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Title: Process for manufacturing calcium-sodium-phosphate consisting mainly of Rhenanit and suitable for use as supplementary animal food



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Claims: We claim:

1. In a process for manufacturing calcium-sodium-phosphates consisting mainly of Rhenanit and suitable as supplementary animal food by heating a mixture of crude phosphate, phosphoric acid and sodium hydroxide or sodium compounds with anions, which are volatile under the process reaction conditions, to temperatures not exceeding 1,000.degree.C, the improvement comprising granulating the mixture which contains 1.75 to 2.25 mole CaO and 1.25 to 0.75 mole Na.sub.2 O per mole P.sub.2 O.sub.5, drying the resulting granules, heating the granules for at least 10 minutes, while being subjected to vigorous movement, up to temperatures between 600.degree. to 1,000.degree.C so as to defluorinate the granulated mixture, and finally cooling the granules to room temperature so as to obtain a calcium-sodium-phosphate product having a substantially reduced fluorine content.

2. Process according to claim 1, wherein the granules are heated to a temperature of 800.degree. to 1,000.degree.C.

Other info:


Inventors: Grams, Gerhard (Kleineichen, DT)
Ratajczak, Hans (Cologne, DT)

Application Number: 495817
Filing Date: 1974-08-08
Publication_date: 1976-01-06
Assignee: Chemische Fabrik Kalk GmbH (DT)
Primary Class(es): 426/648 423/308, 423/311, 426/74, 426/465, 426/807
Other Classes:
US Patent Ref:
1902832Mar, 1933Caldwell426/220.
2442969Jun, 1948Butt426/381.
2893834Jul, 1959Richardson423/306.
2997367Aug, 1961Williams423/306.
3058804Oct, 1962Tynan426/220.
3074780Jan, 1963Smalter426/220.
3101999Aug, 1963Malley et al.426/807.
3426837Feb, 1969Conte et al.426/381.
3658549Apr, 1972Geiersberger et al.426/74.
3851086Nov, 1974Baumann426/807.

Other Refs: 635,635
Jan, 1962CA.

Primary Examiner: Lindsay, Jr., Robert L.
Assistant Examiner: Corbin, Arthur L.
Attorney: Laurence, Stokes & Neilan