Process for producing aluminum fluoride particles

Details Process for producing aluminum fluoride particles Process for producing aluminum fluoride particles

1997-11-14

2000-06-27

Nguyen, Ngoc-Yen

Chemistry: physical processes

Physical processes

Crystallization

423489, 23305A, C01B 908

Patent

active

060802103

ABSTRACT:
A process for producing aluminum fluoride particles having a smooth surface, comprising the steps of adding aluminum fluoride seed crystals to a super-saturated solution of aluminium fluoride; allowing aluminum fluoride particles to be precipitated under heating and agitation; collecting the aluminium fluoride particles by filtration; and drying them, wherein: a super-saturated solution of aluminium fluoride containing 0.6 to 1.3 wt % of fluosilicic acid which is preferably obtained by reacting aluminum hydroxide with fluosilicic acid in an [Al(OH).sub.3 /H.sub.2 SiF.sub.6 ] molar ratio of 1.80 to 1.90 is used as the crystallization mother liquor.

REFERENCES:
patent: 3057681 (1962-10-01), Gernes et al.
patent: 3887693 (1975-06-01), Escribano Nevado et al.
patent: 3958147 (1976-05-01), Becker et al.
patent: 4238469 (1980-12-01), Schmidt et al.
patent: 5707406 (1998-01-01), Asano et al.

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