1. The raw materials : chemical fertilzer, organic fertilizer

We can add chemical fertilizer in organic fertilizer, to form a new type fertilizer, it is organic –inorganic compound fertilizer, which can granulate, and also use directly after mixing. Organic materials with harmlessness and stabilizing treatment, it will be crushed and screened after drying, and were taken as the raw materials for processing of organic-inorganic compound fertilizer. Harmless treatment is that the technology to kill the pathogenic bacteria, egg and grass seed and other harmful substance in the organic fertilizer. Stabilizing treatment is that organic component will be decomposed into stable organic matter by biodegradation.

Chemical fertilizers are added in organic fertilizer mainly to improve the contents of various nutrients in fertilizers. Nitrogen fertilizer has urea, ammonium chloride, ammonium sulfate, and so on. Ammonium sulfate is more suitable for organic - inorganic compound fertilizer, which has less volatile loss of fertilizer, powder is easy to mix with organic fertilizer evenly, the effect is better than other forms of nitrogen fertilizer. Phosphorus fertilizer has calcium superphosphate and calcium magnesium phosphate fertilizer, the north area is appropriate to use calcium superphosphate, calcium magnesium phosphate fertilizer and calcium superphosphate could be used in south acid soil. Potash fertilizers mainly include potassium chloride and potassium sulfate, but as for chlorine-free crops such as potatoes, tobacco and watermelon. Potassium chloride is strictly prohibited.

    In addition to the above three planting growth nutrients, some other secondary nutrients and micronutrients cannot be neglected. These elements mainly include boron, manganese, molybdenum, zinc, iron, cobalt, copper, magnesium, calcium, silicon, sulfur and so on. These elements cannot be replaced by other elements in the physiological function of plants. In the whole process of growing plants, they depend on each other, restrict each other and are in a state of balance. Once out of balance, the crops will have physiological diseases to reduce production. It is a great breakthrough of modern agricultural science and technology to increase crop yield by adding appropriate trace elements in compound fertilizer. The high yield and income should owe to the these NPK Fertilizer Production Line, its further research and improvement contribute to the development organic agriculture and life qulity of people.

2. Manufacturing technology of organic-inorganic compound fertilizer

 (1) Crushing process

  If the raw materials (calcium superphosphate, urea, potassium chloride, etc.) without crushing, which has large particles, poor granulation, and uneven blending of fertilizers , will directly affect the quality and appearance of compound fertilizer. Therefore, it must be crushed separately to ensure the particle size of various materials is less than 1mm before granulation. Calcium superphosphate, urea can be crushed by the chain crusher. Urea can be crushed by high speed grinding machine to avoid high temperature, high viscosity of materials and poor crushing effect. Potassium chloride can be crushed by high speed crusher or by chain crusher. The materials after crushing should be screened by vibrating screener. Materials less than 1mm are used for granulation. Materials larger than 1mm are returned to crushing again.

(2) Mixing process

The chemical fertilizer with macro-elements and microelements, organic fertilizer, they are transported into mixing machine according to the planned formula. Here we can use bb-fertilizer mixer or vertical mixer, mixing process must be sufficient, mixed materials is unfavorable placing too long because it is easy to affect by damp. For a mixer with a diameter of 2m, the speed is 24-30r/min is appropriate, and the mixing time is about 30min.

(3) Granulation process

 For better physical properties, we need to further granulate to the mixed materials by rotary drum granulator, at the same time, add the selected adhesive. As a result of the rotation and roll of granulator, material gradually becomes granules. The granules produced by this granulator are smooth and beautiful, but it has high requirements on the fineness of organic materials. Roller press granulator directly extruding materials into finished products, roll extrusion granulation is non drying process, granulated at room temperature and molded at one time. It has the advantages of beautiful appearance, simple operation and low energy consumption.

(4). Drying and cooling process

Drying organic - inorganic compound fertilizer, for better dehydration in the rotary dryer

After drying, particles enter the rotary cooler for cooling.

(5). Packing process

The particles are further separated in the rotary screener, and qualified fertilizer particles will be packed of bags by automatic packing machine into commercial markets, unqualified will be reprocessed.