DE814080C - Process for removing foreign metal ions from chromic acid electrolytes - Google Patents

Process for removing foreign metal ions from chromic acid electrolytes

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Publication number
DE814080C
DE814080C DE1949P0053157 DEP0053157D DE814080C DE 814080 C DE814080 C DE 814080C DE 1949P0053157 DE1949P0053157 DE 1949P0053157 DE P0053157 D DEP0053157 D DE P0053157D DE 814080 C DE814080 C DE 814080C
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DE
Germany
Prior art keywords
metal ions
chromic acid
foreign metal
removing foreign
acid electrolytes
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
Application number
DE1949P0053157
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German (de)
Inventor
Heinz W Dipl-Chem Dr Dettner
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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 DE1949P0053157 priority Critical patent/DE814080C/en
Application granted granted Critical
Publication of DE814080C publication Critical patent/DE814080C/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/16—Regeneration of process solutions
    • C25D21/18—Regeneration of process solutions of electrolytes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Description

Verfahren zur Entfernung von Freradmetallionen aus Chromsäureelektrolyten Gegenstand der E rfindung ist ein Verfahren zurr Abscheidung von Fremdmetallionen aus einem Chromsäure enthaltenden Elektrolyten mit Hilfe des elektrischen Stromes.Rfindung process for removing Freradmetallionen of chromic acid electrolyte subject matter of the E is a method lashing deposition of foreign metal ions from a chromic acid-containing electrolyte by means of electric current.

Durch anodische Lösung reichern sich Chrombäder mit Fremdmetallen, insbesondere Eisen, an. Während ein geringer Gehalt bis etwa 3 9 je Liter die Strornausbeute verbessert, verschlechtert sie ein noch größerer Gehalt an Fremdmetallionen, so daß es zur Ausbildung unbrauchbarer Schichten kommt und endlich die Chromabscheidung ganz aufhört.Anodic solution enriches chromium baths with foreign metals, especially iron. While a low content of up to about 39 per liter improves the current yield, an even higher content of foreign metal ions worsens it, so that unusable layers are formed and finally the chromium deposition ceases completely.

Die seither bekannten Verfahren zur Entfernung der Fremdmetallionen erwiesen sich in der Praxis als unzulänglich, weil sie entweder andere Fremdmetallionen in das Bad brachten' oder aber ihre Ausbeute züi gering war. In den meisten Fällen wurde jedoch so verfahren, daß das Bad ganz oder zum Teil neu angesetzt wurde, wodurch Verluste an wertvoller Chromsäure entstanden.The methods known since then for removing foreign metal ions turned out to be inadequate in practice because they either contain other foreign metal ions brought into the bath or their yield was too small. In most cases however, the procedure was such that the bath was completely or partially remade, whereby Loss of valuable chromic acid occurred.

Es wurde nun die Beobachtung gemacht, daß die Entfernung von Frerndmetallionen dadurch möglich ist, daß diese durch elektroosmotische Wirkung des elektrischen Stromes in ein Diaphragma einwandern, welches in das Chrombad eingehängt wird. In dem Diaphragmaraum befindet sich die aus Eisen, Kupfer oder einem anderen Metall bestehende Kathode. Zur Regenerierung des Chrombades wird ein Gleichstrom von 5 bis 15 V Spannung ohne überlagerung mit Wechselstrom verwendet. Der Inhalt des Diaphragmas besteht aus leicht angesäuertem destilliertem Wasser. Nach Beendigung der Regenerierung wird der eisenhaltige Inhalt des Diaphragmas ausgeschüttet und das -Diaphragma erneut zur weiteren Entfernung der Fremdmetallionen verwendet. Zum geringen Teil findet auch Abscheidung der.Fremdmetalle auf der Kathode statt.The observation has now been made that the removal of foreign metal ions is possible because they migrate into a diaphragm, which is hung in the chrome bath, through the electroosmotic effect of the electric current. The cathode made of iron, copper or another metal is located in the diaphragm space. A direct current of 5 to 15 V voltage without superimposition with alternating current is used to regenerate the chrome bath. The content of the diaphragm consists of slightly acidified distilled water. When the regeneration is complete, the iron-containing content of the diaphragm is poured out and the diaphragm is used again to further remove the foreign metal ions. To a lesser extent, foreign metals are also deposited on the cathode.

Zur Erläuterung möge folgendes Beispiel dienen: Aus einem Chrombad, das im Liter 270 9 Chromsäure und 18 g Eisen enthält, werden nach Anwendung dieses Verfahrens im Diaphragmenraum ein Chromsäuregehalt von 3 9 und ein Eisengehalt von 4 9 im Liter nachgewiesen. Während somit im Chrombad das Verhältnis des Eisens zur Chromsäure wie . i : 15 ist, ist dieses nach Beendigung der ReLyenerierunL- im Diaphramenraum wie i : o,7-;.The following example serves as an illustration: From a chromium bath, which contains 270 9 chromic acid and 18 g iron per liter, a chromic acid content of 3 9 and an iron content of 4 9 per liter are detected in the diaphragm chamber after using this method. While the ratio of iron to chromic acid in the chrome bath is like . i : 15 , this is after the completion of the regeneration in the diaphragm space as i : o, 7- ;.

Claims (1)

PATENTANSPRUCH: Verfahren zur Entfernung von Fremdmetallionen aus Chromsäureelektrolyten mit Hilfe des elektrischen Stromes, dadurch gekennzeichnet, daß man die Kathode mit einem Diaphragma umgibt, den Diaphragmenraum mit leicht angesäuertem destilliertem Wasser füllt und dann mit Gleichstrom elektrolysiert. Claim: method for removing foreign metal ions from chromic acid electrolytes with the aid of electric current, characterized in that the cathode is surrounded by a diaphragm, the diaphragm space is filled with slightly acidic distilled water and then electrolyzed with direct current.
DE1949P0053157 1949-08-28 1949-08-28 Process for removing foreign metal ions from chromic acid electrolytes Expired DE814080C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1949P0053157 DE814080C (en) 1949-08-28 1949-08-28 Process for removing foreign metal ions from chromic acid electrolytes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1949P0053157 DE814080C (en) 1949-08-28 1949-08-28 Process for removing foreign metal ions from chromic acid electrolytes

Publications (1)

Publication Number Publication Date
DE814080C true DE814080C (en) 1951-09-20

Family

ID=578615

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1949P0053157 Expired DE814080C (en) 1949-08-28 1949-08-28 Process for removing foreign metal ions from chromic acid electrolytes

Country Status (1)

Country Link
DE (1) DE814080C (en)

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