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GB1488665A - Calcining calcium sulphate dihydrate - Google Patents

Calcining calcium sulphate dihydrate

Info

Publication number
GB1488665A
GB1488665A GB54940/73A GB5494073A GB1488665A GB 1488665 A GB1488665 A GB 1488665A GB 54940/73 A GB54940/73 A GB 54940/73A GB 5494073 A GB5494073 A GB 5494073A GB 1488665 A GB1488665 A GB 1488665A
Authority
GB
United Kingdom
Prior art keywords
tube
calcination
vessel
hot gas
cyclone
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
Application number
GB54940/73A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BPB Ltd
Original Assignee
BPB Industries PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BPB Industries PLC filed Critical BPB Industries PLC
Priority to GB54940/73A priority Critical patent/GB1488665A/en
Priority to IE2281/74A priority patent/IE40249B1/en
Priority to ZA00747209A priority patent/ZA747209B/en
Priority to CA213,730A priority patent/CA1044014A/en
Priority to DE2454857A priority patent/DE2454857C3/en
Priority to NO744190A priority patent/NO139823C/en
Priority to AU75609/74A priority patent/AU489475B2/en
Priority to FI3379/74A priority patent/FI59383C/en
Priority to CH1558274A priority patent/CH605449A5/xx
Priority to LU71346A priority patent/LU71346A1/xx
Priority to JP13583574A priority patent/JPS56370B2/ja
Priority to BE150817A priority patent/BE822555A/en
Priority to ES432269A priority patent/ES432269A1/en
Priority to SE7414838A priority patent/SE7414838L/xx
Priority to DK613974A priority patent/DK153939C/en
Priority to IT29899/74A priority patent/IT1026570B/en
Priority to FR7438830A priority patent/FR2252308B1/fr
Priority to AT0949574A priority patent/AT363376B/en
Priority to NLAANVRAGE7415482,A priority patent/NL181501C/en
Publication of GB1488665A publication Critical patent/GB1488665A/en
Expired legal-status Critical Current

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.
GB54940/73A 1973-11-27 1973-11-27 Calcining calcium sulphate dihydrate Expired GB1488665A (en)

Priority Applications (19)

Application Number Priority Date Filing Date Title
GB54940/73A GB1488665A (en) 1973-11-27 1973-11-27 Calcining calcium sulphate dihydrate
IE2281/74A IE40249B1 (en) 1973-11-27 1974-11-06 Improvements in calcining calcium sulphate dihydrate
ZA00747209A ZA747209B (en) 1973-11-27 1974-11-11 Improvements in calcining calcium sulphate dihydrate
CA213,730A CA1044014A (en) 1973-11-27 1974-11-14 Calcining calcium sulphate dihydrate
DE2454857A DE2454857C3 (en) 1973-11-27 1974-11-19 Device for burning plaster
NO744190A NO139823C (en) 1973-11-27 1974-11-20 METHOD AND APPLIANCE FOR BURNING CALCIUM SULPHATE DIHYDRATE
AU75609/74A AU489475B2 (en) 1973-11-27 1974-11-21 Improvements in calcining calcium sulphate dihydrate
FI3379/74A FI59383C (en) 1973-11-27 1974-11-22 OIL ANCHORING FOR CALCINATION OF CALCIUM SULPHATE DIHYDRATE
CH1558274A CH605449A5 (en) 1973-11-27 1974-11-22
LU71346A LU71346A1 (en) 1973-11-27 1974-11-25
JP13583574A JPS56370B2 (en) 1973-11-27 1974-11-25
BE150817A BE822555A (en) 1973-11-27 1974-11-25 METHOD AND APPARATUS FOR CALCINATION OF CALCIUM SULPHATE FROM WATER MOLECULES
ES432269A ES432269A1 (en) 1973-11-27 1974-11-26 Calcining calcium sulphate dihydrate
SE7414838A SE7414838L (en) 1973-11-27 1974-11-26
DK613974A DK153939C (en) 1973-11-27 1974-11-26 PROCEDURE FOR CALCINATING CALCIUM SULPHATE DIHYDRATE AND APPARATUS FOR EXERCISING THE PROCEDURE
IT29899/74A IT1026570B (en) 1973-11-27 1974-11-27 METHOD AND APPARATUS FOR CALCINATING CALCIUM SULFATE HYDRATE
FR7438830A FR2252308B1 (en) 1973-11-27 1974-11-27
AT0949574A AT363376B (en) 1973-11-27 1974-11-27 METHOD AND DEVICE FOR CALCINATING PLASTER
NLAANVRAGE7415482,A NL181501C (en) 1973-11-27 1974-11-27 DEVICE FOR PREPARING BURNED GIPS.

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 (1)

Publication Number Publication Date
GB1488665A true GB1488665A (en) 1977-10-12

Family

ID=10472525

Family Applications (1)

Application Number Title Priority Date Filing Date
GB54940/73A Expired GB1488665A (en) 1973-11-27 1973-11-27 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)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455285A (en) * 1978-08-08 1984-06-19 Watkins David W Heat treatment of material
GB2140702A (en) * 1980-11-10 1984-12-05 Bpb Industries Plc Fluidised bed calcination
FR2581170A1 (en) * 1985-04-25 1986-10-31 United States Gypsum Co DROWNED COMBUSTION APPARATUS AND GYPSUM CALCINATION METHOD
US4629419A (en) * 1979-01-08 1986-12-16 Bpb Industries Public Limited Company Calcination method and apparatus
US4744961A (en) * 1985-04-25 1988-05-17 United States Gypsum Company Submerged combustion calcination
GB2198428A (en) * 1986-10-30 1988-06-15 Bpb Industries Plc Gypsum calcination apparatus
US5743728A (en) * 1995-08-15 1998-04-28 Usg Corporation Method and system for multi-stage calcining of gypsum to produce an anhydrite product
US5927968A (en) * 1995-02-02 1999-07-27 United States Gypsum Company Apparatus for continuous refractoryless calcining of gypsum
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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA817558B (en) * 1980-11-10 1983-02-23 Bpb Industries Plc Improvements in calcining calcium sulphate dihydrate
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

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL285104A (en) * 1961-11-13

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455285A (en) * 1978-08-08 1984-06-19 Watkins David W Heat treatment of material
US4629419A (en) * 1979-01-08 1986-12-16 Bpb Industries Public Limited Company Calcination method and apparatus
GB2140702A (en) * 1980-11-10 1984-12-05 Bpb Industries Plc Fluidised bed calcination
FR2581170A1 (en) * 1985-04-25 1986-10-31 United States Gypsum Co DROWNED COMBUSTION APPARATUS AND GYPSUM CALCINATION METHOD
US4744961A (en) * 1985-04-25 1988-05-17 United States Gypsum Company Submerged combustion calcination
GB2198428A (en) * 1986-10-30 1988-06-15 Bpb Industries Plc Gypsum calcination apparatus
AU604510B2 (en) * 1986-10-30 1990-12-20 Bpb Industries Public Limited Company Improvements in calcination apparatus
US5927968A (en) * 1995-02-02 1999-07-27 United States Gypsum Company Apparatus 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
US5954497A (en) * 1995-08-15 1999-09-21 Usg Corporation Method 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

Also Published As

Publication number Publication date
DE2454857A1 (en) 1975-05-28
CA1044014A (en) 1978-12-12
CH605449A5 (en) 1978-09-29
FI337974A7 (en) 1975-05-28
SE7414838L (en) 1975-05-28
AT363376B (en) 1981-07-27
ATA949574A (en) 1980-12-15
DE2454857C3 (en) 1980-03-13
DE2454857B2 (en) 1979-07-12
JPS5084497A (en) 1975-07-08
NL7415482A (en) 1975-05-29
FR2252308A1 (en) 1975-06-20
IT1026570B (en) 1978-10-20
FI59383C (en) 1981-08-10
FI59383B (en) 1981-04-30
FR2252308B1 (en) 1982-09-17
AU7560974A (en) 1976-05-27
LU71346A1 (en) 1975-06-11
ZA747209B (en) 1975-11-26
NO139823C (en) 1979-05-16
IE40249L (en) 1975-05-27
NO744190L (en) 1975-06-23
NL181501B (en) 1987-04-01
IE40249B1 (en) 1979-04-11
NO139823B (en) 1979-02-05
NL181501C (en) 1987-09-01
ES432269A1 (en) 1976-12-16
DK153939B (en) 1988-09-26
DK613974A (en) 1975-09-29
BE822555A (en) 1975-03-14
DK153939C (en) 1989-02-20
JPS56370B2 (en) 1981-01-07

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years

Effective date: 19941030