METHOD OF OBTAINING OF FORAGE DICALCIUMPHOSPHATE Russian patent published in 2015 - IPC C01B25/32 C05B3/00 

FIELD: chemistry.

SUBSTANCE: method of obtaining forage dicalciumphoshate includes addition to extraction phosphoric acid, which contains 45-52% P₂O₅, of 1.5-4% sulphuric acid counted per SO₃, 0.5-0.9% of iron compounds counted per Fe₂O₃, 0.8-1.2% of aluminium compounds counted per Al₂O₃, not more than 0.2% of fluorine compounds, of clarified absorption liquid until mixture density is 1.42-1.44 g/cm³, following mixing of mixture of extraction phosphoric acid and absorption liquid with limestone at 60-80°C in returnless mode in two successively connected twin-shaft mixers for 4-8 min, maturation and drying of product by furnace gases at 120-145°C to residual moisture content 1.5-2.5% with obtaining product, which contains 8-20% of dihydroorthophosphate of calcium Ca(H₂PO₄)₂ and 5-10% of calcium carbonate CaCO₃.

EFFECT: invention makes it possible to obtain forage dicalciumphosphate, answering requirements of GOST 23999 and TU 2182-416-00209438, from extraction phosphoric acid.

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