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DE840374C - Separation of chromic acid from water, especially from waste water chromating plants - Google Patents

Separation of chromic acid from water, especially from waste water chromating plants

Info

Publication number
DE840374C
DE840374C DESCH3662A DESC003662A DE840374C DE 840374 C DE840374 C DE 840374C DE SCH3662 A DESCH3662 A DE SCH3662A DE SC003662 A DESC003662 A DE SC003662A DE 840374 C DE840374 C DE 840374C
Authority
DE
Germany
Prior art keywords
water
chromic acid
separation
chromating
plants
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
DESCH3662A
Other languages
German (de)
Inventor
Alfons Dipl-Chem D Schwittmann
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.)
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 DESCH3662A priority Critical patent/DE840374C/en
Application granted granted Critical
Publication of DE840374C publication Critical patent/DE840374C/en
Expired legal-status Critical Current

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
    • C02F1/70—Treatment of water, waste water, or sewage by reduction
    • C02F1/705—Reduction by metals
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G37/00—Compounds of chromium
    • C01G37/14—Chromates; Bichromates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/22—Chromium or chromium compounds, e.g. chromates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Inorganic Chemistry (AREA)
  • Removal Of Specific Substances (AREA)

Description

Abscheidung von Chromsäure aus Wasser, besonders aus Abwasser verchromender Betriebe Es ist bekannt, daß man gelöste Chromsäure durch Reduktion in unlösliche Chromichrom.ate überführen kann. Als metallfreie Reduktionsmittel können Schwefelwasserstoff oder Wasserstoff im statu nascendi benutzt werden. Der Wasserstoff im statu nascendi kann in diesem Fall nicht durch Eimvirkung der Säure auf gewöhnliches Eisen erhalten werden. Durch Berührung mit der Chromsäure wird das gewöhnliche schmiedbare Eisen nämlich an der Oberfläche passiviert und löst sich dann nur schwer in Säuren unter Wasserstoffentvvicklttiig.Separation of chromic acid from water, especially from chrome-plating waste water Establishments It is known that dissolved chromic acid can be converted into insoluble ones by reduction Chromichrom.ate can transfer. Hydrogen sulfide can be used as a metal-free reducing agent or hydrogen can be used in statu nascendi. The hydrogen in the statu nascendi in this case cannot be obtained by the action of the acid on common iron will. In contact with chromic acid, common iron becomes malleable namely passivated on the surface and then dissolves only with difficulty in acids Hydrogen Evolving.

Es wurde nun gefunden, daß bei Anwesenheit großer Mengen Kohlenstoffs im Eisen die Auflösungsgeschwindigkeit in chromsaurem Wasser nicht oder nur wenig gehemmt wird. Der entstehende Wasserstoff reduziert einen Teil der Chromsäure zu Chromioxyd, und dieses bildet mit weiterer Chromsäure basische Verbindungen vom Typus Cr03 # Cr203. Das aufgelöste Eisen fällt in ähnlicher Weise als basisches Ferrichromat.It has now been found that in the presence of large amounts of carbon in iron the rate of dissolution in chromic acid water is little or no is inhibited. The resulting hydrogen reduces part of the chromic acid Chromium dioxide, and this forms basic compounds with other chromic acid Type Cr03 # Cr203. The dissolved iron falls in a similar way as basic Ferric chromate.

Bei der technischen Durchführung des Verfahrens wird das chromsäurehaltige Wasser in langsamem Strom durch ein Filter aus Guß- oder Roheisenspänen geleitet.In the technical implementation of the process, the chromic acid-containing Water passed in a slow stream through a filter made of cast iron or pig iron filings.

Claims (1)

PATENTANSPRUCH: Absehe idung von Chromsäure aus Wasser, dadurch gekennzeichnet, daß das zu reinigende Wasser in langsamem Strom durch ein Filter auß Guß- oder Roheisen geleitet wird.PATENT CLAIM: Separation of chromic acid from water, characterized in that that the water to be cleaned flows slowly through a filter made of cast iron or pig iron is directed.
DESCH3662A 1950-08-17 1950-08-17 Separation of chromic acid from water, especially from waste water chromating plants Expired DE840374C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DESCH3662A DE840374C (en) 1950-08-17 1950-08-17 Separation of chromic acid from water, especially from waste water chromating plants

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESCH3662A DE840374C (en) 1950-08-17 1950-08-17 Separation of chromic acid from water, especially from waste water chromating plants

Publications (1)

Publication Number Publication Date
DE840374C true DE840374C (en) 1952-06-03

Family

ID=7423861

Family Applications (1)

Application Number Title Priority Date Filing Date
DESCH3662A Expired DE840374C (en) 1950-08-17 1950-08-17 Separation of chromic acid from water, especially from waste water chromating plants

Country Status (1)

Country Link
DE (1) DE840374C (en)

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