Why is the opposite roll extruding granulator often used in NPK fertilizer production line

 In the organic fertilizer machine industry, the applicable raw materials for the production of compound fertilizer by extrusion granulation are more extensive. Roller extrusion granulator has been successfully used for extrusion granulation of more than 20 kinds of materials: urea, ammonium chloride, etc. in nitrogen fertilizers, phosphate fertilizers include ammonium phosphate, ordinary calcium, heavy calcium, phosphate rock, etc. , Potash fertilizer, potassium sulfate, etc., and can add trace elements such as boron, iron, copper, zinc, manganese and so on. In addition, the use of fertilizer extrusion granulation technology can flexibly realize the replacement of product formulas in a very short time, and a set of equipment can produce products with more than 30 formulas.

Because the NPK fertilizer roller press granulator eliminates the drying process, and the returned material after granulation accounts for about 35% of the total feed, the proportion is low. Therefore, the fertilizer extrusion granulation process is simple and the investment is low.

According to IFDC (International Fertilizer Development Center) has carried out detailed research, it is proved that NPK fertilizer extrusion granulator is better than steam granulation, chemical granulation or slurry granulation for a new fertilizer equipment in developing countries. For a NPK fertilizer production equipment with an annual output of 120000 tons, the investment of steam granulation is 19.5% higher than that of extrusion granulation, while the investment of chemical granulation or slurry granulation is 88.8%. In terms of production cost (for 15-15-15) formula, steam granulation is 3% higher and chemical or slurry granulation is 12% higher.