DE1135665B - Process for the recovery of chlorine from waste gases containing arsenic chloride - Google Patents
Process for the recovery of chlorine from waste gases containing arsenic chlorideInfo
- Publication number
- DE1135665B DE1135665B DED38360A DED0038360A DE1135665B DE 1135665 B DE1135665 B DE 1135665B DE D38360 A DED38360 A DE D38360A DE D0038360 A DED0038360 A DE D0038360A DE 1135665 B DE1135665 B DE 1135665B
- Authority
- DE
- Germany
- Prior art keywords
- iron
- chloride
- arsenic
- reaction
- oxide
- 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
- 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
- C01B7/03—Preparation from chlorides
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
Description
Verfahren zur Rückgewinnung von Chlor aus arsenchloridhaltigen Abgasen Bei der chlorierenden Behandlung arsenhaltiger Erze und hüttenmännischer Zwischenprodukte (Speisen od. dgl.) fallen arsenchloridhaltige Abgase an, aus denen das Arsenchlorid wegen seiner Giftigkeit vor deren Abgabe in die Atmosphäre entfernt werden muß. Es ist bekannt, das Arsenchlorid aus diesen Abgasen durch Auswaschen mit Wasser zu entfernen und aus den Waschwässern nach Oxydation des Arsens zu Arsensäure durch Zugabe von Eisen(111)-salzen und Kalk als Eisenarsenat zu fällen. Bei diesem Verfahren geht das gesamte vorher an das Arsen gebundene Chlor als Calciumchlorid verloren. Der bei der Arsenfällung anfallende Eisenarsenatschlamm ist schwer absetzbar.Process for the recovery of chlorine from waste gases containing arsenic chloride In the chlorinating treatment of ores containing arsenic and metallurgical intermediate products (Food or the like) arsenic chloride-containing exhaust gases are produced, from which the arsenic chloride must be removed before being released into the atmosphere because of its toxicity. It is known to remove the arsenic chloride from these exhaust gases by washing them out with water to remove and from the washing water after oxidation of the arsenic to arsenic acid through Adding iron (111) salts and lime as iron arsenate to precipitate. In this procedure all the chlorine previously bound to the arsenic is lost as calcium chloride. The iron arsenate sludge resulting from arsenic precipitation is difficult to settle.
Nachstehend wird ein Verfahren zur trockenen Aufarbeitung von Arsenchlorid bzw. arsenchloridhaltigen Abgasen beschrieben, das diese Nachteile vermeidet. Es besteht darin, daß die arsenchloridhaltigen Abgase der Chlorierungsanlage mit der für die Oxydation des Arsenchlorids zum Arsenat erforderlichen Menge Sauerstoff in Form von Sauerstoff, Luft oder anderen sauerstoffhaltigen Gasen in geringem Überschuß vermischt werden und die Gase bei Temperaturen zwischen 500 und 9001 C, vorzugsweise 700 bis 8001 C, über Eisen(111)-oxyd geleitet werden. Dabei wird das Arsenchlorid quantitativ unter Bildung von Eisenarsenat und freiem Chlor zersetzt. Das Chlor steht, gegebenenfalls nach Abtrennung durch Adsorption oder Tiefkühlung, wieder für Chlorierungszwecke zur Verfügung. Das gebildete Eisenarsenat fällt, je nach Art des Eisenoxydeinsatzes, in pulvriger oder stückiger Form an. Es kann leicht transportiert und, da es physiologisch unbedenklich ist, auf Halde abgesetzt werden. Beispiel In einem Röhrenofen wurde eine 12 cm hohe Schicht von Eisen(III)-oxyd-Pellets auf 8001 C erhitzt. Durch diese Schicht wurde mit einer Gasgeschwindigkeit von 25 cm/n-iin, bezogen auf den freien Querschnitt, unter N T P Luft mit 12 Volumprozent As Cl. geleitet.A process for the dry processing of arsenic chloride or waste gases containing arsenic chloride, which avoids these disadvantages, is described below. It consists in the fact that the arsenic chloride-containing exhaust gases from the chlorination plant are mixed in a slight excess with the amount of oxygen required for the oxidation of arsenic chloride to arsenate in the form of oxygen, air or other oxygen-containing gases and the gases at temperatures between 500 and 9001 C, preferably 700 up to 8001 C, via iron (111) oxide. The arsenic chloride is quantitatively decomposed with the formation of iron arsenate and free chlorine. The chlorine is available again for chlorination purposes, if necessary after being separated off by adsorption or deep-freezing. The iron arsenate formed is obtained in powder or lump form, depending on the type of iron oxide used. It can be easily transported and, since it is physiologically harmless, it can be dumped. Example A 12 cm high layer of iron (III) oxide pellets was heated to 800 ° C. in a tube furnace. Through this layer, at a gas velocity of 25 cm / n-iin, based on the free cross-section, air with 12 percent by volume As Cl was passed under N TP. directed.
Das austretende Gas enthielt 20 Volumprozent Cl, und 3,3 Volumprozent 0." Rest N 2, Arsen war im Abgas erst nachweisbar, nachdem rund 251/o der stöchiometrischen Arsenmenge, bezogen auf 3Fe.,0,1."As,0 angebotenwar.The exiting gas contained 20 percent by volume Cl and 3.3 percent by volume 0. "The remainder of N 2, arsenic was only detectable in the exhaust gas after around 251 / o of the stoichiometric amount of arsenic, based on 3Fe., 0.1" As, 0 had been offered .
'59 C'59 C
Claims (2)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE625878D BE625878A (en) | 1962-03-15 | ||
DED38360A DE1135665B (en) | 1962-03-15 | 1962-03-15 | Process for the recovery of chlorine from waste gases containing arsenic chloride |
FR923251A FR1346120A (en) | 1962-03-15 | 1963-01-31 | Process for recovering chlorine from waste gases containing arsenic chloride |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED38360A DE1135665B (en) | 1962-03-15 | 1962-03-15 | Process for the recovery of chlorine from waste gases containing arsenic chloride |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1135665B true DE1135665B (en) | 1962-08-30 |
Family
ID=7044063
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DED38360A Pending DE1135665B (en) | 1962-03-15 | 1962-03-15 | Process for the recovery of chlorine from waste gases containing arsenic chloride |
Country Status (2)
Country | Link |
---|---|
BE (1) | BE625878A (en) |
DE (1) | DE1135665B (en) |
-
0
- BE BE625878D patent/BE625878A/xx unknown
-
1962
- 1962-03-15 DE DED38360A patent/DE1135665B/en active Pending
Also Published As
Publication number | Publication date |
---|---|
BE625878A (en) | 1963-04-01 |
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