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The precipitation of hematite from ferric chloride media at atmospheric pressure

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Abstract

The precipitation of hematite from ferric chloride media at temperatures <100 °C and at ambient pressure was studied as part of a program to recover a marketable iron product from metallurgical processing streams or effluents. Hematite (Fe2O3) can be formed in preference to ferric oxyhydroxides (e.g., β-FeO·OH) at temperatures as low as 60 °C by controlling the precipitation conditions, especially seeding. The hematite product typically contains >66 pct Fe and <1 pct Cl, and its composition does not change appreciably on repeated recycling. The amount of product formed increases significantly with increasing FeCl3 concentrations to ∼0.2 M FeCl3, but nearly constant product yields are obtained thereafter; the precipitates consist only of hematite, provided that an adequate amount of seed is present. The contamination with Zn, Ca, and Na is <0.1 pct, even for high concentrations of dissolved ZnCl2, CaCl2, or NaCl. The extent of the precipitation reaction depends principally on the temperature and the free-acid concentration; accordingly, the controlled addition of a base allows the nearly complete elimination of the iron from metallurgical processing streams or effluents, as readily filterable Fe2O3.

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Authors and Affiliations

  1. the Mining and Mineral Sciences Laboratories, CANMET, Natural Resources Canada, K1A OG1, Ottawa, ON, Canada

    J. E. Dutrizac (Research Scientist) & P. A. Riveros (Research Scientist)

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  1. J. E. Dutrizac
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  2. P. A. Riveros
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Dutrizac, J.E., Riveros, P.A. The precipitation of hematite from ferric chloride media at atmospheric pressure. Metall Mater Trans B 30, 993–1001 (1999). https://doi.org/10.1007/s11663-999-0104-8

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  • DOI: https://doi.org/10.1007/s11663-999-0104-8

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