METHOD OF PRODUCING DICALCIUM PHOSPHATE Russian patent published in 2012 - IPC C01B25/32 C05B3/00 

FIELD: chemistry.

SUBSTANCE: invention can be used to produce mineral supplements for animal feed. The method of producing dicalcium phosphate involves mixing wet-process phosphoric acid with limestone at 60-80°C in non-recycle mode in two series-connected double-shaft mixers for 4-8 minutes while adding an absorptive liquid in amount of 40-70% of the weight of limestone. Further, the product undergoes ageing and drying with furnace gases at 120-145°C to residual moisture content of 1.5-2.5%. The absorptive liquid obtained during wet scrubbing of exhaust gases from the drying step undergoes preliminary settling, sludge is separated and the clarified part is returned into the mixer for the mixing step.

EFFECT: invention reduces content of fluorine in dicalcium phosphate while zero-discharge of the process.

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