Changes of Magnetic Characteristics of iron Oxides and Hydroxides in Aqueous Medium
UDC (549.5.517.2 + 549.521.51 + 549.731.13) : 539.26
https://doi.org/10.15407/mineraljournal.39.01.046
SAVCHENKO T.S., GRECHANOVSKY A.E., BRIK A.B., DUDCHENKO N.O.
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Av., Kyiv-142, Ukraine, 03680
E-mail: tetyana_savchenko@ukr.net
Language: Ukrainian
Mineralogical journal 2017, 39 (1): 46-52
Abstract:
The investigation of changes of magnetic properties and structure of magnetically ordered iron oxides and hydroxides and ways of their production are in the focus of attention during last years. The work objective is to investigate the processes of formation of iron oxides and hydroxides and change of their magnetic characteristics that occur in aqueous medium. The processes of iron oxides and hydroxides transformation and changing of their magnetic properties during chemical coprecipitation of two- and trivalent iron in alkaline medium were studied. Seven samples with different ratio x = Fe3+/Fe2+ (0 (sample 1), 0.1 (sample 2), 0.2 (sample 3), 0.5 (sample 4), 2 (sample 5), 5 (sample 6), 10 (sample 7)) were synthesized. Phase composition of synthesized samples was determined by X-ray diffraction (XRD ). Magnetic characteristics of obtained samples were determined using magnetometry method. It was shown, that the size of synthesized particles was in the range of 9—30 nm and saturation magnetization varies from 19 to 65 A · m2/kg. Synthesized samples consist mainly of magnetite. It was shown that the amount of nanomagnetite almost does not increase after х > 2. Secondary mineral is hematite or some amorphous part. It was established that with increasing the content of Fe3+ (at x from 0 to 5), the half-width of diffraction lines increases. This indicates that the size of magnetite particles decreases. The appearance of broad peaks (especially for sample 6) is also associated with the formation of generally amorphous sample with certain amount of magnetite. A significant decrease of half-width peaks for the sample 7 (Fe3+/Fe2+ = 10) is associated with the presence of a separate phase of hematite in it. Obtained data can be used to develop effective technologies for iron ore enrichment.
Keywords: phase transformations, magnetite, X-ray diffraction, magnetometry.
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