JPS5477238A - Stainless steel pickling tretment free of environmental pollution - Google Patents

Stainless steel pickling tretment free of environmental pollution

Info

Publication number
JPS5477238A
JPS5477238A JP14435177A JP14435177A JPS5477238A JP S5477238 A JPS5477238 A JP S5477238A JP 14435177 A JP14435177 A JP 14435177A JP 14435177 A JP14435177 A JP 14435177A JP S5477238 A JPS5477238 A JP S5477238A
Authority
JP
Japan
Prior art keywords
wasted
stainless steel
pickling solution
hydrofluoric acid
acid
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.)
Granted
Application number
JP14435177A
Other languages
Japanese (ja)
Other versions
JPS5540672B2 (en
Inventor
Kinjiro Fujii
Motoshi Kaneko
Wakichi Kondo
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.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
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 Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP14435177A priority Critical patent/JPS5477238A/en
Publication of JPS5477238A publication Critical patent/JPS5477238A/en
Publication of JPS5540672B2 publication Critical patent/JPS5540672B2/ja
Granted 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/36—Regeneration of waste pickling liquors

Abstract

PURPOSE:Hydrogen fluoride is added to wasted pickling solution in an amount of specific ratio to dissolved Fe and Cr in waste liquid, thereby to effect simple and easy separation of such metals as oxides without consuming acid ingredient. CONSTITUTION:To a wasted pickling solution for stainless steel, hydrofluoric acid is added at a room-or elevated-temperature, in a molar ratio HF/M of 3 or higher, preferably 4-5, wherein M represents metallic ion in wasted liquid, such that M=(Fe<3+> + Cr<3+>). The HF addition, by synergetic action with nitric acid existed in wasted liquid, easily precipitates Fe and Cr ions as FeF3 3H2O and CrF3 3H2O. The precipitate is separated and washed, then thermally hydrolyzed into hydrofluoric acid and metal oxides. The mother liquor containing excess hydrofluoric acid and nitric acid is circulated for use as pickling solution.
JP14435177A 1977-12-01 1977-12-01 Stainless steel pickling tretment free of environmental pollution Granted JPS5477238A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14435177A JPS5477238A (en) 1977-12-01 1977-12-01 Stainless steel pickling tretment free of environmental pollution

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14435177A JPS5477238A (en) 1977-12-01 1977-12-01 Stainless steel pickling tretment free of environmental pollution

Publications (2)

Publication Number Publication Date
JPS5477238A true JPS5477238A (en) 1979-06-20
JPS5540672B2 JPS5540672B2 (en) 1980-10-20

Family

ID=15360075

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14435177A Granted JPS5477238A (en) 1977-12-01 1977-12-01 Stainless steel pickling tretment free of environmental pollution

Country Status (1)

Country Link
JP (1) JPS5477238A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104003490A (en) * 2014-05-19 2014-08-27 上海大学 Method for treating stainless steel acid pickling waste liquid and recovering metal with addition of [beta]-ferric fluoride trihydrate seed crystal

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104003490A (en) * 2014-05-19 2014-08-27 上海大学 Method for treating stainless steel acid pickling waste liquid and recovering metal with addition of [beta]-ferric fluoride trihydrate seed crystal

Also Published As

Publication number Publication date
JPS5540672B2 (en) 1980-10-20

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