JPH0251000A - Treatment of waste zinc-chromium alloy electroplating solution - Google Patents
Treatment of waste zinc-chromium alloy electroplating solutionInfo
- Publication number
- JPH0251000A JPH0251000A JP19798488A JP19798488A JPH0251000A JP H0251000 A JPH0251000 A JP H0251000A JP 19798488 A JP19798488 A JP 19798488A JP 19798488 A JP19798488 A JP 19798488A JP H0251000 A JPH0251000 A JP H0251000A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- soln
- alloy electroplating
- zinc
- waste
- 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
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−クロム合金メッキ廃液の処理方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for treating zinc-chromium alloy plating waste liquid.
（従来技術とその課題）
亜鉛−クロム合金電気メッキ鋼板の製造について、例え
ば特開昭６２−５４０９９号等により開示されている。(Prior Art and its Problems) The production of zinc-chromium alloy electroplated steel sheets is disclosed in, for example, Japanese Patent Laid-Open No. 62-54099.
か）る電気メッキにおいては、メッキ廃液にクロムが含
有されており、確実な無害化処理が必要となる。In electroplating, the plating waste liquid contains chromium, which requires reliable detoxification treatment.
（発明の目的）
本発明は、このようなメッキ廃液を確実に無害化処理す
る優れた方法を提供するものである。(Objective of the Invention) The present invention provides an excellent method for reliably rendering such plating waste liquid harmless.
（発明が解決しようとする課題）
本発明の特徴とするところは、亜鉛−クロム合金電気メ
ッキ廃液を中和処理するとともにスラッジ化し、該スラ
ッジを脱水処理後、脱硫処理を施し、次いで還元処理す
ることを特徴とする、亜鉛クロム合金電気メッキ廃°液
の処理方法。(Problems to be Solved by the Invention) The present invention is characterized in that zinc-chromium alloy electroplating waste liquid is neutralized and turned into sludge, and the sludge is dehydrated, desulfurized, and then reduced. A method for treating zinc chromium alloy electroplating waste liquid, characterized by:
及び上記のごとく、亜鉛−クロム−鉄の電気メッキ廃液
を処理する方法に関するものである。and, as mentioned above, a method for treating zinc-chromium-iron electroplating waste liquid.
本発明においては、亜鉛−クロム合金電気メッキ廃液（
硫酸塩のかたちで混在するＺｎ、Ｃｒ等）を中和するた
め先ず、Ｃｒ’”をＦｅ”（硫酸塩、塩酸塩）でＣｒ３
＋に還元後、メッキ廃液に水酸化ナトリウム（ＮａＯＨ
）、重曹（ＮａＨＣＯ３）等を添加することにより、中
和するとともにスラッジ化させる。In the present invention, zinc-chromium alloy electroplating waste liquid (
In order to neutralize Zn, Cr, etc., which are present in the form of sulfates, Cr'" is first converted to Cr3 with Fe" (sulfate, hydrochloride).
After reducing to +, add sodium hydroxide (NaOH) to the plating waste solution.
), baking soda (NaHCO3), etc. to neutralize it and turn it into sludge.
次いで、このスラッジを脱水処理矛する、例えばプレス
遠心分離等により、約５０％以下の水分量に脱水処理す
ることが好ましい。即ち、次工程の脱硫処理において短
時間で処理するためである。Next, this sludge is preferably dehydrated to a water content of about 50% or less by, for example, press centrifugation. That is, the desulfurization treatment in the next step can be carried out in a short time.
このようにして脱水処理したスラッジはＺｎ（ＯＨ）２
゜Ｃｒ（ＯＨ）３． Ｆｅ（ＯＨ２）の組成をなしてい
る。The sludge dehydrated in this way is Zn(OH)2
°Cr(OH)3. It has a composition of Fe(OH2).
これを脱硫処理するものであるが、スラッジ中の硫黄源
は、メッキ液中のＨ２ＳＯ，が残るためであり、脱硫後
のスラッジ中の硫黄は、約２０ｐｐｍ以下にしないと、
後工程で回収する金属中に多量に残存する。特にＺｎＳ
になり易く、商品価値を低下させるので好ましくな
い。This is desulfurized, but the sulfur source in the sludge is the remaining H2SO in the plating solution, and the sulfur in the sludge after desulfurization must be reduced to about 20 ppm or less.
A large amount remains in the metal recovered in the subsequent process. Especially ZnS
This is undesirable because it tends to cause damage and lowers the product value.
しかして脱硫処理としては、大気雰囲気で、７００〜１
２００℃で２〜４時間処理することにより、Ｈ２Ｓｏ４
→Ｈ２０十Ｓ○３として熱分解し、脱硫する。一方スラ
ッジ中のＺｎ（ＯＨ）２→Ｚｎ○、Ｃｒ（ＯＨ）、−＋
Ｃｒ２Ｏ３，Ｆｅ（ＯＨ）２−＋ＦｅＯにそれぞれ脱水
される。However, as a desulfurization treatment, 700 to 1
By treating at 200℃ for 2-4 hours, H2So4
→ It is thermally decomposed as H20+S○3 and desulfurized. On the other hand, Zn(OH)2 in sludge → Zn○, Cr(OH), −+
They are dehydrated to Cr2O3 and Fe(OH)2-+FeO, respectively.
このようにして脱硫処理したスラッジを還元処理し、金
属として回収するものであるが、その処理方法としては
、例えば、多管型外熱式キルンで効率よく還元すること
ができる。The sludge desulfurized in this way is subjected to a reduction treatment and recovered as metal, and as a treatment method, for example, the reduction can be efficiently performed using a multi-tube external heating kiln.
即ち、キルンの管内にスラッジを通過させ、管内を還元
雰囲気にするためスラッジ中に例えば炭素として、コー
クス粉等を９〜１５％又は、ｃＯガス、Ｈ２ガス等混入
し、かつ、管内に窒素ガスを導入しつつ、管外で加熱す
る、例えば、１１００℃〜１３００℃で２０〜４０分で
スラッジ中の酸化金属が２ＺｎＯ＋Ｃ−＋２Ｚｎ＋ＣＯ
２としてＺｎを還元回収し、金属亜鉛として再利用し、
残りのスラッジはＣｒ金属として再利用する。That is, sludge is passed through the tubes of the kiln, and in order to create a reducing atmosphere inside the tubes, 9 to 15% of carbon, such as coke powder, or CO gas, H2 gas, etc. is mixed into the sludge, and nitrogen gas is added to the tubes. For example, by heating outside the tube at 1100°C to 1300°C for 20 to 40 minutes, the metal oxide in the sludge becomes 2ZnO+C-+2Zn+CO
2, Zn is reduced and recovered and reused as metal zinc,
The remaining sludge is reused as Cr metal.
しかして、メッキ鋼板として、亜鉛−クロム合金電気メ
ッキを施し、例えば、その上層に亜鉛−鉄合金電気メッ
キを施す場合は、亜鉛−鉄合金電気メッキ廃液が発生す
るが、このような場合には、上記亜鉛−クロムメッキ廃
液とともに前記のごとく、還元処理することもできる。However, when a galvanized steel sheet is coated with zinc-chromium alloy electroplating and, for example, zinc-iron alloy electroplating is applied on the top layer, zinc-iron alloy electroplating waste liquid is generated. , it can also be subjected to reduction treatment as described above together with the zinc-chromium plating waste solution.
（実施例） 次に本発明の実施例を上げる。(Example) Next, examples of the present invention will be described.
亜鉛−クロム合金電気メッキ廃液（組成ＨＣｒ”０．０
２ｇ／Ｑ、Ｃｒ”０．７ｇ／ｕ、Ｚｎ”０．５ｇ／Ｒ）
に中和処理として水酸化ナトリウムを添加して中和し、
スラッジ化した。Zinc-chromium alloy electroplating waste liquid (composition HCr”0.0
2g/Q, Cr”0.7g/u, Zn”0.5g/R)
As a neutralization treatment, sodium hydroxide is added to neutralize the
It turned into sludge.
次いでスラッジをプレスして脱水処理し、水分５０％、
８分３％の大気雰囲気中で９５０Ｔｘ ３時間脱硫処理
し、Ｓ ： １５ｐｐｍにしたスラッジにコークス粉を
１１％添加したスラッジを窒素ガス雰囲気下で、１３０
０℃ＸａＱ分で還元処理した。The sludge is then pressed and dehydrated to reduce the water content to 50%.
A sludge obtained by adding 11% of coke powder to the sludge which was desulfurized at 950Tx for 3 hours in a 3% air atmosphere for 8 minutes and made S: 15ppm was desulfurized at 130Tx in a nitrogen gas atmosphere.
Reduction treatment was carried out at 0°C for XaQ minutes.
還元処理時の排ガス中からＺｎ金属を回収し、スラッジ
からＣｒ金属６５％を回収した。Zn metal was recovered from the exhaust gas during the reduction treatment, and 65% of Cr metal was recovered from the sludge.
（発明の効果）
本発明によれば、亜鉛−クロム合金電気メッキ廃液から
亜鉛、クロムを金属として回収するため、メッキ廃液の
廃棄による不都合は確実に解決できる。(Effects of the Invention) According to the present invention, since zinc and chromium are recovered as metals from the zinc-chromium alloy electroplating waste solution, the inconvenience caused by the disposal of the plating waste solution can be reliably solved.
又亜鉛、クロムを金属として回収するため省資源になる
等工業的に優れた効果が得られる。Furthermore, since zinc and chromium are recovered as metals, excellent industrial effects such as resource saving can be obtained.
Claims (1)
、脱硫処理を施し、次いで還元処理することを特徴とす
る、亜鉛−クロム合金電気メッキ廃液の処理方法。[Claims] Zinc-chromium alloy electroplating, characterized in that zinc-chromium alloy electroplating waste liquid is neutralized and turned into sludge, the sludge is dehydrated, desulfurized, and then reduced. How to treat waste liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19798488A JPH0251000A (en) | 1988-08-10 | 1988-08-10 | Treatment of waste zinc-chromium alloy electroplating solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19798488A JPH0251000A (en) | 1988-08-10 | 1988-08-10 | Treatment of waste zinc-chromium alloy electroplating solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0251000A true JPH0251000A (en) | 1990-02-20 |
Family
ID=16383577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19798488A Pending JPH0251000A (en) | 1988-08-10 | 1988-08-10 | Treatment of waste zinc-chromium alloy electroplating solution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0251000A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000005438A1 (en) * | 1998-07-21 | 2000-02-03 | Fernz Timber Protection Limited | Electrochemical conversion of transition metal cations to anions at a higher oxidation state |
| KR100515414B1 (en) * | 2000-09-05 | 2005-09-15 | 주식회사 포스코 | Apparatus for cleaning electrolyte |
-
1988
- 1988-08-10 JP JP19798488A patent/JPH0251000A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000005438A1 (en) * | 1998-07-21 | 2000-02-03 | Fernz Timber Protection Limited | Electrochemical conversion of transition metal cations to anions at a higher oxidation state |
| KR100515414B1 (en) * | 2000-09-05 | 2005-09-15 | 주식회사 포스코 | Apparatus for cleaning electrolyte |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| ATE207453T1 (en) | METHOD FOR TREATING WATER CONTAINING HEAVY METALS | |
| CN102115270A (en) | Method for processing waste acid generated in process of preparing acid from metal smelting fume | |
| CN114835287B (en) | Method for circularly purifying metallurgical arsenic-containing acidic waste liquid and recycling sulfur | |
| CN110451680A (en) | A kind of processing method of nonferrous smelting waste acid | |
| GB1573855A (en) | Treatment of sulphur-containing solutions | |
| CN109867382B (en) | Resource recovery method of metal ions in pickling waste liquid, product prepared by resource recovery method and application of product | |
| CN102690956A (en) | Method for green extraction of chromium and nickel from stainless steel pickled sludge | |
| CN105399182B (en) | A kind of method for efficiently removing heavy metal in waste acid | |
| CN110983057A (en) | Soot treatment method capable of realizing UPOPs synthesis retardation and low-temperature decomposition | |
| JPH0251000A (en) | Treatment of waste zinc-chromium alloy electroplating solution | |
| JP3945216B2 (en) | Waste acid gypsum manufacturing method | |
| CN110102009A (en) | A kind of method of catalysis oxidation rhodanide | |
| US3950492A (en) | Process for removal of ammonia, hydrogen sulfide and hydrogen cyanide from gases containing these substances | |
| CN109097579B (en) | Supercritical water treatment method for arsenic sulfide slag | |
| US5968229A (en) | Purification of metal containing solutions | |
| JPS63267494A (en) | Treatment method for waste liquid containing hexavalent chromium | |
| GB2283485A (en) | Treatment of sludge | |
| CN115231676A (en) | Method for removing arsenic from arsenic-containing wastewater by using polysulfides | |
| JPS5892492A (en) | Treatment of cyanide waste liquid contg. cuprocyanide ion | |
| JP2000167569A (en) | Copper-containing acidic wastewater treatment method and treatment equipment | |
| JPH09150164A (en) | Treatment of selenium-containing waste water | |
| ZA202403958B (en) | Method for preparing h2s by decomposing acid waste neutralization slag | |
| JPS6135133B2 (en) | ||
| JPS60183087A (en) | Method for treating mercury-containing wastewater | |
| JPS54114416A (en) | Treatment of desulfurized slag |