Grinding spices is breaking and crushing dried species into a powdered form. Here, depending on the type of spice, the particle sizes can be adjusted. Grinding or milling spices is quite challenging due to temperature changes or explosion risks. Specifically for the explosion risk, you can employ cryogenic spice grinding technology with conditioned air, minimizing the loss of volatile oils in the spices. Often high-impact or fine-impact mills or hammer mills are utilized for this process.