The Kinetics of copper cementation onto zinc Raschig rings in a rotating packed bed cylindrical reactors have been studied. The effect of initial concentration of copper ions, packed cylinder rotation speed and diameter of zinc Raschig rings on the rate of cementation has been investigated. The influence of zinc packing geometry (Raschig rings and cylinders), the presence of surfactant (Triton X-100) and sand particles in the solution were also studied. The rate of cementation was found to increase with increasing cylinder rotation speed raised to a power of 0.947 and solid to liquid ratio. The rate decreases with increasing the initial copper ions concentration and the diameter of zinc Raschig rings. The rate of cementation was inhibited in solutions containing Triton X-100. Raschig rings were found to increase the rate of cementation more than cylinders. The present reactor proved to be more efficient than the traditional solid rotating cylinder reactor for cementation reactions in view of its high area per unit volume and its high rate of mass transfer. The present data can be correlated in terms of the mass transfer coefficient of cementation by the equation: Sh = 0.0005 Re-0.947 Sc-0.33. For the conditions 13900 < Re < 70500, 2056 < Sc < 2202.