Abstract
A scheme of hydrothermal ferritization in the Fe2 +-Cr3+-SO42−-OH-system is proposed. It was established that the residual content of chromium cations in the filtrate is practically independent of the cation ratio, while iron cations increase with increasing K. The dependence between the apparent volume of the precipitate and its magnetic characteristics is determined by the degree of crystallinity of the precipitate and its phase composition. The highest magnetic characteristics correspond to K = 18–20, due to the formation of non-stoichiometric chromites. Effective deposition of Cr(III) cations (about 99%) was achieved over the entire range of cation ratios. The optimal processing time is 60 min at a temperature of 65 °C. The magnetic characteristics of the resulting precipitate correlate with the apparent volume of the precipitate have two extrema corresponding to K = 1 and K = 19. For K = 1, the phase composition corresponds to CrFeO3, K = 19 corresponds to the formation of Cr3−xFexO4 chromite. The results showed that ferritization takes place with a high degree. In this case, the resulting sludge is magnetic, dense, easily separated from the filtrate.
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Frolova, L., Kushnerov, O., Khmelenko, O. (2020). Study of the Producing Ferrite–Chromite by Coprecipitation. In: Fesenko, O., Yatsenko, L. (eds) Nanooptics and Photonics, Nanochemistry and Nanobiotechnology, and Their Applications . Springer Proceedings in Physics, vol 247. Springer, Cham. https://doi.org/10.1007/978-3-030-52268-1_14
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