METHOD OF PRODUCING AMMONIUM NITRATE GRANULES BY SPRAYING ITS MELT Russian patent published in 2017 - IPC C01C1/18 B01J2/02 

FIELD: chemistry.

SUBSTANCE: in the method of producing ammonium nitrate granules by spraying its melt in a granulation tower, a closed circulation path of the cooling air upward flow contaminated with pulverized particles of ammonium nitrate is used. The flow leaving the tower heated is cooled in the air cooler without reducing the mass concentration of the pulverized particles of ammonium nitrate therein. The autonomous vapour-air stream coming from the pre-vapour device is first cooled in a cooler-dehumidifier and at the same time the mass concentration of the water vapour contained therein is reduced by condensing it, and then it is mixed with the ascending stream. From the resulting mixed stream, the measuring part is separated to compensate for the replenishment of the closed circulation circuit. The part of the stream remaining after separation is introduced into the lower zone of the tower cavity, where it is mixed with the sucked up atmospheric air. The measuring part of the cooling air, separated from the stream, is sent to the scrubber to trap the dust-like particles of ammonium nitrate and subsequent release into the atmosphere.

EFFECT: ensuring reduced environmental hazard.

1 dwg,1 tbl, 1 ex