DE19733064A1 - Reclaiming chromic-containing systems - Google Patents
Reclaiming chromic-containing systemsInfo
- Publication number
- DE19733064A1 DE19733064A1 DE1997133064 DE19733064A DE19733064A1 DE 19733064 A1 DE19733064 A1 DE 19733064A1 DE 1997133064 DE1997133064 DE 1997133064 DE 19733064 A DE19733064 A DE 19733064A DE 19733064 A1 DE19733064 A1 DE 19733064A1
- Authority
- DE
- Germany
- Prior art keywords
- chamber
- cell
- electrode
- electrodes
- electrolyte
- 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.)
- Withdrawn
Links
Classifications
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- 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
- C25D21/16—Regeneration of process solutions
- C25D21/18—Regeneration of process solutions of electrolytes
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/86—Regeneration of coating baths
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/46—Regeneration of etching compositions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/36—Regeneration of waste pickling liquors
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Zelle zur Regenerierung von chromhaltigen Syste men, wie sie in der Oberflächenbehandlungstechnik verwendet werden. Typische Vertreter sind Chromierungsbäder, Chromatierungsbäder, Beiz- bzw. Ätzlösungen. Diese Bäder reichern in der Regel dreiwertiges Chrom und metallische Verunreinigungen an. Dialyseapparate und Elektrodia lyseapparate konzentrieren in der Regel nur, ohne die Verunreinigungen zu separieren. Eine Reihe von Zweikammerzellen besitzt den Nachteil der Schlammbildung in einem Elektrodenraum. Kom binationen von verschiedenen Kammerzellen sind vereinzelt für die Nickelrückgewinnung vorge schlagen worden. Ein ähnliches Prinzip wird auch bei der Chromsäureregeneration (DE PS 40 32 856) angewandt. In einer früheren Arbeit (Patrick, K. und Dexter, D.: Combining Elektrolysis and Dialysis for Regeneration of Chromic Acid Etching Solution, Journal of Membrane Science 13 (1983) 327-336) wird die paarweise stoffstrommäßige Verschaltung zweier Teilzellen eines einfachen Dialysators und einer kationenaustauschermembrangeteilten Zelle vorgestellt. Der Er findung liegt die Aufgabe zugrunde, ein Verfahren und eine Zelle zur Verfügung zu stellen, die es erlauben, ohne Chemikalieneinsatz und Schlammbildung Chrom in Ionenform zu konzentrieren, regenerieren und Fremdmetalle in reiner Form abzuscheiden.The invention relates to a method and a cell for the regeneration of chromium-containing systems as used in surface treatment technology. Typical representatives are Chromating baths, chromating baths, pickling and etching solutions. These baths enrich in the Usually trivalent chromium and metallic impurities. Dialysis machines and electrodia lysers usually only concentrate without separating the impurities. A row of two-chamber cells has the disadvantage of sludge formation in an electrode space. Com combinations of different chamber cells are occasionally used for nickel recovery been hit. A similar principle is also used for chromic acid regeneration (DE PS 40 32 856) applied. In a previous work (Patrick, K. and Dexter, D .: Combining Elektrolysis and Dialysis for Regeneration of Chromic Acid Etching Solution, Journal of Membrane Science 13 (1983) 327-336), the pair-wise interconnection of two sub-cells becomes one simple dialyzer and a cation exchange membrane-divided cell. The he It is an object of the invention to provide a method and a cell which make it possible allow to concentrate chromium in ion form without the use of chemicals and sludge formation, regenerate and separate foreign metals in pure form.
Die Aufgabe der Erfindung wird - ausgehend vom Oberbegriff des 1. Patentanspruches - gemäß den Merkmalen im gekennzeichneten Teil gelöst. Die Fig. 1 zeigt die Merkmale des Anspruchs 1. Zwischen einer Vorlage (1) und der Mittelkammer (4) einer Dreikammerzelle (2) zirkuliert der zu behandelnde Elektrolyt. Die Mittelkammer (4) wird durch zwei Separatoren (9) und (10) be grenzt. Die Außenkammern (5) und (6) nehmen Elektroden (7) und (8) auf. Im elektrischen Feld erfolgt eine bevorzugte Wanderungen von Kationen (11), die z. B. an der Elektrode (7) abgeschie den werden können, sowie von Anionen (12), die z. B. in der Außenkammer (6) konzentriert werden können. Wurde diese Außenkammer zuvor mit Teilen des zu regenerierenden Elek trolytes gefüllt, ist gleichzeitig eine partielle Chromoxidation mit nachfolgender Badergän zung möglich. Vorzugsweise sollte für diesen Fall der Separator (9) eine Kationenaustau schermembran oder ein Diaphragma und der Separator (10) eine Anionenaustauscher membran sein. Damit sind die Anforderungen einer eleganten Regeneriertechnik erfüllt.The object of the invention is achieved - starting from the preamble of the first claim - according to the features in the marked part. Fig. 1 shows the features of claim 1. Between a template ( 1 ) and the middle chamber ( 4 ) of a three-chamber cell ( 2 ) circulates the electrolyte to be treated. The middle chamber ( 4 ) is bordered by two separators ( 9 ) and ( 10 ). The outer chambers ( 5 ) and ( 6 ) receive electrodes ( 7 ) and ( 8 ). In the electric field there is a preferred migration of cations ( 11 ), the z. B. on the electrode ( 7 ) can be shot, as well as of anions ( 12 ) z. B. can be concentrated in the outer chamber ( 6 ). If this outer chamber was previously filled with parts of the electrolyte to be regenerated, partial chrome oxidation with subsequent bath replenishment is possible at the same time. In this case, the separator ( 9 ) should preferably be a cation exchange membrane or a diaphragm and the separator ( 10 ) should be an anion exchange membrane. This fulfills the requirements of elegant regeneration technology.
Eine andere Ausführungsform ist z. B. gegeben, wenn bei analoger Stoffstromführung durch die Mittelkammer (4), diese von zwei Kationenaustauschermembranen (9) und (10) begrenzt wird, was vor allem im Falle des Vorliegens von Chloridionen sinnvoll ist, da da mit deren Oxidation zum Chlor an der Elektrode (8) verhindert werden kann. Zum La dungsausgleich wird ein gerichteter Kationenstrom (13), z. B. ein Protonenstrom, in die Mittelkammer (4) eintreten. Another embodiment is e.g. B. given if analogous material flow through the middle chamber ( 4 ), this is limited by two cation exchange membranes ( 9 ) and ( 10 ), which is particularly useful in the presence of chloride ions, since with their oxidation to chlorine at the Electrode ( 8 ) can be prevented. To load equalization is a directed cation stream ( 13 ), for. B. a proton stream, enter the middle chamber ( 4 ).
Die Ausführung der Erfindung wird Hilfe eines Beispiele näher erklärt.The implementation of the invention is explained in more detail with the aid of an example.
Eine Lösung mit Konzentrationswerten von 13 g dreiwertigen Chromes pro Liter und 18 g Eisen pro Liter wurde durch die Mittelkammer der PVC-Elektrolysezelle entsprechend Fig. 1 gegeben. Das Volumen der Lösung betrug 10 l. Der Separator auf der Anodenkammerseite war ein Kera mikdiaphragma, der Separator zur Kathodenkammer eine Nafion-Kationenaustauschermembran. Durch die Elektrolysezelle wurde eine Ladungsmenge von 250 Ah/l geleitet. Nach einer Zeit von 10 Stunden betrug die Konzentration sechswertigen Chromes im Mittelkammerelektrolyten 0,5 g/l. Am Anfang hatte diese Konzentration 20 g/l betragen. In der Anodenkammer, in der zu Versuchsbeginn ein zehnfach verdünnter Mittelkammerelektrolyt eingefüllt worden war, betrug die Konzentration sechswertigen Chromes am Ende 80 g/l. Die Eisenkonzentration wurde im Mit telkammerelektrolyten auf 1,3 g/l gesenkt. In der Kathodenkammer diente eine 10%-ige Schwe felsäure als Konzentrierungselektrolyt. Metallisches Chrom konnte partiell an der Kathode abge schieden werden.A solution with concentration values of 13 g trivalent chromium per liter and 18 g iron per liter was passed through the middle chamber of the PVC electrolysis cell according to FIG. 1. The volume of the solution was 10 l. The separator on the anode chamber side was a ceramic diaphragm, the separator to the cathode chamber was a Nafion cation exchange membrane. A charge of 250 Ah / l was passed through the electrolytic cell. After a period of 10 hours, the concentration of hexavalent chromium in the middle chamber electrolyte was 0.5 g / l. At the beginning this concentration was 20 g / l. In the anode chamber, in which a ten-fold diluted middle chamber electrolyte had been filled at the beginning of the experiment, the concentration of hexavalent chromium at the end was 80 g / l. The iron concentration was reduced to 1.3 g / l in the middle chamber electrolyte. In the cathode chamber, a 10% sulfuric acid served as the concentration electrolyte. Metallic chromium could be partially deposited on the cathode.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997133064 DE19733064A1 (en) | 1997-07-31 | 1997-07-31 | Reclaiming chromic-containing systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1997133064 DE19733064A1 (en) | 1997-07-31 | 1997-07-31 | Reclaiming chromic-containing systems |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19733064A1 true DE19733064A1 (en) | 1999-02-04 |
Family
ID=7837536
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1997133064 Withdrawn DE19733064A1 (en) | 1997-07-31 | 1997-07-31 | Reclaiming chromic-containing systems |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19733064A1 (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 |
RU2789159C1 (en) * | 2022-05-23 | 2023-01-30 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Российский химико-технологический университет имени Д.И. Менделеева" (РХТУ им. Д.И. Менделеева) | Method for regeneration of the chromium plating electrolyte |
-
1997
- 1997-07-31 DE DE1997133064 patent/DE19733064A1/en not_active Withdrawn
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 |
RU2789159C1 (en) * | 2022-05-23 | 2023-01-30 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Российский химико-технологический университет имени Д.И. Менделеева" (РХТУ им. Д.И. Менделеева) | Method for regeneration of the chromium plating electrolyte |
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Legal Events
Date | Code | Title | Description |
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8139 | Disposal/non-payment of the annual fee |