Production d'Engrais Phosphatés (Superphosphate et DAP)

Libérer le phosphore du sol pour la production agricole mondiale

Agriculture & Fertilizers Global Industrial Scale $25 billion

Aperçu

Phosphate fertilizers are produced by treating phosphate rock (fluorapatite) with sulfuric acid to create single superphosphate (SSP), or with phosphoric acid to create triple superphosphate (TSP) and diammonium phosphate (DAP). Phosphorus is essential for plant energy transfer (ATP), root development, and seed formation. Global phosphate rock reserves are concentrated in Morocco (70%), and concerns about peak phosphorus supply have prompted efforts to improve phosphorus recycling from agricultural and wastewater sources.

Procédé chimique

For SSP: finely ground phosphate rock is mixed with 70% sulfuric acid in a continuous mixer (den process). The mixture sets and cures for 3-6 weeks. For DAP: phosphate rock is digested with sulfuric acid to produce phosphoric acid (wet process), which is then neutralized with ammonia. The slurry is granulated, dried, and screened.

Ca5(PO4)3F + 5H2SO4 + 10H2O -> 3H3PO4 + 5CaSO4.2H2O + HF (wet process for phosphoric acid)
H3PO4 + 2NH3 -> (NH4)2HPO4 (DAP production)

Matières premières

  • Phosphate rock (Ca5(PO4)3F, fluorapatite) — Mining (Morocco, China, US, Russia) (Phosphorus source (30-37% P2O5))
  • Sulfuric acid (H2SO4) — Contact process from sulfur (Acid digestion agent)
  • Ammonia (NH3) — Haber-Bosch process (Nitrogen source for DAP/MAP)

Produits finis

  • Single superphosphate (SSP) — Direct-application phosphorus fertilizer (16-20% P2O5, also provides sulfur and calcium)
  • Diammonium phosphate (DAP, (NH4)2HPO4) — High-analysis NP fertilizer (18% N, 46% P2O5)
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Environmental Impact

Phosphate mining disturbs large land areas and generates phosphogypsum waste (5 tons per ton of P2O5), which contains naturally occurring radioactive materials (NORM). Phosphorus runoff from overfertilized fields causes eutrophication of lakes and rivers. Fluoride and cadmium impurities in phosphate rock require management.

Considérations de sécurité

Innovations récentes

Slow-release phosphorus fertilizers reduce runoff losses.
Phosphorus recovery from wastewater (struvite crystallization) creates a circular economy.
Biochar and mycorrhizal inoculants improve plant phosphorus uptake efficiency, reducing fertilizer requirements.

Échelle de production

50000000

tonnes/an

$25 billion

valeur marchande

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Frequently Asked Questions

What industry uses Production d'Engrais Phosphatés (Superphosphate et DAP)?
Production d'Engrais Phosphatés (Superphosphate et DAP) is used in the agriculture & fertilizers sector at global industrial scale scale.
What process is involved in Production d'Engrais Phosphatés (Superphosphate et DAP)?
For SSP: finely ground phosphate rock is mixed with 70% sulfuric acid in a continuous mixer (den process). The mixture sets and cures for 3-6 weeks. For DAP: phosphate rock is digested with sulfuric acid to produce phosphoric acid (wet process), which is then neutralized with ammonia. The slurry is
What is the economic significance of Production d'Engrais Phosphatés (Superphosphate et DAP)?
Production d'Engrais Phosphatés (Superphosphate et DAP) has a market value of $25 billion and annual production of 50,000,000 tons.
What is the environmental impact of Production d'Engrais Phosphatés (Superphosphate et DAP)?
Phosphate mining disturbs large land areas and generates phosphogypsum waste (5 tons per ton of P2O5), which contains naturally occurring radioactive materials (NORM). Phosphorus runoff from overfertilized fields causes eutrophication of lakes and rivers. Fluoride and cadmium impurities in phosphate
What raw materials are used in Production d'Engrais Phosphatés (Superphosphate et DAP)?
The main raw materials include: Phosphate rock (Ca5(PO4)3F, fluorapatite), Sulfuric acid (H2SO4), Ammonia (NH3).