Phosphate rock is a major dry bulk cargo, with global seaborne trade of approximately 30 to 35 million tonnes per year. It is the principal feedstock for phosphate fertilizer production worldwide and moves from a small number of major exporting regions including Morocco, the United States, Russia, China, Saudi Arabia, and Jordan to fertilizer-manufacturing markets globally. The IMSBC Code regulates phosphate rock shipments and includes separate schedule entries for the principal commercial forms.
Schedule structure
The IMSBC Code includes the following schedule entries for phosphate rock and derived products:
- Phosphate rock (calcined): heat-treated phosphate rock with reduced moisture and improved flowability. Group C (not liquefiable, no chemical hazard).
- Phosphate (defluorinated rock): phosphate rock processed to remove fluorine for animal feed applications. Group C.
- Phosphate rock: untreated mined phosphate rock with variable moisture content. Group A (potentially liquefiable) where fines and moisture exceed limits, otherwise Group C.
Most modern seaborne phosphate rock trade is calcined or partially dried product handled as Group C. Wet ground phosphate concentrate from some producers may fall into Group A and require pre-loading TML and MC certification.
Cargo properties
Phosphate rock is a sedimentary or igneous mineral consisting principally of fluorapatite (Ca5(PO4)3F) and similar calcium phosphate minerals, often with additional gangue minerals including silica, calcite, and clay. Moroccan and Saudi phosphate rock from sedimentary deposits has been the dominant commercial source for several decades, with US Florida and North Carolina production declining significantly since the 1990s. Russian and Kazakh phosphate from igneous deposits has higher grade and lower fluorine content but smaller commercial volumes.
Bulk density of phosphate rock concentrate is approximately 1.5 to 1.9 tonnes per cubic metre, with stowage factor of approximately 0.55 to 0.7 cubic metres per tonne. Particle size depends on product form, ranging from fine concentrate (below 100 micrometres) to coarse pellets and granules (1 to 5 millimetres) for direct application.
Cargo handling concerns
Phosphate rock is non-toxic and non-flammable and does not pose chemical hazards comparable to ammonium nitrate or sulphur. The principal handling concerns are:
- Dust generation: fine phosphate rock generates significant dust during loading and discharge, which is a respiratory hazard and an environmental concern at port. Modern terminals use enclosed conveyor systems with dust collection.
- Liquefaction risk in fines: where the cargo is wet ground concentrate with high fines content, the Group A liquefaction risk applies. The Proctor-Fagerberg test or similar TML methods determine the safe moisture limit.
- Compatibility with steel: phosphate rock is benign to steel; no special hold preparation is required other than cleanliness.
Major exporters
Morocco (through OCP, the state mining group) is the dominant global phosphate rock exporter, accounting for approximately 30 per cent of global seaborne trade. Moroccan phosphate moves through the ports of Casablanca, Jorf Lasfar, and Safi. Most modern Moroccan exports are partially processed phosphoric acid or phosphate fertilizers rather than raw rock, but rock exports remain significant.
Other major exporters:
- United States (Florida, increasingly small but still active).
- Russia (Murmansk, Sankt-Peterburg ports).
- China (declining export, increasing internal consumption).
- Saudi Arabia (Ma’aden Phosphate Company production from Al Jalamid deposit).
- Jordan (Aqaba export of state-owned Jordan Phosphate Mines Company production).
- Egypt and Tunisia (Mediterranean exports to European fertilizer markets).
Receiving regions
Phosphate rock seaborne imports go principally to:
- India (Krishnapatnam, Paradip ports), the world’s largest phosphate fertilizer importing nation.
- Brazil (Vitória, Santos), with significant domestic fertilizer manufacturing.
- North America (US Gulf Coast, Atlantic, and Canadian terminals).
- Europe (various Mediterranean and North Sea ports).
- North Africa and West Africa.
Loading and discharge
Loading is by shore conveyor and shiploader. Hold preparation is straightforward: clean, dry, and free of incompatible cargo residues. Bilge wells should be inspected and dried. The cargo self-trims for fine concentrate and may require some trimming for granular product.
Discharge is by grab-fitted shore cranes or pneumatic unloaders at receiving terminals. Some major fertilizer plants have dedicated berths with covered conveyor systems for direct delivery to shore silos.