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Patterns of transformation of the crystal structure and magnetic characteristics of iron oxides and hydroxides under the influence of external factors

ABSTRACT

 

Report on the SRW: 150 pages, 68 figures, 14 tables, 87 sources

The objects of research are the transformation of weakly magnetic iron oxides and hydroxides into strongly magnetic magnetite under the influence of reducing agents and temperature.

The purpose of the work is to clarify the patterns of transformations of the crystal structure and magnetic properties of natural and synthetic magnetically ordered iron-containing minerals under the influence of external factors (reducing agents, temperature, solutions).

As a result of the work performed, the transformation of the structure and magnetic properties of natural and synthetic hematite and goethite under the influence of temperature, reducing agents and a solution of iron salts was investigated. It was shown that in the presence of carbohydrates, carbon monoxide, and siderite, weakly magnetic hematite and goethite transforms into strongly magnetic magnetite. It is shown that heating siderite and a mixture of siderite and hematite leads to the formation of magnetite without the addition of any reducing agent. It was also established that incubation of goethite and hematite in an aqueous solution of iron salts leads to their partial transformation into magnetite. In addition, the composition and properties of the samples before and after the transformations were determined by the methods of X-ray structural analysis, magnetometry, thermomagnetic analysis and scanning electron microscopy. The obtained results can be used in solving problems related to the production of iron ore concentrates from poor oxidized iron ores.

 

Authors:

Ponomar Vitalii Pavlovych

Antonenko (Savchenko) Tetiana Serhiivna

Other authors:

Keywords:

hematite, goetite, magnetite, redox transformation, x-ray structural analysis, magnetometry

Head of the research:

Ponomar Vitalii Pavlovych

Registration Card (RC):

0117U006213

Execution period of the research:

2017 - 2018