Procedure to improve the manufacture of nitrogened fertilizer based on ammonium nitrate. (Machine-translation by Google Translate, not legally binding)

摘要

Procedure to improve the manufacture of nitrogen fertilizers based on ammonium nitrate, by neutralizing nitric acid, or their mixtures with sulfuric acid or phosphoric acid with or without salts such as ammonium sulfate and ammonium phosphates present with ammonia vapor, passing the dissolution of ammonium salts produced to an evaporator in which the solution is concentrated, passing to a tank from which it is pumped to a granulator in which the solution is sprayed on a moving bed of fine particles producing granules that pass to a dryer where they are dried by hot air, from which they are sent to a screening section in which the granules whose sizes are within specifications are separated, to pass to a cooler with air from which, once cold, they are sent to a coating drum in which the coating is covered. Surface of the granules with an adsorbent agent, constituting the granules with sizes outside of separate specifications in the screening section, the material that, once ground, is recycled to the granulator to provide the bed of particles on which the concentrated solution of ammonium salts is sprayed, characterized in that the neutralization is carried out at a slight pressure above atmospheric and preferably 1.5 kg/cm2, in a reactor equipped with the convenient means of regulation of pressure and temperature, with the consequent energetic use of the steam produced in the neutralizer. (Machine-translation by Google Translate, not legally binding)