JP4500486B2 - Dross removal device and dross removal system - Google Patents

Dross removal device and dross removal system Download PDF

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Publication number
JP4500486B2
JP4500486B2 JP2002265490A JP2002265490A JP4500486B2 JP 4500486 B2 JP4500486 B2 JP 4500486B2 JP 2002265490 A JP2002265490 A JP 2002265490A JP 2002265490 A JP2002265490 A JP 2002265490A JP 4500486 B2 JP4500486 B2 JP 4500486B2
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Prior art keywords
dross
molten metal
hot water
water reservoir
tube
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JP2004101112A (en
Inventor
幸雄 佐藤
和司 佐野
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Dowa Holdings Co Ltd
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Dowa Holdings Co Ltd
Dowa Mining Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は,例えばガリウム等の金属溶湯中に発生するドロスを,金属溶湯中から除去する装置及びシステムに関する。
【0002】
【従来の技術】
例えばガリウム(Ga)等の金属を精製する方法として,精製槽に液体状態の金属である溶湯を収容し,攪拌しながら凝固させることにより,不純物濃度の低い結晶した金属を分離する精製方法が用いられる。このような精製方法として,例えば,特開2000−129372号公報等に開示されたものが知られている。かかる精製する前の金属溶湯中には,ドロス(金属酸化物)が含まれている。ドロスは純粋な金属溶湯より比重が小さく,精製槽内に金属溶湯を貯留すると液面にドロスが浮上する。従来,精製槽内に金属溶湯を貯留した後,精製を開始する前に,液面に浮遊するドロスを手作業で掬い取っていた。
【0003】
【発明が解決しようとする課題】
しかしながら,従来のようにドロスを掬い取る方法は作業効率が悪く,操業効率を向上させることが困難であった。また,ドロスを掬い取る際に,金属溶湯を一緒に多く掬い取ってしまうことがあり,精製される金属の歩留りの悪化を招く虞があった。
【0004】
また,例えばガリウム等の金属を鋳造する際に鋳型に注入する金属溶湯中にも,ドロスが含まれている。しかしながら,従来,鋳造工程においてはドロスを除去できず,鋳造製品中にドロスが混入するといった不具合があった。
【0005】
従って,本発明の目的は,金属溶湯からドロスを効率的に除去することができるドロス除去装置及びドロス除去システムを提供することにある。
【0006】
【課題を解決するための手段】
上記課題を解決するために,本発明によれば,金属溶湯が圧送される加圧状態の流路の途中に前記流路より低圧状態となる湯溜め部が介設され,前記湯溜め部を上流側と下流側に仕切る仕切り板を設け,前記流路は前記湯溜め部の上流側と下流側にそれぞれ接続され,前記仕切り板の下部に金属溶湯を通過させる通口を設けたことを特徴とする,ドロス除去装置が提供される。このドロス除去装置にあっては,湯溜め部の上流側でドロスを浮上させて溜めることにより,金属溶湯からドロスを除去できる。
【0007】
さらに,前記湯溜め部の底部に,ドロスを排出する排出路を設けることが好ましい。即ち,溜まったドロスを湯溜め部の底部から排出路に落下させて,効率的に排出できる。
【0008】
また,本発明によれば,金属溶湯が圧送される複数の加圧状態の流路に,請求項1又は2に記載のドロス除去装置をそれぞれ設け,金属溶湯を分岐させて前記各流路に対して選択的に流す切換弁および前記各流路を流れる金属溶湯を合流させる切換弁を設けたことを特徴とする,ドロス除去システムが提供される。このドロス除去システムにあっては,1つの流路に設けたドロス除去装置にドロスが蓄積されて除去性能が低下したら,他の流路に金属溶湯を流すように切換弁を切り換えて,この流路に設けたドロス除去装置によってドロスを除去できる。従って,除去性能を高く維持できる。さらに,1つのドロス除去装置によってドロスを除去する間に,他のドロス除去装置からドロスを排出できるので,操業効率が良い。
【0009】
【発明の実施の形態】
以下,本発明の好ましい実施の形態を説明する。図1は,本実施の形態にかかるドロス除去装置1の概略縦断面図である。チューブ3は,図示しない原料タンクからガリウムの精製槽に,金属溶湯として液体ガリウムを圧送する流路である。チューブ3には,ドロス除去装置1の湯溜め容器5が介設されている。
【0010】
湯溜め容器5は,筒状側壁と底部から構成され,上部に取り外し可能な上蓋6が備えられている。また,湯溜め容器5の内部を上流側と下流側に2つに仕切るように略垂直に,仕切り板7が設けられている。湯溜め容器5の内部は,仕切り板7によって,上流側S1と下流側S2に仕切られている。仕切り板7の下部には,液体ガリウムを上流側S1から下流側S2に通過させる通口8が設けられている。
【0011】
前述のチューブ3は,上流側S1の上部と,下流側S2の上部にそれぞれ接続されている。湯溜め容器5の底部には,湯溜め容器5からドロスを排出するための,開閉可能な排出路10が設けられている。
【0012】
次に,以上のように構成されたドロス除去装置1を用いたドロスの除去について説明する。図示しない原料タンクに貯留された液体ガリウムを,チューブ3によってドロス除去装置1に向かって圧送し,上流側S1の上部から湯溜め容器5の内部に導入する。上流側S1に流入した液体ガリウムは,通口8より下流側S2に流入し,湯溜め容器5内の上流側S1と下流側S2にまたがって液体ガリウムが溜められる。なお,チューブ3内で液体ガリウムを加圧する圧力は,約1.8kg/cm程度である。
【0013】
チューブ3から圧送される液体ガリウムは,液体ガリウムより比重の軽いドロスを含有している。このドロスは,酸化ガリウムや,窒素や酸素などの気体を含有している。加圧状態のチューブ3から,チューブ3内よりも低圧状態となる湯溜め容器5に液体ガリウムが流入すると,ドロスに含有されている気体が膨張することにより,ドロス全体が膨張して比重が小さくなり,液体ガリウムから浮上しやすくなる。従って,上流側S1に液体ガリウムを溜めると,ドロスが上流側S1の上部に浮上する。一方,液体ガリウムは,ドロスより比重が大きく,上流側S1の下部に沈む。こうして,液体ガリウムとドロスを分離させることができる。
【0014】
上流側S1の下部に移動した液体ガリウムは,通口8を通過して下流側S2に流入して,チューブ3によって下流側S2の上部から導出される。一方,上流側S1の上部に浮上したドロスは,仕切り板7によって堰き止められ,下流側S2に流入せず,そのまま上流側S1に蓄積される。このようにして,液体ガリウムからドロスを除去することができる。
【0015】
ドロス除去装置1によってドロスが除去された液体ガリウムは,再びチューブ3によって圧送され,図示しない精製槽に導入される。一方,ドロス除去装置1に蓄積されたドロスは,排出路10を開口させることにより,湯溜め容器5の底部から排出路10に落下させて排出することができる。
【0016】
かかるドロス除去装置1によれば,チューブ3の途中に湯溜め容器5を形成したことにより,送液中の液体ガリウムからドロスを分離させることができ,仕切り板7を形成したことにより,分離させたドロスを堰き止めて,液体ガリウムのみを送液することができる。従って,液体ガリウムからドロスを効率的に除去できる。さらに,ガリウム精製工程全体の作業効率,操業効率を向上させることができる。
【0017】
以上,本発明の好適な実施の形態の一例を示したが,本発明はここで説明した形態に限定されない。例えば,金属溶湯は液体ガリウムに限定されず,その他の種々の金属溶湯であっても良い。
【0018】
ドロス除去装置1は,精製槽に送液する流路に限定されず,種々の流路に適用できる。例えば,鋳造原料タンクに圧送する流路にドロス除去装置1を設けても良い。この場合も,液体ガリウムからドロスを効率的に除去できる。さらに,鋳造製品中に混入するドロスを大幅に減少させることができるので,不具合を抑制できる。
【0019】
本実施の形態では,1本のチューブ3に介設したドロス除去装置1について説明したが,複数の流路を並列に設け,各流路に対して液体ガリウムを選択的に流す構成としても良い。この場合,液体ガリウムの圧送及びドロス除去と,ドロス除去装置に蓄積されたドロスの排出とを,並行して行うことができる。以下に,別の実施の形態にかかるドロス除去システム15について説明する。
【0020】
図2は,ドロス除去システム15の概略を示している。液体ガリウムが圧送されるチューブ17には,チューブ17の途中で分岐して再び合流する2つの分岐チューブ18,19が形成されている。分岐チューブ18,19の各上流端と,分岐チューブ18,19より上流に位置するチューブ17の下流端は,3方切換弁21を介して接続されている。また,分岐チューブ18,19の各下流端と,分岐チューブ18,19より下流に位置するチューブ17の上流端は,3方切換弁23を介して接続されている。従って,3方切換弁21,23の切換によって,分岐チューブ18,19に対して液体ガリウムを選択的に流すことができる。さらに,分岐チューブ18,19には,上述したドロス除去装置1と同様の構成を有するドロス除去装置28,29がそれぞれ介設されている。
【0021】
次に,以上のように構成されたドロス除去システム15を用いたドロスの除去について説明する。先ず,3方切換弁21,23の切換により,液体ガリウムを分岐チューブ18に通過させ,分岐チューブ19には通過させない状態とする。そして,図示しない原料タンクに貯留された液体ガリウムを,チューブ17,18に順に通過させて圧送し,分岐チューブ18に設けたドロス除去装置28に導入してドロスを除去し,ドロス除去後の液体ガリウムを分岐チューブ18,チューブ17に順に通過させて圧送する。
【0022】
ドロス除去装置28におけるドロスの蓄積量が増加することにより,ドロス除去性能が低下したら,3方切換弁21,23を切り換えて,液体ガリウムを分岐チューブ19に通過させる状態とし,分岐チューブ18に通過させない状態とする。そして,図示しない原料タンクに貯留された液体ガリウムを,チューブ17,19に順に通過させて圧送し,分岐チューブ19に設けたドロス除去装置29に導入してドロスを除去し,ドロス除去後の液体ガリウムを分岐チューブ19,チューブ17に順に通過させて圧送する。一方,ドロス除去装置29によってドロスを除去する間に,ドロス除去装置28からドロスを排出してドロス除去性能を回復させる。そして,ドロス除去装置29におけるドロスの蓄積量が増加することにより,ドロス除去性能が低下したら,再び3方切換弁21,23を切り換えて,液体ガリウムを分岐チューブ18に通過させ,ドロス除去性能を回復させたドロス除去装置28によってドロス除去を行う。
【0023】
かかるドロス除去システム15によれば,液体ガリウムを分岐チューブ18,19に選択的に流す構成としたことにより,ドロスを排出する際に液体ガリウムの圧送及びドロス除去を中断する必要が無く,操業効率が良い。また,ドロス除去装置28,29のドロス除去性能を交互に回復させることができるので,ドロスの除去性能を常に高く維持できる。
【0024】
なお,ドロス除去装置をそれぞれ設けた2本の分岐チューブ18,19を有する場合について説明したが,勿論,分岐チューブは3本以上に形成し,各分岐流路にドロス除去装置を設けても良い。
【0025】
【実施例】
ドロス除去装置1の効果を検証する実験を行った。先ず,図1に示したドロス除去装置1を介設しないチューブ3によって,液体ガリウムを精製槽に圧送し,精製槽内に貯留した液体ガリウムから採取されたドロスの重さを測定した。結果を表1に示す。次に,ドロス除去装置1を介設したチューブ3によって液体ガリウムを精製槽に圧送し,精製槽内に貯留した液体ガリウムから採取されたドロスの重さを測定した。結果を表2に示す。なお,表1,2において,原料重さとは,チューブ3によって圧送する前の,ドロスを含有する液体ガリウムの重さである。ドロス重さとは,チューブ3によって圧送された後の,精製槽に貯留された液体ガリウムから採取されたドロスの重さである。割合とは,原料重さに対するドロス重さの比率である。
【0026】
【表1】

Figure 0004500486
【0027】
【表2】
Figure 0004500486
【0028】
表1,2の結果に見られるように,ドロス除去装置1を設置しない場合(ドロス除去装置設置前)においては,精製槽内から約2.3kg程度の量のドロスが採取された。一方,ドロス除去装置1を設置した場合(ドロス除去装置設置後)においては,精製槽内から約0.6kg程度の量のドロスが採取された。即ち,ドロス除去装置1を設置しない場合と比較して,精製槽内に発生するドロスが約1/4程度の量に減少したことが確認される。以上の結果から,ドロス除去装置1を設けることにより,送液中の液体ガリウムからドロスを効果的に除去できることが明らかとなった。
【0029】
また,ドロスを採取する前に,精製槽内の液体ガリウム液面に浮上するドロスを目視により観察した結果,ドロス除去装置1を設置した場合においては,設置しない場合と比較して,スポンジ状のドロスが大幅に減少したことが確認された。従って,スポンジ状のドロスを特に効果的に除去できることが明らかとなった。
【0030】
【発明の効果】
本発明によれば,金属溶湯からドロスを効率的に除去することができる。さらに,金属精製等の作業効率,操業効率が向上する。また,鋳造製品中に混入するドロスを大幅に減少させ,不具合を抑制できる。
【図面の簡単な説明】
【図1】ドロス除去装置の概略縦断面図である。
【図2】ドロス除去システムの概略を示す回路図である。
【符号の説明】
S1 上流側
S2 下流側
1 ドロス除去装置
3 チューブ
5 湯溜め容器
6 上蓋
7 仕切り板
8 通口
10 排出路
15 ドロス除去システム
17 チューブ
18,19 分岐チューブ
21,23 3方切換弁
28,29 ドロス除去装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus and a system for removing dross generated in a molten metal such as gallium from the molten metal.
[0002]
[Prior art]
For example, as a method for refining metals such as gallium (Ga), a refining method is used in which molten metal, which is a liquid metal, is contained in a refining tank and solidified while stirring to separate crystallized metal having a low impurity concentration. It is done. As such a purification method, for example, a method disclosed in JP 2000-129372 A is known. The molten metal before purification contains dross (metal oxide). Dross has a lower specific gravity than pure molten metal, and dross rises on the liquid surface when the molten metal is stored in the refining tank. Conventionally, after storing molten metal in the refining tank, before starting refining, the dross floating on the liquid surface was manually scooped up.
[0003]
[Problems to be solved by the invention]
However, the conventional method of scooping out dross has poor work efficiency and it has been difficult to improve operation efficiency. In addition, when scooping out dross, a lot of molten metal may be scooped together, which may lead to deterioration in the yield of the metal to be refined.
[0004]
Also, dross is contained in the molten metal poured into the mold when casting a metal such as gallium, for example. However, conventionally, in the casting process, dross cannot be removed, and there is a problem that dross is mixed into the cast product.
[0005]
Accordingly, an object of the present invention is to provide a dross removing device and a dross removing system capable of efficiently removing dross from a molten metal.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, according to the present invention, a hot water reservoir that is in a lower pressure state than the flow channel is interposed in the middle of a pressurized flow channel through which the molten metal is pumped, and the hot water reservoir is A partition plate for partitioning the upstream side and the downstream side is provided, the flow path is connected to the upstream side and the downstream side of the hot water reservoir, and a passage through which the molten metal passes is provided at the lower part of the partition plate. A dross removal device is provided. In this dross removing apparatus, dross can be removed from the molten metal by floating and collecting the dross on the upstream side of the hot water reservoir.
[0007]
Furthermore, it is preferable to provide a discharge path for discharging dross at the bottom of the hot water reservoir. That is, the accumulated dross can be efficiently discharged by dropping from the bottom of the hot water reservoir to the discharge path.
[0008]
According to the present invention, the dross removing device according to claim 1 or 2 is provided in each of the plurality of pressurized flow paths through which the molten metal is pumped, and the molten metal is branched to each of the flow paths. characterized in that a selective flow switching valve and the switching valve for combining the molten metal flowing through each flow channel for dross removal system is provided. In this dross removal system, when dross accumulates in the dross removal device provided in one flow path and the removal performance deteriorates, the switching valve is switched so that the molten metal flows through the other flow path. Dross can be removed by a dross removing device provided on the road. Therefore, the removal performance can be kept high. Furthermore, since dross can be discharged from another dross removing device while removing dross by one dross removing device, the operation efficiency is good.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described. FIG. 1 is a schematic longitudinal sectional view of a dross removing apparatus 1 according to the present embodiment. The tube 3 is a flow path for pumping liquid gallium as a molten metal from a raw material tank (not shown) to a gallium refining tank. The tube 3 is provided with a hot water reservoir 5 of the dross removing device 1.
[0010]
The hot water reservoir 5 is composed of a cylindrical side wall and a bottom, and is provided with a removable upper lid 6 at the top. Further, a partition plate 7 is provided substantially vertically so as to partition the inside of the hot water reservoir 5 into two on the upstream side and the downstream side. The interior of the hot water reservoir 5 is partitioned by a partition plate 7 into an upstream side S1 and a downstream side S2. At the lower part of the partition plate 7, a through-hole 8 is provided for allowing liquid gallium to pass from the upstream side S1 to the downstream side S2.
[0011]
The aforementioned tubes 3 are connected to the upper part of the upstream side S1 and the upper part of the downstream side S2, respectively. An openable and closable discharge path 10 for discharging dross from the hot water reservoir 5 is provided at the bottom of the hot water reservoir 5.
[0012]
Next, dross removal using the dross removing apparatus 1 configured as described above will be described. Liquid gallium stored in a raw material tank (not shown) is pumped toward the dross removing device 1 through the tube 3 and introduced into the hot water reservoir 5 from the upper part of the upstream side S1. The liquid gallium that has flowed into the upstream side S1 flows into the downstream side S2 from the passage 8 and is stored across the upstream side S1 and the downstream side S2 in the hot water reservoir 5. The pressure for pressurizing the liquid gallium in the tube 3 is about 1.8 kg / cm 2 .
[0013]
The liquid gallium pumped from the tube 3 contains dross having a lighter specific gravity than the liquid gallium. This dross contains gallium oxide and gases such as nitrogen and oxygen. When liquid gallium flows from the pressurized tube 3 into the hot water reservoir 5 which is in a lower pressure state than the inside of the tube 3, the gas contained in the dross expands, so that the entire dross expands and the specific gravity is small. It becomes easier to float from liquid gallium. Therefore, when liquid gallium is accumulated on the upstream side S1, dross floats above the upstream side S1. On the other hand, liquid gallium has a higher specific gravity than dross and sinks in the lower part of the upstream side S1. In this way, liquid gallium and dross can be separated.
[0014]
The liquid gallium that has moved to the lower part of the upstream side S1 passes through the passage 8 and flows into the downstream side S2, and is led out from the upper part of the downstream side S2 by the tube 3. On the other hand, the dross that has floated to the upper part of the upstream side S1 is blocked by the partition plate 7, does not flow into the downstream side S2, and is directly accumulated in the upstream side S1. In this way, dross can be removed from the liquid gallium.
[0015]
The liquid gallium from which dross has been removed by the dross removing device 1 is again pumped by the tube 3 and introduced into a purification tank (not shown). On the other hand, the dross accumulated in the dross removing device 1 can be dropped and discharged from the bottom of the hot water reservoir 5 to the discharge path 10 by opening the discharge path 10.
[0016]
According to the dross removing apparatus 1, the dross can be separated from the liquid gallium being fed by forming the hot water reservoir 5 in the middle of the tube 3, and the separating plate 7 can be separated by forming the partition plate 7. The dross can be blocked and only liquid gallium can be fed. Therefore, dross can be efficiently removed from liquid gallium. Furthermore, the work efficiency and operation efficiency of the entire gallium purification process can be improved.
[0017]
Although an example of a preferred embodiment of the present invention has been described above, the present invention is not limited to the embodiment described here. For example, the molten metal is not limited to liquid gallium, and other various molten metal may be used.
[0018]
The dross removing apparatus 1 is not limited to the flow path for sending liquid to the purification tank, and can be applied to various flow paths. For example, you may provide the dross removal apparatus 1 in the flow path pumped to a casting raw material tank. Also in this case, dross can be efficiently removed from the liquid gallium. Furthermore, dross mixed in the cast product can be greatly reduced, so that defects can be suppressed.
[0019]
In the present embodiment, the dross removing apparatus 1 interposed in one tube 3 has been described. However, a configuration may be adopted in which a plurality of flow paths are provided in parallel and liquid gallium is selectively allowed to flow through each flow path. . In this case, the liquid gallium pumping and dross removal and the dross accumulated in the dross removal device can be discharged in parallel. Below, the dross removal system 15 concerning another embodiment is demonstrated.
[0020]
FIG. 2 shows an outline of the dross removal system 15. The tube 17 to which liquid gallium is pumped is formed with two branch tubes 18 and 19 that branch in the middle of the tube 17 and merge again. The upstream ends of the branch tubes 18 and 19 and the downstream end of the tube 17 located upstream of the branch tubes 18 and 19 are connected via a three-way switching valve 21. Further, the downstream ends of the branch tubes 18 and 19 and the upstream end of the tube 17 positioned downstream of the branch tubes 18 and 19 are connected via a three-way switching valve 23. Therefore, liquid gallium can be selectively passed through the branch tubes 18 and 19 by switching the three-way switching valves 21 and 23. Further, dross removing devices 28 and 29 having the same configuration as the dross removing device 1 described above are interposed in the branch tubes 18 and 19, respectively.
[0021]
Next, dross removal using the dross removal system 15 configured as described above will be described. First, the liquid gallium is allowed to pass through the branch tube 18 and is not allowed to pass through the branch tube 19 by switching of the three-way switching valves 21 and 23. Then, liquid gallium stored in a raw material tank (not shown) is passed through the tubes 17 and 18 in order and pumped, introduced into a dross removing device 28 provided in the branch tube 18 to remove dross, and liquid after dross removal. Gallium is pumped through the branch tube 18 and the tube 17 in this order.
[0022]
If the dross removal performance decreases due to an increase in the amount of dross accumulated in the dross removal device 28, the three-way switching valves 21 and 23 are switched to allow liquid gallium to pass through the branch tube 19 and pass through the branch tube 18. The state is not allowed. Then, liquid gallium stored in a raw material tank (not shown) is passed through the tubes 17 and 19 in order and pumped, introduced into a dross removing device 29 provided in the branch tube 19 to remove dross, and liquid after dross removal. Gallium is pumped through the branch tube 19 and the tube 17 in this order. On the other hand, while removing the dross by the dross removing device 29, the dross is discharged from the dross removing device 28 to recover the dross removing performance. When the dross removal performance decreases due to an increase in the amount of dross accumulated in the dross removal device 29, the three-way switching valves 21 and 23 are switched again to allow liquid gallium to pass through the branch tube 18, and the dross removal performance is improved. Dross removal is performed by the recovered dross removing device 28.
[0023]
According to the dross removal system 15, since the liquid gallium is selectively allowed to flow into the branch tubes 18 and 19, there is no need to interrupt the liquid gallium pumping and dross removal when the dross is discharged, and the operation efficiency is improved. Is good. Further, since the dross removing performance of the dross removing devices 28 and 29 can be restored alternately, the dross removing performance can always be maintained high.
[0024]
In addition, although the case where it has the two branch tubes 18 and 19 each provided with the dross removal apparatus was demonstrated, of course, a branch tube may be formed in three or more and a dross removal apparatus may be provided in each branch flow path. .
[0025]
【Example】
An experiment was conducted to verify the effect of the dross removing apparatus 1. First, the liquid gallium was pumped to the refining tank by the tube 3 without the dross removing apparatus 1 shown in FIG. 1, and the weight of the dross collected from the liquid gallium stored in the refining tank was measured. The results are shown in Table 1. Next, the liquid gallium was pumped to the refining tank by the tube 3 having the dross removing device 1 interposed therebetween, and the weight of the dross collected from the liquid gallium stored in the refining tank was measured. The results are shown in Table 2. In Tables 1 and 2, the raw material weight is the weight of liquid gallium containing dross before being pumped by the tube 3. The dross weight is the weight of dross collected from the liquid gallium stored in the refining tank after being pumped by the tube 3. The ratio is the ratio of dross weight to raw material weight.
[0026]
[Table 1]
Figure 0004500486
[0027]
[Table 2]
Figure 0004500486
[0028]
As can be seen from the results of Tables 1 and 2, when the dross removal device 1 was not installed (before the dross removal device was installed), about 2.3 kg of dross was collected from the refining tank. On the other hand, when the dross removing apparatus 1 was installed (after the dross removing apparatus was installed), about 0.6 kg of dross was collected from the refining tank. That is, it is confirmed that dross generated in the refining tank is reduced to about ¼ compared with the case where the dross removing device 1 is not installed. From the above results, it has been clarified that dross can be effectively removed from the liquid gallium being fed by providing the dross removing device 1.
[0029]
In addition, as a result of visually observing the dross floating on the liquid gallium liquid surface in the refining tank before collecting the dross, when the dross removing device 1 is installed, it is more sponge-like than when it is not installed. It was confirmed that dross decreased significantly. Therefore, it became clear that sponge-like dross can be removed particularly effectively.
[0030]
【The invention's effect】
According to the present invention, dross can be efficiently removed from the molten metal. Furthermore, work efficiency such as metal refining and operation efficiency are improved. In addition, dross mixed in the cast product can be greatly reduced, and defects can be suppressed.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a dross removing apparatus.
FIG. 2 is a circuit diagram showing an outline of a dross removal system.
[Explanation of symbols]
S1 upstream side S2 downstream side 1 dross removal device 3 tube 5 hot water reservoir 6 upper lid 7 partition plate 8 outlet 10 discharge path 15 dross removal system 17 tube 18, 19 branch tube 21, 23 three-way switching valve 28, 29 dross removal apparatus

Claims (3)

金属溶湯が圧送される加圧状態の流路の途中に前記流路より低圧状態となる湯溜め部が介設され,前記湯溜め部を上流側と下流側に仕切る仕切り板を設け,前記流路は前記湯溜め部の上流側と下流側にそれぞれ接続され,
前記仕切り板の下部に金属溶湯を通過させる通口を設けたことを特徴とする,ドロス除去装置。
Hot water reservoir comprising a lower pressure than the flow path is interposed in the middle of the flow path of the pressurized state the molten metal is pumped is provided with a partition plate for partitioning the hot water reservoir on the upstream side and the downstream side, the flow The path is connected to the upstream side and the downstream side of the hot water reservoir,
A dross removing device, characterized in that a passage through which the molten metal passes is provided at a lower portion of the partition plate.
前記湯溜め部の底部に,ドロスを排出する排出路を設けたことを特徴とする,請求項1に記載のドロス除去装置。  The dross removing apparatus according to claim 1, wherein a discharge passage for discharging dross is provided at a bottom of the hot water reservoir. 金属溶湯が圧送される複数の加圧状態の流路に,請求項1又は2に記載のドロス除去装置をそれぞれ設け,
金属溶湯を分岐させて前記各流路に対して選択的に流す切換弁および前記各流路を流れる金属溶湯を合流させる切換弁を設けたことを特徴とする,ドロス除去システム。
The dross removing device according to claim 1 or 2 is provided in each of a plurality of pressurized flow paths through which the molten metal is pumped,
A dross removal system comprising a switching valve for branching a molten metal and selectively flowing the molten metal and a switching valve for merging the molten metal flowing through the channels .
JP2002265490A 2002-09-11 2002-09-11 Dross removal device and dross removal system Expired - Fee Related JP4500486B2 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5726131A (en) * 1980-06-12 1982-02-12 Union Carbide Corp Apparatus for refining molten metal
JPS58144438A (en) * 1982-02-18 1983-08-27 Sumitomo Alum Smelt Co Ltd Method of refining aluminum molten metal and apparatus therefor
JPS63199830A (en) * 1987-02-14 1988-08-18 Nippon Light Metal Co Ltd Method for filtering molten aluminum
JPH0290646U (en) * 1988-12-26 1990-07-18
JPH03229845A (en) * 1990-02-05 1991-10-11 Furukawa Electric Co Ltd:The Hot dip tin coating or solder plating device
JPH04203209A (en) * 1990-11-28 1992-07-23 Hino Motors Ltd Engine exhaust gas removing device
JP2000273600A (en) * 1999-03-25 2000-10-03 Nisshin Steel Co Ltd Method and device for removing dross

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5726131A (en) * 1980-06-12 1982-02-12 Union Carbide Corp Apparatus for refining molten metal
JPS58144438A (en) * 1982-02-18 1983-08-27 Sumitomo Alum Smelt Co Ltd Method of refining aluminum molten metal and apparatus therefor
JPS63199830A (en) * 1987-02-14 1988-08-18 Nippon Light Metal Co Ltd Method for filtering molten aluminum
JPH0290646U (en) * 1988-12-26 1990-07-18
JPH03229845A (en) * 1990-02-05 1991-10-11 Furukawa Electric Co Ltd:The Hot dip tin coating or solder plating device
JPH04203209A (en) * 1990-11-28 1992-07-23 Hino Motors Ltd Engine exhaust gas removing device
JP2000273600A (en) * 1999-03-25 2000-10-03 Nisshin Steel Co Ltd Method and device for removing dross

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