AT404031B - METHOD FOR REGENERATING HCL MISCOLID ACIDS WITH ADMINISTRATION OF ZINC IN A SPRAYING EYE PROCESS - Google Patents
METHOD FOR REGENERATING HCL MISCOLID ACIDS WITH ADMINISTRATION OF ZINC IN A SPRAYING EYE PROCESS Download PDFInfo
- Publication number
- AT404031B AT404031B AT0194594A AT194594A AT404031B AT 404031 B AT404031 B AT 404031B AT 0194594 A AT0194594 A AT 0194594A AT 194594 A AT194594 A AT 194594A AT 404031 B AT404031 B AT 404031B
- Authority
- AT
- Austria
- Prior art keywords
- pickling
- zinc
- oxide
- magnesium
- acid
- Prior art date
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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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/07—Purification ; Separation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Compounds Of Iron (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Processing Of Solid Wastes (AREA)
Description
AT 404 031 BAT 404 031 B
Oie Erfindung betrifft ein Verfahren zur Regeneration von HCI-Beizsäuren mit Beimengungen von Zink in einem Sprühröstprozeß.The invention relates to a process for the regeneration of HCI pickling acids with admixtures of zinc in a spray roasting process.
Die Regeneration von Beizsäuren mit Zinkkonzentrationen größer 10 g/l stellt seit vielen Jahren ein ungelöstes Problem dar. Bisher wurde daher versucht, den Zn-Gehait in der Abbeize mit 10 g/l zu begrenzen, um solche Beizsäuren einigermaßen störungsfrei regenerieren zu können. Oer Nachteil ist, daß die an das Zink gebundene Salzsäure nicht zurückgewonnen werden kann und das entstehende Eisenoxid auf Grund seines Zinkchloridgehaltes nicht ohne weitere Behandlung deponiert werden kann. Dies gilt ebenso für niedrige Zinkchloridgehalte. Beizsäuren mit höheren Zinkgehalten müssen neutralisiert werden, was hohe Kosten sowie große Probleme bei der Schiammdeponie und dem Abwasser mit sich bringt.The regeneration of pickling acids with zinc concentrations greater than 10 g / l has been an unsolved problem for many years. So far, attempts have been made to limit the Zn content in the pickling agent to 10 g / l in order to be able to regenerate such pickling acids to some extent without problems. The disadvantage is that the hydrochloric acid bound to the zinc cannot be recovered and the resulting iron oxide cannot be deposited without further treatment due to its zinc chloride content. This also applies to low zinc chloride levels. Pickling acids with higher zinc contents have to be neutralized, which entails high costs as well as major problems with the sludge landfill and the wastewater.
Die Ursache für die Schwierigkeit der Regeneration von hochzinkhältigen Beizsäuren liegt in der Flüchtigkeit des Zinkchlorids. Beim Abrösten von Eisenchlorid liegt die Temperatur in der Brennerzone über dem Siedepunkt des Zinkchlorids. Weiters ist Zinkchlorid stark hygroskopisch, so daß es bei Abkühlung in den Leitungen, im Zyklon und auch im Reaktor zu Verstopfungen und Ablagerungen kommt, die erhebliche Betriebsstörungen verursachen.The reason for the difficulty in regenerating high-zinc pickling acids is the volatility of zinc chloride. When iron chloride is roasted, the temperature in the burner zone is above the boiling point of zinc chloride. In addition, zinc chloride is very hygroscopic, so that when the pipes, cyclone and reactor cool down, blockages and deposits occur which cause considerable malfunctions.
Die Erfindung hat das Ziel, HCI-Abbeizen mit einer Beimengung an Zink problemlos zu regenerieren. Dazu wird erfindungsgemäß vorgeschlagen, daß der Abbeize eine Menge an Magnesiumionen beigege-ben wird. Durch die Beigabe von Magnesiumionen kann das Zink gebunden werden, wodurch eine problemlose Deponie möglich wird.The aim of the invention is to regenerate HCI pickling with an admixture of zinc without problems. For this purpose, it is proposed according to the invention that a quantity of magnesium ions is added to the pickling agent. The zinc can be bound by the addition of magnesium ions, which makes a problem-free landfill possible.
Eine Weiterbildung der Erfindung ist dadurch gekennzeichnet, daß eine Menge an Magnesiumionen beigegeben wird, die mindestens der Menge an Zink äquivalent ist. Dadurch können auch Abbeizen mit einem Zinkgehalt von wesentlich über 10 g/l problemlos regeneriert werden, ohne Gefahr von Verstopfungen und Ablagerungen.A further development of the invention is characterized in that an amount of magnesium ions is added which is at least equivalent to the amount of zinc. This also means that pickling with a zinc content of significantly more than 10 g / l can be regenerated without any problems, without the risk of blockages and deposits.
Die Beigabe der Magnesiumionen kann in Form von Magnesiumchlorid oder auch in Form von magnesitischen Abfällen wie z.B. Flugstäuben oder Flotationsrückständen erfolgen.The magnesium ions can be added in the form of magnesium chloride or in the form of magnesitic waste such as Fly dusts or flotation residues occur.
Durch die vorteilhafte Umwandlung des Eisenoxids zu einem ZnO.MgO.Fe203-Spineli läßt sich die Abbeize ohne weitere Zusatzaggregate in jeder Salzsäureregenerationsanlage problemlos verarbeiten.Due to the advantageous conversion of the iron oxide to a ZnO.MgO.Fe203 spineli, the pickling can be processed in any hydrochloric acid regeneration plant without any additional units.
Durch die Bindung des Zinks kommt es zu keinerlei Verstopfungen und Ablagerungen von Zinkchlorid. Die regenerierte Salzsäure ist weitestgehend Zn-frei.By binding the zinc, there is no blockage or deposits of zinc chloride. The regenerated hydrochloric acid is largely Zn-free.
Bei den bisherigen Verfahren fand folgende Reaktion statt: (1) ZnCI2 + 2 FeCI2 + 2 H20 + 1/2 02 —> Fe203 + ZnCI2 + 4 HClIn the previous processes, the following reaction took place: (1) ZnCI2 + 2 FeCI2 + 2 H20 + 1/2 02 - > Fe203 + ZnCI2 + 4 HCl
Bei dieser Reaktion kann das ZnCI2 nicht gebunden werden und durch seine leichte Flüchtigkeit verursacht es Ablagerungen an kühleren Rohrleitungsteilen und unerwünschte Verstopfungen.In this reaction, the ZnCl2 cannot be bound and due to its slight volatility, it causes deposits on cooler pipeline parts and unwanted blockages.
Das erfindungsgemäße Verfahren arbeitet z.B. nach folgender Formel: (2) MgCI2 + ZnCI2 + 2 FeCI2 + 4 H20 + 1/2 02 —> MgZnFe205 + 8 HCl Überschüssiges Eisenchlorid wird im Reaktor nach folgender Formel umgewandelt: (3) FeCI2 + 2 H20 + 1/2 02 ~> Fe203 + 4 HClThe method according to the invention works e.g. according to the following formula: (2) MgCI2 + ZnCI2 + 2 FeCI2 + 4 H20 + 1/2 02 - > MgZnFe205 + 8 HCl Excess iron chloride is converted in the reactor according to the following formula: (3) FeCI2 + 2 H20 + 1/2 02 ~ > Fe203 + 4 HCl
Durch die Zugabe von Magnesiumionen, wie z.B. in Form von Magnesiumchlorid in Formel (2), kann das Zink gebunden und die Säure nahezu vollständig regeneriert werden.By adding magnesium ions, e.g. in the form of magnesium chloride in formula (2), the zinc can be bound and the acid can be regenerated almost completely.
Die Erfindung wird nun anhand von Ausführungsbeispielen sowie der Zeichnung beispielhaft erläutert, wobei die Figur ein Schema einer Anlage zeigt, bei der die Erfindung angewandt werden kann.The invention will now be explained by way of example using exemplary embodiments and the drawing, the figure showing a diagram of a system in which the invention can be used.
Ausführungsbeispiel 1: 80 Liter einer Lösung der Zusammensetzung 233,4 g/l FeCI2 31,8 g/l ZnCI2 23.1 g/l MgCI2 173,0 g/l gebundene und freie HCl wurden einem Sprühröstprozeß zugeführt. Dies entspricht 15.2 g/l Zink-ionen und einem Molverhältnis Mg : Zn = 1 :1Embodiment 1: 80 liters of a solution of the composition 233.4 g / l FeCl 2 31.8 g / l ZnCl 2 23.1 g / l MgCl 2 173.0 g / l bound and free HCl were fed to a spray roasting process. This corresponds to 15.2 g / l zinc ions and a molar ratio Mg: Zn = 1: 1
Als Reaktionsprodukte fielen 14,0 kg Sprühröstoxid der Zusammensetzung 84,75 % Fe203 214.0 kg of spray roasting oxide with the composition 84.75% Fe203 2 fell as reaction products
AT 404 031 BAT 404 031 B
9.61 % ZnO9.61% ZnO
5,40 % MgO 0,25 % Restchlorid sowie 73 Liter regenerierte Salzsäure der Zusammensetzung 2,04 g/i FeCI3 3,55 g/l ZnCI2 1,76 g/l MgCI2 190 g/l gebundene und freie HCl an.5.40% MgO 0.25% residual chloride and 73 liters of regenerated hydrochloric acid of the composition 2.04 g / i FeCl3 3.55 g / l ZnCl2 1.76 g / l MgCl2 190 g / l bound and free HCl.
Ausführungsbeispiel 2: 80 Liter einer Lösung der Zusammensetzung 231.5 g/l FeCI2 31.8 g/l ZnCI2 32.5 g/l MgCI2 178.0 g/l gebundene und freie HCl wurden einem Sprühröstprozeß zugeführt. Dies entspricht 15.2 g/l Zink-ionen und einem Molverhältnis Mg : Zn = 1,5 : 1Embodiment 2: 80 liters of a solution of the composition 231.5 g / l FeCl 2 31.8 g / l ZnCl 2 32.5 g / l MgCl 2 178.0 g / l bound and free HCl were fed to a spray roasting process. This corresponds to 15.2 g / l zinc ions and a molar ratio Mg: Zn = 1.5: 1
Als Reaktionsprodukte fielen 14,1 kg Sprühröstoxid der Zusammensetzung 82,60 % Fe20314.1 kg of spray rust oxide with the composition 82.60% Fe203 fell as reaction products
9,48 % ZnO9.48% ZnO
7,69 % MgO 0,23 % Restchlorid sowie 72 Liter regenerierte Salzsäure der Zusammensetzung 2.62 g/l FeCI3 2,93 g/l ZnCI2 2,51 g/l MgCI2 196.8 g/l gebundene und freie HCl an.7.69% MgO 0.23% residual chloride and 72 liters of regenerated hydrochloric acid of the composition 2.62 g / l FeCl3 2.93 g / l ZnCl2 2.51 g / l MgCl2 196.8 g / l bound and free HCl.
Ausführungsbeispiel 3: 80 Liter einer Lösung der Zusammensetzung 220.2 g/l FeCI2 58.5 g/l ZnCI2 43,9 g/l MgCI2 208.0 g/l gebundene und freie HCl wurden einem Sprühröstprozeß zugeführt. Dies entspricht 28.0 g/l Zink-ionen und einem Molverhältnis Mg : Zn = 1 : 1Example 3: 80 liters of a solution of the composition 220.2 g / l FeCl 2 58.5 g / l ZnCl 2 43.9 g / l MgCl 2 208.0 g / l bound and free HCl were fed to a spray roasting process. This corresponds to 28.0 g / l zinc ions and a molar ratio Mg: Zn = 1: 1
Als Reaktionsprodukte fielen 15,2 kg Sprühröstoxid der Zusammensetzung 72,91 % Fe20315.2 kg of spray roasting oxide with the composition 72.91% Fe203 fell as reaction products
17,16% ZnO17.16% ZnO
9.61 % MgO 0,31 % Restchlorid sowie 84 Liter regenerierte Salzsäure der Zusammensetzung 2.62 g/ I FeCI3 3,32 g/l ZnCI2 3,53 g/l MgCI2 197 g/l gebundene und freie HCl an.9.61% MgO 0.31% residual chloride and 84 liters of regenerated hydrochloric acid of the composition 2.62 g / l FeCl3 3.32 g / l ZnCl2 3.53 g / l MgCl2 197 g / l bound and free HCl.
Ausführungsbeispiel 4: 80 Liter einer Lösung der Zusammensetzung 226.8 g/l FeCI2 9.6 g/l ZnCI2 6.7 g/l MgCI2 171.0 g/l gebundene und freie HCl wurden einem Sprühröstprozeß zugeführt. 3Example 4: 80 liters of a solution of the composition 226.8 g / l FeCl 2 9.6 g / l ZnCl 2 6.7 g / l MgCl 2 171.0 g / l bound and free HCl were fed to a spray roasting process. 3rd
Claims (6)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0194594A AT404031B (en) | 1994-10-14 | 1994-10-14 | METHOD FOR REGENERATING HCL MISCOLID ACIDS WITH ADMINISTRATION OF ZINC IN A SPRAYING EYE PROCESS |
DE19534545A DE19534545C2 (en) | 1994-10-14 | 1995-09-18 | Process for the regeneration of HCI pickling acids with the addition of zinc in a spray roasting process |
TW084110061A TW297017B (en) | 1994-10-14 | 1995-09-26 | |
BE9500817A BE1009555A3 (en) | 1994-10-14 | 1995-10-03 | Process for the regeneration of beit hcl acid with additions of zinc in a spray roost process. |
KR1019950034098A KR960013983A (en) | 1994-10-14 | 1995-10-05 | Hydrochloric Acid (HCl) Pickling Acid Regeneration Process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0194594A AT404031B (en) | 1994-10-14 | 1994-10-14 | METHOD FOR REGENERATING HCL MISCOLID ACIDS WITH ADMINISTRATION OF ZINC IN A SPRAYING EYE PROCESS |
Publications (2)
Publication Number | Publication Date |
---|---|
ATA194594A ATA194594A (en) | 1997-12-15 |
AT404031B true AT404031B (en) | 1998-07-27 |
Family
ID=3524436
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT0194594A AT404031B (en) | 1994-10-14 | 1994-10-14 | METHOD FOR REGENERATING HCL MISCOLID ACIDS WITH ADMINISTRATION OF ZINC IN A SPRAYING EYE PROCESS |
Country Status (5)
Country | Link |
---|---|
KR (1) | KR960013983A (en) |
AT (1) | AT404031B (en) |
BE (1) | BE1009555A3 (en) |
DE (1) | DE19534545C2 (en) |
TW (1) | TW297017B (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT403665B (en) * | 1996-10-30 | 1998-04-27 | Andritz Patentverwaltung | METHOD AND SYSTEM FOR THE SEPARATION OF FINE OXIDE PARTICLES |
DE19829592C1 (en) * | 1998-07-02 | 1999-12-09 | Umweltanalytisches Zentrum Gro | Mineral acids containing metals from pickling plants are processed and recovered |
AT411575B (en) * | 2002-07-25 | 2004-03-25 | Kcs Austria Engineering Gmbh | Regeneration of steelworks spray-roasting pickling solutions, comprises filtering settled solution using transverse-flow microfilter |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2423385A (en) * | 1944-07-27 | 1947-07-01 | Chemical Foundation Inc | Process of pickling and of recovering pickling agent |
GB872185A (en) * | 1958-05-18 | 1961-07-05 | Monsanto Canada Ltd | Resin syrups |
AT307849B (en) * | 1971-11-11 | 1973-06-12 | Oesterr Alpine Montan | Process for rendering the iron salts from pickling iron objects harmless |
DE3632638A1 (en) * | 1986-09-25 | 1988-03-31 | Hoechst Ag | Process for tanning leather |
DE3943215A1 (en) * | 1989-12-28 | 1991-07-04 | Inst Chemii Przemyslowej | High-flow, heat-curable compsn. for cleaning moulding tools - by plasticising mixt. of melamine-formaldehyde] resin, filler, glycol, urea and/or triazine derivs. |
BE1005822A3 (en) * | 1992-05-19 | 1994-02-08 | Dsm Nv | Modified melamine formaldehyde-resin compound |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5039438B2 (en) * | 1972-03-10 | 1975-12-17 | ||
AT315603B (en) * | 1972-08-03 | 1974-06-10 | Ruthner Ind Planungs Ag | Process for regenerating zinc-containing hydrochloric iron pickling solutions |
JPS5415496A (en) * | 1977-07-06 | 1979-02-05 | Chiyoda Chem Eng & Constr Co Ltd | Method of improving in roasting waste hydrochloric acid |
DE3338258A1 (en) * | 1983-10-21 | 1985-05-02 | Hamm Chemie GmbH, 4100 Duisburg | METHOD FOR TREATING IRON AND ZINC-CONTAINING SALT ACID |
JPS63156017A (en) * | 1986-07-26 | 1988-06-29 | Kemiraito Kogyo Kk | Production of powdery compound oxide for raw material of ferrite |
-
1994
- 1994-10-14 AT AT0194594A patent/AT404031B/en not_active IP Right Cessation
-
1995
- 1995-09-18 DE DE19534545A patent/DE19534545C2/en not_active Expired - Fee Related
- 1995-09-26 TW TW084110061A patent/TW297017B/zh active
- 1995-10-03 BE BE9500817A patent/BE1009555A3/en not_active IP Right Cessation
- 1995-10-05 KR KR1019950034098A patent/KR960013983A/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2423385A (en) * | 1944-07-27 | 1947-07-01 | Chemical Foundation Inc | Process of pickling and of recovering pickling agent |
GB872185A (en) * | 1958-05-18 | 1961-07-05 | Monsanto Canada Ltd | Resin syrups |
AT307849B (en) * | 1971-11-11 | 1973-06-12 | Oesterr Alpine Montan | Process for rendering the iron salts from pickling iron objects harmless |
DE3632638A1 (en) * | 1986-09-25 | 1988-03-31 | Hoechst Ag | Process for tanning leather |
DE3943215A1 (en) * | 1989-12-28 | 1991-07-04 | Inst Chemii Przemyslowej | High-flow, heat-curable compsn. for cleaning moulding tools - by plasticising mixt. of melamine-formaldehyde] resin, filler, glycol, urea and/or triazine derivs. |
BE1005822A3 (en) * | 1992-05-19 | 1994-02-08 | Dsm Nv | Modified melamine formaldehyde-resin compound |
Also Published As
Publication number | Publication date |
---|---|
BE1009555A3 (en) | 1997-05-06 |
KR960013983A (en) | 1996-05-22 |
ATA194594A (en) | 1997-12-15 |
DE19534545C2 (en) | 1998-07-30 |
TW297017B (en) | 1997-02-01 |
DE19534545A1 (en) | 1996-04-18 |
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