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Electrodialysis recovery with Cu,[link widoczny dla zalogowanych], Fe, Ni sulfate in sulfuric acid solution

yhaeenmeasured. Sulphuricacidcanberecoveredefficientlybyelectr0 a dialysisforacidconcentrationsfrom10to200g/Iandmetalconcentrationsf continued on page l02) l02 Zhu Chengdu Branch of I994 in six AReviewofMathematicalModellingofGasExchangeinMembraneArtificialLungsPeiJueminTanXiaoph,[link widoczny dla zalogowanych], gABSTRACTAnintroductionandreviewofmathematicalmodellingandtheprogressoftheoreticalstudyofmembraneartificiallungshaeenpresented. Themajorexistingmathematicalmodelsofthegasexchangehavebeenclassified. Thegeneralassumptionsforthemodellinghavebeensummedup. Moredetailedcommentsonvarietyofthegasexchangemodelsinshell-and-tubeandcross-flowmembranelungshavebeengiven-Thefurtherdevelopmentandinvestiga-lionofmembranelungtheorieshaeenpointed0ut. KeyWords: membraneartificiallung,[link widoczny dla zalogowanych], gasexchange,[link widoczny dla zalogowanych], shell-and-tubecrogg-flow,[link widoczny dla zalogowanych], mathematicalmodel on the next page 79) 4to5Og / I. DuringtheelectrodialysisprocessasmalIamountofmetalistrans-portedwiththeacidintoproductstream. TheleveJofcontaminati0nisintheorderCu>> Fe> Ni. Thisagreeswellwiththeobservedorderofmembrafieelec-triealresistances: Cu <Fe <Ni. Itwasfoundthatacidtransferemciencvislargelyindependentofthetypeofmetalioninthedialysate, andtransfereffi-ciencyismoststronglyeffeetedbytheinitiaIacidconcentrationandcurrentdensity. Theenergyconsumptionincreaseswithincreasingcurrentdensity, butisunaffectedbyincreasingacidconcentrationinthedialysate. Theapplicationofcommercialeleetrodialysersforacidrecoveryisdiscussed. KeyWordsmembraneseparationprocess, ionexchangemembrane, elec-tmdialysis, acidsolutionscontainingCu, Fe & Ni. sulphurieacidrecovery

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