Mj. Rahman et al., STUDIES ON THE EFFECTS OF SOME ADDITIVES ON THE PHYSICOMECHANICAL PROPERTIES OF UREA AMMONIUM-SULFATE (UAS) PELLETS, Fertilizer research, 38(2), 1994, pp. 89-93
The effects of some additives on the process of pressing mixed fertili
zer based on Urea and Ammonium Sulphate (UAS) at a ratio of 4:1 and th
eir impact on the kinetics of solubility were investigated. UAS pellet
s were produced using a laboratory pressing machine at an optimum pres
sure. Most of the inorganic salts with hydrated water gave better crus
hing strength and lower rates of dissolution as compared with UAS pell
ets without additives. The organic compound tall pech - a by-product o
f pulp production - acts as a better binding agent for UAS pellets in
respect of both strength and solubility. It is assumed that except for
hydrated inorganic salts the tall pech possesses the property of bein
g a slow-release binder in the mixed UAS fertilizer.