Effect of different addition amount of ammonium polyphosphate on granulation performance of compound fertilizer
Ammonium polyphosphate(APP),as a new type of fertilizer that has attracted much attention in recent years,has been studied more in agricultural applications with remarkable effects,but less research has been reported as a raw material in the production of compound fertilizers.In order to investigate the compounding and granulation performance of APP with other fertilizers,the APP,monoammonium phosphate(MAP),diammonium phosphate(DAP)and other raw materials were used to prepare compound fertilizers by compounding and then granulation.Two schemes were designed for the preparation of fertilizers,in which Scheme Ⅰ was based on APP,MAP,urea and K2SO4 as raw materials,and Scheme Ⅱ was based on APP,DAP,urea and K2SO4 as raw materials,and the two schemes were set with different APP additions as variables,and the compositions of the raw materials,the phenomenon of the granulation process,the amount of water added,the rate of granulation,the pH of the fertilizer,the strength of the particles,particle dispersion,and the moisture absorption of the fertil-izer,etc.,were investigated.Fertilizer hygroscopicity and other granulation properties were evaluated.The results showed that APP compounded with other raw materials and then granulated could prepare granular products of 2～4.75 mm.The com-pounding performance was good when the proportion of polymerized phosphorus was≥40％.Different phosphorus sources had obvious effects on the granulation performance of composite fertilizers,and the granulation rate,particle strength and dispersibility of the products of Scheme Ⅱ were better than that of Scheme Ⅰ,but the hygroscopicity of Scheme Ⅱ was stron-ger.The appropriate addition amount of APP was conducive to the granulation of composite fertilizers.Both schemes showed that the granulation performance of APP was better than that of Scheme Ⅰ,but the moisture absorption of Scheme Ⅱ was more serious than that of Scheme Ⅰ.The appropriate amount of APP addition is conducive to the granulation of compound fer-tilizer,and both schemes showed that when the proportion of polymerized phosphorus was 20％～40％,the granulation rate of fertilizer products was higher,with Scheme Ⅰ>67％and Scheme Ⅱ>77％.
万方数据
维普
