Morphological Features of the Nanoporous Structure in the Ammonium Nitrate Granules at the Final Drying Stage in Multistage Devices.

The article investigates the morphological features of the nanoporous structure in the ammonium nitrate granules obtained by the humidification method, followed by heat treatment, including final drying. The necessity to improve the basic scheme is substantiated using the "humidification-heat treatment" scheme in vortex granulators towards obtaining a developed network of nanopores. A comparative analysis regarding the morphology of the initial granules in ordinary ammonium nitrate, ammonium nitrate after heat treatment, ammonium nitrate after the "humidification-heat treatment" stages in a vortex granulator and ammonium nitrate after the "humidification-heat treatment-final drying" stages in a multistage shelf device is carried out. The obtained data form the basis to create an engineering calculation method for multistage dryers with vertical sectioning of the workspace included to units for producing 3D nanostructured layers on the surface and inside the ammonium nitrate granules. [ABSTRACT FROM AUTHOR]