IE40249B1 - Improvements in calcining calcium sulphate dihydrate - Google Patents
Improvements in calcining calcium sulphate dihydrateInfo
- Publication number
- IE40249B1 IE40249B1 IE2281/74A IE228174A IE40249B1 IE 40249 B1 IE40249 B1 IE 40249B1 IE 2281/74 A IE2281/74 A IE 2281/74A IE 228174 A IE228174 A IE 228174A IE 40249 B1 IE40249 B1 IE 40249B1
- Authority
- IE
- Ireland
- Prior art keywords
- tube
- calcination
- vessel
- hot gas
- cyclone
- Prior art date
Links
Classifications
-
- 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)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Baking, Grill, Roasting (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Noodles (AREA)
- Commercial Cooking Devices (AREA)
- Cookers (AREA)
Abstract
1488665 CaSO 4 .2H 2 O calcination; gypsum kettles BPB INDUSTRIES Ltd 31 Oct 1974 [27 Nov 1973] 54940/73 Heading ClA Calcium sulphate dihydrate is calcined by supplying heat to the calcination vessel, both indirectly through the external walls, and directly via the introduction of non-reactive hot gases into the interior of the calcining mass through a tube extending generally downwardly from the top of the vessel, which tube is provided with at least one opening in its lower part immersed in the calcining mass. The hot gas introduced into the sulphate charge is preferably generated by combustion of a fuel, A typical apparatus of the invention is shown in Fig. 3; tubes 29 and 31 respectively carry the dihydrate into, and the hemihydrate out of, the calcination vessel, hot gas being supplied via (4), and leaving via (33) which leads to a cyclone or other dust collection apparatus (not shown); the solids collected at the cyclone &c., are returned to the calcination vessel via tube 36. If desired the injection of hot gas may be via a plurality of holes along a hollow stirrer shaft (38), or via a separate gas inlet tube (4) arranged concentrically around the stirrer shaft.
[GB1488665A]
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB54940/73A GB1488665A (en) | 1973-11-27 | 1973-11-27 | Calcining calcium sulphate dihydrate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IE40249L IE40249L (en) | 1975-05-27 |
| IE40249B1 true IE40249B1 (en) | 1979-04-11 |
Family
ID=10472525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE2281/74A IE40249B1 (en) | 1973-11-27 | 1974-11-06 | Improvements in calcining calcium sulphate dihydrate |
Country Status (18)
| Country | Link |
|---|---|
| JP (1) | JPS56370B2 (en) |
| AT (1) | AT363376B (en) |
| BE (1) | BE822555A (en) |
| CA (1) | CA1044014A (en) |
| CH (1) | CH605449A5 (en) |
| DE (1) | DE2454857C3 (en) |
| DK (1) | DK153939C (en) |
| ES (1) | ES432269A1 (en) |
| FI (1) | FI59383C (en) |
| FR (1) | FR2252308B1 (en) |
| GB (1) | GB1488665A (en) |
| IE (1) | IE40249B1 (en) |
| IT (1) | IT1026570B (en) |
| LU (1) | LU71346A1 (en) |
| NL (1) | NL181501C (en) |
| NO (1) | NO139823C (en) |
| SE (1) | SE7414838L (en) |
| ZA (1) | ZA747209B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA793953B (en) * | 1978-08-08 | 1980-08-27 | Coal Industry Patents Ltd | Heat treatment of material |
| IE49127B1 (en) * | 1979-01-08 | 1985-08-07 | Bpb Industries Ltd | Calcination method and apparatus |
| ZA817558B (en) * | 1980-11-10 | 1983-02-23 | Bpb Industries Plc | Improvements in calcining calcium sulphate dihydrate |
| GB2140702A (en) * | 1980-11-10 | 1984-12-05 | Bpb Industries Plc | Fluidised bed calcination |
| US4744961A (en) * | 1985-04-25 | 1988-05-17 | United States Gypsum Company | Submerged combustion calcination |
| US4626199A (en) * | 1985-04-25 | 1986-12-02 | United States Gypsum Company | Submerged combustion calcination |
| DE3536321A1 (en) * | 1985-10-11 | 1987-04-23 | Bischoff Gasreinigung | Process and reactor for producing alpha-hemihydrate gypsum from calcium sulphate dihydrate from flue gas desulphurisation plants operating by the wet scrubbing process with lime |
| GB8625964D0 (en) * | 1986-10-30 | 1986-12-03 | Bpb Industries Plc | Calcination apparatus |
| US5743954A (en) * | 1995-02-02 | 1998-04-28 | United States Gypsum Company | Method for continuous refractoryless calcining of gypsum |
| US5743728A (en) * | 1995-08-15 | 1998-04-28 | Usg Corporation | Method and system for multi-stage calcining of gypsum to produce an anhydrite product |
| US7175426B2 (en) | 2004-02-27 | 2007-02-13 | United States Gypsum Company | High efficiency refractoryless kettle |
| US7434980B2 (en) | 2004-02-27 | 2008-10-14 | United States Gypsum Company | Swinging agitator for a gypsum calcining apparatus and the like |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL285104A (en) * | 1961-11-13 |
-
1973
- 1973-11-27 GB GB54940/73A patent/GB1488665A/en not_active Expired
-
1974
- 1974-11-06 IE IE2281/74A patent/IE40249B1/en unknown
- 1974-11-11 ZA ZA00747209A patent/ZA747209B/en unknown
- 1974-11-14 CA CA213,730A patent/CA1044014A/en not_active Expired
- 1974-11-19 DE DE2454857A patent/DE2454857C3/en not_active Expired
- 1974-11-20 NO NO744190A patent/NO139823C/en unknown
- 1974-11-22 FI FI3379/74A patent/FI59383C/en active
- 1974-11-22 CH CH1558274A patent/CH605449A5/xx not_active IP Right Cessation
- 1974-11-25 BE BE150817A patent/BE822555A/en not_active IP Right Cessation
- 1974-11-25 LU LU71346A patent/LU71346A1/xx unknown
- 1974-11-25 JP JP13583574A patent/JPS56370B2/ja not_active Expired
- 1974-11-26 ES ES432269A patent/ES432269A1/en not_active Expired
- 1974-11-26 DK DK613974A patent/DK153939C/en not_active IP Right Cessation
- 1974-11-26 SE SE7414838A patent/SE7414838L/xx unknown
- 1974-11-27 AT AT0949574A patent/AT363376B/en not_active IP Right Cessation
- 1974-11-27 FR FR7438830A patent/FR2252308B1/fr not_active Expired
- 1974-11-27 NL NLAANVRAGE7415482,A patent/NL181501C/en not_active IP Right Cessation
- 1974-11-27 IT IT29899/74A patent/IT1026570B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2252308B1 (en) | 1982-09-17 |
| GB1488665A (en) | 1977-10-12 |
| FI59383C (en) | 1981-08-10 |
| DE2454857B2 (en) | 1979-07-12 |
| FR2252308A1 (en) | 1975-06-20 |
| ES432269A1 (en) | 1976-12-16 |
| IT1026570B (en) | 1978-10-20 |
| DK153939B (en) | 1988-09-26 |
| NO744190L (en) | 1975-06-23 |
| FI337974A (en) | 1975-05-28 |
| SE7414838L (en) | 1975-05-28 |
| AT363376B (en) | 1981-07-27 |
| BE822555A (en) | 1975-03-14 |
| JPS56370B2 (en) | 1981-01-07 |
| AU7560974A (en) | 1976-05-27 |
| NO139823B (en) | 1979-02-05 |
| DK613974A (en) | 1975-09-29 |
| DK153939C (en) | 1989-02-20 |
| NL181501B (en) | 1987-04-01 |
| FI59383B (en) | 1981-04-30 |
| ATA949574A (en) | 1980-12-15 |
| NO139823C (en) | 1979-05-16 |
| JPS5084497A (en) | 1975-07-08 |
| DE2454857A1 (en) | 1975-05-28 |
| LU71346A1 (en) | 1975-06-11 |
| NL7415482A (en) | 1975-05-29 |
| IE40249L (en) | 1975-05-27 |
| ZA747209B (en) | 1975-11-26 |
| NL181501C (en) | 1987-09-01 |
| DE2454857C3 (en) | 1980-03-13 |
| CH605449A5 (en) | 1978-09-29 |
| CA1044014A (en) | 1978-12-12 |
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