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Large Volume Inorganic Chemicals - Ammonia ... - ammk-rks.net

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Chapter 77.4.3 Particle formation (2): drum granulationDescriptionThe NP liquor obtained from neutralisation at approximately 135°C and with a water content ofaround 4 – 12 % is mixed with the required salts and recycled products and is pumped andsprayed into a rotating drum granulator. The water evaporated in the drum is carried away by aco-current flow of air. The granules formed are dried in a rotating drying drum with hot air. Thewater content of the granules is normally below 1.5 %. The air leaving the drums, about 100000Nm 3 /hour for the production of 55 tonnes per hour of NPK 15-15-15, contains water vapour,dust, ammonia and combustion gases. The air from the granulation and drying drums is treatedin high performance cyclones, giving low dust levels (

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