Advertisement

Electrode process of diethyldithiocarbamate on surface of pyrrhotite

  • Li Wei-zhong 
  • Qin Wen-qing Email author
  • Qiu Guan-zhou 
  • Dong Qing-hai 
Article
  • 41 Downloads

Abstract

The electrode process of diethyldithiocarbamate on the surface of pyrrhotite was studied using systematic electrochemical analysis, including cyclic voltammetry, chronopotentiometry and galvanostatic. Experimental results show that tetraethylthioram disulphide (TETD) is electrodeposited on pyrrhotite electrode surface in the presence of 1.0×10−4 mol/L diethyldithiocarbamate when the electrode potential is higher than 0.25 V. The electrochemical kinetics parameters of the electrode process of diethyldithiocarbamate on surface of pyrrhotite are calculated as follows: the exchange current density is 2.48 µA/cm2, and the transmission coefficient is 0.46. The electrodeposition includes two steps electrochemical reaction. The first reaction is electrochemical adsorption of diethyldithiocarbamate ion, then the adsorbed ion associates with a diethyldithiocarbamate ion from the solution and forms tetraethylthioram disulphide on the surface of pyrrhotite.

Key words

electrode process pyrrhotite diethyldithiocarbamate 

CLC number

TD923 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    Song S, Lopez-Valdivieso A, Ojeda-Escamilla M C. Electrophoretic mobility study of the adsorption of alkyl xanthate ions on galena and sphalerite[J]. Journal of Colloid and Interface Science, 2001, 237(1): 70–75.CrossRefGoogle Scholar
  2. [2]
    Grano S R, Prestidge C A, Ralston J. Sulphite modification of galena surfaces and its effect on flotation and xanthate adsorption[J]. International Journal of Mineral Processing, 1997, 52(1): 1–29.CrossRefGoogle Scholar
  3. [3]
    Chmielewski T, Lekki J. Electrochemical investigation on adsorption of potassium ethyl xanthate on galena [J]. Minerals Engineering, 1989, 2(3): 387–391.CrossRefGoogle Scholar
  4. [4]
    Herrera-Urbina R, Sotillo F J, Fuerstenau D W. Effect of sodium of sodium sulfide additions on the pulp potential and amyl xanthate flotation of cerussite and galena[J]. International Journal of Mineral Processing, 1999, 54(3): 157–170.CrossRefGoogle Scholar
  5. [5]
    Ndzebet E, Schuhmann D, Vanel P. Study of the impedance of a galena electrode under conditions similar to those used in sulphide mineral flotation—I. Electrode oxidation and xanthate adsorption[J]. Electrochimica Acta, 1994, 39 (5): 745–753.CrossRefGoogle Scholar
  6. [6]
    Chermyshova I. Anodic processes on a galena (PbS) electrode in the presence of n-butyl xanthate studied FTIR-spectroelectrochemically[J]. Journal of Physical Chemistry B, 2001, 105(34): 8185–8191.CrossRefGoogle Scholar
  7. [7]
    HU Qing-chun, WANG Dian-zuo, LI Bai-dan. Electrochemical investigation of the diethyldithiocarbamategalena flotation system[J]. International Journal of Mineral Processing, 1992, 47(4): 289–305.CrossRefGoogle Scholar
  8. [8]
    WANG Dian-zuo, GU Guo-hua, LIU Ru-yi. Potential adjustment flotation of galena-lime-diethyldithiocarbamate system [J]. Chinese Journal of Nonferrous Metals, 1998, 8(2): 322–326. (in Chinese)Google Scholar
  9. [9]
    LI Quan, QIU Guan-zhou, QIN Wen-qing, et al. Kinetics of electrochemical process of pyrite electrode in diethyldithiocarbamate solution[J]. Mining and Metallurgical Engineering, 2001, 21(2): 30–33. (in Chinese)Google Scholar
  10. [10]
    Bhaskar R G, Forsling W. Adsorption mechanism of diethyldithiocarbamate on covellite, cuprite and tenorite[J]. Colloids and Surfaces, 1991, 60(26): 53–69.Google Scholar
  11. [11]
    QIN Wen-qing, QIU Guan-zhou, HU Yue-hua, et al. Dynamics of electrodeposition of tetraethylthioram disulphide (TETD) on pyrite surface[J]. Journal of Central South University of Technology(English Edition), 2001, 8(3): 164–168.CrossRefGoogle Scholar
  12. [12]
    Hamilton C, Woods R. An investigate of surface oxidation of pyrite and pyrrhotite by linear potential sweep voltammetry[J]. Journal of Electroanalytical Chemistry, 1981,118:327–343.CrossRefGoogle Scholar
  13. [13]
    Valli M, Persson I. A vibration and X-ray photoelectron spectroscopic study of the interaction between chalcopyrite, marcasite, pentlandite, pyrrhotite and troilite, and ethylxanthate and decylxanthate ions in aqueous solution[J]. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 1994, 83(3): 207–217.CrossRefGoogle Scholar

Copyright information

© Central South University 2005

Authors and Affiliations

  • Li Wei-zhong 
    • 1
  • Qin Wen-qing 
    • 1
    Email author
  • Qiu Guan-zhou 
    • 1
  • Dong Qing-hai 
    • 2
  1. 1.School of Resources Processing and BioengineeringCentral South UniversityChangshaChina
  2. 2.General Research Institute for Nonferrous MetalsBeijingChina

Personalised recommendations