Manufacturing and processing equipment for sulfur-coated urea and controlled-release fertilizer
Sulfur coating technology is a kind of microcrystalline polymer material with sulfur and paraffin as main raw materials on the basis of large granule urea, so as to achieve slow controlled release of nitrogen nutrients. Sulfur coated urea should meet the following three indicators: 1. The content of N was 31 / 34 / 35 / 37. 2. Under the condition of 38 ℃ still water and constant temperature, 10%, 15%, 20% and 25% of total nitrogen content were released in 24 hours. 3. 60% - 70% of total nitrogen was released in seven days. The key technology of sulfur coated urea coating can be used in NPK fertilizer granulation, drum granulation and other slow and controlled-release fertilizers, realize curtain coating granulation of various solid granular fertilizers, and produce various slow and controlled-release fertilizers such as super granular urea, sulfur coated compound fertilizer, lignosulfonate urea, humic acid urea and water-soluble resin. The coated controlled-release fertilizer ...