GB1432110A - Process for the defluorination of waste gypsum from the phos phonic acid process - Google Patents
Process for the defluorination of waste gypsum from the phos phonic acid processInfo
- Publication number
- GB1432110A GB1432110A GB3154374A GB3154374A GB1432110A GB 1432110 A GB1432110 A GB 1432110A GB 3154374 A GB3154374 A GB 3154374A GB 3154374 A GB3154374 A GB 3154374A GB 1432110 A GB1432110 A GB 1432110A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gypsum
- fluorine compounds
- sulphuric acid
- waste gypsum
- defluorination
- 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
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
- C01F11/468—Purification of calcium sulfates
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Treating Waste Gases (AREA)
Abstract
1432110 Gypsum CHEMIE LINZ AG 16 July 1974 [24 July 1973] 31543/74 Heading C1A Waste gypsum from the production of phosphoric acid is defluorinated by means of sulphuric acid at an elevated temperature by dehydrating the waste gypsum by calcination prior to adding the sulphuric acid and subsequently mixing the substantially anhydrous calcined gypsum while it is still hot with an amount of concentrated sulphuric acid sufficient to decompose the solid fluorine compounds contained and to expel the volatile fluorine compounds formed. The dehydration may be carried out by heating the gypsum to not more than 500‹ C. or may be carried out in two stages, the gypsum being heated to not more than 250‹ C. in the first stage, until the semi-hydrate stage is reached. The volatile fluorine compounds obtained include HF and SiF 4 .
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19732337608 DE2337608C3 (en) | 1973-07-24 | Process for the defluorination of phosphoric acid waste gypsum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1432110A true GB1432110A (en) | 1976-04-14 |
Family
ID=5887861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3154374A Expired GB1432110A (en) | 1973-07-24 | 1974-07-16 | Process for the defluorination of waste gypsum from the phos phonic acid process |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS5050291A (en) |
| BE (1) | BE818062A (en) |
| BR (1) | BR7406106D0 (en) |
| GB (1) | GB1432110A (en) |
| NL (1) | NL7409988A (en) |
| ZA (1) | ZA744650B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020100260A1 (en) * | 2020-01-08 | 2021-07-08 | Thyssenkrupp Ag | Integrated process for the production of sulfuric acid process-suitable sulfur dioxide quality from calcium sulfate / phosphogypsum from phosphoric acid production |
-
1974
- 1974-07-16 GB GB3154374A patent/GB1432110A/en not_active Expired
- 1974-07-19 ZA ZA00744650A patent/ZA744650B/en unknown
- 1974-07-24 BR BR6106/74A patent/BR7406106D0/en unknown
- 1974-07-24 BE BE146920A patent/BE818062A/en unknown
- 1974-07-24 NL NL7409988A patent/NL7409988A/en unknown
- 1974-07-24 JP JP49084257A patent/JPS5050291A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| BR7406106D0 (en) | 1975-05-13 |
| ZA744650B (en) | 1975-08-27 |
| BE818062A (en) | 1975-01-24 |
| JPS5050291A (en) | 1975-05-06 |
| NL7409988A (en) | 1975-01-28 |
| DE2337608A1 (en) | 1975-03-06 |
| DE2337608B2 (en) | 1975-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |