Removal of Copper from Dilute Solutionsby Cementation on Zinc in Baffled Batch-Agitated Vessels

A. A. Mubarak

Abstract
Rates of Cu++ removal from waste solution by cementation on zinc in a baffled-agitated vessel, lined with a cylindrical zinc sheet, were studied under different conditions of impeller rotation speed, initial copper concentration, temperature and time of cementation. It was found that the rate of Cu++ removal increases with increasing impeller rotation speed, initial concentration, temperature and residence time at pH 4. The cementation rate temperature dependence was found to be of Arrhenius type with an activation energy of 23 J mol–1 confirming the diffusion controlled nature of the reaction. Mass transfer study of the process has revealed that the data for the conditions: 57 628 < Re < 485550 and 638 < Sc < 1697 fit the following dimensionless equation: Sh = 0.035Re0.89 Sc0.33

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Keywords
wastewater, cementation, copper removal, mass transfer, agitated vessels