JPH01181000A - Method for removing impurity from zinc or zinc alloy electroplating solution - Google Patents
Method for removing impurity from zinc or zinc alloy electroplating solutionInfo
- Publication number
- JPH01181000A JPH01181000A JP380788A JP380788A JPH01181000A JP H01181000 A JPH01181000 A JP H01181000A JP 380788 A JP380788 A JP 380788A JP 380788 A JP380788 A JP 380788A JP H01181000 A JPH01181000 A JP H01181000A
- Authority
- JP
- Japan
- Prior art keywords
- zinc
- plating
- plating solution
- impurities
- soln
- 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.)
- Pending
Links
- 239000011701 zinc Substances 0.000 title claims abstract description 28
- 239000012535 impurity Substances 0.000 title claims abstract description 17
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 16
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000009713 electroplating Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title claims description 10
- 229910001297 Zn alloy Inorganic materials 0.000 title abstract 2
- 238000007747 plating Methods 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 4
- 235000014692 zinc oxide Nutrition 0.000 claims description 5
- 150000004649 carbonic acid derivatives Chemical class 0.000 claims description 3
- 150000004679 hydroxides Chemical class 0.000 claims description 3
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical class [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 claims 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 abstract description 10
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract description 7
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 229910052745 lead Inorganic materials 0.000 abstract description 5
- 239000011787 zinc oxide Substances 0.000 abstract description 5
- 229910052759 nickel Inorganic materials 0.000 abstract description 4
- 239000002244 precipitate Substances 0.000 abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 238000003756 stirring Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 229910007567 Zn-Ni Inorganic materials 0.000 description 4
- 229910007614 Zn—Ni Inorganic materials 0.000 description 4
- 230000003472 neutralizing effect Effects 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 150000001340 alkali metals Chemical class 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910000010 zinc carbonate Inorganic materials 0.000 description 3
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 3
- 229910000368 zinc sulfate Inorganic materials 0.000 description 3
- 239000011686 zinc sulphate Substances 0.000 description 3
- 235000009529 zinc sulphate Nutrition 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- ONIOAEVPMYCHKX-UHFFFAOYSA-N carbonic acid;zinc Chemical compound [Zn].OC(O)=O ONIOAEVPMYCHKX-UHFFFAOYSA-N 0.000 description 2
- 239000003014 ion exchange membrane Substances 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 235000011149 sulphuric acid Nutrition 0.000 description 2
- 239000011667 zinc carbonate Substances 0.000 description 2
- 235000004416 zinc carbonate Nutrition 0.000 description 2
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 1
- 101000993059 Homo sapiens Hereditary hemochromatosis protein Proteins 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003456 ion exchange resin Substances 0.000 description 1
- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- -1 oxide Chemical compound 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 159000000008 strontium salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
Landscapes
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、亜鉛系電気めっき浴の不純物除去方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for removing impurities from a zinc-based electroplating bath.
〈従来の技術〉
亜鉛系電気めっき（Ｚｎ、 Ｚｎ−Ｎｉ、 Ｚｎ−Ｆｅ
、 Ｚｎ −Ｍｎ等）は多くの場合、ｐＨ１〜３の硫酸
塩浴でめっきされるため、鋼板およびめっき装置の一部
が化学溶解され、めっき液中にＦｅが漸増する。<Conventional technology> Zinc-based electroplating (Zn, Zn-Ni, Zn-Fe
, Zn-Mn, etc.) is often plated in a sulfate bath with a pH of 1 to 3, so the steel sheet and a part of the plating equipment are chemically dissolved, and Fe gradually increases in the plating solution.
Ｆｅ分の多いめっき液より得られためっき鋼板の耐食性
、化成処理は著しく劣る。このため、めっき液中のＦｅ
イオンの除去方法として特公昭５７−２７１９８号およ
び特開昭５８−１７７４９９号に示されているように、
イオン交換膜による方法が一般的に行われている。The corrosion resistance and chemical conversion treatment of plated steel sheets obtained from plating solutions with a high Fe content are significantly inferior. For this reason, Fe in the plating solution
As a method for removing ions, as shown in Japanese Patent Publication No. 57-27198 and Japanese Patent Application Laid-open No. 58-177499,
A method using an ion exchange membrane is commonly used.
しかしながらこの方法は、設備費が高いこと、めっき液
中のストロンチウム塩やごみ等の夾雑物によりイオン交
換膜表面の目詰りを起こし易いこと、さらにイオン交換
樹脂の再生に手間がかかること、またその寿命も短いこ
と等問題点が多い。However, this method is expensive, the ion exchange membrane surface is easily clogged by impurities such as strontium salt and dust in the plating solution, and it takes time and effort to regenerate the ion exchange resin. There are many problems such as short lifespan.
〈発明が解決しようとする課題〉
本発明は亜鉛系電気めっき液中の主な不純物であるＦｅ
、 Ｎｉ、 Ｐｂ等の除去を簡便にかつ低コストで達成
し、めっき液を再生することを目的とするものである。<Problem to be solved by the invention> The present invention solves the problem of Fe, which is the main impurity in zinc-based electroplating solution.
, Ni, Pb, etc., easily and at low cost, and the purpose is to regenerate the plating solution.
く課題解決のための手段〉
本発明は、鋼帯に亜鉛を主成分とする金属を、硫酸塩浴
より電気めっきする場合のめっき液中に蓄積された不純
物を除去する際に、めっき液中に亜鉛の酸化物、水酸化
物または炭酸塩の何れか１種または２種以上を添加し、
ｐＨを調整することを特徴とする亜鉛系電気めっき液の
不純物除去方法である。Means for Solving the Problems> The present invention provides a method for removing impurities accumulated in a plating solution when electroplating a metal containing zinc as a main component onto a steel strip from a sulfate bath. Adding one or more of zinc oxide, hydroxide or carbonate to
This is a method for removing impurities from a zinc-based electroplating solution, which is characterized by adjusting the pH.
〈作 用〉
本発明者らは、めっき液中のＦｅを除去する方法として
中和除去法を種々検討した。<Function> The present inventors investigated various neutralization removal methods as methods for removing Fe in the plating solution.
中和剤としてアルカリ金属（Ｋ、Ｎａ）またはアルカリ
土類（Ｃａ１Ｍｇ、 Ｂａ）の酸化物、水酸化物または
炭酸塩を用いるとＦｅ分等の不純物は有効に除去される
が、めっき液中に中和塩としてアルカリ金属又はアルカ
リ土類の硫酸塩が蓄積していく欠点がある。Impurities such as Fe can be effectively removed by using oxides, hydroxides, or carbonates of alkali metals (K, Na) or alkaline earth metals (Ca, Mg, Ba) as neutralizing agents, but impurities such as Fe can be effectively removed from the plating solution. A drawback is that alkali metal or alkaline earth sulfates accumulate as neutralizing salts.
このため、本発明者らはめっき金属（Ｚｎ）の水酸化物
、酸化物または炭酸塩を中和剤として用いることに着目
し、本発明に至った。Therefore, the present inventors focused on using a hydroxide, oxide, or carbonate of the plating metal (Zn) as a neutralizing agent, and arrived at the present invention.
めっき液中にＺｎの酸化物、水酸化物または炭酸塩をｐ
、 Ｈが５．０〜７．７になるまで添加、撹拌し、沈澱
物を固液分離することでＦｅ等の不純物をめっき液系外
に取り除（ことができる。Zn oxide, hydroxide or carbonate is added to the plating solution.
By adding and stirring until H becomes 5.0 to 7.7, and separating the precipitate into solid and liquid, impurities such as Fe can be removed from the plating solution system.
因みに鋼板のめっき時、めっき液中に混入する元素のう
ち、除去すべき有害な元素の沈澱生成ｐＨは下表のとお
りである。Incidentally, among the elements mixed in the plating solution during plating of steel sheets, the precipitate formation pH of harmful elements to be removed is as shown in the table below.
これからＦｅ（ｎ）等は中和除去できることが判る。It can be seen from this that Fe(n) etc. can be neutralized and removed.
中和剤としてのアルカリ金属（Ｋ、Ｎａ）またはアルカ
リ土類（Ｃａ、 Ｍｇ、 Ｂａ、 Ｓｒ）の酸化物、水
酸化物または炭酸塩をめっき液中で溶解した場合、例え
ば次式のようになる。When an oxide, hydroxide or carbonate of alkali metal (K, Na) or alkaline earth (Ca, Mg, Ba, Sr) as a neutralizing agent is dissolved in the plating solution, for example, as shown in the following formula. Become.
２ＮａＯＨ＋ＦｅＳＯ４→Ｆｅ（ＯＨ）ｚ↓＋Ｎａ！Ｓ
Ｏ４（１）Ｎａ２ＣＯ３＋ＦｅＳＯ４＋ＨｚＯ→Ｆｅ（
ＯＨ） ２↓＋ＮａｚＳＯ４＋ ＣＯ２↑（２）これは
中和塩（Ｎａ２ＳＯ４）の蓄積によりめっき液の組成及
びめっき液の性質が変化するので好ましくない。2NaOH+FeSO4→Fe(OH)z↓+Na! S
O4(1)Na2CO3+FeSO4+HzO→Fe(
OH) 2↓+NazSO4+ CO2↑ (2) This is not preferable because the composition and properties of the plating solution change due to the accumulation of neutralized salt (Na2SO4).
一方、めっき金属（Ｚｎ）の酸化物、水酸化物または炭
酸塩を用いる場合には、例えば次式のようになり、
Ｈ２ＳＯ４＋ ＺｎＯ→ＺｎＳＯ４＋ Ｈ２Ｏ（３）ｕ
２ｓｏ４＋Ｚｎ（ＯＨ）２−＋ ＺｎＳＯ４＋２Ｈ２０
（４）Ｈ２ＳＯ４＋ ＺｎＣＯ３→ＺｎＳＯ４＋ Ｈ２
Ｏ＋ ＣＯ２↑ （５）ｐＨが上昇し、その結果例えば
次式のように有害元素が沈澱除去（加水分解）される。On the other hand, when using an oxide, hydroxide or carbonate of the plating metal (Zn), for example, the following formula is used: H2SO4+ ZnO→ZnSO4+ H2O(3)u
2so4+Zn(OH)2-+ ZnSO4+2H20
(4) H2SO4+ ZnCO3→ZnSO4+ H2
O+ CO2↑ (5) The pH increases, and as a result, harmful elements are precipitated and removed (hydrolyzed) as shown in the following equation.
Ｆｅ”＋２０Ｈ−→Ｆｅ（ＯＨ）ｚ↓
また、添加した酸化物、水酸化物または炭酸塩中のＺｎ
はＺｎ５Ｏｎ のＺｎとして、即ちめっき金属として有
効利用される。Fe”+20H−→Fe(OH)z↓ Also, Zn in the added oxide, hydroxide or carbonate
is effectively used as Zn in Zn5On, that is, as a plating metal.
不純物を除去しためっき液は、硫酸等によりＰＨを再調
整され、めっき浴槽中に再循環される。The pH of the plating solution from which impurities have been removed is readjusted using sulfuric acid or the like, and the plating solution is recycled into the plating bath.
〈実施例〉 ゛
実施例１
硫酸浴亜鉛めっき液（Ｚｎ１モル、 Ｎａ ３０ｇ ／
ｊＬＦｅ ５００ｍｇ／’ｊ！、 Ｐｂ ３ｍｇ／ｌ
、 Ｎｉ” ８００ｍｇ／ｊ！。<Example><Example1> Sulfuric acid bath zinc plating solution (1 mol of Zn, 30 g of Na/
jLFe 500mg/'j! , Pb 3mg/l
, Ni” 800mg/j!.
ｐＨ１，０）にＺｎＯを撹拌しながらｐＨ６，０になる
まで加え、濾過後のＦｅ、 Ｐｂ、 Ｎｉを分析した結
果、それぞれ２００■／ｌ、２■／／２． ５００■／
！まで低減できた。ZnO was added to the solution (pH 1.0) with stirring until the pH reached 6.0, and after filtration, Fe, Pb, and Ni were analyzed and found to be 200 μ/l and 2 μ/l, respectively. 500■/
! We were able to reduce it to
実施例２
実施例１の亜鉛めっき液にＺｎＣＣ１＋を撹拌しながら
ＰＨ６，０になるまで加え、濾過後のＦｅ、 Ｐｂ、
Ｎｉを分析した結果、それぞれ２１０ｍｇ／ ｌ 、
２ ｍｇ／ １ 。Example 2 ZnCC1+ was added to the zinc plating solution of Example 1 while stirring until the pH reached 6.0, and after filtration Fe, Pb,
As a result of Ni analysis, 210 mg/l, respectively.
2 mg/1.
４９０■／！まで低減できた。490■/! It was possible to reduce it to
実施例３
実施例１の亜鉛めっき液にＺｎ （ＯＨ） ２を撹拌し
ながらｐＨ６，０になるまで加え、濾過後のＦｅ、 Ｐ
ｂ。Example 3 Zn (OH) 2 was added to the zinc plating solution of Example 1 with stirring until the pH reached 6.0, and after filtration, Fe, P
b.
Ｎｉを分析した結果、それぞれ２０５■／ｆｆｉ、
２■／ｆｆｉ、５００■／！まで低減できた。As a result of Ni analysis, 205■/ffi,
2■/ffi, 500■/! We were able to reduce it to
実施例４
硫酸浴Ｚｎ−Ｎｉめっき液（Ｚｎ ＋ Ｎｉ １．５モ
ル、Ｎｉ／（Ｚｎ＋Ｎｉ） −０，５，Ｎａ ３０ ｇ
／ Ｅ 、Ｆｅ １，０００ｍｇ／ ｌ 。Example 4 Sulfuric acid bath Zn-Ni plating solution (Zn + Ni 1.5 mol, Ni/(Zn + Ni) -0.5, Na 30 g
/E, Fe 1,000 mg/l.
ｐＨ１，０）にＺｎＯを撹拌しながらｐＨ６，０まで加
え、濾過後に分析をした結果、Ｆｅが４００ｍｇ／１．
まで低減できた。ZnO was added to pH 1.0) with stirring until pH 6.0, and after filtration, analysis revealed that Fe was 400 mg/1.
We were able to reduce it to
実施例５
実施例４のＺｎ −Ｎｉめっき液にＺｎＣＯ３を撹拌し
ながらｐＨ６，０まで加え、濾過後に分析をした結果、
Ｆｅが４３０■／ｌまで低減できた。Example 5 ZnCO3 was added to the Zn-Ni plating solution of Example 4 with stirring until the pH reached 6.0, and the result was analyzed after filtration.
Fe was able to be reduced to 430■/l.
実施例６
実施例４のＺｎ−Ｎｉめっき液にＺｎ （ＯＨ） ｚ
を撹拌しながら、ｐＨ６，Ｏになるまで加え、濾過後に
分析をした結果、Ｆｅが４２０ｍｇ／Ｅまで低減できた
。Example 6 Zn (OH) z was added to the Zn-Ni plating solution of Example 4.
was added while stirring until the pH reached 6.0, and analysis after filtration showed that Fe was reduced to 420 mg/E.
〈発明の効果〉
以上のように、本発明は現在大量に生産されている亜鉛
系電気めっき鋼板のめっき液の再生に際して、主めっき
金属である亜鉛の酸化物、水酸化物、または炭酸塩をめ
っき液に添加することにより、容易にめっき液中のＦｅ
、 Ｐｂ、 Ｎｉ等の不純物の除去を可能にしたもので
あるが、これによって省資源がはかられ、低コストの廃
棄物処理ができるので、産業上有益な発明である。<Effects of the Invention> As described above, the present invention utilizes oxides, hydroxides, or carbonates of zinc, which is the main plating metal, when regenerating the plating solution for zinc-based electroplated steel sheets that are currently being produced in large quantities. By adding it to the plating solution, you can easily remove Fe from the plating solution.
This invention makes it possible to remove impurities such as , Pb, and Ni, which saves resources and enables low-cost waste treatment, making it an industrially useful invention.
特許出願人 川崎製鉄株式会社Patent applicant: Kawasaki Steel Corporation
Claims (1)
めっきする場合のめっき液中に蓄積された不純物を除去
する際に、めっき液中に亜鉛の酸化物、水酸化物または
炭酸塩の何れか１種または２種以上を添加し、ｐＨを調
整することを特徴とする亜鉛系電気めっき液の不純物除
去方法。When removing impurities accumulated in the plating solution when electroplating a metal whose main component is zinc on a steel strip using a sulfate bath, zinc oxides, hydroxides, or carbonates are removed from the plating solution. A method for removing impurities from a zinc-based electroplating solution, which comprises adding one or more of the following to adjust the pH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP380788A JPH01181000A (en) | 1988-01-13 | 1988-01-13 | Method for removing impurity from zinc or zinc alloy electroplating solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP380788A JPH01181000A (en) | 1988-01-13 | 1988-01-13 | Method for removing impurity from zinc or zinc alloy electroplating solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01181000A true JPH01181000A (en) | 1989-07-18 |
Family
ID=11567464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP380788A Pending JPH01181000A (en) | 1988-01-13 | 1988-01-13 | Method for removing impurity from zinc or zinc alloy electroplating solution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01181000A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0728853A1 (en) * | 1995-02-23 | 1996-08-28 | Sms Schloemann-Siemag Aktiengesellschaft | Process and apparatus for regenerating a sulfate electrolyte in galvanizing steel strips |
| US6284123B1 (en) * | 1998-03-02 | 2001-09-04 | Briggs & Stratton Corporation | Electroplating formulation and process for plating iron onto aluminum/aluminum alloys |
| CN103695971A (en) * | 2013-12-13 | 2014-04-02 | 武汉钢铁(集团)公司 | Method for reducing total iron concentration in zinc sulfate electroplating liquid |
-
1988
- 1988-01-13 JP JP380788A patent/JPH01181000A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0728853A1 (en) * | 1995-02-23 | 1996-08-28 | Sms Schloemann-Siemag Aktiengesellschaft | Process and apparatus for regenerating a sulfate electrolyte in galvanizing steel strips |
| US5690804A (en) * | 1995-02-23 | 1997-11-25 | Sms Schloemann-Siemag Aktiengesellschaft | Method and plant for regenerating sulfate electrolyte in steel strip galvanizing processes |
| US6284123B1 (en) * | 1998-03-02 | 2001-09-04 | Briggs & Stratton Corporation | Electroplating formulation and process for plating iron onto aluminum/aluminum alloys |
| CN103695971A (en) * | 2013-12-13 | 2014-04-02 | 武汉钢铁(集团)公司 | Method for reducing total iron concentration in zinc sulfate electroplating liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2386940C (en) | Process for reducing the concentration of dissolved metals and metalloids in an aqueous solution | |
| CA2079632A1 (en) | Method for the removal of chromium compounds from aqueous solutions | |
| US4664810A (en) | Method of separating heavy metals from complex-forming substances of aminocarboxylic acid type, or salts thereof in aqueous solutions | |
| JP5512482B2 (en) | Method for separating and recovering zinc from galvanizing waste liquid | |
| JPH01181000A (en) | Method for removing impurity from zinc or zinc alloy electroplating solution | |
| JPS6220868B2 (en) | ||
| US2845330A (en) | Method of recovering cyanides from waste aqueous solutions containing metal cyanides | |
| Gyliene et al. | Metal recovery from spent electroless plating solutions by oxalate precipitation | |
| EP0813500B1 (en) | Purification of metal containing solutions | |
| US4393029A (en) | Process for the production of an iron-free chronium (III) compound | |
| CA1327114C (en) | Method for precipitating and separating metals | |
| JPS5839894B2 (en) | Method for removing phosphorus and silicon from water-soluble smelting slag | |
| JPH073500A (en) | Method for recovering and regenerating tin plating solution | |
| RU2110487C1 (en) | Method for processing of exhausted solution comprising ions of heavy nonferrous metals or their alloys | |
| US20110272285A1 (en) | Method for the electrolytic deposition of chromium and chromium alloys | |
| SU1097696A1 (en) | Method for recovering copper and iron impurities from zinc sulfate solutions | |
| JPS60228627A (en) | Method for removing fluorine in wet treating of worthy metal | |
| SU1092195A1 (en) | Method for recovering zinc from blast furnace dust | |
| JP3905933B2 (en) | Treatment of selenium-containing wastewater | |
| JP2623616B2 (en) | Treatment of concentrated alkaline solution | |
| RU2352652C2 (en) | Processing method of sulphide zinc products | |
| JP3832168B2 (en) | Method for separating nickel from zinc sulfate solution | |
| KR100388033B1 (en) | Method for Extracting Hexavalent Chromium from Trivalent Chromium-Containing Wastewater Sludge | |
| JPS59190333A (en) | Treatment of solution containing metallic ion | |
| SU812752A1 (en) | Method of waste water purification from chromium |