Method for preparing dicalcium orthophosphate for use in fluores

Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing

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C01B 2532

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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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patent: 3395979 (1968-08-01), Schafer
patent: 3420625 (1969-01-01), Margolis
patent: 3864274 (1975-02-01), Heytmeijer
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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