This paper covers the history and implementation of key commercial hydrometallurgical technologies that the authors humbly view as innovative in zinc and lead hydrometallurgy. Breakthrough leaching, purification, separation, concentration and final recovery unit operations are considered. This includes discussions of zinc Roast Leach Electrowinning, pressure oxidation, iron removal and solvent extraction. The Betts process for lead electro refining is also discussed in detail.
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