The phosphate rock is initially converted to phosphoric acid (P2O5) by reaction with sulfuric acid. The phosphoric acid is further processed to produce fertilizers, food-grade and feed-grade additives, and detergents. Other marginal applications include metal surface treatment, corrosion inhibition, flame retardants, water treatment, and ceramic production. Despite such widespread use, the latter applications represented only ^3% of the total consumption of various phosphates in the 1990s.
The global consumption of all phosphate fertilizers surpassed 1 MMT Pyr- during the late 1930s. After reaching 14 MMT P yr-1 in 1980, the world consumption of phosphate fertilizers has been relatively stable. It was 14.8 MMT P (34 MMT P2O5) in statistical year 2002-03, and slightly decreased to 13.8 MMT P (31.5 MMT P2O5) in statistical year 2003-04, roughly accounting for 72.8% of the global extraction of phosphate rock. The top three economies, including China, the United States, and India, accounted for one-half of the world consumption. The area of the world current crop land is about 1.4 billion ha, implying that the global fertilizer application intensity averages 10 kg P ha- . The application rate varies significantly among continents, ranging from about 3 kgP ha-1 in Africa to over 25 kgPha-1 in Europe. Among Western Europe countries, application levels range from 8.7 kgPha-1 in Denmark and Sweden to 34kgP ha-1 in Ireland.
Was this article helpful?
You Might Start Missing Your Termites After Kickin'em Out. After All, They Have Been Your Roommates For Quite A While. Enraged With How The Termites Have Eaten Up Your Antique Furniture? Can't Wait To Have Them Exterminated Completely From The Face Of The Earth? Fret Not. We Will Tell You How To Get Rid Of Them From Your House At Least. If Not From The Face The Earth.