GB1432110A - Process for the defluorination of waste gypsum from the phos phonic acid process - Google Patents

Process for the defluorination of waste gypsum from the phos phonic acid process

Info

Publication number
GB1432110A
GB1432110A GB3154374A GB3154374A GB1432110A GB 1432110 A GB1432110 A GB 1432110A GB 3154374 A GB3154374 A GB 3154374A GB 3154374 A GB3154374 A GB 3154374A GB 1432110 A GB1432110 A GB 1432110A
Authority
GB
United Kingdom
Prior art keywords
gypsum
fluorine compounds
sulphuric acid
waste gypsum
defluorination
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
GB3154374A
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.)
Patheon Austria GmbH and Co KG
Original Assignee
Chemie Linz AG
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
Priority claimed from DE19732337608 external-priority patent/DE2337608C3/en
Application filed by Chemie Linz AG filed Critical Chemie Linz AG
Publication of GB1432110A publication Critical patent/GB1432110A/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
    • C01F11/468—Purification of calcium sulfates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Treating Waste Gases (AREA)

Abstract

1432110 Gypsum CHEMIE LINZ AG 16 July 1974 [24 July 1973] 31543/74 Heading C1A Waste gypsum from the production of phosphoric acid is defluorinated by means of sulphuric acid at an elevated temperature by dehydrating the waste gypsum by calcination prior to adding the sulphuric acid and subsequently mixing the substantially anhydrous calcined gypsum while it is still hot with an amount of concentrated sulphuric acid sufficient to decompose the solid fluorine compounds contained and to expel the volatile fluorine compounds formed. The dehydration may be carried out by heating the gypsum to not more than 500‹ C. or may be carried out in two stages, the gypsum being heated to not more than 250‹ C. in the first stage, until the semi-hydrate stage is reached. The volatile fluorine compounds obtained include HF and SiF 4 .
GB3154374A 1973-07-24 1974-07-16 Process for the defluorination of waste gypsum from the phos phonic acid process Expired GB1432110A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732337608 DE2337608C3 (en) 1973-07-24 Process for the defluorination of phosphoric acid waste gypsum

Publications (1)

Publication Number Publication Date
GB1432110A true GB1432110A (en) 1976-04-14

Family

ID=5887861

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3154374A Expired GB1432110A (en) 1973-07-24 1974-07-16 Process for the defluorination of waste gypsum from the phos phonic acid process

Country Status (6)

Country Link
JP (1) JPS5050291A (en)
BE (1) BE818062A (en)
BR (1) BR7406106D0 (en)
GB (1) GB1432110A (en)
NL (1) NL7409988A (en)
ZA (1) ZA744650B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020100260A1 (en) * 2020-01-08 2021-07-08 Thyssenkrupp Ag Integrated process for the production of sulfuric acid process-suitable sulfur dioxide quality from calcium sulfate / phosphogypsum from phosphoric acid production

Also Published As

Publication number Publication date
DE2337608B2 (en) 1975-11-20
JPS5050291A (en) 1975-05-06
BE818062A (en) 1975-01-24
NL7409988A (en) 1975-01-28
DE2337608A1 (en) 1975-03-06
ZA744650B (en) 1975-08-27
BR7406106D0 (en) 1975-05-13

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed