google Patents
Method for filtering molten aluminumInfo
- Publication number
- JPS63199830A JPS63199830A JP62030707A JP3070787A JPS63199830A JP S63199830 A JPS63199830 A JP S63199830A JP 62030707 A JP62030707 A JP 62030707A JP 3070787 A JP3070787 A JP 3070787A JP S63199830 A JPS63199830 A JP S63199830A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- molten
- filter
- inclusion
- melt
- 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.)
- Pending
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims description 16
- 229910052782 aluminium Inorganic materials 0.000 title claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 97
- 239000002184 metal Substances 0.000 claims description 97
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 238000005266 casting Methods 0.000 abstract description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005192 partition Methods 0.000 abstract description 3
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 239000000155 melt Substances 0.000 abstract 5
- 229910052593 corundum Inorganic materials 0.000 abstract 2
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 2
- 101150054854 POU1F1 gene Proteins 0.000 abstract 1
- 238000002791 soaking Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 238000007664 blowing Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000011164 potassium chloride Nutrition 0.000 description 2
- 239000001103 potassium chloride Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- CAVCGVPGBKGDTG-UHFFFAOYSA-N alumanylidynemethyl(alumanylidynemethylalumanylidenemethylidene)alumane Chemical group [Al]#C[Al]=C=[Al]C#[Al] CAVCGVPGBKGDTG-UHFFFAOYSA-N 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013327 media filtration Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、アルミニウムまたはアルミニウム合金溶湯中
に含まれる介在物の濾過方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for filtering inclusions contained in molten aluminum or aluminum alloy.
従来の技術
金属溶湯を濾過Ｍ製する硬質濾材濾過機は、アルミナ粒
子をバインダーにより結合した多孔質体を１１４４とし
て使用する例が多い。これら濾材の孔径は通常２００μ
ｍ以上であって使用開始時の初圧が高くなることから、
こ“れより細かい孔径とすることは不可能である。しか
しながら除去の対象となる介在物は１０μｍ以下の場合
もあり、最近はミクロン級の介在物が問題とされる場合
もある。Conventional hard filter media filtration machines for filtering molten metal often use a porous material 1144 in which alumina particles are bound together with a binder. The pore size of these filter media is usually 200μ
m or more and the initial pressure at the start of use will be high,
It is impossible to make the pore diameter smaller than this. However, the inclusions to be removed may be 10 μm or less, and recently, micron-sized inclusions have become a problem.
このように、濾材の孔径に比して濾過により除去すべき
物質が微小な場合、被濾過溶湯自体に含まれる微小介在
物を利用して濾材表面に更に細かい孔径のいわゆるケー
キ層を形成するプレコート手段が用いられている。また
、特開昭６１−１３０４３０では、金属溶湯の微小介在
物を利用する代わりにプレコート用に塩化ナトリウムま
たは塩化カリウム粉末を添加する方法が提案されている
。In this way, when the substance to be removed by filtration is minute compared to the pore size of the filter medium, pre-coating is used to form a so-called cake layer with an even finer pore size on the surface of the filter medium using minute inclusions contained in the molten metal to be filtered. means are used. Further, JP-A-61-130430 proposes a method of adding sodium chloride or potassium chloride powder for precoating instead of using minute inclusions in molten metal.
発明が解決しようとする問題点
このような濾過機の使用に当り、アルミニウム自体に含
まれる介在物を利用する方法では、プレコートの不十分
な濾過初出品を品質的な要求度が高くない製品に使用し
、安定した逆層が形成された後、より高度な品質要求の
製品の鋳造に使用するという方法が採られている。しか
し、同一純度または同一系統の合金種に対する受注がこ
のような順に都合良く続くとは限゛らず問題があり、更
に、所望純度製品が得られるまでに時間がかかり、設備
の運用効率が良くない。また、後者の塩化ナトリウム、
塩化カリウムをプレコート材とした場合、この溶融塩が
介在物のメタルとの濡れ性を良くするので濾過効率を低
下させる恐れがあり、かつ塩が製品に混入したとき、製
品の腐食を生ずるという問題がある。Problems to be Solved by the Invention When using such a filtration machine, a method that utilizes inclusions contained in aluminum itself is difficult to process from a first-time filtration product with insufficient pre-coating to a product that does not have high quality requirements. After forming a stable inverse layer, it is used to cast products with higher quality requirements. However, there is a problem in that orders for alloys of the same purity or the same family do not always follow suitably in this order, and furthermore, it takes time to obtain products of the desired purity, making it difficult to operate the equipment efficiently. do not have. In addition, the latter sodium chloride,
When potassium chloride is used as a pre-coat material, there is a problem that this molten salt improves the wettability of metal inclusions, which may reduce filtration efficiency, and when the salt gets mixed into the product, it causes corrosion of the product. There is.
発明が解決しようとする問題点
本発明は、このような問題を解消する目的でなされたも
のであって、濾過機の使用に先立って溶湯自体を利用し
て一部を酸化して溶湯中に濾過助材を形成し、濾層に限
られた量の金属溶湯を循環させて濾材に濾過層を形成さ
せる前処理を行なうことにより、濾過機の実使用開始当
初から高品質の製品を得られるようにしたものである。Problems to be Solved by the Invention The present invention was made for the purpose of solving these problems. Prior to using the filter, the molten metal itself is used to partially oxidize the molten metal. By performing pre-treatment to form a filtration aid and circulating a limited amount of molten metal through the filtration layer to form a filtration layer on the filtration media, high-quality products can be obtained from the beginning of actual use of the filtration machine. This is how it was done.
問題点を解決するための手段
かくして、本発明によれば、アルミニウム溶湯の濾過方
法において、溶湯処理槽か、ら濾過機を経て溶湯処理槽
に戻る循環系に予め溶湯を充填し、前記溶湯処理槽で溶
湯を酸化処理して溶湯中に濾過助材を形成せしめ、該溶
湯を前記循環系内で循環させて濾過機の建材にプレコー
ト層を形成せしめた後、溶解保持炉から溶湯を導入し濾
過することを特徴とするアルミニウム溶湯の濾過方法が
提供される。Means for Solving the Problems Thus, according to the present invention, in a method for filtering molten aluminum, a circulating system from a molten metal treatment tank, through a filter, and returned to the molten metal treatment tank is filled in advance with molten metal, and the molten metal is treated After oxidizing the molten metal in the tank to form a filter aid in the molten metal and circulating the molten metal in the circulation system to form a precoat layer on the building material of the filter, the molten metal is introduced from the melting and holding furnace. A method for filtering molten aluminum is provided.
即ち、濾過に先立って限られた量のアルミニウム溶湯に
溶湯処理層で本出願人が先に提案した（特１ｊ昭６Ｏ−
９８３６）ように、溶湯に水蒸気含有空気を吹き込み溶
湯の一部を酸化させ、またアルミニウム合金例えばマグ
ネシウム系合金の場合には、純アルミニウム溶湯に所望
組成となるように金属マグネシウムを少量ずつ添加し、
添加の際に空気に触れて酸化物を形成せしめるようにし
、必要により、さらに水蒸気含有空気を吹き込み酸化物
の形成を助長させる。水蒸気含有空気は不活性ガス例え
ばアルゴンガスてｌＯ倍程度に希釈して使用され、気体
中に２Ｏｎ＋ｇ／ｌ程度の水蒸気を含むとプレコート溶
酸化物が効果的に生成される。That is, the present applicant previously proposed that a molten metal treatment layer be applied to a limited amount of molten aluminum prior to filtration (Special Patent No. 1j Sho 6O-
9836), a part of the molten metal is oxidized by blowing steam-containing air into the molten metal, and in the case of an aluminum alloy, such as a magnesium alloy, metallic magnesium is added little by little to the pure aluminum molten metal to obtain the desired composition.
At the time of addition, air is exposed to form an oxide, and if necessary, water vapor-containing air is further blown to promote the formation of an oxide. The water vapor-containing air is used after being diluted to about 10 times with an inert gas, such as argon gas, and when the gas contains about 2 On+g/l of water vapor, a precoat dissolved oxide is effectively generated.
上記酸化物を濾過助材とし、溶湯を濾過機と溶湯処理種
間に循環させ、濾材に必要なプレコート層を形成せしめ
た後、改めて溶解保持炉からの溶湯を導き、鋳造用濾過
を行なうものである。The above oxide is used as a filter aid, and the molten metal is circulated between the filter and the molten metal processing device to form the necessary precoat layer on the filter material, and then the molten metal is led from the melting and holding furnace again to perform casting filtration. It is.
本発明方法を、その具体化された装置に基づいて説明す
る。The method of the present invention will be explained based on an apparatus in which the method is embodied.
第１図は、装置の概略系統図を示し、アルミニウム溶解
保持炉（１）と、鋳造機（２１）への鋳造機（２０）の
間に、溶湯処理槽（２）、濾過機（１４）、湯溜り（１
７）。Figure 1 shows a schematic system diagram of the equipment, with a molten metal processing tank (2), a filter (14) and , hot water pool (1
7).
メタルポンプ（１８）及び循環用の樋（１９）からなる
溶湯循環系が形成されている。溶湯処理槽（２）は、そ
の詳細構造を第２図に示すように、るつぼ（１１）が溶
湯処理槽本体（３）内に配置され、電熱板（１３）によ
り加熱され溶湯を７２０〜７３０℃に保持する。A molten metal circulation system consisting of a metal pump (18) and a circulation gutter (19) is formed. As the detailed structure of the molten metal processing tank (2) is shown in FIG. Keep at ℃.
るつぼ（１１）の加熱方法は上記方法以外に、るつぼ上
面からの加熱または浸漬ヒーターによる加熱も可能であ
る。In addition to the method described above, heating the crucible (11) from the top surface of the crucible or heating with an immersion heater is also possible.
また、るつぼ（１１）には溶湯人口（５）から溶湯出口
（６）ヘショートパスしないように仕切壁（ｌＯ）が設
けられ、そのるつぼ底部に水蒸気を含んだ空気を溶湯に
吹き込むためのポーラスプラグ（１２）を設け、該ポー
ラスプラグ（１２）には水蒸気含有空気等のガス供給管
を経て吹込ガズ人口（７）が開口している。In addition, a partition wall (lO) is provided in the crucible (11) to prevent a short path from the molten metal population (5) to the molten metal outlet (6), and a porous wall is provided at the bottom of the crucible to blow air containing water vapor into the molten metal. A plug (12) is provided, and a blowing gas population (7) is opened to the porous plug (12) via a gas supply pipe for water vapor-containing air or the like.
るつぼの蓋（４）にはガス出口（８）およびるつぼ内ア
ルミニウム溶湯の温度を検出する熱電対（９）が取り付
けられている。A gas outlet (8) and a thermocouple (9) for detecting the temperature of the molten aluminum in the crucible are attached to the lid (4) of the crucible.
なお、るつぼ（，１１）の容量としては溶湯の平均滞留
時間が３分以上となることが好ましく、流量が１０ｋｇ
／ａ＋ｉｎの場合であれば容ｆｆ１３００ｋｇ以上のも
のが使用される。The capacity of the crucible (11) is preferably such that the average residence time of the molten metal is 3 minutes or more, and the flow rate is 10 kg.
In the case of /a+in, one with a capacity of 1,300 kg or more is used.
濾過機（１４）はチューブラ−フィルタータイプの定速
濾過型で、濾層（１５）の前後にそれぞれの溶湯レベル
を検出する溶湯レベル検出器（１６）が設けられている
。ポンプ（１８）は湯溜り（１７）から樋（１９）を経
て溶湯処理槽（２）に溶湯を戻し循環させるためのもの
で、液体金属用のメタルポンプが用いられ、駆動方式は
機械式、電磁式の何れでもよく、揚程は、溶湯処理槽人
口側の溶湯レベルよりも高い位置に溶湯を戻す必要から
５０ ｃ ｒｎ以上あることが望ましい。吐出量は実際
の鋳造時の溶湯流量に近く、かつ濾過機の濾材の表面積
当たり０ 、５ ｋｇｌｃＩｗ２・ｈｒを超えないこと
が望ましい。この流量以上に大きくなると、本発明方法
により濾過様濾材表面に集積した介在物により形成され
るプレコート層が不安定となり、溶湯の流量変化により
濾過された溶湯純度が変動する恐れがあるからである。The filter (14) is a constant speed filtration type tubular filter, and molten metal level detectors (16) for detecting the respective molten metal levels are provided before and after the filter layer (15). The pump (18) is for circulating the molten metal from the water reservoir (17) through the gutter (19) and back to the molten metal processing tank (2), and is a metal pump for liquid metal, and the drive system is mechanical. Any type of electromagnetic type may be used, and the lifting height is preferably 50 cm or more since the molten metal needs to be returned to a position higher than the molten metal level on the artificial side of the molten metal treatment tank. It is desirable that the discharge rate be close to the flow rate of molten metal during actual casting and not exceed 0.5 kglcIw2·hr per surface area of the filter medium of the filter. If the flow rate exceeds this value, the precoat layer formed by the inclusions accumulated on the surface of the filtration-like filter medium by the method of the present invention will become unstable, and the purity of the filtered molten metal may fluctuate due to changes in the flow rate of the molten metal. .
作用
本発明による溶湯の濾過方法を説明する。溶解保持炉（
１）では、アルミニウムインゴット、リターン材、およ
び比較的高純度の電解溶湯等を用いて所定純度に配合さ
れたアルミニウム溶湯が加熱保持されている。溶湯処理
槽、濾過機、メタルポンプ等は溶湯の充填に先立ってそ
れぞれ加熱された後、系内に溶湯が充填される。溶湯は
７２０〜７３０℃に維持され、メタルポンプを駆動させ
溶湯を循環させる。溶湯処理槽では、既述した方法によ
りアルミニウムまたはアルミニウム合金溶湯中に酸化物
が形成される。なお、電解炉から出湯した電解溶湯は、
溶湯中にアルミニウムカーバイド。Function: The molten metal filtration method according to the present invention will be explained. Melting and holding furnace (
In 1), molten aluminum mixed to a predetermined purity using an aluminum ingot, a return material, and relatively high-purity electrolytic molten metal is heated and maintained. The molten metal processing tank, filter, metal pump, etc. are each heated prior to being filled with molten metal, and then the molten metal is filled into the system. The molten metal is maintained at 720 to 730°C, and a metal pump is driven to circulate the molten metal. In the molten metal treatment tank, oxides are formed in the molten aluminum or aluminum alloy by the method described above. In addition, the electrolytic molten metal tapped from the electrolytic furnace is
Aluminum carbide in molten metal.
アルミナ等を含むので、これらがプレコート材として作
用するが、溶湯処理槽で空気吹込みを行なうことにより
プレコートが促進される。Since it contains alumina and the like, these act as pre-coating materials, and pre-coating is promoted by blowing air into the molten metal treatment tank.
次いで、前処理を受けた溶湯は濾過機（１４）に入り絶
層（１５）で濾過されるとともに、含有する酸化物等の
介在物の一部が濾材にトラップされ、濾材をプレコート
する。本実施例では濾過速度を一定とした定速型の濾過
機が用いられ、絶層の前後にそれぞれ溶湯レベル検出器
（６）が組み込まれ、溶湯レベル差を検知できるように
なっている。濾過された溶湯は湯溜り（１７）からメタ
ルポンプ（１８）により、樋（１９）を経て溶湯処理槽
（２）に戻され、溶湯処理槽−濾過様系内を循環する。Next, the pretreated molten metal enters the filter (14) and is filtered through the barrier layer (15), and some of the inclusions such as oxides contained therein are trapped in the filter medium, thereby precoating the filter medium. In this embodiment, a constant speed type filter with a constant filtration speed is used, and molten metal level detectors (6) are installed before and after the peak, respectively, so that differences in molten metal level can be detected. The filtered molten metal is returned from the sump (17) to the molten metal processing tank (2) via the gutter (19) by the metal pump (18), and circulates within the molten metal processing tank-filtration system.
なお、予め濾過機の絶層前後における溶湯レベル差と濾
過後の溶湯中の介在物量との関係を求めて置くことによ
り、所定のレベル差となったとき、必要なプレコート層
が形成されたことを知ることができる。In addition, by determining the relationship between the molten metal level difference before and after the filtration and the amount of inclusions in the molten metal after filtration in advance, it can be determined that the necessary precoat layer has been formed when a predetermined level difference is reached. can be known.
溶湯処理槽−濾過様系内を循環する溶湯の量は限定され
、従って溶湯中に含まれる介在物の量が適切なプレコー
ト層を形成するためには不足することとなるが、本発明
では、溶湯処理槽で溶湯の一部を酸化する前処理を行な
うことにより、プレコートに必要かつ充分な酸化物を形
成せしめることが可能となる。The amount of molten metal circulating in the molten metal treatment tank - filtration-like system is limited, and therefore the amount of inclusions contained in the molten metal is insufficient to form a suitable precoat layer, but in the present invention, By performing pretreatment to oxidize a portion of the molten metal in the molten metal treatment tank, it becomes possible to form a necessary and sufficient oxide for precoating.
溶湯を循環させている間に、溶湯中の介在物が濾材をプ
レコートし、濾過機の溶湯レベル検出器から示される溶
湯レベル差は増大し、所定レベル差に達し、所要のプレ
コート層が形成される。ここで系内の溶湯の循環を解除
し、当初の溶解保持炉、または別の溶解保持炉から溶湯
が供給され、鋳造のための溶湯の濾過が開始される。While the molten metal is being circulated, the inclusions in the molten metal pre-coat the filter medium, and the molten metal level difference indicated by the molten metal level detector of the filter increases until it reaches a predetermined level difference and the required pre-coat layer is formed. Ru. At this point, the circulation of the molten metal in the system is stopped, molten metal is supplied from the original melting and holding furnace or another melting and holding furnace, and filtration of the molten metal for casting is started.
実施例
以下、実施例及び比較例により、本発明をさらに具体的
に説明する。EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples.
マグネシウム４％を含むマグネシウム系アルミニウム溶
湯の濾過を行なった。第１図に示される循環系内に予め
アルミニウム溶湯を満たした。所要溶？ａｍは１，８０
０ｋｇであった。これにマグネシウムが約４％となるよ
う８０ｋｇを、溶湯を循環させながらマグネシウムイン
ゴットを少量ずつ添加した。同時に２Ｏｎ＋３／ｌの水
蒸気を含む空気をアルゴンガスて希釈してポーラスプラ
グから溶湯中に吹き込んだ。濾過機の濾過表面積は２ｍ
２て、濾過速度０ 、５ ｋｇ／ｃｍ２・ｈｒて循環さ
せ、２時間循環後に濾過機の絶層前後の溶湯レベル差が
所定の２０ｍｍに達したので、循環を止め、別の溶解保
持炉から脱ガス、脱滓された４％マグネシウムのアルミ
ニウム合金溶湯を導入し、濾過して鋳造に供した。A magnesium-based aluminum molten metal containing 4% magnesium was filtered. The circulation system shown in FIG. 1 was filled with molten aluminum in advance. Required melt? am is 1,80
It was 0 kg. To this, 80 kg of magnesium ingot was added little by little while circulating the molten metal so that the magnesium content was about 4%. At the same time, air containing 2On+3/l of water vapor was diluted with argon gas and blown into the molten metal through a porous plug. The filtration surface area of the filter is 2m
2, the molten metal was circulated at a filtration rate of 0, 5 kg/cm2・hr, and after 2 hours of circulation, the difference in the molten metal level before and after the filter reached the predetermined 20 mm, so the circulation was stopped and the molten metal was transferred from another melting and holding furnace. A 4% magnesium aluminum alloy molten metal that had been degassed and descaled was introduced, filtered, and subjected to casting.
鋳造ｆｆ１Ｂ、０００ｋｇ＊に１０ツトとし、累積鋳造
量、各ロットの濾過機絶層前後の溶湯レベル差の平均値
および各ロットの鋳塊から製造された試験片をアルマイ
ト処理した場合の介在物に起因する不良率を第１表に示
す。Casting ff1B, 10 pieces per 000 kg*, the cumulative casting amount, the average value of the molten metal level difference before and after the filter layer of each lot, and the inclusions when a test piece manufactured from the ingot of each lot was anodized. The resulting defective rates are shown in Table 1.
比較例１として、前処理を行なうことなく前記と同じ組
成のマグネシウム系合金を濾過した。また、比較例２と
して、前処理を行なうことなく同様にマグネシウム系合
金溶湯を濾過し、最初の２０ツトを他の製品用に充当し
、第３０ツト目から本製品用とした。これらの結果を同
じく第１表に示す。As Comparative Example 1, a magnesium alloy having the same composition as above was filtered without performing any pretreatment. In addition, as Comparative Example 2, molten magnesium alloy was similarly filtered without pretreatment, and the first 20 samples were used for other products, and the 30th sample was used for this product. These results are also shown in Table 1.
第１表から、比較例１では、始めの２０ツトでは非常に
高い不良率を生じ、比較例２の第３０ツト目からのもの
は、不良率は減少し一桁台にはなっているが、不良率に
ばらつきが見られる。これに対し、本発明実施例では、
濾過の最初のロットから３％以下の低不良率の安定した
製品が得られることがわかる。From Table 1, in Comparative Example 1, the first 20 samples resulted in a very high defective rate, while in Comparative Example 2, from the 30th sample, the defective rate decreased to a single digit level. , there are variations in the defective rate. On the other hand, in the embodiment of the present invention,
It can be seen that a stable product with a low defect rate of 3% or less can be obtained from the first lot of filtration.
以下余白
発明の効果
本発明方法によれば、濾過に必要なプレコート層を効果
的に形成させることができ、濾過当初の製品を他の目的
に充当し、°または再溶解する必要がなく、濾過機の実
使用開始当初から高品質の製品を鋳造できるので、生産
コストを低減でき、設備の運用効率を改善できる等優れ
た効果を有する。According to the method of the present invention, the precoat layer necessary for filtration can be effectively formed, and the product initially filtered can be used for other purposes, and there is no need to redissolve or redissolve the product. Since high-quality products can be cast from the beginning of actual use of the machine, it has excellent effects such as reducing production costs and improving equipment operational efficiency.
第１図は本発明方法を具体化した濾過装置の系統図で、
第２図は溶湯処理槽Φ縦断面図である。
（１）・・・溶解保持炉、（２）・・・溶湯処理槽、（
３）・・・湯処理槽本体、（４）・・・蓋、（５）・・
・溶湯人口、（６）・・・溶湯出口。
（７）・・・吹込ガス入口、（８）・・・ガス出口、（
１０）・・・仕切壁。
（１１）・・・るつぼ、 （１２）・・・ポーラスプラ
グ、 （１４）・・・濾過機、（１５）・・・絶層、（
１６）・・・溶湯レベル検出器、 （１７）・・・湯溜
り、 （１Ｂ）・・・メタルポンプ、 （２１）・・・
鋳造機。FIG. 1 is a system diagram of a filtration device embodying the method of the present invention.
FIG. 2 is a longitudinal sectional view of the molten metal treatment tank Φ. (1)... Melting and holding furnace, (2)... Molten metal processing tank, (
3)... Hot water treatment tank body, (4)... Lid, (5)...
・Molten metal population, (6)... Molten metal outlet. (7)... Blowing gas inlet, (8)... Gas outlet, (
10)...Partition wall. (11)... Crucible, (12)... Porous plug, (14)... Filter, (15)... Extreme layer, (
16)... Molten metal level detector, (17)... Water pool, (1B)... Metal pump, (21)...
Casting machine.
Claims (1)
から濾過機を経て溶湯処理槽に戻る循環系に予め溶湯を
充填し、前記溶湯処理槽で溶湯を酸化処理して溶湯中に
濾過助材を形成せしめ、該溶湯を前記循環系内で循環さ
せて濾過機の濾材にプレコート層を形成せしめた後、溶
解保持炉から溶湯を導入し濾過することを特徴とするア
ルミニウム溶湯の濾過方法。1. In a method for filtering molten aluminum, a circulating system from a molten metal treatment tank to the molten metal treatment tank via a filter is filled with molten metal in advance, and the molten metal is oxidized in the molten metal treatment tank to form a filter aid in the molten metal. A method for filtering molten aluminum, comprising: circulating the molten metal in the circulation system to form a precoat layer on a filter medium of a filter, and then introducing the molten metal from a melting and holding furnace and filtering it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62030707A JPS63199830A (en) | 1987-02-14 | 1987-02-14 | Method for filtering molten aluminum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62030707A JPS63199830A (en) | 1987-02-14 | 1987-02-14 | Method for filtering molten aluminum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63199830A true JPS63199830A (en) | 1988-08-18 |
Family
ID=12311118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62030707A Pending JPS63199830A (en) | 1987-02-14 | 1987-02-14 | Method for filtering molten aluminum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63199830A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004101112A (en) * | 2002-09-11 | 2004-04-02 | Dowa Mining Co Ltd | Dross removing device and dross removing system |
-
1987
- 1987-02-14 JP JP62030707A patent/JPS63199830A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004101112A (en) * | 2002-09-11 | 2004-04-02 | Dowa Mining Co Ltd | Dross removing device and dross removing system |
| JP4500486B2 (en) * | 2002-09-11 | 2010-07-14 | Ｄｏｗａホールディングス株式会社 | Dross removal device and dross removal system |
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