JPH07207418A - Bottom dross removing device in hot-dip galvanizing bath in hot-dip galvanizing line - Google Patents
Bottom dross removing device in hot-dip galvanizing bath in hot-dip galvanizing lineInfo
- Publication number
- JPH07207418A JPH07207418A JP223594A JP223594A JPH07207418A JP H07207418 A JPH07207418 A JP H07207418A JP 223594 A JP223594 A JP 223594A JP 223594 A JP223594 A JP 223594A JP H07207418 A JPH07207418 A JP H07207418A
- Authority
- JP
- Japan
- Prior art keywords
- bath
- dross
- dip galvanizing
- hot
- zinc bath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000005246 galvanizing Methods 0.000 title claims abstract description 17
- 239000011701 zinc Substances 0.000 claims abstract description 24
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 23
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 abstract description 24
- 239000010959 steel Substances 0.000 abstract description 24
- 238000007747 plating Methods 0.000 abstract description 18
- 239000012535 impurity Substances 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 abstract description 4
- 210000004894 snout Anatomy 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 238000005275 alloying Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Coating With Molten Metal (AREA)
Abstract
(57)【要約】
【目的】 鋼板がスナウト部を通ってめっき浴に浸漬さ
れる際、めっき浴槽底部のボトムドロスの回収とトップ
ドロスの発生を防止することによって、美麗なめっき鋼
板を得る装置を提供すること。
【構成】 溶融亜鉛浴槽内に吸引ポンプを設けると共
に、該吸引ポンプを囲むように側面に開口を有する静定
槽を亜鉛浴面下に沈めて設け、亜鉛浴底付近に該吸引ポ
ンプの吸引口を配設した溶融亜鉛浴槽内ボトムドロス除
去装置。
【効果】 ボトムドロス回収時に静定槽に発生するトッ
プドロスの発生を完全に抑えることが出来、溶融亜鉛め
っきラインにおける亜鉛浴内の不純物の巻き上げを減少
させ、ドロスがめっき鋼板に付着することなく、美麗な
めっき鋼板を得ることが可能となった。
(57) [Summary] [Purpose] When a steel sheet is immersed in a plating bath through a snout portion, a device for obtaining a beautiful plated steel sheet by collecting bottom dross at the bottom of the plating bath and preventing the occurrence of top dross is provided. To provide. [Composition] A suction pump is provided in the molten zinc bath, and a stationary tank having an opening on the side so as to surround the suction pump is provided under the zinc bath surface, and the suction port of the suction pump is provided near the bottom of the zinc bath. A bottom dross removing device in a molten zinc bath in which is installed. [Effect] It is possible to completely suppress the generation of top dross that occurs in the static bath during bottom dross recovery, reduce the rolling up of impurities in the zinc bath in the hot dip galvanizing line, and prevent the dross from adhering to the plated steel sheet. It has become possible to obtain beautiful plated steel sheets.
Description
【０００１】[0001]
【産業上の利用分野】本発明は溶融亜鉛めっきラインに
おける溶融亜鉛浴槽内ボトムドロス除去装置に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom dross removing device in a hot dip galvanizing bath in a hot dip galvanizing line.
【０００２】[0002]
【従来の技術】従来、溶融金属めっき法としては、被め
っき鋼板を加熱焼鈍した後上部が焼鈍炉に接続し、下端
が溶融金属めっき浴に浸漬されたスナウトの内部を通
り、溶融金属めっき浴中に浸漬され、浴中のポットロー
ルにより進行方向を変えて上方に引上げ、気体絞り法に
より溶融金属めっきの付着量を制御し溶融金属めっき鋼
板を得る方法がある。このような溶融亜鉛めっき工程に
おいて、亜鉛浴内で不純物であるボトムドロスがめっき
鋼板に付着し、めっき鋼板の外観を損なうことが良く知
られている。2. Description of the Related Art Conventionally, as a hot dip metal plating method, a steel sheet to be plated is heated and annealed, an upper part thereof is connected to an annealing furnace, and a lower end thereof is passed through an inside of a snout immersed in the hot dip metal plating bath to form a hot dip metal bath. There is a method of obtaining a hot-dip metal-plated steel sheet by immersing it inside, changing the direction of travel by a pot roll in a bath and pulling it upward, and controlling the amount of hot-dip metal plating adhered by a gas drawing method. It is well known that, in such a hot dip galvanizing process, bottom dross, which is an impurity, adheres to the plated steel sheet in the zinc bath and impairs the appearance of the plated steel sheet.
【０００３】これらの問題を解消するために、従来、こ
のボトムドロスに対し、例えば特開平４−２３２２３５
号公報に示されるように、溶融亜鉛めっきラインの亜鉛
浴内でポットロールとは反対側の側部に筒体を立設し、
この筒体内下部に多孔質耐火物を設け、この多孔質耐火
物に外部から気体導入用パイプを連通させ、ポットロー
ル下方の亜鉛浴底部には開口部を有する吸引ダクトを設
け、かつ吸引ダクトと筒体の底部を導管で連通し、筒体
近傍にはポットロールとの間に仕切板を立設した溶融亜
鉛浴内の浴底堆積不純物除去装置。すなわち、溶融亜鉛
浴底に堆積するボトムドロスに対し、ガスリフトポンプ
でボトムドロスを吸引し、ガスリフトポンプを囲う側面
に開口を有する筒体にボトムドロスを堆積させる技術が
報告されている。In order to solve these problems, the bottom dross is conventionally dealt with by, for example, Japanese Patent Laid-Open No. 4-232235.
As shown in Japanese Patent Publication, a tube is erected on the side opposite to the pot roll in the zinc bath of the hot dip galvanizing line,
A porous refractory is provided in the lower part of the cylinder, a gas introducing pipe is communicated with the porous refractory from the outside, and a suction duct having an opening is provided at the bottom of the zinc bath below the pot roll, and the suction duct is connected to the suction duct. A device for removing impurities accumulated in the bath bottom in a molten zinc bath, in which the bottom of the cylinder is connected by a conduit and a partition plate is erected between the cylinder and the pot roll near the cylinder. That is, with respect to bottom dross that accumulates on the bottom of the molten zinc bath, a technique has been reported in which the bottom dross is sucked by a gas lift pump and the bottom dross is accumulated on a cylinder having an opening on the side surface surrounding the gas lift pump.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上述した特開
平４−２３２２３５号公報にあっては、ボトムドロスを
回収中に、筒体内に亜鉛が次々と流入するために、亜鉛
が空気に触れるためにトップドロスの発生量が装置未使
用時よりも多くなる。従って、ボトムドロスは解消され
るももの、トップドロスの発生により、このトップドロ
スがめっき鋼板に付着し、めっき鋼板の外観を損なう結
果となる。本発明は、このような問題に鑑みてなされた
もので、ポンプ方式をガスリフトポンプから、モーター
駆動のポンプに変更して静定槽を完全に亜鉛浴中に沈め
ることにより、ボトムドロスの回収とトップドロスの発
生を防止し、美麗なめっき鋼板を得ることを目的とする
ものである。However, in the above-mentioned Japanese Patent Laid-Open No. 4-232235, during recovery of bottom dross, zinc flows into the cylinder one after another, so that zinc comes into contact with air. The amount of top dross generated is higher than when the device is not used. Therefore, although the bottom dross is eliminated, the top dross adheres to the plated steel sheet due to the generation of the top dross, resulting in the appearance of the plated steel sheet being impaired. The present invention has been made in view of such a problem, and by changing the pump system from a gas lift pump to a motor-driven pump and completely submerging the stationary tank in a zinc bath, recovery of bottom dross and top The purpose is to prevent the generation of dross and obtain a beautiful plated steel sheet.
【０００５】[0005]
【課題を解決するための手段】本発明は、上述したよう
な目的を達成するためのものであって、その発明の要旨
とするところは、溶融亜鉛浴槽内に吸引ポンプを設ける
と共に、該吸引ポンプを囲むように側面に開口を有する
静定槽を亜鉛浴面下に沈めて設け、亜鉛浴底付近に該吸
引ポンプの吸引口を配設したことを特徴とする溶融亜鉛
めっきラインにおける溶融亜鉛浴槽内ボトムドロス除去
装置にある。DISCLOSURE OF THE INVENTION The present invention is to achieve the above-mentioned object, and the gist of the invention is to provide a suction pump in a molten zinc bath and to provide the suction pump. A hot dip galvanizing line in a hot dip galvanizing line, characterized in that a stationary tank having an opening on the side so as to surround the pump is provided below the zinc bath surface, and a suction port of the suction pump is provided near the bottom of the zinc bath. It is in the bottom dross removing device in the bathtub.
【０００６】以下、本発明について図面に従って詳細に
説明する。図１は本発明に係る溶融亜鉛めっきラインに
おける溶融亜鉛浴槽内ボトムドロス除去装置の概要図で
ある。連続溶融金属めっき装置では、図１に示すよう
に、連続焼鈍炉から出た鋼板１がスナウト２内を通って
めっき浴槽３内のめっき浴中に浸漬された後ポットロー
ル５を経てめっき浴４外へ引き出され、更に浴外のガス
ワイピングノズル６にて表面に余剰に付着しためっき層
が払拭されて、鋼板１表面に所定厚みのめっきが施され
る。その後合金化処理される場合には合金化加熱装置が
配設される。The present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram of a bottom dross removing device in a hot dip galvanizing bath in a hot dip galvanizing line according to the present invention. In the continuous hot-dip galvanizing apparatus, as shown in FIG. 1, a steel plate 1 discharged from a continuous annealing furnace passes through a snout 2 and is immersed in a plating bath in a plating bath 3 and then passes through a pot roll 5 and a plating bath 4 Then, the gas wiping nozzle 6 outside the bath wipes off the excess plating layer on the surface, and the surface of the steel plate 1 is plated with a predetermined thickness. When the alloying treatment is performed thereafter, an alloying heating device is provided.
【０００７】[0007]
【作用】ところで、溶融亜鉛めっきにおいては鋼板によ
り炉内から運ばれてくる鉄粉ＦｅとＺｎが反応してＦｅ
Ｚｎ7 を形成し、いわゆるボトムドロスとして浴槽底部
に堆積する。更には鋼板により炉内から運ばれた異物は
全て鋼板の浴中侵入により引き起こされた鋼板側への表
面流れによって鋼板近傍へと搬送され進行中の鋼板に付
着すると同時にシンクロールによってボトムドロスを巻
き上げ、進行中の鋼板に付着する。その結果不めっきや
ドロス付着による押込疵等のめっき欠陥が生ずる。たと
えこれらの大きな原因とならない場合であっても、めっ
き鋼板の外観を損なうという問題を生ずる。By the way, in hot dip galvanizing, iron powder Fe and Zn carried from the furnace by the steel plate react with each other to form Fe.
Zn 7 is formed and deposited on the bottom of the bath as so-called bottom dross. Furthermore, all the foreign substances carried from the furnace by the steel plate are transported to the vicinity of the steel plate by the surface flow toward the steel plate side caused by the invasion of the steel plate in the bath and adhere to the steel plate in progress, and at the same time the bottom dross is wound up by the sink roll, Adheres to the steel plate in progress. As a result, plating defects such as indentation defects due to non-plating and dross adhesion occur. Even if it is not a major cause of these problems, it causes a problem of impairing the appearance of the plated steel sheet.
【０００８】図１は上述した工程を経るものであるが、
このような工程において、めっき浴槽３底部のボトムド
ロス１０を吸引ダクトを設け、ポットロール５下部に堆
積したボトムドロス１０を吸い込み、持ち上げ除去する
ものである。また、静定槽７を亜鉛浴中に完全に沈めて
配設し、しかも静定槽７は上面に開閉可能な蓋８を設け
る。そして吸引ポンプ９をモーター１２により稼働させ
るとボトムドロス１０は吸引口１１より静定槽７内に移
動し静定槽上方まで持ち上げた後下降させ静定槽の下部
に堆積させる。この時静定槽７内は、密封されているこ
とからトップドロスの発生を完全に防止させることが出
来る。Although FIG. 1 shows the steps described above,
In such a process, the bottom dross 10 at the bottom of the plating bath 3 is provided with a suction duct, and the bottom dross 10 accumulated at the bottom of the pot roll 5 is sucked and lifted and removed. Further, the stationary tank 7 is disposed by being completely immersed in the zinc bath, and the stationary tank 7 is provided with a lid 8 which can be opened and closed on the upper surface. When the suction pump 9 is operated by the motor 12, the bottom dross 10 moves from the suction port 11 into the stationary tank 7, is lifted to the upper side of the stationary tank, and is lowered to be deposited on the lower part of the stationary tank. At this time, since the interior of the stationary tank 7 is sealed, it is possible to completely prevent the generation of top dross.
【０００９】更に、静定槽７上の蓋８を開き、静定槽７
内にＡｌを添加して静定槽７内を窒素ガスでバブリング
を行うことにより、静定槽７内下部に堆積したボトムド
ロス１０はこのＡｌとＦｅとが反応してＦｅ2 Ａｌ5 を
形成し、いわゆるトップドロスとして浴面上に浮遊さ
せ、亜鉛浴上部内からボトムドロスを除去するものであ
る。Further, the lid 8 on the stationary tank 7 is opened to open the stationary tank 7.
By adding Al to the inside and bubbling the inside of the stationary tank 7 with nitrogen gas, the bottom dross 10 accumulated in the lower portion of the stationary tank 7 reacts with Al and Fe to form Fe 2 Al 5. The so-called top dross is floated on the bath surface to remove the bottom dross from the upper part of the zinc bath.
【００１０】[0010]
【実施例】図１に示すように、ポットロール下部のめっ
き槽浴底部に開口部を有する吸引ダクトを設け、この吸
引ダクトを静定槽底部に導管で連通することにより、吸
引ポンプにより上昇流を形成させてポットロール下部に
堆積したボトムドロスを吸い込み、静定槽上方までボト
ムドロスを持ち上げ下降させる。そしてこの静定槽の底
部に堆積したボトムドロスを静定槽の蓋を開いてＡｌを
投入して、ボトムドロスをＡｌと反応させてトップドロ
スとして浴面上に浮遊させ、静定槽の上部より、このト
ップドロスとして除去する。このようにして、めっき浴
槽での広範囲に渡るボトムドロスを吸引し除去すること
が可能となった。その結果、めっき浴槽内での鋼板によ
って巻き上げられる堆積不純物が減少し、鋼板への付着
を防止することが出来た。EXAMPLE As shown in FIG. 1, a suction duct having an opening is provided at the bottom of the bath in the bottom of the pot roll, and this suction duct is connected to the bottom of the stationary tank by a conduit so that an upward flow is generated by a suction pump. The bottom dross accumulated on the lower part of the pot roll is sucked up, and the bottom dross is lifted and lowered to the upper side of the stationary tank. Then, the bottom dross accumulated on the bottom of this stationary tank is opened by opening the lid of the stationary tank, Al is introduced, and the bottom dross reacts with Al to float on the bath surface as top dross. From the upper part of the stationary tank, Remove as this top dross. In this way, it became possible to suck and remove a wide range of bottom dross in the plating bath. As a result, the accumulated impurities rolled up by the steel plate in the plating bath were reduced, and adhesion to the steel plate could be prevented.
【００１１】[0011]
【発明の効果】以上述べたように、本発明によるめっき
浴底堆積不純物除去装置によれば、ボトムドロス回収時
に静定槽内に発生するトップドロスを完全に抑えること
が出来、溶融亜鉛めっきラインにおける亜鉛浴内の不純
物の巻き上げを減少させることが可能となり、従って、
ドロスがめっき鋼板に付着することなく、美麗なめっき
外観を得ることが出来る優れた効果を奏するものであ
る。As described above, according to the apparatus for removing impurities deposited at the bottom of a plating bath according to the present invention, it is possible to completely suppress the top dross generated in the static bath during the recovery of the bottom dross. It is possible to reduce the rolling up of impurities in the zinc bath and thus
It has an excellent effect that a beautiful plating appearance can be obtained without dross adhering to the plated steel sheet.
【図１】本発明に係る溶融亜鉛めっきラインにおける溶
融亜鉛浴槽内ボトムドロス除去装置の概要図である。FIG. 1 is a schematic diagram of a bottom dross removing device in a hot dip galvanizing bath in a hot dip galvanizing line according to the present invention.
１ 鋼板 ２ スナウト ３ めっき浴槽 ４ めっき浴 ５ ポットロール ６ ガスワイピングノズル ７ 静定槽 ８ 蓋 ９ 吸引ポンプ １０ ボトムドロス １１ 吸引口 １２ モーター 1 Steel Plate 2 Snout 3 Plating Bath 4 Plating Bath 5 Pot Roll 6 Gas Wiping Nozzle 7 Stationary Tank 8 Lid 9 Suction Pump 10 Bottom Dross 11 Suction Port 12 Motor
Claims (1)
共に、該吸引ポンプを囲むように側面に開口を有する静
定槽を亜鉛浴面下に沈めて設け、亜鉛浴底付近に該吸引
ポンプの吸引口を配設したことを特徴とする溶融亜鉛め
っきラインにおける溶融亜鉛浴槽内ボトムドロス除去装
置。1. A suction pump is provided in a molten zinc bath, and a stationary tank having an opening on a side so as to surround the suction pump is provided below the zinc bath surface, and the suction pump is provided near the bottom of the zinc bath. A bottom dross removing device in a hot dip galvanizing bath in a hot dip galvanizing line, which is provided with a suction port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP223594A JPH07207418A (en) | 1994-01-13 | 1994-01-13 | Bottom dross removing device in hot-dip galvanizing bath in hot-dip galvanizing line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP223594A JPH07207418A (en) | 1994-01-13 | 1994-01-13 | Bottom dross removing device in hot-dip galvanizing bath in hot-dip galvanizing line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07207418A true JPH07207418A (en) | 1995-08-08 |
Family
ID=11523696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP223594A Withdrawn JPH07207418A (en) | 1994-01-13 | 1994-01-13 | Bottom dross removing device in hot-dip galvanizing bath in hot-dip galvanizing line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07207418A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5961285A (en) * | 1996-06-19 | 1999-10-05 | Ak Steel Corporation | Method and apparatus for removing bottom dross from molten zinc during galvannealing or galvanizing |
| EP2145029A1 (en) * | 2007-04-12 | 2010-01-20 | Pyrotek Inc. | Galvanizing bath apparatus |
| CN114561608A (en) * | 2022-02-28 | 2022-05-31 | 乐亭前进钢结构有限公司 | Hot-dip galvanizing pool for hot-dip galvanizing process and hot-dip galvanizing process |
-
1994
- 1994-01-13 JP JP223594A patent/JPH07207418A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5961285A (en) * | 1996-06-19 | 1999-10-05 | Ak Steel Corporation | Method and apparatus for removing bottom dross from molten zinc during galvannealing or galvanizing |
| EP2145029A1 (en) * | 2007-04-12 | 2010-01-20 | Pyrotek Inc. | Galvanizing bath apparatus |
| EP2145029A4 (en) * | 2007-04-12 | 2011-02-16 | Pyrotek Inc | Galvanizing bath apparatus |
| AU2008240110B2 (en) * | 2007-04-12 | 2013-08-22 | Pyrotek, Inc. | Galvanizing bath apparatus |
| CN114561608A (en) * | 2022-02-28 | 2022-05-31 | 乐亭前进钢结构有限公司 | Hot-dip galvanizing pool for hot-dip galvanizing process and hot-dip galvanizing process |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20010403 |