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The key to the ball-forming rate of NPK fertilizer production line

The key to the ball-forming rate of NPK fertilizer production line:


1. Reasonable mix of fineness of raw materials. The higher the fineness of the material, the better the viscosity, and the higher the surface finish of the granulated particles. However, in the fertilizer manufacturing process, the use of ultra-proportioned high-fineness materials is prone to problems such as excessive particle size, irregular particles, and sticky walls of materials.

2. Reasonable mix of adhesive and dispersive materials. In the production process formula, the proportion of viscous raw materials is high, and it is easy to form balls. The proportion of dispersible raw materials is high, and there are many fine powders.

3. The chemical reaction between materials should be considered when formulating. After the formulation of some materials, free water will be precipitated during the fertilizer manufacturing process, which will cause the liquid phase of the material to exceed the standard and cannot be produced normally. Some materials will greatly reduce the critical relative humidity of the mixed material after being mixed, in the production process, due to a large amount of moisture absorption, Unsuccessful production. Therefore, the chemical reaction between materials must be considered in the formulation to achieve a reasonable mix of materials.

4. The comprehensive water content after the materials is mixed. After the raw materials are integrated, the water content directly affects the granulation. After mixing, some materials are mixed into slurry without adding steam and water during production, resulting in normal production. Therefore, keeping the water content of the materials low is conducive to the addition of steam in the granulation, which is helpful to increase the temperature and viscosity of the materials, thereby improving the compatibility between the materials and the balling rate.

5. Reasonable return amount. The drum steam granulation process does not have the obvious particle classification effect of disc granulation, and the relative pelletization rate in the pelletizer is low. Qualified particles are generally around 55%, so the amount of returned material is higher. The size of the returned material directly affects the yield and quality. The finished product has fewer particles, more flour, and a large amount of returned material, which directly affects the output. Large particles return a lot of materials, which directly affects the smoothness and roundness of the product.

In short, the important principle of rotary steam granulation for the production of compound fertilizers is to minimize the addition of moisture during granulation, and moderately increase the temperature and solubility of the material, so as to reach the goal of reducing thermal energy consumption, improving the balling rate, increasing production, and reducing production costs.