By A.G. Norman (Ed.)
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Additional resources for Advances in Agronomy, Vol. 17
Superphosphoric Acid Developed by TVA as a fertilizer intermediate, superphosphoric acid is a mixture usually containing, at 33 per cent P concentration (76 per cent PpOS), about 50 per cent of its phosphorus in orthophosphoric acid, about 42 per cent in pyrophosphoric acid, and the remainder in higher polymer acids. It is produced either by burning phosphorus followed by limited hydration of the resulting P206 or by concentrating wet-process acid. The wet-process acid is concentrated to superphosphoric acid either by vacuum evaporation with steam or by direct contact with hot combustion gases (Phillips, 1963).
Some 45 countries had urea plants in 1963 including 22 in the United States, 22 in western Europe, and 17 in Japan. Eight were in Communist countries, 6 in Asia, 5 in Latin America, 3 in Canada, and 1in Africa. Not all urea plants in the United States make solid urea, since much of that produced goes into nitrogen solutions. Japan and the United States are the largest consumers of urea, followed by the Republic of Korea, India, Mexico, and Sudan (FAO, 1963). Most of that consumed in the United States is an ingredient of nitrogen solutions.
The phosphate occurs as an oolitic sand in a matrix of phosphatic limestone. Mining is principally underground by the room and pillar method, although open pits are used at one location. R. possesses large reserves of both igneous and sedimentary phosphates. 4 million short tons, comes from the Kola and Kara-Tau deposits. The igneous deposit on the Kola Peninsula near Korovsk has been developed into one of the world's largest sources of phosphate rock. The apatite is mined underground, mainly because of the severity of the winter weather.
Advances in Agronomy, Vol. 17 by A.G. Norman (Ed.)