Process for the production of ammonium fluoride from...

Details Process for the production of ammonium fluoride from... Process for the production of ammonium fluoride from...

C - Chemistry, Metallurgy

01

B

23/178

C01B 21/082 (2006.01) C01B 33/18 (2006.01) C01C 1/16 (2006.01)

Patent

CA 1040838

A PROCESS FOR THE PRODUCTION OF AMMONIUM FLUORIDE FROM FLUOSILICIC ACID Abstract In the production of an ammonium fluoride solution by precipitating hexafluosilicic acid from its solution with ammonia and from the resulting suspension separating off the silicon dioxide precipitated, the improvement which comprises thoroughly mixing the hexafluosilicic acid solution and ammonia at a temperature of about 40 to 90°C, in such proportions that the suspension obtained contains at least 1% of free ammonia and at most 22% of ammonium fluoride, the average residence time of the reactants in the precipitation zone being at least 4 minutes. Advantageously, the silicon dioxide is separated off from the suspension obtained without previous cooling, the resulting ammonium fluoride filtrate is left standing for at least 30 minutes to permit flocculation of silicon dioxide contained therein and the flocculated silicon dioxide is separated off.

209539

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