In a countercurrent stage extractor, roasted copper ore containing copper as CuSO4 will be extracted. A charge of 10 tons of gangue, 1.2 tons of copper sulfate, and 0.5 ton of water must be treated per hour. The resulting strong liquor is made up of 90% water and 10% copper sulfate by weight. Copper sulfate recovery is expected to be 98 percent of that in the ore. As a fresh solvent, only pure water should be used. 1 ton of inert gangue maintains 2 tons of water plus copper sulfate dissolved in that water after each step. In each level, equilibrium is achieved. Is there a certain number of phases that must be completed, how many?

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