Abstract
In zinc hydrometallurgy, hot-acidic leaching of calcines leads to Fe/Zn solutions in sulfuric acid medium. Three distinct processes have been previously developed to remove iron: jarosite, goethite and hematite. Each process displays their own drawbacks: important loss of zinc (jarosite, goethite), significant environmental impact of residue (jarosite) or economic cost (hematite). The work reported herein investigated the possibility of using phytic acid, a compound extractable from cereals, to remove iron. Precipitation was studied first at the laboratory-scale using DOE methodology and then with a laboratory pilot. At pH = 2.1, we showed that it is possible to remove up to 99.5% of iron with a loss of zinc equal to 0.6% and a residual concentration of FeIII of 130 mg L−1. Even if the amount of residue is more important than in the jarosite process, leaching tests showed that iron phytate could be stored in less drastic conditions than jarosite.
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Some facilities used in the work have been funded through the SusChemProc project, with the joint French Ministry of Research and Region Lorraine CPER program (2015–2020).
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Comel, J., Meux, E., Leclerc, N. et al. Use of Phytic Acid for the Removal of Iron in Hot Acidic Leachate from Zinc Hydrometallurgy. JOM 73, 1652–1660 (2021). https://doi.org/10.1007/s11837-021-04640-y
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DOI: https://doi.org/10.1007/s11837-021-04640-y