The influencing factors of crystal size are analyzed according to the ammonium sulfate crystallization principle and crystallization growth environment,combined with the current situation of the evaporating crystallization system,the auxiliary water charging system is optimized and increased according to the dissolution characteristics of ammonium sulfate,the following methods are adopted,addition of water to displace ammonium sulfate solution as per 1∶1 proportion,to dissolve and remove fine particles for 4 h,55％～60％powder crystals that the particle size under 0.5 mm can be removed effectively,the crystal products that the particle size over 1 mm was increased from 20％to 50％,at the same time,the plugging problem occurred in operation of heating tubes are solved.
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