Process of preparing calcium hydrogen phosphate anhydride suitab

Details Process of preparing calcium hydrogen phosphate anhydride suitab Process of preparing calcium hydrogen phosphate anhydride suitab

1978-08-08

1980-05-20

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

C01B 2532

Patent

active

042039550

ABSTRACT:
A process of preparing calcium hydrogen phosphate anhydride suitable as a raw material for phosphate phosphors, wherein CaHPO.sub.4.2H.sub.2 O is precipitated by mixing aqueous solutions of NaNH.sub.4 HPO.sub.4.4H.sub.2 O and CaCl.sub.2.6H.sub.2 O at 5.degree.-40.degree. C. An entire quantity of CaHPO.sub.4.2H.sub.2 O to be converted to CaHPO.sub.4 in one batch is put into an acidified water maintained above 80.degree. C. all at once. Crystalline CaHPO.sub.4 is obtained through agitation of a resultant hot slurry for a few minutes. Crystal habit of the product depends on the pH of the hot water: lozenge-shaped plates when the pH is below 3.4, parallelogram plates in the pH range of 3.4-4.4, and square or rectangular plates when the pH is above 4.4. The particle size of CaHPO.sub.4 depends on the water temperature and the degree of agitation. To precipitate CaHPO.sub.4.2H.sub.2 O in the presence of suitable quantity of seed crystals is effective for minimizing the Na content of CaHPO.sub.4.

REFERENCES:
patent: 3095269 (1963-06-01), Chiola et al.
patent: 3420625 (1969-01-01), Margolis
patent: 3927180 (1975-12-01), Chenot
patent: 3940343 (1976-02-01), Demarest et al.
patent: 4044105 (1977-08-01), Enomoto et al.

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