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Titolo:
Conversion of zinc chloride to zinc sulphate by electrodialysis - a new concept for solving the chloride ion problem in zinc hydrometallurgy
Autore:
Chmielarz, A; Gnot, W;
Indirizzi:
Inst NonFerrous Met, PL-44100 Gliwice, Poland Inst NonFerrous Met Gliwice Poland PL-44100 et, PL-44100 Gliwice, Poland Silesian Univ Technol, Inst Chem Inorgan Technol & Electrochem, PL-44100 Gliwice, Poland Silesian Univ Technol Gliwice Poland PL-44100 , PL-44100 Gliwice, Poland
Titolo Testata:
HYDROMETALLURGY
fascicolo: 1, volume: 61, anno: 2001,
pagine: 21 - 43
SICI:
0304-386X(200106)61:1<21:COZCTZ>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CATION-EXCHANGE MEMBRANES; TRANSPORT-PROPERTIES; ACID;
Keywords:
electrodialysis; chloride ion; zinc hydrometallurgy; zinc sulphate;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Chmielarz, A Inst NonFerrous Met, Sowinskiego 5, PL-44100 Gliwice, Poland Inst NonFerrous Met Sowinskiego 5 Gliwice Poland PL-44100 nd
Citazione:
A. Chmielarz e W. Gnot, "Conversion of zinc chloride to zinc sulphate by electrodialysis - a new concept for solving the chloride ion problem in zinc hydrometallurgy", HYDROMETALL, 61(1), 2001, pp. 21-43

Abstract

The results presented in this paper describe the course and conditions of electrodialytic conversion of zinc chloride to zinc sulphate using mono- and bipolar ion exchange membranes. The object of this work was to find if such a process can be applied to produce zinc sulphate solutions with low concentrations of chloride ions from solutions of zinc sulphate-zinc chloride obtained from raw materials containing high concentration of chloride. As a result of this work, the influence of the technological parameters onthe effectiveness of the process has been determined. The parameters studied include the chemical composition of the working solutions over a wide range of concentrations of individual constituents, the current load of the electrodialytic apparatus, the linear flow velocity of the solution feed, aswell as the character of membranes applied in the apparatus. Empirical equations describing the current efficiency of the process, the increase in concentration of chloride ions in the sulphate solution and the selectivity coefficient of the process have been devised, as a function of four independent variables: the current load of the electrodialytic apparatus, the concentration of zinc as zinc sulphate and zinc chloride in the inlet sulphate-chloride solution and the initial concentration of zinc in the sulphate solution, based on the results of complete factorial experimental technique. Analysing the empirical equations has shown that a one-stage electrodialysis process may be applied to produce zinc sulphate solution, with a low enoughconcentration of chloride ion to meet the requirements of the electrolyticzinc production process, from solutions obtained by leaching zinc-bearing raw materials containing up to 1% concentration of chloride with sulphuric acid. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 16:06:21