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We studied the separation and recovery of copper(Ⅱ), nickel(Ⅱ), cobalt(Ⅱ), zinc(Ⅱ), and cadmium(Ⅱ) frommagnesium and calcium, using synergistic solvent extraction (SSX) in a typical hydrometaUurgical waste solu-tion. A mixture of Versatic 10 acid and Mext