Determining the patterns of phase and structural transformations at carbonthermal reduction of molybdenum concentrate
DOI:
https://doi.org/10.15587/1729-4061.2018.127306Keywords:
molybdenum concentrate, carbothermal reduction, phase analysis, microscopic study, carbide formation, alloyingAbstract
We have studied patterns in the influence of O/C in the charge on the content of C, O2, and Mo in metallized molybdenum concentrate after different temperatures of thermal treatment. it was determined that O/C at 1.75‒2.00 in the charge after treatment at 1,223–1,423 K provides for the content of Mo in metallized molybdenum concentrate at 74.6–78.0 % by weight. The content of C and O2 was 0.5–2.0 % by weight, and 0.6–5.5 % by weight, respectively. At O/C in the charge at 2.50, the products of reduction after heat treatment at 1,323 K consisted of Mo and MoO2. The residual molybdenum-containing oxide component is due to the insufficient amount of a reducing agent. The presence in the phase composition of carbide Mo2C together with Mo was found at O/C in the charge at 1.33, indicating a certain excess of the carbon reducing agent. The most favorable conditions for reduction were ensured at O/C in the charge at the level of 1.83 with a transition of most of the oxides to the metal phase of Mo. We have obtained a spongy structure of the metallized product, which ensures an increased rate of dissolving the obtained molybdenum-containing additive in a liquid metal at alloying. We did not identify in the phase composition any compounds susceptible to sublimation, which predetermines a reduction in the losses of Mo when using an alloying additive.
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Copyright (c) 2018 Stanislav Hryhoriev, Artem Petryshchev, Ganna Shyshkanova, Tetyana Zaytseva, Oleksandr Frydman, Yuliya Petrusha, Andrey Andreev, Alexander Katschan, Mykola Lazutkin, Nina Sinyaeva
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