Feed Monocalcium Phosphate Derived from Wet-process Phosphoric Acid and Calcium-based Raw Materials
Khoshimov Ilkhomjon Erkin Ugli
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
Turdialieva Shakhzoda Ismatullaevna *
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
Seytnazarov Atanazar Reypnazarovich
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
Namazov Shafaat Sattarovich
Institute of General and Inorganic Chemistry, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan.
Kholmurodov Jamshidbek Erkinovich
Namangan Institute of Engineering and Technology, Namangan, Uzbekistan.
*Author to whom correspondence should be addressed.
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.
Keywords: Wet-process phosphoric acid (WPA), raw materials, calcium, decomposition, retur, monocalcium phosphate (MCP), granulation, desulfurization