EP0331231B1 - Procédé pour régénérer des solutions de décapage contenant du ZrF4 - Google Patents
Procédé pour régénérer des solutions de décapage contenant du ZrF4 Download PDFInfo
- Publication number
- EP0331231B1 EP0331231B1 EP89200416A EP89200416A EP0331231B1 EP 0331231 B1 EP0331231 B1 EP 0331231B1 EP 89200416 A EP89200416 A EP 89200416A EP 89200416 A EP89200416 A EP 89200416A EP 0331231 B1 EP0331231 B1 EP 0331231B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- regenerated
- pickling solution
- compounds
- content
- 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.)
- Expired - Lifetime
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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 for regenerating pickling solutions containing ZrF4 by adding Na compounds, precipitation of NaZrF compounds, separating the NaZrF compounds and supplementing HF, HNO3 and possibly H2O.
- the method according to the invention is based on various insights gained in the investigation of incidents of the previously known method.
- NaZrF5 compounds does not necessarily lead to a poorly filterable gel and that one can control whether the predominantly NaZrF5 or Na2ZrF tries compounds are formed by adjusting the temperature and the Na: Zr molar ratio. With increasing temperature, NaZrFr compounds are predominantly precipitated under the same conditions, while in the lower temperature range almost exclusively NA2ZrF6 compounds fail.
- these two connections are not the only ones that form.
- the Na-rich Compound Na2ZrF6 with a molar ratio of 2 and the low-Na compound NaZrF5 with a molar ratio of 1 form only partial complexes of the system.
- the connection Na7Zr6F31 was demonstrated.
- the various NaZrF compounds are subject to constant conversion or reorientation, which can explain the inertia observed during precipitation or the tendency to oversaturation.
- a salt with the empirical formula Na 1.2 ZrF 5.2 is formed in two stages by the process according to the invention.
- the lower Na content in the regenerated pickling solution also means that the Zr content is much higher than they were previously thought to be optimal.
- the initial Zr content is less important than the dissolving capacity of the regenerated pickling solution, i.e. the difference between the Zr content after regeneration (Zr E ) and the Zr content after exhaustion regeneration (ZR A ).
- the process according to the invention is advantageously carried out with significantly lower Na but with a correspondingly higher Zr level than that provided for example in European Patent 0035804.
- the Zr dissolving capacity i.e. the difference between the values in FIGS. 1 and 2 is shown as a function of the Na content and the pickling temperature. It can be seen that in the preferred range from 0.1 to 0.6 g / l Na dissolving capacities from 4 to 30 g / l can be set, the regenerated pickling solution in any case containing less than 10 g / l Zr. In this way, the disadvantages of the known methods described at the outset can be overcome, i.e. on the one hand prevent uncontrolled precipitations during the pickling cycle and on the other hand work with a Na: Zr ratio that is only approx. 20% above the theoretical minimum of 1, which cannot be achieved for practical reasons.
- the range from 0 to 5 is provided for B, and the specific value for a specific system or a specific procedure can be determined empirically.
- the theoretical curve can be measured by appropriate measurements Fig. 2 can be replaced by one tailored to the specific case.
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)
- Separation Using Semi-Permeable Membranes (AREA)
Claims (24)
de 5 à 60 g/litre de HF
de 150 à 400 g/litre de HNO₃
de 0,06 à 1,0 g/litre de Na et
de 5 à 50 g/litre de Zr,
par addition de composés de Na, précipitation de composés de NaZrF, séparation des composés de NaZrF et réenrichissement en HF, en HNO₃ et, le cas échéant, en H₂O, caractérisé en ce qu'il consiste,
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883805654 DE3805654A1 (de) | 1988-02-24 | 1988-02-24 | Verfahren zum regenerieren von zrf(pfeil abwaerts)4(pfeil abwaerts) enthaltenden beizloesungen |
DE3805654 | 1988-02-24 | ||
DE3826499 | 1988-08-04 | ||
DE19883826499 DE3826499A1 (de) | 1988-08-04 | 1988-08-04 | Verfahren zum regenerieren von zrf(pfeil abwaerts)4(pfeil abwaerts) enthaltenden beizloesungen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0331231A1 EP0331231A1 (fr) | 1989-09-06 |
EP0331231B1 true EP0331231B1 (fr) | 1991-10-16 |
Family
ID=25865125
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89200416A Expired - Lifetime EP0331231B1 (fr) | 1988-02-24 | 1989-02-18 | Procédé pour régénérer des solutions de décapage contenant du ZrF4 |
Country Status (3)
Country | Link |
---|---|
US (1) | US4937054A (fr) |
EP (1) | EP0331231B1 (fr) |
DE (1) | DE58900366D1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2729676B1 (fr) * | 1995-01-24 | 1997-04-11 | Zircotube | Procede et dispositif de regeneration d'une solution usagee de decapage d'elements en alliage de zirconium |
FR2946364B1 (fr) * | 2009-06-05 | 2013-01-04 | Airbus France | Procede de regeneration d'une solution de decapage ou d'usinage chimique de titane |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4105469A (en) * | 1977-02-11 | 1978-08-08 | Teledyne Industries, Inc. | Process for regenerating a pickle acid bath |
DE2828547C2 (de) * | 1978-06-29 | 1982-12-23 | Didier-Werke Ag, 6200 Wiesbaden | Verfahren zur Steuerung oder Regelung der Beizbadzusammensetzung einer Beizanlage |
DE3009265A1 (de) * | 1980-03-11 | 1981-09-24 | Metallgesellschaft Ag, 6000 Frankfurt | Verfahren zum regenerieren von zrf (pfeil abwaerts)4(pfeil abwaerts) enthaltenden beizloesungen |
-
1989
- 1989-02-18 DE DE8989200416T patent/DE58900366D1/de not_active Expired - Lifetime
- 1989-02-18 EP EP89200416A patent/EP0331231B1/fr not_active Expired - Lifetime
- 1989-02-24 US US07/316,052 patent/US4937054A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US4937054A (en) | 1990-06-26 |
DE58900366D1 (de) | 1991-11-21 |
EP0331231A1 (fr) | 1989-09-06 |
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