University of Oulu

Vielma, T., Lassi, U. & Salminen, J. Monatsh Chem (2018) 149: 313.

Precipitation of silica from zinc process solution

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Author: Vielma, Tuomas1; Lassi, Ulla1; Salminen, Justin2
Organizations: 1Research Unit of Sustainable Chemistry, University of Oulu, Oulu, Finland
2Boliden Kokkola, Kokkola, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Springer Nature, 2018
Publish Date: 2019-11-27


Precipitation of silica in concentrated sulfuric acid solutions was studied with laboratory-scale batch experiments. The effects of initial silicic acid concentration, temperature, and sulfuric acid concentration were studied. It was observed also in this work that the high ionic strength of the leaching solution drastically decreased the solubility of silica. The solubility was also studied using Gibbs energy minimization method and Pitzer model using the ChemSheet program. Good agreement was obtained between the model and experimental results. The precipitation reaction of silica was observed to follow a pseudo-first-order rate law. Based on the rate law used, an activation energy of 61.7 kJ mol⁻¹ was estimated. This implies a reaction-controlled mechanism of precipitation.

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Series: Monatshefte für Chemie/Chemical Monthly
ISSN: 0026-9247
ISSN-E: 1434-4475
ISSN-L: 0026-9247
Volume: 149
Issue: 2
Pages: 313 - 321
DOI: 10.1007/s00706-017-2054-1
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: Boliden Kokkola and AdChem (Tekes, 1792/31/2016) Project are gratefully acknowledged for research funding.
Copyright information: © Springer-Verlag GmbH Austria 2017. This is a post-peer-review, pre-copyedit version of an article published in Monatshefte fur chemie. The final authenticated version is available online at: