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| Name | Current message text |
|---|---|
| h English (en) | ===NPK fertilizers=== {{main|NPK fertilizer}} There are three major routes for manufacturing NPK fertilizers (named for their main ingredients: nitrogen (N), phosphorus (P), and potassium (K)): # bulk blending. The individual fertilizers are combined in the desired nutrient ratio. {| class="wikitable" |+ Bulk blending. Ingredient kg/ton |- ! Blend ingredient !! NPK 17-17-17 !! NPK 19-19-19 !! NPK 9-23-30 !! NPK 8-32-16 |- | ammonium nitrate || 310 || || || |- | urea || || 256 || || |- | diammonium phosphate (DAP) ||376 ||421 || 500||462 |- | triple superphosphate || || || ||261 |- | potassium chloride || 288 || 323 || 500 || 277 |- | filler || 26|| || || |} # The wet process is based on chemical reactions between liquid raw materials [[phosphoric acid]], [[sulfuric acid]], [[ammonia]]) and solid raw materials (such as [[potassium chloride]]). *The Nitrophosphate Process. Step 1. Nitrophosphates are made by acidiculating [[phosphate rock]] with [[nitric acid]]. *Nitric acid + Phosphate rock → [[Phosphoric acid]] + [[Calcium sulfate|Calcium sulphate]] + [[hexafluorosilicic acid]]. *Ca<sub>5</sub>F(PO<sub>4</sub>)<sub>3</sub> + 10 HNO<sub>3</sub> →6 H<sub>3</sub>PO<sub>4</sub> + 5 Ca(NO<sub>3</sub>)<sub>2</sub> + HF *6 HF + SiO<sub>2</sub> →H<sub>2</sub>SiF<sub>6</sub> + 2 H<sub>2</sub>O |