Hydrometallurgy definitions

hī'drō-mĕt'l-ûr'jē
The treatment of metal or the separation of metal from ores and ore concentrates by liquid processes, such as leaching, extraction, and precipitation.
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The recovery of metals from ores by a liquid process, as by leaching the ore with an acid.
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The field of extractive metallurgy involving the use of aqueous chemistry for the recovery of metals from ores, concentrates, and recycled or residual materials.
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Origin of hydrometallurgy

hydro- +‎ metallurgy