The study of physicalchemical patterns of resourcesaving recycling of tungstencontaining ore raw materials by solidphase reduction
DOI:
https://doi.org/10.15587/1729-4061.2018.122743Keywords:
tungsten concentrate, carbothermic reduction, metallization, sublimation, phase analysis, microstructure, resource savingAbstract
It was determined that the oxidic tungsten concentrate is represented basically by CaWO4. Other phases have a fragmentary manifestation with a low intensity of the corresponding diffraction peaks. Microstructure is heterogeneous, disordered. Particles with presence of the accompanying ore impurities (molybdenum, calcium, silicon, iron, aluminum, fluorine and carbon) were found. The metallized tungsten concentrate after heat treatment at 1,250 K had a reduction degree of 21 % with a prevalence of CaWO4 in the phase composition. An increase in temperature to 1,350 K and 1,450 K provided a reduction degree of 69 % and 87 %, respectively. Under these conditions, a significant predominance of WC and W2C carbides was found in the phase composition. The presence of CaWO4 was of a residual nature with a relatively low intensity of manifestation. The microstructure of metallized tungsten concentrate was inhomogeneous with the presence of particles of various sizes and chemical compositions. As the reduction temperature increased, manifestation of the processes of sintering of particles was observed, especially clearly after treatment at 1,350 K and 1,450 KReferences
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Copyright (c) 2018 Stanislav Hryhoriev, Artem Petryshchev, Olga Sergienko, Dmitry Milko, Alexander Stepanenko, Gennadii Kozhemiakin, Yevheniia Manidina, Nataliia Berenda, Vadim Ryzhkov, Oksana Shcherbyna
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