What are some common fertilizer granulators?

Fertilizer granulators are core equipment in the production of chemical and organic fertilizers. Their function is to process powdery or slurry-like raw materials into granules, improving fertilizer utilization and facilitating storage and transportation. With the modernization of agriculture, the types of granulators are constantly increasing, adapting to different raw materials, production capacities, and fertilizer types. Below are some mainstream types and their characteristics.

The disc granulator is the most widely used traditional equipment, suitable for the production of organic and compound fertilizers. It has a simple structure and low cost. It uses the centrifugal force generated by the rotation of the disc to roll the raw material into granules within the disc, achieving a granulation rate of over 93%. The granules are spherical, and the particle size can be flexibly adjusted. This equipment is easy to operate and maintain, but its output is relatively small, making it more suitable for small and medium-sized enterprises.

The rotory drum granulator is the preferred equipment for compound fertilizer production. It adopts a cylindrical structure and can increase the material temperature by injecting steam, meeting the requirements of the granulation liquid phase, reducing moisture content, and lessening the drying load. Its high output flexibility enables continuous operation, producing high-strength granules suitable for large-scale compound fertilizer and organic-inorganic compound fertilizer production, making it a relatively advanced granulation equipment.

Extrusion granulators are available in two types: roller and flat die. They eliminate the need for drying processes, saving energy and reducing consumption. Roller extrusion granulators use high-pressure extrusion molding, producing no waste, and have wide raw material adaptability, processing various raw materials such as compound fertilizers and organic fertilizers. They offer considerable output and are suitable for large-scale production. Flat die pellet machines produce round and uniform granules with low moisture content and low drying energy consumption, making them suitable for small and medium-sized organic fertilizer processing.

The toothed granulator (also known as a stirring tooth granulator) is a specialized high-efficiency equipment in organic fertilizer production. Its core utilizes a forced mechanical stirring granulation process. With high-speed rotating tooth components, a complex motion space of shearing, tumbling, and kneading is created within a closed cylinder, achieving rapid granulation of materials. Its raw material adaptability is extremely high, especially adept at processing high-fiber, high-moisture materials that are difficult to granulate with conventional equipment, such as fermented straw, mushroom residue, medicinal residue, and municipal sludge. Raw materials with a moisture content of around 30%-40% can be directly granulated without prior drying, significantly reducing energy consumption.

Different granulators have different strengths, and companies need to select the appropriate equipment based on their production scale and raw material type. With the development of smart agriculture, granulators are upgrading towards automation and environmental friendliness, providing strong support for efficient agricultural production.