FIELD: manufacture of fertilizers and animal feeds. SUBSTANCE: acid to be purified is thickened by heating attain 58-68 % in terms of P2O5. Impurities are removed from acid by crystallization into compound M2+(H2PO4)2•n•H3PO4, wherein M2+ is divalent metal ion of impurities, and n varies from 2 to 5. Compounds obtained as impurities are useful for industrial use. EFFECT: pure phosphoric acid obtained at low cost. 8 cl, 5 ex, 4 tbl
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