Process for preparing prilled porous ammonium nitrate

Details Process for preparing prilled porous ammonium nitrate Process for preparing prilled porous ammonium nitrate

C - Chemistry, Metallurgy

01

C

23/205

C01C 1/18 (2006.01) C06B 21/00 (2006.01)

Patent

CA 1064677

ABSTRACT OF THE DISCLOSURE This invention discloses a prilled ammonium nitrate containing 2 to 5% by weight water which is obtained by prilling an aqueous solution of 93 to 98% by weight ammonium nitrate. The nitrate is dried by lowering the drying temperature of the ammonium nitrate to a temperature less than the III-IV crystalline transition temperature of ammonium nitrate at least once when the water content of the prilled ammonium nitrate is 0.3 to 1.5% by weight in the drying step. It is then further dried at a temperature higher than the III-IV transition temperature. An anti-caking agent may be added to the dried prilled ammonium nitrate. The product thus obtained is particularly useful as an ammonium nitrate fuel oil explosive one has overcome the prior art probelems of caking and hardness in an economical and satisfactory manner.

208434

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