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Regulations of the synthesis of magnetite from hematite or goetite, located in iron ores, under the influence of different reducers

ABSTRACT

 

Report on the SRW: 64 pages, 25 figures, 10 tables, 26 sources

The objects of research are the transformation of weakly magnetic minerals into strongly magnetic magnetite using various energy- and material-saving methods.

The purpose of the work is to study the laws of synthesis of nanosized magnetite due to the transformation of weakly magnetic minerals (hematite or goethite), which are part of oxidized iron ores, into strongly magnetic magnetite using various energy- and material-saving methods, as well as the development of recommendations for increasing the efficiency of iron ore production concentrates from poor oxidized iron ores.

The technology was developed and the patterns of synthesis of nanosized magnetite under the influence of a magnetic field and ultrasound by the method of chemical co-precipitation were investigated. It was shown that applying ultrasonic vibrations to the reaction mixture leads to an increase in the saturation magnetization of the samples. The transformation processes of iron oxides and hydroxides and the change in their magnetic characteristics during the chemical co-precipitation of divalent and trivalent iron in an alkaline medium were also investigated. It was shown that the width of the X-ray diffraction peaks can be determined both by the size of the grains and by the imperfection of the crystal lattice. A technology has been developed to transform hematite and goethite contained in the ore, as well as their synthetic analogues, into magnetite in the presence of starch. It was shown that in the temperature range of 400 – 600 °С, the transformation of the crystal lattice of hematite into the crystal lattice of magnetite occurs. A qualitative description of the mechanism of transformation of weakly magnetic hematite and goethite into strongly magnetic magnetite is given. The obtained results may be useful for the further creation of magnetite nanoparticles and for the development of methods for obtaining magnetite from iron ores.

Authors:

Kurylo Serhii Ihorovych

Ponomar Vitalii Pavlovych

Savchenko Tetiana Serhiivna

Other authors:

Keywords:

iron-containing minerals, phase transformations, nanomagnetite, X-ray phase analysis, thermomagnetic studies

Head of the research:

Hrechanivskyi Oleksii Yevhenovych

Registration Card (RC):

0115U003824

Execution period of the research:

2015 - 2016