Toyo Engineering Corporation

Klaus Schubel

Tetsuzo Honda

Genshi Nishikawa

Eiji Sakata

Horst Bendix

Heinz Lange

Hans-Joachim Wachsmuth

There is disclosed a process to produce fertilizer granules containing urea and ammonium sulfate with a high ammonium sulfate concentration of &lE;60 wt. % in a fluidized bed granulator, which process comprises the steps of: a) a molten urea suspension consisting of ammonium sulfate having an average particle size of 30 to 300 &mgr;m and urea having a temperature range of 120 to 155&deg; C. is produced, b) the molten urea suspension produced at the stage a) is then injected from below on the fine particles of urea/ammonium sulfate in a fluidized bed granulator by means of at least a nozzle, while the fluidized bed is loosened by a spouting air flow in the injection area, and subsequently, c) the fertilizer granules generated in the fluidized bed are separated and, if necessary, treated. Homogeneous urea/ammonium sulfate granules of an ammonium sulfate content between 30 and 60 wt. % can be produced this way without any problems, while the particle size of granules can be adjusted selectively and dust emissions by granulation can be reduced to a minimum.

Growing community of inventors

Reinsdorf, Germany

Klaus Schubel