Then after fertilizer granulation, you will find that there are some fertilizer granules that have a size which is larger or smaller than you require. How to treat them? Discard directly? No, what a waste! You can return them for re-granulation. But before this, you need to grind these unqualified fertilizer particles into powder again by suitable fertilizer crushing machine. In this way, there is nearly no material waste in your fertilizer production process.