Electrochemical way of molybdenum extraction from the Bimetallic systems of Mo-W

4th Global Conference on Materials Science and Engineering

Kudreeva, L.K.^1 ; Nauryzbaev, M.K.^1 ; Kurbatov, A.P.^1 ; Kamysbaev, D.H.^1 ; Adilbekova, A.O.^1 ; Mukataeva, Z.S.^1

Department of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty

050040, Kazakhstan^1

关键词: Anodic dissolution;    Bimetallic systems;    Dissolution process;    Electrochemical dissolution;    Electrode surfaces;    Molybdenum and tungsten;    Oxidation currents;    Polarization curves;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/103/1/012044/pdf
DOI  :  10.1088/1757-899X/103/1/012044

来源: IOP

【 摘 要 】

Electrochemical dissolution of molybdenum and tungsten was investigated in waterdimethylsulfoxide (DMSO) media at different concentrations of lithium chloride and magnesium perchlorate. The terms of efficient extraction of molybdenum from bimetallic systems of Mo-W have been determined. The polarization curves of the electrooxidation of molybdenum in the solution of 0.25 M LiCl in the DMSO at the different rates of rotations and the scan rate equal to 50 mV/s were obtained. In the presence of the addition of water at the potential of 0.1-0.75 V the small area of polarizability occurs, then with increasing potentials above 1.5 V there is a sharp increase of the oxidation current. Comparison of the current values of anodic dissolution of molybdenum and tungsten showed that the rate of anodic dissolution of molybdenum significantly exceeds the rate of anodic dissolution of tungsten. In the case of molybdenum, the dissolution process is limited by diffusion, in the case of tungsten - by the passive film formation on the electrode surface.