JP5711595B2 - Tin filling method - Google Patents

Tin filling method Download PDF

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JP5711595B2
JP5711595B2 JP2011091755A JP2011091755A JP5711595B2 JP 5711595 B2 JP5711595 B2 JP 5711595B2 JP 2011091755 A JP2011091755 A JP 2011091755A JP 2011091755 A JP2011091755 A JP 2011091755A JP 5711595 B2 JP5711595 B2 JP 5711595B2
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JP2012224891A (en
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山本　亮
亮 山本
圭司 神尾
圭司 神尾
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Nippon Steel Engineering Co Ltd
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本発明は、連続電気錫メッキラインにおける溶解槽に金属錫を充填する錫充填方法に関する。具体的には、例えば金属板に連続的に錫メッキを行う電気メッキラインにおいて、金属錫を溶解させ錫イオンを供給する際のスラッジ発生を減少させる錫充填方法に関する。 The present invention relates to a tin filling method for filling a melting tank in a continuous electric tin plating line with metallic tin. Specifically, for example, the present invention relates to a tin filling method for reducing sludge generation when metal tin is dissolved and tin ions are supplied in an electroplating line in which tin plating is continuously performed on a metal plate.

金属板に連続的に錫メッキを行う電気メッキラインにおいて、金属錫を溶解させ錫イオンを供給する際に発生するスラッジはメッキに寄与しないため原料原単位が悪化することとなる。これを解決するために、消費錫イオンに応じた錫イオンを供給するため、金属錫溶解槽に設けた圧力検出端にて槽内の圧力を検出することにより求めた圧力損失から残存金属錫粒子量を算出し、その値を使用して溶解槽へ送給するめっき液量と吹込み酸素量を制御する方法が開示されている。（特開平１０−２１９４９９号公報：下記特許文献１）。 In an electroplating line in which tin plating is continuously performed on a metal plate, sludge generated when metal tin is dissolved and tin ions are supplied does not contribute to plating, so that the raw material basic unit deteriorates. In order to solve this, in order to supply tin ions corresponding to consumed tin ions, residual metal tin particles are obtained from the pressure loss obtained by detecting the pressure in the tank at the pressure detection end provided in the metal tin dissolution tank. A method of calculating the amount and controlling the amount of plating solution and the amount of blown oxygen supplied to the dissolution tank using the value is disclosed. (Unexamined-Japanese-Patent No. 10-219499: the following patent document 1).

しかし特許文献１は、金属錫粒子と電気錫めっき液との固液流動層中に酸素を吹き込んで吹込み酸素量を制御している。また、特許文献1では、めっき液は、金属錫溶解槽内の残存金属錫粒子量に応じて金属錫溶解槽内に供給されるため金属錫粒子とめっき液の固液流動層中に吹き込む酸素吹込み量を調整しても吹き込む酸素量がめっき液の溶解に最適な量かどうかわからない。また、酸素の吹込み量については、錫のラインスピードや金属板へのめっき量等の条件により溶解速度が設定され、この溶解速度に基づいて設定されるため、酸素量を制御することは困難である。また、酸素量に応じめっき流量を増加させて、溶存酸素量を減少するとポンプ能力を増大させる必要があり、流量を一定以上大きくすると溶解槽内の金属錫の流動が激しくなり、溶解槽外に金属錫が流出するという問題点があった。 However, Patent Document 1 controls the amount of oxygen blown by blowing oxygen into a solid-liquid fluidized bed of metallic tin particles and electrotin plating solution. Further, in Patent Document 1, since the plating solution is supplied into the metal tin dissolution vessel according to the amount of residual metal tin particles in the metal tin dissolution vessel, oxygen blown into the solid-liquid fluidized bed of the metal tin particles and the plating solution. Even if the blowing amount is adjusted, it is not known whether the amount of oxygen blown is the optimum amount for dissolving the plating solution. In addition, as for the amount of oxygen blown, the dissolution rate is set according to conditions such as the tin line speed and the amount of plating on the metal plate, and since it is set based on this dissolution rate, it is difficult to control the oxygen amount. It is. In addition, if the plating flow rate is increased according to the oxygen amount and the dissolved oxygen amount is decreased, the pump capacity needs to be increased, and if the flow rate is increased above a certain level, the flow of metallic tin in the dissolution tank becomes intense, and it is outside the dissolution tank. There was a problem that metal tin flowed out.

特開平１０−２１９４９９号公報Japanese Patent Laid-Open No. 10-219499

本発明は、前述のような従来技術の問題点を解決し、操業上要求される酸素吹込み量つまり溶存酸素濃度に対して充分な金属錫を常時溶解槽内に確保できるうえ、操業中の金属錫量減少に対して、溶解槽サイズを増大させることなく溶解槽内の金属錫量を充分量以上に保つことができる錫充填方法を提供することを課題とする。 The present invention solves the problems of the prior art as described above, can always ensure sufficient metal tin in the dissolution tank for the oxygen blowing amount required for operation, that is, dissolved oxygen concentration, and is in operation. It is an object of the present invention to provide a tin filling method capable of maintaining the amount of metal tin in a dissolution tank at a sufficient level or more without increasing the size of the dissolution tank with respect to a decrease in the amount of metal tin.

そこで、本発明者等は、錫の充填方法について鋭意検討の結果なされたものであり、その要旨とするところは、特許請求の範囲に記載の通りの下記内容である。
（１）連続電気錫メッキラインにおける溶解槽に金属錫を充填して、前記溶解槽から供給すべき錫イオンの量に応じて、酸素吹込み量を調整する錫充填装置における錫充填方法において、
予め、前記溶解槽への酸素吹き込み量と吹き込んだ酸素を消費できる錫量との相関を求める工程１と、
予め、前記溶解槽に充填された充填層の上下差圧と溶解槽内の錫量との相関を求める工程２とを有し、
前記溶解槽への酸素吹き込み量を計測し、該酸素吹き込み量と前記工程１で求めた相関から最小錫量Ｓｎ min を算出し、
前記溶解槽に許容される錫量または溶解槽の外部に漏れない錫量を最大錫量Ｓｎmaxとし、
前記溶解槽に充填された充填層の上下差圧を測定し、該差圧値と前記工程２で求めた相関から前記溶解槽内の錫量を求め、該錫量が常時、最小錫量Ｓｎ min 以上、最大錫量Ｓｎ max 以下となるように、前記溶解槽に金属錫を充填することを特徴とする錫充填方法。 Accordingly, the present inventors have made extensive studies on the tin filling method, and the gist thereof is the following content as described in the claims.
(1) In a tin filling method in a tin filling apparatus that fills a dissolution tank in a continuous electric tin plating line with metal tin and adjusts an oxygen blowing amount according to the amount of tin ions to be supplied from the dissolution tank,
Step 1 for obtaining a correlation between the amount of oxygen blown into the dissolution tank and the amount of tin capable of consuming the blown oxygen in advance,
The step 2 for obtaining the correlation between the upper and lower differential pressure of the packed bed filled in the dissolution tank and the amount of tin in the dissolution tank in advance,
Measure the amount of oxygen blown into the dissolution tank, and calculate the minimum tin amount Sn min from the correlation obtained in step 1 with the amount of oxygen blown ,
The amount of tin allowed in the dissolution tank or the amount of tin that does not leak outside the dissolution tank is the maximum tin amount Sn max ,
The pressure difference between the upper and lower sides of the packed bed filled in the dissolution tank is measured, and the tin amount in the dissolution tank is determined from the correlation between the differential pressure value and the step 2, and the tin amount is always the minimum tin amount Sn. A tin filling method, wherein the melting tank is filled with metallic tin so as to be not less than min and not more than a maximum tin amount Sn max .

＜作用＞
本発明によれば、予め設定されたデータから最小錫量Ｓｎminを算出する。
これは、現状吹き込まれている酸素量と予め設定されたデータを用いて、この酸素量で溶解できる最小錫量Ｓｎminを算出する。一方、溶解槽に設けた圧力計により溶解槽内充填層上下の差圧を測定し、この差圧により溶解槽内の錫の充填量を把握する。そして、溶解槽に設定された溶解槽が許容できる錫量Ｓｎmaxと比較して、現状差圧にて測定した錫量ＳｎaがＳｎminでなければＳｎminになってからＳｎmaxになるまで金属錫の充填を行う錫充填量制御手段を有することにより、操業上要求される酸素吹込み量つまり溶存酸素濃度に対して充分な金属錫を常時溶解槽内に確保できるうえ、操業中の金属錫量減少に対して、溶解槽サイズを増大させることなく溶解槽内の金属錫量を充分量以上に保つことができる。 <Action>
According to the present invention, the minimum tin amount Sn min is calculated from preset data.
This calculates the minimum tin amount Sn min that can be dissolved by this oxygen amount using the oxygen amount currently blown in and the preset data. On the other hand, the pressure difference between the upper and lower layers in the dissolution tank is measured with a pressure gauge provided in the dissolution tank, and the filling amount of tin in the dissolution tank is determined from this differential pressure. Then, dissolution bath set to dissolving tank is compared with the acceptable tin content Sn max, until the tin amount Sn a measured at current differential pressure consist becomes Sn min unless Sn min to Sn max By having a tin filling amount control means for filling metallic tin, sufficient metal tin can be secured in the dissolution tank at all times with respect to the oxygen blowing amount required for operation, that is, dissolved oxygen concentration. The amount of metallic tin in the dissolution tank can be kept at a sufficient level or more without increasing the dissolution tank size with respect to the decrease in the amount of tin.

また、予め設定されたデータから最小錫量Ｓｎminを算出する。これは、現状吹き込まれている酸素量と予め設定されたデータを用いて、この酸素量で溶解できる最小錫量Ｓｎminを算出する。一方、溶解槽に設けた圧力形により溶解槽内充填層上下の差圧を測定し、この差圧により溶解槽内の錫の充填量を把握する。そして、溶解槽に設定された溶解槽が許容できる錫量Ｓｎmaxと比較して、現状差圧にて測定した錫量ＳｎaがＳｎminでも、Ｓｎmaxでもない場合、その量からＳｎmaxになるまで金属錫の充填を行うことにより、操業上要求される酸素吹込み量つまり溶存酸素濃度に対して充分な金属錫を常時溶解槽内に確保できるうえ、操業中の金属錫量減少に対して、溶解槽サイズを増大させることなく溶解槽内の金属錫量を充分量以上に保つことができる。 Further, the minimum tin amount Sn min is calculated from preset data. This calculates the minimum tin amount Sn min that can be dissolved by this oxygen amount using the oxygen amount currently blown in and the preset data. On the other hand, the pressure difference between the upper and lower layers in the dissolution tank is measured by the pressure form provided in the dissolution tank, and the amount of tin filled in the dissolution tank is determined from this differential pressure. Then, as compared with the tin content Sn max dissolution bath set to dissolving tank is acceptable tin content Sn a measured at current differential pressure even Sn min, when neither Sn max, the Sn max from the amount By filling the metal tin until it becomes, it is possible to always secure sufficient metal tin in the dissolution tank for the oxygen blowing amount required for operation, that is, the dissolved oxygen concentration, and to reduce the amount of metal tin during operation. Thus, the amount of metallic tin in the dissolution tank can be kept at a sufficient level or more without increasing the dissolution tank size.

本発明によれば、操業上要求される酸素吹込み量つまり溶存酸素濃度に対して充分な金属錫を常時溶解槽内に確保できるうえ、操業中の金属錫量減少に対して、溶解槽サイズを増大させることなく溶解槽内の金属錫量を充分量以上に保つことができる錫充填方法を提供することができ、具体的には下記のような産業上有用な著しい効果を奏する。 According to the present invention, sufficient metal tin can be secured in the dissolution tank at all times with respect to the oxygen blowing amount required for operation, that is, the dissolved oxygen concentration, and the dissolution tank size is reduced against the decrease in the amount of metal tin during operation. Thus, it is possible to provide a tin filling method capable of keeping the amount of metal tin in the dissolution tank at a sufficient level or more without increasing the amount of steel. Specifically, the present invention has the following industrially useful remarkable effects.

１）酸素吹込み量に対して充分な金属錫量を溶解槽内に常時確保することで常時スラッジ発生の少ない状態で操業が実現できる。
２）操業中の金属錫量の減少に対して溶解槽サイズを必要以上に大きくすることなく、溶存酸素量を減らすことができ、スラッジが減少する。
３）手動では困難な間隔にて錫粒投入が実現できる。 1) By always ensuring a sufficient amount of metallic tin in the dissolution tank with respect to the oxygen blowing amount, operation can be realized in a state where sludge is constantly generated.
2) The amount of dissolved oxygen can be reduced and sludge can be reduced without increasing the size of the dissolution tank more than necessary with respect to the decrease in the amount of metallic tin during operation.
3) Tin grains can be introduced at intervals that are difficult by hand.

本発明の錫充填装置の実施形態を例示する図である。It is a figure which illustrates embodiment of the tin filling apparatus of this invention. 本発明の錫充填方法の実施形態を例示する図である。It is a figure which illustrates embodiment of the tin filling method of this invention. 充填層内差圧と錫量の関係を示すグラフである。It is a graph which shows the relationship between the pressure difference in a packed bed, and the amount of tin. 吹き込まれる酸素量と溶解される錫量との関係を示すグラフである。It is a graph which shows the relationship between the oxygen amount blown in and the tin amount melt | dissolved. 本発明の錫充填方法における錫量の変化を例示する図である。It is a figure which illustrates the change of the amount of tin in the tin filling method of the present invention.

不溶性陽極9を用いた連続錫メッキラインにおいては、陽極からの錫の溶出が無いため、他の方法で錫イオンを連続的に供給する必要がある。その供給方法として、図１に示すように、ホッパー２-1から供給された金属錫（通常は粒状の金属錫）を充填した溶解槽１の中に酸素を溶存しためっき液を供給することで錫を溶解槽1内で溶解して、イオン化し、この錫イオンを電気めっき槽7内に供給して、電気めっき槽7内に配置されて不溶性電極9により帯電させてストリップ８にめっきする方法が取られている。金属錫は、溶解槽１にて溶解された後、メッキ液循環槽4に送られ、めっき槽供給ポンプ5により、電気めっき槽7に送られて、不溶性陽極9によりストリップ８の表面にめっきされる。 In a continuous tin plating line using the insoluble anode 9, since there is no elution of tin from the anode, it is necessary to continuously supply tin ions by another method. As its supply method, as shown in FIG. 1, a plating solution in which oxygen is dissolved is supplied into a dissolution tank 1 filled with metal tin (usually granular metal tin) supplied from a hopper 2-1. Method of dissolving and ionizing tin in the dissolution tank 1 and supplying the tin ions into the electroplating tank 7, placing in the electroplating tank 7, charging with the insoluble electrode 9, and plating on the strip 8 Has been taken. After being dissolved in the dissolution tank 1, the metal tin is sent to the plating solution circulation tank 4, sent to the electroplating tank 7 by the plating tank supply pump 5, and plated on the surface of the strip 8 by the insoluble anode 9. The

図１に示すような、この時溶解槽１内で起こる反応は酸性のめっき液を用いた場合下記（a）式のようになる。
Sn + 1/2O2 + H+ →Sn2+ + H2O ・・・（a） As shown in FIG. 1, the reaction occurring in the dissolution tank 1 at this time is represented by the following equation (a) when an acidic plating solution is used.
Sn + 1 / 2O 2 + H + → Sn 2+ + H 2 O (a)

しかし、この方法では過剰に酸素が供給された場合、錫イオンSn2+が酸化され、酸化錫（SnO2）が多く生成するという問題が有る。酸化錫（SnO2）は不溶性であり、スラッジとして沈殿しめっきには寄与しない。そのため、スラッジが増加すると原料原単位が悪化することとなる。
本発明者等は。このスラッジの発生量に影響を及ぼす要因について検討した結果、下記のように大きく二つ上げられることを見出し、本発明を完成させた。 However, in this method, when oxygen is supplied excessively, there is a problem that tin ions Sn 2+ are oxidized and a large amount of tin oxide (SnO 2 ) is generated. Tin oxide (SnO 2 ) is insoluble and precipitates as sludge and does not contribute to plating. Therefore, if the sludge increases, the raw material intensity will deteriorate.
The inventors. As a result of investigating factors affecting the amount of sludge generated, the present inventors have found that it can be greatly increased as follows.

１）めっき液中の溶存酸素量
めっき液中の溶存酸素量が多いと錫イオンSn2+の酸化がより起こりやすくなるため、溶存酸素濃度を下げることでスラッジの発生を抑制できる。
２）溶解槽内の金属錫量
溶解槽１内の金属錫が溶存酸素量に対して小量である場合、めっき液中の酸素が金属錫と反応しきれず、金属錫溶解に寄与しない溶存酸素が増えることとなり、スラッジが増加する。そのためめっき液中の酸素濃度に対して充分な金属錫が存在すればスラッジの発生を抑制できる。 1) The amount of dissolved oxygen in the plating solution When the amount of dissolved oxygen in the plating solution is large, tin ions Sn 2+ are more likely to be oxidized. Therefore, the generation of sludge can be suppressed by reducing the concentration of dissolved oxygen.
2) The amount of metal tin in the dissolution tank When the metal tin in the dissolution tank 1 is small relative to the amount of dissolved oxygen, the oxygen in the plating solution cannot react with the metal tin and does not contribute to metal tin dissolution. Will increase and sludge will increase. Therefore, the generation of sludge can be suppressed if sufficient metal tin is present relative to the oxygen concentration in the plating solution.

即ち、１）、２）より溶存酸素濃度つまり酸素の吹込み量に対して常に充分な金属錫が溶解槽１内に存在すればスラッジの発生を抑制できることを見出した。
しかし、１）に関して、酸素吹込み量は操業条件より定められる錫溶解速度（めっき量やラインスピードに依存）で設定されるため、常に小流量にて吹込みを行うのは困難である。 That is, from 1) and 2), it was found that the generation of sludge can be suppressed if sufficient metal tin is always present in the dissolution tank 1 with respect to the dissolved oxygen concentration, that is, the amount of oxygen blown.
However, with regard to 1), since the oxygen blowing amount is set at a tin dissolution rate (depending on the plating amount and line speed) determined by the operating conditions, it is difficult to always blow at a small flow rate.

２）については、錫は酸素吹込みによる溶解で減少するため、作業者が定期的錫の補給しているのが現状であり、作業者が溶解槽内錫を常に監視して充分量保つのは困難であり、（図5点線参照）また、変化分を見越した錫を事前充填するためには溶解槽サイズが増大することとなる。 As for 2), since tin is decreased by melting by blowing oxygen, the current situation is that the worker regularly replenishes tin, and the worker constantly monitors the tin in the melting tank to maintain a sufficient amount. (Refer to the dotted line in FIG. 5) In order to pre-fill with tin in anticipation of the change, the dissolution tank size will increase.

そこで、本発明の連続電気錫めっきラインにおける溶解槽１に金属錫を充填する錫充 填装置は、連続電気錫メッキラインにおける溶解槽に金属錫を充填して、前記溶解槽1 から供給すべき錫イオンの量に応じて、酸素吹込み量を調整する錫充填装置において、 予め設定されたデータから最小錫量Ｓｎminを算出する最小錫量算定手段と、前記溶解槽1に許容できる錫量を最大錫量Ｓｎmaxとし、前記溶解槽1に充填された充填層の上下差圧を測定する差圧測定手段と、該差圧側定手段により測定された差圧に基づいて算出された錫量ＳｎaがＳｎminでなければＳｎminになってから前記錫量Ｓｎmaxになるまで金属錫の充填を行う錫充填量制御手段とを有することを特徴とする。 Therefore, the tin filling apparatus for filling the melting tank 1 in the continuous electric tin plating line of the present invention with metallic tin should be filled from the melting tank 1 in the continuous electric tin plating line and supplied from the melting tank 1. In a tin filling device that adjusts the amount of oxygen blown in accordance with the amount of tin ions, minimum tin amount calculating means for calculating the minimum tin amount Sn min from preset data, and the tin amount allowable in the dissolution tank 1 Is the maximum tin amount Sn max, and the tin amount calculated based on the differential pressure measuring means for measuring the differential pressure in the upper and lower sides of the packed bed filled in the dissolution tank 1 and the differential pressure measured by the differential pressure side fixing means sn a is characterized by having a tin loading control means for filling the metallic tin after becoming sn min unless Sn min until the tin content Sn max.

そこで、本発明の連続電気錫めっきラインにおける溶解槽１に金属錫を充填する錫充填装置は、連続電気錫メッキラインにおける溶解槽に金属錫を充填して、前記溶解槽1から供給すべき錫イオンの量に応じて、酸素吹込み量を調整する錫充填装置において、予め設定されたデータから最小錫量Ｓｎminを算出する最小錫量算定手段と、前記溶解槽1に許容できる錫量を最大錫量Ｓｎmaxとし、前記溶解槽1に充填された充填層の上下差圧を測定する差圧測定手段と、該差圧側定手段により測定された差圧に基づいて算出された錫量ＳｎaがＳｎmaxでなければ、その量から前記錫量Ｓｎmaxになるまで金属錫の充填を行う錫充填量制御手段とを有することを特徴とする。 Therefore, the tin filling device for filling the melting tank 1 in the continuous electric tin plating line of the present invention with metallic tin fills the melting tank in the continuous electric tin plating line with the tin to be supplied from the melting tank 1. In a tin filling device that adjusts the oxygen blowing amount according to the amount of ions, minimum tin amount calculating means for calculating the minimum tin amount Sn min from preset data, and an allowable tin amount in the dissolution tank 1 A tin amount Sn max calculated based on a differential pressure measuring means for measuring the pressure difference between the upper and lower sides of the packed bed filled in the dissolution tank 1 and a differential pressure measured by the differential pressure side fixing means, with the maximum tin amount Sn max a is not the Sn max, and having a tin loading control means for filling the metallic tin from the amount until the tin content Sn max.

錫量がＳｎminの時に充填を開始しＳｎmaxになるまで金属錫の充填を行う錫充填量制御手段10を有することにより、操業上要求される酸素吹込み量つまり溶存酸素濃度に対して充分な金属錫を常時溶解槽１内に確保できるうえ、操業中の金属錫量減少に対して、溶解槽サイズを増大させることなく溶解槽１内の金属錫量を充分量以上に保つことができる錫充填装置を提供することができる。また、錫溶解槽１に、錫充填部入側と錫充填部出側の差圧を検知する差圧計3を取り付けることにより、遠隔操作により正確に溶解槽１内の金属錫の充填量を測定することができる。 By having the tin filling amount control means 10 that starts filling when the tin amount is Sn min and fills with Sn until it reaches Sn max , it is sufficient for the oxygen blowing amount required for operation, that is, the dissolved oxygen concentration. It is possible to always secure a sufficient amount of metallic tin in the dissolution tank 1 and to keep the amount of metal tin in the dissolution tank 1 at a sufficient level or less without increasing the size of the dissolution tank with respect to a decrease in the amount of metal tin during operation. A tin filling device can be provided. In addition, by attaching a differential pressure gauge 3 that detects the differential pressure between the tin filling part entry side and the tin filling part exit side to the tin dissolution tank 1, the amount of metal tin filled in the dissolution tank 1 is accurately measured by remote control. can do.

図２は、本発明の錫充填方法の実施形態を例示する図である。本発明の連続電気錫メッキラインにおける溶解槽に金属錫を充填する錫充填方法においては、まず、現状吹き込まれている酸素吹込み量から図4に示すグラフを用いて最小錫量Ｓｎminを算出する（Ｓ−１）。 FIG. 2 is a diagram illustrating an embodiment of the tin filling method of the present invention. In the tin filling method for filling the melting tank in the continuous electric tin plating line of the present invention with metal tin, first, the minimum tin amount Sn min is calculated from the currently blown oxygen blow amount using the graph shown in FIG. (S-1).

次に、前記溶解槽に溶解槽が許容できる最大錫量Ｓｎmaxを設定とする（Ｓ−２）。最大錫量Ｓｎmaxは溶解槽1に許容される錫量または溶解槽の外部に漏れない量に設定する。そして、最大錫量Ｓｎmaxの差圧を測定して、予め図３のように差圧と錫量の関係を設定しておく。そして前記溶解槽に設置した圧力計により充填された錫の充填層の上下圧力を測定して差圧を測定し（Ｓ−３）、この差圧により現状の溶解槽内の錫の充填量を図３のグラフにより算出する。そして錫量がＳｎmaxでなければＳｎmaxになるまで金属錫を溶解槽内に供給する。また、前記錫量がＳｎminの時に充填を開始しＳｎmaxになるまで金属錫の充填を行う（Ｓ−４）。 Next, the maximum tin amount Sn max allowable in the dissolution tank is set in the dissolution tank (S-2). The maximum tin amount Sn max is set to an amount allowed for the dissolution tank 1 or an amount that does not leak outside the dissolution tank. Then, the differential pressure of the maximum tin amount Sn max is measured, and the relationship between the differential pressure and the tin amount is set in advance as shown in FIG. Then, the differential pressure is measured by measuring the vertical pressure of the packed bed of tin filled with the pressure gauge installed in the dissolution tank (S-3), and the filling amount of tin in the current dissolution tank is determined by this differential pressure. This is calculated from the graph of FIG. And provides a metal tin dissolving tank until the amount of tin is Sn max unless Sn max. Further, filling is started when the amount of tin is Sn min and filling with tin is performed until Sn max is reached (S-4).

錫量がＳｎminまたはＳｎmaxでない場合、充填を開始しＳｎmaxになるまで金属錫の充填を行う錫充填量制御工程を有することにより、操業上要求される酸素吹込み量つまり溶存酸素濃度に対して充分な金属錫を常時溶解槽内に確保できるうえ、操業中の金属錫量減少に対して、溶解槽サイズを増大させることなく溶解槽内の金属錫量を充分量以上に保つことができる錫充填方法を提供することができる。 When the amount of tin is not Sn min or Sn max , the amount of injected oxygen, that is, the dissolved oxygen concentration required for operation is obtained by having a tin filling amount control step of filling metal tin until the filling reaches Sn max. In contrast, sufficient metal tin can be secured in the melting tank at all times, and the amount of metal tin in the melting tank can be kept at a sufficient level or less without increasing the size of the melting tank against the decrease in the amount of metal tin during operation. A tin filling method can be provided.

図１において、溶解槽1に供給されている吹込み酸素量Ｑを計測する。そして計測した吹込み酸素量Ｑにより予め設定されている図4のグラフから測定された吹込み酸素量で溶解できる錫量を最小錫量Ｓｎminとして算出する。次に、溶解槽1が許容できる最大錫量Ｓｎmaxを設定する。最大錫量Ｓｎmaxと溶解槽1内の差圧との関係を図3で予め設定しておく。 In FIG. 1, the blown oxygen amount Q supplied to the dissolution tank 1 is measured. Then, the tin amount that can be dissolved with the blown oxygen amount measured from the graph of FIG. 4 set in advance by the measured blown oxygen amount Q is calculated as the minimum tin amount Sn min . Next, the maximum tin amount Sn max allowable by the melting tank 1 is set. The relationship between the maximum tin amount Sn max and the pressure difference in the dissolution tank 1 is set in advance in FIG.

次に溶解槽1に設置した圧力計Ｐ１とＰ２を溶解槽１内の錫充填層11の上下に設け、錫充填層11の上下の圧力を測定して上下差圧計３にて差圧を算出する。算出した差圧から図3に示すグラフにより錫充填層11の現状の錫量Ｓｎaを求める。測定した錫量がＳｎminでなければ錫量がＳｎminになってから、Ｓｎmaxになるまで錫充填量制御手段により溶解槽1に設けた錫供給装置2の調整弁2-3を開いて溶解槽1内に自動的に錫を供給する。また、錫量ＳｎaがＳｎmaxに達していなければ、その時点から錫充填量制御手段により溶解槽1に設けた錫供給装置2の調整弁2-3を開いて溶解槽1内に自動的に錫を供給することもできる。錫供給量が溶解槽1の最大錫量Ｓｎmaxに達したら、調整弁2-3を閉じる。このように溶解槽1内の錫充填層11を差圧計3にて測定し、測定した差圧から予め設定したグラフに基づいて得られる錫量錫量ＳｎaがＳｎmaxでなければ、常に錫充填量をＳｎmaxになるように自動的に錫粒を投入することで、溶解槽内の充填量は吹込み酸素量で溶解する錫量以上の錫充填量を保つことができ、それに伴いスラッジの発生を常に抑制することができる。 Next, pressure gauges P1 and P2 installed in the dissolution tank 1 are provided above and below the tin-filled layer 11 in the dissolution tank 1, the pressure above and below the tin-filled layer 11 is measured, and the differential pressure is calculated by the upper-lower differential pressure gauge 3. To do. From the calculated differential pressure, the current tin amount Sn a of the tin-filled layer 11 is obtained from the graph shown in FIG. From the amount of the measured tin Sn min unless tin amount becomes Sn min, by opening the control valve 2-3 of tin supply device 2 provided in the dissolution tank 1 by tin loading control means until the Sn max Tin is automatically supplied into the dissolution tank 1. Furthermore, if the tin content Sn a has not reached the Sn max, automatically into the dissolving tank 1 by opening the control valve 2-3 of tin supply device 2 provided in the dissolution tank 1 by tin loading control means from that point It is also possible to supply tin. When the tin supply amount reaches the maximum tin amount Sn max of the melting tank 1, the regulating valve 2-3 is closed. Thus by measuring the tin filling layer 11 in the dissolution tank 1 at a differential pressure gauge 3, the tin content of tin content Sn a obtained based on the graph previously set from the measured differential pressure is not the Sn max, always tin By automatically adding tin grains so that the filling amount becomes Sn max , the filling amount in the dissolution tank can be maintained at a tin filling amount that is higher than the amount of tin dissolved by the amount of blown oxygen, and as a result, sludge is added. Can always be suppressed.

Ｓｎmaxと溶存酸素濃度については、予め設定したグラフ図３により算定すればよく、Ｓｎmaxの好ましい範囲は、溶解槽の外部金属錫を流出させないため設備容量もしくは溶解槽に設置した充填層の上限レベレ計で設定した量を設定すればよい。また、Ｓｎminについては、酸素量と酸素が溶解できる錫量を予め求めたグラフ図4に基づいて定めればよい。差圧計3による充填層内の差圧と錫充填量の関係については、図3に示すグラフにより算出することができる。差圧により充填層内の錫量を算出してＳｎmaxでなければ、常に錫充填量をＳｎmaxになるように自動的に錫粒を投入する。 The Sn max and the dissolved oxygen concentration may be calculated from the graph 3 set in advance, and the preferred range of Sn max is the capacity of the equipment or the upper limit of the packed bed installed in the dissolution tank so that the external metal tin does not flow out of the dissolution tank. What is necessary is just to set the amount set with the level meter. Further, Sn min may be determined based on the graph FIG. 4 in which the amount of oxygen and the amount of tin in which oxygen can be dissolved are obtained in advance. The relationship between the differential pressure in the packed bed by the differential pressure gauge 3 and the tin filling amount can be calculated from the graph shown in FIG. If the tin amount in the packed layer is calculated by the differential pressure and is not Sn max , tin grains are automatically charged so that the tin filling amount is always Sn max .

上記の本発明の実施形態により、操業上要求される酸素吹込み量つまり溶存酸素濃度に対して充分な金属錫を常時溶解槽内に確保できるうえ、操業中の金属錫量減少に対して、溶解槽サイズを増大させることなく溶解槽内の金属錫量を充分量以上に保つことができる錫充填装置および錫充填方法を提供することができる。 According to the above-described embodiment of the present invention, sufficient amount of metal tin can be secured in the dissolution tank at all times with respect to the amount of oxygen blown in operation, that is, dissolved oxygen concentration. It is possible to provide a tin filling apparatus and a tin filling method capable of keeping the amount of metal tin in the melting tank at a sufficient level or more without increasing the melting tank size.

１ 溶解槽
２ 錫供給装置
2-1ホッパ
2-2秤量装置
2-3調整弁
3 差圧計
4 メッキ液循環槽
5 溶解槽供給ポンプ
6 メッキ槽供給ポンプ
7 電気メッキ槽
8 ストリップ
9 不溶性陽極
10 錫充填量制御手段
11 錫充填層 1 Dissolution tank 2 Tin feeder
2-1 Hopper
2-2 Weighing device
2-3 Regulating valve
3 Differential pressure gauge
4 Plating solution circulation tank
5 Dissolution tank supply pump
6 Plating tank supply pump
7 Electroplating tank
8 strips
9 Insoluble anode
10 Tin filling amount control means
11 Tin-filled layer

Claims (1)

連続電気錫メッキラインにおける溶解槽に金属錫を充填して、前記溶解槽から供給すべき錫イオンの量に応じて、酸素吹込み量を調整する錫充填装置における錫充填方法において、
予め、前記溶解槽への酸素吹き込み量と吹き込んだ酸素を消費できる錫量との相関を求める工程１と、
予め、前記溶解槽に充填された充填層の上下差圧と溶解槽内の錫量との相関を求める工程２とを有し、
前記溶解槽への酸素吹き込み量を計測し、該酸素吹き込み量と前記工程１で求めた相関から最小錫量Ｓｎ min を算出し、
前記溶解槽に許容される錫量または溶解槽の外部に漏れない錫量を最大錫量Ｓｎmaxとし、
前記溶解槽に充填された充填層の上下差圧を測定し、該差圧値と前記工程２で求めた相関から前記溶解槽内の錫量を求め、該錫量が常時、最小錫量Ｓｎ min 以上、最大錫量Ｓｎ max 以下となるように、前記溶解槽に金属錫を充填することを特徴とする錫充填方法。 In a tin filling method in a tin filling apparatus that fills a dissolution tank in a continuous electric tin plating line with metal tin and adjusts the oxygen blowing amount according to the amount of tin ions to be supplied from the dissolution tank,
Step 1 for obtaining a correlation between the amount of oxygen blown into the dissolution tank and the amount of tin capable of consuming the blown oxygen in advance,
The step 2 for obtaining the correlation between the upper and lower differential pressure of the packed bed filled in the dissolution tank and the amount of tin in the dissolution tank in advance,
Measure the amount of oxygen blown into the dissolution tank, and calculate the minimum tin amount Sn min from the correlation obtained in step 1 with the amount of oxygen blown ,
The amount of tin allowed in the dissolution tank or the amount of tin that does not leak outside the dissolution tank is the maximum tin amount Sn max ,
The pressure difference between the upper and lower sides of the packed bed filled in the dissolution tank is measured, and the tin amount in the dissolution tank is determined from the correlation between the differential pressure value and the step 2, and the tin amount is always the minimum tin amount Sn. A tin filling method, wherein the melting tank is filled with metallic tin so as to be not less than min and not more than a maximum tin amount Sn max .
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