JPS55161074A - Recovering method for waste chromate solution - Google Patents

Recovering method for waste chromate solution

Info

Publication number
JPS55161074A
JPS55161074A JP6895779A JP6895779A JPS55161074A JP S55161074 A JPS55161074 A JP S55161074A JP 6895779 A JP6895779 A JP 6895779A JP 6895779 A JP6895779 A JP 6895779A JP S55161074 A JPS55161074 A JP S55161074A
Authority
JP
Japan
Prior art keywords
soln
waste
chromate
hydroxide
zinc
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
Application number
JP6895779A
Other languages
Japanese (ja)
Inventor
Masayoshi Saito
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6895779A priority Critical patent/JPS55161074A/en
Publication of JPS55161074A publication Critical patent/JPS55161074A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/86—Regeneration of coating baths

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

PURPOSE:To recover waste chromate soln. by a simple method, by alkalizing waste chromate soln. to a prescribed pH so as to remove zinc hydroxide, then by acidulating the waste soln. to a prescribed pH. CONSTITUTION:To the waste soln. obtained from chromate soln. having been used for forming chromate coating on the surface of zinc-galvanized product are added one or more members of alkali metal hydroxide, for example, sodium hydroxide, potassium hydroxide etc. to increase its pH to 9-12. By this process, zin contained in the waste soln. is removed as hydroxide precipitate without decreasing the oxidizing power of the waste soln. To the waste soln. having been liberated from zinc hydroxide is added a strong mineral acid such as nitric acid, sulfuric acid etc to decrease its pH to 2 or lower. Reutilization of the chromate soln. hereby regenerated permits to form excellent chromate coating.
JP6895779A 1979-06-04 1979-06-04 Recovering method for waste chromate solution Pending JPS55161074A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6895779A JPS55161074A (en) 1979-06-04 1979-06-04 Recovering method for waste chromate solution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6895779A JPS55161074A (en) 1979-06-04 1979-06-04 Recovering method for waste chromate solution

Publications (1)

Publication Number Publication Date
JPS55161074A true JPS55161074A (en) 1980-12-15

Family

ID=13388654

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6895779A Pending JPS55161074A (en) 1979-06-04 1979-06-04 Recovering method for waste chromate solution

Country Status (1)

Country Link
JP (1) JPS55161074A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2669323A1 (en) * 1990-11-16 1992-05-22 Isochrome PROCESS FOR PURIFYING AQUEOUS USED SOLUTIONS OF CHROMIC ACID AND SOLUTIONS THUS PURIFIED.
WO2013168799A1 (en) * 2012-05-10 2013-11-14 ディップソール株式会社 Method for regenerating solution for nitric acid activation treatment of zinc-plated metal member surface, and regeneration treatment apparatus using same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2669323A1 (en) * 1990-11-16 1992-05-22 Isochrome PROCESS FOR PURIFYING AQUEOUS USED SOLUTIONS OF CHROMIC ACID AND SOLUTIONS THUS PURIFIED.
WO1992008825A1 (en) * 1990-11-16 1992-05-29 Isochrome Method for purifying concentrated, aqueous and used solutions of chromic acid, and solutions thereby purified
WO2013168799A1 (en) * 2012-05-10 2013-11-14 ディップソール株式会社 Method for regenerating solution for nitric acid activation treatment of zinc-plated metal member surface, and regeneration treatment apparatus using same
JP2013234371A (en) * 2012-05-10 2013-11-21 Dipsol Chemicals Co Ltd Regeneration method of nitric acid activation treatment solution for zinc plating metal member surface, and regeneration apparatus using the same
CN104321466A (en) * 2012-05-10 2015-01-28 迪普索尔化学株式会社 Method for regenerating solution for nitric acid activation treatment of zinc-plated metal member surface, and regeneration treatment apparatus using same
US9249509B2 (en) 2012-05-10 2016-02-02 Dipsol Chemicals Co., Ltd. Method for regenerating solution for nitric acid activation treatment of zinc-plated metal member surface, and regeneration treatment apparatus using the same

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