ON the kinetics of Cu, As and Sb transport through cation and anion exchange membranes in acidic electrolytes

J. P. Ibánez, L. Cifuentes

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Experiments were conducted in a batch electrodialysis cell containing aqueous acidic solutions of copper, arsenic and antimony in order to evaluate their transport kinetics through commercial ion exchange membranes. A relatively high unwanted transport of bisulfate through the cation exchange membrane was observed with the transport rate being 0.39 mol/h/m2at 225 A/m2. The bisulfate transport rate through the anion exchange membrane was found to be 1.05 mol/h/m2 at the same current density. The transport rate for the unwanted transfer of copper ions through the anion exchange membrane varied linearly with time and current density; the transport rates were 0.07 and 0.10 mol/h/m2at 150 and 225 A/m2, respectively. These values were found to be lower than 1/7 of the transport rate of copper for both current densities, through the cation exchange membrane. Arsenic transport was found to be highly dependent on speciation. In a 1.5 mol/L H2SO4solution, As(III) was transported as AsO+ with a rate of 0.02 mol/h/m2 at 225 A/m2and As(V) was transported as H2AsO4- with a rate of 0.01 mol/h/m2 in 0.5 mol/L of acid. At pH 2.8, the transport of As(V) increased tenfold to about 0.1 mol/h/m2. Antimony was transported through both anion and cation membranes at 2.7 and 3.4 mmol/h/m2, respectively. The transported cation is likely to be Sb(OH)2+or SbO+ while the transported anions could be Sb(HSO4)mn--type species. © Canadian Institute of Mining, Metallurgy and Petroleum.
Original languageEnglish
Pages (from-to)439-448
Number of pages10
JournalCanadian Metallurgical Quarterly
Publication statusPublished - 1 Jan 2004
Externally publishedYes

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