JPH0487685A - Treatment of used galvanizing solution - Google Patents
Treatment of used galvanizing solutionInfo
- Publication number
- JPH0487685A JPH0487685A JP20370590A JP20370590A JPH0487685A JP H0487685 A JPH0487685 A JP H0487685A JP 20370590 A JP20370590 A JP 20370590A JP 20370590 A JP20370590 A JP 20370590A JP H0487685 A JPH0487685 A JP H0487685A
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- waste liquid
- neutralizing
- tank
- ferric hydroxide
- 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
- 238000005246 galvanizing Methods 0.000 title claims abstract description 19
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 35
- 239000011701 zinc Substances 0.000 claims abstract description 35
- 229960004887 ferric hydroxide Drugs 0.000 claims abstract description 29
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 23
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910001447 ferric ion Inorganic materials 0.000 claims abstract description 9
- 239000011268 mixed slurry Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 40
- 239000002699 waste material Substances 0.000 claims description 39
- 238000007747 plating Methods 0.000 claims description 17
- 239000007864 aqueous solution Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 6
- -1 iron ions Chemical class 0.000 claims description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 4
- 229910001448 ferrous ion Inorganic materials 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000706 filtrate Substances 0.000 abstract description 9
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 abstract description 3
- 239000000725 suspension Substances 0.000 abstract 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 20
- 229910052759 nickel Inorganic materials 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 8
- 239000000920 calcium hydroxide Substances 0.000 description 8
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 8
- 235000011116 calcium hydroxide Nutrition 0.000 description 8
- 239000002244 precipitate Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、亜鉛めっき廃液の処理〜方法に関する。[Detailed description of the invention] <Industrial application field> The present invention relates to a method for treating zinc plating waste liquid.
〈従来の技術〉
亜鉛めっき廃液は、めっき液の老化における入れかえに
よる廃棄や、濃度低下等を防止するためのめっき液補充
にともなうめつき液の一部廃棄によって生しる。<Prior Art> Zinc plating waste solution is generated by discarding a plating solution by replacing it as it ages, or by discarding a portion of the plating solution when replenishing the plating solution to prevent a decrease in concentration.
亜鉛めっき廃液には、通常高濃度の亜鉛成分と亜鉛量の
１／１０程度のニッケル成分が含まれている。 ｐＨは
約２である。Galvanizing waste liquid usually contains a high concentration of zinc component and a nickel component that is about 1/10 of the amount of zinc. The pH is approximately 2.
この廃液は、拡散透析法、イオン交換法などの膜性等で
有効成分が回収されてはいるものの、大部分は？２単な
消石灰等による中和法で処理されている（例えば、特開
昭６１−１０４１００号公報参照）。 中和のＰＨは９
〜１０程度で行われ、生成した亜鉛沈澱物を分離後、分
離水は排水基準であるｐＨ＝７程度まで逆中和して排出
されている。Although the active ingredients of this waste liquid are recovered using membrane techniques such as diffusion dialysis and ion exchange, what is the majority of it? It is treated by a neutralization method using simple slaked lime or the like (see, for example, Japanese Patent Application Laid-open No. 104100/1983). Neutralization pH is 9
After separating the generated zinc precipitate, the separated water is reverse neutralized to a pH of about 7, which is the drainage standard, and then discharged.
〈発明が解決しようとする課題〉
このような中和処理法は、亜鉛沈澱物の難脱水性等の問
題がある。<Problems to be Solved by the Invention> Such a neutralization treatment method has problems such as difficulty in dewatering the zinc precipitate.
すなわち、亜鉛、アルミニウム等はアルカリ中和により
コロイド状沈＃（ゼリー状の沈澱分子中に水か抱きこま
わる）となり濾過性が悪くなる。That is, when zinc, aluminum, etc. are neutralized with alkali, they become colloidal precipitates (water is trapped in jelly-like precipitated molecules), resulting in poor filterability.
その結果、中和処理後の排水中に亜鉛か残存するという
問題がある。As a result, there is a problem that zinc remains in the wastewater after neutralization treatment.
本発明の目的は、上述した従来技術の欠点を解消して、
亜鉛めっき廃液と水酸化第２鉄を含むスラリーとを効果
的に混合、中和処理し排水中の亜鉛濃度を減少させる亜
鉛めっき廃液の処理方法を提供するものである。The purpose of the present invention is to overcome the above-mentioned drawbacks of the prior art,
The present invention provides a method for treating zinc plating waste liquid, which effectively mixes and neutralizes the zinc plating waste liquid and a slurry containing ferric hydroxide to reduce the concentration of zinc in waste water.
＜課題を解決するための手段〉
上記目的を達成するために本発明によれば、亜鉛めっき
廃液を中和処理するに際し、該廃液を水酸化第２鉄を含
有するスラリーと混合した後、該混合スラリーを中和す
ることを特徴とする亜鉛めっき廃液の処理方法か提供さ
れる。<Means for Solving the Problems> In order to achieve the above object, according to the present invention, when neutralizing galvanizing waste liquid, after mixing the waste liquid with a slurry containing ferric hydroxide, A method for treating galvanizing waste liquid is provided, the method comprising neutralizing a mixed slurry.
また、本発明によれは、亜鉛めっき廃液を中和処理する
に際し、該廃液を水酸化第２鉄を含有するスラリーと混
合した後、該混合スラリーを中和し、生成した固形分を
分離除去して得られる水溶液と、第１鉄イオンを含有す
る水溶液を酸化しｐＨを調整して得られる水酸化第２鉄
が懸濁した第２鉄イオン含有水溶液とを混合した後、該
混合液を中和することを特徴とする亜鉛めっき廃液の処
理方法が提供される。Further, according to the present invention, when neutralizing galvanizing waste liquid, the waste liquid is mixed with a slurry containing ferric hydroxide, and then the mixed slurry is neutralized, and the generated solid content is separated and removed. After mixing the resulting aqueous solution with a ferric ion-containing aqueous solution in which ferric hydroxide is suspended, which is obtained by oxidizing the ferrous ion-containing aqueous solution and adjusting the pH, the mixed solution is mixed. A method for treating galvanizing waste liquid is provided, which is characterized by neutralizing it.
ここで、前記水酸化第２鉄を含有するスラリーは、第１
鉄イオンを含有する水溶液を酸化しｐＨを調整し、該第
１鉄イオンが水酸化第２鉄として析出したスラリーであ
るのが好ましい。Here, the slurry containing ferric hydroxide is
It is preferable to use a slurry in which an aqueous solution containing iron ions is oxidized to adjust the pH, and the ferrous ions are precipitated as ferric hydroxide.
以下に本発明をさらに詳細に説明する。The present invention will be explained in more detail below.
本発明において亜鉛めっき廃液とは、少なくとも亜鉛を
含むめっき廃液であり、高濃度の亜鉛成分にニッケル等
を含んだ合金めっき廃液を含むものである。In the present invention, the zinc plating waste liquid is a plating waste liquid containing at least zinc, and includes an alloy plating waste liquid containing nickel and the like in addition to a high concentration of zinc.
ここで、亜鉛めっき廃液との混合に使用する水酸化第２
鉄を含有するスラリーは、第２鉄塩（ＦｅＣｌ１３ ま
たはＦｅ２（ＳＯ４ｐｓ ）をアルカリで処理して生成
した沈澱生成物（例えば、沈澱物組成がＦｅ″″３２５
〜３５％、Ｃａ ２０〜２５％、ＳｉＯ２２〜３％）が
使用可能であるか、これに限るものではない。Here, the hydroxide secondary used for mixing with the galvanizing waste liquid
The iron-containing slurry is a precipitated product produced by treating a ferric salt (FeCl13 or Fe2(SO4ps)) with an alkali (for example, if the precipitate composition is
35%, Ca 20-25%, SiO2 2-3%), but is not limited thereto.
前記第２鉄塩（ＦｅＣ″ｌまたはＦｅ２（ＳＪ）３）は
、従来水処理設備の凝集剤として広く利用されてきたが
、最近では高分子凝集剤にかわフてきた。 従って、こ
れらの塩を有効利用することは好ましい。The ferric salts (FeC″l or Fe2(SJ)3) have conventionally been widely used as flocculants in water treatment equipment, but recently they have been replaced by polymer flocculants. It is preferable to use it effectively.
そこで、水酸化第２鉄のスラリーが他の金属水酸化物の
生成の際に凝集効果があることに着目し、亜鉛めっき廃
液と混合、中和を行ってみた。 用いた水酸化第２鉄の
スラリーは、水処理設備から得られたスラリーで、濃度
は４ｗｔ％以下のものである。Therefore, we focused on the fact that ferric hydroxide slurry has a flocculating effect during the production of other metal hydroxides, and tried mixing it with zinc plating waste liquid and neutralizing it. The ferric hydroxide slurry used was obtained from a water treatment facility and had a concentration of 4 wt% or less.
本発明て用いる中和剤としては、水酸化ナトリウム、水
酸化カルシウム等のアルカリで、具体的には消石灰、カ
ーバイト滓なとを挙げることができる。The neutralizing agent used in the present invention is an alkali such as sodium hydroxide or calcium hydroxide, and specific examples include slaked lime and carbide slag.
亜鉛めっき廃液と水酸化第２鉄を含有するスラリーとを
混合、中和（ｐＨ＝１０以上）処理し、生成した固形分
を分離した濾液中の溶解亜鉛濃度は、亜鉛めっき廃液を
単独に中和（ｐＨ＝１ｏ以上）ＩＡ理し、生成した固形
分を分離した濾液中の溶解亜鉛濃度と比較してほぼ１／
１０〜１１５０に減少させることができる。 なお、前
記中和時のｐＨを１０以上とするのは、１０未満では固
形分の生成が十分てないからである。The concentration of dissolved zinc in the filtrate obtained by mixing the zinc plating waste liquid and a slurry containing ferric hydroxide and neutralizing it (pH = 10 or more) and separating the generated solids is the same as that of the zinc plating waste liquid alone. The concentration of dissolved zinc in the filtrate from which the solid content was separated by IA treatment (pH = 1o or more) was approximately 1/1
10-1150. The reason why the pH at the time of neutralization is set to 10 or more is because if it is less than 10, solid content is not sufficiently generated.
つぎに、前記固形分を分離した濾液を水酸化第２鉄が懸
濁した第２鉄イオン含有水溶液に投入して、ｐＨ＝７〜
８に調整することにより、溶液中の溶解亜鉛濃度を１／
ＩＯＰＰＭ以下とすることかでざる。Next, the filtrate from which the solid content has been separated is poured into a ferric ion-containing aqueous solution in which ferric hydroxide is suspended, and the pH is adjusted to between 7 and 7.
By adjusting the concentration of dissolved zinc in the solution to 1/8,
It doesn't matter if it is less than IOPPM.
前記第２鉄イオン含有水溶液としては、例えば製鉄工場
等で発生する酸洗廃液処理におけろ水処理設備において
第１鉄イオンを含むリンス溶液の酸化−１次中和（ｐＨ
＝４程度の中和）処理液などが利用できる。 この場合
は水処理２次中和槽と沈降槽をそのまま利用することが
できる。Examples of the ferric ion-containing aqueous solution include oxidation and primary neutralization (pH
= neutralization of about 4) treatment liquid etc. can be used. In this case, the secondary water treatment neutralization tank and sedimentation tank can be used as they are.
第１図は、本発明の亜鉛めっき廃液の処理方法の一実施
例を示すフロー図である。FIG. 1 is a flow diagram showing one embodiment of the method for treating galvanizing waste liquid of the present invention.
原料タンク１からポンプ２を経て亜鉛めっき廃液ＭをＮ
ｏ、１中和Ｍ３に供給する。 そゎと同時に水酸化第２
鉄を含有するスラリー５１をＮ０１１中和糟３に供給す
る。 その際、混合をよくするため、ラインミキサーに
より両液の混合を促進するとよい。Galvanizing waste liquid M is transferred from raw material tank 1 through pump 2 to N.
o, 1 feed to neutralized M3. At the same time, the second hydroxide
A slurry 51 containing iron is supplied to the N011 neutralization pot 3. At this time, in order to improve mixing, it is recommended to use a line mixer to promote mixing of both liquids.
前記混合液はＮｏ、１中和糟３からＮＯ１２中和Ｎ４へ
移送される。 各中和ａｉ３．４ては逐次、中和剤Ｎが
添加され中和されるが、ＮＯ１２中和槽４で反応が完結
するように制御する。 その時のｐＨは１０〜１１であ
る。The mixed liquid is transferred from the No. 1 neutralization tank 3 to the NO. 12 neutralization tank N4. In each neutralization ai3.4, neutralizing agent N is successively added and neutralized, but the reaction is controlled so as to be completed in the NO12 neutralization tank 4. The pH at that time is 10-11.
原料廃液Ｍと水酸化第２鉄を含有するスラリーＳ、の混
合割合は１：６〜１０か好適である。 スラリーの混合
割合が６未満ては亜鉛との共沈効果が不十分てあり、１
０を超えても向上効果が得られない。The mixing ratio of the raw material waste liquid M and the slurry S containing ferric hydroxide is preferably 1:6 to 10. If the mixing ratio of the slurry is less than 6, the co-precipitation effect with zinc is insufficient, and 1
Even if it exceeds 0, no improvement effect can be obtained.
Ｎ ｏ 、 １ 中和＠ ３、Ｎ ｏ 、 ２ 中
和Ｎ ４ Ｌｔ ａｒ＋機付で構成される。 攪拌機の
回転数は、Ｎ００２攪拌機の方を犬きくした方かよい。N o , 1 neutralization @ 3, N o , 2 neutralization N 4 Consists of Lt ar + machine. The rotation speed of the stirrer should be higher than that of the N002 stirrer.
混合、中和されたスラリーは、循環タンク５に入り、ポ
ンプ６により濾過機７に送られ、固液分離される。 分
離された濾液は別系列の水処理中和槽８に供給されて、
水酸化第２鉄が懸濁した第２鉄イオン含有水溶液Ｅと混
合、中和したのち、水処理沈降槽９で固液分離される。The mixed and neutralized slurry enters a circulation tank 5, is sent to a filter 7 by a pump 6, and is separated into solid and liquid. The separated filtrate is supplied to a separate water treatment neutralization tank 8,
After being mixed and neutralized with the ferric ion-containing aqueous solution E in which ferric hydroxide is suspended, solid-liquid separation is performed in the water treatment sedimentation tank 9.
濾過機７で分離された濾液と第２鉄イオン含有水溶液Ｅ
の混合割合は１：２が好適である。Filtrate separated by filter 7 and ferric ion-containing aqueous solution E
The preferred mixing ratio is 1:2.
この時、水溶液を分離したスラリーＳ２は廃液Ｍと混合
する水酸化第２鉄を含有するスラリーＳ１としてポンプ
１０により循環して用いることかできる。At this time, the slurry S2 from which the aqueous solution has been separated can be circulated by the pump 10 and used as a slurry S1 containing ferric hydroxide to be mixed with the waste liquid M.
なお、前記第２鉄イオン含有水溶液Ｅは、第２鉄イオン
５０ｍｇ／ｕ以上、水酸化第２鉄５０〜１００ｍｇ７４
２程度のものが好ましい。The ferric ion-containing aqueous solution E contains 50 mg/u or more of ferric ions and 50 to 100 mg of ferric hydroxide.
A value of about 2 is preferable.
〈実施例〉 以下に本発明を実施例に基づき具体的に説明する。<Example> The present invention will be specifically explained below based on Examples.
（実施例１）
亜鉛１６６ｇ／ρ、ニッケル１７．２ｇ／ｆｌを含む亜
鉛めっぎ廃液に、水酸化第２鉄を４ｗｔ％含むスラリー
を７倍量供給して１３６ｒｐｍで混合し、消石灰を加え
てｐＨ１０，１に中和調整し、生成した固形分を分離し
て得られた濾液中の溶解亜鉛は、２． ２ ｍｇ／ｊ
２、ニッケルは０、 １ ｒｎｇ／ＩＩであった。(Example 1) A slurry containing 4 wt% of ferric hydroxide was supplied in 7 times the amount to a galvanizing waste solution containing 166 g/ρ of zinc and 17.2 g/fl of nickel, mixed at 136 rpm, and slaked lime was added. Dissolved zinc in the filtrate obtained by neutralizing and adjusting the pH to 10.1 and separating the generated solid content was determined by 2. 2 mg/j
2. Nickel was 0.1 rng/II.
この液に水酸化第２鉄（０，１ｗｔ％）が懸濁した第２
鉄イオン（５０ｍｇ／Ｊ２）含有水溶液を２倍量供給し
て３００ｒｐｍで混合し、消石灰を加えて中和した。
その時のｐＨは７６であフた。Ferric hydroxide (0.1 wt%) was suspended in this solution.
Twice the amount of an aqueous solution containing iron ions (50 mg/J2) was supplied, mixed at 300 rpm, and neutralized by adding slaked lime.
The pH at that time was 76.
この混合液中の溶存亜鉛濃度は００３
ｍｇ／Ｉｔであった。 また、ニッケルは検出されなか
った。The dissolved zinc concentration in this mixed solution was 0.003 mg/It. Moreover, nickel was not detected.
（実施例２）
亜鉛２０６ｇ／Ｉｌ、ニッケル１５．８ ｇ／ｕを含む
亜鉛めっき廃液に、水酸化第２鉄を４ｗｔ％含むスラリ
ーを１０倍量供給して１３６ｒｐｍで混合し、消石灰を
加えてｐＨ１０，３に中和調整し、生成した固形分を分
離して得られた濾液中の熔解亜鉛は、１ 、 ５ ｒｎ
ｇ／ＩＩ、ニッケルは０、 １ ｍｇ／Ｉｌであった
。(Example 2) A slurry containing 4 wt% of ferric hydroxide was supplied in 10 times the amount to a zinc plating waste solution containing 206 g/Il of zinc and 15.8 g/U of nickel, mixed at 136 rpm, and slaked lime was added. The dissolved zinc in the filtrate obtained by neutralizing and adjusting the pH to 10.3 and separating the generated solid content was 1.5 rn.
g/II, and nickel was 0.1 mg/Il.
この液に水酸化第２鉄（０，１ｗｔ％）か懸澗した第２
鉄イオン（ａｏｍｇ／ｉ）含有水溶液を２倍量供給して
３００ｒｐｍて混合し、消石灰を加えて中和した。 そ
の時のｐＨは７．９であった。Ferric hydroxide (0.1 wt%) or suspended ferric hydroxide is added to this solution.
Twice the amount of an aqueous solution containing iron ions (aomg/i) was supplied, mixed at 300 rpm, and neutralized by adding slaked lime. The pH at that time was 7.9.
この混合液中の溶存亜鉛濃度は０．０４ｍｇ／ ＩＩで
あフた。 また、ニッケルは検出されなかった。The dissolved zinc concentration in this mixture was 0.04 mg/II. Moreover, nickel was not detected.
（比較例１）
亜鉛２０６ｇ／ｊ２．ニッケル１’５．８ｇ＃を含む亜
鉛めっき廃液に、消石灰を加えてｐＨ１０，５に中和調
整し、生成した固形分を分離して得られた濾液中の溶解
亜鉛は、１３．ＩＢ／ＩＩ、ニッケルは１ 、 ２ ｒ
ｎｇ／ＩＩてあった。(Comparative Example 1) Zinc 206g/j2. The dissolved zinc in the filtrate obtained by adding slaked lime to the zinc plating waste solution containing 5.8 g of nickel 1' and neutralizing it to pH 10.5, and separating the generated solids, was as follows: 13. IB/II, nickel is 1, 2 r
ng/II.
〈発明の効果〉
本発明は以上説明したように構成されているので、本発
明によれは、亜鉛めっき廃液を水酸化第２鉄を含むスラ
リーと混合、中和処理することにより、溶解亜鉛濃度を
低減することかでき、かつ、回収副産物を再利用するこ
とかできる。<Effects of the Invention> Since the present invention is configured as described above, according to the present invention, the concentration of dissolved zinc can be reduced by mixing and neutralizing zinc plating waste liquid with a slurry containing ferric hydroxide. It is possible to reduce the amount of waste and to reuse the recovered by-products.
第１図は、本発明の亜鉛めっき廃液の処理方法の一実施
例を示すフロー図である。
符号の説明
１・・・原料タンク、
２・・・ポンプ、
３・・・Ｎｏ、１中和槽（攪拌機付）、４・・・Ｎｏ、
２中和槽（攪拌機付）、５・・・循環タンク、
６・・・ポンプ、
７・・・濾過機、
８・・・水処理中和槽、
９・・・水処理沈降槽、
１０・・・ポンプFIG. 1 is a flow diagram showing one embodiment of the method for treating galvanizing waste liquid of the present invention. Explanation of symbols 1...Raw material tank, 2...Pump, 3...No, 1 Neutralization tank (with stirrer), 4...No,
2 Neutralization tank (with stirrer), 5... Circulation tank, 6... Pump, 7... Filter machine, 8... Water treatment neutralization tank, 9... Water treatment settling tank, 10. ··pump
Claims (4)
水酸化第２鉄を含有するスラリーと混合した後、該混合
スラリーを中和することを特徴とする亜鉛めっき廃液の
処理方法。(1) A method for treating galvanizing waste liquid, which comprises mixing the waste liquid with a slurry containing ferric hydroxide and then neutralizing the mixed slurry when neutralizing the zinc plating waste liquid.
水酸化第２鉄を含有するスラリーと混合した後、該混合
スラリーを中和し、生成した固形分を分離除去して得ら
れる水溶液と、第１鉄イオンを含有する水溶液を酸化し
ｐＨを調整して得られる水酸化第２鉄が懸濁した第２鉄
イオン含有水溶液とを混合した後、該混合液を中和する
ことを特徴とする亜鉛めっき廃液の処理方法。(2) When neutralizing galvanizing waste liquid, the waste liquid is mixed with a slurry containing ferric hydroxide, the mixed slurry is neutralized, and the generated solid content is separated and removed, resulting in an aqueous solution. and a ferric ion-containing aqueous solution in which ferric hydroxide is suspended, which is obtained by oxidizing an aqueous solution containing ferrous ions and adjusting the pH, and then neutralizing the mixed solution. Characteristic treatment method for galvanizing waste liquid.
イオンを含有する水溶液を酸化しｐＨを調整し、該第１
鉄イオンが水酸化第２鉄として析出したスラリーである
請求項１または２に記載の亜鉛めっき廃液の処理方法。(3) The slurry containing ferric hydroxide is prepared by oxidizing an aqueous solution containing ferrous ions and adjusting the pH.
The method for treating galvanizing waste liquid according to claim 1 or 2, wherein the slurry is a slurry in which iron ions are precipitated as ferric hydroxide.
っき廃液を中和処理するに際し、前記混合液を中和して
得られるスラリーを、前記廃液と混合する水酸化第２鉄
を含有するスラリーとして用いることを特徴とする亜鉛
めっき廃液の処理方法。(4) When neutralizing galvanizing waste liquid by the treatment method according to claim 2 or 3, a slurry obtained by neutralizing the mixed liquid contains ferric hydroxide to be mixed with the waste liquid. A method for treating galvanizing waste liquid characterized by using it as a slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20370590A JPH0487685A (en) | 1990-07-31 | 1990-07-31 | Treatment of used galvanizing solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20370590A JPH0487685A (en) | 1990-07-31 | 1990-07-31 | Treatment of used galvanizing solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0487685A true JPH0487685A (en) | 1992-03-19 |
Family
ID=16478492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20370590A Pending JPH0487685A (en) | 1990-07-31 | 1990-07-31 | Treatment of used galvanizing solution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0487685A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002172395A (en) * | 2000-12-05 | 2002-06-18 | Nec Environment Eng Ltd | Method for iron hydroxide flocculation and sedimentation treatment of thick inorganic component- containing wastewater |
| KR100515414B1 (en) * | 2000-09-05 | 2005-09-15 | 주식회사 포스코 | Apparatus for cleaning electrolyte |
| US9408315B2 (en) | 2013-06-07 | 2016-08-02 | Sony Corporation | Electronic apparatus |
| CN111807488A (en) * | 2020-08-05 | 2020-10-23 | 潍坊工商职业学院 | Technical method for preparing ecological environment-friendly composite water treatment agent by large solid waste complexing agent |
-
1990
- 1990-07-31 JP JP20370590A patent/JPH0487685A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100515414B1 (en) * | 2000-09-05 | 2005-09-15 | 주식회사 포스코 | Apparatus for cleaning electrolyte |
| JP2002172395A (en) * | 2000-12-05 | 2002-06-18 | Nec Environment Eng Ltd | Method for iron hydroxide flocculation and sedimentation treatment of thick inorganic component- containing wastewater |
| US9408315B2 (en) | 2013-06-07 | 2016-08-02 | Sony Corporation | Electronic apparatus |
| CN111807488A (en) * | 2020-08-05 | 2020-10-23 | 潍坊工商职业学院 | Technical method for preparing ecological environment-friendly composite water treatment agent by large solid waste complexing agent |
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