Question: A CuSO4 ore is leached with water in a continuous countercurrent extraction process. The composition of the 200kg/h of ore is: 10% SO4Cu, 5% water

A CuSO4 ore is leached with water in a continuous countercurrent extraction process. The composition of the 200kg/h of ore is: 10% SO4Cu, 5% water and 85% inert gangue. Under operating conditions, it has been found that the retained solution is 1 kg/kg of inerts. Calculate the number of stages and the concentration of the separated solution: a) If 400kg/h of water are used. b) If 800kg/h of water are used.

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