ES442078A1 - Gypsum products and their production - Google Patents

Gypsum products and their production

Info

Publication number
ES442078A1
ES442078A1 ES75442078A ES442078A ES442078A1 ES 442078 A1 ES442078 A1 ES 442078A1 ES 75442078 A ES75442078 A ES 75442078A ES 442078 A ES442078 A ES 442078A ES 442078 A1 ES442078 A1 ES 442078A1
Authority
ES
Spain
Prior art keywords
calcium sulfate
total
crystals
dihydrate
anhydrite
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
ES75442078A
Other languages
Spanish (es)
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.)
Fisons Ltd
Original Assignee
Fisons 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 Fisons Ltd filed Critical Fisons Ltd
Publication of ES442078A1 publication Critical patent/ES442078A1/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)

Abstract

A procedure for the preparation of calcium sulfate hemihydrate and/or calcium sulfate anhydrite, characterized in that crystals of calcium sulfate dihydrate that have been produced by reaction of a phosphated material with an acid, finding the weight ratios of total Al2O3: total P2O5 and total reactive SiO2: total F in the ranges from 1:75 to 1:10 and up to 1: 1, respectively, before the initial precipitation of calcium sulfate dihydrate, precipitation of calcium sulfate and separation of calcium sulfate in In the form of calcium sulfate dihydrate crystals, they are converted, for example, by wet or dry calcination, into calcium sulfate hemihydrate and/or calcium sulfate anhydrite crystals, dehydration preferably not reducing the water of hydration to a level medium less than 0.4 mol of water per mol of CaSO4. (Machine-translation by Google Translate, not legally binding)
ES75442078A 1974-10-26 1975-10-24 Gypsum products and their production Expired ES442078A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4641174A GB1528352A (en) 1974-10-26 1974-10-26 Gypsum products and their production

Publications (1)

Publication Number Publication Date
ES442078A1 true ES442078A1 (en) 1977-07-01

Family

ID=10441158

Family Applications (1)

Application Number Title Priority Date Filing Date
ES75442078A Expired ES442078A1 (en) 1974-10-26 1975-10-24 Gypsum products and their production

Country Status (4)

Country Link
BR (1) BR7506997A (en)
ES (1) ES442078A1 (en)
FR (1) FR2289463A1 (en)
GB (1) GB1528352A (en)

Also Published As

Publication number Publication date
GB1528352A (en) 1978-10-11
BR7506997A (en) 1976-08-17
FR2289463A1 (en) 1976-05-28

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