But why is it the opposite in the experiment that i made? I think it has something to do with the rate of feeding the material into the jaw crusher. I don't think the power should be investigated but the energy. Because indeed, there is greater energy requirement to reduce a material into smaller size.Can anyone comment about this? Or do you have other explanation?
Greater energy is indeed required to reduce a material to a smaller size, since you need to supply the energy required for the solid to fail. Now power is energy per unit time, so if you are having the same feed rate, power increases along with the energy as material is reduced to a smaller size. But usually for a crusher, to produce a finer size of particle, it requires more time. If it is correct in your case then certainly the energy per unit time (power) will come down from what it should be for the specified size of particle. The difference in this power will depend upon the type of material and the kind of crusher you are using. If you have to have power requirement as your base for experimentation, you could vary the rate of feed in such a way that, it will be taking same time to process same mass at different size requirement (give lower amount of material when size requirement for output is large)
