Abstract: The optimum of technological conditions of potassium sulfate crystal by method of ammonia sulfate and slow-releasing in bentonite were studied.The whisker of potassium sulfate is grown after adding the surfactant M. The optimum conditions is :the ratio of (NH_4)_2SO_4∶ KCl=1.1∶ 1; stirring rate:2.0 m/s; stirring time:80 min; pulp density:25 g/100 g; concentration of ethanol:20%. We know that the potassium sulfate is whisker by SEM,EDS and so on.

Key words: bentonite;ammonia sulfate;potassium sulfate;crystal;slow-releasing