The Bond work index for grinding the ore in water has been determined to be 14.5 kWh-t. Determine the power requirement to grind the ore given the plant processes 35 kt of the spodumene/quartz ore per year. We now assume the grinding process has perfectly liberated the spodumene. That is, the suspension now consists particles of pure spodumene and pure quartz. Further assume all the particles are spherical with diameter of 90 m. The suspension is in water at 25 C, where the density of water is 0.995 g-cm and the viscosity is 1 mPas.