GB517998A - Improvements in or relating to process of pickling iron and its alloy - Google Patents
Improvements in or relating to process of pickling iron and its alloyInfo
- Publication number
- GB517998A GB517998A GB24581/38A GB2458138A GB517998A GB 517998 A GB517998 A GB 517998A GB 24581/38 A GB24581/38 A GB 24581/38A GB 2458138 A GB2458138 A GB 2458138A GB 517998 A GB517998 A GB 517998A
- Authority
- GB
- United Kingdom
- Prior art keywords
- limiter
- aug
- ferrous sulphate
- solution
- ferrous
- 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
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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/081—Iron or steel solutions containing H2SO4
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Compounds Of Iron (AREA)
Abstract
517,998. Pickling metals. LATTRE, P. DE. Aug. 20, 1938, Nos. 24581 and 24582. Convention dates, Aug. 21, 1937 and Aug. 6, 1938. [Class 82 (ii)] Iron and its alloys are pickled by means of a sulphuric acid solution to which are added hydrochloric acid and a limiter, the porportions of the reagents being such as to cause the formation of ferrous chloride at the expense of ferrous sulphate. The pickling solution is regenerated by simultaneous additions of the two acids and the limiter in such amounts as to maintain substantially constant the concentrations of these three constituents and to keep up the partial conversion of ferrous sulphate into ferrous chloride. Used-up pickling solution may be rendered suitable for re-use by subjecting it to fractional crystallisation, separating the precipitated ferrous sulphate and recovering mother liquor and adding to said liquor an amount of water substantially equal in volume to the amount of ferrous sulphate separated, thereby restoring an acid concentration once to twice normal in H2SO4 and one to three times normal in Cl ion. The limiter may be added in the form of a hydrochloric solution of peptonized gelatine, or of a tertiary heterocyclic base such as quinoline, naphthoquinoline, or a homologous hydrochloride.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE517998X | 1937-08-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB517998A true GB517998A (en) | 1940-02-14 |
Family
ID=3871263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24581/38A Expired GB517998A (en) | 1937-08-21 | 1938-08-20 | Improvements in or relating to process of pickling iron and its alloy |
Country Status (3)
| Country | Link |
|---|---|
| BE (2) | BE429590A (en) |
| DE (1) | DE708303C (en) |
| GB (1) | GB517998A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0543729A1 (en) * | 1991-11-20 | 1993-05-26 | Sollac | Pickling process for mild steel and bath for pickling |
| US7537749B2 (en) | 2003-10-06 | 2009-05-26 | Tronox Pigments Gmbh | Method for processing iron-laden spent sulfuric acid |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE934859C (en) * | 1951-06-02 | 1955-11-03 | Metallgesellschaft Ag | Pickling process for the pretreatment of surfaces of stainless steels |
| DE1012138B (en) * | 1953-02-16 | 1957-07-11 | Ruthner Othmar | Process and device for the pickling of metals, especially iron and steel, with simultaneous recovery of the pickling acid |
-
0
- BE BE423246D patent/BE423246A/xx unknown
- BE BE429590D patent/BE429590A/xx unknown
-
1937
- 1937-10-27 DE DEL93525D patent/DE708303C/en not_active Expired
-
1938
- 1938-08-20 GB GB24581/38A patent/GB517998A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0543729A1 (en) * | 1991-11-20 | 1993-05-26 | Sollac | Pickling process for mild steel and bath for pickling |
| US7537749B2 (en) | 2003-10-06 | 2009-05-26 | Tronox Pigments Gmbh | Method for processing iron-laden spent sulfuric acid |
Also Published As
| Publication number | Publication date |
|---|---|
| DE708303C (en) | 1941-07-17 |
| BE423246A (en) | |
| BE429590A (en) |
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