METHOD FOR POROUS GRANULATED AMMONIUM NITRATE PRODUCTION Russian patent published in 1994 - IPC

FIELD: explosive production. SUBSTANCE: method involves nitric acid neutralization with the help of ammonia followed by evaporation to produce highly concentrated melt and by adding blowing additives into this melt. Carbamide, soda ash and disperser are used as mentioned above additives, their quantities, mass % are 0.1-0.5, 0.05-0.2 and 0.005-0.2 respectively. NH₄NO₃ solution containing calcium and phosphorous compounds is added before evaporation is carried out, quantities of these compounds being 0.015-0.04 and 0.005-0.03 mass % as calculated for CaO and P₂O₅. Thus prepared material has: absorbing capacity 16 g/100 g, bulk weight 0.71-0.85 g/cm³. EFFECT: increases strength of granules, decreases disperser quantity.