JPH05179496A - Refining method for electrolytic galvanizing bath - Google Patents
Refining method for electrolytic galvanizing bathInfo
- Publication number
- JPH05179496A JPH05179496A JP99992A JP99992A JPH05179496A JP H05179496 A JPH05179496 A JP H05179496A JP 99992 A JP99992 A JP 99992A JP 99992 A JP99992 A JP 99992A JP H05179496 A JPH05179496 A JP H05179496A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- zinc powder
- plating bath
- metallic zinc
- coated
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 21
- 238000005246 galvanizing Methods 0.000 title abstract description 8
- 238000007670 refining Methods 0.000 title abstract description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000001914 filtration Methods 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000000725 suspension Substances 0.000 claims abstract description 3
- 238000007747 plating Methods 0.000 claims description 37
- 229910052725 zinc Inorganic materials 0.000 claims description 31
- 239000011701 zinc Substances 0.000 claims description 31
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 239000005909 Kieselgur Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims 2
- 239000011247 coating layer Substances 0.000 claims 1
- 239000012065 filter cake Substances 0.000 abstract description 5
- 238000011001 backwashing Methods 0.000 abstract description 4
- 238000011017 operating method Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 14
- 239000000243 solution Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 239000012535 impurity Substances 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000011550 stock solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000009700 powder processing Methods 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/06—Filtering particles other than ions
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電解亜鉛めっきに使用
されて劣化した電解浴、特にアルカリ性亜鉛めっき浴中
に蓄積した不純物を除去して再使用可能な亜鉛めっき浴
を回収するための電解亜鉛めっき浴の精製法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic bath for use in electrolytic zinc plating, which is deteriorated to remove impurities accumulated in an alkaline zinc plating bath to recover a reusable zinc plating bath. The present invention relates to a zinc plating bath refining method.
【０００２】[0002]
【従来の技術】鋼板等を防食するために亜鉛めっきを施
す方法が利用されており、性能の均一性などの点から溶
融亜鉛めっきよりも電解亜鉛めっき、特にアルカリ性亜
鉛めっきが好まれるに至っている。こうした電解亜鉛め
っき法においては、基材の表面から種々の金属イオンが
めっき浴中に溶出して蓄積するためにめっき浴が次第に
劣化し、電流密度の低い部分が黒くなったり、或いはめ
っき製品を更に耐食化するためのクロメート処理に際し
て黒化が著しくなるなどの不都合が生ずる。2. Description of the Related Art Galvanizing is used to prevent corrosion of steel sheets, etc., and electrolytic zinc plating, particularly alkaline zinc plating, has been preferred over hot dip galvanizing in terms of uniformity of performance. .. In such an electrolytic zinc plating method, various metal ions are eluted from the surface of the base material and accumulated in the plating bath, so that the plating bath is gradually deteriorated, a portion having a low current density becomes black, or the plated product is Further, in the chromate treatment for corrosion resistance, there is a problem that blackening becomes remarkable.
【０００３】そこで劣化したアルカリ性電解亜鉛めっき
浴を再使用可能なまでに精製することが行なわれてお
り、例えば弱い電解条件で亜鉛めっき浴を電解処理して
不純物を優先的に除去する方法や、例えば硫化アルカリ
溶液を添加して不純物を不溶性硫化物に転化し、或いは
金属亜鉛粉末を添加混合して不純物を不溶性の金属や金
属酸化物等に転化したのち、これらの不溶性析出物を濾
別するという化学的精製方法が用いられている。そして
そのうちでも、亜鉛めっき浴を汚染することが少ない金
属亜鉛粉末処理方法が好まれている。Therefore, the deteriorated alkaline electrolytic zinc plating bath is purified so that it can be reused. For example, a method of electrolytically treating the zinc plating bath under weak electrolytic conditions to remove impurities preferentially, For example, an alkali sulfide solution is added to convert impurities to insoluble sulfides, or metal zinc powder is added and mixed to convert impurities to insoluble metals or metal oxides, and then these insoluble precipitates are filtered off. That chemical purification method is used. Among them, a metal zinc powder processing method that does not pollute the galvanizing bath is preferred.
【０００４】上記のような金属亜鉛粉末を用いる化学的
精製方法においては生成する沈殿が微細であるために、
珪藻土等を濾過助材としてプリコートした濾材を備えた
濾過機を用いて、電解液中に残った金属亜鉛粉末と沈殿
とを一緒に加圧濾過して除く方法があるが、この方法で
は電解液と金属亜鉛粉末とを混合して反応させるための
装置が必要となる不利がある。そのため、プリコートし
た濾過助材層の上に更に金属亜鉛粉末を２次コートした
濾材を備えた濾過機を用いて劣化した電解亜鉛めっき浴
を濾過すると同時に反応させ、めっき浴の精製が終了し
たのちに濾材を取り外して洗浄することによって濾過助
材と金属亜鉛粉末と沈殿との混合物を洗い落とし、廃棄
処理するのが普通であった。In the chemical refining method using the zinc metal powder as described above, since the precipitate produced is fine,
Using a filter equipped with a filter material precoated with diatomaceous earth as a filter aid, there is a method of removing the metal zinc powder remaining in the electrolytic solution and the precipitate by pressure filtration together. There is a disadvantage in that a device for mixing and reacting with the zinc metal powder is required. Therefore, the deteriorated electrolytic zinc plating bath is filtered and reacted at the same time by using a filter equipped with a filter material in which metallic zinc powder is secondarily coated on the precoated filter aid layer, and after the plating bath is purified. It was usual to remove the filter medium and wash it to wash away the mixture of the filter aid, the metallic zinc powder and the precipitate, and dispose of it.
【０００５】しかしこのような回分式の濾過方法は多大
の作業労力が必要であり、運転効率も高めることができ
ないという欠点があるほか、洗浄液の処理が簡単でなく
環境汚染を引き起こしやすいという問題もあった。そこ
で濾材の自動逆洗が容易であって運転効率を高くするこ
とができる筒状濾材を設けた回分式濾過機を用いて電解
亜鉛めっき浴の濾過精製を行い、逆洗によって一時に排
出される濾過助材を含む濾滓の泥状混合物を別途用意し
たタンク式濾過脱液機に直送し、濾滓から濾液を回収す
ると同時に脱液濾滓を取り出す方法の採用が検討され
た。However, such a batch-type filtration method has a drawback that it requires a great amount of labor and cannot improve the operation efficiency, and that the cleaning liquid is not easily treated and environmental pollution is likely to occur. there were. Therefore, automatic backwashing of the filter medium is easy and operation efficiency can be improved. The electrolytic zinc plating bath is filtered and refined using a batch type filter equipped with a tubular filter medium, and is temporarily discharged by backwashing. It was considered to adopt a method in which a mud-like mixture of filter residue containing a filter aid was directly sent to a separately prepared tank-type filter dewatering machine to collect the filtrate from the filter residue and at the same time remove the dewatered filter residue.
【０００６】[0006]
【発明が解決しようとする課題】ところがこの方法で電
解亜鉛めっき浴の濾過精製を行ってみると、濾過脱液機
内で金属亜鉛粉末を含む脱液濾滓が空気と接触して発熱
反応を起こし、脱液機の濾材が損傷して自動運転ができ
ないという問題があることが判明した。However, when the electrolytic zinc plating bath is filtered and refined by this method, the dewatering filter containing metal zinc powder comes into contact with air in the filtering dewatering machine to cause an exothermic reaction. It was found that there was a problem that the filter material of the dewatering machine was damaged and automatic operation could not be performed.
【０００７】そこで本発明は、金属亜鉛粉末を濾材上に
コートした回分式濾過機を用いて劣化したアルカリ性電
解亜鉛めっき浴を精製するにあたって、濾過脱液機に損
傷を与えることなく安全に効率的な連続自動運転を実施
することができる改良された濾過機の運転方法を提供し
ようとするものである。Therefore, in purifying an alkaline galvanizing bath which has deteriorated by using a batch type filter in which a metal zinc powder is coated on a filter medium, the present invention is safe and efficient without damaging the filter dewatering machine. It is an object of the present invention to provide an improved method for operating a filter, which can perform continuous automatic operation.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
め、本発明の電解亜鉛めっき浴の精製法は、筒状濾材を
設けた回分式濾過機に金属亜鉛粉末をプリコートして電
解亜鉛めっき浴の濾過精製を行なった後、該回分式濾過
機を逆洗して該筒状濾材から脱離した金属亜鉛粉末を含
む懸濁液をタンク式濾過脱液機に直送し濾滓を分離回収
するに当たり、該筒状濾材にあらかじめ濾過助材のプリ
コートを行い、次いで該プリコート層上に金属亜鉛粉末
と濾過助材との混合物を２次コートするか又は金属亜鉛
粉末と濾過助材とを順次に２次コートし、しかるのちに
該めっき浴の濾過精製を行なうようにした。In order to achieve the above object, the electrolytic zinc plating bath according to the present invention is purified by electrolytic zinc plating by precoating a batch type filter equipped with a tubular filter medium with metallic zinc powder. After filtration and purification of the bath, the batch type filter is backwashed and the suspension containing the metal zinc powder desorbed from the tubular filter medium is directly sent to the tank type filter dewatering machine to separate and collect the filter residue. In doing so, the tubular filter medium is pre-coated with a filter aid in advance, and then the mixture of the metal zinc powder and the filter aid is secondarily coated on the precoat layer, or the metal zinc powder and the filter aid are sequentially coated. Secondly, the plating bath was then filtered and purified.
【０００９】本発明の電解亜鉛めっき浴の精製法におい
ては、濾過助材として珪藻土が用いられるが、その他パ
ーライトあるいはセルロース粉末等であっても良い。珪
藻土を用いるときは、少なくとも３５０ｇ／ｍ2 のプリ
コート層を形成したのちに金属亜鉛粉末を含む２次コー
ト層を形成することが望ましく、また、２次コート層中
の金属亜鉛粉末の含有量を７５重量％以下とすることが
更に好ましい。In the method for purifying the electrolytic zinc plating bath of the present invention, diatomaceous earth is used as a filter aid, but other perlite or cellulose powder may be used. When using diatomaceous earth, it is desirable to form a precoat layer of at least 350 g / m 2 and then form a secondary coat layer containing the metallic zinc powder. Also, the content of the metallic zinc powder in the secondary coat layer should be adjusted. It is more preferable to set it to 75% by weight or less.
【００１０】[0010]
【作用】本発明の電解亜鉛めっき浴の精製法によれば、
構造が簡単であって取扱が容易であることが知られてい
る回分式のタンク式濾過脱液機を用いて発熱を生ずるこ
となく濾滓の脱液を行うことができ、従って電解亜鉛め
っき浴を自動運転によって精製しながら安全に金属亜鉛
粉末含有濾滓ケーキを回収することができるようになっ
た。According to the method for purifying the electrolytic zinc plating bath of the present invention,
The batch-type tank-type filter dewatering machine, which is known to have a simple structure and is easy to handle, can be used to dewater the filter residue without causing heat generation, and therefore electrolytic zinc plating bath It became possible to safely recover the filter cake containing the metal zinc powder while purifying it by automatic operation.
【００１１】[0011]
【実施例】図１に示すような濾過装置を利用して、酸化
亜鉛２０ｇ／ｌ、水酸化ナトリウム２００ｇ／ｌを含む
アルカリ性電解亜鉛めっき浴の精製試験を実施した。図
において、Ａは径３．８cm、長さ８５cm、濾過面積０．
１ｍ2 のポリプロピレン織布製円筒状濾材Ａ1 を３７本
垂設した上部集液式の回分式濾過機、Ｂは液給送ポン
プ、Ｃは濾過助材調整槽、Ｄは濾過面積０．２３ｍ2 の
ポリプロピレン織布製円形袋状濾材を内部に展張したタ
ンク式濾過脱液機であり、Ｅは回収濾液貯槽である。EXAMPLE A refining test of an alkaline electrolytic zinc plating bath containing 20 g / l of zinc oxide and 200 g / l of sodium hydroxide was carried out by using a filtration device as shown in FIG. In the figure, A is 3.8 cm in diameter, 85 cm in length, and has a filtration area of 0.
An upper collection type batch type filtration machine in which 37 1 m 2 polypropylene woven cylindrical filter media A 1 are hung, B is a liquid feed pump, C is a filter aid adjusting tank, and D is a filtration area of 0.23 m. 2 is a tank type filter dewatering machine in which a circular bag-shaped filter material made of polypropylene woven fabric of 2 is spread, and E is a recovery filtrate storage tank.
【００１２】（比較例）運転に先立って濾過助材調整槽
Ｃに濾過助材として珪藻土２．５kgと水１５０kgとを入
れて濾過助材分散液を調製し、この分散液を配管ｉ−ポ
ンプＢ−配管ｅ−原液室Ａ2 −濾材Ａ1 −集液室Ａ3 −
配管ｃ−配管ｂの順に循環させて、濾材Ａ1 の面に濾過
助材をプリコートした（プリコート助材量６７５ｇ／ｍ
2 ）。次いで調整槽Ｃに金属亜鉛粉末１．５kgを入れて
上記と同様にして濾材Ａ1 のプリコート層上に２次コー
トした（２次コート亜鉛量４０５ｇ／ｍ2 ）。(Comparative Example) Prior to the operation, 2.5 kg of diatomaceous earth as a filter aid and 150 kg of water were put into a filter aid adjusting tank C to prepare a filter aid dispersion liquid, and this dispersion liquid was used as a pipe i-pump. B- piping e- stock room A 2 - filter medium A 1 - collecting liquid chamber A 3 -
By circulating in the order of the pipe c and the pipe b, the surface of the filter medium A 1 was precoated with the filter aid (the amount of the precoat aid was 675 g / m 2).
2 ). Next, 1.5 kg of metallic zinc powder was placed in the adjusting tank C, and secondarily coated on the precoat layer of the filter material A 1 in the same manner as described above (secondary coated zinc amount 405 g / m 2 ).
【００１３】このように準備した濾過機Ａに対して、劣
化亜鉛めっき液をポンプＢにより配管ｅを経て濾過機Ａ
の原液室Ａ2 に供給し、濾材Ａ1 で濾過して集液室Ａ3
−配管ｃ−配管ｆ−配管ｇを経て精製めっき液を回収し
た。こうしてめっき液の精製を終了したのち、加圧空気
を配管ａから配管ｃを経て集液室Ａ3 に供給し、バルブ
Ｆを急激に開放して原液室Ａ2 内のめっき液を配管ｄを
経て濾過脱液機Ｄに落とすと同時に、集液室Ａ3 内に残
っていた精製めっき液を逆流させて濾材Ａ1 上の珪藻土
や金属亜鉛粉末を剥離させ、これらの泥状物をすべて濾
過脱液機Ｄに流し出した。With respect to the thus-prepared filter A, the deteriorated galvanizing solution is pumped by the pump B through the pipe e to the filter A.
To the stock solution chamber A 2 and filtered with the filter material A 1 to collect the solution in the collection chamber A 3.
The purified plating solution was recovered through-pipe c-pipe f-pipe g. After the purification of the plating solution is completed in this way, pressurized air is supplied from the pipe a to the liquid collection chamber A 3 via the pipe c, the valve F is rapidly opened, and the plating liquid in the stock solution chamber A 2 is supplied to the pipe d. At the same time, the purified plating solution remaining in the collection chamber A 3 is caused to flow backward to remove the diatomaceous earth and metallic zinc powder on the filter material A 1 and to filter out all these mud matters. It was poured into the drainer D.
【００１４】こうして濾過機Ａの逆洗を終了したのちバ
ルブＦを閉じ、加圧空気を配管ａ−配管ｆ−配管ｈを経
て濾過脱液機Ｄに供給し、空気加圧により金属亜鉛粉末
を含む泥状物の脱液を行った。脱液終了後、濾過脱液機
Ｄの蓋を開けて内部の濾滓を取り出したところ、濾滓の
温度が２００℃を超えており、濾布が一部溶融してい
た。After the backwashing of the filter A is completed in this way, the valve F is closed and pressurized air is supplied to the filter drainer D through the pipe a-pipe f-pipe h, and the metallic zinc powder is pressurized by air to remove the metallic zinc powder. The mud containing material was deliquored. After completion of the deliquoring, when the lid of the filter deliquoring machine D was opened and the filter residue inside was taken out, the temperature of the filter residue exceeded 200 ° C and the filter cloth was partially melted.
【００１５】（第１実施例）運転に先立って、濾過助材
として珪藻土１．４kgを濾材Ａ1 の面にプリコートし
（プリコート助材量３８０ｇ／ｍ2 ）、次いで金属亜鉛
粉末１．５kgと珪藻土１．１kgとの混合物を濾材Ａ1 の
プリコート層上に２次コートした（２次コート助材量３
００ｇ／ｍ2 、２次コート亜鉛量４０５ｇ／ｍ2 ）。(First Example) Prior to the operation, 1.4 kg of diatomaceous earth as a filter aid was pre-coated on the surface of the filter material A 1 (pre-coat aid amount 380 g / m 2 ), and then 1.5 kg of metallic zinc powder was added. A mixture with 1.1 kg of diatomaceous earth was secondarily coated on the precoat layer of the filter medium A 1 (secondary coating aid amount 3
00 g / m 2 , secondary coating zinc amount 405 g / m 2 ).
【００１６】次いで比較例と全く同様な手順で劣化めっ
き液の精製を行い、更に濾材Ａ1 の逆洗と濾滓の脱液と
を行った。そして濾過脱液機Ｄの蓋を開けて内部の濾滓
を取り出したところ、濾滓の温度が僅かに温かい程度で
あったほか、濾過脱液機には何等の異常も見られなかっ
た。Then, the deteriorated plating solution was purified by the same procedure as in the comparative example, and the filter material A 1 was backwashed and the filter residue was drained. Then, when the lid of the filter dewatering machine D was opened and the filter cake inside was taken out, the temperature of the filter cake was slightly warm, and no abnormality was found in the filter dewatering machine.
【００１７】（第２実施例）運転に先立って、濾過助材
として珪藻土１．４kgを濾材Ａ1 の面にプリコートし
（プリコート助材量３８０ｇ／ｍ2 ）、次いで金属亜鉛
粉末１．５kgを濾材Ａ 1 のプリコート層上にコートし
（２次コート亜鉛量４０５ｇ／ｍ2 ）、更に珪藻土１．
１kgをその上に重ねてコートした（２次コート助材量３
００ｇ／ｍ2 ）。(Second Embodiment) Prior to operation, a filter aid
Diatomaceous earth 1.4kg as filter medium A1Pre-coated on the surface of
(Amount of precoat auxiliary material 380 g / m2), Then metallic zinc
1.5 kg of powder as filter medium A 1Coated on the precoat layer of
(Secondary coated zinc amount 405 g / m2), And diatomaceous earth 1.
1 kg was coated on top of it (secondary coating aid amount 3
00 g / m2).
【００１８】次いで比較例と全く同様な手順で劣化めっ
き液の精製を行い、更に濾材Ａ1 の逆洗と濾滓の脱液と
を行った。そして濾過脱液機Ｄの蓋を開けて内部の濾滓
を取り出したところ、第１実施例の場合と同様に何等の
異常も見られなかった。Then, the deteriorated plating solution was purified by the same procedure as in the comparative example, and the filter material A 1 was backwashed and the filter residue was drained. Then, when the lid of the filter dewatering device D was opened and the filter cake inside was taken out, no abnormality was observed as in the case of the first embodiment.
【００１９】[0019]
【発明の効果】本発明の電解亜鉛めっき浴の精製法は、
金属亜鉛粉末を用いるめっき浴の化学的精製法において
亜鉛粉末の異常発熱を抑制することができるので、装置
に何等の損傷をも与えることがなく、自動運転によって
効率的な濾過処理が可能となり、また安全な濾過助材の
廃棄処理が可能となったので、環境汚染発生の恐れもな
く経済的に極めて有利である。The method for purifying the electrolytic zinc plating bath of the present invention comprises:
Since it is possible to suppress abnormal heat generation of zinc powder in the chemical refining method of the plating bath using metal zinc powder, it is possible to perform efficient filtration processing by automatic operation without damaging the device. Further, since it is possible to safely dispose of the filter aid, there is no fear of environmental pollution, which is economically extremely advantageous.
【図１】本発明の電解亜鉛めっき浴の精製法を実施する
ための濾過精製装置の構成図である。FIG. 1 is a configuration diagram of a filtration and purification device for carrying out a method for purifying an electrolytic zinc plating bath of the present invention.
Ａ 上部集液式回分式濾過機 Ａ1 濾材 Ａ2 原液室 Ａ3 集液室 Ｂ めっき浴給送ポンプ Ｃ 濾過助材調整槽 Ｄ タンク式濾過脱液機 Ｅ 回収濾液貯槽 Ｆ バルブ ａ〜ｉ 配管A Upper collection type batch type filtration machine A 1 Filter medium A 2 Stock solution chamber A 3 Collection chamber B Plating bath feeding pump C Filter auxiliary material adjusting tank D Tank type filtration dewatering machine E Recovery filtrate storage tank F Valve a to pipe
Claims (3)
鉛粉末をプリコートして電解亜鉛めっき浴の濾過精製を
行なった後、該回分式濾過機を逆洗して該筒状濾材から
脱離した金属亜鉛粉末を含む懸濁液をタンク式濾過脱液
機に直送し濾滓を分離回収するに当たり、該筒状濾材に
あらかじめ濾過助材のプリコートを行い、次いで該プリ
コート層上に金属亜鉛粉末と濾過助材との混合物を２次
コートするか又は金属亜鉛粉末と濾過助材とを順次に２
次コートし、しかるのちに該めっき浴の濾過精製を行な
うことを特徴とする電解亜鉛めっき浴の精製法。1. A batch type filter provided with a tubular filter medium is pre-coated with metallic zinc powder to filter and purify an electrolytic zinc plating bath, and then the batch type filter is backwashed to remove the tubular filter medium from the tubular filter medium. When the suspension containing the desorbed metal zinc powder is directly sent to a tank type filter dewatering machine to separate and collect the filter residue, the tubular filter medium is pre-coated with a filter aid, and then the metal is applied on the pre-coated layer. Secondary coating with a mixture of zinc powder and filter aid or sequentially adding zinc metal powder and filter aid.
A method for purifying an electrolytic zinc plating bath, which comprises the steps of subsequent coating, followed by filtration and purification of the plating bath.
も３５０ｇ／ｍ2 のプリコート層を形成する請求項１記
載の電解亜鉛めっき浴の精製法。 2. The method for purifying an electrolytic zinc plating bath according to claim 1, wherein diatomaceous earth is used as a filter aid to form a precoat layer of at least 350 g / m 2 .
を７５重量％以下とする請求項１又は２記載の電解亜鉛
めっき浴の精製法。3. The method for purifying an electrolytic zinc plating bath according to claim 1, wherein the content of the metallic zinc powder in the secondary coating layer is 75% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP99992A JPH0784679B2 (en) | 1992-01-07 | 1992-01-07 | Purification method of electrolytic zinc plating bath |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP99992A JPH0784679B2 (en) | 1992-01-07 | 1992-01-07 | Purification method of electrolytic zinc plating bath |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05179496A true JPH05179496A (en) | 1993-07-20 |
| JPH0784679B2 JPH0784679B2 (en) | 1995-09-13 |
Family
ID=11489291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP99992A Expired - Fee Related JPH0784679B2 (en) | 1992-01-07 | 1992-01-07 | Purification method of electrolytic zinc plating bath |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0784679B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000032850A1 (en) * | 1998-11-30 | 2000-06-08 | Ebara Corporation | Plating machine |
| US9303329B2 (en) | 2013-11-11 | 2016-04-05 | Tel Nexx, Inc. | Electrochemical deposition apparatus with remote catholyte fluid management |
-
1992
- 1992-01-07 JP JP99992A patent/JPH0784679B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000032850A1 (en) * | 1998-11-30 | 2000-06-08 | Ebara Corporation | Plating machine |
| US6379520B1 (en) | 1998-11-30 | 2002-04-30 | Ebara Corporation | Plating apparatus |
| USRE39123E1 (en) * | 1998-11-30 | 2006-06-13 | Ebara Corporation | Plating apparatus |
| US9303329B2 (en) | 2013-11-11 | 2016-04-05 | Tel Nexx, Inc. | Electrochemical deposition apparatus with remote catholyte fluid management |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0784679B2 (en) | 1995-09-13 |
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