摘要:
Process for scrubbing by means of a liquid the ammonia contained in a vent (in particular the vents of plants for the synthesis and granulation of urea), wherein said liquid is an aqueous solution of urea neutralized with an acid, the pH of said neutralized solution being from 5.0 to 7.0.
摘要:
Disclosed is a process for granulating potassium salts, which comprises:
a) preparing a bentonite gel by mixing (A) bentonite (1) with water (2) in a water:bentonite ratio of from 5:1 to 15:1, and adding a potassium salt (4) to said gel at 60 to 80°C; b) feeding the slurry obtained in step (a) into a rotary drum granulator, in which the slurry (8) is sprayed onto a bed of preformed and recycled hot granules (D), adjusting the moisture content of the granules leaving the granulator (12) in the range of from 4 to 8% and the recycling ratio at from 12:1 to 18:1; c) drying by means of flue gases (E) (at 250-270°C) the granules of step (b) until the moisture content thereof is from 2.0 to 3.5% by weight, the granule temperature at the outlet of the drying zone (15) ranging from 60 to 85°C.