GB391495A - Improvements in or relating to the production of mono-calcuim phosphate and di-calcium phosphate - Google Patents
Improvements in or relating to the production of mono-calcuim phosphate and di-calcium phosphateInfo
- Publication number
- GB391495A GB391495A GB30131/31A GB3013131A GB391495A GB 391495 A GB391495 A GB 391495A GB 30131/31 A GB30131/31 A GB 30131/31A GB 3013131 A GB3013131 A GB 3013131A GB 391495 A GB391495 A GB 391495A
- Authority
- GB
- United Kingdom
- Prior art keywords
- phosphate
- solution
- dicalcium phosphate
- added
- ammonium nitrate
- 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
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B11/00—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes
- C05B11/04—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid
- C05B11/06—Fertilisers produced by wet-treating or leaching raw materials either with acids in such amounts and concentrations as to yield solutions followed by neutralisation, or with alkaline lyes using mineral acid using nitric acid (nitrophosphates)
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Materials For Medical Uses (AREA)
Abstract
Dicalcium phosphate, and optionally monocalcium phosphate, are obtained by extracting tricalcium phosphate with sufficient nitric acid to produce a phosphoric acid concentration in the mixture such that monocalcium phosphate is capable of existing therein in the solid phase, partially neutralizing the resulting solution, which may contain solid monocalcium phosphate, by adding di- or tricalcium phosphate or both, and treating the magma thus produced with ammonia so as to precipitate successively mono- and dicalcium phosphate, the separation of the former being optional, but being effected, if at all, when the concentration of the mother liquor is just above the equilibrium point between the two solid phases, mono- and dicalcium phosphate. A preferred temperature range of 30-75 DEG C. is specified. The use of a 40 per cent or stronger nitric acid is desirable, and in such case, the magma or mother liquor is diluted before precipitation of dicalcium phosphate with water, or preferably with the calcium nitrate-ammonium nitrate or ammonium nitrate solution obtained in the process. The ammonia may be added dissolved in this diluting liquor, or be diluted with an inert gas, the mixture being forced into the air-filled space above the level of the liquid contained in an agitated closed vessel, or be passed in small bubbles through the liquor. Preferably when the ammoniation is half completed, sodium silicate may be added. The raw phosphate should be added to the acid, and when the solution is nearly saturated with monocalcium phosphate, gangue may be filtered off, and the remainder of the phosphate then added. Dicalcium phosphate separated in the last stage of the process may be returned for use in the initial partial neutralization of the acid solution; the ammonium nitrate-calcium nitrate mother liquor obtained on separation of the dicalcium phosphate may be treated with ammonia and carbon dioxide, or ammonium carbonate, bicarbonate or carbamate. The resulting ammonium nitrate solution is concentrated, and may then be admixed with the calcium carbonate produced, and granulated, for example by stirring or spraying. In the Specification as open to inspection under Sect. 91 the initial partial neutralization of the acid solution with di- or tricalcium phosphate or both is not essential.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US391495XA | 1930-10-31 | 1930-10-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB391495A true GB391495A (en) | 1933-05-01 |
Family
ID=21903919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB30131/31A Expired GB391495A (en) | 1930-10-31 | 1931-10-30 | Improvements in or relating to the production of mono-calcuim phosphate and di-calcium phosphate |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB391495A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2609271A (en) * | 1941-09-25 | 1952-09-02 | Directie Staatsmijnen Nl | Production of calcium phosphates and calcium nitrate |
US2673796A (en) * | 1950-12-27 | 1954-03-30 | Ici Ltd | Fertilizers |
US2673795A (en) * | 1950-09-12 | 1954-03-30 | Ici Ltd | Phosphate fertilizers |
US2753252A (en) * | 1952-03-22 | 1956-07-03 | Monsanto Chemicals | Fertilizer manufacture |
US2879153A (en) * | 1951-11-07 | 1959-03-24 | Tennessee Valley Authority | Production of fertilizer |
US2882127A (en) * | 1958-05-14 | 1959-04-14 | Int Minerals & Chem Corp | Granular dicalcium phosphate product and method for the production thereof |
US3245777A (en) * | 1963-01-10 | 1966-04-12 | Pullman Inc | Method of making phosphate fertilizer |
DE1282620B (en) * | 1965-10-19 | 1968-11-14 | Kalk Chemische Fabrik Gmbh | Process for the production of practically fluorine-free dicalcium phosphate |
US3619162A (en) * | 1968-04-05 | 1971-11-09 | Basf Ag | Production of and application to soil suspension fertilizers from nitric acid solutions of phosphate rock |
-
1931
- 1931-10-30 GB GB30131/31A patent/GB391495A/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2609271A (en) * | 1941-09-25 | 1952-09-02 | Directie Staatsmijnen Nl | Production of calcium phosphates and calcium nitrate |
US2673795A (en) * | 1950-09-12 | 1954-03-30 | Ici Ltd | Phosphate fertilizers |
US2673796A (en) * | 1950-12-27 | 1954-03-30 | Ici Ltd | Fertilizers |
US2879153A (en) * | 1951-11-07 | 1959-03-24 | Tennessee Valley Authority | Production of fertilizer |
US2753252A (en) * | 1952-03-22 | 1956-07-03 | Monsanto Chemicals | Fertilizer manufacture |
US2882127A (en) * | 1958-05-14 | 1959-04-14 | Int Minerals & Chem Corp | Granular dicalcium phosphate product and method for the production thereof |
US3245777A (en) * | 1963-01-10 | 1966-04-12 | Pullman Inc | Method of making phosphate fertilizer |
DE1282620B (en) * | 1965-10-19 | 1968-11-14 | Kalk Chemische Fabrik Gmbh | Process for the production of practically fluorine-free dicalcium phosphate |
US3619162A (en) * | 1968-04-05 | 1971-11-09 | Basf Ag | Production of and application to soil suspension fertilizers from nitric acid solutions of phosphate rock |
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