GB1386291A - Process for manufacturing phosphoric acid and gypsum - Google Patents

Process for manufacturing phosphoric acid and gypsum

Info

Publication number
GB1386291A
GB1386291A GB958572A GB958572A GB1386291A GB 1386291 A GB1386291 A GB 1386291A GB 958572 A GB958572 A GB 958572A GB 958572 A GB958572 A GB 958572A GB 1386291 A GB1386291 A GB 1386291A
Authority
GB
United Kingdom
Prior art keywords
gypsum
silicofluoride
phosphoric acid
excess
acid
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
GB958572A
Inventor
K Scheel
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.)
Knauf Gips KG
Original Assignee
Gebr Knauf Westdeutsche Gipswerke
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 DE19712109715 external-priority patent/DE2109715C3/en
Application filed by Gebr Knauf Westdeutsche Gipswerke filed Critical Gebr Knauf Westdeutsche Gipswerke
Publication of GB1386291A publication Critical patent/GB1386291A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B33/00Silicon; Compounds thereof
    • C01B33/08Compounds containing halogen
    • C01B33/10Compounds containing silicon, fluorine, and other elements
    • C01B33/103Fluosilicic acid; Salts thereof
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00Compounds of calcium, strontium, or barium
    • C01F11/46Sulfates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Silicon Compounds (AREA)

Abstract

1386291 Manufacturing phosphoric acid and gypsum KNAUF WESTDEUTSCHE GIPSWERKE Gebr 1 March 1972 [2 March 1971 21 Feb 1972] 9585/72 Heading C1A Phosphoric acid and gypsum are produced by digesting rock phosphate with sulphuric acid and (a) filtering the digestion products to remove the phosphoric acid to separate the gypsum, collecting the pre-filtrate and excess acid over that removed and recycling it to the digestion process and (b) displacing the phosphoric acid from the gypsum of step (a) by washing the gypsum with an alkali metal silicofluoride solution (e.g. by suspending the gypsum in a hot wash solution and separating organic impurities by flotation) and recycling the wash filtrate to the digestion process, (c) washing the gypsum from step (b) to remove alkali metal silicofluoride using a hot wash solution (e.g. 70- 100‹ C.) of alkali metal silicofluoride which is saturated with silicofluoride when cold, removing the purified gypsum and the mother liquor which is cooled, excess silicofluoride separated off and recycled. The gypsum from step (c) can be further purified by washing with water the wash filtrate being recycled to step (c). The excess silicofluoride may be separated from the mother liquor of step (c) by passing through a cooled vacuum crystallizer (e.g. 10-30‹ C. for 1-10 hours residence time) and the cold saturated silicofluoride solution reheated and used in step (c) or recycled directly to step (b) after which it is cooled, the excess alkali metal silicofluoride separated therefrom and the wash filtrate recycled to the digestion process. A stoichiometric equivalent of silicic acid or a reactive silicate may be added to the digestion process to ensure conversion of all fluorine values in the rock phosphate to fluosilicic acid or salt thereof.
GB958572A 1971-03-02 1972-03-01 Process for manufacturing phosphoric acid and gypsum Expired GB1386291A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19712109715 DE2109715C3 (en) 1971-03-02 Process for the production of phosphoric acid
DE19722208049 DE2208049C3 (en) 1972-02-21 Process for the production of phosphoric acid by the wet process with the production of a gypsum suitable for further processing

Publications (1)

Publication Number Publication Date
GB1386291A true GB1386291A (en) 1975-03-05

Family

ID=25760743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB958572A Expired GB1386291A (en) 1971-03-02 1972-03-01 Process for manufacturing phosphoric acid and gypsum

Country Status (6)

Country Link
BE (1) BE779982A (en)
CA (1) CA967721A (en)
FR (1) FR2128432B1 (en)
GB (1) GB1386291A (en)
NL (1) NL7202664A (en)
SE (1) SE365490B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9017495B2 (en) 2000-01-05 2015-04-28 Saint-Gobain Adfors Canada, Ltd. Methods of making smooth reinforced cementitious boards
CN109485083A (en) * 2018-12-20 2019-03-19 四川久大蓬莱盐化有限公司 A kind of preparation method and preparation system of feed addictive calcium sulfate
CN113072046A (en) * 2021-04-09 2021-07-06 郑州大学 Method for removing impurities and improving whiteness of phosphogypsum through flotation method
CN113603249A (en) * 2021-08-24 2021-11-05 云南弘祥化工有限公司 Process for precipitating sewage in phosphogypsum slag field for sodium fluosilicate production

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115784238B (en) * 2022-10-18 2024-03-12 宜都兴发化工有限公司 Method for recycling soluble fluorine in phosphogypsum

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9017495B2 (en) 2000-01-05 2015-04-28 Saint-Gobain Adfors Canada, Ltd. Methods of making smooth reinforced cementitious boards
CN109485083A (en) * 2018-12-20 2019-03-19 四川久大蓬莱盐化有限公司 A kind of preparation method and preparation system of feed addictive calcium sulfate
CN113072046A (en) * 2021-04-09 2021-07-06 郑州大学 Method for removing impurities and improving whiteness of phosphogypsum through flotation method
CN113072046B (en) * 2021-04-09 2022-06-17 郑州大学 Method for removing impurities and improving whiteness of phosphogypsum through flotation method
CN113603249A (en) * 2021-08-24 2021-11-05 云南弘祥化工有限公司 Process for precipitating sewage in phosphogypsum slag field for sodium fluosilicate production
CN113603249B (en) * 2021-08-24 2023-10-31 云南弘祥化工有限公司 Process for precipitating sewage in phosphogypsum slag field for sodium fluosilicate production

Also Published As

Publication number Publication date
BE779982A (en) 1972-06-16
FR2128432A1 (en) 1972-10-20
NL7202664A (en) 1972-09-05
FR2128432B1 (en) 1974-06-28
SE365490B (en) 1974-03-25
CA967721A (en) 1975-05-20

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees