GB1121809A - Process for pickling iron and steel and regenerating pickle liquor - Google Patents

Process for pickling iron and steel and regenerating pickle liquor

Info

Publication number
GB1121809A
GB1121809A GB504667A GB504667A GB1121809A GB 1121809 A GB1121809 A GB 1121809A GB 504667 A GB504667 A GB 504667A GB 504667 A GB504667 A GB 504667A GB 1121809 A GB1121809 A GB 1121809A
Authority
GB
United Kingdom
Prior art keywords
solution
ferrous sulphate
acid
replenished
returned
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
GB504667A
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.)
K S F CHEMICAL PROCESSES Ltd
Original Assignee
K S F CHEMICAL PROCESSES 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 K S F CHEMICAL PROCESSES Ltd filed Critical K S F CHEMICAL PROCESSES Ltd
Publication of GB1121809A publication Critical patent/GB1121809A/en
Expired 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
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/69—Sulfur trioxide; Sulfuric acid
    • C01B17/90—Separation; Purification
    • C01B17/901—Recovery from spent acids containing metallic ions, e.g. hydrolysis acids, pickling acids
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G49/00—Compounds of iron
    • C01G49/14—Sulfates

Abstract

Scale and rust are removed from iron and steel by pickling in an aqueous sulphuric acid solution which is replenished to keep the acid concentration between 8% and 20% by weight of sulphuric acid, heated to between 140 DEG F. and 180 DEG F., preferably by steam jets, and agitated by the discharge of compressed air. Ferrous sulphate is allowed to build up in the solution until Fe is between 8% and 12% of it by weight, then the solution is transferred to a crystallizer and cooled to below 140 DEG F. and preferably below 80 DEG F., so that the ferrous sulphate crystallizes as ferrous sulphate heptahydrate. When the solution has been freed of the crystals so formed it is replenished with fresh acid and returned to the pickling bath. Vapours from the pickling bath may be collected and acid recovered from them and returned to the bath.ALSO:Ferrous sulphate is allowed to build up in an aqueous sulphuric acid solution in which iron and stell are pickled until Fe is between 8% and 12% of it by weight, then the solution is transferred to a crystallizer and cooled to below 140 DEG F., and preferably below 80 DEG F., so that the ferrous sulphate crystallizes as ferrous sulphate heptahydrate. When the solution has been freed of the crystals so formed it is replenished and returned to the pickling bath. Vapours from the pickling bath may be collected and acid recovered from them and returned to the bath, which is replenished to keep the acid concentration between 8% and 20% by weight of sulphuric acid and is heated to between 140 DEG and 180 DEG F., preferably by steam jets, and is agitated by discharge of compressed air.
GB504667A 1966-02-26 1967-02-02 Process for pickling iron and steel and regenerating pickle liquor Expired GB1121809A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA953324 1966-02-26

Publications (1)

Publication Number Publication Date
GB1121809A true GB1121809A (en) 1968-07-31

Family

ID=4142463

Family Applications (1)

Application Number Title Priority Date Filing Date
GB504667A Expired GB1121809A (en) 1966-02-26 1967-02-02 Process for pickling iron and steel and regenerating pickle liquor

Country Status (9)

Country Link
JP (1) JPS5020009B1 (en)
BE (1) BE694575A (en)
DE (1) DE1621609A1 (en)
ES (1) ES337289A1 (en)
FI (1) FI45867C (en)
FR (1) FR1512134A (en)
GB (1) GB1121809A (en)
NO (1) NO118639B (en)
SE (1) SE315464B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225341A (en) * 1988-11-28 1990-05-30 Southwire Co Method of and apparatus for recovering and reusing organic pickling vapors
WO2002072918A1 (en) * 2001-03-09 2002-09-19 Metso Paper, Inc. Process and apparatus for pickling a metal piece after welding
CN110029352A (en) * 2018-03-08 2019-07-19 叶涛 A kind of environmentally friendly mordant and its application method of metallic article
CN112939271A (en) * 2021-01-29 2021-06-11 天津市华旺钢管制造有限公司 Washing liquid recycling device after strip steel pickling

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE8501990D0 (en) * 1985-04-24 1985-04-24 Pharmacia Ab BELEGGNINGSFORFARANDE
EP1609760A1 (en) * 2004-06-22 2005-12-28 Alexander Kehrmann Method for preparaing Iron(II) sulfate heptahydrate
CN114772611B (en) * 2022-03-18 2023-10-27 宣化钢铁集团有限责任公司 Production system and method for preparing ammonium sulfate from ammonia-containing gas

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2225341A (en) * 1988-11-28 1990-05-30 Southwire Co Method of and apparatus for recovering and reusing organic pickling vapors
GB2225341B (en) * 1988-11-28 1993-04-28 Southwire Co Method of and apparatus for recovering and reusing organic pickling vapors
WO2002072918A1 (en) * 2001-03-09 2002-09-19 Metso Paper, Inc. Process and apparatus for pickling a metal piece after welding
CN110029352A (en) * 2018-03-08 2019-07-19 叶涛 A kind of environmentally friendly mordant and its application method of metallic article
CN112939271A (en) * 2021-01-29 2021-06-11 天津市华旺钢管制造有限公司 Washing liquid recycling device after strip steel pickling

Also Published As

Publication number Publication date
FI45867B (en) 1972-06-30
NO118639B (en) 1970-01-19
ES337289A1 (en) 1968-02-01
FR1512134A (en) 1968-02-02
BE694575A (en) 1967-07-31
JPS5020009B1 (en) 1975-07-11
DE1621609A1 (en) 1971-05-27
FI45867C (en) 1972-10-10
SE315464B (en) 1969-09-29

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