GB319228A - Improvements in the preparation of calcium sulphate - Google Patents

Improvements in the preparation of calcium sulphate

Info

Publication number
GB319228A
GB319228A GB1720928A GB1720928A GB319228A GB 319228 A GB319228 A GB 319228A GB 1720928 A GB1720928 A GB 1720928A GB 1720928 A GB1720928 A GB 1720928A GB 319228 A GB319228 A GB 319228A
Authority
GB
United Kingdom
Prior art keywords
acid
sulphuric acid
sulphate
anhydrous
dehydrating agents
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
GB1720928A
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.)
SYDNEY FRANCIS WILLIAM CRUNDAL
Peter Spence and Sons Ltd
Original Assignee
SYDNEY FRANCIS WILLIAM CRUNDAL
Peter Spence and Sons 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 SYDNEY FRANCIS WILLIAM CRUNDAL, Peter Spence and Sons Ltd filed Critical SYDNEY FRANCIS WILLIAM CRUNDAL
Priority to GB1720928A priority Critical patent/GB319228A/en
Publication of GB319228A publication Critical patent/GB319228A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Glass Compositions (AREA)

Abstract

319,228. Spence & Sons, Ltd., P., and Crundall, S. F. W. June, 14, 1928. Calcium sulphate.-An extremely finely divided and apparently amorphous form of anhydrous calcium sulphate is obtained by treating hydrated forms thereof with suitable dehydrating agents. The hydrated salt may be mixed with sulphuric acid of specific gravity 1.6-1.84 and the mixture be maintained at 130‹ C. with agitation for say 1-2 hours, or be gradually heated to 140‹ C., or be allowed to stand at ordinary temperature for several days, or be maintained at 100‹ C. for the necessary time. The specific gravity of the sulphuric acid used should not fall below 1.3 during dehydration and the strength, quantity, and concentration thereof should be such that no solution of the sulphate or substantial formation of soluble acid sulphates occurs. The anhydrous sulphate is washed free from acid and dried, or dried and calcined. Dehydration may also be effected by fuming sulphuric acid at ordinary temperature, or by passing dry sulphur trioxide over the hydrated salt, and phosphoric acid or acid sulphates such as titanium sulphate may be used as dehydrating agents. According to the Provisional Specification, the hydrated salt may first be dissolved in concentrated sulphuric acid at say 140‹ C., and the anhydrous salt be then precipitated by dilution; or a mixture of hydrate and sulphuric acid be heated and then calcined; and phosphoric anhydride or glycerin may be used as dehydrating agents.
GB1720928A 1928-06-14 1928-06-14 Improvements in the preparation of calcium sulphate Expired GB319228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1720928A GB319228A (en) 1928-06-14 1928-06-14 Improvements in the preparation of calcium sulphate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1720928A GB319228A (en) 1928-06-14 1928-06-14 Improvements in the preparation of calcium sulphate

Publications (1)

Publication Number Publication Date
GB319228A true GB319228A (en) 1929-09-16

Family

ID=10091122

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1720928A Expired GB319228A (en) 1928-06-14 1928-06-14 Improvements in the preparation of calcium sulphate

Country Status (1)

Country Link
GB (1) GB319228A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605393C1 (en) * 1986-02-20 1987-09-03 Knauf Westdeutsche Gips Process for the preparation of anhydrous calcium sulphate (anhydrite)
US5964940A (en) * 1998-04-20 1999-10-12 Wilson; Harold W. Process for increasing the water solubility of gypsum

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605393C1 (en) * 1986-02-20 1987-09-03 Knauf Westdeutsche Gips Process for the preparation of anhydrous calcium sulphate (anhydrite)
US5964940A (en) * 1998-04-20 1999-10-12 Wilson; Harold W. Process for increasing the water solubility of gypsum

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