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electrowinning
electrowinning n. 
/iˌlɛktroʊˈwɪnɪŋ/ Metallurgy the process of extracting a metal from a solution of its salts or from its ore by electrolysis.
Brit. /ᵻˌlɛktrə(ʊ)ˈwɪnɪŋ/
, /ᵻˌlɛktrə(ʊ)ˈwɪnɪŋ/U.S. /əˌlɛktroʊˈwɪnɪŋ/
, /əˌlɛktroʊˈwɪnɪŋ//iˌlɛktroʊˈwɪnɪŋ/ΚΠ
1926 Industr. & Engin. Chem. 18 1030/1 It is the excess electrical energy used in the electrowinning process that must be compared in cost with the fuel used in smelting.
1943 U.S. Patent 2,313,372 1/1 A process for the electroplating, electrorefining, electrowinning and electroforming of lead from anodes containing the same.
1987 R. L. Atkinson Copper & Copper Mining (Shire Album 201) 30/2 Pure copper is now produced in the United States by hydrometallurgy and electrowinning at about one-third of the cost of smelting.
2003 Review (Rio Tinto) June 13/1 Leaching followed by solvent extraction and electrowinning is a relatively cheap route to high purity copper.
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