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Electric-oxidation extraction of molybdenite concentrate in alkaline NaCl electrolyte

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Abstract

The dissolution of molybdenite concentrate in NaCl electrolyte was investigated. The results show that the dissolution rate increases with the increase in liquid-to-solid ratio, stirring speed, NaCl concentration and temperature. When the liquid-to-solid ratio is 30:1, stirring speed is 400 r/min, concentration of NaCl is 4 mol/L at pH=9 and room temperature, the leaching efficiency of molybdenite concentrate will reach 99.5% in 240 min. Molybdenite concentrate cannot be electro-oxidized directly on the anode. The kinetic studies show that the dissolution of molybdenite concentrate is represented by shrinking core model with diffusion through a porous product layer of element sulfur, and the apparent activation energy for the dissolution reaction is 8.56 kJ/mol.

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Correspondence to Hong Zhong  (钟宏).

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Foundation item: Project(2007BAB22B01) supported by the 11th Five-Year Plan of National Science and Technology of China; Project(50704036) supported by the National Natural Science Foundation of China

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Cao, Zf., Zhong, H., Liu, Gy. et al. Electric-oxidation extraction of molybdenite concentrate in alkaline NaCl electrolyte. J. Cent. South Univ. Technol. 17, 480–484 (2010). https://doi.org/10.1007/s11771-010-0510-8

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  • DOI: https://doi.org/10.1007/s11771-010-0510-8

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