QUESTION $3$

$3\mathrm{.}1$ What are the advantages of wet grinding over dry grinding

$3\mathrm{.}2$ Kumba Iron Ore Limited, a mining company in South Africa, crushed an Iron ore with a feed that is $80\%$ less than $50\mathrm{.}8mm$ in size and a product size which is $80\%$ less than $6\mathrm{.}35mm.$ The power required is $89\mathrm{.}5kW.$ What will be the power required using the same feed for an $80\%$ less than $3\mathrm{.}18mm$ product? Use the Bond equation.