SU800132A1 - Method of producing aluminium phosphate fluoride - Google Patents

Description

(54) METHOD FOR PRODUCING PHOSPHATE-FLUORIDE

Xl and the nearest coordination sphere of M ions include ions and, at a molar ratio of the components of FlPOl 1: 1: 1, complexes of the AC-P type are formed (HjPCijJt. The fluorine content in the reaction medium; the medium is 0.7-1.5 mass .%, i.e., corresponds to the concentration of fluorine in the extraction phosphoric acid (ESP. This allows partial purification of EPA from fluorine by precipitating the latter in the form of AEHPO, jF aHjO.

 and meper 1. 100 g of a 6.9% phosphoric acid solution (5 g of P O are placed in a polyethylene fluoroplastic reactor; a stirrer in a thermostat. K te1; a solution of phosphoric acid simultaneously poured at 75 C at the same time 72.0 g 4% aqueous solution of alkali sulphate (C, 52 g AtjO) and; 22.11 11.5% ammonium fluoride solution 1, 31 g to establish in the reaction medium the molar ratio of the components P

“110.98: 1.96. Then the reaction mixture is mixed under these conditions for 4 hours, filtered, washed with water and dried at. The yield of aluminum phosphate fluoride is 7, D3 g (73.80%).

Theoretical: R 10.67%; A1.0, -. 28.65% Pz, 0539.89%.

Experimental: F 10.20%; Al20i 28.50f P ,, 60%.

PRI mme R 2. 100 g of a 13.8% phosphoric acid solution (10 g of P O are placed in a polyethylene reactor with a fluoroplastic agitator in a thermostat. 96.8 g 24 are simultaneously added to a solution of phosphoric acid that is temperature-controlled at 80 C, 8% aqueous solution of aluminum sulfate (7.16 g) and

25.2 g of a 20.6% ammonium fluoride solution (2.67 g P) to establish

in the reaction medium, the molar ratio of the components F. 1: 1: 2. Then the reaction mixture was mixed under the above conditions for 5 hours, filtered, washed with water and dried at 80 ° C. The yield of aluminum phosphate fluoride was 13.41 g (67.05%)

Theoretical: P 10.67%} A I; j0j28, 65%; 89%.

Experimental: F 10.13%; MjQ4 29.15% i P5; 0539.40%.

Froze 100 g of a 27.7% phosphoric acid solution (20 g of Pj C is placed in a polyethylene reactor with a fluoroplastic stirrer in a thermostat. 168.9 g of a 29.4% solution of aluminum sulfate (14 , 81 g of Ab, (() and 41.6 g of a 25.8% solution of ammonium fluoride (5.51 g of P) to establish the molar ratio of components 05: A 1.0: 2.06 in the reaction medium. Then the reaction the mixture is stirred under the above conditions for 5 hours, filtered, washed with water and dried at 8 bs. The output of aluminum phosphate-fluoride is 22.34 g (56.20

Theoretical: P 10.67%, AlaOj, 28.65; Pj05-39, 85%. Experimental: p-10.92%; , 00% -, PjOj- 40.10%.

The proposed method allows to reduce the time of the process to 4-6 hours, to exclude anticorrosive materials in hardware design and to improve the sanitary conditions of labor.

Claims (1)

Invention Formula . A method for producing aluminum phosphate-fluoride by reacting aluminum compounds with aqueous solutions of phosphoric acid and fluorine compounds at elevated temperatures followed by separation of the precipitate from the mother liquor, washing and drying, in order to reduce the time of the process and eliminate dilution operations and evaporation, aluminum sulfate and aluminum sulfate and ammonium fluoride are taken as aluminum compounds and fluorine and the process is carried out at 75-85 ° C at a molar ratio of Al205: PiOg. : F equal to 1: 0.98 + 1.03: 1.96-2.06. Information sources, taken into account in the examination l.New Zealand Journal of Science, 1976, 19.4, 421-431.