EP0612359A1 - Verfahren und vorrichtung zur regeneration von altbeizen. - Google Patents
Verfahren und vorrichtung zur regeneration von altbeizen.Info
- Publication number
- EP0612359A1 EP0612359A1 EP92919576A EP92919576A EP0612359A1 EP 0612359 A1 EP0612359 A1 EP 0612359A1 EP 92919576 A EP92919576 A EP 92919576A EP 92919576 A EP92919576 A EP 92919576A EP 0612359 A1 EP0612359 A1 EP 0612359A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- pickling
- sulfuric acid
- cathode compartment
- old
- 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
Classifications
-
- 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
Definitions
- the invention relates to a method and a device for the regeneration of old pickles containing mineral acid, iron and / or zinc salts when pickling workpieces from unalloyed and low-alloy steels by means of mineral acids, preferably hydrochloric acid, sulfuric acid or phosphoric acid.
- the purpose of pickling is to remove the scale or rust layer formed from non-metallic, preferably oxidic, components formed on the surfaces of steel workpieces during the thermoforming or heat treatment in order to obtain a bright metallic surface, which is required if the steel surface should receive a protective coating.
- a protective zinc layer can be applied to the surface of unalloyed and low-alloy steel workpieces by hot-dip galvanizing, the workpieces are preferably pickled in hydrochloric acid or sulfuric acid, which leads to the formation of up to 300 g / 1 FeCl- in hydrochloric acid or up to 200 g / 1 FeSO. comes in the sulfuric acid.
- the bare steel surface is then covered with a thin protective zinc layer from 0.04 to 0.1 mm thick by dipping the workpiece in molten zinc.
- a thin protective zinc layer from 0.04 to 0.1 mm thick by dipping the workpiece in molten zinc.
- the applied zinc protective layer still has pores and cracks from the surface of the coating to the steel surface of the workpiece, it is necessary to pickle this workpiece again in hydrochloric acid or sulfuric acid, with the result that in addition to FeCl or FeSO. still up to 100 g / 1 ZnCl ⁇ in hydrochloric acid or 100 g / 1 ZnSO. in the sulfuric acid.
- the cell voltage is 2 to 12 V, preferably 4 to 8 V, and the current density is 1 kA / m ⁇ , preferably 1 to 5 kA / m.
- the electrolysis process consists of three cells arranged side by side, of which the middle cell forming the cathode compartment is separated from the two outer cells forming the anode compartments by a cation exchange membrane. Old stain containing iron and / or zinc salts based on
- Form are deposited.
- the charge-related migration of the anions to the anodes is caused by the
- Anolyte is preferably used with a sulfuric acid
- Acid content of up to 5% which flows through the anode spaces in the circuit.
- the metals are preferably deposited dendritically.
- the dendrites are continuously stripped from the cathodes by an automatically operating comb device, fall to the bottom of the cathode space and are discharged from there.
- Anode compartment (3) is through
- the dendritically deposited metals iron and zinc are removed from the bottom of the cathode compartment (5).
- the anolyte which consists of sulfuric acid, is circulated (14) by means of the pump (13).
- 2 cell voltage is 6 V and the current density is 1 kA / m. 2nd embodiment
- the regenerated pickling solution discharged from the cathode compartment (5) via the line (12) of the pickling system (1) has the following composition:
- the advantages achieved with the invention can be seen in particular in the fact that the metals iron and zinc can be deposited electrolytically. This enables them to be thermally processed and thus returned to the economic cycle.
- the hydrochloric acid generated electrolytically can be fed directly to the pickling plant.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Electrolytic Production Of Metals (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4131793A DE4131793A1 (de) | 1991-09-24 | 1991-09-24 | Verfahren und vorrichtung zur regeneration von altbeizen |
DE4131793 | 1991-09-24 | ||
PCT/DE1992/000808 WO1993006262A1 (de) | 1991-09-24 | 1992-09-19 | Verfahren und vorrichtung zur regeneration von altbeizen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0612359A1 true EP0612359A1 (de) | 1994-08-31 |
EP0612359B1 EP0612359B1 (de) | 1995-09-13 |
Family
ID=6441386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92919576A Expired - Lifetime EP0612359B1 (de) | 1991-09-24 | 1992-09-19 | Verfahren zur regeneration von altbeizen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0612359B1 (de) |
AT (1) | ATE127861T1 (de) |
AU (1) | AU2570592A (de) |
DE (2) | DE4131793A1 (de) |
WO (1) | WO1993006262A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4326854A1 (de) * | 1993-08-11 | 1995-02-16 | Heraeus Elektrochemie | Verfahren zur Regenerierung einer Metallionen und Schwefelsäure enthaltenden wässrigen Lösung sowie Vorrchtung |
AUPM424894A0 (en) * | 1994-03-04 | 1994-03-31 | Spunboa Pty Limited | Treatment of electrolyte solutions |
AT400928B (de) * | 1994-11-09 | 1996-04-25 | Avr Abfallverwertungs Und Rohs | Verfahren zur aufarbeitung von zink/eisenhaltigen altsäuren |
DE19829592C1 (de) * | 1998-07-02 | 1999-12-09 | Umweltanalytisches Zentrum Gro | Verfahren zur Aufbereitung metallhaltiger Mineralsäuren |
DE19850525A1 (de) * | 1998-11-03 | 2000-05-04 | Eilenburger Elektrolyse & Umwelttechnik Gmbh | Verfahren zum elektrochemischen Regenerieren von Schwefelsäure-Eisen-III-sulfat-Beizlösungen für Edelstähle |
DE102015208690A1 (de) | 2015-05-11 | 2016-11-17 | Technische Universität Bergakademie Freiberg | Elektrodialytische Herstellung von Phosphorsäure und Vorrichtung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1155610B (de) * | 1961-05-18 | 1963-10-10 | Ionics | Verfahren und Zelle zur elektrolytischen Abscheidung von Metallen, insbesondere von Eisen |
US3072545A (en) * | 1961-11-20 | 1963-01-08 | Ionics | Electroplating of metals |
DE1571728A1 (de) * | 1966-10-01 | 1970-12-17 | Duerkes Dipl Chem Dr Karl | Verfahren zur Regenerierung und/oder Aufbereitung sowie Reinigung von Beizbaedern,Wasch- und Spuelfluessigkeiten,galvanischen Baedern und Abwaessern |
US3801481A (en) * | 1972-04-21 | 1974-04-02 | Dean D | Method for purifying the liquor of a galvanizing process plant after contamination |
US4149946A (en) * | 1978-03-21 | 1979-04-17 | Davis Walker Corporation | Recovery of spent pickle liquor and iron metal |
US4149951A (en) * | 1978-05-22 | 1979-04-17 | Eddleman William L | Frame filter press and apparatus |
DE3906791A1 (de) * | 1989-03-03 | 1990-09-06 | Metallgesellschaft Ag | Verfahren zur aufbereitung von metallhaltigen, salpetersauren, flusssaeure enthaltenden abfallbeizen |
-
1991
- 1991-09-24 DE DE4131793A patent/DE4131793A1/de not_active Withdrawn
-
1992
- 1992-09-19 EP EP92919576A patent/EP0612359B1/de not_active Expired - Lifetime
- 1992-09-19 WO PCT/DE1992/000808 patent/WO1993006262A1/de active IP Right Grant
- 1992-09-19 AU AU25705/92A patent/AU2570592A/en not_active Abandoned
- 1992-09-19 AT AT92919576T patent/ATE127861T1/de not_active IP Right Cessation
- 1992-09-19 DE DE59203700T patent/DE59203700D1/de not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9306262A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU2570592A (en) | 1993-04-27 |
EP0612359B1 (de) | 1995-09-13 |
WO1993006262A1 (de) | 1993-04-01 |
DE4131793A1 (de) | 1993-03-25 |
DE59203700D1 (de) | 1995-10-19 |
ATE127861T1 (de) | 1995-09-15 |
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