The feed flowrate is $250\mathrm{.}0\frac{t}{h}$ solids, and contains no moisture. The rod mill specification requires a product of $55\%$ solids by volume, and the ball mill requires $45\%$ solids by volume. The density of the solids is $3\mathrm{.}2\frac{t}{m^3}.$ The circulating load is $400\%.$ The cyclone overflow is designed at $36\mathrm{.}5\%$ solids by mass, and the solids concentration in the cyclone underflow is $80\mathrm{.}0\%$ solids by mass. Use the krebs model to select the proper size and number of cyclones for a rod mill $/$ ball mill assuming that pressure drop is $60$Kpa $(50)$

Figure $1$ communition flow rate