Document Type and Number:
Japanese Patent JPS5187198
Kind Code:
A
Abstract:
An aqueous slurry of CaHPO4.2H2O in a 5-20 Wt% concentration is prepared by the use of the phosphate dihydrate obtained by reaction of NaNH4HPO4.4H2O with CaCl2 in water. After adjustment of the pH of the slurry to 4.5-5.5, the slurry is rapidly heated to 85 DEG -97 DEG C by contact with steam to convert the dihydrate to the anhydride, which is suitable for use in the preparation of fluorescent materials due to its high purity, platy and square crystal shape and uniform particle size.
Inventors:
ENOMOTO TAKAMITSU
OGURA MOTONARI
ONO TETSUHIRO
OGURA MOTONARI
ONO TETSUHIRO
Application Number:
JP1142475A
Publication Date:
July 30, 1976
Filing Date:
January 29, 1975
Export Citation:
Assignee:
CENTRAL GLASS CO LTD
International Classes:
C01B25/32; C09K11/71; (IPC1-7): C01B25/32