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Information × Registration Number 0217U000313, 0115U003824 , R & D reports Title Peculiarities of magnetite synthesis from hematite or goethite, localized in iron ore, under the influence of different reducers popup.stage_title Head Grechanovsky Aleksey Evgen'evich, Registration Date 26-01-2017 Organization nstitute of Geochemistry, Mineralogy and Ore Formation popup.description2 Research objects are transformation of weak-magnetic minerals into strongly magnetic magnetite by means of different save energy and save materials methods. The purpose of work is research of nanomagnetite synthesis peculiarities due to transformation of weak-magnetic minerals (hematite or goethite) which situated in oxidized iron ores to strongly magnetic magnetite by means of different save energy and save materials methods, and also development of recommendations, in relation to the increase of iron-ore concentrates production efficiency from the poor oxidized iron ores. Technology of nanomagnetite synthesis was developed. Nanomagnetite synthesis peculiarities are studied under the influence of magnetic-field and ultrasound using the chemical co-precipitation method. With ultrasound applied, the saturation magnetization increases. The processes of iron oxides and iron hydroxides transformation and change of its magnetic characteristics have been studied using method of co-precipitation of ferrous iron and ferric iron salts in an alkaline medium. It was shown that peaks half-width associated with both particles size and structure imperfections. Technology of transformation of hematite and goethite into magnetite in the presence of starch was developed. It is shown that transformation of hematite to magnetite takes place at the temperature range of 400 - 600 °С. High-quality description of transformation mechanism of weak-magnetic hematite and goethite into magnetite has been made. The obtained results can be useful to subsequent creation of magnetite nanoparticles and for development of magnetite production methods from iron ores. Product Description popup.authors Гречанівський Олексій Євгенович Курило Сергій Ігоревич Пономар Віталій Павлович Савченко Тетяна Сергіївна popup.nrat_date 2020-04-02 Close