DE1642400A1 - Process for the detoxification of cyanide-containing aqueous solutions - Google Patents
Process for the detoxification of cyanide-containing aqueous solutionsInfo
- Publication number
- DE1642400A1 DE1642400A1 DE19681642400 DE1642400A DE1642400A1 DE 1642400 A1 DE1642400 A1 DE 1642400A1 DE 19681642400 DE19681642400 DE 19681642400 DE 1642400 A DE1642400 A DE 1642400A DE 1642400 A1 DE1642400 A1 DE 1642400A1
- Authority
- DE
- Germany
- Prior art keywords
- cyanide
- detoxification
- aqueous solutions
- containing aqueous
- reaction
- 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.)
- Pending
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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Description
Verfahren zur Entgiftung von cyanidhaltigen wässrigen Lösungen. Cyanide werden in der Härtetechnik zum Aufkohlen und in der Galvanotechnik in grossem Umfang eingesetzt. Freie Cyanide sind als hochtoxische Verbindungen bekannt, und im Abwasser muss eine Entgiftung bis zu einem Cyanidgehalt von 0,1 mg/1 vorgenommen werden. Die Zerstörung bzw. Entgiftung des Cyanids erfolgt in den meisten Fällen durch Oxydation zu Cyanat und Carbonat. Als Oxydationsmittel verwendet man vor allem Chlorgas und Chlorbleichlauge. Dabei fallen hohe Chemikalienkosten an, una auseerdem erfolgt eine zusätzliche Versalzung des Ab- wassers. Von geringer Bedeutung sind wegen der noch höheren Aetriebskosten die elektrolytische Oxydation und das Austreiben (Aer Blausäure in saurer Lösung und deren anschliessende Verbrennung.Process for the detoxification of cyanide-containing aqueous solutions. Cyanides are used to a large extent in hardening technology for carburizing and in electroplating technology. Free cyanides are known to be highly toxic compounds, and wastewater must be decontaminated up to a cyanide content of 0.1 mg / l. The destruction or detoxification of the cyanide takes place in most cases by oxidation to cyanate and carbonate. The main oxidizing agents used are chlorine gas and sodium hypochlorite. Here, high chemical costs are incurred, una auseerdem an additional salinization takes place the waste water. Because of the even higher operating costs, electrolytic oxidation and expulsion are of little importance (Cyanide in acidic solution and its subsequent combustion.
Der Erfindung liegt nun der Gedanke zugrunde, Cyanid mit Luftsauerstoff zu oxydieren, was thermodynamisch zwar möglich, bisher abor nicht realisiert werden konnte, weil die Reaktionsgescnwindigkeit praktisch Null ist.The invention is based on the idea of using cyanide with atmospheric oxygen to oxidize, which is thermodynamically possible, but has not yet been realized because the reaction rate is practically zero.
Es wurde nun überraschenderweise gefunden, dass die Reaktion zwischen Cyanid und Luftsauerstoff an bestimmten Kontakt-# K"italysatoren quantitativ abläuft. Besonders geeignet ist tjüchaktive Holzkohle. Lässt man eine wässrige Cyanidlösung iu, alkalischen Bereich mit Luftsauerstoff gemischt über Säulen, die mit dem Katalysator gefüllt sind, laufen, dann ist eine Methode gegeben, das Cyanid auf sehr billige Weise ohne zusätzliche Versalzung des Abwassers zu zerstören. Noch wirksamer ist die Reaktion, wenn Luft und wässrige Cyanidlösung pulsierend durch die mit Holzkohle gefüllte Kolonne gedrückt werden, wobei die Wahrscheinlichkeit, dass Cyanid am Katalysator zur Reaktion gelangt, erhöht wird.It has now surprisingly been found that the reaction between Cyanide and atmospheric oxygen run off quantitatively at certain contact analyzers. Active charcoal is particularly suitable. Leaves an aqueous cyanide solution iu, alkaline area mixed with atmospheric oxygen over columns containing the catalyst are filled, run, then a method is given, the cyanide on very cheap Way to destroy the wastewater without additional salinization. Even more effective is the reaction when air and aqueous cyanide solution pulsate through the charcoal filled column are pressed, with the probability that cyanide on the catalyst comes to a reaction, is increased.
Aus vielen Versuchen mögen zwei Beispiele als Erläuterung dienen: Beispiel 1 Eine wässrige Cyanidlösung 8 g/1 wurde durch eine mit hochaktiv-er Holzkohle gefüllte Kolonne mit 200 1 Luft bei Zimmertemperatur 7 Stunden zur Reaktion-gebracht. 98 - 99 % des eingesetzten Cyanids waren zu Cyanat und meistens zu Carbonat oxydiert. Beispiel-2 195 g Cyanid/1 wurden mit 52 1 Luft gemischt,-bei Zimmertemperatur 11,5 Stunden an hochaktiver Holzkohle zur Reaktion gebracht, 99999 % der Cyanidmenge war zu Cyanat und Carbonat oxydIert. Die Reaktion kann bei'Temperaturen zwischen Raumtemperatur und dem Siedepunkt der zu behandelnden Lösungen durchgeführt werden.Two examples from many experiments may serve as an illustration: Example 1 An aqueous cyanide solution 8 g / l was reacted through a column filled with highly active charcoal with 200 l of air at room temperature for 7 hours. 98-99% of the cyanide used was oxidized to cyanate and mostly to carbonate. Example-2 195 g cyanide / l were mixed with 52 l of air, -reacted on highly active charcoal for 11.5 hours at room temperature, 99999% of the amount of cyanide was oxidized to cyanate and carbonate. The reaction can be carried out at temperatures between room temperature and the boiling point of the solutions to be treated.
Claims (2)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US776755A US3586623A (en) | 1968-01-12 | 1968-11-18 | Process for detoxification of cyanide containing aqueous solutions |
| FR1595992D FR1595992A (en) | 1968-01-12 | 1968-12-09 | |
| GB1258274D GB1258274A (en) | 1968-01-12 | 1969-01-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED0055096 | 1968-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE1642400A1 true DE1642400A1 (en) | 1972-01-05 |
Family
ID=7056246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19681642400 Pending DE1642400A1 (en) | 1968-01-12 | 1968-01-12 | Process for the detoxification of cyanide-containing aqueous solutions |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH505031A (en) |
| DE (1) | DE1642400A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3421113A1 (en) * | 1983-06-08 | 1984-12-13 | Culligan Int Co | FILTER DEVICE AND METHOD FOR REMOVING IRON AND / OR OTHER CHEMICAL REDUCING SUBSTANCES FROM DRINKING WATER |
-
1968
- 1968-01-12 DE DE19681642400 patent/DE1642400A1/en active Pending
- 1968-10-18 CH CH1559968A patent/CH505031A/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3421113A1 (en) * | 1983-06-08 | 1984-12-13 | Culligan Int Co | FILTER DEVICE AND METHOD FOR REMOVING IRON AND / OR OTHER CHEMICAL REDUCING SUBSTANCES FROM DRINKING WATER |
Also Published As
| Publication number | Publication date |
|---|---|
| CH505031A (en) | 1971-03-31 |
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