DE544195C - Manufacture of metal arsenates - Google Patents

Manufacture of metal arsenates

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Publication number
DE544195C
DE544195C DE1930544195D DE544195DD DE544195C DE 544195 C DE544195 C DE 544195C DE 1930544195 D DE1930544195 D DE 1930544195D DE 544195D D DE544195D D DE 544195DD DE 544195 C DE544195 C DE 544195C
Authority
DE
Germany
Prior art keywords
arsenic
arsenates
oxidation
manufacture
metal
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
DE1930544195D
Other languages
German (de)
Inventor
Dr-Ing Georg Guenther Reissaus
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.)
OMG Borchers GmbH
Original Assignee
Borchers GmbH
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 Borchers GmbH filed Critical Borchers GmbH
Application granted granted Critical
Publication of DE544195C publication Critical patent/DE544195C/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G28/00—Compounds of arsenic
    • C01G28/02—Arsenates; Arsenites
    • C01G28/023—Arsenates; Arsenites of ammonium, alkali or alkaline-earth metals or magnesium
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/60—Optical properties, e.g. expressed in CIELAB-values

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Compounds Of Heavy Metals (AREA)

Description

Herstellung von metallarsenaten Es ist bekannt, Natriumarsenat dadurch herzustellen, daß man Speisen oder andere arsenhaltige Materialien mit einem überschuß von Soda erhitzt. Ferner werden Arsenate, insbesondere Calciumarsenate, durch Erwärmen der entsprechenden Arsenfite unter Zutritt von Luft oder Sauerstoff gewonnen. Hierbei kann infolge der Möglichkeit, daß Arsenfite sich beim Erhitzen unter Arsenabspaltung in Arsenate umwandeln, metallisches Arsen entstehen. Eine mit der Herstellung von Arsenaten verbundene Gewinnung von metallischem Arsen ist bisher nicht versucht worden.Manufacture of metal arsenates It is known to make sodium arsenate thereby prepare food or other arsenic-containing materials with an excess heated by soda. Furthermore, arsenates, especially calcium arsenates, are removed by heating of the corresponding arsenic fines obtained with exposure to air or oxygen. Here can be due to the possibility that arsenic fites form with elimination of arsenic when heated convert into arsenates, metallic arsenic is formed. One with the production of Production of metallic arsenic linked to arsenates has not yet been attempted been.

Die Herstellung z. B. von Natriumarsenat nach dem oben geschilderten Verfahren ist unwirtschaftlich, da die Ausbeuten zu gering sind. Nach einem bekannten Verfahren verwendet man Salpeter als Zusatz bei der Herstellung von Natriumarsenat aus Arsenik und Soda, welches Verfahren bisher das einzige brauchbare Verfahren auf trockenem Wege zur Herstellung von Natriumarsenat war.The production z. B. of sodium arsenate according to the above The process is uneconomical because the yields are too low. According to a well-known Process one uses saltpeter as an additive in the production of sodium arsenate from arsenic and soda, which process has so far been the only usable process was on the dry route to make sodium arsenate.

Die vorliegende Erfindung beruht darauf, daß man, statt mit Soda, mit Arsenik im Überschuß arbeitet; hierbei benutzt man also den im Arsenik enthaltenen Sauerstoff als Oxvdationsrnittel. Dieser in statu nascendi wirkende Sauerstoff ermöglicht eine quantitative Ausbeute an Natriumarsenat, was ohne weiteres nicht zu erwarten war. Gemäß der Gleichung 9 Na= C03 + 5 As. 0.The present invention is based on the fact that, instead of using soda, works with excess arsenic; in this case the one contained in the arsenic is used Oxygen as an oxidizing agent. This enables oxygen, which acts in statu nascendi a quantitative yield of sodium arsenate, which is not to be expected without further ado was. According to equation 9 Na = C03 + 5 As. 0.

- 6 Na. As O, -i- ,4 As 4- 9 CO= findet eine gleichzeitige Bildung von metallischem Arsen statt, das dampfförmig abgeführt und als Arsenmetall gewonnen werden kann.- 6 Well. As O, -i-, 4 As 4- 9 CO = takes place at the same time instead of metallic arsenic, which is removed in vapor form and obtained as arsenic metal can be.

Das Orthosalz des arsensauren Calciums wird zweckmäßig durch Luftoxydation von Calciumarsenit hergestellt. Hier würde eine Oxydation durch überschüssige arsenige Säure keinen Vorteil bieten. Will man dagegen die sauren Calciumarsenate (Pyro-und Metaarsenat) herstellen, so wird der Weg der Oxydation in Gegenwart überschüssiger arseniger Säure mit Vorteil beschritten.The orthosalt of calcium arsenic is expediently oxidized by air made of calcium arsenite. This would lead to oxidation from excess arsenic Acid does not provide any benefit. If, on the other hand, you want to use the acidic calcium arsenates (pyro and Metaarsenate), the way of oxidation becomes more excessive in the presence Arsenic acid trodden with advantage.

Die Oxydation von Bleiarsenit mit Luft oder Sauerstoff zu Bleiarsenat gelingt nicht, da bei .der hierzu nötigen Temperatur Schmelzung eintritt, wodurch die Einwirkung der Luft aufhört. Hier ist die Oxydation durch Zusatz genau äquivalenter Mengen Arsenik zur Bildung eines Bleiarsenates der allein brauchbare Weg.The oxidation of lead arsenite with air or oxygen to lead arsenate does not succeed, since melting occurs at the temperature required for this, as a result of which exposure to air ceases. Here the oxidation by addition is exactly equivalent Amounts of arsenic to form a lead arsenate is the only useful way.

Beispiele i. 954 kg wasserfreie Soda werden mit 99o kg Arsenik gut gemischt und bei Luftabschluß, z. B. in einer mit Abzug versehenen Muffel, -.auf `5oo bis 55o° erhitzt. Das erhaltene NTatriumarsenat enthält weniger als o,2°/, As.,03 und' 55°0 As=OE. Das entstehende metallische Arsen entweicht und wird in gekühlten Vorlagen kondensiert.Examples i. 954 kg of anhydrous soda are fine with 99o kg of arsenic mixed and with exclusion of air, z. B. in a deduction Muffle, -.heated to `500 to 55o °. The obtained N sodium arsenate contains less as o, 2 ° /, As., 03 and '55 ° 0 As = OE. The resulting metallic arsenic escapes and is condensed in cooled templates.

a. Gemäß der Formel 6 Ca0 + 5 As=O. - 3 Ca.As.07 -E- 4. As werden 336 kg Ätzkalk mit ggo kg Arsenik in einem Ofen erhitzt unter Vermeidung von Luftzutritt. Es bildet sich Calciumpyroarsenat.a. According to the formula 6 Ca0 + 5 As = O. - 3 Ca.As.07 -E- become 4th As 336 kg quicklime with about 6 kg arsenic heated in an oven avoiding the entry of air. Calcium pyroarsenate is formed.

3. Zur Herstellung von Bleiarsenat werden 3oo kg Bleiarsenat mit ¢6 kg Arsenik trocken gemischt und auf 300° erhitzt. Die weiße Masse färbt sich zunächst schwarz, bis sie allmählich rein gelb wird (Farbe des Bleiarsenats bei 300°). Das Erhitzen wird so lange fortgesetzt, bis die Masse arsenikfrei geworden ist.3. To produce lead arsenate, 300 kg of lead arsenate are mixed with ¢ 6 kg of arsenic mixed dry and heated to 300 °. The white mass is initially colored black until it gradually becomes pure yellow (color of lead arsenate at 300 °). That Heating is continued until the mass has become arsenic-free.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Metallarsenaten bzw. Metallpy roarsenaten durch Oxydation von Arseniten oder von Gemischen von Metallbasen und arseniger Säure unter Erwärmung, dadurch gekennzeichnet, daß so viel überschüssiges Arsenik in die betreffenden Reaktionsmassen eingebracht wird, daß dessen Sauerstoff zur Oxydation des dreiwertigen Arsens ausreicht, und daß das gleichzeitig gebildete Arsen durch Sublimation abgeschieden wird.PATENT CLAIM: Process for the production of metal arsenates or Metallpyroarsenates by oxidation of arsenites or mixtures of metal bases and arsenic acid under heating, characterized in that so much excess Arsenic is introduced into the relevant reaction masses that its oxygen is sufficient for the oxidation of the trivalent arsenic, and that that which is formed at the same time Arsenic is deposited by sublimation.
DE1930544195D 1930-08-24 1930-08-24 Manufacture of metal arsenates Expired DE544195C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE544195T 1930-08-24

Publications (1)

Publication Number Publication Date
DE544195C true DE544195C (en) 1932-02-15

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ID=6560326

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1930544195D Expired DE544195C (en) 1930-08-24 1930-08-24 Manufacture of metal arsenates

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DE (1) DE544195C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404948A (en) * 1965-04-27 1968-10-08 Sherwin Williams Co Process for making sodium arsenate

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3404948A (en) * 1965-04-27 1968-10-08 Sherwin Williams Co Process for making sodium arsenate

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