DE3700826A1 - Anode material for operating an electroflotation cell for the purification of waste waters heavily contaminated with corrosion inhibitors and of alkaline cleaning solutions - Google Patents

Anode material for operating an electroflotation cell for the purification of waste waters heavily contaminated with corrosion inhibitors and of alkaline cleaning solutions

Info

Publication number
DE3700826A1
DE3700826A1 DE19873700826 DE3700826A DE3700826A1 DE 3700826 A1 DE3700826 A1 DE 3700826A1 DE 19873700826 DE19873700826 DE 19873700826 DE 3700826 A DE3700826 A DE 3700826A DE 3700826 A1 DE3700826 A1 DE 3700826A1
Authority
DE
Germany
Prior art keywords
anode material
purification
alkaline cleaning
cleaning solutions
electroflotation
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Withdrawn
Application number
DE19873700826
Other languages
German (de)
Inventor
Edgar Dipl Ing Renzler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19873700826 priority Critical patent/DE3700826A1/en
Publication of DE3700826A1 publication Critical patent/DE3700826A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/465—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/006—Alloys based on aluminium containing Hg
    • 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
    • C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
    • C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
    • C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/12—Electrodes characterised by the material
    • C23F13/14—Material for sacrificial anodes
    • 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
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material

Abstract

The invention relates to the production of anode material for the purification of waste water and alkaline cleaning solutions. Depolarising and activating alloy constituents are added to the material so that purification of waste water or removal of oil from alkaline cleaning solutions is possible in the presence of corrosion inhibitors.

Description

Aus der Offenlegungsschrift DE 35 28 198 A1 ist ein Verfahren zur Rege­ neration alkalischer Reinigungslösungen bekannt, bei welchem zur Ver­ meidung von passivierenden Oxidschichten auf der Oberfläche der Opfer­ anoden mit beständigen Elektroden gearbeitet wird, welche aus z. B. Edelstahl oder Platin bestehen können. Das als Opferanode dienende Material, meistens Aluminium, wird dabei in ein symmetrisches Feld de­ finierter Feldstärke eingebracht und die Opferanode so mit hinrei­ chender Geschwindigkeit aufgelöst um beim Übergang vom Ionenzustand zum Hydroxid, Elektronen zur Ladungskompensation zu erhalten.DE 35 28 198 A1 discloses a method for rain generation of alkaline cleaning solutions known, in which Ver avoidance of passivating oxide layers on the surface of the victim anodes are worked with durable electrodes, which consist of z. B. Stainless steel or platinum can exist. The one that serves as the sacrificial anode Material, mostly aluminum, is placed in a symmetrical field field strength introduced and the sacrificial anode with it speed to resolve the transition from the ion state to the hydroxide, to get electrons for charge compensation.

Die Schwierigkeit besteht nun darin, daß die Auflösung der Opferanode in Gegenwart von Korrosionsinhibitoren nur sehr langsam vor sich geht, wenn marktübliche Aluminiumlegierungen eingesetzt werden. Der Prozeß kann jedoch erheblich beschleunigt werden und der Energie­ bedarf kann erheblich herabgesetzt werden, wenn mit Gußlegierungen aus Aluminium gearbeitet wird, welche zwei oder mehrere der folgenden Zu­ sätze enthalten:The difficulty now is that the dissolution of the sacrificial anode is very slow in the presence of corrosion inhibitors, if standard aluminum alloys are used. However, the process can be speeded up considerably and the energy Requirement can be significantly reduced if using cast alloys Aluminum is worked, which is two or more of the following sets include:

0,5 - 8,0 Gew.-% Kupfer
0,01 - 1,0 Gew.-% Quecksilber
0,5 - 5,0 Gew.-% Zink
0,1 - 0,9 Gew.-% Eisen und Silizium gemeinsam
0,1 - 0,8 Gew.-% Titan
0,2 - 0,6 Gew.-% Mangan0.5 - 8.0 wt% copper
0.01 - 1.0 wt% mercury
0.5 - 5.0 wt% zinc
0.1-0.9% by weight of iron and silicon together
0.1-0.8 wt% titanium
0.2-0.6 wt% manganese

Derart gegossene Legierungen sind in der Lage auch in wäßrigen Lösungen welche z. B. 1000-5000 mg Phosphat/l enthalten in ausrei­ chender Zeit bei geringen Potentialen Hydroxide zu bilden, wobei die Verhinderung von Deckschichten aus Al(OH)3 oder sonstigen Hydraten durch Rühren oder durch die gasenden Elektroden gemäß der Offenlegungs­ schrift DE 35 28 198 A1 erfolgt. Such cast alloys are also able in aqueous solutions which, for. B. 1000-5000 mg phosphate / l contain sufficient time to form hydroxides at low potentials, the prevention of outer layers of Al (OH) 3 or other hydrates by stirring or by the gassing electrodes according to the published patent application DE 35 28 198 A1 is done.

Von wesentlicher Bedeutung ist bei dem Prozeß, daß das Potential der Opferanoden unterhalb des pH-abhängigen Flade-Potentials betrieben wird, um die Bildung von Al2O3 an der Oberfläche der Opferanode zu vermeiden. In Wasser gelöster Sauerstoff, welcher in die Diffusionsgrenzschicht der Opferanoden eindringen könnte, wird durch die beständige Elektrode in Hydroxidionen überführt, welche eine pH-Wert Erhöhung der gesamten Lösung herbeiführt, so daß selbst bei neutralen Lösungen genug OH-Ionen vorhanden sind um Al(OH)3 zu bilden und zu fällen.It is essential in the process that the potential of the sacrificial anodes is operated below the pH-dependent flat potential in order to avoid the formation of Al 2 O 3 on the surface of the sacrificial anode. Oxygen dissolved in water, which could penetrate into the diffusion boundary layer of the sacrificial anodes, is converted into hydroxide ions by the permanent electrode, which brings about a pH increase in the entire solution, so that even with neutral solutions, enough OH ions are present to Al (OH ) 3 to form and cut.

Claims (3)

1. Anodenmaterial zum Betrieb einer Elektroflotationszelle für die Reinigung von korrosionsinhibitorhaltigen Abwässern und alkalischen Reinigungslösungen, dadurch gekennzeichnet, daß die Anoden aus Aluminium mit einem oder mehreren der folgenden Zusätze gegossen und in die entsprechenden Anlagen eingesetzt werden, wobei folgende Zusätze Anwendung finden: 0,5 - 8,0 Gew.-% Cu
0,01 - 0,1 Gew.-% HG
0,5 - 5,0 Gew.-% Zn
0,1 - 0,9 Gew.-% Fe und Si gemeinsam
0,1 - 0,8 Gew.-% Ti
0,2 - 0,6 Gew.-% Mn1. Anode material for operating an electroflotation cell for the cleaning of corrosion inhibitor-containing wastewater and alkaline cleaning solutions, characterized in that the anodes are cast from aluminum with one or more of the following additives and used in the corresponding systems, the following additives being used: 0.5 - 8.0 wt% Cu
0.01-0.1 wt% HG
0.5 - 5.0 wt% Zn
0.1-0.9% by weight of Fe and Si together
0.1-0.8% by weight of Ti
0.2-0.6 wt% Mn 2. Anodenmaterial nach Anspruch 1, dadurch gekennzeichnet, daß das Ma­ terial nach dem Gießen einer entsprechenden Wärmebehandlung zuge­ führt wird, um die Gitterenergie herabzusetzen und durch Gitter­ fehlstellen eine leichtere Metallauflösung zu erreichen.2. Anode material according to claim 1, characterized in that the Ma material after casting a corresponding heat treatment leads to reduce the lattice energy and by lattice to achieve easier metal dissolution. 3. Anodenmaterial nach Anspruch 1 und 2, dadurch gekennzeichnet, daß die Anoden in beliebiger Form gegossen werden können, vorzugsweise als lange, rechteckige Platten von 5 bis 10 mm Stärke.3. Anode material according to claim 1 and 2, characterized in that the anodes can be cast in any shape, preferably as long, rectangular plates with a thickness of 5 to 10 mm.
DE19873700826 1987-01-14 1987-01-14 Anode material for operating an electroflotation cell for the purification of waste waters heavily contaminated with corrosion inhibitors and of alkaline cleaning solutions Withdrawn DE3700826A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19873700826 DE3700826A1 (en) 1987-01-14 1987-01-14 Anode material for operating an electroflotation cell for the purification of waste waters heavily contaminated with corrosion inhibitors and of alkaline cleaning solutions

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873700826 DE3700826A1 (en) 1987-01-14 1987-01-14 Anode material for operating an electroflotation cell for the purification of waste waters heavily contaminated with corrosion inhibitors and of alkaline cleaning solutions

Publications (1)

Publication Number Publication Date
DE3700826A1 true DE3700826A1 (en) 1988-07-28

Family

ID=6318783

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19873700826 Withdrawn DE3700826A1 (en) 1987-01-14 1987-01-14 Anode material for operating an electroflotation cell for the purification of waste waters heavily contaminated with corrosion inhibitors and of alkaline cleaning solutions

Country Status (1)

Country Link
DE (1) DE3700826A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5435920A (en) * 1991-01-15 1995-07-25 Koch Berthold Method of separating emulsions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5435920A (en) * 1991-01-15 1995-07-25 Koch Berthold Method of separating emulsions

Similar Documents

Publication Publication Date Title
EP0018592A1 (en) Process for the regeneration of ammoniacal etching solutions for etching metallic copper
DE2432354A1 (en) METHOD OF PURIFYING WASTE WATER BY ELECTROLYSIS
DE3020012C2 (en) Method of exposing the silicon crystals on the surface of a body made of an aluminum alloy with a high silicon content
DE2845736C2 (en)
DE2622928A1 (en) METHODS TO PREVENT POLLUTION FROM ELECTROLYTIC MACHINING METHODS
DE2023024A1 (en) Process for the production of manganese dioxide with a low potassium content
DE3700826A1 (en) Anode material for operating an electroflotation cell for the purification of waste waters heavily contaminated with corrosion inhibitors and of alkaline cleaning solutions
DE1421994A1 (en) Process, device and means for cleaning metal surfaces
DE2917019C2 (en) Process for the metallization of composite material and bath composition suitable for this
DE3508360C2 (en)
DE2710459C2 (en) Process for electrolytic descaling of a metallic body and its application to alloy steel
DE1496947A1 (en) Process for the production of corrosion-resistant, oxidized metal surfaces
EP0612359B1 (en) Method for recycling used pickling liquors
DE2243559A1 (en) METHOD FOR ELECTROLYTIC PURIFICATION OF WASTE WATER
DE1816608A1 (en) Process for removing impurities from a solution of zinc to be refined by the wet process
DE2621144C3 (en) Process for processing non-ferrous metal hydroxide sludge waste
DE323066C (en) Process for cleaning the surface of objects made of iron or steel by electrolytic means
DE893740C (en) Process for the production of protective coatings on metals such as magnesium and its alloys
DE2921812C2 (en) Process for producing steels with high permeability and Goss texture
DE349227C (en) Process for coloring metallic surfaces
DD267265A5 (en) METHOD FOR REMOVING THE GROUND AND OXYDES OF METALS, METAL ALLOYS, ESPECIALLY ALLOYED STEELS, HIGH-ALLOY STEELS AND CARBON STEELS BY MEANS OF A FERROUS (III) -ION FILLING MOISTURE
DE476344C (en) Process for the production of accumulator plates
DE2427133C2 (en) Process for the recovery of metals, in particular zinc, from a metal waste which contains chlorides and / or other halides and other undesired metal salts, in particular nitrates or anions which form phosphates
DE891649C (en) Process for the production of coatings on nickel and nickel alloys
DE1269443B (en) Process for electrolytic degreasing, pickling and, if necessary, polishing of metals

Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee