WO2000026441A1 - Nitratfreies recycling-beizverfahren für edelstähle - Google Patents
Nitratfreies recycling-beizverfahren für edelstähle Download PDFInfo
- Publication number
- WO2000026441A1 WO2000026441A1 PCT/DE1999/003475 DE9903475W WO0026441A1 WO 2000026441 A1 WO2000026441 A1 WO 2000026441A1 DE 9903475 W DE9903475 W DE 9903475W WO 0026441 A1 WO0026441 A1 WO 0026441A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pickling
- pickling solution
- anode
- intermediate chambers
- solution
- Prior art date
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
- nitric acid-free pickling processes are therefore becoming increasingly interesting for pickling stainless steels.
- a method is known in which an iron-III-sulfate-containing nitric acid-free pickling solution is used which also contains free sulfuric acid and hydrofluoric acid as a complexing agent.
- the scale layers are primarily dissolved and blasted off with only a slight attack of the base metal.
- Jap. Patent 74 398/77 proposed a process for pickling stainless steels, in which the redox potential is set in a predetermined range by adding sulfuric acid and hydrogen peroxide as the oxidizing agent in a pickling bath containing iron III sulfate and hydrofluoric acid.
- the concentration of iron ll sulfate must not exceed 200 g / l in order to prevent FeSO 4 7 H 2 0 from crystallizing out in the pickling bath.
- the redox potential, measured against a saturated calomel electrode is primarily set to values higher than 300 mV.
- the pickling solution with iron III salts and hydrofluoric acid is used to adjust the redox potential to +100 to 300 mV by adding potassium permanganate or hydrogen peroxide.
- a pickling solution containing iron III sulfate, sulfuric acid and hydrofluoric acid is used at 30 to 70 ° C., the redox potential being increased by adding chlorine-oxygen acids and their salts, by peroxodisulfuric acid and its salts or permanganate is set higher than 300 mV.
- alkali salts of chlorine oxygen acids and peroxodisulfuric acid as well as permanganic acid there is an accumulation of aica iisalt, e.g. B. of alkali sulfates when using alkaiiperoxodisulfates in the pickling bath.
- aica iisalt e.g. B. of alkali sulfates when using alkaiiperoxodisulfates in the pickling bath.
- the significantly higher costs of these oxidizing agents impair the economy of this process.
- the enrichment of alkali salts also leads to the fact that a portion of the pickling solution has to be constantly renewed to prevent concentration drops, also associated with an additional accumulation of waste water containing heavy metals, which is difficult to dispose of.
- pickling additives such as wetting agents, emulsifiers, brighteners and / or inhibitors in the concentration range from 0.1 to 5 g / l can be added to the pickling solution. These additives serve to improve wettability, better detachment of the scale layers, improve the surface quality that can be achieved and reduce the attack on the base metal.
- the anodically formed chromate serves exclusively as an oxidizing agent for the reoxidation of the pickling bath. If the intended potential range of 300 to 800 mV against Ag / AgCI in the pickling bath is adhered to, the chromium is there again as chromium III salt, so that highly toxic chromate cannot get into the wastewater due to possible drag-out losses. In any case, the portion of the used pickling solution to be deliberately removed via the cathode compartments is reduced and thus the redeemed metals are converted to a lower valency level with the release of part of the used pickling acids.
- the anodes are those with a sufficiently high surge voltage against oxygen, such as. B. from platinum or from noble metals or noble metal oxides / mixed oxides coated valve metals titanium, niobium or tantalum or electrodes coated with lead dioxide or tin dioxide.
- anodes made of smooth platinum are preferably used, since the higher the hydrofluoric acid content, corrosion of the valve metal also occurs.
- Those made of carbon, especially impregnated graphite, stainless steel or titanium, can preferably be used as cathodes.
- pickling acids are depleted by electrochemical transfer into the pickling solution circulating over the anode spaces of the recycling electrolysis cells and optionally additional intermediate chambers. This is not only reoxidized, but also enriched with pickling acids from the partial stream of the pickling solution to be circulated through the cathode compartments. To compensate for remaining losses of pickling acids, it is advantageous to add these to the partial stream of the pickling solution that is passed through the anode compartments before the electrolysis.
- the removal of the excess pickling solution via the cathode compartments is also associated with the advantage that the hydrofluoric acid, which is predominantly bound to the iron III ion, is released upon reduction to the iron II ion and can be depleted by the anion exchange membrane.
- the partial stream to be circulated flows through the cathode compartments first for cathodic reduction and thus for the release of the hydrofluoric acid, and then only through the additional intermediate chambers.
- the electrochemically converted anions also return water to the pickling agent circuit via the anion exchange membranes, the excess pickling solution to be removed via the cathode compartments is concentrated. With suitable process control, it is thus possible to circle out a relatively concentrated metal sulfate solution with only a small amount of free pickling acids and to process it by known processes.
- the pickling acids in the cathode spaces and or intermediate chambers are depleted to such an extent that metal hydroxides are precipitated, which can be separated outside the cell by known methods and processed for reuse.
- a selective precipitation of certain alloy components can also be achieved, depending on which pH value is set at the end of the electrolysis, depending on the electrolysis process and / or by additional addition of alkalis.
- depletion of the pickling acids to such an extent that hydroxide precipitation occurs depletion in most cases from the anion exchange membranes delimiting the cathode spaces is not sufficient. Therefore, intermediate chambers between anode and cathode spaces are advantageous in order to enlarge the anion exchange membrane area.
- Such intermediate chambers are arranged in pairs, the two intermediate chambers belonging to each pair being separated by a cation exchange membrane and being delimited from the adjacent electrode spaces or the next pair of intermediate chambers by anion exchange membranes.
- a cation exchange membrane Separates two intermediate chambers belonging to each pair from the adjacent electrode spaces or the next pair of intermediate chambers by anion exchange membranes.
- four-chamber cells, six-chamber cells and so on are obtained, a four-chamber cell being sufficient in most cases.
- the partial flow of the pickling solution to be circulated first passes through the cathode spaces, then through the intermediate chambers adjoining the anode spaces.
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)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19982260T DE19982260D2 (de) | 1998-11-03 | 1999-11-02 | Nitratfreies Recycling-Beizverfahren für Edelstähle |
AU17705/00A AU1770500A (en) | 1998-11-03 | 1999-11-02 | Nitrate-free recycling pickling method for special steels |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1998150524 DE19850524C2 (de) | 1998-11-03 | 1998-11-03 | Nitratfreies Recycling-Beizverfahren für Edelstähle |
DE19850524.8 | 1998-11-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000026441A1 true WO2000026441A1 (de) | 2000-05-11 |
Family
ID=7886453
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1999/003475 WO2000026441A1 (de) | 1998-11-03 | 1999-11-02 | Nitratfreies recycling-beizverfahren für edelstähle |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU1770500A (de) |
DE (2) | DE19850524C2 (de) |
WO (1) | WO2000026441A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104278281B (zh) * | 2013-07-12 | 2017-04-19 | 中国石油化工股份有限公司 | 一种含复配钝化剂的酸洗液及其制备方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU438729A1 (ru) * | 1970-07-17 | 1975-01-23 | Предприятие П/Я А-7125 | Способ регенерации сернокислых и хлористых травильных растворов железа |
JPS50133125A (de) * | 1974-04-10 | 1975-10-22 | ||
EP0582121A1 (de) * | 1992-08-06 | 1994-02-09 | Itb S.R.L. | Verfahren zum Beizen und Passivieren von rostfreiem Stahl ohne Verwendung von Salpetersäure |
WO1997043463A1 (en) * | 1996-05-09 | 1997-11-20 | Henkel Kommanditgesellschaft Auf Aktien | Steel pickling process in which the oxidation of the ferrous ion formed is carried out electrolytically |
WO1998026111A1 (en) * | 1996-12-09 | 1998-06-18 | Centro Sviluppo Materiali S.P.A. | Method for pickling products in a metal alloy containing iron and in titanium and alloys thereof |
WO1998038353A1 (en) * | 1997-02-25 | 1998-09-03 | Centro Sviluppo Materiali S.P.A. | Method for pickling products of a metal alloy in absence of nitric and for recovering exhausted pickling solutions and apparatus therefore |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
HU169344B (en) * | 1973-11-27 | 1976-11-27 | Jozsef Kerti | Method for electrochemical cycle-processing pickle end-solutions containing sulfuric acid |
JPS549120A (en) * | 1977-06-24 | 1979-01-23 | Tokai Electro Chemical Co | Method of controlling acid cleaning liquid for stainless steel |
DE3206538C2 (de) * | 1982-02-24 | 1984-04-12 | Keramchemie GmbH, 5433 Siershahn | Verfahren zur elektrolytischen Regenerierung von verbrauchter Schwefelsäure-Beizflüssigkeit |
ATE121804T1 (de) * | 1985-01-22 | 1995-05-15 | Ugine Sa | Verfahren zum säuren beizen von stahlen, insbesondere von rostfreien stahlen. |
FR2587369B1 (fr) * | 1985-09-19 | 1993-01-29 | Ugine Gueugnon Sa | Procede de decapage acide de produits en acier inoxydable |
DE4218915A1 (de) * | 1992-06-10 | 1993-12-16 | Heraeus Elektrochemie | Verfahren und Vorrichtung zur Regenerierung einer Metallionen und Schwefelsäure enthaltenden wäßrigen Lösung sowie Verwendung |
DE4326854A1 (de) * | 1993-08-11 | 1995-02-16 | Heraeus Elektrochemie | Verfahren zur Regenerierung einer Metallionen und Schwefelsäure enthaltenden wässrigen Lösung sowie Vorrchtung |
IT1276954B1 (it) * | 1995-10-18 | 1997-11-03 | Novamax Itb S R L | Processo di decapaggio e di passivazione di acciaio inossidabile senza impiego di acido nitrico |
-
1998
- 1998-11-03 DE DE1998150524 patent/DE19850524C2/de not_active Expired - Fee Related
-
1999
- 1999-11-02 DE DE19982260T patent/DE19982260D2/de not_active Expired - Fee Related
- 1999-11-02 WO PCT/DE1999/003475 patent/WO2000026441A1/de active Application Filing
- 1999-11-02 AU AU17705/00A patent/AU1770500A/en not_active Abandoned
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU438729A1 (ru) * | 1970-07-17 | 1975-01-23 | Предприятие П/Я А-7125 | Способ регенерации сернокислых и хлористых травильных растворов железа |
JPS50133125A (de) * | 1974-04-10 | 1975-10-22 | ||
EP0582121A1 (de) * | 1992-08-06 | 1994-02-09 | Itb S.R.L. | Verfahren zum Beizen und Passivieren von rostfreiem Stahl ohne Verwendung von Salpetersäure |
WO1997043463A1 (en) * | 1996-05-09 | 1997-11-20 | Henkel Kommanditgesellschaft Auf Aktien | Steel pickling process in which the oxidation of the ferrous ion formed is carried out electrolytically |
WO1998026111A1 (en) * | 1996-12-09 | 1998-06-18 | Centro Sviluppo Materiali S.P.A. | Method for pickling products in a metal alloy containing iron and in titanium and alloys thereof |
WO1998038353A1 (en) * | 1997-02-25 | 1998-09-03 | Centro Sviluppo Materiali S.P.A. | Method for pickling products of a metal alloy in absence of nitric and for recovering exhausted pickling solutions and apparatus therefore |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Section Ch Week 197526, Derwent World Patents Index; Class J03, AN 1975-43943W, XP002135462 * |
ISARAI R: "Pickling of austenitic stainless steel", CHEMICAL ABSTRACTS + INDEXES,US,AMERICAN CHEMICAL SOCIETY. COLUMBUS, vol. 20, no. 84, 17 May 1976 (1976-05-17), pages 256, XP002024602, ISSN: 0009-2258 * |
Also Published As
Publication number | Publication date |
---|---|
DE19982260D2 (de) | 2001-01-18 |
DE19850524A1 (de) | 2000-05-04 |
AU1770500A (en) | 2000-05-22 |
DE19850524C2 (de) | 2002-04-04 |
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