CH162159A - A method of manufacturing lime phosphate with a high content of water soluble phosphoric acid. - Google Patents
A method of manufacturing lime phosphate with a high content of water soluble phosphoric acid.Info
- Publication number
- CH162159A CH162159A CH162159DA CH162159A CH 162159 A CH162159 A CH 162159A CH 162159D A CH162159D A CH 162159DA CH 162159 A CH162159 A CH 162159A
- Authority
- CH
- Switzerland
- Prior art keywords
- phosphate
- phosphoric acid
- lime
- high content
- water soluble
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B1/00—Superphosphates, i.e. fertilisers produced by reacting rock or bone phosphates with sulfuric or phosphoric acid in such amounts and concentrations as to yield solid products directly
- C05B1/04—Double-superphosphate; Triple-superphosphate; Other fertilisers based essentially on monocalcium phosphate
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
Procédé de fabrication de phosphate de chaux à haute teneur en acide phosphorique soluble dans l'eau. On obtient généralement le phophate de chaux à haute teneur en acide phosphorique soluble dans l'eau en attaquant le phosphate tricalcique naturel finement pulvérisé par de l'acide phosphorique dilué. On obtient ainsi une pâte que l'on dessèche et broie.
Suivant le procédé qui fait l'objet du présent brevet, on fabrique du phosphate de chaux à haute teneur en acide phosphorique soluble dans l'eau, en employant un acide concentré contenant 850 à 900 gr d'anhydride phosphorique par litre et en le faisant réagir avec malaxage sur du phosphate tricalcique naturel dont la composition granulométrique est établie de façon que la prise en masse du mélange n'ait lieu qu'après un malaxage de durée suffisante pour assurer l'homogénéité de l'attaque,
les quantités d'acide phosphorique et de phosphate naturel étant calculées de façon que la chaux à l'état de phosphate et à l'état de carbonate du phosphate naturel soit entièrement transformée en phosphate de chaux soluble dans l'eau. Si les grains de phosphate naturel sont trop gros, l'acide ne peut les pénétrer jus qu'au coeur, s'ils sont trop petits, le mélange se prend en mottes qui renferment un excès d'acide alors que le reste du phosphate naturel échappe à la réaction.
Pour les phosphates de Gafsa, par exem ple, il faut que les grains passent au tamis de 900 mailles au centimètre carré, et soient retenus par le tamis de 2000 mailles au centimètre carré.
Dans ces conditions, on obtient un pro duit à haut titre en acide phosphorique soluble dans l'eau. Au bout de 48 heures au grand maximum, ce produit se présente sous forme d'une masse absolument sèche, qui peut être aussitôt broyée et ensachée.
La température de la réaction ne dépasse pas 70 et l'on n'observe aucun dégagement de l'acide fluorhydrique contenu dans le phos phate tricalcique naturel.
A method of manufacturing lime phosphate with a high content of water soluble phosphoric acid. Water soluble high phosphoric acid lime phosphate is generally obtained by attacking the finely pulverized natural tricalcium phosphate with dilute phosphoric acid. A paste is thus obtained which is dried and ground.
According to the process which is the subject of the present patent, lime phosphate with a high content of phosphoric acid soluble in water is produced, by employing a concentrated acid containing 850 to 900 g of phosphoric anhydride per liter and by making it react with kneading on natural tricalcium phosphate, the particle size composition of which is established so that the mixture sets in mass only after kneading for a sufficient duration to ensure the homogeneity of the attack,
the quantities of phosphoric acid and of natural phosphate being calculated so that the lime in the phosphate state and in the carbonate state of natural phosphate is entirely transformed into water-soluble lime phosphate. If the grains of natural phosphate are too large, the acid cannot penetrate them right through to the heart, if they are too small, the mixture forms lumps which contain an excess of acid while the rest of the natural phosphate escapes reaction.
For Gafsa's phosphates, for example, the grains must pass through a 900 mesh per square centimeter sieve and be retained by the 2000 mesh per square centimeter sieve.
Under these conditions, a product with a high phosphoric acid content which is soluble in water is obtained. After 48 hours at the most, this product is in the form of an absolutely dry mass, which can be immediately crushed and bagged.
The reaction temperature does not exceed 70 and no evolution of the hydrofluoric acid contained in the natural tricalcium phos phate is observed.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH162159T | 1932-06-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH162159A true CH162159A (en) | 1933-06-15 |
Family
ID=4415379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH162159D CH162159A (en) | 1932-06-15 | 1932-06-15 | A method of manufacturing lime phosphate with a high content of water soluble phosphoric acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH162159A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1081481B (en) * | 1955-03-29 | 1960-05-12 | Lummus Co | Process for the preparation of double or triple superphosphates |
-
1932
- 1932-06-15 CH CH162159D patent/CH162159A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1081481B (en) * | 1955-03-29 | 1960-05-12 | Lummus Co | Process for the preparation of double or triple superphosphates |
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