The main content of this dissertation is as follows:
The AN is modified by KF where in the crystal transition temperature of the modified AN is higher than 95 C, but the hygroscopicity and the anti-caking can not be improved. When AN is modified by surfactants the hygroscopicity and the anti-caking ability can be improved. The effect of cation surfactant is better than that of anion, the effect of composite surfactant is the best. When AN is modified by composite surfactants the expanded AN is sens...