GB1123924A - Improvements relating to the production of phosphoric acid by the wet method - Google Patents
Improvements relating to the production of phosphoric acid by the wet methodInfo
- Publication number
- GB1123924A GB1123924A GB319066A GB319066A GB1123924A GB 1123924 A GB1123924 A GB 1123924A GB 319066 A GB319066 A GB 319066A GB 319066 A GB319066 A GB 319066A GB 1123924 A GB1123924 A GB 1123924A
- Authority
- GB
- United Kingdom
- Prior art keywords
- paste
- h2so4
- temp
- tanks
- h3po4
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Paper (AREA)
Abstract
In a process for the production of CaSO4 and H3PO4 wherein conc H2SO4 and crushed natural phosphate are introduced into a circulating paste of CaSO4 and H3PO4 and part of the paste is continuously withdrawn, the H2SO4 is dispersed into the paste by centrifuging from horizontal slots in the hub of a stirrer. The phosphate may be added immediately before or after the H2SO4. The conditions may be regulated to yield gypsum, a -semihydrate, or anhydrite. If the temp. of the paste immediately after addition of H2SO4 is 70 DEG C., gypsum crystals 200-350m in size are obtained. If this temp. is above 70 DEG C., crystals less than 1m in size of the b semihydrate are formed, and the temp. of the paste is then reduced to 70 DEG C. to give gypsum crystals 800-1000m in size. In Fig. 3 (not shown) phosphate is mixed with recycled paste in tank C1, and passes into H2SO4 dispersing device D1, and thence through crystallizing tanks C2 and C3 to reserve tank C4. Temp. is measured at the outlet of D1 and used to control the amount of paste recycled from C3 to C1. The temp. in C2 is controlled by adding wash water and by recycling part of the paste from C3 through vacuum cooler E. In Fig. 4 (not shown) phosphate and H2SO4 are both fed to tank 6. The H2SO4, and wash water from 24 (via 29) are fed down 2 concentric conduits in the shaft of stirrer 5, into the hub, and emerge separately through horizontal parallel slots between each of the 4 stirrer blades (Fig. 5, not shown). The paste passes from tank 6 to crystallizing tanks 8 and 9, reserve tank 10, and filtration unit 24. Paste is recycled from 9, through vacuum cooler 15, to tanks 6 and 8. The temp. in tanks 6 and 8 is controlled by the rate of flow of recycled paste, or by the introduction of air under pressure into the upper layers of paste. Tanks 6-10 are kept under slight vacuum. The paste may contain 60-70% H3PO4, and the product H3PO4 have a P2O5 content of 30-32%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR4160A FR1462190A (en) | 1965-02-02 | 1965-02-02 | Wet production process for phosphoric acid |
| FR30372A FR88921E (en) | 1965-02-02 | 1965-09-03 | Wet production process for phosphoric acid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1123924A true GB1123924A (en) | 1968-08-14 |
Family
ID=26235595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB319066A Expired GB1123924A (en) | 1965-02-02 | 1966-01-24 | Improvements relating to the production of phosphoric acid by the wet method |
Country Status (11)
| Country | Link |
|---|---|
| BE (1) | BE675507A (en) |
| DE (1) | DE1567802C3 (en) |
| DK (1) | DK119454B (en) |
| FI (1) | FI46616C (en) |
| FR (1) | FR88921E (en) |
| GB (1) | GB1123924A (en) |
| IL (1) | IL25003A (en) |
| LU (1) | LU50331A1 (en) |
| NL (1) | NL149763B (en) |
| NO (1) | NO115995B (en) |
| SE (1) | SE324145B (en) |
-
1965
- 1965-09-03 FR FR30372A patent/FR88921E/en not_active Expired
-
1966
- 1966-01-18 IL IL2500366A patent/IL25003A/en unknown
- 1966-01-21 DE DE1966S0101566 patent/DE1567802C3/en not_active Expired
- 1966-01-24 GB GB319066A patent/GB1123924A/en not_active Expired
- 1966-01-24 BE BE675507D patent/BE675507A/xx not_active IP Right Cessation
- 1966-01-26 LU LU50331A patent/LU50331A1/xx unknown
- 1966-01-26 NL NL6600968A patent/NL149763B/en not_active IP Right Cessation
- 1966-02-01 DK DK50966A patent/DK119454B/en unknown
- 1966-02-01 SE SE125866A patent/SE324145B/xx unknown
- 1966-02-01 FI FI25066A patent/FI46616C/en active
- 1966-02-02 NO NO16153766A patent/NO115995B/no unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE675507A (en) | 1966-07-25 |
| FI46616B (en) | 1973-01-31 |
| IL25003A (en) | 1969-11-12 |
| FI46616C (en) | 1973-05-08 |
| DE1567802A1 (en) | 1970-08-27 |
| DE1567802C3 (en) | 1978-04-13 |
| NO115995B (en) | 1969-01-13 |
| DK119454B (en) | 1971-01-11 |
| NL6600968A (en) | 1966-08-03 |
| FR88921E (en) | 1967-04-14 |
| NL149763B (en) | 1976-06-15 |
| SE324145B (en) | 1970-05-25 |
| LU50331A1 (en) | 1967-07-26 |
| DE1567802B2 (en) | 1977-08-18 |
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