Свойства нанокристаллических магнитных порошков системы Fe – O, полученных магнито-импульсной обработкой из железорудной пыли

Abstract

The influence of the parameters of high-energy, thermal and magnetic-pulse processing on the formation of the phase composition and magnetic properties of nanocrystalline powders of the Fe – O system during their production from cheap problematic iron ore raw materials “blue dust” of the Indian deposit has been studied. The research results showed that the GR-1 concentrate “blue dust” in its properties refers to waste, and not to natural ore material. The presence of an oxide-salt layer on the surface of the particles and the high dispersion of the material do not allow it to be used in its pure form as a feedstock for blast-furnace production, and the development of a processing method requires a separate approach. From the analysis of the results of measuring the magnetic properties, it follows that as a result of the processing of iron ore material in a high-energy planetary ball mill, it was possible to obtain samples with properties characteristic of hard magnetic materials. The particle size is 1 µm and the values of the coercive force and remanent magnetization are 190 Oe and 0.5 kG, respectively. This makes it possible to recommend the use of this magnetic material as fillers for polymer films. The conditions of thermal and magnetic treatment are determined, which make it possible to increase the values of the coercive force by 27 – 35 % and the remanent magnetization by 1.9 – 2.6 times.