Feed phosphates

Feed phosphates denote phosphorus salts intended for animal nutrition and, to a lesser extent, beverage acidification and the preparation of foodstuffs meeting specific quality criteria. These compounds belong to a separate supply chain from phosphate fertilisers, as they demand markedly higher levels of purity and stricter sanitary specifications. Phosphorus and calcium are essential macro-minerals for healthy, productive growth in livestock^[1].

Manufacture and grades

The production of feed phosphates relies on phosphoric acid, whose typical commercial concentration lies between 52% and 54% P₂O₅^[2]. Food-grade acid, obtained through advanced purification of wet-process phosphoric acid or via the thermal route, is employed for beverage acidification and the manufacture of food-grade phosphate salts^[2]. Purification processes remove contaminants such as cadmium, arsenic and fluorine, whose levels are regulated in the European Union by legislation separate from the Fertilising Products Regulation^[3][4].

Animal feed phosphates occur chiefly as calcium, sodium or ammonium salts. In the United States, over 95% of phosphate rock mined supplies the manufacture of wet-process phosphoric acid and superphosphoric acid, which serve as intermediates for producing granular or liquid ammonium phosphate fertilisers, as well as animal feed supplements^[5]. DAP and MAP fertilisers and feed phosphates therefore share a common industrial origin, yet the latter undergo additional refining stages to achieve the requisite purity.

Applications in animal nutrition

In livestock farming, feed phosphates satisfy requirements for phosphorus and calcium, elements that form bone structure and participate in numerous metabolic functions. They are incorporated into industrial premixes or distributed as mineral supplements. The amino acid industry for animal feed represents another indirect outlet, with ammonia serving as a raw material for the fermentation producing lysine, methionine and threonine—essential amino acids that enable reduced overall inclusion of vegetable proteins in rations^[1].

Phosphates also contribute to the ionic balance of rations and to optimising feed conversion. Their bioavailability varies according to chemical form: monocalcium and dicalcium phosphates generally exhibit higher assimilation rates than raw phosphate rock, which is not permitted in animal feed under many regulatory regimes.

Market and regulation

Global consumption of phosphoric acid is divided approximately 80% for fertilisers and 8% for animal feed supplements^[2]. This proportion, established during the 2000s, is shifting under the influence of population growth and the intensification of livestock rearing in emerging economies. Worldwide phosphoric acid production capacity reached 41,600 kt in 2004^[2].

The European Union strictly governs feed phosphates through sanitary regulations distinct from those applying to fertilisers. The European Commission's BREF document on large-volume inorganic acid industries expressly excludes food-grade phosphate production from its scope^[3]. The Fertilising Products Regulation sets limits for contaminants in foodstuffs and animal feed with reference to several Community texts, including Regulation (EC) No 396/2005 on pesticide residues and Directive 2002/32/EC on undesirable substances in animal feed^[4]. Cadmium thresholds in fertilisers, a recurrent subject of debate in Europe, do not directly concern feed phosphates, which are subject to more stringent requirements through animal feed legislation.

Feed phosphate prices track the market trend for merchant phosphoric acid and phosphate rock, with a purification premium that fluctuates according to energy costs and investment in filtration and refining. United States merchant phosphate rock production was estimated at 20 Mt in 2025, with an average value of approximately 100 USD/t FOB mine^[5].