GB365981A - Improved method of purifying hot spent pickle liquors from steel mills, and the like - Google Patents
Improved method of purifying hot spent pickle liquors from steel mills, and the likeInfo
- Publication number
- GB365981A GB365981A GB2120031A GB2120031A GB365981A GB 365981 A GB365981 A GB 365981A GB 2120031 A GB2120031 A GB 2120031A GB 2120031 A GB2120031 A GB 2120031A GB 365981 A GB365981 A GB 365981A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sulphate
- ferrous
- liquor
- neutralize
- hydroxide
- 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
- 235000021110 pickles Nutrition 0.000 title abstract 3
- 229910000831 Steel Inorganic materials 0.000 title abstract 2
- 239000010959 steel Substances 0.000 title abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 4
- 235000003891 ferrous sulphate Nutrition 0.000 abstract 4
- 239000011790 ferrous sulphate Substances 0.000 abstract 4
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 abstract 4
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 abstract 4
- 239000001117 sulphuric acid Substances 0.000 abstract 4
- 235000011149 sulphuric acid Nutrition 0.000 abstract 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract 2
- 239000002253 acid Substances 0.000 abstract 2
- 229910052791 calcium Inorganic materials 0.000 abstract 2
- 239000011575 calcium Substances 0.000 abstract 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract 2
- 229960004887 ferric hydroxide Drugs 0.000 abstract 2
- 230000007062 hydrolysis Effects 0.000 abstract 2
- 238000006460 hydrolysis reaction Methods 0.000 abstract 2
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 abstract 2
- 238000007254 oxidation reaction Methods 0.000 abstract 2
- 230000001590 oxidative effect Effects 0.000 abstract 2
- 239000010802 sludge Substances 0.000 abstract 2
- 229910021653 sulphate ion Inorganic materials 0.000 abstract 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract 1
- -1 alkaline-earth metal carbonate Chemical class 0.000 abstract 1
- 239000001175 calcium sulphate Substances 0.000 abstract 1
- 235000011132 calcium sulphate Nutrition 0.000 abstract 1
- 235000017550 sodium carbonate Nutrition 0.000 abstract 1
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Compounds Of Iron (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Hot spent pickle liquor containing sulphuric acid and ferrous sulphate has incorporated therein sufficient alkaline-earth metal carbonate to provide an excess of 15-20 per cent over that theoretically required to neutralize the entire free acid content of the liquor and the liquor then agitated until its pH value is between 6,0 and 7,0; the hydrolysis of the ferrous sulphate present is then rendered continuous and complete by having present sufficient carbonate to neutralize the sulphuric acid formed thereby and oxidizing the ferrous hydroxide to ferric hydroxide. The operation is preferably carried out in two stages with removal of the sludge of calcium or like sulphate formed in the first stage, and the oxidation of the ferrous hydroxide is effected by air preferably at temperatures of 100 DEG C. or higher and preferably also under pressure.ALSO:Hot spent pickle liquor from steel mills &c. is freed from sulphuric acid and ferrous sulphate by incorporating therein sufficient alkaline-earth carbonate to provide an excess of 15-20 per cent over that theoretically required to neutralize the entire free acid content of the liquor and then agitating until the pH value is between 6,0 and 7,0; the hydrolysis of the ferrous sulphate is then rendered continuous and complete by having present sufficient carbonate to neutralize the sulphuric acid formed thereby and oxidizing the ferrous hydroxide to ferric hydroxide. The operation is preferably carried out in two stages with removal of the sludge of calcium or like sulphate formed in the first stage, and the oxidation of the ferrous hydroxide is effected by air preferably at temperatures of 100 DEG C. or higher and preferably also under pressure. The purified effluent containing dissolved calcium sulphate may be softened by treatment with soda ash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2120031A GB365981A (en) | 1931-07-24 | 1931-07-24 | Improved method of purifying hot spent pickle liquors from steel mills, and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2120031A GB365981A (en) | 1931-07-24 | 1931-07-24 | Improved method of purifying hot spent pickle liquors from steel mills, and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB365981A true GB365981A (en) | 1932-01-28 |
Family
ID=10158864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2120031A Expired GB365981A (en) | 1931-07-24 | 1931-07-24 | Improved method of purifying hot spent pickle liquors from steel mills, and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB365981A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2440215A (en) * | 1946-03-21 | 1948-04-20 | Chemical Construction Corp | Treatment of iron sulfate liquors |
| US2771342A (en) * | 1953-12-02 | 1956-11-20 | American Cyanamid Co | Production of non-caking copperas |
| US5268159A (en) * | 1990-01-30 | 1993-12-07 | Bayer Aktiengesellschaft | Process for the production of storable, free-flowing hydrated ferrous sulfate |
-
1931
- 1931-07-24 GB GB2120031A patent/GB365981A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2440215A (en) * | 1946-03-21 | 1948-04-20 | Chemical Construction Corp | Treatment of iron sulfate liquors |
| US2771342A (en) * | 1953-12-02 | 1956-11-20 | American Cyanamid Co | Production of non-caking copperas |
| US5268159A (en) * | 1990-01-30 | 1993-12-07 | Bayer Aktiengesellschaft | Process for the production of storable, free-flowing hydrated ferrous sulfate |
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