JPH083707A - Hot dipping metal plating vessel having dross recovering device - Google Patents
Hot dipping metal plating vessel having dross recovering deviceInfo
- Publication number
- JPH083707A JPH083707A JP14052694A JP14052694A JPH083707A JP H083707 A JPH083707 A JP H083707A JP 14052694 A JP14052694 A JP 14052694A JP 14052694 A JP14052694 A JP 14052694A JP H083707 A JPH083707 A JP H083707A
- Authority
- JP
- Japan
- Prior art keywords
- dross
- galvanizing
- flow passage
- bath
- liquid
- 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- Withdrawn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
Landscapes
- Coating With Molten Metal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば連続溶融亜鉛め
っきラインの溶融亜鉛めっき浴中に浮遊しているドロス
を大径化させて除去することに適した溶融亜鉛めっき槽
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot dip galvanizing tank suitable for removing dross floating in a hot dip galvanizing bath of a continuous hot dip galvanizing line by increasing its diameter.
【０００２】[0002]
【従来の技術】連続溶融亜鉛めっきラインでは、通常の
溶融亜鉛めっき鋼板と、溶融亜鉛めっき後に熱拡散処理
を行いめっき層を鉄と亜鉛の合金層とした合金化溶融亜
鉛めっき鋼板とを製造する。一般に両者は同一ラインで
適宜製造条件を切り換えることによって、連続的に製造
される。上記操業では溶融亜鉛めっき槽で鋼板から溶融
亜鉛めっき浴中に鉄が溶出して鉄と亜鉛の金属間化合物
を主体とする不純物、いわゆるドロスが生成する。これ
らドロスは、溶融亜鉛より密度が僅かに大きいので、比
較的大きいものは溶融亜鉛めっき槽の底部に沈殿して堆
積する。2. Description of the Related Art In a continuous hot-dip galvanizing line, an ordinary hot-dip galvanized steel sheet and an alloyed hot-dip galvanized steel sheet in which a galvanized layer is an alloy layer of iron and zinc are subjected to heat diffusion treatment after hot-dip galvanizing. . Generally, both are continuously manufactured by appropriately changing manufacturing conditions on the same line. In the above operation, iron is eluted from the steel sheet in the hot dip galvanizing bath into the hot dip galvanizing bath, and impurities called so-called dross containing mainly intermetallic compounds of iron and zinc are generated. Since these dross have a density slightly higher than that of hot-dip zinc, relatively large ones precipitate and deposit at the bottom of the hot-dip galvanizing bath.
【０００３】しかし、小さいものは溶融亜鉛めっき浴中
を鋼板が通板することによって随伴された溶融亜鉛の流
れによって攪拌されて、沈降できずに、常に溶融亜鉛め
っき浴中に浮遊している状態にある。この溶融亜鉛めっ
き浴中に浮遊するドロスが鋼板に付着すると、表面外観
が悪化したり、プレス成形時に表面欠陥を生じる原因に
なるため、特に優れた表面性状を要求される自動車用外
板においてはドロスの付着を防止する必要がある。However, the small ones are agitated by the flow of hot-dip galvanizing accompanied by the steel sheet passing through the hot-dip galvanizing bath, cannot be settled, and are always floating in the hot-dip galvanizing bath. It is in. If dross floating in this hot dip galvanizing bath adheres to the steel sheet, it may cause deterioration of the surface appearance or surface defects during press forming. It is necessary to prevent the adhesion of dross.
【０００４】このようなドロスの問題を解決する手段と
して、以下のような技術が開示されている。特開平４−
２２１０４９号公報では、溶融亜鉛めっき槽とは別に設
けた補助槽に溶融亜鉛を導いて、ドロスを鎮静させた後
に、上澄液を溶融亜鉛めっき槽のめっき浴温度より高く
した後に、元の温度に低下して、溶融亜鉛めっき槽に戻
している。これにより、溶融亜鉛めっき槽とは別に設け
た補助槽内で大径のドロスは沈降し、溶融亜鉛を昇温し
た後に元の温度に冷却することでドロスをめっき液に溶
解して、ドロス自体を微細化することができるとしてい
る。The following techniques have been disclosed as means for solving such a dross problem. Japanese Patent Laid-Open No. 4-
In JP 221049, after introducing molten zinc to an auxiliary bath provided separately from the hot dip galvanizing bath to calm dross, the supernatant liquid is heated to a temperature higher than that of the hot dip galvanizing bath, and then the original temperature is set. It has fallen back to the hot dip galvanizing tank. As a result, the large-diameter dross settles in the auxiliary bath provided separately from the hot dip galvanizing bath, and the dross is dissolved in the plating solution by heating the hot dip zinc and then cooling it to the original temperature. Is said to be able to be miniaturized.
【０００５】[0005]
【発明が解決しようとする課題】上述した技術では、溶
融亜鉛めっき槽とは別に補助槽を設け、その中で温度操
作等を加えることで大径ドロスを除去、ドロスを微細化
することでドロスを無害化するものである。In the technique described above, an auxiliary bath is provided in addition to the hot dip galvanizing bath, and large-diameter dross is removed and fine dross is obtained by adding temperature operation in the auxiliary bath. To make it harmless.
【０００６】しかしながら、以下の問題点がある。第一
に、補助浴槽で５００℃ないし６５０℃にまで昇温し
て、ドロスを溶融亜鉛液中に溶解させた後に、昇温した
溶融亜鉛液を溶融亜鉛めっき槽の使用温度である４４０
℃ないし４８０℃に冷却するためには、膨大なエネルギ
ーが必要であり、熱回収を行ったとしても、エネルギー
使用の効率が著しく低い。However, there are the following problems. First, after raising the temperature to 500 ° C. to 650 ° C. in the auxiliary bath to dissolve the dross in the hot dip zinc solution, the hot dip zinc solution is heated to 440 which is the operating temperature of the hot dip galvanizing tank.
A huge amount of energy is required for cooling to 480 to 480 ° C., and even if heat is recovered, the efficiency of energy use is extremely low.
【０００７】第二に、溶融亜鉛めっき槽とは別に補助槽
を設けることは、その浴槽及び循環設備が必要であるた
めに、設備コストがかかる。また、その設備を稼動させ
るためには、循環に使用するポンプの動力、あるいはメ
ンテナンスが必要であり、いわゆるランニングコストが
かかる。そのため、装置を稼動させるためには相当の費
用を有する問題がある。Secondly, providing an auxiliary bath in addition to the hot dip galvanizing bath requires facility cost because the bath and circulation equipment are required. Further, in order to operate the equipment, power of the pump used for circulation or maintenance is required, and so-called running cost is required. Therefore, there is a problem that operating the device has a considerable cost.
【０００８】第三に、補助浴槽である静定層に堆積した
大径のドロスを除去するためには、溶融亜鉛めっき槽と
同様の作業を行う必要があり、装置的には溶融亜鉛めっ
き槽を大型化して機能分担したのと等価であり根本的解
決にはなっていない。また、既存の設備への設備化を検
討した場合には、スペース制約等の問題で対応すること
が必ずしもできない。Thirdly, in order to remove the large-diameter dross accumulated in the statically determinable layer which is the auxiliary bath, it is necessary to perform the same work as in the hot dip galvanizing bath, and the hot dip galvanizing bath in terms of equipment is required. It is equivalent to enlarging and sharing the functions and is not a fundamental solution. Also, when considering the installation of existing equipment, it is not always possible to deal with it due to problems such as space constraints.
【０００９】このような技術によってドロスを効率的に
除去する、または無害化する設備を簡便な方法で作るこ
とは非常に困難である。本発明は、上記のような問題点
の解決を図ったものであり、ドロスを効率的に除去する
ことに適した溶融亜鉛めっき槽を提供することを目的と
する。[0009] It is very difficult to make a facility for efficiently removing or detoxifying dross by such a technique by a simple method. The present invention is intended to solve the above problems, and an object of the present invention is to provide a hot dip galvanizing bath suitable for efficiently removing dross.
【００１０】[0010]
【課題を解決するための手段】本発明は、通板する鋼板
に溶融金属めっきを施すめっき槽において、前記めっき
槽に、溶融金属を循環させる流路と、当該流路内の溶融
金属を循環させる循環装置を設けるとともに、前記流路
入口に溶融金属を加熱する加熱装置と、その流路出口に
隣接してドロスを回収する回収装置を設けたことを特徴
としている。DISCLOSURE OF THE INVENTION The present invention is a plating tank for performing hot metal plating on a steel plate to be passed, and a flow path for circulating the hot metal in the plating tank and a hot metal in the flow path. In addition to providing a circulation device for heating, a heating device for heating the molten metal at the inlet of the flow passage and a recovery device for recovering dross adjacent to the outlet of the flow passage are provided.
【００１１】[0011]
【作用】本願発明のめっき槽においては、めっき浴の循
環装置によってめっき浴を流路に導くとともに、流路内
のめっき浴を加熱装置によって加熱する。流路を循環さ
せられためっき浴は、ドロスの回収装置を通過するとき
にドロスを回収されて清浄な状態で再びめっき槽内に還
流される。In the plating tank of the present invention, the plating bath circulating device guides the plating bath to the flow path, and the plating bath in the flow path is heated by the heating device. The plating bath that has been circulated in the flow path is collected in the dross when it passes through the dross recovery device, and is returned to the plating tank again in a clean state.
【００１２】本発明は上記のような構成なので、めっき
槽内に収納された溶融金属を流路の入口で例えば５００
℃〜７５０℃に昇温して流路に流入させ、流路を通過し
ている間に例えば１０℃／分以下で冷却して、流路出口
で溶融金属の保温に必要な温度になるようにする。溶融
金属の温度を昇温するのは、溶融金属に対する鉄の溶解
度を増加させてドロスを溶解するためである。Since the present invention has the above-mentioned structure, the molten metal contained in the plating tank is, for example, 500 at the inlet of the flow path.
C. to 750.degree. C., flow into the flow channel, cool it while passing through the flow channel at, for example, 10.degree. C./min or less, and adjust the temperature to the temperature required for keeping the temperature of the molten metal at the flow channel outlet. To The reason for raising the temperature of the molten metal is to increase the solubility of iron in the molten metal to dissolve the dross.
【００１３】このとき、もともと溶融めっき浴中に存在
するドロスのうち、細かいものは完全に溶解し、大きい
ものは一部が溶解して小径化する。昇温する温度の範囲
は５００℃〜７５０℃が好ましい。５００℃未満では昇
温する前の溶融金属の溶解度との違いが小さいために、
細かいドロスを十分溶解できないためである。また、７
５０℃を超える温度では昇温しても溶解度に大きな差が
ないので、効果が変わらないためである。At this time, of the dross originally present in the hot dip bath, the fine ones are completely dissolved and the larger ones are partially dissolved to reduce the diameter. The temperature range to be raised is preferably 500 ° C to 750 ° C. If the temperature is less than 500 ° C, the difference with the solubility of the molten metal before the temperature is raised is small,
This is because fine dross cannot be sufficiently dissolved. Also, 7
This is because the effect does not change because there is no large difference in solubility even if the temperature is raised above 50 ° C.
【００１４】次に、昇温後の溶融金属温度をゆっくり冷
却するのは、過飽和状態の鉄が晶出する際に、既存のド
ロスを核にして析出することによって、既存のドロスの
大径化を促進するためである。冷却速度は１０℃／分以
下にすることが好ましい。冷却速度を１０℃／分以下に
すると、過飽和状態の鉄が晶出する際に、新たなドロス
核を生成する反応よりも、既存のドロスを核にして析出
することが優先して、既存のドロスの大径化を促進する
ことが出来る。Next, slowly cooling the temperature of the molten metal after raising the temperature is to increase the diameter of the existing dross by precipitating the existing dross as nuclei when supersaturated iron is crystallized. Is to promote. The cooling rate is preferably 10 ° C./minute or less. When the cooling rate is 10 ° C./minute or less, when the supersaturated iron is crystallized, the existing dross is used as a nucleus for precipitation rather than the reaction for generating a new dross nucleus. The dross can be increased in diameter.
【００１５】[0015]
【実施例】以下に本発明の実施例を図によって説明す
る。図１は本発明の一実施例を示す斜視図である。図１
において、１はめっき槽であり、この槽内は溶融亜鉛５
で満たされている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of the present invention. FIG.
In the figure, 1 is a plating tank, and the inside of this tank is molten zinc 5
Is filled with.
【００１６】２は高周波誘導加熱装置、３はリニア型電
磁コイルを示している。リニア型電磁コイル３は、磁極
３ａに水平方向に走る溝３ｂを、磁極３ａの長さ方向に
一定間隔で多数設け、この溝３ｂに電線（図示略）を通
し、山部が垂直方向に交互に１山以上の任意のピッチで
Ｎ極とＳ極に磁化されるように配線する。そして、複数
山のピッチで正弦状にＮＳが変化する進行磁場を利用す
る。Reference numeral 2 is a high frequency induction heating device, and 3 is a linear type electromagnetic coil. The linear electromagnetic coil 3 has a large number of grooves 3b running horizontally in the magnetic pole 3a provided at regular intervals in the length direction of the magnetic pole 3a, and electric wires (not shown) are passed through the grooves 3b so that the peaks alternate in the vertical direction. In addition, wiring is performed so that the N pole and the S pole are magnetized at an arbitrary pitch of one or more peaks. Then, a traveling magnetic field in which NS changes sinusoidally at a pitch of a plurality of peaks is used.
【００１７】４はめっき槽１内に設けた流路であり、槽
の側壁に近接させた仕切り壁９を設けて形成している。
溶融亜鉛はＡ、Ｂ，Ｃ、Ｄ点を通り矢印の方向に流れて
めっき槽内を循環する。６は冷却された溶融亜鉛に含ま
れる大径化して沈降したドロスを槽外に汲み出すための
ドロス回収バケットである。Reference numeral 4 denotes a flow path provided in the plating tank 1, which is formed by providing a partition wall 9 close to the side wall of the tank.
The molten zinc flows through the points A, B, C and D in the direction of the arrow and circulates in the plating tank. Reference numeral 6 is a dross recovery bucket for pumping out the dross contained in the cooled molten zinc and having a large diameter and settling out of the tank.
【００１８】本発明による溶融亜鉛５のめっき槽１内に
おける温度の履歴の一実施例を図２に示す。溶融亜鉛５
はめっき槽１内のＡ点よりＢ点を経て高週波誘導加熱装
置２及びリニア型電磁コイル３内に流れ、Ｃ点までに、
５４０℃に昇温された溶融亜鉛は流路４を経てＤ点まで
流れる。流路４を流れる間に５４０℃の溶融亜鉛の熱
は、仕切り壁９を介して内側の溶融亜鉛５に熱が伝わ
り、溶融亜鉛の保温効果とドロスを大径化するための溶
融亜鉛の冷却効果が同時に行われる。FIG. 2 shows an embodiment of the temperature history of the molten zinc 5 in the plating tank 1 according to the present invention. Molten zinc 5
Flows from the point A in the plating tank 1 through the point B into the high frequency induction heating device 2 and the linear electromagnetic coil 3, and by the point C,
The molten zinc heated to 540 ° C. flows through the flow path 4 to point D. While flowing through the flow path 4, the heat of the molten zinc at 540 ° C. is transmitted to the inner molten zinc 5 via the partition wall 9, and the heat retention effect of the molten zinc and the cooling of the molten zinc for increasing the diameter of the dross are achieved. The effects take place simultaneously.
【００１９】Ｄ点から溶融亜鉛めっき槽内の元の位置に
循環した溶融亜鉛は含有するドロスは大径化しているの
で、流路出口に隣接して設けたドロス回収バケット６で
沈降する。ドロス回収バケット６は周面に細孔を有する
もので、ドロスを捕獲し、溶融亜鉛は通過させる。ドロ
ス回収バケット６に堆積したドロスは回収バケットごと
槽外に取り出すことで、ドロスの除去が出来る。回収バ
ケットを通過した清浄な溶融亜鉛は浸漬ロール７で反転
して引抜かれる鋼板８のめっきに寄与される。Since the dross containing the molten zinc circulated from the point D to the original position in the hot dip galvanizing tank has a large diameter, it is settled in the dross recovery bucket 6 provided adjacent to the flow path outlet. The dross recovery bucket 6 has pores on its peripheral surface and captures dross and allows molten zinc to pass through. The dross accumulated in the dross recovery bucket 6 can be removed by taking it out of the tank together with the recovery bucket. The clean molten zinc that has passed through the recovery bucket contributes to the plating of the steel plate 8 that is inverted and pulled out by the dipping roll 7.
【００２０】次に図１に示すめっき槽を用いて、本発明
の効果を確認するために行った実験について説明する。
めっき槽１内には、４６０℃に加熱された２５ｍ3 の溶
融亜鉛５が入っている。一対の高周波誘導加熱装置２と
リニア型電磁コイル３には４ｍ3 ／ｈの流量でめっき浴
が循環している。８０℃昇温して５４０℃になった昇温
溶融亜鉛が循環流路４を流れて４６０℃に低下してめっ
き槽１の元の位置に循環する。Next, an experiment conducted to confirm the effect of the present invention by using the plating tank shown in FIG. 1 will be described.
The plating bath 1 contains 25 m 3 of molten zinc 5 heated to 460 ° C. The plating bath circulates through the pair of high-frequency induction heating devices 2 and the linear electromagnetic coil 3 at a flow rate of 4 m 3 / h. The temperature-elevated molten zinc having a temperature of 80 ° C. and a temperature of 540 ° C. flows through the circulation channel 4 to a temperature of 460 ° C. and circulates to the original position in the plating tank 1.
【００２１】循環流路の幅は溶融亜鉛が凝固しないで流
動出来るように１０ｃｍ、深さは１ｍである。つまり、
溶融亜鉛流速は２０ｍ／ｈ、めっき槽の長さが５ｍであ
るので１５分で出口に到達する。The width of the circulation channel is 10 cm and the depth is 1 m so that molten zinc can flow without solidification. That is,
The flow rate of molten zinc is 20 m / h, and the length of the plating tank is 5 m, so that it reaches the outlet in 15 minutes.
【００２２】即ち、冷却速度は８０℃／１５＝５．３℃
／分である。単位時間当たりの入熱量は ４ｍ3 ／ｈ ×６６００ｋｇ／ｍ3 ×０．１２ｋｃａｌ
／ｋｇ℃×８０℃＝２５３ＭＪ また、放熱量はめっき槽の大きさが長さ５ｍ、幅２．５
ｍ、深さ２ｍであることから、表面での放熱量は ４．８８×（７．３３4 −３4 ) ×5 ×2.5 ＝１７１ＭＪ めっき槽の耐火物からの抜熱量は ２０００×（５×２．５＋２×１５）＝８５ＭＪ となり、ほぼ熱バランスは取れることになる。That is, the cooling rate is 80 ° C./15=5.3° C.
/ Min. Heat input per unit time is 4 m 3 / h × 6600 kg / m 3 × 0.12 kcal
/ Kg ℃ × 80 ℃ ＝ 253MJ In addition, the amount of heat radiation is 5m in length of the plating tank and 2.5 in width.
m, since the depth 2m, the amount of heat radiation at the surface 4.88 × (7.33 4 -3 4) × 5 × 2.5 = heat extraction rate from refractory 171MJ plating tank 2000 × (5 × 2.5 + 2 × 15) = 85 MJ, which means that the heat balance can be almost achieved.
【００２３】これにより、ドロス回収バケットには、５
００〜１０００μに大径化したドロスが堆積し、その量
は２ｍ3 ／月にも達した。また、めっき槽１の浴中ドロ
スの平均径は１００μから３０μにまで低下して、従来
発生していたドロス欠陥は皆無になった。As a result, the dross recovery bucket has 5
The dross increased in diameter from 00 to 1000 μ was deposited, and the amount reached 2 m 3 / month. Further, the average diameter of the dross in the bath of the plating tank 1 was reduced from 100 μ to 30 μ, and the dross defects that were conventionally generated were eliminated.
【００２４】[0024]
【発明の効果】本発明によれば、溶融亜鉛中に存在する
ドロスを大径化することによって、沈降させてドロスの
系外排出を容易にすることにより、工業的有用な効果を
もたらす。EFFECTS OF THE INVENTION According to the present invention, the dross existing in molten zinc is made to have a large diameter so that the dross is allowed to settle and discharge of dross out of the system is facilitated.
【図１】本発明による装置の一実施例を示す図である。FIG. 1 shows an embodiment of the device according to the invention.
【図２】本発明の溶融亜鉛の温度履歴を示す図である。FIG. 2 is a diagram showing a temperature history of molten zinc of the present invention.
１ 溶融亜鉛めっき槽 ２ 高周波誘導加熱装置 ３ リニア型電磁コイル ４ 流路 ５ 溶融亜鉛 ６ ドロス回収パケット ７ 浸漬ロール ８ 鋼板 ９ 仕切り壁 1 Hot dip galvanizing tank 2 High frequency induction heating device 3 Linear type electromagnetic coil 4 Flow path 5 Hot dip zinc 6 Dross recovery packet 7 Immersion roll 8 Steel plate 9 Partition wall
Claims (1)
っき槽において、前記めっき槽に、溶融金属を循環させ
る流路と、当該流路内の溶融金属を循環させる循環装置
を設けるとともに、前記流路入口に溶融金属を加熱する
加熱装置と、その流路出口に隣接してドロスを回収する
回収装置を設けたことを特徴とするドロス回収装置を有
する溶融金属めっき槽。1. A plating tank for performing molten metal plating on a steel plate to be passed, wherein the plating tank is provided with a channel for circulating the molten metal and a circulation device for circulating the molten metal in the channel, and What is claimed is: 1. A molten metal plating tank having a dross recovery device, comprising: a heating device for heating molten metal at a flow path inlet; and a recovery device for recovering dross adjacent to the flow path outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14052694A JPH083707A (en) | 1994-06-22 | 1994-06-22 | Hot dipping metal plating vessel having dross recovering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14052694A JPH083707A (en) | 1994-06-22 | 1994-06-22 | Hot dipping metal plating vessel having dross recovering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH083707A true JPH083707A (en) | 1996-01-09 |
Family
ID=15270722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14052694A Withdrawn JPH083707A (en) | 1994-06-22 | 1994-06-22 | Hot dipping metal plating vessel having dross recovering device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH083707A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6426122B1 (en) | 1998-04-01 | 2002-07-30 | Nkk Corporation | Method for hot-dip galvanizing |
| JP2008095207A (en) * | 1998-04-01 | 2008-04-24 | Jfe Steel Kk | Method for hot-dip galvanizing and apparatus for the same |
| KR101137621B1 (en) * | 2009-11-30 | 2012-04-20 | 현대하이스코 주식회사 | Plating bath for fabricating galvanized steel contained apparatus for removal of dross |
-
1994
- 1994-06-22 JP JP14052694A patent/JPH083707A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6426122B1 (en) | 1998-04-01 | 2002-07-30 | Nkk Corporation | Method for hot-dip galvanizing |
| US6770140B2 (en) | 1998-04-01 | 2004-08-03 | Nkk Corporation | Apparatus for hot dip galvanizing |
| JP2008095207A (en) * | 1998-04-01 | 2008-04-24 | Jfe Steel Kk | Method for hot-dip galvanizing and apparatus for the same |
| KR101137621B1 (en) * | 2009-11-30 | 2012-04-20 | 현대하이스코 주식회사 | Plating bath for fabricating galvanized steel contained apparatus for removal of dross |
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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: 20010904 |