University of Oulu

T. Vielma, J. Salminen, U. Lassi, Thermodynamics of the ZnSO4-H2SO4-H2O system, Calphad, Volume 60, 2018, Pages 126-133, ISSN 0364-5916,

Thermodynamics of the ZnSO₄-H₂SO₄-H₂O system

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Author: Vielma, T.1; Salminen, J.2; Lassi, U.1
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, P. O. Box 3000, 90014 Oulu, Finland
2Boliden Kokkola Oy, Sinkkiaukio 1, 67200 Kokkola, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.1 MB)
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Language: English
Published: Elsevier, 2018
Publish Date: 2019-12-29


Internally consistent set of thermodynamic parameters was derived for the binary ZnSO₄–H₂O -system using the CALPHAD method. Available data on water activity, EMF measurements, solubility and heat of solution and dilution measurements was reviewed. Additional parameters for the ternary ZnSO₄–H₂SO₄–H₂O system were derived based on the available solubility and boiling point data. Solubility of zinc sulfate was predicted successfully under conditions relevant in hydrometallurgical processing of zinc, and even up to 15 mol kg−1 sulfuric acid solutions. Temperature dependent Pitzer parameters for the binary and ternary systems are reported.

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Series: CALPHAD. Computer coupling of phase diagrams and thermochemistry
ISSN: 0364-5916
ISSN-E: 1873-2984
ISSN-L: 0364-5916
Volume: 60
Pages: 126 - 133
DOI: 10.1016/j.calphad.2017.12.006
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: Tekes/Adchem project is acknowledged for financial support.
Copyright information: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license