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For manufacturing purposes the reaction `HNO_3(aq)+NH_3(l)->NH_4NO_3(aq)` is used
Anhydrous ammonia is combined with concentrated nitric acid (don't try this at home). Then the excess water is evaporated off.
The solution is then blown into a tower or rotating drum (depending on desired application) to produce granules which can then be dried and coated if needed.
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