JP4295193B2 - Zinc recovery device from floating dross of hot dip galvanizing bath - Google Patents

Zinc recovery device from floating dross of hot dip galvanizing bath Download PDF

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JP4295193B2
JP4295193B2 JP2004302412A JP2004302412A JP4295193B2 JP 4295193 B2 JP4295193 B2 JP 4295193B2 JP 2004302412 A JP2004302412 A JP 2004302412A JP 2004302412 A JP2004302412 A JP 2004302412A JP 4295193 B2 JP4295193 B2 JP 4295193B2
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dross
hot dip
dip galvanizing
galvanizing bath
zinc
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JP2006111944A (en
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徳博 水野
三喜夫 川村
忠 稲谷
敏一 眞下
正美 毛利
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Nippon Steel Corp
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    • 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
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Description

本発明は、亜鉛めっき鋼板の製造に用いられる溶融亜鉛めっき浴の液面に浮遊するドロスから亜鉛を回収する装置に関するものである。   The present invention relates to an apparatus for recovering zinc from dross floating on the liquid surface of a hot dip galvanizing bath used for manufacturing a galvanized steel sheet.

亜鉛めっき鋼板の製造に用いられる溶融亜鉛めっき浴の表面には、浮遊ドロスが発生する。これはめっき付着量を制御するワイピング部において溶融亜鉛が空気と接触して生成されるものであり、そのまま放置すると液面に凝固・堆積し鋼板に付着して押し疵を誘発するため、定期的に排除する必要がある。このため従来は作業員がスプーン状の器具により浮遊ドロスを除去していたが、高温騒音条件下での重筋作業であるため、疲労が著しいという問題があった。   Floating dross is generated on the surface of the hot dip galvanizing bath used in the manufacture of the galvanized steel sheet. This is because the molten zinc is generated in contact with the air in the wiping part that controls the amount of plating applied. Need to be eliminated. For this reason, in the past, workers removed floating dross with a spoon-like instrument, but there was a problem that fatigue was significant because of the heavy muscle work under high-temperature noise conditions.

このため特許文献１に示されるように、容器をロボットアームの先端に取り付けてドロスをすくい上げ、除去する装置が開発されている。しかしこのときにドロスとともに亜鉛をもすくい出してしまうため、容器の底面を開口径が２〜２０ｍｍ程度の網目としておき、溶融亜鉛を滴下させている。しかしそれでもすくい出した浮遊ドロスには９０％以上の亜鉛が含まれており、溶融亜鉛めっき浴の亜鉛歩留まりを低下させている。   For this reason, as disclosed in Patent Document 1, a device has been developed that attaches a container to the tip of a robot arm to scoop up and remove the dross. However, since zinc is scooped out together with dross at this time, the bottom surface of the container is formed as a mesh having an opening diameter of about 2 to 20 mm, and molten zinc is dropped. However, the floating dross scooped out still contains 90% or more of zinc, which reduces the zinc yield of the hot dip galvanizing bath.

そこで特許文献１及び特許文献２に示されるように、容器の周囲をヒーターで加熱して亜鉛を溶解し、溶融亜鉛めっき浴中に滴下させる工夫がなされている。しかしいずれも溶融亜鉛を容器中から自重で落下させる方式であるために亜鉛の回収率は１０％未満と低く、亜鉛歩留まりを十分に向上させることができなかった。
特開平４−３２５４４号公報 特開平１０−３３０８５９号公報 Therefore, as disclosed in Patent Document 1 and Patent Document 2, a device has been devised in which the periphery of the container is heated with a heater to dissolve zinc and is dropped into a hot dip galvanizing bath. However, in any case, since the molten zinc is dropped by its own weight from the container, the recovery rate of zinc is as low as less than 10%, and the zinc yield cannot be sufficiently improved.
JP-A-4-32544 JP 10-330859 A

本発明は上記した従来の問題点を解決し、溶融亜鉛めっき浴の表面の浮遊ドロスを除去することができるとともに、浮遊ドロスに含まれる溶融亜鉛を効率よく回収することができ、亜鉛歩留まりの低下を防止することができる溶融亜鉛めっき浴浮遊ドロスからの亜鉛回収装置を提供することを目的とするものである。   The present invention solves the above-described conventional problems, can remove floating dross on the surface of the hot dip galvanizing bath, and can efficiently recover the molten zinc contained in the floating dross, thereby reducing the zinc yield. An object of the present invention is to provide an apparatus for recovering zinc from a floating dross of a hot dip galvanizing bath that can prevent the above.

上記の課題を解決するためになされた本発明の溶融亜鉛めっき浴浮遊ドロスからの亜鉛回収装置は、溶融亜鉛めっき浴の近傍に設置されたドロス汲みロボットのアーム先端に、底面及び側面に多数の開口を備え、側面と底面との間の角度を４０°〜８０°としたドロス収容容器を取り付けるとともに、溶融亜鉛めっき浴の上方には、ドロス収容容器の内面形状に対応する形状であり、ヒーターを内蔵させた金型によりこのドロス収容容器の内部のドロスを押圧して溶融亜鉛をしぼり出す押圧手段を設置したことを特徴とするものである。 An apparatus for recovering zinc from a hot dip galvanizing bath floating dross of the present invention, which has been made to solve the above-described problems, has a large number of bottom and side surfaces at the tip of the arm of a dross pumping robot installed near the hot dip galvanizing bath. A dross storage container provided with an opening and having an angle between the side surface and the bottom surface of 40 ° to 80 ° is attached. Above the hot dip galvanizing bath, a shape corresponding to the inner surface shape of the dross storage container is provided. A pressing means for pressing out the dross inside the dross storage container and squeezing out molten zinc by a metal mold containing the inside of the dross is provided.

なお、押圧手段の金型によるしぼり出し効果を高めるために、ドロス収容容器をすり鉢状とすることが好ましい。 In addition, in order to enhance the squeezing effect by the die of the pressing means, it is preferable that the dross storage container has a mortar shape .

本発明の装置によれば、アーム先端にドロス収容容器を取り付けたドロス汲みロボットによって単にドロスを汲みだすだけではなく、ドロス収容容器を押圧手段の直下に停止させて金型を降下させるか、ドロス収容容器を上昇させることにより、ドロス収容容器内部のドロスを加圧してドロス中から溶融亜鉛をしぼり出すことができる。このため溶融亜鉛めっき浴の表面の浮遊ドロスを除去できることはもちろん、亜鉛回収率を２０〜３０％程度にまで大幅に向上させることが可能となる。   According to the apparatus of the present invention, not only the dross is pumped out by the dross pumping robot having the dross container attached to the end of the arm, but the die is lowered by stopping the dross container just below the pressing means, or By raising the container, it is possible to pressurize the dross inside the dross container and squeeze out molten zinc from the dross. For this reason, it is possible not only to remove the floating dross on the surface of the hot dip galvanizing bath, but also to greatly improve the zinc recovery rate to about 20 to 30%.

以下に本発明の好ましい実施形態を示す。
図１は本発明の好ましい実施形態を示す概念図であり、１は亜鉛めっき鋼板の製造に用いられる溶融亜鉛めっき浴、２はその近傍に設置されたドロス汲みロボットである。ドロス汲みロボット２のアーム３の先端にはドロス収容容器４が取り付けられており、液面の浮遊ドロスをすくい取る。 Preferred embodiments of the present invention are shown below.
FIG. 1 is a conceptual diagram showing a preferred embodiment of the present invention, wherein 1 is a hot dip galvanizing bath used for producing a galvanized steel sheet, and 2 is a dross pumping robot installed in the vicinity thereof. A dross container 4 is attached to the tip of the arm 3 of the dross drawing robot 2 and scoops out floating dross on the liquid surface.

ドロス収容容器４は図２に示すように、上部が開いたすり鉢状の金属容器であり、その底面及び側面には多数の開口５が形成されている。この実施形態では底面は円形であるが、多角形としてもよい。ドロス収容容器４の側面と底面との間の角度θは、４０°〜８０°とすることが好ましい。この角度が８０°を越えると容積が小さくなるため汲み出し回数が増加し、且つ残渣ドロスが付着しやすくなる。又、この角度を４０°よりも小さくすると押圧の力がドロスに充分伝わらず回収率が低くなるからである。最も好ましい範囲は５０°〜６０°である。   As shown in FIG. 2, the dross storage container 4 is a mortar-shaped metal container having an open top, and a large number of openings 5 are formed on the bottom and side surfaces thereof. In this embodiment, the bottom surface is circular, but may be polygonal. The angle θ between the side surface and the bottom surface of the dross container 4 is preferably 40 ° to 80 °. When this angle exceeds 80 °, the volume is reduced, so that the number of pumping is increased and the residue dross is likely to adhere. Also, if this angle is smaller than 40 °, the pressing force is not sufficiently transmitted to the dross, and the recovery rate is lowered. The most preferred range is from 50 ° to 60 °.

開口５の孔径は６〜１４mmとすることが好ましい。これよりも小さいと目詰まりし易く、これよりも大きいとドロスが流下してしまうおそれがあるためである。図４に開口率とピッチと孔径との関係を図示した。図示のように開口率が大きくなると強度不足を招くため、開口率が１０〜３０％、ピッチが１５〜２０mm前後の範囲が最も好ましい。   The diameter of the opening 5 is preferably 6 to 14 mm. If it is smaller than this, clogging is likely to occur, and if it is larger than this, dross may flow down. FIG. 4 shows the relationship among the aperture ratio, pitch, and hole diameter. As shown in the figure, when the aperture ratio is increased, the strength is insufficient. Therefore, the aperture ratio is most preferably in a range of 10 to 30% and a pitch of about 15 to 20 mm.

なおドロス収容容器４の表面にはセラミックコーティングを施して濡れ性を抑制し、ドロスの付着防止を図ることが好ましい。ドロス汲みロボット２はプログラムに従ってアーム３を動かして溶融亜鉛めっき浴１の表面の浮遊ドロスを一箇所にかき集め、すくい取る。   It is preferable to apply a ceramic coating to the surface of the dross container 4 to suppress wettability and prevent dross from adhering. The dross drawing robot 2 moves the arm 3 in accordance with the program, collects floating dross on the surface of the hot dip galvanizing bath 1 in one place, and scoops it up.

溶融亜鉛めっき浴１の上方には、押圧手段６が設置されている。この押圧手段６はシリンダ７により昇降されるアーム８の下端に金型９を支持させたものである。この金型９は図２に示すようにドロス収容容器４の内面形状に対応する形状のものであり、側面と底面との間の角度θはやはり４０°〜８０°となっている。その材質は例えばSSであるが亜鉛よりも融点の高い金属であればその他の材質とすることもできる。   A pressing means 6 is installed above the hot dip galvanizing bath 1. The pressing means 6 has a mold 9 supported on the lower end of an arm 8 that is moved up and down by a cylinder 7. The mold 9 has a shape corresponding to the shape of the inner surface of the dross container 4 as shown in FIG. 2, and the angle θ between the side surface and the bottom surface is also 40 ° to 80 °. The material is, for example, SS, but other materials can be used as long as the melting point is higher than that of zinc.

ドロス汲みロボット２は浮遊ドロスをすくい取ったのち、押圧手段６の直下の液面上にドロス収容容器４を静止させる。押圧手段６が金型９をドロス収容容器４の内部に向かって降下させるか、ドロス汲みロボット２がドロス収容容器４を金型９に向かって上昇させることにより、ドロス中から溶融亜鉛をしぼり出すようになっている。このとき金型９の表面にドロスが付着することを防止するために、金型９の表面にもセラミックコーティングを施しておくことが好ましい。また図３に示すように金型９にヒーター１０を内蔵させておき、亜鉛の融点(４２０℃）以上に金型９を加熱するものとする。この実施形態では約５００℃に加熱し、ドロスが付着することを防止している。 After scooping the floating dross, the dross drawing robot 2 stops the dross container 4 on the liquid level immediately below the pressing means 6. The pressing means 6 lowers the mold 9 toward the inside of the dross container 4 or the dross pumping robot 2 raises the dross container 4 toward the mold 9 to squeeze out molten zinc from the dross. It is like that. At this time, in order to prevent dross from adhering to the surface of the mold 9, it is preferable to apply a ceramic coating to the surface of the mold 9. Also allowed to built a heater 10 to the mold 9, as shown in FIG. 3, it is assumed that heating the mold 9 above zinc melting point (420 ° C.). In this embodiment, it is heated to about 500 ° C. to prevent dross from adhering.

なお、金型９の押し込みストロークを大きくすると亜鉛回収率が増加し、また汲み出し量を大きくしても亜鉛回収率が増加する。図５は（汲み出し量）×（ストローク）２を指数KIとしてこれらの関係を一元的にまとめたグラフである。ただし亜鉛回収率を増加させると溶融亜鉛めっき浴１中のアルミニウム含有率が減少し、めっき特性に影響を及ぼしたり、ボトムドロスと呼ばれる槽底部のドロスが増加したりする傾向を生じる。このため実生産上は亜鉛回収率はあまり増加させず、２０〜３０％程度に留めることが好ましいと考えられる。 In addition, if the pushing stroke of the die 9 is increased, the zinc recovery rate is increased, and even if the pumping amount is increased, the zinc recovery rate is increased. FIG. 5 is a graph summarizing these relationships, with (pumping amount) × (stroke) 2 as an index KI. However, when the zinc recovery rate is increased, the aluminum content in the hot dip galvanizing bath 1 is decreased, which tends to affect the plating characteristics or increase the dross at the bottom of the tank called bottom dross. For this reason, it is considered that it is preferable that the zinc recovery rate is not increased so much in actual production and is kept at about 20 to 30%.

上記した本発明の装置の動作をまとめると次のとおりである。
まずドロス汲みロボット２がドロス収容容器４を浴中に３０秒程度浸漬し、付着しているドロスを溶解する。次にドロス汲みロボット２が予めプログラムされた通りアーム３を動かし、浮遊ドロスを一ヶ所にかき集めたうえ、ドロス収容容器４によりすくい取る。このときの動作パターンの一例を図６に示す。このようにして浮遊ドロスをすくい取った後、ドロス汲みロボット２はドロス収容容器４を上下左右に揺り動かして溶融亜鉛を開口５から流下させる。次にドロス汲みロボット２は押圧手段６の直下の液面上にドロス収容容器４を静止させ、押圧手段６が金型９をドロス収容容器４の内部に向かって降下させるか、ドロス収容容器４を上昇させることにより、ドロス収容容器４内のドロス中から溶融亜鉛をしぼり出す。このとき搾り出された亜鉛は浴中に戻る。その後、図１に示すようにドロス汲みロボット２がドロス収容容器４を反転させ、残渣ドロスをドロスバケット１１に排出する。 The operation of the apparatus of the present invention described above is summarized as follows.
First, the dross drawing robot 2 immerses the dross container 4 in the bath for about 30 seconds to dissolve the adhering dross. Next, the dross drawing robot 2 moves the arm 3 as programmed in advance, collects the floating dross in one place, and scoops it up with the dross container 4. An example of the operation pattern at this time is shown in FIG. After scooping out the floating dross in this way, the dross drawing robot 2 swings the dross container 4 up and down and left and right to let the molten zinc flow down from the opening 5. Next, the dross pumping robot 2 stops the dross storage container 4 on the liquid level immediately below the pressing means 6, and the pressing means 6 lowers the mold 9 toward the inside of the dross storage container 4 or the dross storage container 4. , The molten zinc is squeezed out from the dross in the dross container 4. At this time, the squeezed zinc returns to the bath. Thereafter, as shown in FIG. 1, the dross drawing robot 2 reverses the dross container 4 and discharges the residual dross to the dross bucket 11.

上記した本発明によれば、浮遊ドロスの汲み出し量が半減し、亜鉛地金コストを大幅に低減させることが可能となる。   According to the present invention described above, the amount of floating dross drawn out is halved, and the cost of zinc bullion can be greatly reduced.

本発明の好ましい実施形態を示す概念図である。It is a conceptual diagram which shows preferable embodiment of this invention. ドロス収容容器の（Ａ）正面図と（Ｂ）底面図である。It is the (A) front view and (B) bottom view of a dross storage container. 金型の正面図である。It is a front view of a metal mold | die. 開口率とピッチと孔径との関係を示すグラフである。It is a graph which shows the relationship between an aperture ratio, a pitch, and a hole diameter. 汲み出し量とストロークと亜鉛回収率の関係を示すグラフである。It is a graph which shows the relationship between a pumping amount, a stroke, and a zinc recovery rate. 浮遊ドロスのすくい取りパターンを説明する平面図である。It is a top view explaining the skimming pattern of floating dross.

符号の説明Explanation of symbols

１ 溶融亜鉛めっき浴
２ ドロス汲みロボット
３ アーム
４ ドロス収容容器
５ 開口
６ 押圧手段
７ シリンダ
８ アーム
９ 金型
１０ ヒーター
１１ ドロスバケット DESCRIPTION OF SYMBOLS 1 Hot dip galvanizing bath 2 Dross drawing robot 3 Arm 4 Dross container 5 Opening 6 Pressing means 7 Cylinder 8 Arm 9 Mold 10 Heater 11 Dross bucket

Claims (2)

溶融亜鉛めっき浴の近傍に設置されたドロス汲みロボットのアーム先端に、底面及び側面に多数の開口を備え、側面と底面との間の角度を４０°〜８０°としたドロス収容容器を取り付けるとともに、溶融亜鉛めっき浴の上方には、ドロス収容容器の内面形状に対応する形状であり、ヒーターを内蔵させた金型によりこのドロス収容容器の内部のドロスを押圧して溶融亜鉛をしぼり出す押圧手段を設置したことを特徴とする溶融亜鉛めっき浴浮遊ドロスからの亜鉛回収装置。 At the tip of the arm of the dross pumping robot installed in the vicinity of the hot dip galvanizing bath, a dross storage container having a large number of openings on the bottom and side surfaces and an angle between the side surface and the bottom surface of 40 ° to 80 ° is attached. The upper part of the hot dip galvanizing bath has a shape corresponding to the shape of the inner surface of the dross storage container, and pressing means for pressing out the molten zinc by pressing the internal dross of the dross storage container with a mold incorporating a heater. An apparatus for recovering zinc from hot dip galvanizing bath floating dross, characterized in that it is installed. ドロス収容容器をすり鉢状としたことを特徴とする請求項１記載の溶融亜鉛めっき浴浮遊ドロスからの亜鉛回収装置。   2. The apparatus for recovering zinc from hot dip galvanizing bath floating dross according to claim 1, wherein the dross storage container has a mortar shape.
JP2004302412A 2004-10-18 2004-10-18 Zinc recovery device from floating dross of hot dip galvanizing bath Active JP4295193B2 (en)

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JPH10330859A (en) * 1997-05-28 1998-12-15 Kawasaki Steel Corp Zinc recovering device
AU6416599A (en) * 1998-10-05 2000-04-26 International Zinc Company Device and method for removing dross from a vessel of molten zinc with enhanced zinc yield
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