Stabilized ammonium nitrate or stabilized products having a high content of ammonium nitrate, and method of producing such products

摘要

The present invention relates to ammonium nitrate or products having a high content of ammonium nitrate stabilized against swelling and break-down by thermal cycling, and a method for manufacturing such products. An amount of 0.05-1.0 weight % porous particles having a surface area of 150-400 m2/g and a pore size of 100-300 ANGSTROM ngströms are included in the products. As porous particles, preferably silicon dioxide particles having a surface area of 250-350 m2/g and a pore size of 100-250 ANGSTROM ngströms are used. The products are made by first drying granulated or prilled ammonium nitrate or products having a high content of ammonium nitrate and thereupon coating them with the porous particles, and if desired also adding a dust-binding agent and/or an anticaking agent. Ammonium nitrate thus conditioned is both as stable and porous as required for use in explosives and in addition it meets the requirements for so-called tropical grade ammonium nitrate. Fertilizers according to the invention, having a high content of ammonium nitrate, will also have an improved caking number and reduced tendency to dust formation because the water present will be bound in the pores of the conditioning agent.