... φ3.9×(30+1.2)m dryer for NPK compound fertilizer plantTechnical parameters1.inner diameter of shell: φ3.9m2.length of ... , crushing equipment, environmental protection equipment, cooling equipment, drying equipment, compound fertilizer equipment, packing machine, chemical equipment and electrical control system. Most ... to contact us. 3.9x31.2 dryer for NPK compound fertilizer plant