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Acidic Dissolution of Magnetite: Experimental Study on the Effects of Acid Concentration and Temperature

Published online by Cambridge University Press:  01 January 2024

Riina Salmimies ,
Marju Mannila ,
Juha Kallas  and
Antti Häkkinen
Riina Salmimies*
Affiliation:
LUT Chemistry, Lappeenranta University of Technology, P.O. Box 20, FI-53851 Lappeenranta, Finland
Marju Mannila
Affiliation:
LUT Chemistry, Lappeenranta University of Technology, P.O. Box 20, FI-53851 Lappeenranta, Finland
Juha Kallas
Affiliation:
LUT Chemistry, Lappeenranta University of Technology, P.O. Box 20, FI-53851 Lappeenranta, Finland
Antti Häkkinen
Affiliation:
LUT Chemistry, Lappeenranta University of Technology, P.O. Box 20, FI-53851 Lappeenranta, Finland
*
* E-mail address of corresponding author: [email protected]
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Abstract

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Magnetite (Fe3O4) is a key economically valuable component in iron ore and is extracted by dissolution processes, but among the Fe (oxyhydr)oxides its solubility behavior is one of the least understood. The objective of this study was to improve understanding of magnetite dissolution mechanisms leading to thermodynamic equilibrium by comparing the dissolution of two solid samples, one synthetic and one industrial, using oxalic, sulfuric, and nitric acids at varying concentrations and temperatures. Of the three solid-liquid systems investigated, only the system consisting of magnetite and oxalic acid reached an equilibrium state within the duration of an individual experiment (6 h). In this system, increasing the acid concentration resulted in a significant increase in the equilibrium concentration of dissolved Fe. When dissolving synthetic and industrial magnetite, increasing the temperature not only increased the rate of reaction but also affected the concentration of dissolved Fe. Significant effects were observed when increasing the temperature from 15 to 35°C, but only slight differences were seen on further increases in temperature. Observations regarding the equilibrium state of the sulfuric and nitric acid systems could not be made because equilibrium was not reached. The most important individual observation regarding the equilibrium state of the nitric- and sulfuric-acid systems seems to be that in future studies a much longer reaction time is necessary, due to slow kinetics of the dissolution mechanism. A proton-based mechanism has been hypothesized as the one governing the dissolution of magnetite by these two acids, but only the dissolution of the industrial sample yielded results that were similar for these two acids and consistent with that hypothesis.

Keywords

DissolutionIron OreMagnetiteOxalic AcidNitric AcidSulfuric AcidParticle SizeTemperature
Type
Article
Information
Clays and Clay Minerals , Volume 59 , Issue 2 , April 2011 , pp. 136 - 146
Copyright
Copyright © The Clay Minerals Society 2011

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