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The Role of Intermediates in the Process of Red Ferric Pigment Manufacture from FeSO4⋅7H2O

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Abstract

One method of industrial manufacture of red ferric pigments is based on the thermal decomposition of FeSO4⋅7H2O into α-Fe2O3(copperas red). The difficult reproducibility of the color quality of the final pigment is the main problem of this process. One of the factors that can influence the pigment color is contamination by some of the intermediates formed during the transformation process. The identification of two groups of intermediates is the basic result of an extensive laboratory investigation carried out using 57Fe Mössbauer spectroscopy and X-ray powder diffraction (XRD). The first group of intermediates includes sulfato-phases as FeSO4⋅H2O, FeSO4, Fe(OH)SO4, Fe2O(SO4)2, Fe2O(SO4)2⋅xH2O x∈(0,1), and Fe2(SO4)3. Thermally metastable polymorphs of iron(III) oxide, β-Fe2O3, γ-Fe2O3 and ε-Fe2O3, represent the other group. Mössbauer characterization of all intermediate products is given. A significant influence of β-Fe2O3 on the pigment color was found.

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Authors and Affiliations

  1. Departments of Experimental Physics, Inorganic and Physical Chemistry, Palacky University, Svobody 26, 771 46, Olomouc, Czech Republic

    Radek Zboril, Miroslav Mashlan & Dagmar Krausova

  2. Institute of Materials Sciences, NCSR “Demokritos”, Athens, 15310, Greece

    Dimitris Petridis

  3. Research Department, PRECHEZA, 750 62, Prerov, Czech Republic

    Petr Pikal

Authors
  1. Radek Zboril
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  2. Miroslav Mashlan
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  3. Dimitris Petridis
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  4. Dagmar Krausova
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  5. Petr Pikal
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Zboril, R., Mashlan, M., Petridis, D. et al. The Role of Intermediates in the Process of Red Ferric Pigment Manufacture from FeSO4⋅7H2O. Hyperfine Interactions 139, 437–445 (2002). https://doi.org/10.1023/A:1021259432720

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