GB631525A - An improved method of and means for the purification and revivification of acid pickling liquors for iron and steel products - Google Patents
An improved method of and means for the purification and revivification of acid pickling liquors for iron and steel productsInfo
- Publication number
- GB631525A GB631525A GB1405846A GB1405846A GB631525A GB 631525 A GB631525 A GB 631525A GB 1405846 A GB1405846 A GB 1405846A GB 1405846 A GB1405846 A GB 1405846A GB 631525 A GB631525 A GB 631525A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquor
- separator
- column
- tank
- jacket
- 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
- C23G1/36—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
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
<PICT:0631525/III/1> Iron and steel pickling liquor is continuously purified and revivified by causing the hot liquor with suspended crystalline matter to pass up a barometric column 2 having a cooling jacket 13 at a velocity exceeding that of the descent of the ferrous sulphate crystals in the liquor, the overflow being further cooled by evaporation under high vacuum applied at 6. The vapours evolved are condensed by sulphuric acid sprayed in at 7, the diluted acid from condenser 5 passing down leg 8 to the tank 1. The liquor in tank 1 may be at 50-70 DEG C., and it may be necessary to cool it to 25 DEG C. on entering column 2. Ferrous sulphate crystals entrained or formed on cooling in column 2 overflow with liquor into a conical separator 10 whence they descend the leg 17 to a conical sump 18. An airlift 21 transfers the sludge to a separator, e.g. centrifuge 23. The cooling jacket 13 is supplied with acid overflowing from the separator 10, filtrate pumped at 26 from the separator 23 and cold water at 29. A separate water-cooled jacket portion is, however, preferably fitted. The column 2, the jacket 13 and the legs 8 and 17 have heights to correspond to the gravities of the liquids they hold. A degree of vacuum of 29 inches of mercury is employed. A modification is shown wherein two columns 2 discharge into a common tank 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1405846A GB631525A (en) | 1946-05-09 | 1946-05-09 | An improved method of and means for the purification and revivification of acid pickling liquors for iron and steel products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1405846A GB631525A (en) | 1946-05-09 | 1946-05-09 | An improved method of and means for the purification and revivification of acid pickling liquors for iron and steel products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB631525A true GB631525A (en) | 1949-11-04 |
Family
ID=10034229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1405846A Expired GB631525A (en) | 1946-05-09 | 1946-05-09 | An improved method of and means for the purification and revivification of acid pickling liquors for iron and steel products |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB631525A (en) |
-
1946
- 1946-05-09 GB GB1405846A patent/GB631525A/en not_active Expired
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