Pelletizing is a non-pressure (tumble growth) agglomeration method whereby material fines are processed into pellets. It is used throughout a number of industries to transform difficult to handle powders and fines into a more easily handled, and valuable product.
Pelletization involves the tumbling of material fines against each other in the presence of a binding agent. The fines become tacky and stick together, and as they continue to tumble, they pick up more fines and grow (a process known as coalescence).
Pelletizing can be carried out through either a disc pelletizer or agglomeration drum. Disc pelletizers are the most common choice for the pelletization process, with agglomeration drums reserved for more specific applications which require a robust, high capacity solution.
The following chart provides an overview of the disc pelletizing process. In an application using an agglomeration drum, the process is similar, with only the replacement of the disc with the drum.
Many variables affect the success of the end-product and can be adjusted to fine-tune the desired end-product characteristics. Binder formulation, material feed rate, pan angle and more should all be carefully considered.
Pelletizing is a diverse process, and has benefited thousands of materials in a multitude of industries. For a more comprehensive look at pelletizing, download our handbook, or contact a FEECO expert today!
|Download our FREE Agglomeration Handbook|