Process for preparing calcium fluoride from fluosilicic acid

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United States of America Patent

PATENT NO 11873229
APP PUB NO 20180155207A1
SERIAL NO

15568089

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Abstract

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A process for preparing synthetic calcium fluoride (CaF2) (min 90% CaF2 by weight) from fluosilicic acid is provided. The processes comprises the steps of (a) reacting fluosilicic acid (H2SiF6) with ammonium hydroxide or ammonia in a first reactor so as to obtain a first slurry and filtering the first slurry so as to obtain a filtrate containing a solution of ammonium fluoride (b) precipitating the solution of ammonium fluoride with calcium in a second reactor so as to produce a second slurry containing calcium fluoride and (c) evolving the major part of ammonia from the second reactor and then scrubbing and returning said ammonia to the first reactor.

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Patent Owner(s)

Patent OwnerAddress
OCP SAHAY ERRAHA RUE AL ABTAL NO 2-4 CASABLANCA 20200

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kossir, Abdelaali El Jadida, MA 2 3
Samrane, Kamal Casablanca, MA 3 3

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