IE38376B1 - Improvements in or relating to the production of plaster - Google Patents
Improvements in or relating to the production of plasterInfo
- Publication number
- IE38376B1 IE38376B1 IE1825/73A IE182573A IE38376B1 IE 38376 B1 IE38376 B1 IE 38376B1 IE 1825/73 A IE1825/73 A IE 1825/73A IE 182573 A IE182573 A IE 182573A IE 38376 B1 IE38376 B1 IE 38376B1
- Authority
- IE
- Ireland
- Prior art keywords
- seconds
- stage
- air
- plaster
- caso
- Prior art date
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
- C01F11/466—Conversion of one form of calcium sulfate to another
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/02—Methods and apparatus for dehydrating gypsum
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Drying Of Solid Materials (AREA)
Abstract
1429259 Plaster of Paris AIR INDUSTRIE and SOC CHIMIQUE DES CHARBONNAGES 10 Oct 1973 [12 Oct 1972] 47418/73 Heading C1A Plaster of Paris is prepared from previously washed and dried phospho-gypsum (CaSO 4 . 2H 2 O formed as a by-product during the manufacture of phosphoric acid from phosphate rocks) by (1) dehydrating in a current of hot inert gas to a product containing at least 25% anhydride III and (2) contacting with a current of moist air to convert all the anhydride III into # CaSO 4À ¢H 2 O. Stage 1 may take 0À8-3 seconds in air at an inlet temperature of 260- 350 C. and containing 20-500 grams of water per kilogram of dry air, stage 2 may be 0À8-3 seconds at 350-450 C. Or, stage 1 may be 0À8-3 seconds at 600-800 C. and 200-500 grams water per kilogram dry air and stage 2 0À8-3 seconds at 20-50 C. and 60-95% R.H. The process may be carried out in tubular pneumatic driers.
[GB1429259A]
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7236170A FR2202851B1 (en) | 1972-10-12 | 1972-10-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE38376L IE38376L (en) | 1974-04-12 |
| IE38376B1 true IE38376B1 (en) | 1978-03-01 |
Family
ID=9105549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE1825/73A IE38376B1 (en) | 1972-10-12 | 1973-10-12 | Improvements in or relating to the production of plaster |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS4975496A (en) |
| BE (1) | BE805808A (en) |
| BR (1) | BR7307953D0 (en) |
| DE (1) | DE2350772A1 (en) |
| ES (1) | ES419558A1 (en) |
| FR (1) | FR2202851B1 (en) |
| GB (1) | GB1429259A (en) |
| IE (1) | IE38376B1 (en) |
| IL (1) | IL43439A (en) |
| IT (1) | IT999642B (en) |
| LU (1) | LU68591A1 (en) |
| NL (1) | NL7314064A (en) |
| OA (1) | OA04674A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2140702A (en) * | 1980-11-10 | 1984-12-05 | Bpb Industries Plc | Fluidised bed calcination |
| AU3354697A (en) * | 1997-07-15 | 1999-02-10 | Marceli Cyrkiewicz | Method and apparatus for the processing of phosphate gypsum waste |
| FR3059574A1 (en) * | 2016-12-07 | 2018-06-08 | Ocp Sa | PHOSPHOGYPSE EVACUATION SYSTEM |
| CN112811837B (en) * | 2020-12-31 | 2023-06-16 | 湖北聚海环境科技有限公司 | System equipment and method for dehydrating and drying phosphogypsum by using high-temperature waste heat of regenerated aggregate |
| CN113772979A (en) * | 2021-09-15 | 2021-12-10 | 贵州中建建筑科研设计院有限公司 | Reference phosphorus building gypsum and manufacturing method and application thereof |
-
1972
- 1972-10-12 FR FR7236170A patent/FR2202851B1/fr not_active Expired
-
1973
- 1973-10-09 OA OA55030A patent/OA04674A/en unknown
- 1973-10-09 BE BE2053133A patent/BE805808A/en not_active IP Right Cessation
- 1973-10-10 GB GB4741873A patent/GB1429259A/en not_active Expired
- 1973-10-10 LU LU68591A patent/LU68591A1/xx unknown
- 1973-10-10 DE DE19732350772 patent/DE2350772A1/en active Pending
- 1973-10-11 BR BR7953/73A patent/BR7307953D0/en unknown
- 1973-10-11 IT IT70002/73A patent/IT999642B/en active
- 1973-10-11 ES ES419558A patent/ES419558A1/en not_active Expired
- 1973-10-12 JP JP48115256A patent/JPS4975496A/ja active Pending
- 1973-10-12 IE IE1825/73A patent/IE38376B1/en unknown
- 1973-10-12 NL NL7314064A patent/NL7314064A/xx not_active Application Discontinuation
- 1973-10-17 IL IL43439A patent/IL43439A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES419558A1 (en) | 1976-07-16 |
| OA04674A (en) | 1980-07-31 |
| IL43439A (en) | 1976-08-31 |
| FR2202851A1 (en) | 1974-05-10 |
| DE2350772A1 (en) | 1974-04-18 |
| GB1429259A (en) | 1976-03-24 |
| BE805808A (en) | 1974-02-01 |
| FR2202851B1 (en) | 1978-12-29 |
| LU68591A1 (en) | 1973-12-14 |
| JPS4975496A (en) | 1974-07-22 |
| NL7314064A (en) | 1974-04-16 |
| IE38376L (en) | 1974-04-12 |
| IL43439A0 (en) | 1974-03-14 |
| IT999642B (en) | 1976-03-10 |
| BR7307953D0 (en) | 1974-07-25 |
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