反应详情

The process for the manufacture of granular diammonium phosphate according to the present invention is defined by the appended claims with specific embodiments shown in the attached drawing. For purposes of summarizing the invention, the invention relates to a process for the manufacture of solid diammonium phosphate having granular particle size in a range of 2 mm to 4 mm where about 75 to 85 percent of the granules produced are in a range of the desired granule size of 2 mm to 4 mm. The solid granular diammonium phosphate is prepared by reacting anhydrous ammonia with phosphoric acid in a reactor to form a partially reacted aqueous slurry of monoammonium phosphate and diammonium phosphate. The partially reacted slurry is pumped to a granulator-reactor and further reacted with anhydrous ammonia to form a moisture containing solid granular diammonium phosphate mixture having a range of particle sizes consisting of oversize, undersize and product. The moisture containing solid granular diammonium phosphate mixture is introduced to a dryer dried. Upon discharging the drier a portion of the dried solid granular diammonium phosphate mixture is diverted back to the granulator-reactor. The portion not diverted is separated or classified by a separating means to separate the oversize and undersize from the desired product size diammonium phosphate. Separation is attained by setting to a narrow size separation (difference between oversize and product screen) an oversized screen to separate oversized granular particles and a product screen to separate undersized granular particles from the product granular particles. The oversize product granular particles are milled and recycled along with the undersized granular particles obtained during the classifying process to the granulator-reactor. The desired granular product is collected wherein about 90% of the granules collected by the classifying means are in a range of the desired granule size of 2 mm to 4 mm and about 10% of the granules collected by the classifying means are off size (roughly about 2% oversize and 8% undersize) where 40% of the dryer discharge is diverted to the granulator-reactor and the screens are set at +5 oversize and +7 product.

1. customproduced
2. customThe solid granular diammonium phosphate is prepared