Feed Monocalcium Phosphate Derived from Wet-process Phosphoric Acid and Calcium-based Raw Materials
Abstract
In this study, granulated feed-grade monocalcium phosphate was produced using highly purified wet-process phosphoric acid (WPA) and finely milled limestone (99.5% CaCO3). The WPA was desulfated to 0.09–0.14% SO₃, defluorinated to 0.18–0.20% F, and concentrated to 50.55% P₂O₅. Under controlled conditions—achieving a 95% reaction rate and a 15-minute decomposition time—a high-quality product was obtained. The final composition included 50.45% digestible P₂O₅, 38.02% water-soluble P₂O₅, 21.14% total CaO, and 14.39% water-soluble CaO, with a fluoride content of 0.16%. The granules achieved 2.13 MPa in strength, with over 85% in the optimal 2-3 mm size range, meeting GOST 23999-80 standards. This phosphate supplement offers high bioavailability for livestock, poultry, and aquaculture.