GB1462750A - Method for the elimination of chrome and zinc from ex - Google Patents

Method for the elimination of chrome and zinc from ex

Info

Publication number
GB1462750A
GB1462750A GB1162575A GB1162575A GB1462750A GB 1462750 A GB1462750 A GB 1462750A GB 1162575 A GB1162575 A GB 1162575A GB 1162575 A GB1162575 A GB 1162575A GB 1462750 A GB1462750 A GB 1462750A
Authority
GB
United Kingdom
Prior art keywords
chrome
elimination
zinc
march
solution
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
GB1162575A
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
Publication of GB1462750A publication Critical patent/GB1462750A/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
    • 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
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/18—Cyanides
    • 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
    • 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

  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

1462750 Removal of Cr and Zn INTERNATIONAL STANDARD ELECTRIC CORP 20 March 1975 [27 March 1974] 11625/75 Heading C1C A process for removing Cr and Zn from exhausted passivation baths comprises reducing Cr (VI) to Cr(III) with a reducing agent (e.g. Na or K bisulphite), agitating the solution with air whilst adjusting the pH to 9-10, adding a flocculating agent (e.g. a polyelectrolyte), and allowing the solution to settle to precipitate Cr and Zn.
GB1162575A 1974-03-27 1975-03-20 Method for the elimination of chrome and zinc from ex Expired GB1462750A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT4973574A IT1011167B (en) 1974-03-27 1974-03-27 MANUAL TREATMENT METHOD FOR TOTAL REDUCTION OF CHROME AND ZINC FROM EXHAUSTED PASSIVATION BATHS

Publications (1)

Publication Number Publication Date
GB1462750A true GB1462750A (en) 1977-01-26

Family

ID=11271450

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1162575A Expired GB1462750A (en) 1974-03-27 1975-03-20 Method for the elimination of chrome and zinc from ex

Country Status (3)

Country Link
FR (1) FR2265692B3 (en)
GB (1) GB1462750A (en)
IT (1) IT1011167B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107935231B (en) * 2017-10-30 2021-07-16 昆明理工大学 Method and device for treating discharged liquid in mechanical galvanizing process

Also Published As

Publication number Publication date
FR2265692B3 (en) 1977-12-02
IT1011167B (en) 1977-01-20
FR2265692A1 (en) 1975-10-24

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee