Rock Phosphate

Whistler International Group plays a significant role in supplying high quality Rock Phosphate to major fertilizer manufacturing companies. Our Phosphate Rocks are secured from high quality mines and through strict quality checking process. We ensure consistency in specification in each and every consignment. The Phosphate Rocks are from US, North and West African countries.

Phosphate rock is the only economical source of P for production of phosphate fertilizers and phosphate chemicals. Phosphate rock is produced in some 40countries, but only 12 countries account for 92 percent of the world’s production. Apatite in several different forms is the basic P compound in commercially important deposits of phosphate rock. Phosphorus in apatite minerals is only slightly soluble and of limited availability to crops. However, reactive phosphate rock and partially acidulated phosphate rock are satisfactory sources of P for crops grown on some acid tropical soils. Acidulation or heat treatment of phosphate rock is usually necessary to break the apatite bond to render the contained phosphate more soluble. Wet process sulfuric acid acidulation is the most commonly used technique for improving the agronomic suitability of phosphate rock. The majority of finished P containing materials used in North American agriculture are made from wet process phosphoric acid. Phosphoric acid is made from the reaction of sulfuric acid with phosphate rock.

Phosphorus is also a component of phytin, a major storage form of P in seeds. About 50 percent of the total P in legume seeds and 60 to 70 percent in cereal grains is stored as phytin or closely related compounds. An inadequate supply of P can reduce seed size, seed number, and viability.