Is Sieving Necessary In Pellet Mill Plant?

In the pellet production, the part of raw material particles which are not stuck together to be granulated is called fines. It is internationally recognized that the fine percent of qualified biomass pellets should be lower than 1%. Inadequate pressure inside the pelletizer and insufficient binder is the main causes results in higher percentage of fines. Additionally, if the pellets are not mechanically strong enough, it will easily shatter into fines in the process of delivering or crushing with other pellets. That is to say, the fines percentage of the biomass pellets is an evidence to examine the capability of the pellet machines and the pellet quality.

Generally speaking, the production of fines is unavoidable. If the fines percentage is high or in order to make the pellets look good, there is a step called sieving before cooling in the large-scale pellet mill plant. The newly-made pellets would be placed on a vibrating screen to remove the fines. However, if the pellet mill process the raw material in the correct operation way,the content of fines can be reduced and this step can be skipped. The harder the pellet is, the less fines it result in. How to reduce the fine percentage should be the a key matter each pellets producer should think over.

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