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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Late News Poster Session
Presentation Title D-37: Lime Sintering of Molybdenite to Produce Molybdenum Without Atmospheric Contamination with SO2
Author(s) Rafael Padilla, Tihare Neira, Oscar Jerez
On-Site Speaker (Planned) Rafael Padilla
Abstract Scope Lime sintering of molybdenite in nitrogen atmospheres was investigated to determine the phase changes that occur in nitrogen sintering at 700-1000 oC using molar ratios MoS2/CaO = 1/3. Experimental results indicated that temperature was the most influential variable in the sintering process. The XRD analysis showed that the products at 900 oC and 120 min were Mo, CaMO4, and CaS. The overall reaction can be written as 3 MoS2 (s)+8 CaO(s)=Mo(s)+2 CaMoO4 (s)+6 CaS(s), which indicates that CaO fixes efficiently S as a solid CaS eliminating noxious SO2 production. Therefore, separation of solid Mo and CaMoO4 from CaS in the products can be done by acid/basic leaching of the molybdate and physical separation of the molybdenum from the CaS. Thus, this novel alternative process for molybdenum production from molybdenite is straightforward as compared to the conventional complex technology (Roasting-Calcine Purification-Hydrogen Reduction) to produce molybdenum or commercial molybdenum species.
Proceedings Inclusion? Undecided
Keywords Extraction and Processing, Phase Transformations, Pyrometallurgy

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