Using phosphate rock slurry decomposed by sulfuric acid as the liquid raw material, compound fertilizer was produced through ammoniation and granulation in the rotary drum granulator. The technology can effectively use trace nutrient elements in the phosphate rock, such as calcium, magnesium, sulfur, iron, etc. and reduce the environmental pollution caused by phosphorus gypsum in the production of phosphoric acid. The pilot of 15-15-15MOP urine based fertilizer and conventional fertilizer were applied to field fertilizer experiment on peanut, production increased significantly.
