GB887975A - Method of regenerating spent liquors produced in the pickling of iron or steel products - Google Patents
Method of regenerating spent liquors produced in the pickling of iron or steel productsInfo
- Publication number
- GB887975A GB887975A GB1899458A GB1899458A GB887975A GB 887975 A GB887975 A GB 887975A GB 1899458 A GB1899458 A GB 1899458A GB 1899458 A GB1899458 A GB 1899458A GB 887975 A GB887975 A GB 887975A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sodium sulphate
- solution
- pickling
- separated
- sulphate
- 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
- 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
- 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)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
Spent pickling liquors are regenerated and the iron values are recovered by cooling to -12 DEG to -16 DEG C., thereby crystallizing ferrous sulphate heptahydrate, which is separated. The ferrous sulphate may then be redissolved in water and precipitated with caustic alkali to produce iron oxide or hydroxide, which is separated, and a sodium sulphate solution. The latter is enriched with solid sodium sulphate produced in a subsequent stage and is then electrolised to produce caustic soda and a sulphuric acid solution of sodium sulphate. The caustic soda solution is recycled to the iron oxide precipitation step. The acidified sodium sulphate solution is cooled to -8 DEG C., thereby precipitating sodium sulphate, which is separated and recycled to enrich the sodium sulphate solution passing to electrolysis. The sulphuric acid solution remaining is combined with the initial regenerated pickling liquor from which the ferrous sulphate has been separated, and the mixed liquor is cooled to -15 DEG to -20 DEG C., whereupon 25 to 30% of the water content is removed as ice crystals, which are employed to cool the spent initial pickle liquor, or to dissolve the ferrous sulphate before precipitation with caustic soda. The final solution contains 20 parts by weight of sulphuric acid and may be employed for further pickling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1899458A GB887975A (en) | 1958-06-13 | 1958-06-13 | Method of regenerating spent liquors produced in the pickling of iron or steel products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1899458A GB887975A (en) | 1958-06-13 | 1958-06-13 | Method of regenerating spent liquors produced in the pickling of iron or steel products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB887975A true GB887975A (en) | 1962-01-24 |
Family
ID=10121968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1899458A Expired GB887975A (en) | 1958-06-13 | 1958-06-13 | Method of regenerating spent liquors produced in the pickling of iron or steel products |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB887975A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001049901A1 (en) * | 2000-01-05 | 2001-07-12 | United States Filter Corporation | Regenerating spent pickling liquor |
-
1958
- 1958-06-13 GB GB1899458A patent/GB887975A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001049901A1 (en) * | 2000-01-05 | 2001-07-12 | United States Filter Corporation | Regenerating spent pickling liquor |
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