Phosphoric acid (chemical formula H₃PO₄) is a common inorganic acid that appears as colorless, transparent crystals or a viscous liquid at room temperature; it is widely used in fertilizer production, food processing, and industrial applications, and is safe for use in food-grade applications within specified limits.

Product Usage

Phosphoric acid is a vital basic chemical raw material, primarily used in sectors such as agricultural fertilizers, metal surface treatment, chemical product manufacturing, the food industry, electronics and new energy, as well as pharmaceuticals and scientific research.

1. Agriculture: A Key Raw Material for Phosphate Fertilizers

Phosphoric acid is commonly used to produce phosphate fertilizers—such as calcium dihydrogen phosphate (superphosphate) and ammonium phosphates

 (e.g., monoammonium phosphate and diammonium phosphate)—which effectively promote crop growth and increase agricultural yields. Phosphorus is one 

of the three primary nutrients essential for plant growth (alongside nitrogen and potassium) and plays a crucial role in root development, flowering, and fruiting. 

Approximately 80% of global phosphoric acid production is utilized in agriculture, underpinning modern food production systems.

2. Food Industry: Acidity Regulators and Preservatives

Phosphoric acid is widely used in food as an acidity regulator (E338); it imparts a refreshing tartness to beverages (such as cola) and inhibits microbial growth.

 It is also used in products like cheese, meat, and baked goods to improve texture and extend shelf life. Additionally, phosphates (such as sodium tripolyphosphate)

 help retain moisture and enhance tenderness in meat, and are commonly found in processed foods like ham and sausages.

3. Industrial Manufacturing: Metal Processing and Chemical Production

Metal surface treatment: Phosphoric acid is used for rust removal and phosphating (such as forming anti-rust coatings in the automotive and machinery industries).

Detergent production: Sodium tripolyphosphate was once a major ingredient in detergents; although its use has been restricted due to environmental concerns, modified phosphates are still used in industrial cleaning agents.