GB163468A - Improvements in the manufacture of plaster of paris - Google Patents

Improvements in the manufacture of plaster of paris

Info

Publication number
GB163468A
GB163468A GB4890/20A GB489020A GB163468A GB 163468 A GB163468 A GB 163468A GB 4890/20 A GB4890/20 A GB 4890/20A GB 489020 A GB489020 A GB 489020A GB 163468 A GB163468 A GB 163468A
Authority
GB
United Kingdom
Prior art keywords
steam
retort
plaster
conveyed
pipes
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
GB4890/20A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB4890/20A priority Critical patent/GB163468A/en
Priority to FR530986D priority patent/FR530986A/en
Priority to DE1921344478D priority patent/DE344478C/en
Publication of GB163468A publication Critical patent/GB163468A/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
    • C04B11/0281—Kettles; Marmites; Autoclaves
    • C04B11/0282—Autoclaves, e.g. using chariots

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Moulding By Coating Moulds (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

163,468. Brothers, W. M. Feb. 18, 1920. Calcium sulphate.-Consists in the manufacture of plaster of paris in a continuous manner by feeding powdered gypsum or old plaster moulds through a closed vessel under pressure, in the presence of dry steam at 380-420‹ F., generated only from the raw material itself. Using the apparatus shown in Fig. 1, the dry, powdered, or granular material is fed continuously into the retort A through the rotary valve C and is conveyed to the discharge valve C<1> by screw D. Fig. 2 indicates another form of retort, which is raised to the necessary temperature by means of steam under pressure. Steam entering at H passes through the closed system of pipes G which, being mounted on the circular plates g provided with trunnions, can be rotated. The material is conveyed through the retort by means of the vanes d arranged spirally round the steam-pipes. Specifications 5853/04 and 20789/12 are referred to.
GB4890/20A 1920-02-18 1920-02-18 Improvements in the manufacture of plaster of paris Expired GB163468A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB4890/20A GB163468A (en) 1920-02-18 1920-02-18 Improvements in the manufacture of plaster of paris
FR530986D FR530986A (en) 1920-02-18 1921-02-14 Manufacturing process of plaster of paris
DE1921344478D DE344478C (en) 1920-02-18 1921-02-15 Process for the production of plaster of paris

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4890/20A GB163468A (en) 1920-02-18 1920-02-18 Improvements in the manufacture of plaster of paris
FR530986T 1921-02-14

Publications (1)

Publication Number Publication Date
GB163468A true GB163468A (en) 1921-05-18

Family

ID=9785774

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4890/20A Expired GB163468A (en) 1920-02-18 1920-02-18 Improvements in the manufacture of plaster of paris

Country Status (3)

Country Link
DE (1) DE344478C (en)
FR (1) FR530986A (en)
GB (1) GB163468A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115636610A (en) * 2022-10-26 2023-01-24 山西中矿石膏规划设计研究院有限公司 Static still kettle suitable for producing gypsum from granular raw materials

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479576A (en) * 1942-03-02 1949-08-23 Lewis C Karrick Apparatus for making building material
DE937276C (en) * 1950-04-18 1955-12-29 Edmund Boergardts Method and device for firing plaster of paris
DE952967C (en) * 1952-01-01 1956-11-22 Emil Thiel System for dewatering gypsum using overheated, pressurized steam
FR2453117A1 (en) * 1979-04-03 1980-10-31 France Platrieres Alpha calcium sulphate hemi-hydrate mfr. for plaster - by inexpensive dry roasting of gypsum at just above atmospheric pressure
DE102007024188B3 (en) 2007-05-24 2008-04-10 Grenzebach Bsh Gmbh Production of alpha calcium hemihydrate from calcium dihydrate comprises charging an autoclave with calcium dihydrate, indirectly heating the autoclave, adding water in a controlled manner and mixing and further processing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115636610A (en) * 2022-10-26 2023-01-24 山西中矿石膏规划设计研究院有限公司 Static still kettle suitable for producing gypsum from granular raw materials

Also Published As

Publication number Publication date
FR530986A (en) 1922-01-04
DE344478C (en) 1921-11-24

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