Process characteristics of extrusion granulation type organic fertilizer production line
（1） The granular organic fertilizer production line can produce “spherical” pure organic fertilizer, organic-inorganic fertilizer and bio-organic fertilizer by using the new process of extrusion granulation and polishing. The process flow is short, the operating cost is low, the produced organic fertilizer particles are uniform and round, the surface is smooth, the compressive strength is high, the fluidity is good, the survival rate of microorganism is more than 90%, the granulation rate is 85-95%, and the particle diameter is 3.5-4 mm.
（2） The new process of extrusion granulation and polishing and shaping has strong adaptability to raw materials, which can completely solve the key technical problems that are difficult to be solved by traditional granulation processes such as disc granulation machine or drum granulation machine:
- The fermented organic materials can be directly used for granulation without drying and crushing in the early stage. Traditional granulation processes such as disc or drum have high requirements on the fineness of raw materials, that is, more than 80% of the materials should have a fineness of more than 80 mesh, so it is necessary to crush them. Because the organic