A method for preparing porous lightweight granules slow release fertilizers

A lightweight porous particles prepared slow release fertilizers, the CRT screen glass frit, 5 to 20% of potassium dihydrogen phosphate, dipotassium hydrogen phosphate, potassium sulfate, tripotassium phosphate, potassium chloride, zinc dihydrogen phosphate, diammonium hydrogen phosphate, ammonium dihydrogen phosphate, manganese oxide, cobalt oxide and mixed, the feed roller kiln 650 ℃ ~ 660 ℃ after the press molding at 780 ~ 790 ℃ incubated at 15 ~ 30min; and then to 100 ~ 200 ℃ / min or less cooling to 50 ~ 80 ℃, light weight porous particles to obtain slow-release fertilizer. Lightweight porous particles prepared slow-release fertilizers of the present invention can be widely used for indoor gardening, urban landscape, green streets, agricultural and other fields. During the preparation process of the present invention is simple, low cost, can reduce the production cost effectively slow release fertilizers, environmental protection, recycling Po, suitable for industrial mass production, with obvious economic and environmental benefits.