electrowinning


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electrowinning

[i¦lek·trō′win·iŋ]
(metallurgy)
Extracting metal from solutions by electrochemical processes.
References in periodicals archive ?
Caption: Figure 2: Experimental setup of electrowinning process.
Hydrometallurgical process development for the production of a zinc sulphate liquor suitable for electrowinning. Miner Eng .
In addition, presence of low iron content in the solution obtained after leaching eliminates the need for the electrowinning process for zinc separation.
CMD manufactured with this process eliminates electrowinning and the need for any mechanical means of size reduction for the final product.
While the technique has various names, such as electrowinning, electrolytic removal/recovery or electroextraction, it all works the same way, by using an electrical current to transform positively charged metal ions (cations) into a stable, solid state where they can be easily separated from the water and removed.
This hydrometallurgical method consists of leaching galena synthetic mixtures or concentrates in waste fluosilicic acid ([H.sub.2] [SiF.sub.6]) with hydrogen peroxide ([H.sub.2] [O.sub.2]) and lead dioxide (Pb[O.sub.2]) as oxidants at 95[degrees], electrowinning the ([PbSiF.sub.6]) solution at 35[degrees] to produce 99,99% Pb metal, and solvent extraction to recover S, leaving a residue containing eventually present Cu, Ag, and other metal values.
The Caserones plant, which is designed to produce 30,000 tonnes of copper cathodes a year, will perform solvent extraction using Outotec's vertical smooth flow (VSF) technology and tank farm, as well as electrowinning using the company's permanent cathode, acid mist capture and stripping technologies.
International Resource News-15 October 2009-Royal Mines installs electrowinning circuit(C)2009 ENPublishing - http://www.enpublishing.co.uk
These tanks are used in copper and zinc refineries, where they are filled with a mild acid for the electrowinning process.