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THE INFLUENCE OF IMPURITIES ON COMPOSITION OF THE PHASES WITH CONTENT OF COPPER, COBALT AND NICKEL IN ORES OF NORILSK TYPE
Abstract
Studies by and X-ray microanalysis and the magnetic methods showed the distribution of impurity elements over the scan area. There were identified phases containing copper, nickel and copper, nickel and cobalt and also the inclusions with a high content of copper and nickel. The concentration of individual elements was varied from sample to sample. There are areas highly enriched by iron and sulfur. The presence of native elements indicates a change of a temperature mode of processes of ore formation. The position of the absorption lines in ordered areas obtained by MпїЅssbauer microscopy, showed the presence of stoichiometric pyrite and chalcopyrite. Some samples of this group have broadened lines, indicating the presence of different positions of iron ions in the sublattices. Intergrowths of chalcopyrite differ according to the degree of imperfection of the structure, which has an impact on the studied parameters. The presence of impurity ions of sulfur and cobalt leads to a change of the thermomagnetic properties of pyrite with increasing temperature, due to the high mobility of these ions. Isomer shifts and quadrupole splitting of the samples change in a wide range. This means that the local electronic structure depends on the genesis of compounds. Thus, most of the mass of copper, nickel and cobalt is not include in the crystal lattice of the ore, and participates in the formation of sulfide compounds. The presence of characteristic structures of disintegration of solid solutions shows a wide range of temperatures of crystallization of the sulphides.
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