Selective leaching of Mo from an off-grade gravity lead concentrate in Na2CO3 solution

The selective leaching of Mo from an off-grade gravity lead concentrate was investigated in Na2CO3 solution using air as an oxidant. The leaching behaviors of Mo and Pb were predicted by the thermodynamic phase diagrams of Pb-Mo-C-H2O system. The oxidation mechanisms of those sulfides in the off-gra...

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Published in:Journal of mining and metallurgy. Section B, Metallurgy Metallurgy, 2019, Vol.55 (2), p.253-259
Main Authors: Liu, Z.-X., Luo, Y.-T., Luo, W.-B., Li, B.-X., Wu, X.-W.
Format: Article
Language:English
Subjects:
Air flow
air oxidation
Concentrates (ores)
Efficiency
Experiments
Flow velocity
gravity lead concentrate
Leaching
Lead
molybdenite
Molybdenum
na2co3
Oxidation
Oxidizing agents
Phase diagrams
Scanning electron microscopy
selective leaching
Sodium carbonate
Stainless steel
X-ray diffraction
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Summary:The selective leaching of Mo from an off-grade gravity lead concentrate was investigated in Na2CO3 solution using air as an oxidant. The leaching behaviors of Mo and Pb were predicted by the thermodynamic phase diagrams of Pb-Mo-C-H2O system. The oxidation mechanisms of those sulfides in the off-grade gravity lead concentrate were confirmed by the methods of X-ray diffraction (XRD) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDS). The influence of operating factors on the leaching behaviors of Mo and Pb, including Na2CO3 concentration, liquid-to-solid ratio, temperature, and leaching time, were studied. Under these optimum leaching conditions (Na2CO3 2 M, leaching time 8 h, temperature 75?C, air-flow rate 2.0 m3/h and L/S ratio of 10/1 mL/g), the extraction of Mo and Pb was up to 97.70 and 0.73 %, respectively. nema
ISSN:1450-5339
2217-7175
DOI:10.2298/JMMB181128027L