Microbial fertilizer is a product made of charcoal, lignite and other organic matter as a carrier, which is granulated after absorbing microbial agents. Its product is characterized by poor high temperature resistance, and the general growth temperature is 20~40°C. When the temperature exceeds 60°C and 80% of the microorganisms are added with the bacterial agent, the temperature of the carrier must be controlled at 50%°C. In addition, in order to prevent the reproduction of miscellaneous bacteria, the carrier should be sterilized bacteria. In other words, the key to the quality of microbial fertilizer products is to control the effective number of viable bacteria in the product, and the selection of the product production process is an important link that affects the effective number of viable bacteria in the product.
The key to the microbial fertilizer production process is the choice of granulation method. Common organic fertilizer granulators on the market include: npk fertilizer granulator, stock transfer granulator, disc granulator machine, new organic fertilizer granulator, new two-in-one organic fertilizer granulator, flat die granulator, ring die granulator, all kinds of granulators have their own production characteristics, and the fertilizer granulator machine price vary.
At present, there are two main granulation methods commonly used for microbial fertilizers (disc granulator machine and extrusion granulation). Since different granulation methods have different requirements on raw materials, the production process will also be different. Through the comparative study of four production processes (disc mixing granulation, extrusion granulation after mixing, spraying bacterial agent after extrusion granulation, and separation granulation), it is known that the production process of microbial fertilizer is best to choose disc separation. Granulation process. Since this process can reduce the impact of chemical fertilizers on microbial agents, the carrier and bacteria are first granulated, stored in an intermediate silo, and then mixed with the granulated particles of the carrier and inorganic fertilizer. The granulation equipment used is generally a roller extrusion granulator. Because the roller extrusion granulator adopts physical extrusion granulation, it will hardly generate mechanical heating, will not affect the biological agent, and has no three wastes, which meets environmental protection requirements.