Hydrolysis electrowinning

Today, hydrometaUurgy is well established as the principal method for extraction of many important industrml metals. Hydrometallurgy for the direct treatment of base metal sulfide concentrates, as a widely used technology, must yet prove itself. The roast-leach electrowinning of zinc is a noteworthy exception and is evolving as standard practice hi the zinc industiy worldwide. Relatively recent developments by way of jarosite and iron oxide hydrolysis and precipitation processes have improved recovery and helped secure zinc hydromemllurgy as standard in the industiy.w... 

On the basis of the mechanism described above, the time-dependence of the effectiveness of polymer additives in practical electrowinning can be discussed by the decomposition, hydrolysis and oxidation into polymers of lower molecular weight. 

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