Precipitation of silica from zinc process solution

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 lea...

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Bibliographic Details
Published in:Monatshefte für Chemie 2018-02, Vol.149 (2), p.313-321
Main Authors: Vielma, Tuomas, Lassi, Ulla, Salminen, Justin
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemical precipitation
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Energy conservation
Energy consumption
Inorganic Chemistry
Leaching
Organic Chemistry
Original Paper
Physical Chemistry
Silicon dioxide
Solubility
Sulfuric acid
Theoretical and Computational Chemistry
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Summary: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. Graphical abstract
ISSN:0026-9247
1434-4475
DOI:10.1007/s00706-017-2054-1