GB561205A - Improvements in or relating to the production of gypsum from anhydrite - Google Patents

Improvements in or relating to the production of gypsum from anhydrite

Info

Publication number
GB561205A
GB561205A GB970042A GB970042A GB561205A GB 561205 A GB561205 A GB 561205A GB 970042 A GB970042 A GB 970042A GB 970042 A GB970042 A GB 970042A GB 561205 A GB561205 A GB 561205A
Authority
GB
United Kingdom
Prior art keywords
sulphate
sulphates
gypsum
trivalent
mono
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
GB970042A
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.)
FRANCIS ROBERT HIMSWORTH
Imperial Chemical Industries Ltd
Original Assignee
FRANCIS ROBERT HIMSWORTH
Imperial Chemical Industries 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 FRANCIS ROBERT HIMSWORTH, Imperial Chemical Industries Ltd filed Critical FRANCIS ROBERT HIMSWORTH
Priority to GB970042A priority Critical patent/GB561205A/en
Publication of GB561205A publication Critical patent/GB561205A/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
    • C04B11/06—Calcium sulfate cements starting from anhydrite
    • 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
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer

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)

Abstract

561,205. Gypsum. HIMSWORTH, F. R., LEFEBURE, V., and IMPERIAL CHEMICAL INDUSTRIES, Ltd. July 13, 1942, No. 9700. [Class 1 (iii)] Gypsum, in a form suitable for conversion to plaster of Paris,. is obtained by hydrating ground anhydrite in the presence of a catalyst comprising one or more mono-varent sulphates and one or more trivalent sulphates with or without one or more divalent sulphates, the mono-valent sulphate being of alkali metal or ammonium, the trivalent being of aluminium or ferric iron, and the divalent zinc sulphate, cupric sulphate or ferrous sulphate and the percentage molecular composition falling within the area of the curve I on the diagram showing the molecular proportions of the several catalyst materials. Preferred proportions are 'those falling within the curve II and may comprise a mixture of potassium sulphate K2SO4 and aluminium sulphate, Al2(SO4)3.13H2O, in the ratio of 3 : 1 by weight. The pH of the solution may be controlled at less than 5 by addition of sulphuric acid, and the process may be conducted in the presence of seed crystals obtained as described in Specification 561,206.
GB970042A 1942-07-13 1942-07-13 Improvements in or relating to the production of gypsum from anhydrite Expired GB561205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB970042A GB561205A (en) 1942-07-13 1942-07-13 Improvements in or relating to the production of gypsum from anhydrite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB970042A GB561205A (en) 1942-07-13 1942-07-13 Improvements in or relating to the production of gypsum from anhydrite

Publications (1)

Publication Number Publication Date
GB561205A true GB561205A (en) 1944-05-10

Family

ID=9877076

Family Applications (1)

Application Number Title Priority Date Filing Date
GB970042A Expired GB561205A (en) 1942-07-13 1942-07-13 Improvements in or relating to the production of gypsum from anhydrite

Country Status (1)

Country Link
GB (1) GB561205A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387083A (en) * 1978-12-13 1983-06-07 Stamicarbon, B.V. Process for the preparation of calcium sulphate anhydrite and calcium sulphate anhydrite obtained by this process
EP0096063A1 (en) * 1981-12-14 1983-12-21 United States Gypsum Co Process for rapid conversion of fluoroanhydrite to gypsum.
FR2667585A1 (en) * 1990-10-09 1992-04-10 Cargas Blancas Inorganicas Sa Calcium sulphate di:hydrate paper filler prepn.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4387083A (en) * 1978-12-13 1983-06-07 Stamicarbon, B.V. Process for the preparation of calcium sulphate anhydrite and calcium sulphate anhydrite obtained by this process
EP0096063A1 (en) * 1981-12-14 1983-12-21 United States Gypsum Co Process for rapid conversion of fluoroanhydrite to gypsum.
EP0096063A4 (en) * 1981-12-14 1985-07-01 United States Gypsum Co Process for rapid conversion of fluoroanhydrite to gypsum.
FR2667585A1 (en) * 1990-10-09 1992-04-10 Cargas Blancas Inorganicas Sa Calcium sulphate di:hydrate paper filler prepn.

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