Industry Info

Comparison of granulation methods of compound fertilizer

In the NPK fertilizer production, there are different granulation methods. Let us take a briefly look.


The most basic is disc granulation. The granulation device is a sloping disc. All the raw materials are mixed and then enter the disc. Then the disc rotates like a rolling element. It depends on the viscous material (the good one or the additive is sticky). Soil,) plus the spray water is rolled into granules and then dried and sieved is the fertilizer. Advantages: the fertilizer granulator machine is simple, hundreds of thousands of things to get, the formula needs to have viscous materials, and there are certain formula restrictions, suitable for low-concentration fertilizer. The production capacity is low, and the daily output is about 100 tons.

The drum is also called rotary drum granulator. The granulation device is a sloping cylinder. Just like a plurality of discs overlap, the granulation efficiency is high. In addition, steam can be used between the materials in the reactor, and a small viscous object can also be used. Due to the filling of water vapor, the granulation efficiency is high. The recipe limits are relatively small. It can also be partially aminated by using partial shotcreting. The ratio of the above two nitrogen fertilizers should not be too high, the nitrogen is higher than 22, and the concentration is more than 40. It is difficult to do because the materials reflect the water and the drying conditions are difficult to reach the standard at the same time.

Spray granulation, spray injection refers to urea spray, which is to melt the urea and spray to reach the compound fertilizer granulator, reduce the urea pulverization process, and save the cost if the urea plant is connected to the urea plant. Fertilizers dissolve quickly, but most of them are high-nitrogen formulas with nitrogen greater than 20. Low nitrogen is not necessary to use urea from the perspective of cost savings. The process conditions should also belong to the drum, the formula with high nitrogen content is low, and the particle shape is good.

The high tower is a high-temperature melting or compounding of the compound fertilizer material, which is thrown from a high altitude, and the surface tension causes a spherical shape when scattered. Screen again. The particles are less likely to agglomerate because they have less moisture during the high temperature process. The material is fully mixed and the particles are crystal clear. Selling is good. However, the reaction materials also need high purity, so the high concentration formula, the urea ratio is relatively high.
In addition: high tower costs are not suitable for frequent replacement of recipes; a lot of materials in a production line process, often changing the formula will result in higher costs.