GB392780A - Calcination of gypsum - Google Patents

Calcination of gypsum

Info

Publication number
GB392780A
GB392780A GB2275932A GB2275932A GB392780A GB 392780 A GB392780 A GB 392780A GB 2275932 A GB2275932 A GB 2275932A GB 2275932 A GB2275932 A GB 2275932A GB 392780 A GB392780 A GB 392780A
Authority
GB
United Kingdom
Prior art keywords
zone
gypsum
heated
temperature
spring
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
GB2275932A
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.)
Gypsum Lime and Alabastine Canada Ltd
Original Assignee
Gypsum Lime and Alabastine Canada Ltd
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 Gypsum Lime and Alabastine Canada Ltd filed Critical Gypsum Lime and Alabastine Canada Ltd
Priority to GB2275932A priority Critical patent/GB392780A/en
Publication of GB392780A publication Critical patent/GB392780A/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
    • C04B11/028—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained
    • C04B11/036—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the dry process, e.g. dehydrating in a fluidised bed or in a rotary kiln, i.e. to obtain beta-hemihydrate

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)

Abstract

Plaster of Paris is obtained by preheating crushed gypsum, preferably in a zone maintained below 200 DEG F., and then passing the heated mass through a zone maintained at a temperature substantially higher than the calcining temperature, viz. above 350 DEG F. and preferably at about 650 DEG F. In an apparatus for effecting this process, crushed gypsum is fed from hopper 2 into preheating zone 1, <PICT:0392780/III/1> which is given a successive slow forward and quick backward movement by rotating cam 4 and spring 5. The zone is heated by electrical means 6. The material passes in a shallow layer to the calcining zone 9 heated by electrical means 6<1>, 15, and travels therethrough by the agency of cam 4<1> and spring 5<1>. The temperature of this zone and the rate of passage of the material therethrough are so correlated that over-calcination is avoided, and all of the gypsum is reduced to the hemihydrate stage, the finished material being discharged into a closed cooling pit 11. The various parts of the apparatus are connected by flexible couplings 7, 8, 12. A steam-outlet valve 13 is provided in chamber 9.
GB2275932A 1932-08-13 1932-08-13 Calcination of gypsum Expired GB392780A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2275932A GB392780A (en) 1932-08-13 1932-08-13 Calcination of gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2275932A GB392780A (en) 1932-08-13 1932-08-13 Calcination of gypsum

Publications (1)

Publication Number Publication Date
GB392780A true GB392780A (en) 1933-05-25

Family

ID=10184615

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2275932A Expired GB392780A (en) 1932-08-13 1932-08-13 Calcination of gypsum

Country Status (1)

Country Link
GB (1) GB392780A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437330A (en) * 1965-11-26 1969-04-08 Conzinc Riotinto Ltd Continuous production of alpha plaster
WO1987003508A1 (en) * 1985-12-04 1987-06-18 Dieter Roddewig Process and device for drying and/or burning powdery materials
CN110451831A (en) * 2019-08-28 2019-11-15 绵竹市恒远环保科技有限公司 Building gypsum plaster calcine technology and device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437330A (en) * 1965-11-26 1969-04-08 Conzinc Riotinto Ltd Continuous production of alpha plaster
WO1987003508A1 (en) * 1985-12-04 1987-06-18 Dieter Roddewig Process and device for drying and/or burning powdery materials
CN110451831A (en) * 2019-08-28 2019-11-15 绵竹市恒远环保科技有限公司 Building gypsum plaster calcine technology and device

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