TVA Development of Pan Granulation Processes for Nitrogen Fertilizers

摘要

TVA pioneered in fertilizer granulation technology in the early 1950's, and as a result nearly all of the granular NPK fertilizers in the United States are now produced by the TVA continuous ammoniator-granulator process. An adaptation of this process, that was developed in pilot-plant work in 1960-61, was rapidly adopted by industry for production of granular diammonium phosphate (DAP) with a grade of 18-46-0. Minor changes in operating technique allow production of monoammonium phosphate (MAP) with a grade of about 10-54-0 or 11-52-0. Ammonium phosphates, produced almost exclusively by the TVA process, became the leading phosphate fertilizer in the United States and the world in the 1970's.