GB1396217A - Defluorination of phosphoric acid - Google Patents
Defluorination of phosphoric acidInfo
- Publication number
- GB1396217A GB1396217A GB2107973A GB2107973A GB1396217A GB 1396217 A GB1396217 A GB 1396217A GB 2107973 A GB2107973 A GB 2107973A GB 2107973 A GB2107973 A GB 2107973A GB 1396217 A GB1396217 A GB 1396217A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- amount
- phosphoric acid
- mixture
- precipitate
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/222—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/22—Preparation by reacting phosphate-containing material with an acid, e.g. wet process
- C01B25/2208—Preparation by reacting phosphate-containing material with an acid, e.g. wet process with an acid or a mixture of acids other than sulfuric acid
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/237—Selective elimination of impurities
- C01B25/2372—Anionic impurities, e.g. silica or boron compounds
- C01B25/2375—Fluoride or fluosilicate anion
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
- Extraction Or Liquid Replacement (AREA)
- Silicon Compounds (AREA)
Abstract
1396217 Defluorinating phosphoric acid HOECHST AG 3 May 1973 [4 May 1972] 21079/73 Heading C1A Wet-process phosphoric acid containing 25- 35% by wt. P 2 O 5 and 0À3-2À0% by wt. F is defluorinated by agitating a mixture of the acid with (a) granular calcium metasilicate in an amount 0À2-2 times the amount of F present in the acid, and(b) a soluble Na compound, e.g. NaOH, at a temp. of 30-80‹ C., then allowing the resultant mixture to stand for 10-120 mins. and then separating the precipitated F values. A polymethacrylate flocculating agent may be added to the agitated mixture in an amount of 0À5-2 g./m,<SP>3</SP> of acid. The calcium metasilicate may be the rapidly cooled slag from an electrothermal phosphorus or thermal reduction furnace. The precipitate may be allowed to settle and the clear supernatent liquor separated from the sludge which is recycled to the wet-process, optionally after being placed on a filter used for separating CaSO 4 from processed phosphate ore. The precipitate may alternatively be separated on a vacuum or pressure filter.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722221745 DE2221745C3 (en) | 1972-05-04 | 1972-05-04 | Process for the defluorination of phosphoric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1396217A true GB1396217A (en) | 1975-06-04 |
Family
ID=5843984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2107973A Expired GB1396217A (en) | 1972-05-04 | 1973-05-03 | Defluorination of phosphoric acid |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1001824A (en) |
| DE (1) | DE2221745C3 (en) |
| FR (1) | FR2183277B1 (en) |
| GB (1) | GB1396217A (en) |
| NL (1) | NL7305595A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299977C (en) * | 2005-11-04 | 2007-02-14 | 华中师范大学 | Method of fast eliminating solid matter and fluorine in wet method crude phoshporic acid |
-
1972
- 1972-05-04 DE DE19722221745 patent/DE2221745C3/en not_active Expired
-
1973
- 1973-04-19 NL NL7305595A patent/NL7305595A/xx not_active Application Discontinuation
- 1973-04-30 CA CA169,888A patent/CA1001824A/en not_active Expired
- 1973-05-03 GB GB2107973A patent/GB1396217A/en not_active Expired
- 1973-05-04 FR FR7316190A patent/FR2183277B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2183277A1 (en) | 1973-12-14 |
| CA1001824A (en) | 1976-12-21 |
| FR2183277B1 (en) | 1976-11-12 |
| DE2221745B2 (en) | 1980-04-03 |
| DE2221745A1 (en) | 1973-11-15 |
| NL7305595A (en) | 1973-11-06 |
| DE2221745C3 (en) | 1980-11-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |