GB1386291A - Process for manufacturing phosphoric acid and gypsum - Google Patents
Process for manufacturing phosphoric acid and gypsumInfo
- 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
Links
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title abstract 10
- 239000010440 gypsum Substances 0.000 title abstract 10
- 229910052602 gypsum Inorganic materials 0.000 title abstract 10
- 229910000147 aluminium phosphate Inorganic materials 0.000 title abstract 5
- 238000000034 method Methods 0.000 title abstract 5
- 238000004519 manufacturing process Methods 0.000 title abstract 2
- 230000029087 digestion Effects 0.000 abstract 5
- 229910052783 alkali metal Inorganic materials 0.000 abstract 4
- 150000001340 alkali metals Chemical class 0.000 abstract 4
- 239000000706 filtrate Substances 0.000 abstract 4
- 238000005406 washing Methods 0.000 abstract 3
- 239000002253 acid Substances 0.000 abstract 2
- 239000012452 mother liquor Substances 0.000 abstract 2
- 239000002367 phosphate rock Substances 0.000 abstract 2
- 238000004064 recycling Methods 0.000 abstract 2
- 229920006395 saturated elastomer Polymers 0.000 abstract 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 abstract 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 238000005188 flotation Methods 0.000 abstract 1
- 229910052731 fluorine Inorganic materials 0.000 abstract 1
- 239000011737 fluorine Substances 0.000 abstract 1
- 239000012535 impurity Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/08—Compounds containing halogen
- C01B33/10—Compounds containing silicon, fluorine, and other elements
- C01B33/103—Fluosilicic acid; Salts thereof
-
- 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
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.
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)
| 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)
| 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 |
-
1972
- 1972-02-29 BE BE779982A patent/BE779982A/en unknown
- 1972-02-29 FR FR7206907A patent/FR2128432B1/fr not_active Expired
- 1972-03-01 GB GB958572A patent/GB1386291A/en not_active Expired
- 1972-03-01 CA CA135,919A patent/CA967721A/en not_active Expired
- 1972-03-01 NL NL7202664A patent/NL7202664A/xx not_active Application Discontinuation
- 1972-03-02 SE SE02694/72A patent/SE365490B/xx unknown
Cited By (6)
| 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 |
|---|---|
| SE365490B (en) | 1974-03-25 |
| FR2128432B1 (en) | 1974-06-28 |
| BE779982A (en) | 1972-06-16 |
| NL7202664A (en) | 1972-09-05 |
| CA967721A (en) | 1975-05-20 |
| FR2128432A1 (en) | 1972-10-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |