Abstract
This paper proposes a straightforward air-aqueous oxidation of St3 steel wastes for mass production of pure ultrafine magnetite. The characterization of the obtained product has been made by X-ray fluorescence analysis, X-ray diffraction, impedance spectroscopy, low-temperature nitrogen absorption method, Mössbauer spectroscopy and optical microscopy. The investigation results have shown high purity of the obtained product, wide range of particle sizes and strongly pronounced magnetic properties
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