NPK granulation machines are used for producing NPK fertilizer granules. When investing in NPK fertilizer granulation equipment, the buyer should be aware that there are currently 2 different methods used for granulating fertilizer. This includes the dry and the wet method. It is important to understand how each of these methods work to make an informed choice when it comes to investing in one of these machines.
The dry method used an extrusion force that presses the dry powder to produce pellets. When using a wet drum pelletizer, liquids are added into the raw material that creates adhesive forces for granulating.
The Double Roller Press Machine
This machine is used to produce organic-fertilizer pellets with the use of an extrusion force, which does not require drying processes. These machines are used for manufacturing fertilizer granules that come in various sizes and shapes. During the process of extrusion granulation, the raw materials undergo a process where they are aggregated vigorously under very high pressure. The powder that results from this process is then squeezed between the rollers to produce granules. Since no cooling or drying of the granules is required, the Double Roller Press Machine is the perfect choice for mid and small-sized businesses that are on a budget.
Wet Granulation Processes
Wet granulation produces fertilizers have a moisture content that is higher. The end products require cooling, drying, and a solidifying process. The machine types that are used to produce wet granulation will include a rotary-drum granulator, tower-spray granulation machine, spray-granulation machine, and the disc-pan granulation machine. The liquids that are added to the process of wet granulation have to be volatile and non-toxic. The common additives that are used include ethyl alcohol and isopropanol. The liquids must include a binder to stop the product from separating during the drying processes.
Disc Pan Granulation
The Disc Pan Granulators are a more affordable option when compared to the Rotary Drum Granulators and it can be used for other applications. The disc is made from a robust iron material, which makes it stable and strong. The disc-pan granulators are commonly used in the compound-fertilizer production lines.
The Finishing Processes
After the process of granulation, additional processes are needed in order to complete NPK granules fertilizer production. For example, when wet-granulation machines are used for the production of pellets, cooling and drying processes are required. A separate drying machine will be required for cooling and drying NPK fertilizer granules.
The next phase includes a screening process. During this step, any unqualified pellets will be removed, where they will return to the crushing stage of these production lines. These screeners are available in different types based on the sieving specifications required.
The coating process is what follows on from the screening processes, which provides the granules with a smooth finish along with improving the physical characteristics of the granules. The final phase of these production lines for NPK fertilizer granules making includes packaging the product. To improve the efficiency of production, many businesses have invested in bagging and weighing machines.