METHOD OF PRODUCTION OF POROUS GRANULATED AMMONIUM NITRATE Russian patent published in 2005 - IPC

FIELD: chemical industry; to the methods of production of the porous granulated ammonium nitrate.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the methods of production of the inorganic substances used in production of explosives, namely, to production of porous granulated ammonium nitrate used in production of the elementary explosives and emulsion explosives. The offered method of production of the porous granular ammonium nitrate provides for production of a solution of ammonium nitrate, injection in the produced solution of ammonium nitrate in terms of CaO in the end product of 0.5-3 mass % of calcium nitrate in the form of 40-70 % water solution, evaporation of the ammonium nitrate solution with production of a fusion cake, injection of a powder-shaped additive and a UF dispersant with the a subsequent granulation of the fusion cake. In the capacity of pore-forming additives use a high concentration solution containing potassium carbonates and-or sodium carbonates, and-or ammonium carbonates in a ratio of carbonate salts in terms of CO₂ in respect to H₂ O, equal to (0.06-0.9) : 1, in amount of 0.01-0.045 mass % in terms of CO₂ in the fusion cake. The invention is intended for development of a method of production of a porous granulated ammonium nitrate with a capability to control oil absorption and strength of granules, which is stabilized against undesirable modification transformations and possesses the heightened thermostability.

EFFECT: the invention ensures production of a porous granulated ammonium nitrate with heightened thermostability and capability to control granules oil absorption and strength, resistance against undesirable modifying transformations.

3 cl, 1 ex