In the organic fertilizer production line process, the mixing process is often seen as a simple “stirring” step, but this is far from the truth. It is the “central link” connecting raw material pretreatment and granulation, directly determining the uniformity of nutrient distribution in each fertilizer granule.
The primary task of the mixing process is to achieve material homogenization. Organic fertilizer raw materials come from complex sources—composted livestock and poultry manure, crushed straw, various auxiliary materials, and functional additives—each with different specific gravities, particle sizes, and moisture contents. The mission of fertilizer mixing equipment is to fully disperse these differentiated components, ensuring that each batch of material has the same proportions.
For bio-organic fertilizers, the mixing stage is even more significant. The addition of functional microbial agents is usually completed at this stage, and the uniformity of the agent’s distribution in the material directly affects the number of effective viable bacteria in the finished product.
Key Process Control Points
The mixing time needs precise control. Too short a time results in uneven mixing, while too long a time may cause material grading or heat generation, affecting the activity of the microbial agents.
The order of material addition is equally crucial. Typically, the main ingredients are added first and mixed thoroughly before adding trace components or liquid microbial agents, ensuring the additives are fully dispersed and do not clump. For liquid additions, atomized spraying should be used to avoid localized clumping.
On continuous organic fertilizer production lines, an automatic batching system is usually configured in conjunction with the mixer. The feeding speed of each raw material silo is controlled by computer to achieve seamless integration of proportioning and mixing. The mixed material enters a buffer silo, providing a stable and continuous flow for the subsequent granulation process.