ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Recovery of Molybdenum from Spent Lubricant
Tran Van LongTakahiro MikiYasushi SasakiMitsutaka Hino
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2012 Volume 52 Issue 7 Pages 1217-1224


The recovery of Mo from spent lubricant by applying carbothermic reduction was investigated. The carbothermic reduction of CaCO3–MoS2–C, CaCO3–MoS2–Fe2O3–C and the spent lubricant–CaCO3–Fe3O4–C mixtures at 1073 K, 1173 K, 1273 K, 1373 K and 1473 K were carried out to investigate the reduction mechanism of MoS2 under various conditions. The reduction process was anlayzed by using quadruple mass spectroscopy (QMS) analysis, differential thermal analysis (DTA) and X-ray diffraction (XRD) analysis. Based on the investigated reaction mechanism, the carbothermic reduction of the spent lubricant–CaCO3–Fe3O4–C mixtures at 1773 K was carried out to confirm the feasibility of the Mo recovery from the spent lubricant. Mo in the spent lubricant was found to be fully recovered as molten Fe–Mo alloy by the reaction, MoS2(s) + 2CaO(s) + 2C(s) → 2CaS(s) + 2CO(g) + Mo. The recovered Fe–Mo alloy contained about 40 mass% Mo and 4.3 mass% C. Thus, Mo recovery from the spent lubricant by carbothermic molten reduction is promising.

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© 2012 by The Iron and Steel Institute of Japan
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