Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1978-02-17
1979-12-11
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
C01B 2532
Patent
active
041783557
ABSTRACT:
A method of preparing anhydrous dicalcium orthophosphate of predetermined and substantially uniform particle size for use in making fluorescent lamp phosphors. The method entails heating an acidified aqueous slurry of hydrated dicalcium orthophosphate in a reaction vessel and at the same time agitating the heated slurry. The heating and simultaneous agitation is continued until significant incipient formation of a gel-like material is manifested at the wall portions of the reaction vessel. At that point the application of heat to the slurry is discontinued. The agitation of the slurry within the vessel is continued until all the slurry is converted to meta-stable gel-like material. At that time the agitation is discontinued. The formed meta-stable gel-like material is then maintained in a quiescent state until it converts completely to crystals of dicalcium orthophosphate. The orthophosphate crystals are then permitted to settle to the bottom of the residual liquid in the vessel. The settled crystals are then separated from the residual liquid.
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Grasso Giuseppe
Heytmeijer Herman R.
Rusch Larry P.
Langel Wayne A.
Lombard R. S.
Vertiz O. R.
Westinghouse Electric Corp.
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