DE1743473U - DEVICE FOR RECOVERY OF SILVER FROM PHOTOGRAPHIC FASTENING STRIPS. - Google Patents
DEVICE FOR RECOVERY OF SILVER FROM PHOTOGRAPHIC FASTENING STRIPS.Info
- Publication number
- DE1743473U DE1743473U DE19561743473 DE1743473U DE1743473U DE 1743473 U DE1743473 U DE 1743473U DE 19561743473 DE19561743473 DE 19561743473 DE 1743473 U DE1743473 U DE 1743473U DE 1743473 U DE1743473 U DE 1743473U
- Authority
- DE
- Germany
- Prior art keywords
- silver
- recovery
- photographic
- fastening strips
- fixer
- 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
Links
Landscapes
- Electrolytic Production Of Metals (AREA)
Description
Vorrichtung zur Rückgewinnung von Silber aus fotografischen Fixierbädern.Device for the recovery of silver from photographic fixing baths.
Es ist bekannt, Silber aus fotografischen Fixierbädern durch elektrolytische Abscheidungsvorgänge wieder zu gewinnen. Bei den für diesen Zweck verwendeten Vorrichtungen dient als Anode üblicherweise ein Blech aus nichtrostendem Stahl. It is known to fix silver from photographic fixers by electrolytic To recover deposition processes. In the devices used for this purpose A sheet made of stainless steel is usually used as the anode.
Diese Anordnung hat den Nachteil, dass dieses Blech anodisch leicht korrodiert, so dass ein erheblicher Verschleiss an Anodenmaterial eintritt und das Fixierbad in Folge gelöster Fremdmetalle unbrauchbar wird. Ausserdem ist als Kathodenmaterial Feinsilberblech erforderlich, welches nach beendeter Elektrolyse nur noch als Abfallsilber gehandelt werden kann. Die freiwerdende Säure an der Anode hat eine starke Schwefelabscheidung zur Folge, wodurch das Fixierbad stark eingetrübt und unbrauchbar wird. Überdies bewirkt das sich hierbei bildende Schwefeldioxyd eine gesundheitsschädigende Geruchsbelästigung.This arrangement has the disadvantage that this sheet is anodically light corrodes, so that there is considerable wear and tear on the anode material and that Fixing bath becomes unusable as a result of dissolved foreign metals. It is also used as a cathode material Fine silver sheet required, which is only used as waste silver after the electrolysis has ended can be traded. The acid released on the anode has a strong sulfur deposit as a result, making the fixer very cloudy and unusable. Besides The sulfur dioxide that is formed in the process causes an unpleasant odor that is harmful to health.
Die vorliegende Erfindung betrifft eine Vorrichtung zur Regenerierung von Fixierbädern unter gleichzeitiger Rückgewinnung des gelösten Silbers und Vermeidung der vorstehend geschilderten Nachteile. Dies wird dadurch erreicht, dass als Kathode Kupfer oder Messing verwendet wird, welches gegebenenfalls passiviert wird, z. B. durch Eintauchen in verdünnte Bichromatlösung. Als Anodenmaterial ist Graphit geeignet, da es nicht angegriffen wird. Für die Weiterverwendung des Fixierbades muss die Bildung von Schwefel und Schwefeldioxyd vermieden werden. The present invention relates to a device for regeneration of fixing baths with simultaneous recovery of the dissolved silver and avoidance the disadvantages outlined above. This is achieved by acting as a cathode Copper or brass is used, which is optionally passivated, e.g. B. by immersion in dilute bichromate solution. Graphite is suitable as anode material, since it is not attacked. For further use of the fixer the The formation of sulfur and sulfur dioxide can be avoided.
Dies ist dadurch möglich, dass die Anode sich in einem unzersetzlichen Elektrolyten befindet, der durch ein Diaphragma aus Keramik, porösem Kunststoff oder Kautschuk von der Fixiersalzlösung getrennt ist.This is possible because the anode is in an indecomposable one Electrolyte is located by a diaphragm made of ceramic, porous plastic or rubber is separated from the fixing salt solution.
Die Vorrichtung wird für Fixierbäder sowohl im diskontinuierlichen als auch vor allem im kontinuierlichen Betrieb verwendet. Die verbrauchte Fixierlösung wird mittels einer selbstansaugenden Umwälzpumpe 11 aus dem Fixiertank 10 in die Elektrolysiervorrichtung geleitet, die sich im einzelnen wie folgt zusammensetzt : Aus einem Abscheidegehäuse 7, der Kathode 6 und der Anode 1, der Silberahlagerung 5,-dem Elektrolyten 4, dem Diaphragma 3 und dem Anolyten 2. Die Fixiersalzlösung, läuft nach der Elektrolyse über die Leitung 8 durch ein leicht auswechselbares und für diesen Zweck geeignetes Filter 9, um gegebenenfalls von festen Verunreinigungen befreit zu werden. The device is used for fixers both in discontinuous as well as mainly used in continuous operation. The consumed Fixing solution is drawn from the fixing tank by means of a self-priming circulating pump 11 10 passed into the electrolyzer, which is composed in detail as follows : From a separator housing 7, the cathode 6 and the anode 1, the silver storage 5, -the electrolyte 4, the diaphragm 3 and the anolyte 2. The fixing salt solution, runs after the electrolysis via line 8 through an easily replaceable and Suitable filter 9 for this purpose to remove any solid impurities to be set free.
Während der Elektrolyse können Stromdichten von 200 mA/dm2 2 angewendet werden, so dass in einer Stunde 800 mg Silber je 1 dm Kathodenoberfläche abgeschieden werden. Current densities of 200 mA / dm2 2 can be used during electrolysis so that 800 mg of silver per 1 dm cathode surface are deposited in one hour will.
Da sich an der Kathode leicht basische Silbersalze abscheiden, wenn der pH-Wert des Bades zu hoch ist, empfiehlt es sich, das Fixierbad vor der Elektrolyse gegebenenfalls anzusäuren. Hierzu hat sich eine entsprechende Zugabe von sauren Sulfiten bewährt. Since slightly basic silver salts are deposited on the cathode, if If the pH of the bath is too high, it is advisable to use the fixer before electrolysis optionally to be acidified. For this purpose, an appropriate addition of acidic Proven sulfites.
Ein pH-Wert zwischen 4 und 5 ist für die Elektrolyse günstig.A pH value between 4 and 5 is favorable for electrolysis.
Durch Zugabe von Kolloiden werden die Silberniederschläge glatt und hell erhalten. Trotz dabei angewendeter höherer Stromdichten entwickelt sich an der Kathode kein Schwefelwasserstoff.By adding colloids, the silver precipitates become smooth and bright received. Despite the higher current densities used, the the cathode does not contain hydrogen sulfide.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19561743473 DE1743473U (en) | 1956-05-09 | 1956-05-09 | DEVICE FOR RECOVERY OF SILVER FROM PHOTOGRAPHIC FASTENING STRIPS. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19561743473 DE1743473U (en) | 1956-05-09 | 1956-05-09 | DEVICE FOR RECOVERY OF SILVER FROM PHOTOGRAPHIC FASTENING STRIPS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1743473U true DE1743473U (en) | 1957-04-18 |
Family
ID=32739530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19561743473 Expired DE1743473U (en) | 1956-05-09 | 1956-05-09 | DEVICE FOR RECOVERY OF SILVER FROM PHOTOGRAPHIC FASTENING STRIPS. |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE1743473U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1133565B (en) * | 1958-04-21 | 1962-07-19 | Gertrud Dettweiler Geb Schultz | Device for the electrolytic deposition of silver from photographic fixing baths |
-
1956
- 1956-05-09 DE DE19561743473 patent/DE1743473U/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1133565B (en) * | 1958-04-21 | 1962-07-19 | Gertrud Dettweiler Geb Schultz | Device for the electrolytic deposition of silver from photographic fixing baths |
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