Introduction to Organic Fertilizer Granulation Technology

Making spherical granular organic fertilizers from coarse powder or irregular small pieces of organic fertilizers obtained through biological fermentation is the key to solving the problem of promoting the use of organic fertilizers in large areas. I will explain to you how to compress and granulate organic fertilizers in the organic fertilizer production line: the coarse powder or irregular small pieces of organic fertilizers after biological fermentation are characterized by high moisture (30-40%), looseness (bulk density 0.3-0.4 t/m3), with a lot of fiber, the existing coarse powder or irregular small pieces of organic fertilizer after biological fermentation are made into spherical particles
There are mainly the following types of organic fertilizer technologies:
1. Some manufacturers use traditional disc or drum granulation, and need to dry coarse powder or irregular small pieces of organic fertilizer (moisture content < 15%) and crush them into very fine powder (greater than 100 mesh) , and then add binder and inorganic fertilizer, and the amount of binder and inorganic fertilizer in the organic fertilizer should not exceed 30%. Although this method can be made into spherical particles, the organic fertilizer in the processing process will be first Sufficient precipitation, crushing, granulation with water, and drying are repeated many times, so the processing cost is quite high, and due to the low density of organic fertilizers, the granule strength is low, which is not conducive to storage, transportation, and machine sowing;
2. There are also some manufacturers who first dry the coarse powder or irregular small pieces of organic fertilizer to a moisture content of only 20-25%, and then use a flat-die extrusion granulator or a counter-roll extrusion granulator to dry the dried Extrude organic fertilizers into columnar or flat spherical particles. Although this method is more convenient to use, the fluidity is not very good, it is not suitable for machine sowing, and the appearance is poor and the appearance is not good;
3. There are also some manufacturers who first extrude coarse powder or irregular small pieces of organic fertilizer into short columnar particles with a flat die extrusion granulator (due to high moisture content and high fiber content, columnar particles also have a certain plasticity), then polish and shape into spherical particles, and then dry, cool and sieve the spherical particles to obtain qualified particles. In this method, the raw materials do not need to be processed, the moisture is reduced in steps, and the production cost is greatly reduced. However, this method also has some fatal problems. The weak point is that the organic fertilizer is easy to arch material, easy to block the material and easy to bond equipment, while the output is small and the power consumption is high during the extrusion process. So to sum up, the organic fertilizer industry urgently needs to introduce a large-capacity, low-energy-consumption compression granulation equipment to overcome the traditional flat-die extrusion granulator that is easy to arch, block, and stick, and has a small output. , and the disadvantage of high power consumption in the extrusion process.