Abstract
We established that the phase composition of oxide molybdenum concentrate is re presented mainly by MoO3, as well as МоО2, WO3, Mo2C and associated ore impurities of Al2O3, CaO, SiO2 and MgO. We found non-uniform microstructure in the form of plates, granules of round shape, and thread-like formations. It was determined that phase composition of metallized molybdenum concentrate, obtained by carbon-thermal technique, is mostly composed of metal Mo with the presence of MoC and Mo2C. Unrestored component is represented by the oxy-carbide compound (Mo, O, C) and the lower molybdenum oxide MoO2. We noted fragmented presence of Mo8O23. Spongy microstructure revealed areas where the molybdenum oxide restoration products dominate. The presence of residual oxygen confirms the existence, along with metal Mo, of unrestored oxide or oxy-carbide compounds. The residual oxygen could also be contained in the oxide compounds of Si, Al, Ca, Mg, K, Na as associated ore impurities. This is confirmed by discovery of the specified elements in the examined areas. The detected phases and compounds do not display significant susceptibility to sublimation. High restorative ability, due to the excess of carbon in the form of carbides, provides the post-restoration of oxide component in the liquid metal in the process of alloying, as well as protection against secondary oxidation
Highlights
At present, indicators of energy- and material consumption of the final product in metallurgy are the basic ones during comprehensive planning of production output [1]
Authors of article [10] have studied thermodynamics and kinetics of restoration in the system Мо–О–С and Са–Мо–О–С, which matches the processes of carbon-thermal treatment of oxide molybdenum concentrate
They, in contrast to pure oxides of Mo, contain associated oxide ore impurities of Ca, Si, Al, Mg and others. They can significantly affect the flow of processes of metallization, the phase composition and microstructure of recovered products
Summary
Indicators of energy- and material consumption of the final product in metallurgy are the basic ones during comprehensive planning of production output [1]. These trends have manifested themselves in the metallurgy of rare metals and related alloying materials. Traditional technologies (carbosilicon- and alumothermal smelting) for obtaining alloying metals based on Mo are transformed into modern methods of powder metallurgy and are further developed [3, 4]. Applied physics sublimation of oxides, when processing and employing the ore and technogenic molybdenum-containing materials in steelmaking. Strategic direction in solving this problem is to develop understanding of the mechanism of restoration of oxide molybdenum-containing raw materials
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