GB1429259A - Production of plaster - Google Patents

Production of plaster

Info

Publication number
GB1429259A
GB1429259A GB4741873A GB4741873A GB1429259A GB 1429259 A GB1429259 A GB 1429259A GB 4741873 A GB4741873 A GB 4741873A GB 4741873 A GB4741873 A GB 4741873A GB 1429259 A GB1429259 A GB 1429259A
Authority
GB
United Kingdom
Prior art keywords
seconds
stage
air
plaster
caso
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
GB4741873A
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.)
Air Industrie SA
Orkem SA
Original Assignee
Air Industrie SA
Chimique des Charbonnages SA
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 Air Industrie SA, Chimique des Charbonnages SA filed Critical Air Industrie SA
Publication of GB1429259A publication Critical patent/GB1429259A/en
Expired legal-status Critical Current

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.
GB4741873A 1972-10-12 1973-10-10 Production of plaster Expired GB1429259A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7236170A FR2202851B1 (en) 1972-10-12 1972-10-12

Publications (1)

Publication Number Publication Date
GB1429259A true GB1429259A (en) 1976-03-24

Family

ID=9105549

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4741873A Expired GB1429259A (en) 1972-10-12 1973-10-10 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)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140702A (en) * 1980-11-10 1984-12-05 Bpb Industries Plc Fluidised bed calcination
CN112811837A (en) * 2020-12-31 2021-05-18 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

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140702A (en) * 1980-11-10 1984-12-05 Bpb Industries Plc Fluidised bed calcination
CN112811837A (en) * 2020-12-31 2021-05-18 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
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

Also Published As

Publication number Publication date
ES419558A1 (en) 1976-07-16
OA04674A (en) 1980-07-31
IL43439A (en) 1976-08-31
IE38376B1 (en) 1978-03-01
FR2202851A1 (en) 1974-05-10
DE2350772A1 (en) 1974-04-18
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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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee