Merchant Grade Acid (MGA) and Superphosphoric Acid (SPA)

Grades N-P-K

• 0-52-0 (phosphoric acid)
• 0-68-0 (superphosphoric acid)

  Decanted merchant grade

Manufacturing Process -
How we make Merchant Grade Acid (MGA) 0-50-0 and Superphosphoric Acid (SPA) 0-68-0

High-quality phosphate ore is mined in an open pit and processed into a fine powdered rock. The powder is mixed with water, sulphuric acid and a recycled stream of phosphoric acid. The result is a slurry of phosphoric acid and gypsum solids. The
gypsum is filtered from the phosphorus slurry producing 28% phosphoric acid (P₂O₅). This dilute acid is concentrated to 42% by evaporation.Some of this acid is made into granular P fertilizers, the remaining acid is concentrated, some of which is stored and sold as merchant grade acid (50% P₂O₅), the rest into superphosphoric acid (68% P₂O₅).
Superphosphoric acid is further concentrated by evaporation. The concentrated acid is aged in storage tanks.Impurities are removed by filtering. Flowing from the filter presses is a clear green acid that contains 68% P₂O₅. This acid is called superphosphoric acid.

Benefits

• easy and precise application to row crops such as lettuce, soybeans, strawberries and cotton
• high-analysis liquid P source commonly used to make ammonium phosphate solutions
• readily available P source
• can be mixed with other fertilizer solutions
• application flexibility; broadcast, band, starter and fertigation

Production Locations

United States      1. Rasmussen Ridge, Idaho (Mine)  2. Conda, Idaho superphosphoric acid*

* Production is based on market demand.