Fertilizer Technology, Development of a One-Step Process for Production of Granular Triple Superphosphate

Fertilizer Technology, High-Analysis Superphosphate by the Reaction of Phosphate Rock with Superphosphoric Acid

“…THE CONVENTIONAL PROCESS for Calcium superphosphate requires acidulation of phosphate rock for the formation of monocalcium phosphate and subsequent curing of the green product for 4 to 6 weeks. To save curing space and time, a quick-curing process (2,4) was developed. To save the mineral acid required in acidulation, experimental work on dicalcium phosphate has been done.…”

Fertilizer Technology, Application of Slurry-Type Processes in the TVA Ammoniator-Granulator

“…Several methods for increasing the water solubility of calcium metaphosphate and adapting it to ammoniation have been studied. In one reported process (4), ground calcium metaphosphate was hydrolyzed partially by treating it with sulfuric acid or phosphoric acid in the feed end of a The use of hot recycle is a definite advantage in the production of grades of fairly high recycle for which higher temperature in the ammoniator is desirable. If the plant is designed for such application, it would be advantageous to screen the product directly from the dryer to allow return of hot recycle, with cooling being confined to the sized product fraction.…”