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GB1224149A - Production of alpha plaster - Google Patents

Production of alpha plaster

Info

Publication number
GB1224149A
GB1224149A GB1243269A GB1243269A GB1224149A GB 1224149 A GB1224149 A GB 1224149A GB 1243269 A GB1243269 A GB 1243269A GB 1243269 A GB1243269 A GB 1243269A GB 1224149 A GB1224149 A GB 1224149A
Authority
GB
United Kingdom
Prior art keywords
slurry
autoclave
water
plaster
gypsum
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
GB1243269A
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.)
Conzinc Riotinto of Australia Ltd
Conzinc Riotinto Ltd
Original Assignee
Conzinc Riotinto of Australia Ltd
Conzinc Riotinto 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 Conzinc Riotinto of Australia Ltd, Conzinc Riotinto Ltd filed Critical Conzinc Riotinto of Australia Ltd
Publication of GB1224149A publication Critical patent/GB1224149A/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
    • C04B11/032—Devices therefor characterised by the type of calcining devices used therefor or by the type of hemihydrate obtained for the wet process, e.g. dehydrating in solution or under saturated vapour conditions, i.e. to obtain alpha-hemihydrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/18—Stationary reactors having moving elements inside
    • B01J19/20—Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/18—Details relating to the spatial orientation of the reactor
    • B01J2219/187—Details relating to the spatial orientation of the reactor inclined at an angle to the horizontal or to the vertical plane

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

1,224,149. Continuous production of alpha plaster. CONZINC RIOTINTO OF AUSTRALIA Ltd. 10 March, 1969 [28 March, 1968], No. 12432/69. Heading C1A. A method of producing alpha plaster comprises forming a slurry of particulate gypsum and water and elevating the slurry in an upwardly sloping elongated autoclave while subjecting the slurry to heat and pressure. A slurry of particulate gypsum and water, preferably containing between 5 and 45 % free water, is introduced into the lower end of the autoclave which may be of variable inclination, the angle of inclination preferably being between 5 and 45 degrees, most preferably between 15 and 35 degrees; further gypsum and water is fed into the said slurry while elevating the slurry in the autoclave by mechanical means, preferably a screw conveyer, which gives stirring and progressive dewatering of the slurry as it is being elevated, the slurry being subjected to pressure and heat, preferably between 110‹ and 140‹ C., most preferably between 115‹ and 125‹ C.; at or near the upper end of the autoclave alpha plaster is discharged, said plaster being in the form of a thin slurry or a damp product suitable for drying. Apparatus suitable for carrying out the process of the invention is described.
GB1243269A 1968-03-28 1969-03-10 Production of alpha plaster Expired GB1224149A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU35674/68A AU423448B2 (en) 1968-03-28 1968-03-28 Production of alpha plaster

Publications (1)

Publication Number Publication Date
GB1224149A true GB1224149A (en) 1971-03-03

Family

ID=3722979

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1243269A Expired GB1224149A (en) 1968-03-28 1969-03-10 Production of alpha plaster

Country Status (2)

Country Link
AU (1) AU423448B2 (en)
GB (1) GB1224149A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077475A3 (en) * 1981-10-03 1985-08-21 Quante, Heinrich Process and apparatus for the pressureless production of alpha-calcium sulphate-hemihydrate
WO1998051634A1 (en) * 1997-05-09 1998-11-19 Georg Gebhard Method and device for producing storage mineral constituents to immobilize harmful substances and for producing components, specially building slabs and mixtures
WO2001066044A3 (en) * 2000-03-03 2002-09-12 Smith & Nephew Inc Shaped particle and composition for bone deficiency and method of making the particle
WO2008141627A1 (en) 2007-05-24 2008-11-27 Grenzebach-Bsh Gmbh Method for the production of alpha-calcium sulfate hemihydrate from calcium sulfate dihydrate
DE102018132084B4 (en) * 2018-12-13 2020-10-15 ARCUS Greencycling Technologies GmbH Screw conveyor; Method for removing or preventing deposits on an inner wall of a tube of a screw conveyor
WO2021254550A1 (en) 2020-06-16 2021-12-23 ARCUS Greencycling Technologies GmbH Screw conveyor, and method for eliminating or preventing deposits on an inner wall of a tube of a screw conveyor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077475A3 (en) * 1981-10-03 1985-08-21 Quante, Heinrich Process and apparatus for the pressureless production of alpha-calcium sulphate-hemihydrate
WO1998051634A1 (en) * 1997-05-09 1998-11-19 Georg Gebhard Method and device for producing storage mineral constituents to immobilize harmful substances and for producing components, specially building slabs and mixtures
WO2001066044A3 (en) * 2000-03-03 2002-09-12 Smith & Nephew Inc Shaped particle and composition for bone deficiency and method of making the particle
WO2008141627A1 (en) 2007-05-24 2008-11-27 Grenzebach-Bsh Gmbh Method for the production of alpha-calcium sulfate hemihydrate from calcium sulfate dihydrate
US7951352B2 (en) 2007-05-24 2011-05-31 Grenzebach-Bsh Gmbh Method for the production of alpha-calcium sulfate hemihydrate from calcium sulfate dihydrate
KR101121656B1 (en) 2007-05-24 2012-04-16 그렌쩨바흐 베에스하 게엠베하 Method for the production of alpha-calcium sulfate hemihydrate from calcium sulfate dihydrate
DE102018132084B4 (en) * 2018-12-13 2020-10-15 ARCUS Greencycling Technologies GmbH Screw conveyor; Method for removing or preventing deposits on an inner wall of a tube of a screw conveyor
WO2021254550A1 (en) 2020-06-16 2021-12-23 ARCUS Greencycling Technologies GmbH Screw conveyor, and method for eliminating or preventing deposits on an inner wall of a tube of a screw conveyor

Also Published As

Publication number Publication date
AU423448B2 (en) 1972-04-21
AU3567468A (en) 1970-09-10

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