ROUND GRANULE POTASSIUM SULFATE COMPOSITE MATERIAL AND PREPARATION METHOD AND APPLICATION THEREOF

The present invention provides a round granule potassium sulfate composite material and a preparation method and an application thereof, and belongs to the technical field of fertilizer production. According to the present invention, a first granular material (potassium sulfate granules, 1 - 2 mm) is prepared by utilizing a stirring granulator or a double-shaft granulator in a closed environment as a nuclear core for two-step granulation. Then the two-step granulation is performed. The granules are amplified to 2 - 4 mm, with the product yield over 80 percent, which is well above the product yield of 50 percent by means of a conventional agglomeration process. The granules feature low moisture and high strength. By means of the combined granulation method, the present invention achieves an effect of rapidly granulating potassium sulfate.