JPH08311628A - Device for removing dross in hot dip metal coating bath - Google Patents
Device for removing dross in hot dip metal coating bathInfo
- Publication number
- JPH08311628A JPH08311628A JP11943495A JP11943495A JPH08311628A JP H08311628 A JPH08311628 A JP H08311628A JP 11943495 A JP11943495 A JP 11943495A JP 11943495 A JP11943495 A JP 11943495A JP H08311628 A JPH08311628 A JP H08311628A
- Authority
- JP
- Japan
- Prior art keywords
- dross
- plating bath
- molten metal
- bath
- plating
- 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
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、溶融金属めっき浴中の
ドロス除去装置に係り、鋼板にめっきする溶融亜鉛や溶
融アルミニウム、溶融すず、溶融銅、溶融ハンダ等の溶
融金属の品質を確保するためにめっき浴中の溶融金属と
ドロスとを分離するドロス除去装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dross removing device in a molten metal plating bath, and secures the quality of molten metal such as molten zinc or molten aluminum, molten tin, molten copper or molten solder for plating a steel sheet. Therefore, the present invention relates to a dross removing device for separating molten metal and dross in a plating bath.
【０００２】[0002]
【従来の技術】従来、鋼板の表面に例えば亜鉛めっきを
施す方法の一つとして、一般に、溶融亜鉛を主成分とす
るめっき浴中に鋼板を連続的にどぶ漬けする、いわゆる
溶融亜鉛めっきがある。このめっき浴中には添加剤であ
るアルミニウムや鋼板から溶け出した鉄分等が含まれる
が、これらの成分が金属間化合物となっていわゆるドロ
スと呼ばれる粒子状不純物を生成する。2. Description of the Related Art Conventionally, as one of the methods for galvanizing the surface of a steel sheet, generally, there is so-called hot dip galvanizing in which the steel sheet is continuously dipped in a plating bath containing molten zinc as a main component. . The plating bath contains aluminum as an additive, iron dissolved from a steel plate, and the like, and these components become intermetallic compounds to generate particulate impurities called so-called dross.
【０００３】このドロスはトップドロスとボトムドロス
とに大別される。トップドロスはアルミの含有比率が高
いことから比重が軽く、めっき浴の上部に位置し、ボト
ムドロスは鉄の含有比率が高いことから比重が重く、め
っき浴の下部に位置する。めっき浴中のドロス量が増え
ると、めっきの品質が著しく損なわれるので、めっき浴
中からドロスを除去する必要がある。This dross is roughly classified into a top dross and a bottom dross. The top dross has a high specific gravity due to its high aluminum content, and is located above the plating bath. The bottom dross has a high specific gravity due to its high iron content and is located below the plating bath. If the amount of dross in the plating bath increases, the quality of the plating will be significantly impaired, so it is necessary to remove the dross from the plating bath.
【０００４】このドロスを除去する方法として、例えば
図２に示すようなドロス分離槽が用いられている（例え
ば、特開平６−248405号公報参照）。この図において、
１は溶融金属めっき浴（以下、単にめっき浴という）２
を収容するめっきポットで、スナウト３を介して導き入
れられた鋼板Ｓがシンクロール４を経ながら連続的に溶
融金属めっきが施される。５はめっきポット１内にその
上方からほぼ垂直に挿入されてめっき浴２を吸い上げる
吸い上げ管で、めっき浴ポンプ６が接続される。As a method for removing this dross, for example, a dross separation tank as shown in FIG. 2 is used (see, for example, JP-A-6-248405). In this figure,
1 is a molten metal plating bath (hereinafter, simply referred to as a plating bath) 2
In the plating pot that accommodates the steel plate S, the steel plate S introduced through the snout 3 is continuously subjected to hot metal plating while passing through the sink roll 4. Reference numeral 5 denotes a suction pipe which is vertically inserted into the plating pot 1 from above and sucks up the plating bath 2, to which a plating bath pump 6 is connected.
【０００５】７はドロス分離槽で、複数枚の上邪魔板８
と下邪魔板９とが所定の間隔で交互に取り付けられる。
10はドロス分離槽７の一端に取り付けられるめっき浴流
入管で、吸い上げ管５の端部が接続される。11はドロス
分離槽７の他端に取り付けられるめっき浴排出管で、め
っきポット１内に連結される戻り管12が接続される。そ
して、めっき浴ポンプ６で吸い上げられてめっき浴流入
管10から供給されためっき浴２は、ドロス分離槽７にお
いて順次上邪魔板８と下邪魔板９の間をくぐり抜ける際
に、槽内のめっき浴２中にトップドロスＡを浮遊させる
とともにボトムドロスＢを沈澱堆積させる。これらトッ
プドロスＡ、ボトムドロスＢの除去された清浄なめっき
浴２はめっき浴排出管11から戻り管12を介してめっきポ
ット１内に戻される。Reference numeral 7 is a dross separation tank, and a plurality of upper baffles 8
The lower baffle plate 9 and the lower baffle plate 9 are attached alternately at a predetermined interval.
Reference numeral 10 is a plating bath inflow pipe attached to one end of the dross separation tank 7, to which the end of the suction pipe 5 is connected. Reference numeral 11 is a plating bath discharge pipe attached to the other end of the dross separation tank 7, and a return pipe 12 connected to the inside of the plating pot 1 is connected thereto. Then, when the plating bath 2 sucked up by the plating bath pump 6 and supplied from the plating bath inflow pipe 10 passes through between the upper baffle plate 8 and the lower baffle plate 9 in the dross separation tank 7 in sequence, the plating bath 2 is plated in the tank. The top dross A is suspended in the bath 2 and the bottom dross B is deposited. The clean plating bath 2 from which these top dross A and bottom dross B have been removed is returned from the plating bath discharge pipe 11 to the inside of the plating pot 1 via the return pipe 12.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記し
たドロス分離槽７は複数枚の上下邪魔板８，９を用いる
ことによってトップドロスＡ、ボトムドロスＢを高効率
で分離除去することを狙ったものであるが、さらに分離
効率を高めようとして邪魔板の枚数を増やすと、めっき
浴２の流路が狭くなって、流速が上がってかえって分離
効率が悪くなるという欠点があった。この欠点を補おう
として槽を大型化すると設備費が嵩むという別の新たな
問題が生じることになる。However, the above-mentioned dross separating tank 7 aims at separating and removing the top dross A and the bottom dross B with high efficiency by using a plurality of upper and lower baffles 8 and 9. However, if the number of baffle plates is increased in order to further increase the separation efficiency, the flow path of the plating bath 2 becomes narrower and the flow rate increases, which rather deteriorates the separation efficiency. If the tank is enlarged in order to compensate for this drawback, another new problem arises that the equipment cost increases.
【０００７】なお、例えば特開平４− 99258号公報に
は、めっきポット底部周辺から溶融亜鉛めっき浴をポン
プで汲み出してサブポット（ドロス分離槽）に送り込
み、高温に保持するとともにAl濃度を0.14重量％以上に
高め、ボトムドロスをトップドロスとして浮上させて除
去するという槽内の流れを制御する邪魔板などを用いな
い方法が開示されているが、大きな容積を必要とするに
もかかわらず分離性能がよくないという問題がある。[0007] For example, in Japanese Unexamined Patent Publication No. 4-99258, a hot dip galvanizing bath is pumped out from the periphery of the bottom of a plating pot and sent to a subpot (dross separation tank) where it is kept at a high temperature and the Al concentration is 0.14% by weight. A method has been disclosed that does not use a baffle to control the flow in the tank by raising the bottom dross as a top dross and removing it, but the separation performance is good despite the large volume required. There is a problem that there is no.
【０００８】本発明は、上記のような従来技術の有する
課題を解決すべくなされたものであって、邪魔板等を用
いたドロス分離槽よりも大きな分離性能を備えた溶融金
属めっき浴中のドロス除去装置を提供することを目的と
する。The present invention has been made to solve the problems of the prior art as described above, and is intended for use in a molten metal plating bath having a separation performance greater than that of a dross separation tank using a baffle plate or the like. An object is to provide a dross removing device.
【０００９】[0009]
【課題を解決するための手段】本発明は、溶融金属めっ
き浴が収容されためっきポット内に、その上方から挿入
して前記めっき浴を吸い上げる吸い上げ管と、該吸い上
げ管によって吸い上げられためっき浴をめっき浴流入管
を介して送給されるドロス分離槽と、該ドロス分離槽に
よってドロスが除去されためっき浴をめっき浴排出管を
介して前記めっきポット内に戻す戻り管とからなる溶融
金属めっき浴中のドロス除去装置において、前記ドロス
分離槽内の底面に複数個の沈澱塊状物を沈澱させるとと
もに、前記ドロス分離槽のめっき浴浴面に複数個の浮遊
塊状物を浮遊させることを特徴とする溶融金属めっき浴
中のドロス除去装置である。DISCLOSURE OF THE INVENTION The present invention is directed to a suction pipe which is inserted from above into a plating pot containing a molten metal plating bath to suck up the plating bath, and a plating bath sucked up by the suction pipe. A molten metal comprising a dross separation tank fed through a plating bath inflow pipe and a return pipe for returning the plating bath from which dross has been removed by the dross separation tank into the plating pot through a plating bath discharge pipe. In a dross removing device in a plating bath, a plurality of precipitated lumps are precipitated on the bottom surface in the dross separation tank, and a plurality of floating lumps are floated on the plating bath surface of the dross separation tank. This is a device for removing dross in a molten metal plating bath.
【００１０】なお、前記沈澱塊状物および浮遊塊状物は
溶融金属に対して難溶性であることが好ましい。It is preferable that the precipitated lump and the floating lump are hardly soluble in molten metal.
【００１１】[0011]
【作 用】本発明によれば、ドロス分離槽内の底面に複
数個の沈澱塊状物を沈澱させ、かつ浴面に複数個の浮遊
塊状物を浮遊させることにより、めっき浴の流れが複雑
な層流流れを起こし、かつ流動距離を大幅に延長させる
ことができるので、トップドロスおよびボトムドロスの
静置分離を促進することが可能となる。[Operation] According to the present invention, the flow of the plating bath is complicated by precipitating a plurality of precipitation agglomerates on the bottom of the dross separation tank and floating a plurality of floating agglomerates on the bath surface. Since a laminar flow can be generated and the flow distance can be greatly extended, it becomes possible to promote the stationary separation of the top dross and the bottom dross.
【００１２】[0012]
【実施例】以下に、本発明の実施例について、図面を参
照して詳しく説明する。図１は本発明の実施例を模式的
に示す側面図であり、図中において従来例と同一部材に
は同一符号を付して説明を省略する。この図に示すよう
に、ドロス分離槽７内のめっき浴排出管11側にはトップ
ドロス堰13が設けられ、かつドロス分離槽７内の底面に
は沈澱塊状物14が複数の層状になるように充填され、ま
ためっき浴の浴面には浮遊塊状物15が複数の層状になる
ように充填される。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a side view schematically showing an embodiment of the present invention. In the figure, the same members as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. As shown in this figure, a top dross weir 13 is provided on the plating bath discharge pipe 11 side in the dross separation tank 7, and a set of precipitation lumps 14 are formed on the bottom surface in the dross separation tank 7 in a plurality of layers. Further, the floating lumps 15 are filled in a plurality of layers on the bath surface of the plating bath.
【００１３】この沈澱塊状物14は溶融金属に対して難溶
性でかつ比重が重い例えば直径が50mmφのモリブデン製
の球（Znの比重7.0 に対しモリブデンの比重は10.2であ
る）が用いられ、浮遊塊状物15としては溶融金属に対し
て難溶性でかつ比重が軽い例えば直径が50mmφの球形状
のカーボン（比重が1.8 ）が用いられる。なお、カーボ
ン以外に溶融金属に対して難溶性な例えばAl2O3 ，TiC
，SiC 等のセラミックスや耐火レンガを用いることも
できる。As the precipitate mass 14, a molybdenum sphere having a diameter of 50 mmφ, which is hardly soluble in molten metal and has a large specific gravity (a specific gravity of Zn is 7.0 and a specific gravity of molybdenum is 10.2) is used. As the agglomerate 15, for example, spherical carbon having a diameter of 50 mmφ (specific gravity 1.8) which is hardly soluble in molten metal and has a low specific gravity is used. In addition to carbon, it is difficult to dissolve in molten metal, such as Al 2 O 3 and TiC.
, SiC or other ceramics or refractory bricks can also be used.
【００１４】また、浮遊塊状物15は溶融金属表面から飛
び出さないように重しをして溶融金属に漬かるようにす
るのが望ましい。また、それらの形状は球形状以外にテ
トラポット形や円柱形、角柱形、不定形等であってもか
まわない。そして、ドロス分離槽７にめっき浴ポンプ６
を介して所定量のめっき浴２を供給し、トップドロス堰
13の下側からめっき浴排出管11にオーバフローした溶融
亜鉛めっき浴２を戻り管12を介してめっきポット１へ戻
すようにする。このとき、槽内においてめっき浴流入管
10から吐出されためっき浴２は、沈澱塊状物14や浮遊塊
状物15と接触して、その流れが複雑な層流流れを起こ
し、かつ流動距離を大幅に延長させる。これによって、
トップドロスＡおよびボトムドロスＢの静置分離を促進
することが可能となる。Further, it is desirable that the floating lump 15 is dipped in the molten metal by weighting it so as not to jump out from the surface of the molten metal. In addition to the spherical shape, those shapes may be a tetrapot shape, a cylindrical shape, a prismatic shape, an amorphous shape, or the like. Then, the plating bath pump 6 is added to the dross separation tank 7.
A predetermined amount of plating bath 2 is supplied via the
The hot dip galvanizing bath 2 overflowed from the lower side of the plating bath 13 to the plating bath discharge pipe 11 is returned to the plating pot 1 via the return pipe 12. At this time, the plating bath inflow pipe in the bath
The plating bath 2 discharged from 10 comes into contact with the precipitated lumps 14 and the floating lumps 15 to cause a complicated laminar flow, and to greatly extend the flow distance. by this,
It becomes possible to promote the stationary separation of the top dross A and the bottom dross B.
【００１５】すなわち、めっき浴２は、沈澱塊状物14が
形成する複雑な流路を通る際に緩やかな流れの中で発生
するよどみや渦による静置分離の促進作用を受けること
によりボトムドロスＢを沈澱・堆積させ、一方、浮遊塊
状物15が同様に形成する複雑な流路を通る際に緩やかな
流れの中で発生するよどみや渦による静置分離の促進作
用を受けることにより、トップドロスＡをめっき浴２の
浴面に浮上・分離させる。That is, the plating bath 2 receives the bottom dross B by being subjected to the action of promoting the stationary separation by the stagnation and vortex generated in the gentle flow when passing through the complicated flow path formed by the precipitation lumps 14. The top dross A is precipitated / deposited, and on the other hand, the suspended mass 15 is subjected to the action of promoting the stationary separation due to the stagnation and vortex generated in the gentle flow when passing through the complicated flow path similarly formed. Are floated and separated on the bath surface of the plating bath 2.
【００１６】寸法が縦；800mm ×横；800mm ×高さ；60
0mm のドロス分離槽７の内部に、沈澱塊状物14として直
径50mmφのモリブデンの球を４層にして堆積し、浮遊塊
状物15として直径50mmφの球形状のカーボンを３層充填
し、溶融亜鉛めっき浴を毎分80リットルの割合で供給し
てドロス分離を行った。約２トンの溶融亜鉛めっき浴を
約１時間循環してトップドロスとボトムドロスを分離し
た。そして、分離運転後の保全作業として人手によって
それぞれのドロスをすくって回収した。その量を測定し
た結果を表１に示した。なお、比較のために、上下邪魔
板をそれぞれ３枚ずつ取り付けた従来のドロス分離槽を
用いて同様の条件でドロス分離を行った結果を表１に併
せて示した。The dimensions are vertical; 800 mm x horizontal; 800 mm x height; 60
Inside the 0 mm dross separating tank 7, 4 layers of molybdenum spheres with a diameter of 50 mmφ were deposited as the precipitated lumps 14 and three layers of spherical carbon with a diameter of 50 mmφ were filled as the floating lumps 15, and hot dip galvanizing was performed. The bath was supplied at a rate of 80 liters per minute for dross separation. The top dross and the bottom dross were separated by circulating a hot dip galvanizing bath of about 2 tons for about 1 hour. Then, as a maintenance work after the separation operation, each dross was manually scooped and collected. The results of measuring the amount are shown in Table 1. For comparison, Table 1 also shows the results of dross separation performed under the same conditions using a conventional dross separation tank in which three upper and lower baffles were attached.
【００１７】[0017]
【表１】 [Table 1]
【００１８】この表から明らかなように、本発明例のド
ロス回収量は従来例のそれに比べてトップドロス、ボト
ムドロスのいずれも２倍強も上回っており、本発明例の
分離性能が格段に高いことがわかる。As is clear from this table, the amount of recovered dross of the inventive example is more than twice as high as that of the conventional example in both the top dross and the bottom dross, and the separation performance of the inventive example is remarkably high. I understand.
【００１９】[0019]
【発明の効果】以上説明したように、本発明によれば、
沈澱塊状物および浮遊塊状物を充填させたドロス分離槽
を用いてドロス分離を行うようにしたので、以下のよう
な効果を奏するものである。 同一寸法のドロス分離槽の場合で、邪魔板を用いた
従来例の分離性能を大幅に上回る分離性能が得られるこ
と。 清浄な溶融金属めっき浴を得るとともに、無駄のな
いドロス除去を行うことができること。 清浄な溶融金属めっき浴が得られることから、より
品質の高いめっき鋼板を製造することができること。 清浄な溶融金属めっき浴が得られることから、浴中
機器の寿命の延長が可能になること。As described above, according to the present invention,
Since the dross separation is performed using the dross separation tank filled with the precipitated lumps and the floating lumps, the following effects can be obtained. In the case of dross separation tanks of the same size, a separation performance that greatly exceeds the separation performance of the conventional example using a baffle plate can be obtained. Able to obtain a clean molten metal plating bath and remove dross without waste. Since a clean molten metal plating bath can be obtained, it is possible to manufacture a higher quality plated steel sheet. Since a clean molten metal plating bath can be obtained, it is possible to extend the life of equipment in the bath.
【図１】本発明の実施例を模式的に示す側断面図であ
る。FIG. 1 is a side sectional view schematically showing an embodiment of the present invention.
【図２】従来例を模式的に示す側断面図である。FIG. 2 is a side sectional view schematically showing a conventional example.
１ めっきポット ２ めっき浴（溶融金属めっき浴） ３ スナウト ４ シンクロール ５ 吸い上げ管 ６ めっき浴ポンプ ７ ドロス分離槽 ８ 上邪魔板 ９ 下邪魔板 10 めっき浴流入管 11 めっき浴排出管 12 戻り管 13 トップドロス堰 14 沈澱塊状物 15 浮遊塊状物 Ａ トップドロス Ｂ ボトムドロス Ｓ 鋼板 1 plating pot 2 plating bath (molten metal plating bath) 3 snout 4 sink roll 5 suction pipe 6 plating bath pump 7 dross separation tank 8 upper baffle plate 9 lower baffle plate 10 plating bath inflow pipe 11 plating bath discharge pipe 12 return pipe 13 Top dross weir 14 Precipitated agglomerate 15 Floating agglomerate A Top dross B Bottom dross S Steel plate
Claims (2)
ポット内に、その上方から挿入して前記めっき浴を吸い
上げる吸い上げ管と、該吸い上げ管によって吸い上げら
れためっき浴をめっき浴流入管を介して送給されるドロ
ス分離槽と、該ドロス分離槽によってドロスが除去され
ためっき浴をめっき浴排出管を介して前記めっきポット
内に戻す戻り管とからなる溶融金属めっき浴中のドロス
除去装置において、 前記ドロス分離槽内の底面に複数個の沈澱塊状物を沈澱
させるとともに、前記ドロス分離槽のめっき浴浴面に複
数個の浮遊塊状物を浮遊させることを特徴とする溶融金
属めっき浴中のドロス除去装置。1. A suction pipe which is inserted from above into a plating pot containing a molten metal plating bath to suck up the plating bath, and a plating bath sucked up by the suction pipe through a plating bath inflow pipe. In a dross removing device in a molten metal plating bath, which comprises a dross separation tank to be fed and a return pipe for returning the plating bath from which the dross has been removed to the inside of the plating pot via a plating bath discharge pipe. In a molten metal plating bath, a plurality of precipitated lumps are precipitated on the bottom surface of the dross separation tank, and a plurality of floating lumps are floated on the bath surface of the dross separation tank. Dross removing device.
融金属に対して難溶性であることを特徴とする請求項１
記載の溶融金属めっき浴中のドロス除去装置。2. The precipitated agglomerate and the suspended agglomerate are hardly soluble in molten metal.
The dross removing device in the molten metal plating bath described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11943495A JPH08311628A (en) | 1995-05-18 | 1995-05-18 | Device for removing dross in hot dip metal coating bath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11943495A JPH08311628A (en) | 1995-05-18 | 1995-05-18 | Device for removing dross in hot dip metal coating bath |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08311628A true JPH08311628A (en) | 1996-11-26 |
Family
ID=14761336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11943495A Pending JPH08311628A (en) | 1995-05-18 | 1995-05-18 | Device for removing dross in hot dip metal coating bath |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08311628A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100312130B1 (en) * | 1997-11-01 | 2001-12-20 | 이구택 | Method for removing impurities of hot dip galvanizing bath |
| KR100792753B1 (en) * | 2001-11-12 | 2008-01-11 | 주식회사 포스코 | Sediment removing apparatus of liquid tank |
| JP2010209439A (en) * | 2009-03-12 | 2010-09-24 | Jfe Steel Corp | Method for removing dross in hot-dip galvanizing bath |
-
1995
- 1995-05-18 JP JP11943495A patent/JPH08311628A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100312130B1 (en) * | 1997-11-01 | 2001-12-20 | 이구택 | Method for removing impurities of hot dip galvanizing bath |
| KR100792753B1 (en) * | 2001-11-12 | 2008-01-11 | 주식회사 포스코 | Sediment removing apparatus of liquid tank |
| JP2010209439A (en) * | 2009-03-12 | 2010-09-24 | Jfe Steel Corp | Method for removing dross in hot-dip galvanizing bath |
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